Step-Down Controller. TPS51120 Datasheet

TPS51120 Controller. Datasheet pdf. Equivalent

Part TPS51120
Description Synchronous Step-Down Controller
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TPS51120
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TPS51120
SLUS670C – JULY 2005 – REVISED JANUARY 2015
TPS51120 Dual, Synchronous Step-Down Controller With 100-mA Standby Regulators for
Notebook System Power
1 Features
1 3.3-V and 5-V 100-mA Bootstrapped Standby
Regulators with Independent Enables
• Selectable D-CAP™ 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 RDS(on) Loss-less Current Sensing
• RSENSE Accurate Current Sense Option
• Internal Soft-Start and Integrated VOUT Discharge
Transistors
• Integrated 2-V Reference
• Adaptive Gate Drivers with Integrated Boost Diode
• Powergood for Each Channel with Delay Timer
• Fault Disable Mode
• Supply Input Voltage Range: 4.5 V to 28 V
2 Applications
Notebook Computers System Bus and I/O
3 Description
The TPS51120 is a highly sophisticated dual,
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
downstream circuitry in a notebook computer system.
High-current, 100-mA, 5-V or 3.3-V on-board linear
regulators 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
compensation, ceramic output capacitors as well as
seamless transition to reduced frequency operation at
light-load condition. Optional D-CAP 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 5-V 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
–40°C to 85°C ambient temperature.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
TPS51120
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Reference Design for D-CAP Mode Converter
C31
1 nF
V5FILT
VO2
3.3V/6A
+
C2B
150 µF
R21
100 kΩ
EN_LDO5
P_GOOD2
EN_LDO3
VBAT
GND
8
7
6
5
4
3
2
1
R11
100 kΩ
9
EN5
10 EN3
32
SKIPSEL
TONSEL 31
GND
P_GOOD1
VBAT
11 PGOOD2
PGOOD1 30
C10
20 µF
L2
2.2 µH
C2A
150 µF
EN_2
12 EN2
Q3
IRF7821
C21
0.1 µF
13 VBST2
14 DRVH2
Q4
IRF7832
15 LL2
DRVL2
16
TPS51120RHB
(QFN−32)
PowerPAD
EN1 29
VBST1 28
DRVH1 27
LL1 26
DRVL1
25
EN_1
C11
0.1 µF
C10
20 µF
Q1
IRF7821
L1
4.7 µH
Q2
IRF7832
C1A
150 µF
+
VO1
5V/6A
C1B
150 µF
VO2_GND −
PGND2
17 18 19 20 21 22 23 24
R22
3.3 kΩ
C30
10 µF
R50
5.1Ω
C51
1 µF
R12
3.6 kΩ
C30
C50
NA
10 µF
VBAT
− VO1_GND
PGND1
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



TPS51120
TPS51120
SLUS670C – JULY 2005 – REVISED JANUARY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 Recommended Operating Conditions....................... 5
6.3 Thermal Information .................................................. 6
6.4 Electrical Characteristics.......................................... 6
6.5 Typical Characteristics ............................................ 10
7 Detailed Description ............................................ 15
7.1 Overview ................................................................. 15
7.2 Functional Block Diagram ....................................... 16
7.3 Feature Description................................................. 17
7.4 Device Functional Modes........................................ 22
7.5 Programming........................................................... 27
8 Application and Implementation ........................ 28
8.1 Application Information............................................ 28
8.2 Typical Application ................................................. 28
9 Power Supply Recommendations...................... 31
10 Layout................................................................... 31
10.1 Layout Guidelines ................................................. 31
10.2 Layout Example .................................................... 32
11 Device and Documentation Support ................. 33
11.1 Trademarks ........................................................... 33
11.2 Electrostatic Discharge Caution ............................ 33
11.3 Glossary ................................................................ 33
12 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (Feburary 2007) to Revision C
Page
• Added Pin Configuration and Functions section, Feature Description section, Device Functional Modes, Application
and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section ............................................................... 1
2
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