TPS53311 Datasheet, PDF (1/22 Pages) Texas Instruments – 3-A Step-Down Regulator with Integrated Switcher

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3-A Step-Down Regulator with Integrated Switcher
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TPS53311
SLUSA41 – JUNE 2010
FEATURES
1
•2 TI Proprietary Integrated MOSFET and
Packaging Technology
• Continuous 3-A Output Current
• Supports All MLCC Output Capacitor
• Supports Skip Mode for Light Load Control
• Optimized Efficiency at Light and Heavy Loads
• Voltage Mode Control
• Supports Master-Slave Interleaved Operation
• Synchronization up to ±20% of Nominal
Frequency
• Conversion Voltage Range Between 2.9 V and
6.0 V
• Soft-Stop Output Discharge During Disable
• Adjustable Output Voltage Ranging Between
0.6 V and 0.84 V × V_IN
• Overcurrent, Overvoltage and
Over-Temperature Protection
• Small 3 × 3 , 16-Pin QFN Package
• Open-Drain Power Good Indication
• Internal Boot Strap Switch
• Low R_DS(on), 24 mΩ with 3.3-V Input and 19-mΩ
with 5-V Input
LOW VOLTAGE APPLICATIONS
• 5-V Step-down Rail
• 3.3-V Step-down Rail
DESCRIPTION
TPS53311 is a fully integrated synchronous buck
regulator using the TI's proprietary SmoothPMW™
voltage mode control. It is designed for 3.3-V and 5-V
step-downs where system size is at a premium, and
where performance and optimized component lists
are mandatory.
The TPS53311 features a 1.1-MHz switching
frequency, SKIP mode operation support, pre-bias
startup, internal softstart, output soft discharge,
internal VBST switch, power good, EN/input UVLO,
overcurrent, overvoltage, undervoltage and
over-temperature protections and all ceramic output
capacitor support. It supports supply voltage from
2.9 V to 3.5 V and conversion voltage from 2.9 V to
6.0 V, and output voltage is adjustable from 0.6 V to
0.84 V × V_IN.
The TPS53311 is available in the 3 mm × 3 mm
16-pin QFN package (Green RoHs compliant and Pb
free) with TI proprietary Integrated MOSFET and
packaging technology and operates between –40°C
and 85°C.
TYPICAL APPLICATION CIRCUIT
V_IN
2.9 V to 6 V
V_DD
2.9 V to 3.5 V
SYNC
EN
13
VIN
12 VDD
11 AGND
14 5 6 7
VIN SW SW SW
VBST 4
2 SYNC
1 EN
TPS53311
PGD 3
FB 10
8 PS
COMP 9
PGND PGND Pad
15 16
Output All MLCCs
C_BST
V_IN
PGD
UDG-10027
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.
SmoothPMW 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 © 2010, Texas Instruments Incorporated