TPS54495
www.ti.com
SLVSBH0 –JUNE 2012
4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
Check for Samples: TPS54495
1
FEATURES
APPLICATIONS
2
•
D-CAP2™ Control Mode
•
Point-of-Load Regulation in Low Power
Systems for Wide Range of Applications
–
–
Fast Transient Response
–
–
–
–
–
Digital TV Power Supply
Networking Home Terminal
Digital Set Top Box (STB)
DVD Player/Recorder
No External Parts Required For Loop
Compensation
–
Compatible with Ceramic Output
Capacitors
•
•
•
Wide Input Voltage Range : 4.5 V to 18 V
Output Voltage Range : 0.76V to 7.0V
Gaming Consoles and Other
DESCRIPTION
Highly Efficient Integrated FETs Optimized for
Low Duty Cycle Applications
The TPS54495 is a dual, adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54495
enables system designers to complete the suite of
various end equipment’s power bus regulators with a
cost effective, low component count, and low standby
current solution. The main control loops of the
TPS54495 use the D-CAP2™ mode control which
provides a very fast transient response with no
external compensation components. The adaptive on-
time control supports seamless transition between
PWM mode at higher load conditions and Eco-
mode™ operation at light loads. Eco-mode™ allows
the TPS54495 to maintain high efficiency during
lighter load conditions. The TPS54495 is able 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 4.5V to 18V.
–
90 mΩ (High Side) and 60 mΩ (Low Side)
•
•
High Initial Reference Accuracy
Supports Constant 4 A CH1 and 2 A CH2 Load
Current
•
•
•
•
•
•
•
•
Low-Side rDS(on) Loss-Less Current Sensing
Adjustable Soft Start
Non-Sinking Pre-Biased Soft Start
700 kHz Switching Frequency
Cycle-by-Cycle Over-Current Limit Control
OCL/UVLO/TSD Protections
Hiccup Timer for Overload Protection
Adaptive Gate Drivers with Integrated Boost
PMOS Switch
•
OCP Constant Due To Thermally Compensated
rDS(on) with 4000ppm/℃
The TPS54495 is available in a 4.4mm×5.0mm 16 pin
TSSOP (PWP) package, and is specified for an
ambient temperature range from –40°C to 85°C.
•
•
16-Pin HTSSOP
Auto-Skip Eco-mode™ꢀfor High Efficiency at
Light Load
Input Voltage
Vout2(50mV/div)
1
VIN2
VIN1
16
15
C11
2
3
VBST1
VBST2
C12
VO1
C32
L12
L11
VO2
C31
C41
SW2 14
SW1
C21
C22
4
5
PGND1
EN1
PGND213
EN2 12
TPS54495
Iout2(1A/div)
HTSSOP16
PGND
PGND
C42
C5
SS1
6
SS2 11
R11
R21
SGND
SGND
R12
VFB1
GND
10
VFB2
7
8
R22
9
100 ms/div
VREG5
PGND
SGND
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.
2
D-CAP2, Eco-mode, Eco-Mode are trademarks of Texas Instruments.
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 © 2012, Texas Instruments Incorporated