TPS5140_15 Datasheet, PDF (1/61 Pages) Texas Instruments – FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER

TPS5140
FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER
SLVS305A – DECEMBER 2000 – REVISED JANUARY 2001
D Three Independent Step-Down DC/DC
PAG PACKAGE
Controllers and One 12-V Boost DC/DC
(TOP VIEW)
Converter
D 4.5 V – 28 V Input Voltage Range
D Step-Down Controller Output Voltages
Adjustable Down to 1.2 V
D Synchronous-Buck Operation for High
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
Efficiency
FB1 1
48 LH2
D PWM Mode Control
SOFTSTART1 2
NC 3
47 NC
46 VCC
D Auto PWM/SKIP Mode for High
INV2 4
45 NC
Efficiency Under All Load Conditions
D High Speed Error Amplifier
FB2 5
SOFTSTART2 6
PWM_SEL 7
44 VREF3.3
43 VREF5
42 REG5V_IN
D Separate Standby Control and Over
Ct 8
GND 9
Current Protection for Each Channel
REF 10
D Over Voltage and Under Voltage
STBY_VREF3.3 11
Protection
STBY_VREF5 12
STBY1 13
D Programmable Short Circuit Protection
STBY2 14
41 NC
40 GND_UP
39 LL_UP
38 IN_12V
37 OUT_12V
36 NC
35 VCC_SENSE3
D Power Good With Programmable Delay
Time
STBY12V
STBY3
15
34
16
33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
TRIP3
NC
D 5 V and 3.3 V Linear Regulators
description
The TPS5140 is a dc/dc controller that incorporates three synchronous-buck controllers and one
nonsynchronous 12-V boost converter on one chip to power the voltage rails needed by notebook peripheral
components. On-chip high-side and low-side synchronous rectifier drivers are integrated to drive less expensive
N-channel power MOSFETs. The nonsynchronous boost converter includes the N channel power MOSFET and
supports 120 mA for the PCMCIA power supply. The outputs are controlled independently and two of the
synchronous-buck controllers operate 180 degrees out of phase, with the third lowering the input current ripple
and allowing a smaller input capacitance to reduce power supply cost. For higher efficiency under all load
conditions, the TPS5140 automatically adjusts each channel from the PWM mode to the skip mode
independently. The skip mode enables a lower operating frequency and shortens the pulse width to the low side
MOSFETs, thereby increasing the efficiency under light load conditions. To further extend battery life, the
TPS5140 features dead-time control and very low quiescent current. Resistorless current protection and the
fixed high-side driver voltage simplify the system design and reduce the external parts count.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  2001, Texas Instruments Incorporated
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