LT3028 Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs

The LT®3028 is a dual, micropower, low noise, low dropout regulator with independent inputs. With an external 0.01µF bypass capacitor, output noise is a low 20µVRMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 30µA quiescent current per output makes it an ideal choice. In shutdown, quiescent current drops to less than 0.1µA. Shutdown control is independent for each output, allowing for flexibility in power management. The device is capable of operating over an input voltage range of 1.8V to 20V. Output 1 can supply 500mA of output current with a dropout voltage of 320mV. The device can supply 100mA of output current from Output 2 with a dropout voltage of 300mV. Quiescent current is well controlled in dropout.

The LT3028 regulator is stable with output capacitors as low as 1µF for the 100mA output and 3.3µF for the 500mA output. Small ceramic capacitors can be used without the series resistance required by other regulators.

Internal protection circuitry includes reverse-battery protection, current limiting and thermal limiting protection. The device is available as an adjustable device with a 1.22V reference voltage. The LT3028 regulator is available in the thermally enhanced 16-lead TSSOP and 16-lead, low profile (5mm × 3mm × 0.75mm) DFN packages.

Protected by U.S. Patents including 6118263, 6144250

产品特点 Features

Low Noise: 20µVRMS (10Hz to 100kHz)
Low Quiescent Current: 30µA/Output
Independent Inputs
Wide Input Voltage Range: 1.8V to 20V
Output Current: 100mA/500mA
Very Low Shutdown Current: <0.1µA
Low Dropout Voltage: 300mV/320mV at 100mA/500mA
Adjustable Outputs from 1.22V to 20V
Stable with as Low as 1µF/3.3µF Output Capacitor
Stable with Aluminum, Tantalum or Ceramic Capacitors
Reverse-Battery Protected
No Protection Diodes Needed
Overcurrent and Overtemperature Protected
Tracking/Sequencing Capability
Thermally Enhanced 16-Lead TSSOP and 16-Lead (5mm × 3mm) DFN Packages

应用

Cellular Phones
Pagers
Battery-Powered Systems
Frequency Synthesizers
Wireless Modems
Tracking/Sequencing Power Supplies

典型应用图

参数

LT3028 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT3028EDHC	DFN	16	E	$3.15	$2.65
LT3028EDHC#PBF	DFN	16	E	$3.15	$2.65
LT3028EDHC#TR	DFN	16	E		$2.75
LT3028EDHC#TRPBF	DFN	16	E		$2.75
LT3028EFE	TSSOP	16	E	$3.04	$2.55
LT3028EFE#PBF	TSSOP	16	E	$3.04	$2.55
LT3028EFE#TR	TSSOP	16	E		$2.67
LT3028EFE#TRPBF	TSSOP	16	E		$2.67
LT3028IDHC	DFN	16	I	$3.78	$3.18
LT3028IDHC#PBF	DFN	16	I	$3.78	$3.18
LT3028IDHC#TR	DFN	16	I		$3.28
LT3028IDHC#TRPBF	DFN	16	I		$3.28
LT3028IFE	TSSOP	16	I	$3.64	$3.06
LT3028IFE#PBF	TSSOP	16	I	$3.64	$3.06
LT3028IFE#TR	TSSOP	16	I		$3.18
LT3028IFE#TRPBF	TSSOP	16	I		$3.18

演示电路板

器件型号	描述
DC832A	LT3028DHC \| Dual Input, Dual Output Regulator, Vin1 & Vin2 = 2.3V-20V, Vout1 & Vout2 = 2.5V or 3.3V or 5V @ 100mA

LT3028 数据手册及相关资料下载

数据手册(英文) : LT3028 - Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs.PDF
可靠性数据 : R386 Reliability Data .PDF