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PDF MAX8845Y Data sheet ( Hoja de datos )
| Número de pieza | MAX8845Y | |
| Descripción | 28V Linear Li+ Battery Chargers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4405; Rev 0; 3/09
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.datasheet4u.com
General Description
The MAX8845Z/MAX8845Y are intelligent, stand-alone
constant-current, constant-voltage (CCCV), thermally
regulated linear chargers designed for charging a sin-
gle-cell lithium-ion (Li+) battery. The MAX8845Z/
MAX8845Y integrate a current-sense circuit, MOSFET
pass element, thermal-regulation circuitry, and elimi-
nates 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 achieve high flexibility
by providing adjustable fast-charge currents
(SETI) and an adjustable top-off current threshold
(MIN) through external resistors. The MAX8845Z/
MAX8845Y feature a booting assistant circuit that dis-
tinguishes input sources and battery connection and
provides an enable signal (ABO—MAX8845Z and
ABO—MAX8845Y) for system booting.
The MAX8845Z/MAX8845Y also integrate an overvolt-
age-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 accept an input supply
range from 4.25V to 28V, but disables charging if the
supply voltage exceeds +7.5V to protect against
unqualified or faulty AC adapters. The IC’s operate over
the extended temperature range (-40°C to +85°C) and
are available in a compact 12-pin, thermally enhanced
thin QFN, 3mm x 3mm package (0.8mm max height).
Applications
Cellular and Cordless Phones
Smart Phones and PDAs
Digital Still Cameras
MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth® Equipment
Features
♦ CCCV, Thermally Regulated Linear 1-Cell Li+
Battery Charger
♦ No External MOSFET, Reverse Blocking Diode, or
Current-Sense Resistor
♦ Programmable Fast-Charge Currents (1ARMS max)
♦ Programmable Top-Off Current Threshold (MIN)
♦ Input Overvoltage Protected 4.7V Output
(SAFEOUT)
♦ Proprietary Die Temperature Regulation Control
(+115°C)
♦ 4.25V to 28V Input Voltage Range with Input
Overvoltage Protection Above +7.5V
♦ Low-Dropout Voltage (300mV at 500mA)
♦ Input Power-Source Detection Output (POK),
Charge Status Output (CHG), Charge-Enable Input
(EN)
♦ Output for Autobooting (ABO—MAX8845Z,
ABO—MAX8845Y)
♦ Tiny, 3mm x 3mm 12-Pin Thin QFN Package,
0.8mm Height (max)
Ordering Information
PART
PIN-PACKAGE
TOP
MARK
ABO
ACTIVE
STATE
MAX8845ZETC+ 12 Thin QFN-EP* ABL Active high
MAX8845YETC+ 12 Thin QFN-EP* ABM Active low
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.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.datasheet4u.com
Typical Operating Characteristics (continued)
(VIN = 5V, VBATT = 4V, RPOK = RCHG = 200kΩ to 5V, EN = unconnected, RSETI = 2.8kΩ to GND, RMIN = 1.74kΩ to GND, RDETBAT =
4.7kΩ to GND, CBATT = 2.2µF, TA = +25°C, unless otherwise noted.)
BATTERY REGULATION ACCURACY
vs. AMBIENT TEMPERATURE
1.0
0.8 IBATT = 0
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40
-15 10 35 60
AMBIENT TEMPERATURE (°C)
85
FAST-CHARGE CURRENT
vs. RSETI
1000
100
10
1
1 10 100 1000 10,000
RSETI (kΩ)
TOP-OFF CURRENT THRESHOLD
vs. 1/RMIN (kΩ)
600
550
500
450
TOP-OFF CURRENT RISING
400
350
300
250
200
150 TOP-OFF CURRENT FALLING
100
50
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9
1/RMIN (kΩ)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
700
600 VBATT = 4V
500
400 VBATT = 3.2V
300
200
100
0
-40
RSETI = 2.8kΩ
-20 0 20 40 60 80 100
AMBIENT TEMPERATURE (°C)
AUTOBOOT ENABLED BY ABI SIGNAL
(MAX8845Z)
MAX8845Z/Y toc14
VABI
VIN
VBATT
VABO
4μs/div
5V/div
0
5V/div
0
5V/div
0
5V/div
0
AUTOBOOT ENABLED BY INPUT VOLTAGE
(MAX8845Z)
MAX8845Z/Y toc15
VABI
VIN
VBATT
VABO
5V/div
0
5V/div
0
5V/div
0
5V/div
0
20μs/div
AUTOBOOT ENABLED BY ABI SIGNAL
(MAX8845Y)
MAX8845Z/Y toc16
5V/div
VABI 0
5V/div
VIN 0
VBATT
VABO
4μs/div
5V/div
0
5V/div
0
_______________________________________________________________________________________ 5
5 Page 
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
www.datasheet4u.com
AC ADAPTER
GND
CIN
1μF
IN BATT
MAX8845Z
DETBAT
ABI SAFEOUT
RSETI
2.8kΩ
ABO
SETI
MIN GND
RMIN
1.75kΩ
CHG
POK
EN
EP
4.2V Li+
CBATT
2.2μF
SYSTEM
CSAFEOUT VI/O
1μF
VBUS
RCHG
1MΩ
GPIO
RPOK
1MΩ
GPIO
GPIO
POWER
SUPPLY
ON
Figure 3. AC Adapter Application
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX8845Y.PDF ] | |
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