MAX745EAP+ Maxim Integrated Products, MAX745EAP+ Datasheet

MAX745EAP+

Manufacturer Part Number

MAX745EAP+

Description

IC BATTERY CHARGER LI+ 20-SSOP

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX745EAP.pdf (8 pages)

Specifications of MAX745EAP+

Function

Charge Management

Battery Type

Lithium-Ion (Li-Ion)

Voltage - Supply

6 V ~ 24 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

20-SSOP

Output Voltage

5.4 V

Operating Supply Voltage

6 V to 24 V

Supply Current

4 mA

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Mounting Style

SMD/SMT

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 8
Download datasheet (130Kb)

The MAX745 provides all functions necessary for

charging lithium-ion (Li+) battery packs. It provides a

regulated charging current of up to 4A without getting

hot, and a regulated voltage with only ±0.75% total

error at the battery terminals. It uses low-cost, 1% resis-

tors to set the output voltage, and a low-cost N-channel

MOSFET as the power switch.

The MAX745 regulates the voltage set point and charg-

ing current using two loops that work together to transi-

tion smoothly between voltage and current regulation.

The per-cell battery voltage regulation limit is set

between 4V and 4.4V using standard 1% resistors, and

then the number of cells is set from 1 to 4 by pin-strap-

ping. Total output voltage error is less than ±0.75%.

For a similar device with an SMBus™ microcontroller

interface and the ability to charge NiCd and NiMH cells,

refer to the MAX1647 and MAX1648. For a low-cost Li+

charger using a linear-regulator control scheme, refer

to the MAX846A.

________________________Applications

19-1182; Rev 3; 10/01

SMBus is a trademark of Intel Corp.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Li+ Battery Packs

Desktop Cradle Chargers

Cellular Phones

Notebook Computers

Hand-Held Instruments

WITH 1% RESISTORS

CELL VOLTAGE

________________________________________________________________ Maxim Integrated Products

SET PER

(UP TO 24V)

SELECT

COUNT

CELL

General Description

OFF

STATUS

CELL0

CELL1

THM/SHDN

REF

SETI

VADJ

CCV

CCI

MAX745

DCIN

GND

IBAT

PGND

BATT

DLO

BST

DHI

Switch-Mode Lithium-Ion

o Charges 1 to 4 Li+ Battery Cells

o ±0.75% Voltage-Regulation Accuracy

o Provides up to 4A without Excessive Heating

o 90% Efficient

o Uses Low-Cost Set Resistors and

o Up to 24V Input

o Up to 18V Maximum Battery Voltage

o 300kHz Pulse-Width Modulated (PWM) Operation

o Stand-Alone Operation—No Microcontroller

____________________________Features

*Dice are tested at T

Pin Configuration appears at end of data sheet.

MAX745C/D

MAX745EAP

N-Channel Switch

Needed

Using 1% Resistors

Low-Noise, Small Components

PART

Typical Operating Circuit

Battery-Charger

= +25°C.

TEMP RANGE

40°C to +85°C

0°C to +70°C

Ordering Information

SENSE

VOUT

1–4 Li+ CELLS

(UP TO 18V)

CHARGE

PIN-PACKAGE

Dice*

20 SSOP

Related parts for MAX745EAP+

MAX745EAP+ Summary of contents

Page 1

... ON OFF SET PER CELL VOLTAGE WITH 1% RESISTORS SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Switch-Mode Lithium-Ion ____________________________Features o Charges Li+ Battery Cells o ±0.75% Voltage-Regulation Accuracy ...

Page 2

Switch-Mode Lithium-Ion Battery Charger ABSOLUTE MAXIMUM RATINGS DCIN to GND ............................................................-0.3V to 26V BST, DHI to GND ......................................................-0.3V to 30V BST to LX ....................................................................-0. DHI to LX............................................(LX - 0.3V) to (BST + 0.3V GND ................................................-0.3V to ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 18V 8.4V 0°C to +85°C. Typical values are at T DCIN BATT A PARAMETER ERROR AMPLIFIERS GMV Amplifier Transconductance GMI Amplifier Transconductance GMV Amplifier Output Current GMI Amplifier Output Current CCI ...

Page 4

Switch-Mode Lithium-Ion Battery Charger __________________________________________Typical Operating Characteristics (T = +25° 18V 4.2V, CELL0 = CELL1 = GND DCIN BATT noted.) BATTERY VOLTAGE vs. CHARGING CURRENT 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 R1 ...

Page 5

Description PIN NAME Current-Sense Amplifier’s Analog Current-Source Output. See the Monitoring Charge Current section for a 1 IBAT detailed description. 2 DCIN Charger Input Voltage. Bypass DCIN with a 0.1µF capacitor Chip Power Supply. Output of the ...

Page 6

Switch-Mode Lithium-Ion Battery Charger the voltage limit is 4.2V. Table 1 defines the REF battery cell count. The battery limit voltage is set by the following:       ...

Page 7

To set currents below full scale without changing R1, adjust the voltage at SETI according to the follow- ing formula SETI CHG FS A capacitor at CCI sets the current-feedback loop’s dominant pole. While ...

Page 8

Switch-Mode Lithium-Ion Battery Charger MOSFET Drivers The MAX745 drives external N-channel MOSFETs to switch the input source generating the battery voltage or current. Since the high-side N-channel MOSFET’s gate must be driven to a voltage higher than the input source ...

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