AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
1
ChargePump
TM
General Description
The AAT3132/32A is a low noise, constant frequen-
cy charge pump DC/DC converter that uses frac-
tional (1.5X) conversion to maximize efficiency for
white LED applications. The device can be used to
produce current levels up to 20mA in three of its out-
puts and up to 25 or 30mA in one of its outputs to
drive LEDs from a 2.7V to 5.5V input. Outputs may
be operated individually or paralleled for driving
higher-current LEDs. A low external parts count
(two 1F flying capacitors and two small 1F capac-
itors at V
IN
and OUT) makes the AAT3132/32A ide-
ally suited for small battery-powered applications.
AnalogicTech's Simple Serial ControlTM (S
2
CwireTM)
interface is used to enable, disable, and set the LED
drive current in two groups: the three 20mA outputs
and the single 30mA output with multiple level loga-
rithmic scales. The AAT3132/32A has a thermal
management system to protect the device in the
event of a short-circuit condition at the output pin.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. A high charge pump switch-
ing frequency enables the use of very small external
capacitors. A low-current shutdown feature discon-
nects the load from V
IN
and reduces quiescent cur-
rent to less than 1A. The device also integrates a
test current/auto-disable feature for each channel.
The AAT3132/32A is available in the very small, Pb-
free, 12-pin TSOPJW package.
Features
V
IN
Range: 2.7V to 5.5V
<1.0A of Shutdown Current
1MHz Switching Frequency
White LED Backlighting
Fully Independent Display Lighting
Drives Low-V
F
and High-V
F
Type LEDs
Up to Three 20mA Outputs
Single 25mA Output (AAT3132-1)
Single 30mA Output (AAT3132/32A)
Multi-Position Logarithmic Scale with Digital
Control
Low Noise Constant Frequency Operation
Regulated Output Current
Automatic Soft Start
No Inductors
-40C to +85C Temperature Range
12-Pin TSOPJW Package
Applications
Color (RGB) Lighting
Programmable Current Source
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
C
IN
1
F
V
BATTERY
C
OUT
1
F
EN/SET
C1
1
F
C2
1
F
D5
D3
D2
D1
VIN
VOUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3132
D4
Pin Descriptions
Pin Configuration
TSOPJW-12
(Top View)
1
2
3
4
5
6
12
11
10
9
8
7
C2+
OUT
C1-
C1+
D3
D2
C2-
GND
IN
EN/SET
D1
D4
Pin #
Symbol
Function
1
C2+
Flying capacitor 2 positive terminal. Connect a 1F capacitor between C2+
and C2-.
2
OUT
Charge pump output. Requires 1F capacitor connected between this pin and
ground.
3
C1-
Flying capacitor 1 negative terminal.
4
C1+
Flying capacitor 1 positive terminal. Connect a 1F capacitor between C1+
and C1-.
5
D3
Current source output #3.
6
D2
Current source output #2.
7
D4
Current source output #4.
8
D1
Current source output #1.
9
EN/SET
Control pin.
10
IN
Input power supply. Requires 1F capacitor connected between this pin and
ground.
11
GND
Ground.
12
C2-
Flying capacitor 2 negative terminal.
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
2
3132.2005.12.1.4
Absolute Maximum Ratings
1
Thermal Information
3
Symbol
Description
Value
Units
JA
Thermal Resistance
160
C/W
P
D
Maximum Power Dissipation (T
A
= 25C)
4
625
mW
Symbol
Description
Value
Units
V
IN
Input Voltage
-0.3 to 6
V
V
OUT
Charge Pump Output
-0.3 to 6
V
V
EN/SET
EN/SET to GND Voltage
-0.3 to 6
V
V
EN/SET(MAX)
Maximum EN/SET to Input Voltage
V
IN
- 0.3
V
I
OUT
2
Maximum DC Output Current
150
mA
T
J
Operating Junction Temperature Range
-40 to 150
C
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
3
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Based on long-term current density limitation.
