2 Buck Converter with 4.5V to 16V Input Voltage, 2A/3A Output Current - TPS65270

TPS65270 (ACTIVE)

2 Buck Converter with 4.5V to 16V Input Voltage, 2A/3A Output Current

 

Description

The TPS65270 is a monolithic, dual synchronous buck regulator with a wide operating input voltage that can operate in 5-V, 9-V, 12-V, or 15-V bus voltages and battery chemistries. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.

The TPS65270 features a precision 0.8-V reference and can produce output voltages up to 15 V. Each converter features an enable pin that allows dedicated control of each channel that provides flexibility for power sequencing. Soft-start time in each channel can be adjusted by choosing different external capacitors. TPS65270 is also able to start up with a prebiased output. The converter begins switching when output voltage reaches the prebiased voltage.

Constant frequency peak current-mode control simplifies the compensation and provides fast transient response. Cycle-by-cycle overcurrent protection and hiccup mode operation limits MOSFET power dissipation in short-circuit or overloading fault conditions. Low-side reverse current protection also prevents excessive sinking current from damaging the converter.

The switching frequency of the converters can be set from 300 KHz to 1.4 MHz with an external resistor. Two converters have 180° out-of-phase clock signals to minimize the input filter requirements and alleviate EMI and input capacitor requirements.

TPS65270 also features a light-load pulse skipping mode (PSM). The PSM mode allows a power loss reduction on the input power supplied to the system at light loading in order to achieve light-load high efficiency.

The TPS65270 is available in a 24-pin, thermally enhanced HTSSOP (PWP) package and 24-pin VQFN (RGE) package.

Features

  • Wide Input Supply Voltage Range: 4.5 V to 18 V
  • 0.8 V, ±1% Accuracy Reference
  • Up to 2-A (Buck 1) and 3-A (Buck 2) Maximum Continuous Output Loading Current
  • Low-Power Pulse Skipping Mode to Achieve High Light Load Efficiency
  • Adjustable Switching Frequency 300 kHz to 1.4 MHz Set by External Resistor
  • Startup With a Prebiased Output Voltage
  • Dedicated Enable and Soft Start for Each Buck
  • Peak Current-Mode Control With Simple Compensation Circuit
  • Cycle-by-Cycle Overcurrent Protection
  • 180° Out-of-Phase Operation to Reduce Input Capacitance and Power Supply Induced Noise
  • Available in 24-Lead Thermally Enhanced HTSSOP (PWP) and VQFN 4-mm × 4-mm (RGE) Packages

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Parametrics Compare all products in Buck Converter (Integrated Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Special Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
TPS65270 TPS54290 TPS54291 TPS54292 TPS65253
4.5    4.5    4.5    4.5    4.5   
16    18    18    18    16   
0.8    0.8    0.8    0.8    0.8   
15    16.2    15.3    14    15   
3    2.5    2.5    2.5    3.5   
2    2    2    2    2   
300    300    600    1200    300   
1.4    300    600    1200    1500   
0.01    1.8    1.8    1.8    0.6   
Light Load Efficiency
Phase Interleaving
Pre-Bias Start-Up   
Enable
Phase Interleaving
Synchronous Rectification   
Enable
Phase Interleaving
Synchronous Rectification   
Enable
Phase Interleaving
Synchronous Rectification   
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification
UVLO Adjustable   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
100    90    85    78    100   
-40 to 85    -40 to 145    -40 to 145    -40 to 145    -40 to 85   
Catalog    Catalog    Catalog    Catalog    Catalog   
HTSSOP
VQFN   
HTSSOP    HTSSOP    HTSSOP    VQFN