TPS53125_15 Datasheet, PDF (1/33 Pages) Texas Instruments – TPS53125 Dual Synchronous Step-Down Controller for Low Voltage Power Rails

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TPS53125
SLVS947C – OCTOBER 2009 – REVISED AUGUST 2014
TPS53125 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
• 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
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
3 Description
The TPS53125 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 TPS53125 uses the D-CAP™ Mode topology
which provides a very fast transient response with no
external component.
The TPS53125 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
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 TPS53125 is available in 24-pin RGE and PW
packages, and is specified from –40°C to 85°C
ambient temperature range.
Device Information⁽¹⁾
DEVICE NAME
PACKAGE
BODY SIZE
TPS53125
VQFN (24)
TSSOP (24)
4 mm x 4 mm
4.4 mm x 7.8 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematics
Input Voltage
4.5 V to 24 V
C9
10 µF
PGND
R5
R4 _{10 kΩ}
3.52 kΩ
C10
4700 pF
R2
10 kΩ
SGND
R1 13 kΩ
65 43 2 1
VO2
1.05V/4A
C6
10 µF
Q3
FDS8878
L2
SPM6530T
1.5 µH
Q4
FDS8690
C5
0.1 µF
7 EN2
8 VBST2
9 DRVH2
10 SW2
11 DRVL2
12 PGND2
Power PAD
TPS53125 RGE
(QFN )
EN1 24
VBST1 23
DRVH1 22
SW1 21
DRVL1 20
PGND1 ₁₉
C4
22 µFx4
PGND
13 14 15 16 17 18
R6
C８
4.3 k Ω
1µF
C11
C7
4.7µF
4700 pF
PGND
R３
3.3 kΩ
SGND
C2
0.1µF
Q1
FDS8878
L1
SPM6530T
1.5 µH
Q2
FDS8690
C3
10 µF
VO1
1.8 V/4A
C1
22 µFx4
PGND
1 DRVH1
2 VBST1
R1
13 kΩ
R2
13 kΩ
3 EN1
4 VO1
5 VFB1
6 GND
R5
10 kΩ
C10
SGND 4700 pF
7 SS1
8 VFB2
R4
3.52 kΩ
9 VO2
10 EN2
11 VBST2
12 DRVH2
TPS53125PW
TSSOP24
C2
0.1 µF
SW1 24
DRVL1 23
PGND1 22
TRIP1 21
R3
3.3 kΩ
VIN 20
VREG5 19
C7
4.7 µF
Q1
FDS8878
L1
SPM 6530T
1.5 µH
Q2
FDS8878
C3
10 µF
VO1
1.8 V/4A
C1
22 µFx4
PGND
C9
10 µF
Input Voltage
4.5 V to 24 V
V5FILT 18
SS2 17
TRIP2 16
PGND2 15
DRVL2 14
SW2 13
C8
1 µF
R6
4.3 kΩ
C11
4700 pF
PGND
SGND
Q4
FDS8690
C5
0.1 µF
L2
SPM6530T
1.5 µH
Q3
FDS8878
C4 ^PGND
22 µFx4
VO2
1.05 V/4A
C6
10 µF
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.