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TPS65258RHAR
Three DC-DC converters with Integrated FET and 2 USB Switches
TPS65258
www.ti.com SLVSAB31 –SEPTEMBER 2011
4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE DC-DC
CONVERTERS WITH INTEGRATED FET AND2 USB SWITCHES
Checkfor Samples: TPS65258
1FEATURES by External Resistor Current-Mode Control With Simple•
Wide Input Supply Voltage Range:
Compensation Circuit4.5V- 16V Automatic Low Pulse Skipping (PSM) Power•
0.8-V, 1% Accuracy Reference
Mode, Allowing for an Output Ripple Better•
Continuous Loading: than 2%3A (Buck1),2A (Buck2 and3) Forced PWM Mode•
Maximum Current: Support Pre-Biased Outputs3.5A (Buck 1), 2.5A (Buck2 and3) Power Good Supervisor and Reset Generator•
Synchronous Operation, 300-kHz–
2.2-MHz
Switching Frequency Set By External Resistor •
1-A,2 USB Power Switches With Overcurrent
and Thermal Protection•
External Enable Pins With Built-In Current
Source for Easy Sequencing •
Small, Thermally Efficient 40-Pin 6-mmx 6-mm
RHA (QFN) package•
External Soft Start Pins -40°Cto 125°C Junction Temperature Range•
Adjustable Cycle-by-Cycle Current Limit Set
DESCRIPTION/ORDERING INFORMATIONTPS65258isa power management IC with three step-down buck converters. Both high-side and low-side
MOSFETs are integratedto provide fully synchronous conversion with higher efficiency. The converters are
designedto simplifyits application while giving the designer the optionto optimize their usage accordingto the
target application.
The converters can operatein 5-, 9-, 12-or 15-V systems. The output voltage can be set externally usinga
resistor dividerto any value between 0.8V and the input supply minus the resistive drops on the converter path.
Each converter features enable pin that allowsa delayed start-up for sequencing purposes, soft start pin that
allows adjustable soft-start timeby choosing the soft-start capacitor, anda current limit (RLIM) pin that enables
designerto adjust current limitby selectingan external resistor and optimize the choiceof inductor.All converters
operatein ‘hiccup mode’: Once an over-current lasting more than10 msis sensedin anyof the converters, they
will shut down for10 ms and then the start-up sequencing willbe tried again.If the overload has been removed, and operate normally.If thisis not the case the converter will see another over-current repeating the cycle (hiccup) until the failureis cleared.If an overload condition lasts the converter affected will shut-down and re-start and no global hiccup mode convertersby an externalto ROSC pin. The switchingto 2.2 MHz. with 180° phase between All converters have peak current mode control which simplifies
The device has rampto prevent sub harmonic oscillationsin peak network can stabilize the system and achieve transient response. with the upper resistorof the feedback more over 100 kHz. low power pulse PFM skipping mode which during light guaranteeinga very low output ripple, allowingfora valueof less than 2%at
