LP2966
Dual 150mA Ultra Low-Dropout Regulator
General Description
The LP2966 dual ultra low-dropout (LDO) regulator operates
from a +2.70V to +7.0V input supply. Each output delivers
150mA over full temperature range. The IC operates with ex-
tremely low drop-out voltage and quiescent current, which
makes it very suitable for battery powered and portable ap-
plications. Each LDO in the LP2966 has independent shut-
down capability. The LP2966 provides low noise perfor-
mance with low ground pin current in an extremely small
MSOP-8 package (refer to package dimensions and connec-
tion diagram for more information on MSOP-8 package). A
wide range of preset voltage options are available for each
output. In addition to the voltage combinations listed in the
ordering information table, many more are available upon re-
quest with minimum orders. In all, 256 voltage combinations
are possible.
Key Specifications
Dropout Voltage: Varies linearly with load current. Typically
0.9 mV at 1mA load current and 135mV at 150mA load cur-
rent.
Ground Pin Current: Typically 300A at 1mA load current
and 340A at 100mA load current (with one shutdown pin
pulled low).
Shutdown Mode: Less than 1A quiescent current when
both shutdown pins are pulled low.
Error Flag: Open drain output, goes low when the corre-
sponding output drops 10% below nominal.
Precision Output Voltage: Multiple output voltage options
available ranging from 1.8V to 5.0V with a guaranteed accu-
racy of
1% at room temperature.
Features
n
Ultra low drop-out voltage
n
Low ground pin current
n
<
1A quiescent current in shutdown mode
n
Independent shutdown of each LDO regulator
n
Output voltage accuracy
1%
n
Guaranteed 150mA output current at each output
n
Low output noise
n
Error Flags indicate status of each output
n
Available in MSOP-8 surface mount packages
n
Low output capacitor requirements (1F)
n
Operates with Low ESR ceramic capacitors in most
applications
n
Over temperature/over current protection
n
-40C to +125C junction temperature range
Applications
n
Cellular and Wireless Applications
n
Palmtop/Laptop Computer
n
GPS systems
n
Flat panel displays
n
Post regulators
n
USB applications
n
Hand held equipment and multimeters
n
Wireless data terminals
n
Other battery powered applications
Typical Application Circuit
DS100850-30
*SD1 and SD2 must be actively terminated through a pull up resistor. Tie to V
IN
if not used.
**ERROR1 and ERROR2 are open drain outputs. These pins must be connected to ground if not used.
# Minimum output capacitance is 1F to insure stability over full load current range. More capacitance improves superior dynamic performance and provides
additional stability margin.
April 2000
LP2966
Dual
150mA
Ultra
Low-Dropout
Regulator
2000 National Semiconductor Corporation
DS100850
www.national.com
Block Diagram
Connection Diagram
Pin Description
Pin
Name
Function
1
VIN
Input Supply pin
2
SD1
Active low shutdown pin for output 1
3
SD2
Active low shutdown pin for output 2
4
GND
Ground
5
ERROR2 Error flag for output 2 - Normally high impedance, should be connected to ground if not
used.
6
ERROR1 Error flag for output 1 - Normally high impedance, should be connected to ground if not
used.
7
VOUT2
Output 2
8
VOUT1
Output 1
DS100850-31
DS100850-32
Top View
Mini SO-8 Package
8-Lead Small Outline Integrated Circuit (SOIC)
Package Code: MSOP-8
LP2966
Dual
150mA
Ultra
Low-Dropout
Regulator
www.national.com
2
Ordering Information
The following voltage options and their combinations are possible.
5.0V, 4.0V, 3.8V, 3.6V, 3.3V, 3.2V, 3.1V, 3.0V, 2.9V, 2.8V, 2.7V, 2.6V, 2.5V, 2.4V, 2.0V and 1.8V
TABLE 1.
