鈻?/div>
Low Voltage Power
DESCRIPTION
The SP6128A 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. Requiring only few external components, the SP6128A pack-
aged in an 14-pin TSSOP, is especially suited for low voltage applications where cost, small
size and high efficiency are critical. The operating frequency is internally set to 300kHz,
allowing small inductor values and minimizing PC board space. The SP6128A drives two
N-channel power MOSFETs for improved efficiency and includes an accurate 0.8V reference
for low output voltage applications.
TYPICAL APPLICATION CIRCUIT
3V to 5.5V
C5
10碌F
C6
10碌F
C7
10碌F
D1
MBR0530
R1
5
1
2
3
GL
BST
14
13
PV
CC
SP6128A
GH
12
V
CC
SWN
4
11
I
SET
PGND
5
6
7
GND
COMP
NC
V
FB
NC
NC
10
9
8
C4
1碌F
R3
8k
Q1
FDS6690A
L1
1.0碌H
2.5V/10A
C1
2.2碌F
D2
STPS2L25U
Q2
FDS6690A
C12
4.7nF
R4
1.7k
C8
10碌F
C9
10碌F
C10
10碌F
C11
470碌F
C3
68pF
R5
800
R2
7.87k C2 4.7n
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller
漏 Copyright 2005 Sipex Corporation
1