SC2602L Datasheet, PDF (1/14 Pages) Semtech Corporation – Synchronous Voltage Mode Controller for Distributed Power Supply

SC2602L
Synchronous Voltage Mode Controller
for Distributed Power Supply
POWER MANAGEMENT
Description
Features
The SC2602L is low-cost, full featured, synchronous volt-
age-mode controller designed for use in single ended
power supply applications where efficiency is of primary
concern. Synchronous operation allows for the elimina-
tion of heat sinks in many applications. The SC2602L is
ideal for implementing DC/DC converters needed to
power advanced microprocessors in low cost systems,
or in distributed power applications where efficiency is
important. Internal level-shift, high-side drive circuitry, and
preset shoot-through control, allows the use of inexpen-
sive N-channel power MOSFETs.
‹ Synchronous operation for high efficiency (95%)
‹ R_DS(ON) current sensing
‹ Output voltage can be programmed as low as 0.8V
‹ On-chip power good and OVP functions
‹ Small size with minimum external components
‹ Soft Start
‹ Enable function
‹ SO-14 package is fully WEEE and RoHS compliant
Applications
SC2602L features include temperature compensated
voltage reference, triangle wave oscillator and current
sense comparator circuitry. Power good signaling, shut-
down, and over voltage protection are also provided.
The SC2602L operates at a fixed 200kHz which is for
optimum compromise between efficiency, external com-
ponent size, and cost.
‹ Microprocessor core supply
‹ Low cost synchronous applications
‹ Voltage Regulator Modules (VRM)
‹ DDR termination supplies
‹ Networking power supplies
‹ Sequenced power supplies
Two SC2602L can be used together to sequence two
voltage regulators for power up in telecom systems. The
power good of the first SC2602L connected to the en-
able of the second SC2602L makes this possible.
Typical Application Circuit
V_pullup
PWRGD
OVP
R1
R2
R3
C1
C5
R4
U1
C6 1
VCC
14
GND
2 _{PWRGD SS/SHDN} 13
3 _OVP
COMP ¹²
4 _OCSET
SENSE ¹¹
5 _PHASE
BSTH ¹⁰
6 _DH
BSTL ⁹
D1
7
8
PGND
DL
SC 2602L
C4
SS/ SH D N
R5
C7
12V IN
C8
Q1
L1
Q2
R8
Figure 1. Typical distributed power supply
Revision: January 05, 2006
1
5V IN
+
C3
C2
GND
R6
2.5V OUT
+
C10
C9
R7
GND
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