Output Voltage 1
Output Voltage 2
Order Number
Package Marking
Supplied As:
5.0
5.0
LP2966IMM-5050
LAFB
1000 units on tape and reel
5.0
5.0
LP2966IMMX-5050
LAFB
3500 units on tape and reel
3.6
3.6
LP2966IMM-3636
LAEB
1000 units on tape and reel
3.6
3.6
LP2966IMMX-3636
LAEB
3500 units on tape and reel
3.3
3.6
LP2966IMM-3336
LAHB
1000 units on tape and reel
3.3
3.6
LP2966IMMX-3336
LAHB
3500 units on tape and reel
3.3
3.3
LP2966IMM-3333
LADB
1000 units on tape and reel
3.3
3.3
LP2966IMMX-3333
LADB
3500 units on tape and reel
3.3
2.5
LP2966IMM-3325
LARB
1000 units on tape and reel
3.3
2.5
LP2966IMMX-3325
LARB
3500 units on tape and reel
3.0
3.0
LP2966IMM-3030
LACB
1000 units on tape and reel
3.0
3.0
LP2966IMMX-3030
LACB
3500 units on tape and reel
2.8
3.0
LP2966IMM-2830
LASB
1000 units on tape and reel
2.8
3.0
LP2966IMMX-2830
LASB
3500 units on tape and reel
2.8
2.8
LP2966IMM-2828
LABB
1000 units on tape and reel
2.8
2.8
LP2966IMMX-2828
LABB
3500 units on tape and reel
2.5
2.5
LP2966IMM-2525
LAAB
1000 units on tape and reel
2.5
2.5
LP2966IMMX-2525
LAAB
3500 units on tape and reel
1.8
3.3
LP2966IMM-1833
LCFB
1000 units on tape and reel
1.8
3.3
LP2966IMMX-1833
LCFB
3500 units on Tape and reel
1.8
1.8
LP2966IMM-1818
LA9B
1000 units on tape and reel
1.8
1.8
LP2966IMMX-1818
LA9B
3500 units on tape and reel
The voltage options and combinations shown in
Table 1 are available. For other custom voltage options or combinations
of voltage options, please contact your nearest National Semiconductor Sales Office.
LP2966
Dual
150mA
Ultra
Low-Dropout
Regulator
www.national.com
3
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
-65 to +150C
Lead Temp. (Soldering, 5 sec.)
260C
Power Dissipation (Note 2)
Internally Limited
ESD Rating (Note 3)
2kV
Input Supply Voltage (Survival)
-0.3V to 7.5V
Shutdown Input Voltage (Survival)
-0.3V to (Vin + 0.3V)
Maximum Voltage for ERROR
Pins
10V
I
OUT
(Survival)
Short Circuit
Protected
Output Voltage (Survival)(Note 6),
(Note 7)
-0.3V to (Vin + 0.3V)
Operating Ratings
(Note 1)
Input Supply Voltage
2.7V to 7.0V
Shutdown Input Voltage
-0.3V to (Vin + 0.3V)
Operating Junction
Temperature Range
-40C to +125C
Maximum Voltage for
ERROR pins
10V
Electrical Characteristics
Limits in standard typeface are for T
j
= 25C, and limits in boldface type apply over the full operating junction temperature
range. Unless otherwise specified, V
IN
= V
O(NOM)
+ 1V, (Note 16), C
OUT
= 1F, I
OUT
= 1mA, C
IN
= 1F, V
SD1
= V
SD2
= V
IN
.
Symbol
Parameter
Conditions
Typ
(Note 4)
LP2966IMM (Note 5)
Unit
Min
Max
V
o
(Note 13)
Output Voltage Tolerance
V
OUT
+ 1V
<
V
IN
<
7.0V
0.0
-1
1
%V
NOM
-3
3
1mA
<
I
L
<
100mA
0.0
-1.5
1.5
%V
NOM
-3.5
3.5
V
O
/
V
IN
(Note 8)
(Note 13)
Output Voltage Line
Regulation
0.1
mV/V
V
O
/
I
OUT
Output Voltage Load
Regulation (Note 9)
1mA
<
I
L
<
100mA
(Note 9)
0.1
mV/mA
V
O2
/
I
OUT1
Output Voltage Cross
Regulation (Note 10)
1mA
<
I
L1
<
100mA
(Note 10)
0.0004
mV/mA
V
IN
-V
OUT
Dropout Voltage
(Note 12)
I
L
= 1mA
0.9
2.0
3.0
I
L
= 100mA
90
130
mV
180
I
L
= 150mA
135
195
270
I
GND(1,0)
(Note 18)
Ground Pin Current (One
LDO On)
I
L
= 1mA
300
A
V
SD2
0.1V, V
SD1
= V
IN
I
L
= 100mA
340
V
SD2
0.1V, V
SD1
= V
IN
I
GND(1,1)
Ground Pin Current (Both
LDOs On)
I
L
= 1mA
340
450
A
500
I
L
= 100mA
420
540
600
I
GND(0,0)
Ground Pin Current in
Shutdown Mode
V
SD1
= V
SD2
0.1V
0.006
0.3
10
A
I
O(PK)
Peak Output Current
(Note 2)
V
OUT
V
OUT(NOM)
- 5%
500
350
150
mA
Short Circuit Foldback Protection
I
FB
Short Circuit Foldback
Knee
(Note 2), (Note 14)
600
mA
LP2966
Dual
150mA
Ultra
Low-Dropout
Regulator
www.national.com
4
Electrical Characteristics
(Continued)
Limits in standard typeface are for T
j
= 25C, and limits in boldface type apply over the full operating junction temperature
range. Unless otherwise specified, V
IN
= V
O(NOM)
+ 1V, (Note 16), C
OUT
= 1F, I
OUT
= 1mA, C
IN
= 1F, V
SD1
= V
SD2
= V
IN
.
