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TPPM0115 Datasheet

  • TPPM0115

  • SWITCH MODE SYNCHRONOUS BUCK CONTROLLER

  • 238.12KB

  • 13頁

  • TI

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TPPM0115
SWITCH MODE SYNCHRONOUS BUCK CONTROLLER
SLVS371A鈥?MARCH 2001 鈥?REVISED JUNE 2001
features
D
DC-DC Synchronous Buck Controller
D
Switching Frequency, 200 kHz (Typ)
D
Programmable Output Voltage,
D
D
D
SO (D) PACKAGE
(TOP VIEW)
1 V to 2.5 V
鹵
2%
Power Good Function (PWRGD)
Input Voltage, 12 V
鹵5%
Drive High Load Current With External
Components
V
CC
PWRGD
NC
PHASE
1
2
3
4
8
7
6
5
GND
SEN
DRVL
DRVH
NC 鈥?No internal connection
applications
D
PC Motherboard, Voltage Regulation for
D
D
D
System Power
DDR Memory Supply (V
DDQ
or V
TT
)
RDRAM Memory Supply (V
DDQ
)
General Purpose Synchronous Switch
Mode Controller
description
The TPPM0115 is a synchronous buck controller capable of driving two external power FETs 180擄 out of phase.
The device requires a minimum of external standard filter components and switching FETs to regulate the
desired output voltage. This is achieved with an internal switching frequency of 200 kHz (typical).
The TPPM0115 switch mode controller and associated circuitry provide efficient voltage regulation of greater
than 85%. The output voltage is set by two external resistors. During power up, when the output voltage reaches
90% of the desired value, the power good (PWRGD) output is transitioned high after a short delay of 1 ms to
5 ms. During power down, when the output voltage falls below 90% of the set value, the PWRGD output is pulled
low without any delay.
In the event the set output is in an over-voltage condition due to a system fault, the drive to the lower FET turns
on to correct the fault. There is a dead time between switching one FET ON while the other FET is switching
OFF to prevent cross conduction.
The TPPM0115 is capable of driving high static load currents with minimal ripple on the output (<2%). The phase
sense input is used to sense the flow of current through the inductor during flyback to minimize ripple on the
output.
To optimize output filter capacitance, the voltage mode control is based on a fixed ON time during the start of
the cycle and hysteretic control during load transients. This allows the device to respond and maintain the set
regulation voltage.
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.
Copyright
錚?/div>
2001, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1

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