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LM27762, Low-Noise Inverting Charge Pump

Texas Instruments offers its LM27762, low-noise, positive and negative output charge pump with integrated LDO

Image of Texas Instruments' LM27762 Low-Noise Inverting Charge PumpTexas Instruments' LM27762 delivers very-low-noise positive and negative outputs that are adjustable between ±1.5 V and ±5 V. The input-voltage range is from 2.7 V to 5.5 V and the output current goes up to ±250 mA. With an operating current of only 390 µA and a 0.5 µA typical shutdown current, the LM27762 provides ideal performance for power amplifier and DAC bias along with other high-current, low-noise, negative-voltage needs. The device provides a small solution size with few external components.

Negative voltage is generated by a regulated inverting charge pump followed by a low-noise negative LDO. The inverting charge pump of the LM27762 device operates at 2 MHz (typical) switching frequency to reduce output resistance and voltage ripple. Positive voltage is generated from the input by a low-noise positive LDO. 

Positive and negative outputs of the LM27762 have dedicated enable inputs. These outputs support independent timing for the positive and negative rails for specific system power-sequence needs. Enable inputs can also be shorted together and connected to the input voltage. The LM27762 has an optional power good feature.

Features
  • Generates low-noise, adjustable, positive supply voltage between 1.5 V and 5 V and negative supply voltage between -1.5 V and -5 V
  • Input-voltage range of 2.7 V to 5.5 V
  • ±250 mA output current
  • Inverting charge pump followed by negative LDO
  • 2 MHz, low-noise, fixed-frequency operation
  • 2.5 Ω inverter output impedance, VIN = 5 V
  • Negative LDO dropout voltage 30 mV at 100 mA, VOUT = -5 V
  • Positive LDO with 45 mV dropout voltage at 100 mA, VOUT = 5 V
  • 390 µA quiescent current (typical)
  • Shutdown quiescent current to 0.5 µA (typical)
  • Current-limit and thermal protection
  • Power-good pin (active low)

LM27762, Low-Noise Inverting Charge Pump

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC REG CHARGE PUMP ADJ DL 12WSONLM27762DSSTIC REG CHARGE PUMP ADJ DL 12WSON2358 - ImmediateView Details
Published: 2016-12-12