Datasheet

SLUU111 – June 2002
4
1-MHz, 3.3-V, High-Efficiency Synchronous Buck Converter With TPS43000 PWM Controller
1-MHz, 3.3-V, High-Efficiency Synchronous Buck
Converter With TPS43000 PWM Controller
Systems Powe
r
Contents
1 Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Design Procedure 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Test Results 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 PCB Layout 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 List of Materials 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Introduction
This full-featured controller is designed to drive a pair of external MOSFETs (N or P) and can be used with a
wide range of output voltages and power levels. It can be widely used in networking equipment, servers, PDAs,
cellular phones, and telecommunication applications. The datasheet describes the functionalities of the
controller in more detail.
A schematic of this board is shown in Figure 1. Recommended parts list is provided in Table 1. The layout of
the PCB board is shown in Figure 6.
The specification for this board is as follows:
D 4.5 V ≤ V
IN
≤ 8.5 V
D V
OUT
= 3.3 V
D 50 mA ≤ I
OUT
≤ 2 A, enters PFM at 200 mA, nominal current is 1 A
D Switching frequency, f
S
= 1 MHz
D Ripple = 1%
D Efficiency at nominal load > 90%