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AC/DC 和 DC/DC 轉換器 (整合式 FET)

LM27762

現行

具整合式 LDO 的低雜訊正負輸出充電幫浦

立即訂購
產品規格表

LM27762

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Operating temperature range (°C) -40 to 85 Type Charge pump Iout (max) (A) 0.25 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1800 Switching frequency (max) (kHz) 2200 Features Enable, Integrated LDO, Light Load Efficiency Mode, Multiple Outputs, Output discharge, Power good, Regulated, Synchronous Rectification Vout (min) (V) -5 Vout (max) (V) 5 Iq (typ) (µA) 390
Rating Catalog Operating temperature range (°C) -40 to 85 Type Charge pump Iout (max) (A) 0.25 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1800 Switching frequency (max) (kHz) 2200 Features Enable, Integrated LDO, Light Load Efficiency Mode, Multiple Outputs, Output discharge, Power good, Regulated, Synchronous Rectification Vout (min) (V) -5 Vout (max) (V) 5 Iq (typ) (µA) 390
WSON (DSS) 12 6 mm² 3 x 2
  • 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 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)
  • Create a Custom Design Using the LM27762 With the WEBENCH Power Designer
  • 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 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)
  • Create a Custom Design Using the LM27762 With the WEBENCH Power Designer

The LM27762 delivers very low-noise positive and negative outputs that are adjustable between ±1.5 V and ±5 V. Input-voltage range is from 2.7 V to 5.5 V, and output current goes up to ±250 mA. With an operating current of only 390 µA and 0.5-µA typical shutdown current, the LM27762 provides ideal performance for power amplifier and DAC bias and 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 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 be also shorted together and connected to the input voltage. The LM27762 has an optional Power Good feature.

For all available packages, see the orderable addendum at the end of the data sheet.

The LM27762 delivers very low-noise positive and negative outputs that are adjustable between ±1.5 V and ±5 V. Input-voltage range is from 2.7 V to 5.5 V, and output current goes up to ±250 mA. With an operating current of only 390 µA and 0.5-µA typical shutdown current, the LM27762 provides ideal performance for power amplifier and DAC bias and 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 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 be also shorted together and connected to the input voltage. The LM27762 has an optional Power Good feature.

For all available packages, see the orderable addendum at the end of the data sheet.

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類型 標題 日期
* Data sheet LM27762 Low-Noise Positive and Negative Output Integrated Charge Pump Plus LDO datasheet (Rev. B) PDF | HTML 2017年 2月 6日
Application note Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) PDF | HTML 2022年 5月 23日
Technical article Low-noise charge pumps make it easy to create negative voltages PDF | HTML 2017年 8月 30日
Technical article The top three ways to split a voltage rail to a bipolar supply PDF | HTML 2016年 12月 27日
User guide Using the LM27762 Evaluation Module 2016年 8月 26日

設計與開發

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The LM27762 evaluation module (EVM) helps designers evaluate the operation and performance of this device. The   LM27762EVM uses the LM27762 to provide very low-noise adjustable positive and negative outputs for an input voltage range of 2.7 V to 5.5 V. Five low-cost capacitors are (...)
使用指南: PDF
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模擬型號

LM27762 Unencrypted PSpice Transient Model Package (Rev. B)

SNVMAV1B.ZIP (122 KB) - PSpice Model
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