DocumentationDatasheet
Reliability Data
LT Journal
- Jan 2008 - USB Compatible Li-Ion Battery Charger and Dual Buck Regulators in a Single 3mm × 3mm QFN
- September 2008 - New Family of Integrated Power Controllers Combine Fast Battery Charging, PowerPath Control and Efficient DC/DC Converters in Less Than 20mm2
Press Release
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Features
Battery Charger- Standalone USB Charger
- Up to 950mA Charge Current Programmable via Single Resistor
- HPWR Input Selects 20% or 100% of Programmed Charge Current
- NTC Input for Temperature Qualified Charging
- Internal Timer Termination
- Bad Battery Detection
- CHRG indicates C/10 or Timeout
- 400mA Output Current
- 2.25MHz Constant Frequency Operation
- Zero Current in Shutdown
- Low Noise Pulse Skip Operation or Power Saving Burst Mode Operation
- Low No Load Quiescent Current: 35μA
- Available in a Low Profile Thermally Enhanced 16-Lead 3mm × 3mm QFN Package
Typical Application
Description
The LTC3559/LTC3559-1 are USB battery chargers with dual high efficiency buck regulators. The parts are ideally suited to power single-cell Li-Ion/Polymer based handheld applications needing multiple supply rails.
Battery charge current is programmed via the PROG pin and the HPWR pin, with capability up to 950mA at the BAT pin. The battery charger has an NTC input for temperature qualified charging. The CHRG pin allows battery status to be monitored continuously during the charging process. An internal timer controls charger termination.
Each monolithic synchronous buck regulator provides up to 400mA of output current while operating at efficiencies greater than 90% over the entire Li-Ion/Polymer range. A MODE pin provides the flexibility to place both buck regulators in a power saving Burst Mode operation or a low noise pulse skip mode.
The LTC3559/LTC3559-1 are offered in a low profile thermally enhanced 16-lead (3mm × 3mm) QFN package.
3x3 QFN-16
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3559EUD#PBF | QFN | 16 | E | $3.07 | $2.15 |
| LTC3559EUD#TRPBF | QFN | 16 | E | $2.21 | |
| LTC3559EUD-1#PBF | QFN | 16 | E | $3.07 | $2.15 |
| LTC3559EUD-1#TRPBF | QFN | 16 | E | $2.21 |
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 |
|---|---|---|---|
| DC1085A | LTC3559EUD Demo Board | USB Li-Ion Linear Charger w/ Dual 400mA Buck Regulators | $125.00 |