TPS5103 MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
D Step-Down DC-DC Converter D Three Operation-Modes
– Heavy Load:
– ...
TPS5103 MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
D Step-Down DC-DC Converter D Three Operation-Modes
– Heavy Load:
– Fixed Frequency PWM
– Hysteretic (User Selectable)
– Light Load:
– Skip Mode
D 4.5-V to 25-V Input
Voltage Range D Adjustable Output
Voltage Down to 1.2 V D 95% Efficiency D Standby Control D Overcurrent Protection D UVLO for Internal 5-V Regulation D Low-Standby Current . . . 0.5 mA Typical D TA = –40°C to 85°C
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
DB PACKAGE (TOP VIEW)
SOFTSTART 1 INV 2 FB 3 CT 4 RT 5
GND 6 REF 7 COMP 8 PWM/SKIP 9 STBY 10
20 LH 19 OUT_u 18 LL 17 OUT_d 16 OUTGND 15 TRIP 14 VCC_SENSE 13 VCC 12 VREF5 11 VREG5V_IN
description
The TPS5103 is a synchronous buck dc/dc controller, designed for notebook PC system power. The controller has three user-selectable operation modes available: hysteretic mode, fixed-frequency PWM control, or SKIP control.
In high-current applications, where fast transient response is advantageous for reducing bulk capacitance, the hysteretic mode is selected by connecting the RT pin to VREF5. Selecting the PWM/SKIP modes for less demanding transient applications is ideal for conserving notebook battery life under light load conditions. The device includes high-side and low-side
MOSFET drivers capable of driving low rds(on) N-channel
MOSFETs.
The user-selectable overcurrent protection (OCP) threshold is set by an external TRIP-pin resistor in order to protect the system. The TPS5103 is configured so that a cur...
