SC1462_05 Datasheet, PDF (1/10 Pages) Semtech Corporation – High Output Current Charge Pump Doubler

POWER MANAGEMENT
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 qui-
escent 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 SC1462 charge pump can be used for applications
that require up to 80mA of output current with V_IN = 2.5V
to 5.5V. Typical dropout voltage (2×V_IN)-V_OUT is shown be-
low for several values of V_IN.
SC1462
High Output Current
Charge Pump Doubler
Features
‹ Input supply voltage range of 1.65V to 5.5V
‹ Small size - 6 pin SOT-23 package
‹ Typical efficiency of :
91% @ V_IN = 2.5V, I_OUT = 45mA
94% @ V = 3.6V, I = 55mA
‹
IN
OUT
Short circuit and over-temperature protection
‹ 140μA typical input current @ no load
‹ Shutdown current <1μA
‹ Designed to work with ceramic or tantalum
capacitors
‹ Fixed frequency of 160kHz
‹ All specifications rated over full temperature range
(-40°C to 85°C)
Typical Dropout Voltage vs. IOUT
@TA = 25 Deg. C.
0.9
0.8
VIN = 1.5V
VIN = 2.5V
0.7
VIN = 3.6V
VIN = 4.5V
0.6
VIN = 5.5V
0.5
Applications
0.4
0.3
0.2
Typ₀ic_.1 al Application Circuit
‹ Cellular phones
‹ Handheld devices
‹ LCD Display
0.0
000E+0
20E-3
40E-3
60E-3
IOUT (A)
80E-3
100E-3
Typical Application Circuit
Logic Control or GND
V_IN
SC1462
4 _SHDN
VOUT ⁵
1 _VIN
C_IN
3.3μF
GND
2
C+ ⁶
C- ³
C_BUCKET
3.3μF
V_OUT
C_OUT
3.3μF
December 12, 2005
1
www.semtech.com