TPS53124 Datasheet, PDF (1/22 Pages) Texas Instruments – Dual Synchronous Step-Down Controller For Low-Voltage Power Rails

TPS53124
www.ti.com ..................................................................................................................................................... SLUS825B – FEBRUARY 2008 – REVISED MAY 2008
Dual Synchronous Step-Down Controller For Low-Voltage Power Rails
FEATURES
1
•2 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
APPLICATIONS
• Digital TV Power Supply
• Networking Home Terminal
• Digital STB
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.
TYPICAL APPLICATION DIAGRAM
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
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
PGND
13 14 15 16 17 18
R6
R3
C7
C8
4.7 uF
1 uF
PGND
PGND
SGND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DCAP is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated