TPS65252 Datasheet, PDF (1/29 Pages) Texas Instruments – 4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN DUAL BUCK SWITCHER WITH INTEGRATED FET AND ONE USB SWITCH AND SVS

TPS65252
www.ti.com
SLVSAM1B – DECEMBER 2010 – REVISED FEBRUARY 2011
4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN DUAL BUCK
SWITCHER WITH INTEGRATED FET AND ONE USB SWITCH AND SVS
Check for Samples: TPS65252
FEATURES
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• Wide Input Supply Voltage Range
(4.5 V - 16 V)
• Output Range 0.8 to ~V_IN - 1 V
• Fully Integrated Dual Buck,
3.5-A/2.5-A Maximum Current,
3-A/2-A Continuous Operation
• High Efficiency
• Switching Frequency:
300 kHz - 2.2 MHz Set By External Resistor
• External Enable/Sequencing Pins
• Adjustable Cycle-By-Cycle Current Limit Set
By External Resistor
• Soft Start Pins
• Current Mode Control With Simple
Compensation Circuit
• Power Good and Reset Generator
• Low Power Mode Set By External Signal
• One Current Adjustable USB Switch With Over
Current Protection
• Supervisory Circuit
• QFN Package, 28-Pin 5 mm x 5 mm RHD
APPLICATIONS
• DTV
• DSL Modems
• Cable Modems
• Set Top Boxes
• Car DVD Players
• Home Gateway and Access Point Networks
• Wireless Routers
V3V
V7V
Vin
VIN1
SS1
EN1
from enable logic
Rlim1
VIN2
SS2
EN2
from enable logic
Rlim2
Low_P
rUSB
INTERNAL
VOLTAGE RAILS
Light Load
Power Saving
OSC
ROSC
PGOOD
PGOOD
BUCK1
BST1
LX1
LX1
FB1
CMP1
BUCK2
BST2
LX2
LX2
FB2
CMP2
VPULL
Vout BUCK1
Vout BUCK2
USB
USB_VIN
USB_EN
USB_nILIM
USB_VO
USB Input
Enable logic
USB Output
VPULL
USB over current
DESCRIPTION/ORDERING INFORMATION
The TPS65252 features two synchronous wide input range high efficiency buck converters. The converters are
designed to simplify its application while giving the designer the option to optimize their usage according to the
target application.
The converters can operate in 5-, 9- or 12-V systems and have integrated power transistors. The output voltage
can be set externally using a resistor divider to any value between 0.8 V and the input supply minus 1 V. Each
converter features enable pin that allows a delayed start-up for sequencing purposes, soft start pin that allows
adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables
designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The COMP
pin allows optimizing transient versus dc accuracy response with a simple RC compensation.
The switching frequency of the converters can be set with an external resistor connected to ROSC pin. The
switching regulators are designed to operate from 300 kHz to 2.2 MHz. The converters operate with 180° phase
between then to minimize the input filter requirements.
TPS65252 also features a low power mode enabled by an external signal, which allows for a reduction on the
input power supplied to the system when the host processor is in stand-by (low activity) mode.
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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.
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.
© 2010–2011, Texas Instruments Incorporated