MAX8845XETC+ Maxim Integrated Products, MAX8845XETC+ Datasheet

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MAX8845XETC+

Manufacturer Part Number
MAX8845XETC+
Description
IC BATT CHARGER CCCV 28V 12TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8845WETC.pdf (19 pages)

Specifications of MAX8845XETC+

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
0 V ~ 28 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
12-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W are
intelligent, stand-alone constant-current, constant-volt-
age (CCCV), thermally regulated linear chargers
designed for charging a single-cell lithium-ion (Li+) bat-
tery. The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W
integrate a current-sense circuit, MOSFET pass element,
thermal-regulation circuitry, and eliminate the external
reverse-blocking Schottky diode to create the simplest
and smallest charging solutions for handheld equipment.
The ICs control the charging sequence from the pre-
qualification state through constant current fast-charge,
top-off charge, and full-charge indication. Proprietary
thermal-regulation circuitry limits the die temperature
during fast-charging or when the ICs are exposed to
high ambient temperatures, allowing maximum charg-
ing current without damaging the ICs.
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W
achieve high flexibility by providing adjustable fast-
charge currents (SETI) and an adjustable top-off cur-
rent threshold (MIN) through external resistors. The
MAX8845Z/MAX8845Y/MAX8845X/MAX8845W feature
a booting assistant circuit that distinguishes input
sources and battery connection and provides an
enable signal (ABO—MAX8845Z and ABO—
MAX8845Y/MAX8845X/MAX8845W) for system booting.
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W also
integrate an overvoltage-protected output (SAFEOUT) for
low voltage-rated USB or charger inputs in system, and a
battery-pack detection circuit (DETBAT) that disables the
charger when the battery pack is absent. Other features
include an active-low control input (EN), an active-low
input power source detection output (POK), and a fully
charged top-off threshold detection output (CHG).
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W
accept an input supply range from 4.25V (4.4V for
MAX8845W only) to 28V, but disable charging if the
supply voltage exceeds +7.5V (+8.0V for MAX8845X
only) to protect against unqualified or faulty AC
adapters. The ICs operate over the extended tempera-
ture range (-40°C to +85°C) and are available in a com-
pact 12-pin, thermally enhanced thin QFN, 3mm x 3mm
package (0.8mm max height).
19-4340; Rev 1; 9/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
28V Linear Li+ Battery Chargers with Battery
Cellular and Cordless Phones
Smart Phones and PDAs
Digital Still Cameras
MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth
Detection and Overvoltage Protected Output
®
________________________________________________________________ Maxim Integrated Products
Equipment
General Description
Applications
o CCCV, Thermally Regulated Linear 1-Cell Li+
o No External MOSFET, Reverse Blocking Diode, or
o Programmable Fast-Charge Currents (1A
o Programmable Top-Off Current Threshold (MIN)
o Input Overvoltage Protected 4.7V Output
o Proprietary Die Temperature Regulation Control
o 4.25V (4.4V for MAX8845W only) to 28V Input
o Low-Dropout Voltage (300mV at 500mA)
o Input Power-Source Detection Output (POK),
o Output for Autobooting (ABO—MAX8845Z,
o Tiny, 3mm x 3mm 12-Pin Thin QFN Package,
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
Bluetooth is a registered trademark of Bluetooth SIG.
MAX8845ZETC+
MAX8845YETC+
MAX8845XETC+
MAX8845WETC+
Battery Charger
Current-Sense Resistor
(MAX8845Z/MAX8845Y/MAX8845W) or 4.85V
(MAX8845X) (SAFEOUT)
(+115°C)
Voltage Range with Input Overvoltage Protection
Above +7.5V (+8.0V for MAX8845X only)
Charge Status Output (CHG), Charge-Enable Input
(EN)
ABO—MAX8845Y/MAX8845X/MAX8845W)
0.8mm Height (max)
PART
PIN-PACKAGE
12 Thin QFN-EP*
12 Thin QFN-EP*
12 Thin QFN-EP*
12 Thin QFN-EP*
Ordering Information
MARK
ABM
TOP
ABQ
ABR
ABL
Features
RMS
Active high
Active low
Active low
Active low
ACTIVE
STATE
ABO
max)
1

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MAX8845XETC+ Summary of contents

Page 1

... Output for Autobooting (ABO—MAX8845Z, ABO—MAX8845Y/MAX8845X/MAX8845W) o Tiny, 3mm x 3mm 12-Pin Thin QFN Package, 0.8mm Height (max) PART MAX8845ZETC+ MAX8845YETC+ MAX8845XETC+ MAX8845WETC+ Note: All devices are specified over the -40°C to +85°C oper- ating temperature range. Applications + Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. ...