3. Mounted on an FR4 board.
4. Derate 6.25mW/C above 25C.
Electrical Characteristics
1
V
IN
= 3.5V, C
IN
= C
OUT
= C
1
= C
2
= 1.0F; T
A
= -40C to +85C, unless otherwise noted.
Typical values are T
A
= 25C.
Symbol
Description
Conditions
Min
Typ
Max
Units
Input Power Supply
V
IN
Operation Range
2.7
5.5
V
I
CC
Operating Current
3.0
V
IN
5.5, Active,
1.8
3.5
mA
No Load Current
I
SHDN
Shutdown Current
EN = 0
1.0
A
I
DX
Maximum Output Current D1 to D3
3.0
V
IN
5.5
18
20
22
mA
I
DX
Maximum Output Current D4
T
A
= 25C AAT3132-1
22.5
25
27.5
mA
T
A
= 25C AAT3132
27
30
33
I
(D-Match)
Current Matching Between
VD1:D3 = 3.6, V
IN
= 3.3V
0.5
%
Any Two Outputs
CP
Charge Pump Section Efficiency
V
IN
= 3.5V, I
OUT(TOTAL)
= 90mA,
93
%
Measured from IN to OUT
Charge Pump Section
T
SS
Soft-Start Time
200
s
F
CLK
Clock Frequency
1000
kHz
EN/SET
V
EN(L)
Enable Threshold Low
0.5
V
V
EN(H)
Enable Threshold High
1.4
V
T
EN/SET LO
EN/SET Low Time
V
EN/SET
< 0.5
0.3
75
s
T
EN/SET HI
Minimum EN/SET High Time
V
EN/SET
> 1.4
50
ns
T
OFF
EN/SET Off Timeout
V
EN/SET
< 0.5
500
s
Input Current EN/SET Input Leakage
-1
1
A
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
4
3132.2005.12.1.4
1. The AAT3132/32A is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is
assured by design, characterization, and correlation with statistical process controls.
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
5
Typical Characteristics
Unless otherwise noted, V
IN
= 3.5V, C
IN
= C
OUT
= C
1
= C
2
= 1F, T
A
= 25C.
80mA Load Characteristics
Time (1s/div)
20mV/div
V
IN
OUT
V
DIODE
Turn-Off
Time (200s/div)
ENSET
(1V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
Turn-On to Full-Scale Load Switch
Time (50s/div)
ENSET
(1V/div)
OUT
(2V/div)
V
DIODE
(2V/div)
I
IN
(100mA/div)
Turn-On to Full-Scale Charge Pump
Time (50s/div)
ENSET
(1V/div)
OUT
(2V/div)
V
DIODE
(1V/div)
I
IN
(200mA/div)
V
IH
and V
IL
vs. V
IN
0.600
0.625
0.650
0.675
0.700
0.725
0.750
0.775
0.800
0.825
0.850
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
V
IH
V
IL
I
DIODE
vs. Input Voltage
(4x20mA)
40
45
50
55
60
65
70
75
80
85
90
2.7 2.9
3.1 3.3
3.5
3.7
3.9
4.1 4.3
4.5
4.7 4.9
5.1
Input Voltage (V)
I
DIODE
(mA)
V
DIODE
= 3.3V
V
DIODE
= 3.4V V
DIODE
= 3.5V
V
DIODE
= 3.6V
Typical Characteristics
Unless otherwise noted, V
IN
= 3.5V, C
IN
= C
OUT
= C
1
= C
2
= 1F, T
A
= 25C.
I
DIODE
vs. Temperature
-7.00
-6.00
-5.00
-4.00
-3.00
-2.00
-1.00
0.00
1.00
2.00
-50
-30
-10
10
30
50
70
90
110
Temperature (
C)
Output Current Change (%)
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
6
3132.2005.12.1.4
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
7
Functional Block Diagram
1.5X
Charge
Pump
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
Quad
Output
DAC
Single
Output
DAC
Current
Reference
S
2
Cwire
Interface
32x16 bit
ROM
C1+
C1-
C2+
C2-
OUT
D1
D2
D3
D4
GND
EN/SET
VIN
32x16 bit
ROM
Functional Description
The AAT3132/32A is a high efficiency (1.5X) frac-
tional charge pump device intended for white LED
backlight applications. It consists of a 1.5X charge
pump with multiple current source outputs. To max-
imize power conversion efficiency, an internal feed-
back control sensing circuit monitors the voltage
required on the constant current source outputs.
