TPS53124_15 Datasheet, PDF (1/29 Pages) Texas Instruments – TPS53124 Dual Synchronous Step-Down Controller For Low-Voltage Power Rails

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TPS53124
SLUS825C – FEBRUARY 2008 – REVISED AUGUST 2014
TPS53124 Dual Synchronous Step-Down Controller
For Low-Voltage Power Rails
1 Features
•1 High Efficiency, Low-Power Consumption
• D-Cap Mode Enables Fast Transient Response
• High Initial Reference Accuracy
• 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
• Built-In 5-V Linear Regulator
2 Applications
• Digital TV Power Supply
• Networking Home Terminal
• Digital STB
3 Description
The TPS53124 is a dual, Adaptive on-time DCAP™
mode synchronous controller. The part enables
system designers to cost effectively complete the
suite of digital TV power bus regulators with the
absolute lowest external component count and lowest
standby consumption. The main control loop for the
TPS53124 uses the D-CAP™ mode that optimized
for low ESR output capacitors such as POSCAP or
SP-CAP promises fast transient response with no
external compensation. 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 TPS53124 is available in the 24-pin RGE
package and in the 28-pin PW package and is
specified from -40°C to 85°C ambient temperature
range.
Device Information⁽¹⁾
DEVICE NAME
PACKAGE
BODY SIZE
TPS53124
PW (28)
9.70 mm x 6.40 mm
TPS53124
QFN (24)
4.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematics
Input Voltage
C9
SGND
PGND
SGND
R5
R4
R2
R1
65 4 3 2 1
VO2
1.8V
C6
4.7uF
C4
Q3
L2
3.3uH
Q4
C5
0.1uF
PGND
7 _EN2
8 VBST2
9 DRVH2
10 _LL2
11 _DRVL2
12 PGND2
Power PAD
TPS53124RGE
(QFN24)
EN1 ²⁴
VBST1 23 _C2
0.1uF
DRVH1 22
LL1 21
DRVL120
PGND1 ₁₉
C3
4.7uF
Q1
L1
3.3uH
Q2
VO1
1.05 V
C1
13 14 15 16 17 18
R6
R3
C7
C8
4.7 uF
1 uF
PGND
PGND
SGND
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.