®
SP6128A
Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
Low Voltage, Synchronous Step Down PWM Controller
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Optimized for Single Supply, 3V - 5.5V Applications
GL 1
14 BST
High Efficiency: Greater Than 95% Possible
PV
CC
2
13 GH
V
CC
3
Discontinuous Startup for Precharged Output
12 SWN
SP6128A
PGND 4
Accurate Fixed 300kHz Frequency Operation
11 I
SET
14 pin TSSOP
GND 5
10 V
FB
Fast Transient Response
COMP 6
NC
9
Internal Soft Start Circuit
NC 7
NC
8
Accurate 0.8V Reference Allows Low Output
Voltages
Now Available in Lead Free Packaging
Resistor Programmable Output Voltage
Resistor Programmable Overcurrent Threshold
APPLICATIONS
Loss-less Current Limit with High Side R
DS(ON)
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DSP
Sensing
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Microprocessor Core
Hiccup Mode Current Limit Protection
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I/O & Logic
Dual N-Channel MOSFET Synchronous Driver
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Industrial Control
Quiescent Current: 500µA, 30µA in Shutdown
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Distributed Power
14 pin TSSOP
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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
10µF
C6
10µF
C7
10µF
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
1µF
R3
8k
Q1
FDS6690A
L1
1.0µH
2.5V/10A
C1
2.2µF
D2
STPS2L25U
Q2
FDS6690A
C12
4.7nF
R4
1.7k
C8
10µF
C9
10µF
C10
10µF
C11
470µF
C3
68pF
R5
800
R2
7.87k C2 4.7n
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller
© Copyright 2005 Sipex Corporation
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SIPEX [ SIPEX CORPORATION ]
