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Электронный компонент: SC1462

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SC1462
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH OUTPUT CURRENT
CHARGE PUMP DOUBLER
October 20, 2000
1
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1462 is a versatile charge pump designed for
use in battery operated power supply applications over
the wide input range of 1.65 to 5.5 volts. A simple, low
quiescent current charge pump doubler can be imple-
mented without costly inductors or capacitors. Internal
MOSFETs and control circuitry eliminate the need for
costly board space and design time. The small 6 lead
SOT-23 package helps minimize board space.
The SC1462
charge pump can be used for applica-
tions that require up to 80mA of output current with V
IN
= 2.5V to 5.5V. Typical dropout voltage (2*Vin-Vout) is
shown below for several values of Vin.
FEATURES
=
Input supply voltage range of 1.65V to 5.5V
=
Small size - 6 pin SOT-23 package
=
Typical efficiency of :
91% @ Vin = 2.5V, Iout = 45mA
94% @ Vin = 3.6V, Iout = 55mA
=
Short circuit and over-temperature protection
=
140A typical input current @ no load
=
Shutdown current <1A
=
Designed to work with ceramic or Tantalum
capacitors
=
Fixed frequency of 160kHz
=
All specifications rated over full temperature
range (-40C to 85C)
APPLICATIONS
=
Cellular phones
=
Handheld devices
ORDERING INFORMATION
DEVICE
(1)
PACKAGE
Temp. Range (T
A
)
SC1462ISKTR
SOT-23-6
-40C to 85C
Note:
(1) Only available in tape and reel packaging. A reel
contains 3000 devices.
TYPICAL APPLICATION SCHEMATIC
Typical Dropou t Voltage vs Iou t
@T a = 25 Deg. C.
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
000E+0
20E-3
40E-3
60E-3
80E-3
100E-3
Iout (A)
O
u
t
p
u
t
D
r
opou
t
V
o
l
t
age (
V
)
Vin = 1.5V
Vin = 2.5V
Vin = 3.6V
Vin = 4.5V
Vin = 5.5V
SC1462
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH OUTPUT CURRENT
CHARGE PUMP DOUBLER
October 20, 2000
2
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
Units
Supply Voltage
VIN
-0.3 to +6.0
V
Output Voltage
VO
-0.3 to +12
V
V
OUT
Short Circuit Duration
SC
Indefinite
Thermal Resistance
Junction to Ambient
JA
230
C/W
Operating Ambient
Temperature Range
T
A
-40 to +85
C
Junction Temperature Range
T
J
-40 to +125
C
Storage Temperature Range
T
STG
-65 to +150
C
Lead Temperature
(Soldering) 10 seconds
T
L
300
C
ELECTRICAL CHARACTERISTICS
Unless specified: T
A
= -40C to 85C, SHDN = GND, 1.65V
V
IN
=
5.5V, C
IN
= C
OUT
= C
BUCKET
= 3.3F (ESR = 0.3
).
Parameter
Symbol
Conditions
MIN
TYP
MAX
Units
Input Supply Voltage
V
IN
1.65
5.5
V
Input Supply Current
I
IN
I
O
= 0, V
IN
= 2.5V freq = 160kHz
140
260
A
I
O
= 0, V
IN
= 3.6V freq = 160kHz
200
400
A
SHDN = V
IN
0.1
1
A
Output Resistance
(5)
R
out
V
IN
= 2.5V
9.5
13.5
Output Resistance
(5)
R
out
V
IN
= 3.6V
7.5
10.5
Total Switch Resistance
(6)
R
SW
V
IN
= 2.5V
3
4.5
Total Switch Resistance
(6)
R
SW
V
IN
= 3.6V
2
3
Output Current
I
O
V
IN
= 2.5V
80
mA
V
IN
= 3.6V
80
mA
Oscillator Frequency
OSC
1.65V
V
IN
=
5.5V
100
160
200
KHz
Short Circuit Current
I
SC
V
out
= 0V
200
mA
Output Ripple (pk-pk)
(1)(3)
V
R
I
O
= 45mA, V
IN
= 2.5V
Frequency = 160kHz
75
mV
Power Efficiency
(1)
I
O
= 45mA,V
IN
= 2.5V
freq = 160kHz
86
%
SC1462
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH OUTPUT CURRENT
CHARGE PUMP DOUBLER
October 20, 2000
3
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
ELECTRICAL CHARACTERISTICS
Unless specified: T
A
= -40C to 85C, SHDN = GND, 1.65V
V
IN
=
5.5V, C
IN
= C
OUT
= C
BUCKET
= 3.3F (ESR = 0.3
).
