LTC3252 - Dual, Low Noise, Inductorless Step-Down DC/DC Converter

The LTC3252 is a switched capacitor step-down DC/DC converter that produces two adjustable regulated outputs from a single 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve a typical efficiency increase of 50% over that of a linear regulator. No inductors are required.

A unique constant frequency, spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The part also has Burst Mode® operation to provide high efficiency at low output currents, as well as ultralow current shutdown.

Low operating currents (60µA with both outputs enabled, 35µA with one output enabled) and low external parts count make the LTC3252 ideally suited for space-constrained battery-powered applications. The part is shortcircuit and overtemperature protected and is available in a tiny 4mm x 3mm 12-pin DFN package.

Features

2.7V to 5.5V Input Voltage Range
No Inductors
Typical Efficiency 50% Higher than LDOs
Spread Spectrum Operation
Low Input and Output Noise
Shutdown Disconnects Load from VIN
Dual Adjustable Independent Outputs (Range: 0.9V to 1.6V)
Output Current: 250mA Each Output
Low Operating Current: IIN = 60µA Typ (35µA with One Output Enabled)
Low Shutdown Current: IIN = 0.01µA Typ
Soft-Start Limits Inrush Current at Turn On
Short Circuit and Over Temperature Protected
Available in 4mm x 3mm 12-Pin DFN Package

Typical Application

Applications

Handheld Electronic Devices
Cellular Phones
Low Voltage Logic Supplies
DSP Power Supplies
3.3V to 1.5V Conversion

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3252EDE#PBF	4x3 DFN-12	E	$3.71	$2.60
LTC3252EDE#TRPBF	4x3 DFN-12	E		$2.70

Demo Boards

Part Number	Description	Price
DC611A	LTC3252EDE Demo Board \| Dual, Spread-Spectrum, Low Noise Inductorless, Step Down Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout1 = 1.5V @ 250mA, Vout2 = 1.2V@250mA	Contact Factory