TPS51020 Datasheet, PDF (1/27 Pages) Texas Instruments – DUAL, VOLTAGE MODE, DDR SELECTABLE, SYNCHRONOUS, STEP-DOWN CONTROLLER FOR NOTEBOOK SYSTEM POWER

TPS51020
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SLUS564B − JULY 2003 − REVISED DECEMBER 2003
DUAL, VOLTAGE MODE, DDR SELECTABLE, SYNCHRONOUS,
STEPĆDOWN CONTROLLER FOR NOTEBOOK SYSTEM POWER
FEATURES
DESCRIPTION
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
Channels
D Selectable Autoskip Mode
D Integrated Boot Strap Diodes
D 180° Phase Shift Between Channels
D Integrated 5-V, 60-mA Regulator
D Input Feedforward Control
D 1% Internal 0.85-V Reference
D R_DS(on) Overcurrent Detection (4200 ppm/°C)
D Integrated OVP, UVP and Power Good Timers
D 30-pin TSSOP Package
APPLICATIONS
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
−40°C to 85°C
PLASTIC TSSOP (DBT)
TPS51020DBT
TPS51020DBTR (T&R)
D Notebook Computers System Bus and I/O
D DDR I or DDR II Termination
VIN
SIMPLIFIED ^VO1
APPLICATION
DIAGRAM
VO1
VIN
VO2
VREG5
VO2
1 _INV1
TPS51020 _{VBST1 30}
2 _COMP1
OUT1_U ²⁹
3 _SSTRT1
LL1 ²⁸
4 _SKIP
OUT1_D ²⁷
5 _{VO1_VDDQ}
OUTGND1 ²⁶
6 _DDR
TRIP1 ²⁵
7 _GND
VIN ²⁴
8 _{REF_X}
9 _ENBL1
10 _ENBL2
TRIP2 23
22
VREG5
21
REG5_IN
11 _VO2
OUTGND2 ²⁰
12 _PGOOD
OUT2_D ¹⁹
13 _SSTRT2
LL2 ¹⁸
14 _COMP2
OUT2_U ¹⁷
15 _INV2
VBST2 ¹⁶
EXT_5V
VIN
VO1
VIN
VREG5
VO2
UDG−03144
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.
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Copyright  2003, Texas Instruments Incorporated
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