LM2776 Switched Capacitor Inverter | TI.com

LM2776
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Switched Capacitor Inverter

Switched Capacitor Inverter - LM2776
Datasheet
 

Description

The LM2776 CMOS charge-pump voltage converter inverts a positive voltage in the range from 2.7 V to 5.5 V to the corresponding negative voltage. The LM2776 uses three low-cost capacitors to provide 200 mA of output current without the cost, size, and electromagnetic interference (EMI) related to inductor-based converters.

With an operating current of only 100 µA and operating efficiency greater than 90% at most loads, the LM2776 provides ideal performance for battery-powered systems requiring a high power negative power supply.

The LM2776 has been placed in TI’s 6-pin SOT-23 to maintain a small form factor.

Features

  • Input Voltage: 2.7 V to 5.5 V
  • 200-mA Output Current
  • Inverts Input Supply Voltage
  • Low-Current PFM Mode Operation
  • 2-MHz Switching Frequency
  • Greater than 90% Efficiency
  • Current Limit and Thermal Protection
  • No Inductors

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WEBENCH ® Designer LM2776

    Range
Vin  V 2.7 to 5.5V
Vout  V
Iout  A ≤ 0.2A
Ambient Temp   °C -40 to 85 °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 Operating temperature range (C) Type Rating Package Group
LM2776 Order now 2.7     5.5     -5.5     -2.7     0.2     1     1700     2300     0.1     Enable
Light Load Efficiency Mode
Output Discharge
Synchronous Rectification
UVLO Fixed    
-40 to 85     Charge Pump     Catalog     SOT-23 | 6    
LM27761 Order now 2.7     5.5     -5.2     -1.5     0.25     1     1700     2300     0.37     Enable
Integrated LDO
Light Load Efficiency Mode
Output Discharge
Synchronous Rectification
UVLO Fixed    
-40 to 85     Charge Pump     Catalog     WSON | 8    
LM27762 Order now 2.7     5.5     -5     5     0.25     2     1800     2200     0.39     Enable
Integrated LDO
Light Load Efficiency Mode
Multiple Outputs
Output Discharge
Power Good
Synchronous Rectification    
-40 to 85     Charge Pump     Catalog     WSON | 12