ESMT EMC5040 Schematics

ESMT/EMP

EMC5040

Standalone Linear Li-Ion Charger with

Thermal Regulation

General Description

The EMC5040 is a complete linear charger for single

cell lithium-ion batteries. With small TDFN-10

package and few external components, EMC5040 is

well suited for portable applications. In addition, the

EMC5040 is specifically designed to work within USB

power specifications.

No external sense resistor and blocking diode are

required. Charging current can be programmed

externally with a single resistor. The built-in thermal

regulation facilitates charging with maximum power

without risk of overheating.

The EMC5040 always preconditions the battery with

1/10 of the programmed charge current at the

beginning of a charge cycle, after it verifies that the

battery can be fast-charged. The EMC5040

automatically terminates the charge cycle when

the charge current drops to 1/10th the programmed

value after the final float voltage is reached.

The EMC5040 features 13.5V maximum rating

voltage for AC adapter, and it provides the charge

current up to 1.2A. Other features include battery

temperature monitoring, reverse current protection,

shutdown mode, charging current monitor, under

voltage lockout, automatic recharge and status

indicator.

Features

g Programmable charge current up to 1.2A

g No MOSFET, sense resistor or blocking diode

required

g Complete linear charger in TDFN-10 for single

cell li-ion batteries

g Thermal regulation maximizes charge rate

without risk of overheating

g Thermistor input for temperature qualified

charging

g Charges single cell Li-ion batteries directly

from USB port.

g Preset 4.2V charge voltage with ±1%

accuracy

g Automatic recharge

g Charge status indicator

g C/10 charge termination

g Battery reverse leakage current less than 1uA

Applications

g Wireless handsets

g Hand-held instruments

g Portable information appliances

Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Jun. 2011

Revision: 1.1 1/19

ESMT/EMP

EMC5040

Typical Application Circuit

3.7V Li-Ion

EMC5040

Battery Pack

ACIN =

4.5V~13.5V

1k

1uF

Complete Charger Cycle

V

BAT

2.9V
Precharge
Threshold

I

BAT

V

Ise t

1k

ACIN

CHG_SB

PGOODB

GND

BATT

TS

ENB

ISETA

Programmed Charge Current

1

1uF

RSET

1uF

4.05V

Recharg e

Threshold

1/10 Programmed

Charge Current

Fast Charg e

Fast Ch arg e

Phase

Phase

Constant Voltage

Phase

Standby

Phase

Re-charge

Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc. Publication Date: Jun. 2011

Revision: 1.1 2/19

Phase