The AAT3132/32A requires only four external
components: two 1F ceramic capacitors for the
charge pump flying capacitors (C
1
and C
2
), one
1F ceramic input capacitor (C
IN
), and one
0.33F to 1F ceramic output capacitor (C
OUT
).
The 1.5X charge pump output is converted into
three (D1 to D3) constant current outputs to drive
three individual LEDs with a maximum current of
20mA each, and one (D4) constant current output
with a maximum current of 25 or 30mA. The cur-
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
8
3132.2005.12.1.4
rent source output magnitude is controlled by the
EN/SET serial data interface. The interface
records rising edges of the EN/SET pin and
decodes them into 32 addresses corresponding to
individual current level settings. The 32 address-
es are divided up such that outputs D1 to D3 can
be controlled independently of output D4. For
Addresses 1 to 8, 9 to 16, 17 to 24, and 25 to 32,
outputs D1 to D3 start at 0mA and increase from
0.5mA to 20mA in three 8dB steps and three
2.5dB steps. Output D4 remains constant over
these address ranges which provides orthogonal
control of the two channels. For Addresses 1 to 8,
D4 is set to 0mA. For Addresses 9 to 16, D4 is set
to the next brightness setting; likewise for
Addresses 17 to 24 and Addresses 25 to 32. This
is summarized in Table 1 and Figure 1.
The modulo 32 interface wraps back to State 1
after the 32nd clock. With each EN/SET pulse,
the output current changes to the next setting in
the address decoding. To change settings to the
previous address decoding, 31 EN/SET clock
pulses are required. The counter can be clocked
at speeds up to 1MHz, so intermediate states are
not visible. The first rising edge of EN/SET
enables the IC and initially sets the output LED
currents 0mA. Additional clocks are required to
set the desired current level. Once the final clock
cycle is input for the desired brightness level, the
EN/SET pin is held high to maintain the device
output current at the programmed level. The
device is disabled 500s after the EN/SET pin
transitions to a logic low state.
Figure 1: Output Current Level Settings (Option AAT3132).
0
5
10
15
20
25
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Address Code
Current (mA)
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
9
Table 1: Constant Current Source Output Programming Levels.
Current Level Settings (mA)
Address
D1 to D3
D4 (AAT3132/32A)
D4 (AAT3132-1)
1
0.0
0.0
0.0
2
0.5
0.0
0.0
3
1.3
0.0
0.0
4
3.3
0.0
0.0
5
8.3
0.0
0.0
6
11.1
0.0
0.0
7
15.0
0.0
0.0
8
20.0
0.0
0.0
9
0.0
1.0
15.0
10
0.5
1.0
15.0
11
1.3
1.0
15.0
12
3.3
1.0
15.0
13
8.3
1.0
15.0
14
11.1
1.0
15.0
15
15.0
1.0
15.0
16
20.0
1.0
15.0
17
0.0
15.0
20.0
18
0.5
15.0
20.0
19
1.3
15.0
20.0
20
3.3
15.0
20.0
21
8.3
15.0
20.0
22
11.1
15.0
20.0
23
15.0
15.0
20.0
24
20.0
15.0
20.0
25
0.0
30.0
25.0
26
0.5
30.0
25.0
27
1.3
30.0
25.0
28
3.3
30.0
25.0
29
8.3
30.0
25.0
30
11.1
30.0
25.0
31
15.0
30.0
25.0
32
20.0
30.0
25.0
Applications Information
Constant Current Output Level Settings
The constant current source output amplitude for
outputs D1 to D3 and D4 are set via the serial inter-
face according to a logarithmic scale depicted in
Figure 1. Using a logarithmic scale, LED bright-
ness appears linear with each increasing code
count. Because the outputs D1 to D4 are true
independent constant current sources, the voltage
observed on any single given output will be deter-
mined by the actual forward voltage (V
F
) for the
LED being driven.
