TPS54295 Datasheet, PDF (1/24 Pages) Texas Instruments – 2A Dual Channel Synchronous Step-Down Switcher with Integrated FET ( SWIFT™)

TPS54295
www.ti.com
SLVSB01B – OCTOBER 2011 – REVISED DECEMBER 2011
2A Dual Channel Synchronous Step-Down Switcher with Integrated FET ( SWIFT™)
Check for Samples: TPS54295
FEATURES
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•2 D-CAP2™ Control Mode
– Fast Transient Response
– 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
• Highly Efficient Integrated FETs Optimized for
Low Duty Cycle Applications
– 150 mΩ (High Side) and 100 mΩ (Low Side)
• High Initial Reference Accuracy
• Low-Side r_DS(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/OVP/UVP/UVLO/TSD Protections
• Adaptive Gate Drivers with Integrated Boost
PMOS Switch
• OCP Constant Due To Thermally Compensated
r_DS(on) with 4000ppm/℃
• 16-Pin HTSSOP
• Auto-Skip Eco-mode™　for High Efficiency at
Light Load
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
DESCRIPTION
The TPS54295 is a dual, adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54295
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
TPS54295 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 TPS54295 to maintain high efficiency
during lighter load conditions. The TPS54295 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.
The TPS54295 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.
Input Voltage
1 VIN1
VO1
C11
L11
C21
2 VBST1
C31
3 SW1
4 PGND1
R11
R21
PGND
5 EN1
C41
6 SS1
SGND
7 VFB1
8 GND
SGND
TPS54295
HTSSOP16
VIN2 16
VBST2 15
C32
SW2 ¹⁴
PGND2 ¹³
EN2 12
C42
SS2 11
VFB2 10
C5
VREG5 ⁹
C12
L12
VO2
C22
PGND
SGND
R12
R22
PGND
SGND
V_O2 = 1.5 V (50 mV/div)
Iout (1 A/div)
t - Time - 100 ms/div
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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.
SWIFT, D-CAP2, Eco-mode, Eco-Mode are trademarks of Texas Instruments.
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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 © 2011, Texas Instruments Incorporated