3.6-V 95% Efficient Boost Converter with 3.3-V 200-mA LDO for 1-Cell LiIon or Dual-Cell Applications - TPS61122

TPS61122 (ACTIVE)

3.6-V 95% Efficient Boost Converter with 3.3-V 200-mA LDO for 1-Cell LiIon or Dual-Cell Applications

Description

The TPS6112x devices provide a complete power supply solution for products powered by either a one-cell Li-Ion or Li-Polymer or a two up to 4 cells Alkaline, NiCd or NiMH batteries. The devices can generate two stable output voltages that are either adjusted by an external resistor divider or fixed internally on the chip. It also provides a simple solution for generating 3.3 V out of a one-cell Li-Ion or Li-Polymer battery at a maximum output current of at least 200 mA with supply voltages down to 1.8 V. The implemented boost converter is based on a fixed frequency, pulse-width-modulation (PWM) controller using a synchronous rectifier to obtain maximum efficiency. The maximum peak current in the boost switch is limited to a value of 1600 mA.

The converter can be disabled to minimize battery drain. During shutdown, the load is completely disconnected from the battery. A low-EMI mode is implemented to reduce ringing and in effect lower radiated electromagnetic energy when the converter enters the discontinuous conduction mode. A power good output at the boost stage simplifies control of any connected circuits like cascaded power supply stages or microprocessors.

The built-in LDO can be used for a second output voltage derived either from the boost output or directly from the battery. The LDO can be enabled separately i.e., using the power good of the boost stage. The device is packaged in a 16-pin QFN package measuring 4 mm x 4 mm (RSA) or in a 16-pin TSSOP (PW) package.

Features

  • Synchronous, 95% Efficient, Boost Converter With 500-mA Output Current From 1.8-V Input
  • Integrated 200-mA Reverse Voltage Protected LDO for DC/DC Output Voltage Post Regulation or Second Output Voltage
  • 40-µA (Typical) Total Device Quiescent Current
  • Input Voltage Range: 1.8-V to 5.5-V
  • Fixed and Adjustable Output Voltage Options up to 5.5-V
  • Power Save Mode for Improved Efficiency at Low Output Power
  • Low Battery Comparator
  • Power Good Output
  • Low EMI-Converter (Integrated Antiringing Switch)
  • Load Disconnect During Shutdown
  • Overtemperature Protection
  • Available in a Small 4mm x 4mm QFN-16 or in a TSSOP-16 Package

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Parametrics Compare all products in Step-Up (Boost) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Topology
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Switch Current Limit (Typ) (A)
Special Features
Rating
Operating Temperature Range (C)
Preset Vout (V)
Pin/Package
Approx. Price (US$)
TPS61122 TPS61120 TPS61121
2     2     2    
1.8     1.8     1.8    
5.5     5.5     5.5    
3.6     2.5     3.3    
3.6     5.5     3.3    
Boost     Boost     Boost    
600     600     600    
0.04     0.04     0.04    
100     100     100    
1.6     1.6     1.6    
Enable
Light Load Efficiency
Load Disconnect
Power Good    
Enable
Light Load Efficiency
Load Disconnect
Power Good    
Enable
Light Load Efficiency
Load Disconnect
Power Good    
Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85    
3.6       3.3    
16TSSOP     16QFN
16TSSOP    
16TSSOP    
1.65 | 1ku     1.65 | 1ku     2.00 | 1ku    

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