MAX8568AETE+T Maxim Integrated Products, MAX8568AETE+T Datasheet

MAX8568AETE+T

Manufacturer Part Number

MAX8568AETE+T

Description

IC BATT MANAGE LITH 16-TQFN

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8568AETET.pdf (17 pages)

Specifications of MAX8568AETE+T

Function

Back-Up Management

Battery Type

Lithium-Ion (Li-Ion); Nickel-Metal Hydride (NiMH)

Voltage - Supply

2.8 V ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

16-TQFN Exposed Pad

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 17
Download datasheet (746Kb)

The MAX8568A/MAX8568B backup-battery-management

ICs are complete charging and backup switchover con-

trol solutions for PDAs, Smart Phones, and other smart

portable devices. They charge both NiMH and

rechargeable lithium battery types and feature pro-

grammable charge current and termination voltage.

Separate optimized charge algorithms for both lithium

and NiMH cells are included on-chip.

The MAX8568A/MAX8568B also manage backup

switchover from a primary power source. An accurate on-

chip voltage detector monitors the main supply and

backs up two system supplies (typically I/O and memory)

when main power falls. On-chip drivers switch external

MOSFETs to disconnect the main supply from the system

loads so the backup source is not drained.

Low-voltage backup cells can be stepped up by an on-

chip synchronous-rectified, low-quiescent-current boost

converter. Additionally, a low-quiescent-current LDO gen-

erates a second backup voltage. The MAX8568A LDO is

preset to 2.5V while the MAX8568B LDO is preset to 1.8V.

Both devices are supplied in 16-pin 3mm x 3mm thin

QFN packages rated for -40°C to +85°C operation.

19-3450; Rev 1; 5/05

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.

TOP VIEW

PDAs and PDA Phones

Smart Phones

DSCs and DVCs

Palmtops and Wireless Handhelds

Internet Appliances and Web-Books

TERMV

STRTV

GND

REF

________________________________________________________________ Maxim Integrated Products

General Description

THIN QFN

MAX8568A

MAX8568B

Pin Configuration

Complete Backup-Management ICs

Applications

for Lithium and NiMH Batteries

OD2

OD1

LDO

BKSU

♦ Automatically Manage All Backup Switchover

♦ Charge Both NiMH and Rechargeable Lithium

♦ On-Chip Battery Boost Converter for 1-Cell NiMH

♦ Two Backup Output Voltages

♦ Programmable Charge Current

♦ Programmable Charge Voltage Limit

♦ Low 17µA Operating Current in Backup Mode

♦ Eliminate Many Discrete Components

♦ Tiny 3mm x 3mm Thin QFN Package

MAX8568AETE

MAX8568BETE

Functions

Backup Batteries

PART

MAIN BATTERY

2.8V TO 5.5V

I/O OUT

3.3V, 50mA

I/O IN

MEM OUT

1.8V OR 2.5V, 10mA

MEM IN

BATTERY

BACKUP

Typical Operating Circuit

-40°C to +85°C

TEMP RANGE

Ordering Information

BKSU

PGND

BKV

OD1

LDO

OD2

MAX8568A

MAX8568B

PIN-

PACKAGE

16 Thin QFN

3mm x 3mm

(T1633-4)

16 Thin QFN

3mm x 3mm

(T1633-4)

TERMV

STRTV

INOK

CHGI

NI/LI

GND

REF

Features

MARK

TOP

ACK

ACL

Related parts for MAX8568AETE+T

MAX8568AETE+T Summary of contents

Page 1

... REF THIN QFN ________________________________________________________________ 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. for Lithium and NiMH Batteries ♦ Automatically Manage All Backup Switchover Functions ♦ Charge Both NiMH and Rechargeable Lithium Backup Batteries ♦ ...

Page 2

Complete Backup-Management ICs for Lithium and NiMH Batteries ABSOLUTE MAXIMUM RATINGS IN, BK, BKSU, OD1, OD2 to GND.........................-0.3V to +6.0V BKV, LDO, NI/LI to GND.........................-0. REF, CHGI, INOK, TERMV, STRTV to GND...-0. PGND to GND ......................................................-0.3V ...

