TPS652510 4.5-V to 16-V input, 3A/2A/2A output, Synchronous triple buck converter | TI.com

TPS652510
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4.5-V to 16-V input, 3A/2A/2A output, Synchronous triple buck converter

4.5-V to 16-V input, 3A/2A/2A output, Synchronous triple buck converter - TPS652510
Datasheet
 

Description

TPS652510 is a power management IC with three step-down buck converters. Both high-side and low-side MOSFETs are integrated to provide fully synchronous conversion with higher efficiency. 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-, 12- or 15-V systems. The output voltage can be set externally using a resistor divider to any value between 0.8 V and the input supply minus the resistive drops on the converter path. 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 (RLIM) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. All converters operate in ‘hiccup mode’: Once an over-current lasting more than 10 ms is sensed in any of the converters, they will shut down for 10 ms and then the start-up sequencing will be tried again. If the overload has been removed, the converter will ramp up and operate normally. If this is not the case the converter will see another over-current event and shuts down again repeating the cycle (hiccup) until the failure is cleared. If an overload condition lasts for less than 10 ms, only the relevant converter affected will shut-down and re-start and no global hiccup mode will occur.

The switching frequency of the converters is set by 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. All converters have peak current mode control which simplifies external frequency compensation.

The device has a built-in slope compensation ramp to prevent sub harmonic oscillations in peak current mode control. A traditional type II compensation network can stabilize the system and achieve fast transient response. Moreover, an optional capacitor in parallel with the upper resistor of the feedback divider provides one more zero and makes the crossover frequency over 100 kHz.

All converters feature an automatic low power pulse PFM skipping mode which improves efficiency during light loads and standby operation, while guaranteeing a very low output ripple, allowing for a value of less than 2% at low output voltages.

The device incorporates an overvoltage transient protection circuit to minimize voltage overshoot. The OVP feature minimizes the output overshoot by implementing a circuit to compare the FB pin voltage to OVP threshold which is 109% of the internal voltage reference. If the FB pin voltage is greater than the OVTP threshold, the high side MOSFET is disabled preventing current from flowing to the output and minimizing output overshoot. When the FB voltage drops lower than the OVP lower threshold which is 107%, the high side MOSFET is allowed to turn on the next clock cycle.

TPS652510 features a supervisor circuit which monitors each buck’s output and the PGOOD pin is asserted once sequencing is done. The PGOOD pin is an open drain output. The PGOOD pin is pulled low when any buck converter is pulled below 85% of the nominal output voltage. The PGOOD is pulled up when all converter outputs are more than 90% of its nominal output voltage. The default reset time is 100 ms. The polarity of the PGOOD is active high.

The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 160°C. The thermal shutdown forces the device to stop operating when the junction temperature exceeds thermal trip threshold. Once the die temperature decreases below 140°C, the device reinitiates the power up sequence. The thermal shutdown hysteresis is 20°C.

Features

  • Wide Input Supply Voltage Range:
    4.5 V – 16 V
  • 0.8-V, 1% Accuracy Reference
  • Continuous Loading:
    3 A (Buck1), 2 A (Buck2 and 3)
  • Maximum Current:
    3.5 A (Buck 1), 2.5 A (Buck2 and 3)
  • Synchronous Operation, 300-kHz –
    2.2-MHz Switching Frequency Set By External Resistor
  • External Enable Pins With
    Built-In Current Source for Easy Sequencing
  • External Soft Start Pins
  • Adjustable Cycle-by-Cycle Current Limit Set
    by External Resistor
  • Current-Mode Control With Simple Compensation
    Circuit
  • Automatic Low Pulse Skipping (PSM) Power Mode,
    Allowing for an Output Ripple Better than 2%
  • Support Pre-Biased Outputs
  • Power Good Supervisor and Reset Generator
  • Small, Thermally Efficient 40-Pin 6-mm ×
    6-mm RHA (QFN) package
  • –40°C to 125°C Junction Temperature Range

Parametrics

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Part number Order Regulated outputs (#) Processor supplier Processor name Vin (Min) (V) Vin (Max) (V) Step-up DC/DC controller Step-down DC/DC controller LDO Step-up DC/DC converter Step-down DC/DC converter Iout (Max) (A) Iq (Typ) (mA) Features Shutdown current (Typ) (uA) Rating Operating temperature range (C) Package size: mm2:W x L (PKG) Package Group
TPS652510 Order now 3         4.5     16               3     0.6     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable
Soft Start Adjustable    
  Catalog     -40 to 85     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)     VQFN | 40    
TPS65250 Order now 3         4.5     18               3     20     Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Synchronous Rectification
UVLO Adjustable
Soft Start Adjustable    
  Catalog     -40 to 125     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)     VQFN | 40    
TPS65251 Order now 3         4.5     18               3     20     Adjustable Current Limit
Enable
Frequency Synchronization
Phase Interleaving
Power Good
Synchronous Rectification
UVLO Adjustable
Soft Start Adjustable    
  Catalog     -40 to 125     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)     VQFN | 40    
TPS65252 Order now 2         4.5     16               3     0.5     Adjustable Current Limit
Enable
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification
UVLO Adjustable
Soft Start Adjustable    
  Catalog     -40 to 85     28VQFN: 25 mm2: 5 x 5 (VQFN | 28)     VQFN | 28    
TPS65257 Order now 3         4.5     16               3     0.6     Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable
Soft Start Adjustable    
  Catalog     -40 to 85     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)     VQFN | 40    
TPS65258 Order now 3     LBC7     LBC7