Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications - TPS62730

TPS62730 (ACTIVE)

Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications


Special note

See how the TPS62730 and other TI products combine to create a unique Wireless Body Sensor SOLUTION

TPS62730 with CC430

TPS62730 with CC430

Step-down Converter Plus Integrated Bypass Mode for Ultra-Low-Power Wireless Applications

Description

The TPS62730 is a high frequency synchronous step-down DC-DC converter optimized for ultra low-power wireless applications. The device is optimized to supply TI’s Low-Power Wireless sub 1-GHz and 2.4-GHz RF transceivers and System-On-Chip (SoC) solutions. The TPS62730 reduces the current consumption drawn from the battery during TX and RX mode by a high efficient step-down voltage conversion. The device provides an output current of up to 100 mA and allows the use of tiny and low-cost chip inductors and capacitors. With an input voltage range of 1.9 V to 3.9 V, the device supports Li-primary battery chemistries such as Li-SOCl2, Li-SO2, Li-MnO2, and also two cell alkaline batteries.

The TPS62730 features an Ultra Low-Power bypass mode with typical 30-nA current consumption to support sleep and low power modes of TI’s CC2540 Bluetooth Low Energy and CC430 SoC solutions. In this bypass mode, the output capacitor of the DC-DC converter is connected through an integrated typical 2.1-Ω bypass switch to the battery.

In DC-DC operation mode the device provides a fixed output voltage to the system. With a switch frequency up to 3 MHz, the TPS62730 features low output ripple voltage and low noise even with a small 2.2-µF output capacitor. The automatic transition into bypass mode during DC-DC operation prevents an increase of output ripple voltage and noise once the DC-DC converter operates close to 100% duty cycle. The device automatically enters bypass mode once the battery voltage falls below the transition threshold VIT BYP . The TPS62730 is available in a 1 × 1.5-mm2 6-pin USON package.

Features

  • Input Voltage Range VIN From 1.9 V to 3.9 V
  • Typ. 30-nA Ultra Low-Power Bypass Mode
  • Typ. 25-µA DC-DC Quiescent Current
  • Internal Feedback Divider Disconnect
  • Typical 2.1-Ω: Bypass Switch Between VIN and VOUT
  • Automatic Transition from DC-DC to Bypass Mode
  • Up to 3-MHz Switch Frequency
  • Up to 95% DC-DC Efficiency
  • Open-Drain Status Output STAT
  • Output Peak Current up to 100 mA
  • Fixed Output Voltages 1.9 V, 2.05 V, 2.1 V, 2.3 V
  • Small External Output Filter Components 2.2 µH and 2.2 µF
  • Optimized For Low Output Ripple Voltage
  • Small 1 × 1.5 × 0.6-mm3 USON Package
  • 12-mm2 Minimum Solution Size

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Parametrics Compare all products in Step-Down (Buck) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Preset Vout (V)
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
TPS62730 TPS62732 TPS62733 TPS62740 TPS62742 TPS62743 TPS62745 TPS62746
1     1     1     1     1     1     1     1    
1.9     1.9     1.9     2.2     3     2     3.3     2    
3.9     3.9     3.9     5.5     5.5     5.5     10     5.5    
2.1     1.9     2.3     1.8     1.8     1.2     1.8     1.2    
2.1     1.9     2.3     3.3     3.3     3.3     3.3     3.3    
0.1     0.1     0.1     0.3     0.4     0.3     0.3     0.3    
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck    
            2500      
0.41     0.41     0.41     0.6     0.6     0.6     0.6     0.6    
0.025     0.025     0.025     0.0003     0.0003     0.0003     0.0004     0.0003    
100     100     100     100     100     100     100     100    
Fixed     Fixed     Fixed     Fixed     Fixed     Fixed     Fixed     Fixed    
Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Dynamic Voltage Scaling
Enable
Light Load Efficiency
Output Discharge
Synchronous Rectification    
Dynamic Voltage Scaling
Light Load Efficiency
Output Discharge
Power Good
Synchronous Rectification    
Dynamic Voltage Scaling
Enable
Light Load Efficiency
Output Discharge
Synchronous Rectification    
Dynamic Voltage Scaling
Enable
Light Load Efficiency
Output Discharge
Synchronous Rectification    
Dynamic Voltage Scaling
Enable
Light Load Efficiency
Output Discharge
Synchronous Rectification    
DCS-Control     DCS-Control     DCS-Control     DCS-Control     DCS-Control     DCS-Control     DCS-Control     DCS-Control    
2.1       2.3              
1.5     1.5     1.5     2.5     2.5     2.5     2     2.5    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 125     -40 to 85    
6SON     6SON     6SON     12WSON     12WSON     8DSBGA     12WSON     8DSBGA    
0.55 | 1ku     0.55 | 1ku     0.55 | 1ku     1.12 | 1ku     1.12 | 1ku     0.95 | 1ku     1.29 | 1ku     0.98 | 1ku    
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