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TPS53128 Datasheet Preview

TPS53128 Datasheet

Dual Synchronous Step-Down Controller

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TPS53128
SLVSAE4A – JULY 2010 – REVISED AUGUST 2014
TPS53128 Dual Synchronous Step-Down Controller With
Auto-Skip Eco-mode™ For Low Voltage Power Rails
1 Features
1 D-CAP2™ Mode Control
– Fast Transient Response
– No External Parts Required for Loop
Compensation
– Compatible With Ceramic Output Capacitors
• High Initial Reference Accuracy (±1%)
• Low Output Ripple
• Wide Input Voltage Range: 4.5 V to 24 V
• Output Voltage Range: 0.76 V to 5.5 V
• Low-Side RDS(ON) Loss-Less Current Sensing
• Adaptive Gate Drivers with Integrated Boost Diode
• Adjustable Soft Start
• Non-Sinking Pre-Biased Soft Start
• 350-kHz Switching Frequency
• Cycle-by-Cycle Over-Current Limiting Control
• 30-mV to 300-mV OCP Threshold Voltage
• Thermally Compensated OCP by 4000 ppm/°C at
ITRIP
• Auto-Skip Eco-mode™ for High Efficiency at Light
Load
2 Applications
• Point-of-Load Regulation in Low Power Systems
for Wide Range of Applications
– Digital TV Power Supply
– Networking Home Terminal
– Digital Set-Top Box (STB)
– DVD Player/Recorder
– Gaming Consoles
Input Voltage
4.5V to 24V
C9
10uF
PGND
R4
3.52kΩ
R5
10kΩ
C10
4700pF
R2
10kΩ
SGND
R1
13kΩ
65 4 3 21
VO2
1.05V/4A
C6
10uF
Q3
FDS8878
L2
SPM6530T
1.5uH
Q4
FDS8690
C5
0.1uF
7 EN2
8 VBST2
9 DRVH2
10 SW2
11 DRVL2
12 PGND2
Power PAD
TPS53128 RGE
(QFN )
EN1 24
VBST1 23
DRVH1 22
SW1 21
DRVL1 20
PGND1 19
C4
22uFx4
PGND
13 14 15 16 17 18
R6
4.3kΩ
C
C7
4.7uF
1uF
R
3.3kΩ
C11
4700pF
PGND
SGND
C2
0.1uF
Q1
FDS8878
L1
SPM6530T
1.5uH
L1
Q2
FDS8690
C3
10uF
VO1
1.8V/4A
PGND
C1
22uFx4
3 Description
The TPS53128 is a dual, adaptive on-time D-CAP2™
mode synchronous buck controller. The part enables
system designers to cost effectively complete the
suite of various end equipment's power bus
regulators with a low external component count and
low standby consumption. The main control loop for
the TPS53128 uses the D-CAP2™ Mode topology
which provides a very fast transient response with no
external component.
The TPS53128 also has a proprietary circuit that
enables the device to adapt not only low equivalent
series resistance (ESR) output capacitors such as
POSCAP/SP-CAP, but also ceramic capacitor. The
fixed frequency emulated adaptive on-time control
supports seamless operation between PWM mode at
heavy load condition and reduced frequency
operation at light load for high efficiency down to
milliampere range. The part provides a convenient
and efficient operation with conversion voltages from
4.5 V to 24 V and output voltage from 0.76 V to
5.5 V.
The TPS53128 is available in 4-mm x 4-mm 24 pin
QFN (RGE) or 24 pin TSSOP (PW) packages, and is
specified from -40°C to 85°C ambient temperature
range.
Table 1. Device Information(1)
DEVICE NAME
TPS53128
PACKAGE
VQFN (24)
TSSOP (24)
BODY SIZE
4.4 mm x 7.8 mm
4 mm x 4 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
1 DRVH1
2 VBST1
R1
13kΩ
R2
10kΩ
3 EN1
4 VO1
5 VFB1
6 GND
R5
10kΩ
C10
SGND4700pF
R4
3.52kΩ
7 SS1
8 VFB2
9 VO2
10 EN2
11 VBST2
12 DRVH2
TPS53128PW
TSSOP24
C2
0.1uF
SW1 24
DRVL1 23
PGND1 22
TRIP1 21
R
3.3kΩ
Q1
FDS8878
L1
SPM6530T
1.5uH
C3
10uF
Q2
FDS8690
VIN 20
VREG5 19
V5FILT 18
SS2 17
TRIP2 16
PGND2 15
DRVL2 14
SW2 13
C7
4.7uF
C
1uF
C11
4700pF
R6
4.3kΩ
C9
10uF
PGND
SGND
Q4
FDS8690
C5
0.1uF
L2
SPM6530T
1.5uH
Q3
FDS8878
C6
10uF
VO1
1.8V/4A
C1
22uFx4
PGND
Input Voltage
4.5V to 24V
PGND
C4
22uFx4
VO2
1.05V/4A
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.




etcTI

TPS53128 Datasheet Preview

TPS53128 Datasheet

Dual Synchronous Step-Down Controller

No Preview Available !

TPS53128
SLVSAE4A – JULY 2010 – REVISED AUGUST 2014
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......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 Handling Ratings ...................................................... 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 14
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Application ................................................. 15
9 Power Supply Recommendations...................... 23
10 Layout................................................................... 24
10.1 Layout Guidelines ................................................. 24
10.2 Layout Example .................................................... 24
11 Device and Documentation Support ................. 25
11.1 Trademarks ........................................................... 25
11.2 Electrostatic Discharge Caution ............................ 25
11.3 Glossary ................................................................ 25
12 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (July 2010) to Revision A
Page
• Changed format to meet latest data sheet standards; added new sections and moved existing sections............................ 1
• Added Eco-mode bullet to Features ....................................................................................................................................... 1
• Added QFN and TSSOP schematics .................................................................................................................................... 1
• Added V(ESD) value ................................................................................................................................................................. 4
• Added thermal information .................................................................................................................................................... 5
• Changed min for VVREG5 ........................................................................................................................................................ 5
• Changed max for RDRVL at -100 mA ...................................................................................................................................... 5
• Changed the I(SSC) Min value From: -1.5 to -2.5 μA and the Max value From: -2.5 To: -1.5 μA ....................................... 6
• Added Overview section. ..................................................................................................................................................... 10
• Added Device Functional Modes ......................................................................................................................................... 14
• Added Design Parameter values ......................................................................................................................................... 16
• Added Power Supply Recommendations ............................................................................................................................ 23
• Added Layout Example image.............................................................................................................................................. 24
2 Submit Documentation Feedback
Copyright © 2010–2014, Texas Instruments Incorporated


Part Number TPS53128
Description Dual Synchronous Step-Down Controller
Maker etcTI
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