LM27761 Low-Noise Regulated Inverter with Integrated LDO | TI.com

LM27761 (ACTIVE) Low-Noise Regulated Inverter with Integrated LDO

 

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Description

The LM27761 low-noise regulated switched-capacitor voltage inverter delivers a very low-noise adjustable output for an input voltage in the range of 2.7 V to 5.5 V. Four low-cost capacitors are used in the application solution to provide up to 250 mA of output current. The regulated output for the device is adjustable between −1.5 V and −5 V. The LM27761 operates at 2-MHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 370 µA (charge-pump power efficiency greater than 80% with most loads) and 7-µA typical shutdown current, the LM27761 provides ideal performance when driving power amplifiers, DAC bias rails, and other high-current, low-noise voltage applications.

Features

  • Inverts and Regulates the Input Supply Voltage
  • Low Output Ripple
  • Shutdown Lowers Quiescent Current to 7 µA (Typical)
  • Up to 250-mA Output Current
  • 2.5-Ω Inverter Output Impedance, VIN = 5 V
  • ±4% Regulation at Peak Load
  • 370-µA Quiescent Current
  • 2-MHz (Typical) Low-Noise Fixed-Frequency Operation
  • 35-dB (Typical) LDO PSRR at 2 MHz
    With 80-mA Load Current
  • 30-mV LDO Dropout Voltage at 100 mA,
    VOUT = –5 V
  • Current Limit and Thermal Protection
  • Create a Custom Design Using the LM27761 With the WEBENCH® Power Designer

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WEBENCH® Designer LM27761

  Min   Max Range
Vin  V 2.7 to 5.5V
Vout  V -5 to -1.5V
Iout  A ≤ 0.25A
Ambient Temp  °C -40 to 85°C


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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
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    
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    
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