SC2608A
SC2608A is Synchronous Voltage Mode PWM Controller manufactured by SEMTECH.
Description
The SC2608A is a versatile voltage-mode PWM controller designed for use in step down DC/DC power supply applications. A simple, fixed frequency, highly efficient buck regulator can be implemented using the SC2608A with minimal external ponents. The input voltage range is from +5V to +12V. Internal level shift and drive circuitry eliminates the need for an expensive P-channel, high-side MOSFET. The small device footprint allows for pact circuit design. ..
Features
+5V or +12V input voltage 250k Hz operation High efficiency (>90%) 1.5% Reference voltage accuracy Hiccup mode over current protection Robust output drive RDS(ON) Current sensing for protection Industrial temperature range SO-8 package Integrated boot strap diode Thermal Shut down Fully WEEE and Ro HS pliant
SC2608A Features include temperature pensated voltage reference, triangle wave oscillator, current limit parator, and an externally pensated error ampli- fier. Current limit is implemented by sensing the voltage drop across the bottom MOSFET RDS(ON).
Applications
Termination supplies Low cost microprocessor supplies Peripheral card supplies Industrial power supplies High density DC/DC conversion
The SC2608A operates at a fixed frequency of 250k Hz providing an optimum promise between efficiency , external ponent size, and cost. SC2608A has a thermal protection circuit, which is activated if the junction temperature exceeds 150 OC.
Typical Application Circuit
SC2608
SC2608A sense P/SS SENSE
+12V/+5V/+3.3V +12V
GND VCC
PHASE
VOUT sense
Figure 1
Revision 2: April, 2006 1 .semtech.
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied.
P ar am e t e r VCC to GND BST to PHASE BST to GND PHASE to GND (note1)
.. DH to PHASE
(note1)
S...
