TPS53321RGTR Datasheet, PDF (1/25 Pages) Texas Instruments – 5-A Step-Down Regulator with Integrated Switcher

www.ti.com
5-A Step-Down Regulator with Integrated Switcher
Check for Samples: TPS53321
TPS53321
SLUSAF3 – DECEMBER 2010
FEATURES
1
•2 96% Maximum Efficiency
• Continuous 5-A Output Current
• Supports All MLCC Output Capacitor
• SmoothPWM™ Auto-Skip Eco-mode™ for
Light-Load Efficiency
• 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
• Supports Pre-bias Start-Up
LOW VOLTAGE APPLICATIONS
• 5-V Step-down Rail
• 3.3-V Step-down Rail
DESCRIPTION
The TPS53321 provides a fully integrated 3-V to 5-V
V_IN integrated synchronous FET converter solution
with 16 total components, in 200 mm² of PCB area.
Due to the low on-resistance and TI's Proprietary
SmoothPWM™ Skip mode of operation, it enables
96% peak efficiency, and over 90% efficiency at
loads as light as 100 mA. It requires only two 22-µF
ceramic output capacitors for a power dense 5-A
solution.
The TPS53321 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 TPS53321 is available in the 3 mm × 3 mm
16-pin QFN package (Green RoHs compliant and Pb
free) 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
TPS53321
PGD 3
FB 10
8 PS
COMP 9
PGND PGND Pad
15 16
Output All MLCCs
C_BST
V_IN
PGD
UDG-10204
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.
SmoothPWM, Eco-mode are trademarks 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