Page 2

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output ABSOLUTE MAXIMUM RATINGS IN to GND ...............................................................-0.3V to +30V ABI, BATT, EN, POK, ABO, ABO, CHG, DETBAT, SETI, MIN, SAFEOUT to GND ................................................-0. BATT ...

Page 3

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output ELECTRICAL CHARACTERISTICS (continued) = 1MΩ to BATT unconnected 5V 4V, R POK IN BATT +85°C, unless otherwise noted. Typical values are ...

Page 4

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output = 200kΩ unconnected 5V 4V POK CHG IN BATT 4.7kΩ to GND 2.2µF, T ...

Page 5

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output = 200kΩ unconnected 5V 4V POK CHG IN BATT 4.7kΩ to GND 2.2µF, T ...

Page 6

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output PIN MAX8845Y/ NAME MAX8845X/ MAX8845Z MAX8845W 1 1 SETI 2 2 DETBAT 3 3 ABI GND POK — ABO ABO ...

Page 7

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output LINEAR REGULATOR WITH OVP IN SETI V I MINREF MIN OVLO BATT VL UVLO DETBAT MAX8845Z MAX8845Y MAX8845X MAX8845W Figure 1. MAX8845Z/MAX8845Y/MAX8845X/MAX8845W Functional Diagram Detailed ...

Page 8

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output ( < 30mV IN BATT V < 2.5V BATT PRECHARGE 10% OF IFAST-CHARGE CHG = LOW ANY CHARGING STATE V < 2.4V BATT ≥ 2.5V ...

Page 9

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output Table 1. Autobooting Output States ABI BATT Low Present High Present Low Not present Low Present High Present ≥ 2V and Not Present indicates that the battery is ...

Page 10

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output Capacitor Selection Connect a ceramic capacitor from BATT to GND for proper stability. Use a 2.2µF ceramic capacitor for most applications. Connect a 1µF ceramic capacitor from IN ...

Page 11

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output C IN 1µF AC ADAPTER GND R SETI 2.8kΩ Figure 3. AC Adapter Application ______________________________________________________________________________________ 4.2V Li+ IN BATT C BATT 2.2µF MAX8845Z DETBAT ABI SAFEOUT V C ...

Page 12

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output 4.2V R ABI 10kΩ INTERFACE CONNECTOR GND R 2.8kΩ Figure 4. Factory System Interface Connector Application 12 ______________________________________________________________________________________ IN BATT BATT 1µF 2.2µF MAX8845Z DETBAT ...

Page 13

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output C IN 1µF MINI-USB CONNECTOR GND R R SETIA SETI 15.4kΩ 3.42kΩ Figure 5. Mini USB Battery Charger ______________________________________________________________________________________ 4.2V Li+ IN BATT C BATT 2.2µF MAX8845Z DETBAT ...

Page 14

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output POK POK CHG V = 4.7V SAFEOUT (4.85V FOR MAX8845X ONLY) V SAFEOUT Figure 6. Timing Diagram 14 ______________________________________________________________________________________ OVP OVP TIME ...

Page 15

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output 4.25V (4.4V FOR MAX8845W ONLY) TO 28V 1µF ABI OFF EN ON MIN R MIN 1.75kΩ SETI R SET 2.80kΩ (MAX8845Y/MAX8845X/MAX8845W, ABO) GND ______________________________________________________________________________________ DETBAT ...

Page 16

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output TOP VIEW MAX8845Z IN 11 SAFEOUT 12 *EXPOSED PAD + ______________________________________________________________________________________ TOP VIEW 7 6 POK IN GND 5 SAFEOUT EN 4 ...

Page 17

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 12 Thin QFN-EP (3mm x 3mm) E MARKING E/2 AAAA D ...

Page 18

Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output For the latest package outline information and land patterns www.maxim-ic.com/packages. PKG 12L 3x3 REF. MIN. NOM. MAX. A 0.70 0.75 0.80 b 0.20 0.25 0.30 2.90 ...

Page 19

... 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 ____________________ 19 © 2009 Maxim Integrated Products ...

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