EUP8086
Battery Charger and Step-Down
Converter for Portable Applications
DESCRIPTION
The EUP8086 is a complete constant-current/
constant-voltage linear battery charger for a single-cell
4.2V lithium-ion battery with a 600mA step-down
converter. The input voltage range is 3.75V to 5.5V for the
battery charger and 2.6V to 5.5V for the step-down
converter, making it ideal for applications operating with
single-cell lithium-ion/polymer batteries.
The battery charger offers an integrated pass device,
reverse blocking protection, high accuracy current and
voltage regulation, charge status, and charge termination.
The charging current is programmable via external resistor
from 15mA to 500mA. In addition to these standard
features, the device offers current limit, thermal protection,
and soft-start.
The step-down converter is a highly integrated converter
operating at a 1.5MHz switching frequency, minimizing
the size of external components while keeping switching
losses low. It has independent input and enable pins. The
output voltage ranges from 0.6V to the input voltage.
The EUP8086 is available in a 12-lead 3mm
×
3mm TDFN
package and is rated over the -40°C to 85°C temperature
range.
FEATURES
Battery Charger:
- Input Voltage Range : 3.75 V to 5.5V
- Constant-Current/Constant-Voltage Operation
with Thermal Feedback to Maximize Charge
Rate Without Risk of Overheating
- Internal 4.5 Hour Safety Timer for Termination
- Charge Current Programmable Up to 500mA
with 5% Accuracy
- C/10 Charge Current Detection Output
- 5µA Supply Current in Shutdown Mode
Synchronous Buck Converter:
- Input Voltage Range: 2.6V to 5.5V
- Output Voltage Range: 0.6V to V
IN
- 600mA Output Current
- Up to 90% Efficiency
- 36µA Quiescent Current
- 1.5MHz Switching Frequency
- 120µs Start-Up Time
Short-Circuit, Over-Temperature, and Current
Limit Protection
3mm
×
3mm TDFN-12 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
Bluetooth Headsets
Cellular Phones
Handheld Instruments
MP3 and Handheld Computers
Portable Media Players
Typical Application Circuit
Figure 1.
DS8086
Ver 1.0
Apr. 2008
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
