EUP8084 Datasheet, PDF (1/23 Pages) Eutech Microelectronics Inc – Complete Linear Battery Charger with Integrated Buck Converter and LDO

EUP8084
Complete Linear Battery Charger with
Integrated Buck Converter and LDO
DESCRIPTION
The EUP8084 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, and a 300mA low dropout (LDO) linear
regulator. 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 and linear regulator, 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 EUP8084 linear regulator is designed for fast transient
response and good power supply ripple rejection.
Designed for 300mA of load current, it includes
short-circuit protection and thermal shutdown.
The EUP8084 is available in a 16-lead 3mm× 4mm TDFN
package and is rated over the -40°C to 85°C temperature
range.
FEATURES
z 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
z 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
z Linear Regulator:
- 300mA Output Current
- Low Dropout: 150mV at 300mA
- Fast Line and Load Transient Response
- High Accuracy: 1.5%
- 84µA Quiescent Current
z Short-Circuit, Over-Temperature, and Current
Limit Protection
z 3mm × 4mm TDFN-16 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Typical Application Circuit
APPLICATIONS
z Bluetooth Headsets
z Cellular Phones
z MP3 and Handheld Computers
z Portable Media Players
DS8084 Ver1.0 Apr. 2008
Figure 1.
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