LT1303 - Micropower High Efficiency DC/DC Converters with Low-Battery Detector Adjustable and Fixed 5V
Datasheet 
DocumentationDatasheet
Spec Notice
Design Note
- DN109 - Micropower Buck/Boost Circuits, Part 1: Converting Three Cells to 3.3V*
- DN110 - Micropower Buck/Boost Circuits, Part 2: Converting Four Cells to 5V*
Reliability Data
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Features
- 5V at 200mA from a 2V Input
- Supply Voltage As Low As 1.8V
- Up to 88% Efficiency
- 120µA Quiescent Current
- Low-Battery Detector
- Low VCESAT Switch: 170mV at 1A Typ
- Uses Inexpensive Surface Mount Inductors
- 8-Lead PDIP or SO Package
Typical Application
Description
The LT1303/LT1303-5 are micropower step-up high efficiency DC/DC converters using Burst Mode operation. They are ideal for use in small, low-voltage battery-operated systems. The LT1303-5 accepts an input voltage between 1.8V and 5V and convertsit to a regulated 5V. The LT1303 is an adjustable version that can supply an output voltage up to 25V. Quiescent current is only 120µA from the battery and the shutdown pin further reduces current to 10µA. The low-battery detector provides an open-collector output that goes low when the input voltage drops below a preset level. The on-chip NPN power switch has a low 170mV saturation voltage at a switch current of 1A. The LT1303/1303-5 are available in 8-lead PDIP or SO packages, easing board space requirements. For higher output current, please see the LT1305 or LT1302.N-8,SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1303CN8#PBF | PDIP | 8 | C | $3.15 | $2.45 |
| LT1303CN8-5#PBF | PDIP | 8 | C | $3.15 | $2.45 |
| LT1303CS8#PBF | SO | 8 | C | $3.15 | $2.45 |
| LT1303CS8#TRPBF | SO | 8 | C | $2.51 | |
| LT1303CS8-5#PBF | SO | 8 | C | $3.15 | $2.45 |
| LT1303CS8-5#TRPBF | SO | 8 | C | $2.51 | |
| LT1303IN8-5#PBF | PDIP | 8 | I | $4.10 | $3.25 |
| LT1303IS8#PBF | SO | 8 | I | $4.25 | $3.35 |
| LT1303IS8#TRPBF | SO | 8 | I | $3.41 | |
| LT1303IS8-5#PBF | SO | 8 | I | $4.25 | $3.35 |
| LT1303IS8-5#TRPBF | SO | 8 | I | $3.41 | |
| LT1303CN8 | PDIP | 8 | C | $6.30 | $4.90 |
| LT1303CN8-5 | PDIP | 8 | C | $6.30 | $4.90 |
| LT1303CS8 | SO | 8 | C | $6.30 | $4.90 |
| LT1303CS8#TR | SO | 8 | C | $5.02 | |
| LT1303CS8-5 | SO | 8 | C | $6.30 | $4.90 |
| LT1303CS8-5#TR | SO | 8 | C | $5.02 | |
| LT1303IN8-5 | PDIP | 8 | I | $8.20 | $6.50 |
| LT1303IS8 | SO | 8 | I | $8.50 | $6.70 |
| LT1303IS8#TR | SO | 8 | I | $6.82 | |
| LT1303IS8-5 | SO | 8 | I | $8.50 | $6.70 |
| LT1303IS8-5#TR | SO | 8 | I | $6.82 |
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.