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LTC1928-5 - Doubler Charge Pump with Low Noise Linear Regulator in SOT-23

Datasheet

Documentation

Features

Low Output Noise: 90µV_RMS (100kHz BW)
Low Profile (1mm) ThinSOT™ Package
Fixed Output Voltage: 5V
Input Voltage Range: 2.7V to 4.4V
Uses Small Ceramic Capacitors
No Inductors Required
Output Current Up to 30mA
550kHz Switching Frequency
Low Operating Current: 190µA
Low Shutdown Current: 4µA
Internal Thermal Shutdown and Current Limiting

Typical Application

Description

The LTC1928-5 is a doubler charge pump with an internal low noise, low dropout (LDO) linear regulator. The part is designed to provide a low noise boosted supply voltage for powering noise sensitive devices such as high frequency VCOs in wireless applications.

An internal charge pump converts a 2.7V to 4.4V input to a boosted output, while the internal LDO regulator converts the boosted voltage to a low noise regulated output. The regulator is capable of supplying up to 30mA of output current. Shutdown reduces the supply current to <8µA, removes the load from V_IN by disabling the regulator and discharges V_OUT to ground through a 200 Ohms switch.

The LTC1928-5 LDO regulator is stable with only 2µF on the output. Small ceramic capacitors can be used, reducing PC board area.

The LTC1928-5 is short-circuit and overtemperature protected. The part is available in a 6-pin low profile (1mm) ThinSOT package.

Packaging

SOT-23

Order Info

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*
LTC1928ES6-5#PBF	SOT	6	E	$2.06
LTC1928ES6-5#TRMPBF	SOT	6	E	$2.06	$1.78
LTC1928ES6-5#TRPBF	SOT	6	E	$2.06	$1.76
LTC1928ES6-5	SOT	6	E	$4.12
LTC1928ES6-5#TR	SOT	6	E	$4.12	$3.52
LTC1928ES6-5#TRM	SOT	6	E	$4.12	$3.56

^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number	Description	Price	Documentation
DC353A	LTC1928ES6-5 \| Low Noise Boost DC/DC Converter, 2.7V to 4.4V Input, 5Vout @ 30mA	$75.00	Design File Manual