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TPS54900 Datasheet

  • TPS54900

  • 可編程四通道步降 DC/DC 轉(zhuǎn)換器

  • 16頁

  • TI

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TPS54900
(6,4 mm x 5,0 mm)
SLVS405 鈥?OCTOBER 2001
PROGRAMMABLE FOUR-CHANNEL STEP-DOWN
DC/DC CONVERTER
FEATURES
D
Four Independent 100-mA Channels
D
Programmable Over 4-Wire Serial Port
Converter Regulation Range:
7.5 V to 13.1 V in 400-mV Steps, Plus
Unregulated Pass-Through Mode to Shunt VIN
to any Output
Internally Compensated PWM Controller and
Integrated PMOS Power Switches
Global and Per Channel Status Available
Through Serial Port
External Synchronization of PWM With
System Clock
Per Channel Current Limit and Global Thermal
Shutdown
鈥?0擄C to 85擄C Ambient Temperature Range
DESCRIPTION
The TPS54900 four-channel step-down converter uses
voltage mode PWM control to provide four
independently programmable output voltages. Each
regulated channel includes a high-side PMOSFET
switch with a typical r
DS(ON)
of 0.8
鈩?
which makes it
suitable for high efficiency, low current applications.
Commands sent to the TPS54900 over the four-wire
serial port programs the outputs independently or
globally to supply voltages from 7.5 V to 13.1 V in 0.4-V
increments. When the input voltage is desired at an
output, a bypass mode can be activated which fully
enhances the PMOSFET switch and disables the
switching circuitry of the selected channel.
The TPS54900 is an ideal companion device to power
THS7102 ADSL line drivers as a part of the AC5 central
office ADSL chipset. With the AC5 chipset controlling
the TPS54900 output voltages, significant power
savings are realized by reducing the excess supply
headroom on a per line basis.
D
D
D
D
D
APPLICATIONS
D
ADSL Central Office Line Drivers
D
Software Line Card Provisioning
EFFICIENCY
vs
DRIVER SUPPLY VOLTAGE
100
Efficiency
90
Efficiency (%)
80
100
TSSOP (PW) PACKAGE
(TOP VIEW)
60
80
Driver Current
40
70
20
60
7
9
11
13
15
Driver Supply Voltage 鈥?V
0
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.
Driver Supply Current 鈥?mA
LX0
LX1
GND
SFS
SDI
EN
FB0
FB1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LX3
LX2
VIN
SDO
SCLK
CBS
FB3
FB2
Copyright
錚?/div>
2001, Texas Instruments Incorporated
www.ti.com
1

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