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TPS51120 Datasheet

  • TPS51120

  • 用于笔记本电源的具有 100mA 待机寄存器的双电流模式同步步降控...

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  • TI

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TPS51120
www.ti.com
SLUS670A 鈥?JULY 2005 鈥?REVISED AUGUST 2005
DUAL CURRENT MODE, SYNCHRONOUS STEP-DOWN CONTROLLER WITH 100-mA
STANDBY REGULATORS FOR NOTEBOOK SYSTEM POWER
FEATURES
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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3.3-V and 5-V 100-mA Bootstrapped Standby
Regulators with Independent Enables
Selectable D-CAP
庐
Mode Enables Fast
Transient Response Less than 100 ns
Selectable Low Ripple Current Mode
Less than 1% Internal Reference Accuracy
Selectable PWM-only/Auto-skip Modes
Low-side R
DS(on)
Loss-less Current Sensing
R
SENSE
Accurate Current Sense Option
Internal Soft-start and Integrated V
OUT
Discharge Transistors
Integrated 2-V Reference
Adaptive Gate Drivers with Integrated Boost
Diode
Power Good for Each Channel with Delay
Timer
Fault Disable Mode
Supply Input Voltage Range: 4.5 V to 28 V
DESCRIPTION
The TPS51120 is a highly sophisticated dual current
mode synchronous step-down controller. It is a full
featured controller designed to run directly off a three-
or four-cell Li-ion battery and provide high-power and
5-V and/or 3.3-V standby regulation for all the down-
stream circuitry in a notebook computer system. High
current, 100-mA, 5-V or 3.3-V on-board linear regu-
lators have glitch-free switch over function to SMPS
and can be kept alive independently during standby
state. The pseudo-constant frequency adaptive
on-time control scheme supports full range of current
mode operation including simplified loop compen-
sation, ceramic output capacitors as well as seamless
transition to reduced frequency operation at light-load
condition. Optional D-CAP鈩?mode operation
optimized for SP-CAP or POSCAP output capacitors
allows further reduction of external compensation
parts. Dynamic UVP supports VIN line sag without
latch off by hitting 5V UVP. No negative voltage
appears at output voltage node during UVLO, UVP,
and OCP, OTP or loss of VIN.
The TPS51120 32-pin QFN package is specified from
鈥?0掳C to 85掳C ambient temperature.
APPLICATIONS
鈥?/div>
Notebook Computers System Bus and I/O
C31
1 nF
V5FILT
COMP1
VREF2
COMP2
EN_LDO5
P_GOOD2
EN_LDO3
VBAT
9
VFB2
VFB1
GND
VO2
VO1
R21
100 k鈩?/div>
GND
8
7
6
5
4
3
2
1
32
GND
R11
100 k鈩?/div>
P_GOOD1
VBAT
EN5
SKIPSEL
10 EN3
11 PGOOD2
EN_2
12 EN2
13 VBST2
C21
0.1
碌F
14 DRVH2
15 LL2
VREG3
16
V5REG
V5FILT
DRVL2
PGND2
CS2
TPS51120RHB
(QFN鈭?2)
TONSEL 31
PGOOD1 30
EN1 29
VBST1 28
DRVH1 27
LL1 26
PGND1
DRVL1
25
EN_1
C11
0.1
碌F
C10
20
碌F
L2
2.2
碌H
VO2
3.3V/6A
+
C2B
150
碌F
C2A
150
碌F
C10
20
碌F
Q1
IRF7821
Q3
IRF7821
L1
4.7
碌H
+
VO1
5V/6A
Q4
IRF7832
PowerPAD
CS1
Q2
IRF7832
C1A
150
碌F
C1B
150
碌F
17
18
19
20
21
VIN
22
23
24
鈭?/div>
PGND1
VO1_GND
VO2_GND
鈭?/div>
PGND2
R22
3.3 k鈩?/div>
R50
5.1W
R12
3.6 k鈩?/div>
C30
NA
UDG鈭?5074
VBAT
C30
10
碌F
C51
1
碌F
C50
10
碌F
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.
D-CAP is a registered trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright 漏 2005, Texas Instruments Incorporated

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