TPS54495 Datasheet, PDF (1/23 Pages) Texas Instruments – 4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET

TPS54495
www.ti.com
SLVSBH0 – JUNE 2012
4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
Check for Samples: TPS54495
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
– 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 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/UVLO/TSD Protections
• Hiccup Timer for Overload Protection
• 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 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.
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.
Input Voltage
Vout2(50mV/div)
1 VIN1
VIN2 16
VO1
R11
R21
C11
L11
C21
PGND
SGND
2 VBST1
C31
3 SW1
4 PGND1
5 EN1
C41
6 SS1
7 VFB1
8 GND
TPS54495
HTSSOP16
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
Iout2(1A/div)
100 ms/div
SGND
PGND
SGND
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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.
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 © 2012, Texas Instruments Incorporated