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SP6121
Low Voltage, Synchronous Step Down PWM Controller
Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
FEATURES
■ Optimized for Single Input Voltage - 3V to 5.5V
VCC 1
8 PDRV
■ High Efficiency: Greater than 95% possible
■ Accurate, 500kHz Fixed Frequency Operation
■ Fast Transient Response
■ 500 μ A, I Q (25 μ A in Shutdown)
GND 2
VFB 3
COMP 4
SP6121
8 Pin nSOIC
7 NDRV
6 ISET
5 ISENSE
■ Internal, 0.4 V/ms, Soft Start Circuit
■ Precision 1% Reference
■ Resistor Programmable Output Voltage
■ Lossless Adjustable Current Limit with
■ High Side R DS(ON) Sensing
■ 0% to 100% Duty Cycle Range
■ High Side PMOS Switch Negates Need for
■ External Charge Pump
■ Output Over Voltage Protection
■ Hiccup Mode Current Limit Protection
Now Available in Lead Free Packaging
APPLICATIONS
■ Supply Bias for
- DSP
- Microprocessor Core
- I/O & Logic
■ Video Cards
■ Board Level Supply in
Distributed Power Systems
DESCRIPTION
The SP6121 is a fixed frequency, voltage mode, synchronous PWM controller designed to work
from a single 5V or 3.3V input supply, providing excellent AC and DC regulation for high efficiency
power conversion. The operating frequency is internally set at 500kHz, permitting the use of
small, surface mount inductors and capacitors. Requiring only few external components, the
SP6121 packaged in an 8-pin SOIC, is especially suited for low voltage applications where cost,
small size and high efficiency are critical. With its low voltage capability and inherent 100% duty
cycle operation, the SP6121 allows low dropout operation in the event of a low input supply
voltage condition.
TYPICAL APPLICATION CIRCUIT
3.3V
RV CC
5
?
RSET
2.3k
Q1
C IN
47 μ F
Ceramic 6.3V
V IN
CB
3.3 μ F
V CC
GND
PDRV
SP6121
U1 NDRV
Q2
DS
1.8 μ H
L1
C OUT
470 μ F x 2
1.9V 8A
V OUT
R1
V FB
I SET
5.2k
RZ
10k
COMP
I SENSE
R2
10k
CP
50pF
CZ
3.7nF
Q1 = FAIRCHILD FDS6375
Q2 = FAIRCHILD FDS6690A
DS = STMICROELECTRONICS STPS2L25BU
L1 = PANASONIC ETQ-P6F1R6SFA
C OUT = SANYO 4TPB470M
Date: 11/29/04
SP6121 Low Voltage, Synchronous Step Down PWM Controller
1
? Copyright 2004 Sipex Corporation
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