SC1462A Datasheet, PDF (1/9 Pages) Semtech Corporation – High Efficency Charge Pump Doubler

SC1462A
High Efficiency Charge Pump Doubler
POWER MANAGEMENT
Description
The SC1462A 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 quies-
cent current charge pump doubler can be
implemented 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 SC1462A charge pump can be used for applications
that require up to 25mA of output current with V_IN = 2.5V
to 5.5V. Typical dropout voltage (2*Vin)-Vout is shown on
page 8 for several values of Vin.
Features
K Input supply voltage range of 1.65V to 5.5V
KSmall size - 6 pin SOT-23 package
KTypical efficiency of :
91% @ Vin = 2.5V, Iout = 15mA
K Short circuit and over-temperature protection
K 55µA typical input current @ no load
K Shutdown current <1µA
K Designed to work with ceramic or Tantalum capacitors
K Fixed frequency of 32kHz
K All specifications rated over full temperature range
(-40°C to 85°C)
8 00.0 E-3
7 00.0 E-3
6 00.0 E-3
5 00.0 E-3
Typ ic a l D ro p ou t V ol ta ge v s Io u t
@ Ta = 25 Deg . C.
Vin = 1.5 V
Vin = 2.5 V
Vin = 3.6 V
Vin = 4.5 V
Vin = 5.5 V
4 00.0 E-3
3 00.0 E-3
2 00.0 E-3
1 00.0 E-3
0 00 .0 E + 0
0 00 E + 0
5 E-3
10 E-3
15 E-3
Io u t (A )
20 E-3
25 E-3
30 E-3
Applications
K Cellular phones
K Handheld devices
K LCD display
Typical Application Schematic
SC1462A
1uF
1uF
1uF
Revision 1/2001
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