LTC3221

Micropower, Regulated Charge Pump in 2 x 2 DFN

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Overview

Features and Benefits
Product Details

Features and Benefits

Ultralow Power: 8μA Quiescent Current
Regulated Output Voltages: 3.3V ±4%, 5V ±4%, ADJ
V_IN Range:
- 1.8V to 4.4V (LTC3221-3.3)
- 2.7V to 5.5V (LTC3221-5)
Output Current: Up to 60mA
No Inductors Needed
Very Low Shutdown Current: <1μA
Shutdown Disconnects Load from V_IN
Burst Mode Control
Short-Circuit Protected
Solution Profi le < 1mm
Tiny 2mm × 2mm 6-Pin DFN Package

Product Details

The LTC3221 family are micropower charge pump DC/DC converters that produce a regulated output at up to 60mA. The input voltage range is 1.8V to 5.5V. Extremely low operating current (8μA typical at no load) and low external parts count (one flying capacitor and two small bypass capacitors at V_IN and V_OUT) make them ideally suited for small, battery-powered applications.

The LTC3221 family includes fi xed 5V and 3.3V output versions plus an adjustable version. All parts operate as Burst Mode^® switched capacitor voltage doublers to achieve ultralow quiescent current. The chips use a controlled current to supply the output and will survive a continuous short-circuit from V_OUT to GND. The FB pin of the adjustable LTC3221 can be used to program the desired output voltage.

The LTC3221 family is available in a low profile (0.75mm) 2mm × 2mm 6-pin DFN package.

Applications

Low Power 2 AA Cell to 3.3V Supply
Memory Backup Supplies
Tire Pressure Sensors
General Purpose Low Power Li-Ion to 5V Supply
RF Transmitters
Glucose Meters

Product Categories

Power Management
- Regulated Step-Up Charge Pumps
- Regulated Buck-Boost Charge Pumps

Comparable Parts Click to see all in Parametric Search

Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (3)

DC862A-C

LTC3221EDC Demo Board | Micropower Regulated Adjustable Output Charge Pump, 1.8V ≤ V_IN ≤ 3.8V, V_OUT = 3V @ Up to 60mA

DC862A-A

LTC3221EDC-3.3 Demo Board | Micropower Regulated Charge Pump, 1.8V ≤ V_IN ≤ 4.4V, V_OUT = 3.3V @ Up to 60mA

DC862A-B

LTC3221EDC-5 Demo Board | Micropower Regulated Charge Pump, 2.7V ≤ V_IN ≤ 5.5V, V_OUT = 5V @ Up to 60mA

DC862A-C

View Detailed Evaluation Kit Information

Demonstration circuit 862 is a micropower regulated charge pump DC/DC converter featuring the 60mA output LTC3221 in a 2mm × 2mm DFN package. It comes in three assembly versions, DC862A-A, DC862A-B and DC862A-C, featuring the LTC3221EDC-3.3 (fixed 3.3V output), the LTC3221EDC-5 (fixed 5V output) , and LTC3221EDC (adjustable output set to 3V), respectively. The demo board input voltage range depends on the IC used; for the adjustable output DC862A-C, the input voltage range is 1.8V to 3.8V.

The LTC3221's low 8µA no-load quiescent current is even lower than the self-discharging current of many batteries. By employing a constant current to charge the output, the output ripple is low even at high input and light load, and is fairly constant over the full input voltage range.

Resources

DC862A-A

View Detailed Evaluation Kit Information

Demonstration circuit 862 is a micropower regulated charge pump DC/DC converter featuring the 60mA output LTC3221 in a 2mmx2mm DFN package. It comes in three assembly versions, DC862A-A, DC862A-B and DC862A-C, featuring the LTC3221EDC-3.3 (fixed 3.3V output), the LTC3221EDC-5 (fixed 5V output) , and LTC3221EDC (adjustable output set to 3V), respectively. The demo board input voltage range depends on the IC used; for the 3.3V output DC862A-A, the input voltage range is 1.8V to 4.4V.

Resources

DC862A-B

View Detailed Evaluation Kit Information

Demonstration circuit 862 is a micropower regulated charge pump DC/DC converter featuring the 60mA output LTC3221 in a 2mm × 2mm DFN package. It comes in three assembly versions, DC862A-A, DC862A-B and DC862A-C, featuring the LTC3221EDC-3.3 (fixed 3.3V output), the LTC3221EDC-5 (fixed 5V output) , and LTC3221EDC (adjustable output set to 3V), respectively. The demo board input voltage range depends on the IC used; for the 5V output DC862A-B, the input voltage range is 2.7V to 5.5V.

Resources

Documentation & Resources

Data Sheet

LTC3221: Micropower, Regulated Charge Pump in 2 x 2 DFN Data Sheet
11/21/2007
PDF

Reliability Data

R415 Reliability Data
3/23/2018
PDF

User Guide

DC862A - Demo Manual
9/24/2009
PDF

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice downloads and documentation

Models for the following parts are available in LTspice:

LTC3221

LTC3221-3.3

LTC3221-5

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
LTC3221EDC#TRMPBF	Material Declaration	Reliability Data	6-Lead DFN (2mm x 2mm w/ EP)	Ultra Librarian SamacSys
LTC3221EDC#TRPBF	Material Declaration	Reliability Data	6-Lead DFN (2mm x 2mm w/ EP)	Ultra Librarian SamacSys
LTC3221EDC-3.3#TRMPBF	Material Declaration	Reliability Data	6-Lead DFN (2mm x 2mm w/ EP)	Ultra Librarian SamacSys
LTC3221EDC-3.3#TRPBF	Material Declaration	Reliability Data	6-Lead DFN (2mm x 2mm w/ EP)	Ultra Librarian SamacSys
LTC3221EDC-5#TRMPBF	Material Declaration	Reliability Data	6-Lead DFN (2mm x 2mm w/ EP)	Ultra Librarian SamacSys
LTC3221EDC-5#TRPBF	Material Declaration	Reliability Data	6-Lead DFN (2mm x 2mm w/ EP)	Ultra Librarian SamacSys
Wafer Fabrication Data		R415 Reliability Data

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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.