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TPS51020 Datasheet

  • TPS51020

  • 双路 DDR 可选同步降压控制器

  • 568.00KB

  • 27页

  • TI

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TPS51020
SLUS564B 鈭?JULY 2003 鈭?REVISED DECEMBER 2003
DUAL, VOLTAGE MODE, DDR SELECTABLE, SYNCHRONOUS,
STEP DOWN CONTROLLER FOR NOTEBOOK SYSTEM POWER
FEATURES
D
Wide Input Voltage Range: 4.5-V to 28-V
D
Selectable Dual and DDR Modes
D
Selectable Fixed Frequency Voltage Mode
D
Integrated Selectable Output Discharge
D
Advanced Power Good Logic Monitors both
D
D
D
D
D
D
D
D
D
Channels
Selectable Autoskip Mode
Integrated Boot Strap Diodes
180掳 Phase Shift Between Channels
Integrated 5-V, 60-mA Regulator
Input Feedforward Control
1% Internal 0.85-V Reference
R
DS(on)
Overcurrent Detection (4200 ppm/掳C)
Integrated OVP, UVP and Power Good Timers
30-pin TSSOP Package
DESCRIPTION
The TPS51020 is a multi-function dual-
synchronous step-down controller for notebook
system power. The part is specifically designed
for high performance, high efficiency applications
where the loss associated with a current sense
resistor is unacceptable. The TPS51020 utilizes
feed forward voltage mode control to attain high
efficiency without sacrificing line response.
Efficiency at light load conditions can be
maintained high as well by incorporating autoskip
operation. A selectable, Suspend to RAM (STR)
supported, DDR option provides a one chip
solution for all switching applications from
5-V/3.3-V supply to a complete DDR termination
solution.
ORDERING INFORMATION
TA
鈭?0掳C to 85掳C
PLASTIC TSSOP (DBT)
TPS51020DBT
TPS51020DBTR (T&R)
APPLICATIONS
D
Notebook Computers System Bus and I/O
D
DDR I or DDR II Termination
SIMPLIFIED
VO1
APPLICATION
DIAGRAM
VIN
VO1
1
INV1
TPS51020
2 COMP1
3 SSTRT1
4 SKIP
5
VO1_VDDQ
6 DDR
7 GND
8 REF_X
9 ENBL1
10 ENBL2
VO2
VREG5
11 VO2
12 PGOOD
13 SSTRT2
14 COMP2
VO2
15 INV2
VBST1 30
29
OUT1_U
28
LL1
27
OUT1_D
26
OUTGND1
TRIP1 25
VIN
TRIP2
VREG5
REG5_IN
OUTGND2
OUT2_D
LL2
OUT2_U
VBST2
24
23
22
21
20
19
18
17
16
VIN
VO1
VIN
VREG5
EXT_5V
VO2
UDG鈭?3144
VIN
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
铮?/div>
2003, Texas Instruments Incorporated
www.ti.com
1

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