Since the output current of the AAT3132/32A is
programmable through its S
2
Cwire interface, no
PWM (pulse width modulation) or additional control
circuitry are needed to control LED brightness. This
feature greatly reduces the burden on a microcon-
troller or system IC to manage LED or display
brightness, allowing the user to "set it and forget it."
Furthermore, with its high-speed serial interface
(1MHz data rate), the output current of the
AAT3132/32A can changed successively to bright-
en or dim LEDs in smooth transitions (e.g., to fade
out) or in abrupt steps, giving the user complete
programmability and real-time control of LED
brightness.
EN/SET Serial Interface (S
2
Cwire)
The current source output magnitude is controlled
by the EN/SET serial data interface. The interface
records rising edges of the EN/SET pin and
decodes them into 32 individual current level set-
tings, as summarized in Table 1. The modulo 32
interface wraps back to State 1 after the 32nd
clock, so the previous state is achieved by clocking
the EN/SET pin 31 times. The counter can be
clocked at speeds up to 1MHz, so that intermediate
states are not visible. The first rising edge of
EN/SET enables the IC and initially sets the output
LED current to 0. Once the final clock cycle is input
for the desired brightness level, the EN/SET pin is
held high to maintain the device output current at
the programmed level. The device is disabled
500s after the EN/SET pin transitions to a logic
low state. The EN/SET timing is designed to
accommodate a wide range of data rates. After the
first rising edge of EN/SET, the charge pump is
enabled and reaches full capacity after the soft-
start time (T
SS
). During the soft-start time, multiple
clock pulses may be entered on the EN/SET pin to
set the final output current level with a single burst
of clocks. Alternatively, the EN/SET clock pulses
may be entered one at a time to gradually increase
LED brightness over any desired time period. A
constant current is sourced as long as EN/SET
remains in a logic high state. The current source
outputs are switched off after EN/SET has
remained in a low state for at least the T
OFF
timeout
period.
LED Selection
The AAT3132/32A is specifically intended for driving
white LEDs. However, the device design will allow
the AAT3132/32A to drive most types of LEDs with
forward voltage specifications ranging from 2.0V to
4.3V. LED applications may include main and sub-
LCD display backlighting, camera photo-flash appli-
cations, color (RGB) LEDs, infrared (IR) diodes for
remotes, and other loads benefiting from a controlled
output current generated from a varying input volt-
age. Since the D1 to D4 output current sources are
matched with negligible voltage dependence, the
LED brightness will be matched regardless of the
specific LED forward voltage (V
F
) levels.
In some instances (e.g., in high luminous output
applications such as photo flash), it may be neces-
sary to drive high-V
F
type LEDs. The low dropout
current sources in the AAT3132/32A make it capa-
ble of driving LEDs with forward voltages as high
as 4.3V at full current from an input supply as low
as 3.0V. Outputs can be paralleled to drive high
current LEDs without complication.
Device Switching Noise Performance
The AAT3132/32A operates at a fixed frequency of
approximately 1MHz to control noise and limit har-
monics that can interfere with the RF operation of
cellular telephone handsets or other communica-
tion devices. Back-injected noise appearing on the
input pin of the charge pump is 20mV peak-to-
peak, typically ten times less than inductor-based
DC/DC boost converter white LED backlight solu-
tions. The AAT3132/32A soft-start feature prevents
noise transient effects associated with inrush cur-
rents during start-up of the charge pump circuit.
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
10
3132.2005.12.1.4
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
11
Power Efficiency and Device
Evaluation
The charge pump efficiency discussion in the fol-
lowing sections only accounts for efficiency of the
charge pump section itself. Due to the unique circuit
architecture and design of the AAT3132/32A, it is
very difficult to measure efficiency in terms of a per-
cent value comparing input power over output
power.