Symbol
Parameter
Conditions
Typ
(Note 4)
LP2966IMM (Note 5)
Unit
Min
Max
Over Temperature Protection
Tsh(t)
Shutdown Threshold
165
C
Tsh(h)
Thermal Shutdown
Hysteresis
25
C
Shutdown Input
V
SDT
Shutdown Threshold
(Note 15)
Output = Low
0
0.1
V
Output = High
V
IN
V
IN
- 0.1
T
dOFF
Turn-off Delay (Note 17)
I
L
= 100 mA
20
sec
T
dON
Turn-on Delay (Note 17)
I
L
= 100 mA
25
sec
I
SD
SD Input Current
V
SD
= V
IN
1
nA
V
SD
= 0 V
1
Error Flag Comparators
V
T
Threshold (output goes
high to low)
10
5
16
%
(Note 11)
V
TH
Threshold Hysteresis
5
2
8
%
(Note 11)
V
ERR(Sat)
Error Flag Saturation
I
Fsink
= 100A
0.015
0.1
V
I
EF(leak)
Error Flag Pin Leakage
Current
1
nA
I
(EFsink)
Error Flag Pin Sink Current
1
mA
AC Parameters
PSRR
Ripple Rejection
V
IN
= V
OUT
+ 1V, f =
120Hz, V
OUT
= 3.3V
60
dB
V
IN
= V
OUT
+ 0.3V, f =
120Hz, V
OUT
= 3.3V
40
n(1/f)
Output Noise Density
f =120Hz
1
V/
Hz
e
n
Output Noise Voltage (rms)
BW = 10Hz - 100kHz,
C
OUT
= 10F
150
V(rms)
BW = 300Hz - 300kHz,
C
OUT
= 10F
100
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical characteristics. The guar-
anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the surface-mount package must be derated at
jA
= 235C/W, junction-to-ambient. Please refer to the applications section on maximum current capability for further information. The device has internal thermal pro-
tection.
Note 3: The human body model is a 100pF capacitor discharged through a 1.5k
resistor into each pin.
Note 4: : Typical numbers are at 25C and represent the most likely parametric norm.
Note 5: : Limits are 100% production tested at 25C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National's Averaging Outgoing Quality Level (AOQL).
Note 6: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2966 output must be diode-clamped to ground.
Note 7: The output PMOS structure contains a diode between the V
IN
and V
OUT
terminals that is normally reverse-biased. Reversing the polarity from V
IN
and V
OUT
will turn on this diode.
Note 8: Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in input line voltage.
Note 9: Output voltage load regulation is defined as the change in output voltage from the nominal value when the load current changes from 1mA to 100mA.
Note 10: Output voltage cross regulation is defined as the percentage change in the output voltage from the nominal value at one output when the load current
changes from 1mA to full load in the other output. This is an important parameter in multiple output regulators. The specification for
V
O1
/
I
OUT2
is equal to the speci-
fication for
V
O2
/
I
OUT1
.
Note 11: Error Flag threshold and hysteresis are specified as the percentage below the regulated output voltage.
Note 12: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below the nominal value. Drop-out voltage specifi-
cation applies only to output voltages greater than 2.7V. For output voltages below 2.7V, the drop-out voltage is nothing but the input to output differential, since the
minimum input voltage is 2.7V.
Note 13: Output voltage tolerance specification also includes the line regulation and load regulation.
LP2966
Dual
150mA
Ultra
Low-Dropout
Regulator
www.national.com
5
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