Parameter
Symbol
Conditions
MIN
TYP
MAX
Units
Maximum Output Voltage
(3)
V
OUT
I
O
= 0mA
2*V
IN
V
Input High Threshold
V
ih
SHDN pin, 2.5
V
IN
5.5
1.6
V
Input Low Threshold
V
il
SHDN pin, 2.5
V
IN
5.5
0.4
V
Time to Regulation at
Turn-on
(2)
t
ON
I
O
= 0 to 60 mA, V
IN
= 3.6V
freq = 160kHz
500
s
Over Temperature
protection
(3)
O.T.
140
C
Over Temperature
Hysteresis
(3)
O.T.H
20
C
NOTES:
(1) All electrical characteristics are for the application circuit on page 1.
(2) Soft start functionality is performed along with short circuit protection. If V
OUT
is less than V
IN
- 200mV, then all
switches are turned off and V
OUT
is charged with a 200mA current source from V
IN
. When V
OUT
reaches V
IN
-
200mV all switches are enabled.
(3) Guaranteed by design.
(4) This device is ESD sensitive. Use of standard ESD handling precautions is required.
(5) The internal switch resistance, the capacitor ESR and the Oscillator's switching frequency all contribute to
R
out
. See the CAPACITOR SELECTION section for information on applying the R
out
specification.
(6) The parameter R
sw
is equal to the total resistance of all 4 internal switches. See the CAPACITOR SELECTION
section for information on applying the R
sw
specification. This parameter was calculated from actual output re-
sistance and the equation on page 7 for R
out
.
SC1462
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH OUTPUT CURRENT
CHARGE PUMP DOUBLER
October 20, 2000
4
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
Pin #
SOT-23-6
Pin
Name
Pin Function
1
VIN
Supply voltage input.
2
GND
Ground.
3
C-
This pin should be connected to the negative terminal of the external charging
capacitor.
4
SHDN
Shutdown pin. When this pin is connected to VIN, the device enters sleep mode.
5
VO
Voltage output.
6
C+
This pin should be connected to the positive terminal of the external charging
capacitor.
PIN DESCRIPTION
BLOCK DIAGRAM
PIN CONFIGURATION
6 Lead SOT-23
(Top View)
SC1462
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
HIGH OUTPUT CURRENT
CHARGE PUMP DOUBLER
October 20, 2000
5
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
Cin
3.3uF
C2
10nF
EN
C3
1uF
VIN = 3V to 5.5V
Cout
3.3uF
U1
SC1462
3
1
2
4
6
5
C-
VIN
GND
SHDN C+
Vo
Cbucket
3.3uF
U2
SC2982
1
2
3
4
5
VIN
GND
EN
BYPASS
VOUT
VOUT = 5V
5 Volts Fixed output Voltage
VOUT = 3.3V
Cbucket
3.3uF
VIN = 2V to 3V
U2
SC1453
1
2
3
4
5
IN
GND
EN
BYP
OUT
EN
U1
SC1462
3
1
2
4
6
5
C-
VIN
GND
SHDN C+
Vo
C2
10nF
Cin
3.3uF
Cout
3.3uF
C3
1uF
3.3 Volts Fixed output Voltage