Multi Mode Capless Charge
TM
Pump
POWER MANAGEMENT
Description
The SC1461 is a versatile charge pump designed for use
in battery operated power supply applications. A simple,
low current boost circuit 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 device footprint allows for
compact circuit design.
The SC1461 is a Capless
TM
charge pump for applications
that require up to 8mA of output current. Three modes
of output voltage can be programmed via the ADJ pin.
Modes include:
V
O
= (1.32*V
IN
) 鹵 4% @ 7mA of output current
V
O
= (1.515 * V
IN
) 鹵 4% @ 4mA of output current
and the adjustable mode where an external resistor
divider determines the output voltage.
The SC1461 is packaged in a 5 lead SOT-23 package.
SC1461
Features
K
K
K
K
Small size - 5 pin SOT-23 package
4% voltage accuracy
65uA typ. quiescent current
User selectable output voltages of 1.515* V
IN
,
1.32 * V
IN
, or adjustable output
K
All specifications rated over full temperature range
(-40擄C to 85擄C)
Applications
K
K
K
K
K
PDA Power Supplies
Notebook Power Supplies
Peripheral Card Supplies
Industrial Power Supplies
High Density DC/DC Conversion
Typical Application Circuit
R1
錚?/div>
錚?/div>
Vo
=
1.03
脳
Vin
脳 錚?/div>
1
+
錚?/div>
R1
+
R2
錚?/div>
錚?/div>
Vin = 3.3V
SC1461
Vo = 5.0V
Vin = 2.5V
SC1461
Vo = 3.3V
Vo
SC1461
Vin
5
4
5
4
4
Disable Vin
Disable Vin
Cin
0.22uF
Cout
47nF
Cin
0.22uF
Cout
47nF
Cout
47nF
Disable Vin
Vo
Vo
Vo
5
R1
Cin
0.22uF
GND
GND
Vin
1
2
3
1
2
3
3
2
GND
ADJ
ADJ
ADJ
R2
Revision 1, December 2000
1
1
www.semtech.com
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