TPS53128_15 Datasheet, PDF (1/35 Pages) Texas Instruments – TPS53128 Dual Synchronous Step-Down Controller With Auto-SkipEco-mode™ For Low Voltage Power Rails

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TPS53128
SLVSAE4A – JULY 2010 – REVISED AUGUST 2014
TPS53128 Dual Synchronous Step-Down Controller With
Auto-SkipEco-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 R_DS(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
I_TRIP
• 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
C８
C7
4.7uF
1uF
R３
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
R３
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
C８
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.