DocumentationDatasheet
Reliability Data
LT Journal
Press Release
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Features
- Selectable Dual Mode Operation: 1:1.5 or 1:2
- High Output Current: Up to 500mA
- Low Noise Constant Frequency (1MHz/0.9MHz) Operation
- VIN Range: 2.7V to 5.5V
- Adjustable Output Voltage (LTC3203/LTC3203B)
- User Selectable Fixed Output Voltages: 4.5V or 5V (LTC3203-1 and LTC3203B-1)
- Automatic Burst Mode® Operation with IQ ~ 120µA (LTC3203/LTC3203-1)
- Constant Freqency Operation at All Loads (LTC3203B/LTC3203B-1)
- Soft-Start Limits Inrush Current at Turn-On
- Short-Circuit/Thermal Protection
- Shutdown Disconnects Load from Input
- Shutdown Current: < 1µA
- Available in a 10-pin (3mm × 3mm) DFN Package
Typical Application
Description
The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 are low noise, high efficiency charge pump DC/DC converters capable of driving loads up to 500mA from a 2.7V to 5.5V input. Low external parts count (two flying capacitors and bypass capacitors at VIN and VOUT) make the LTC3203 family ideally suited for small, battery-powered applications.
Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. The LTC3203/ LTC3203-1 feature Burst Mode operation at light load to achieve high efficiency whereas the LTC3203B/ LTC3203B-1 operate at constant frequency to achieve lowest noise operation.
The LTC3203-1/LTC3203B-1 have a user selectable fixed output voltage of 4.5V or 5V to power LEDs or logic circuits. The FB pin of the LTC3203/LTC3203B can be used to program the desired output voltage. The parts are short circuit and over temperature protected and are available in a low profile (3mm × 3mm) DFN package.
3x3 DFN-10
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3203BEDD#PBF | DFN | 10 | E | $2.86 | $2.00 |
| LTC3203BEDD#TRPBF | DFN | 10 | E | $2.06 | |
| LTC3203BEDD-1#PBF | DFN | 10 | E | $2.86 | $2.00 |
| LTC3203BEDD-1#TRPBF | DFN | 10 | E | $2.06 | |
| LTC3203EDD#PBF | DFN | 10 | E | $2.86 | $2.00 |
| LTC3203EDD#TRPBF | DFN | 10 | E | $2.06 | |
| LTC3203EDD-1#PBF | DFN | 10 | E | $2.86 | $2.00 |
| LTC3203EDD-1#TRPBF | DFN | 10 | E | $2.06 | |
| LTC3203EDD-1 | DFN | 10 | E | $5.72 | $4.00 |
| LTC3203EDD-1#TR | DFN | 10 | E | $4.12 | |
| LTC3203BEDD-1 | DFN | 10 | E | $5.72 | $4.00 |
| LTC3203BEDD-1#TR | DFN | 10 | E | $4.12 | |
| LTC3203BEDD | DFN | 10 | E | $5.72 | $4.00 |
| LTC3203BEDD#TR | DFN | 10 | E | $4.12 | |
| LTC3203EDD | DFN | 10 | E | $5.72 | $4.00 |
| LTC3203EDD#TR | DFN | 10 | E | $4.12 |
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 |
|---|---|---|---|
| DC863A-A | LTC3203B Demo Board | Regulated Boost Charge Pump, 2.7V ≤ VIN ≤ 4V, Vout = 3.3V @ Up to 500mA | $100.00 | |
| DC863A-B | LTC3203-1 Demo Board | Regulated Boost Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout = 4.5V or 5V @ Up to 500mA | $100.00 | |
| DC863A-C | LTC3203B-1 Demo Board | Regulated Boost Charge Pump, 2.7V ≤ VIN ≤ 5.5V, Vout = 4.5V or 5V @ Up to 500mA | $100.00 |