MAX1551
SOT23, Dual-Input, USB/AC Adapter, 1-Cell Li+ Battery Chargers
First Dual-Input, USB/AC-Adapter, Li+ Chargers in a SOT23 Package Require No External FETs or Diodes
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Key Features
Applications/Uses
| Charging VIN (V) (max) | 7 |
| Max. ICHG (A) | 0.28 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 |
| Protected VIN (V) (max) | 7 |
| Charger (V) | 4.2 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | TSOT/5 |
| Budgetary Price (See Notes) | 1.01 |
Simplified Block Diagram
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
Parameters
| Charging VIN (V) (max) | 7 |
| Max. ICHG (A) | 0.28 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 |
| Protected VIN (V) (max) | 7 |
| Charger (V) | 4.2 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | TSOT/5 |
| Budgetary Price (See Notes) | 1.01 |
Key Features
- Charge from USB or AC Adapter
- Automatic Switchover when AC Adapter is Plugged In
- On-Chip Thermal Limiting Simplifies Board Design
- Charge Status Indicator
- 5-Pin Thin SOT23 Package
Applications/Uses
- Cell Phones
- Digital Cameras
- PDAs
- Wireless Appliances
Description
On-chip thermal limiting simplifies PC board layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input voltage. When the MAX1551 and MAX1555 thermal limits are reached, the chargers do not shut down, but progressively reduce charging current.
The MAX1551 includes an active-low POK output to indicate when input power is present. If either charging source is active, active-low POK goes low. The MAX1555 instead features a active-low CHG output to indicate charging status.
With USB connected, but without DC power, charge current is set to 100mA (max). This allows charging from both powered and unpowered USB hubs with no port communication required. When DC power is connected, charging current is set at 280mA (typ). No input-blocking diodes are required to prevent battery drain.
The MAX1551 and MAX1555 are available in 5-pin thin SOT23 packages and operate over a -40°C to +85°C range.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
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