Low Voltage Synchronous Step Down PWM Controller - Sipex
Description
®
SP6128A
Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters
Low Voltage, Synchronous Step Down PWM Controller
■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Optimized for Single Supply, 3V - 5.
5V Applications GL 1 14 BST High Efficiency: Greater Than 95% Possible PVCC 2 13 GH VCC 3 Discontinuous Startup for Precharged Output 12 SWN SP6128A PGND 4 Accurate Fixed 300kHz Frequency Operation 11 ISET 14 pin TSSOP GND 5 10 VFB 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 RDS(ON) ■ DSP Sensing ■ Microprocessor Core Hiccup Mode Current Limit Protection ■ I/O & Logic Dual N-Channel MOSFET Synchronous Driver ■ Industrial Control Quiescent Current: 500µA, 30µA in Shutdown ■ Distributed Power 14 pin TSSOP ■ 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 packaged 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 4
GL
BST
14 13 12 11 10 9 8
C4 1µF
R3 8k
Q1 FDS6690A L1 1.
0µH
PVCC SP6128A GH VCC PGND GND COMP NC SWN ISET VFB NC NC
2.
5V/10A
C1 2.
2µF
5 6 7
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
...
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