SC2603
Simple PWM Boost Controller
POWER MANAGEMENT
Description
The SC2603 is a versatile, low-cost, voltage-mode PWM
controller designed for 16V input DC/DC power supply
applications. A simple, fixed-voltage boost regulator can
be implemented using the SC2603 with a minimum of
external components. The small device footprint
allows for compact circuit design.
SC2603 features include a temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator, frequency shift over-current protection, and
an internally compensated error amplifier. Pulse by pulse
current limiting is implemented by sensing the
differential voltage across an external resistor, or an
appropriately sized PC board trace.
The SC2603 operates at a fixed frequency of 200kHz,
providing an optimum compromise between efficiency,
external component size, and cost.
Features
Low cost / small size
Switch mode efficiency up to 95%
1% reference voltage accuracy
Over-current protection
800mA output drive
5V to 16V input power source
No need for external compensation network
SOT23-6 is fully WEEE and RoHS compliant
Applications
Portable Devices
Flat Panel TV
TV Set Top Box
Auxiliary Supplies
Peripheral Card Supplies
Industrial Power Supplies
High Density DC/DC Conversion
Typical Application Circuit
D1
L1
VIN
R1
VOUT
C1
R2
C2
Q1
C3
D2
optional
5
U2
VIN
Gate
4
GND
R3
Enable
(open collector)
Open Drain with < 100
pull down impedance
3
1
C4
EN/SS
CS
FB
GND
6
2
C5
R4
R5
SC2603
Revision: Nov 14, 2006
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