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TPS5140 Datasheet

  • TPS5140

  • FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER

  • 59頁

  • TI

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TPS5140
FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER
SLVS305A 鈥?DECEMBER 2000 鈥?REVISED JANUARY 2001
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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
鈥?/div>
DALLAS, TEXAS 75265
PGOUT
PG鈥揇ELAY
NC
EXT_PG
OFTSTART_12V
PHASE_12V
SOFTSTART3
FB3
INV3
NC
LH3
OUT3_u
LL3
OUT3_d
OUTGND3
Copyright
錚?/div>
2001, Texas Instruments Incorporated
SCP
Three Independent Step-Down DC/DC
Controllers and One 12-V Boost DC/DC
Converter
4.5 V 鈥?28 V Input Voltage Range
Step-Down Controller Output Voltages
Adjustable Down to 1.2 V
Synchronous-Buck Operation for High
FB1
Efficiency
SOFTSTART1
PWM Mode Control
NC
INV2
Auto PWM/SKIP Mode for High
FB2
Efficiency Under All Load Conditions
SOFTSTART2
PWM_SEL
High Speed Error Amplifier
Ct
Separate Standby Control and Over
GND
Current Protection for Each Channel
REF
STBY_VREF3.3
Over Voltage and Under Voltage
STBY_VREF5
Protection
STBY1
STBY2
Programmable Short Circuit Protection
STBY12V
Power Good With Programmable Delay
STBY3
Time
5 V and 3.3 V Linear Regulators
PAG PACKAGE
(TOP VIEW)
INV1
NC
NC
LH1
OUT1_u
LL1
NC
OUT1_d
OUTGND1
TRIP1
V CC _SENSE12
TRIP2
OUTGND2
OUT2_d
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LL2
OUT2_u
LH2
NC
VCC
NC
VREF3.3
VREF5
REG5V_IN
NC
GND_UP
LL_UP
IN_12V
OUT_12V
NC
VCC_SENSE3
TRIP3
NC
1

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