Since the AAT3132/32A outputs are pure constant
current sources and typically drive individual loads, it
is difficult to measure the output voltage for a given
output (D1 to D4) to derive an overall output power
measurement. For any given application, white LED
forward voltage levels can differ, yet the output drive
current will be maintained as a constant.
This makes quantifying output power a difficult task
when taken in the context of comparing to other white
LED driver circuit topologies. A better way to quantify
total device efficiency is to observe the total input
power to the device for a given LED current drive
level. The best white LED driver for a given applica-
tion should be based on trade-offs of size, external
components count, reliability, operating range, and
total energy usage...not just % efficiency.
The AAT3132/32A efficiency may be quantified
under very specific conditions and is dependent
upon the input voltage versus the output voltage
seen across the loads applied to outputs D1
through D4 for a given constant current setting.
The efficiency (
) can be simply defined as a linear
voltage regulator with an effective output voltage
that is equal to one and one half times the input
voltage. Efficiency (
) for an ideal 1.5X charge
pump can typically be expressed as the output
power divided by the input power.
In addition, with an ideal 1.5X charge pump, the
output current may be expressed as 2/3 of the
input current. The expression to define the ideal
efficiency (
) can be rewritten as:
-or-
For a charge pump with an output of 5V and a nom-
inal input of 3.5V, the theoretical efficiency is 95%.
Due to internal switching losses and IC quiescent
current consumption, the actual efficiency can be
measured at 93%. These figures are in close agree-
ment for output load conditions from 1mA to 100mA.
Efficiency will decrease as load current drops below
0.05mA or when level of V
IN
approaches V
OUT
.
Refer to the Typical Characteristics section of this
datasheet for measured plots of efficiency versus
input voltage and output load current for the given
charge pump output voltage options.
Capacitor Selection
Careful selection of the four external capacitors
C
IN
, C
1
, C
2
, and C
OUT
is important because they will
affect turn-on time, output ripple, and transient per-
formance. Optimum performance will be obtained
when low equivalent series resistance (ESR)
(%) = 100
V
OUT
1.5V
IN
=
P
OUT
=
V
OUT
I
OUT
=
V
OUT
P
IN
V
IN
1.5I
OUT
1.5V
IN
=
P
OUT
P
IN
EN/SET Timing Diagram
EN/SET
Code
1
2
3
OFF
OFF
t
HI
t
LO
t
OFF
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
12
3132.2005.12.1.4
ceramic capacitors are used. In general, low ESR
may be defined as less than 100m
. A value of
1F for all four capacitors is a good starting point
when choosing capacitors. If the LED current
sources are only programmed for light current lev-
els, then the capacitor size may be decreased.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3132/32A. Ceramic capacitors offer
many advantages over their tantalum and alu-
minum electrolytic counterparts. A ceramic capac-
itor typically has very low ESR, is lowest cost, has
a smaller PCB footprint, and is non-polarized. Low
ESR ceramic capacitors help to maximize charge
pump transient response. Since ceramic capaci-
tors are non-polarized, they are not prone to incor-
rect connection damage.
Equivalent Series Resistance
ESR is an important characteristic to consider when
selecting a capacitor. ESR is a resistance internal
to a capacitor that is caused by the leads, internal
connections, size or area, material composition,
and ambient temperature. Capacitor ESR is typi-
cally measured in milliohms for ceramic capacitors
and can range to more than several ohms for tanta-
lum or aluminum electrolytic capacitors.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1F are typically
made from NPO or C0G materials. NPO and C0G
materials have tight tolerance and are stable over
temperature. Large capacitor values are typically
composed of X7R, X5R, Z5U, or Y5V dielectric
materials. Large ceramic capacitors, greater than
2.2F, are often available in low-cost Y5V and Z5U
dielectrics, but capacitors greater than 1F are
usually not required for AAT3132/32A applications.
Capacitor area is another contributor to ESR.
Capacitors that are physically large will have a lower
ESR when compared to an equivalent material
smaller capacitor. These larger devices can improve
circuit transient response when compared to an
equal value capacitor in a smaller package size.
