SC2608 Datasheet, PDF (1/15 Pages) Semtech Corporation – Simple, Synchronous Voltage Mode PWM Controller

SC2608
Simple, Synchronous
Voltage Mode PWM Controller
POWER MANAGEMENT
Description
The SC2608 is a versatile voltage-mode PWM controller
designed for use in step down DC/DC power supply appli-
cations. A simple, fixed frequency, highly efficient buck
regulator can be implemented using the SC2608 with mini-
mal external components. The input voltage range is from
+3.3V to +12V. Internal level shift and drive circuitry elimi-
nates the need for an expensive P-channel, high-side
MOSFET. The small device footprint allows for compact
circuit design.
SC2608 features include temperature compensated volt-
age reference, triangle wave oscillator, current limit com-
parator, and an externally compensated error amplifier.
Current limit is implemented by sensing the voltage drop
across the bottom MOSFET R_DS(ON).
The SC2608 operates at a fixed frequency of 200kHz
providing an optimum compromise between efficiency ,
external component size, and cost.
SC2608 has a thermal protection circuit, which is
activated if the junction temperature exceeds 150 ^OC.
Features
‹ +3.3V or +5V or +12V input voltage
‹ 200kHz operation
‹ High efficiency (>90%)
‹ 1% Reference voltage accuracy
‹ Hiccup mode over current protection
‹ Robust output drive
‹ R_DS(ON) Current sensing for protection
‹ Industrial temperature range
‹ SO-8 package
‹ Integrated boot strap diode
‹ Thermal Shut down
‹ Fully WEEE and RoHS Compliant
Applications
‹ Termination supplies
‹ Low cost microprocessor supplies
‹ Peripheral card supplies
‹ Industrial power supplies
‹ High density DC/DC conversion
Typical Application Circuit
SC2608
COMP/SS SENSE
GND
VCC
sense
+12V
+12V/+5V/+3.3V
DL
PHASE
DH
BST
VOUT
sense
Revision 4: October, 2005
Figure 1
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