Datasheet

TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240A – SEPTEMBER 1999 – REVISED MAY 2001
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME NO.
I/O
DESCRIPTION
COMP 8 I Comparator input for voltage monitor
C
T
4 I/O
External capacitor from C
T
to GND for adjusting the triangle oscillator and decreasing the current-limiting
voltage
FB 3 O Feedback output of error amp
GND 6 Control GND
INV 2 I Inverting input of both error amp and hysteretic comparator
LH 20 I/O Bootstrap. Connect a 1 µF, low-ESR capacitor from LH to LL.
LL 18 I/O
Bootstrap low. High-side gate driving return and output-current protection. Connect to the junction of the
high-side and low-side FETs for a floating drive configuration.
OUT_d 17 I/O Gate-drive output for low-side power switching FETs
OUTGND 16 Ground for FET drivers
OUT_u 19 O Gate-drive output for high-side power switching FETs
PWM/SKIP 9 I
PWM/SKIP mode select
L:PWM mode
H:SKIP mode
REF 7 O 1.185-V reference voltage output
R
T
5 I/O External resistor connection for adjusting the triangle oscillator.
SOFTSTART 1 I External capacitor from SOFTSTART to GND for soft-start control
STBY 10 I Standby control
TRIP 15 I External resistor connection for output-current control
V
CC
13 I Supply-voltage input
VCC_SENSE 14 I Supply voltage sense for current protection
VREF5 12 O 5-V internal regulator output
VREG5V_IN 11 I External 5-V input (input voltage range = 4.5 V to 25 V)