TPS53126_15 Datasheet, PDF (1/33 Pages) Texas Instruments – TPS53126 Dual Synchronous Step-down Controller For Low Voltage Power Rails

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TPS53126
SLUS909B – MAY 2009 – REVISED AUGUST 2014
TPS53126 Dual Synchronous Step-down Controller 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
• Internal 1.2 ms Voltage-Servo Soft Start
• Pre-Biased Soft Start
• Selectable Switching Frequency: 350 kHz / 700
kHz
• 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
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 and Other
3 Description
The TPS53126 is a dual, adaptive on-time, D-
CAP2™ mode synchronous Buck controller. The
TPS53126 enables system designers to complete the
suite of various end equipment's power bus
regulators with a cost effective, low external
component count, and low standby current solution.
The main control loop for the TPS53126 uses the D-
CAP2™ mode control which provides a very fast
transient response with no external components. The
TPS53126 also has a proprietary circuit that enables
the device to adapt to both low equivalent series
resistance (ESR) output capacitors, such as
POSCAP or SP-CAP, and ultra-low ESR ceramic
capacitors. The device provides convenient and
efficient operation with input voltages from 4.5 V to 24
V and output voltages from 0.76 V to 5.5 V.
The TPS53126 is available in 4mm x 4mm 24 pin
VQFN (RGE) or 24 pin TSSOP (PW) packages and is
specified from –40°C to 85°C ambient temperature
range.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS53126
VQFN (24)
4.00 mm x 4.00 mm
TPS53126
TSSOP (24)
7.80 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematics
Input Voltage
4.5V to 24V
C9
10mF
PGND
R4
R5
3.52kW 10kW
SGND
R2
R1
10kW 13kW
65 4 3 2 1
C6
10mF
VO2
1.05V/4A
C4
22mF ´ 4
Q3
FDS8878
L2
SPM6530T
1.5mH
Q4
FDS8690
C5
0.1mF
7 EN2
8 VBST2
9 DRVH2
10 SW2
11 DRVL2
12 PGND2
PowerPAD
TPS53126
RGE
(QFN)
EN1 24
VBST1 23
DRVH1 22
SW1 21
DRVL1 20
PGND1 19
PGND
13 14 15 16 17 18
R6
3.3kW
C8
C7
1mF
4.7mF
R3
4.7kW
PGND
SGND
C2
0.1mF
Q1
FDS8878
L1
SPM6530T
1.5mH
Q2
FDS8690
C3
10mF
VO1
1.8V/4A
C1
22mF ´ 4
PGND
R1
13kW
R2
10kW
R5
10kW
SGND
R4
3.52kW
1 DRVH1
2 VBST1
3 EN1
4 VO1
5 VFB1
6 GND
7 TEST1
8 VFB2
9 VO2
10 EN2
11 VBST2
12 DRVH2
TPS53126
PW
(TSSOP)
C2
0.1mF
SW1 24
DRVL1 23
PGND1 22
TRIP1 21
R3
3.3kW
VIN 20
VREG5 19
C7
4.7mF
V5FILT 18
TEST2 17
TRIP2 16
C8
1mF
R6
4.3kW
PGND2 15
DRVL2 14
SW2 13
C5
0.1mF
Q1
FDS8878
L1
SPM6530T
1.5mH
Q2
FDS8690
C3
10mF
VO1
1.8V/4A
C1
22mF ´ 4
PGND
C9
10mF
PGND
Input Voltage
4.5V to 24V
SGND
Q4
FDS8690
C4
PGND
22mF ´ 4
L2
SPM6530T
1.5mH
Q3
FDS8878
C6
10mF
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.