TPS65276_15 Datasheet, PDF (1/33 Pages) Texas Instruments – 4.5-V TO 18-V INPUT VOLTAGE, 6-A/3.5-A DUAL SYNCHRONOUS STEP-DOWN CONVERTER

TPS65276
www.ti.com
SLVSC83A – AUGUST 2013 – REVISED DECEMBER 2013
4.5-V TO 18-V INPUT VOLTAGE, 6-A/3.5-A DUAL SYNCHRONOUS STEP-DOWN
CONVERTER
Check for Samples: TPS65276
FEATURES
1
• 4.5-V to 18-V Wide Input Voltage Range
• Programmable Slew Rate Control for Output
Voltage Transition
• Up to 6-A Maximum Continuous Output
Current in Buck 1 and 3.5-A in Buck 2
• Pulse Skipping Mode to Achieve High
Efficiency in Light Load
• Adjustable Switching Frequency
200 kHz - 1.6 MHz Set by External Resistor
• Dedicated Enable and Soft-Start for Each Buck
• Peak Current-Mode Control with Simple
Compensation Circuit
• Cycle-by-Cycle Over Current Protection
• 180° Out-of-Phase Operation to Reduce Input
Capacitance and Power Supply Induced Noise
• Over Temperature Protection
• Available in 32-Pin Thermally Enhanced
HTSSOP (DAP) and 36-Pin QFN 6-mm x 6-mm
(RHH) Packages
APPLICATIONS
• DTV
• Telecom and Network
• Point-of-Load
• Set Top Boxes
• Tablet PC
DESCRIPTION
TPS65276 is a monolithic dual synchronous buck converter with wide 4.5-V to 18-V operating input voltage
range that encompassed most intermediate bus voltage operating off 5-, 9-, 12- or 15-V power bus or battery.
The converter with constant frequency peak current mode control is designed to simplify its application while
giving the designers options to optimize their usage according to the target applications.
TPS65276 features dedicated enable pin. Independent soft-start pin provides flexibility in power up
programmability. Constant frequency peak current mode control simplifies the compensation and provides fast
transient response. Cycle-by-cycle over current protection and hiccup mode operation limit MOSFET power
dissipation in short circuit or over loading fault conditions. Low side reverse over current protection also prevents
excessive sinking current from damaging the converter. TPS65276 also features a light load pulse skipping mode
(PSM) controlled by MODE pin configuration.
100
R1
EN1 ^{TPS 65276 FB2}
90
R32
EN2
RLIM2
80
R2
PGND2
BST2
R31 ^C29
70
C30 L2
C3
PVIN2
LX2
60
VOUT2
PVIN2
LX2
50
ISHARE
COMP2
R26 ^C26
40
C9
R24
30
V7V
ROSC
20
VIN
COMP1
Forced PWM
VIN
R23 C23
10
PVIN1
LX1
Auto PSM-PWM
L1
VOUT 1
0
DVCC ^C14
PVIN1
LX1
0
1
2
3
4
5
C19
R16 R15
PGND1
BST1
R18
C20
Loading (A)
C009
PGOOD1
RLIM1
R17
PGOOD2
FB1
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 © 2013, Texas Instruments Incorporated