Page 3

Complete Backup-Management ICs ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 3.6V INOK R5 = 250kΩ 0°C to +85°C, unless otherwise noted. Typical values are PARAMETER NI/LI Input Current OD_ ...

Page 4

Complete Backup-Management ICs for Lithium and NiMH Batteries ELECTRICAL CHARACTERISTICS (Circuit of Figure 3.6V INOK R5 = 250kΩ -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER ...

Page 5

Complete Backup-Management ICs ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 3.6V INOK R5 = 250kΩ -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER LX Current Limit (ILIM) ...

Page 6

Complete Backup-Management ICs for Lithium and NiMH Batteries (Circuit of Figure 3.6V 1.4V CHARGE CURRENT vs. TEMPERATURE 11.0 10 3.6V 4.2V 127kΩ 10.6 10.4 ...

Page 7

Figure 3.6V MAIN-TO-BK TRANSITION WAVEFORMS MAX8658 toc13 3V V INOK 2V 2V/div MAX8568 PROVIDES 3.3V MAX1586 PROVIDES 3.3V 50mV/div V BKSU AC-COUPLED C3 = 22µF LOAD = 10mA SWITCHOVER POINT ...

Page 8

Complete Backup-Management ICs for Lithium and NiMH Batteries PIN NAME Main Battery Input. Connect to a 2.8V to 5.5V battery or other power source. Bypass with a 4.7µ ceramic capacitor to GND. Backup Battery Input. Connect to an ...

Page 9

Complete Backup-Management ICs Detailed Description The MAX8568A/MAX8568B are compact ICs for manag- ing backup battery charging and utilization in PDAs and other smart handheld devices. The MAX8568A/ MAX8568B are comprised of three major blocks multichemistry charger for small ...

Page 10

Complete Backup-Management ICs for Lithium and NiMH Batteries BK CHARGER IN 2.43V INOK I/O IN I/O OUT STEP-UP DC-DC CONVERTER OD1 MEM IN MEM OUT LDO OD2 Figure 1. Timing Diagram Applications Information Setting the Charge Current Charge current is ...

Page 11

Complete Backup-Management ICs The lithium charger acts like a current-limited voltage source. The battery regulation voltage for lithium mode is: BK(LIMAX 3 BK(LIMAX 1.2V, then the final charge voltage is 4.2V. ...

Page 12

Complete Backup-Management ICs for Lithium and NiMH Batteries Note that both V and V BK(NILO) BK(NIHI) 2-resistor voltage-divider as shown in the typical applica- tion circuit (see Figure 7) if the factory-set ratio between the two thresholds is acceptable. In ...

Page 13

Complete Backup-Management ICs The control scheme of the MAX8568 permits flexibility in choosing an inductor. A 10µH inductor performs well in most applications. Smaller inductance values typically offer smaller physical size for a given series resistance, allowing the smallest overall ...

Page 14

Complete Backup-Management ICs for Lithium and NiMH Batteries Pullup resistors, R3 and R4 in Figure 7, should be select ensure that when OD1 and OD2 go high imped- ance, the gate of the external MOSFET discharges within 50µs ...

Page 15

Complete Backup-Management ICs REF REF GND IN BK UVLO LI 1.13 LX BKSU PGND BKV OD1 LDO OD2 Figure 6. Functional Diagram ______________________________________________________________________________________ for Lithium and NiMH Batteries MAX8568 BK CHARGE CURRENT SOURCE 0.67 1 0.86 NI STEP-UP CONVERTER UVLO ...

Page 16

Complete Backup-Management ICs for Lithium and NiMH Batteries MAIN BATTERY 2.8V TO 5.5V BACKUP BATTERY 10µH I/O OUT 3.3V, 50mA OPEN I 0Ω R3 100kΩ MEM OUT 2.5V, 10mA MEM 100kΩ Figure 7. Typical Application ...

Page 17

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2005 Maxim Integrated Products ...

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