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TPS652510RHAR
Three DC-DC Converters with Integrated FET with 4.5V to 16V Input
TPS652510
www.ti.com SLVSB30B –SEPTEMBER 2011–REVISED AUGUST 2013
4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE DC-DC
CONVERTERS WITH INTEGRATED FET
Checkfor Samples: TPS652510
1FEATURES • Adjustable Cycle-by-Cycle Current Limit Set External Resistor• Wide Input Supply Voltage Range: Current-Mode Control With Simple4.5V- 16V
Compensation Circuit• 0.8-V, 1% Accuracy Reference Automatic Low Pulse Skipping (PSM) Power• Continuous Loading: Mode, Allowing for an Output Ripple Better3A (Buck1),2A (Buck2 and3) than 2%• 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 Small, Thermally Efficient 40-Pin 6-mmx 6-mmSwitching Frequency Set By External Resistor
RHA (QFN) package• External Enable Pins With Built-In Current -40°Cto 125°C Junction Temperature RangeSource for Easy Sequencing External Soft Start Pins
DESCRIPTION/ORDERING INFORMATIONTPS652510isa 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,
the converter will rampup 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 relevant converter affected will shut-down and re-start and no global hiccup modeof the convertersis setby an external resistor connectedto ROSC pin. The switchingto 2.2 MHz. with 180° phase between All converters mode control which simplifies rampto prevent sub harmonic peak
control.A traditional network can stabilize the system and achieve fast transient with the upper resistorof the feedback divider more over 100 kHz. low power pulse PFM skipping mode which guaranteeinga very low output ripple, allowingof less than 2%at
