TPS65262-1 4.5V to 18V Input, 3A/1A/1A Triple Synchronous Step-Down Converter with 350mA/150mA Dual LDOs | TI.com

TPS65262-1 (ACTIVE)

4.5V to 18V Input, 3A/1A/1A Triple Synchronous Step-Down Converter with 350mA/150mA Dual LDOs

 

Description

The TPS65262-1 is a monolithic, triple-synchronous step-down (buck) converter with 3-A/1-A/1-A output current. A wide 4.5- to 18-V input supply voltage range encompasses the most intermediate bus voltage operating off 5-V, 9-V, 12-V, or 15-V power bus. The converter, with constant frequency peak current mode, is designed to simplify its application while giving designers options to optimize the system according to targeted applications. The device operates at 600-kHz fixed switching frequency. The loop compensations for buck 2 and buck3 have been integrated for less external components. The 180° out-of-phase operation between buck1 and buck2, buck3 (buck2 and buck3 run in phase) minimizes the input filter requirements. At light load, the device automatically operates in pulse skipping mode (PSM) which provides high efficiency by reducing switching losses.

Two low dropout voltage linear regulators (LDOs) are built in TPS65262-1 with input voltage range of 1.3 to 5.5 V, continuous output current 350/150 mA, independent enable, and adjustable output voltage.

The TPS65262-1 features an automatic power sequence with driving MODE pin to high and configuring EN1, EN2, and EN3 pins.

The device features protection for overvoltage, overcurrent, short-circuit, and overtemperature. A power good pin asserts when any buck output voltages are out of regulation.

Features

  • Operating Input Voltage Range: 4.5 to 18 V
  • Feedback Reference Voltage: 0.6 V ±1%
  • Maximum Continuous Output Current: 3 A/1 A/1 A
  • Fixed 600-kHz Switching Frequency
  • Integrated Dual LDOs With:
    • Input Voltage Range: 1.3 to 5.5 V
    • Continuous Output Current: 350 mA/150 mA
  • Programmable Soft-Start Time for Buck1
  • Fixed 1-ms Soft-Start Time for Buck2 and Buck3
  • Internal Loop Compensation for Buck2 and Buck3
  • Dedicated Enable Pins for Each Buck
  • Automatic Power-Up and Power-Down Sequence
  • Pulse Skipping Mode (PSM) at Light Load
  • Output Voltage Power-Good Indicator
  • Thermal Overloading Protection

WEBENCH® Designer TPS65262-1

  Min   Max Range
Vin1  V 4.50 to 18.00V
Vout1  V 0.6 to 5.5V
Iout1  A ≤ 3.00A
 
Vin2  V 4.50 to 18.00V
Vout2  V 0.6 to 5.5V
Iout2  A ≤ 1.00A
 
Vin3  V 4.50 to 18.00V
Vout3  V 0.6 to 5.5V
Iout3  A ≤ 1.00A
 
Vin4  V 1.30 to 5.50V
Vout4  V 1.00 to 5.50V
Iout4  A ≤ 0.54A

Vin5  V 1.30 to 5.50V
Vout5  V 1.00 to 5.50V
Iout5  A ≤ 0.29A

Ambient Temp  °C -40.00 to 125.00°C

Parametrics

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Part number Order 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) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
TPS65262-1 Order now 1.3     18     0.6     17     3     5     540     670     0.79     Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification
UVLO Adjustable    
Current Mode     100     -40 to 85     Catalog     VQFN | 32     Converter     32VQFN: 25 mm2: 5 x 5 (VQFN | 32)    
TPS65251 Order now 4.5     18     0.8     17     3     3     300     2200     20     Adjustable Current Limit
Enable
Frequency Synchronization
Phase Interleaving
Power Good
Synchronous Rectification
UVLO Adjustable    
Current Mode     100     -40 to 125     Catalog     VQFN | 40     Converter     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)    
TPS65251-1 Order now 4.5     17     0.8     17     3     3     300     2200     1     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification
UVLO Adjustable    
Current Mode     90     -40 to 125     Catalog     VQFN | 40     Converter     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)    
TPS65251-2 Order now 4.5     17     0.8     17     3     3     300     2200     1     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification
UVLO Adjustable    
Current Mode     90     -40 to 125     Catalog     VQFN | 40     Converter     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)    
TPS65251-3 Order now 4.5     17     0.8     17     3     3     300     2200     1