Test Current/Channel Disable
Each channel of the output is equipped with test cur-
rent function. A small amount of current (~2A) is
injected into each output current source to detect the
presence of load (LED). Unused channels that are
tied to ground or LED load fail short will be automat-
ically disabled instead of wasting the programmed
output current. The test current in the AAT3132A is
higher (~150A) to accommodate LEDs with lower
impedance in failure mode.
Thermal Protection
The AAT3132/32A has a thermal protection circuit
that will shut down the charge pump if the die tem-
perature rises above the thermal limit, as is the
case during a short-circuit of the OUT pin.
Driving Multiple LEDs, White LED
Display Module Backlights, and
Individual LEDs Connected in Parallel
The AAT3132/32A D1 to D4 outputs are true con-
stant current sources capable of driving up to 20mA
(D1 to D3) or 25/30mA (D4) each over the operation
input voltage range. Since these outputs are true
constant current sources, they may be connected in
parallel to drive a single power output. Any combina-
tion of outputs (D1 to D4) may be connected in par-
allel. The maximum total output current is a sum of
how many current sources are parallel connected.
This feature is particularly useful to power pre-man-
ufactured display modules which are pre-wired with
white LED backlights connected in a parallel circuit
configuration. Any combination of outputs may be
connected in parallel to drive groups of LEDs. The
AAT3132/32A internal current source reference cir-
cuit bases feedback from current sensed on the D1
and D4 outputs. For best operation, the only require-
ment for this type of application is the outputs D1 and
D4 should always be connected to the load circuit.
The AAT3132/32A may be used to drive multiple
LEDs having differing forward voltages. Using
feedback techniques, the current in D1 to D3 is ref-
erenced to the current in the LED connected to D1.
Current source output D4 is its own reference. If all
LEDs are of similar type, the diodes will be
matched in current, maintaining uniform LED
brightness despite variations in manufacturer, pro-
duction, etc.
However, if the diodes are dramatically different in
type comprising a mix of high-V
F
type and low-V
F
type LEDs, the AAT3132/32A has the capability to
optimally drive up to four LEDs of one type and up
to two LEDs of another type simultaneously. This
feature can be useful for driving different color
LEDs, driving both display backlight and photo-
flash LEDs, or for driving main and sub-LCD dis-
play LED backlights from a single charge pump IC.
For example, when driving independent RGB
LEDs, the green and blue LEDs typically require a
high V
F
to operate (e.g., 3.7V), while the red LED
needs a low forward voltage (e.g., 2V). By con-
necting the green and blue diodes to outputs D1 to
D3 and the red diodes to D4, good control and uni-
formity in brightness is maintained despite the 2V
difference in the diode forward voltages.
Similarly, if a 4V photo-flash LED array is connect-
ed to outputs D1 through D3 (with the outputs short-
ed together) and two 3.3V sub-LCD display back-
light LEDs are connected to output D4, then the
AAT3132/32A can optimally drive each set of LEDs
at the programmed current level (see Figure 2).
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4
13
Figure 2: AAT3132/32A Driving Two Groups of Paralleled White LEDs
(e.g., main and sub-LCD backlights).
C
IN
1
F
V
BATTERY
C
OUT
1
F
EN/SET
C1
1
F
C2
1
F
D2
D3
D4
D5
VIN
VOUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3132
AAT3132A
D1
D6
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
14
3132.2005.12.1.4
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,
or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold
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trol techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
Ordering Information
Package Information
TSOPJW-12
All dimensions in millimeters.
0.20 + 0.10
- 0.05
0.055
0.045
0.45
0.15
7
NOM
4
4
3.00
0.10
2.40
0.10
2.85
0.20
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
0.15
0.05
0.9625
0.0375
1.00
+ 0.10
-
0.065
0.04 REF
0.010
2.75
0.25
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means
semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package
Marking
1
Part Number (Tape and Reel)
2
TSOPJW-12
JAXYY
AAT3132ITP-T1
TSOPJW-12
KHXYY
AAT3132ITP-1-T1
TSOPJW-12
OJXYY
AAT3132AITP-1-T1
PDF 
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