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PDF MAX1508ZETA Data sheet ( Hoja de datos )
| Número de pieza | MAX1508ZETA | |
| Descripción | Linear Li Battery Charger with Integrated Pass FET / Thermal Regulation / and ACOKin 3mm x 3mm TDFN | |
| Fabricantes | Maxim Integrated | |
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19-2890; Rev 1; 10/03
EVAALVUAAILTAIOBNLEKIT
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
General Description
The MAX1508 is an intelligent, stand-alone constant-cur-
rent, constant-voltage (CCCV), thermally regulated linear
charger for a single-cell lithium-ion (Li+) battery. The
MAX1508 integrates the current-sense circuit, MOS pass
element, and thermal-regulation circuitry, and also elimi-
nates the reverse-blocking Schottky diode, to create the
simplest and smallest charging solution for hand-held
equipment.
The MAX1508 functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast-charge, top-off charge, and full-
charge indication. The MAX1508Y and MAX1508Z elimi-
nate the prequalification state to allow startup into a load
without a battery.
Proprietary thermal-regulation circuitry limits the die
temperature to +100°C when fast charging or while
exposed to high ambient temperatures, allowing maxi-
mum charging current without damaging the IC.
The MAX1508 achieves high flexibility by providing an
adjustable fast-charge current by an external resistor.
Other features include the charging status (CHG) of the
battery, an active-low control input (EN) for the
MAX1508 and MAX1508Z (active-high control input for
the MAX1508Y), and an active-low input power-source
detection output (ACOK).
The MAX1508 accepts a +4.25V to +13V supply, but dis-
ables charging when the input voltage exceeds +7V to
protect against unqualified or faulty AC adapters. The
MAX1508 operates over the extended temperature
range (-40°C to +85°C) and is available in a compact
8-pin thermally enhanced 3mm x 3mm thin DFN pack-
age with 0.8mm height.
Applications
Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
Features
o Stand-Alone Linear 1-Cell Li+ Battery Charger
o No External FET, Reverse-Blocking Diode, or
Current-Sense Resistor Required
o Programmable Fast-Charge Current (0.8A max)
o Proprietary Die-Temperature Regulation Control
(+100°C)
o +4.25V to +13V Input Voltage Range with Input
Overvoltage Protection (OVP) Above +7V
o Charge-Current Monitor for Fuel Gauging
o Low Dropout Voltage—130mV at 0.425A
o Input Power-Source Detection Output (ACOK)
o Soft-Start Limits Inrush Current
o No Prequalification State for the MAX1508Y and
MAX1508Z
o Charge Status Output (CHG) for LED or
Microprocessor Interface
o Small 3mm x 3mm 8-Pin Thin DFN Package,
0.8mm High
o Active-Low Charge Enable (EN) (MAX1508 and
MAX1508Z)
o Active-High Charge Enable (EN) (MAX1508Y)
Ordering Information
PART
TEMP RANGE
MAX1508ETA -40°C to +85°C
MAX1508YETA -40°C to +85°C
MAX1508ZETA -40°C to +85°C
*EP = Exposed paddle.
PIN-PACKAGE
8 Thin DFN-EP*
8 Thin DFN-EP*
8 Thin DFN-EP*
TOP
MARK
AHF
AIL
AIK
Pin Configuration
TOP VIEW
8 7 65
Typical Operating Circuit appears at end of data sheet.
MAX1508
MAX1508Y
MAX1508Z
1 2 34
3mm x 3mm THIN DFN
Bluetooth is a trademark of Ericsson.
( ) ARE FOR THE MAX1508Y ONLY
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
Pin Description
PIN NAME
FUNCTION
1 VL Internally Generated Logic Supply for Chip. Bypass VL to GND with a 0.47µF capacitor.
2 IN Input Supply Voltage. Bypass IN to GND with a 1µF capacitor to improve line noise and transient rejection.
3 GND Ground. Connect GND and exposed pad to a large copper trace for maximum power dissipation.
Charge-Current Program and Fast-Charge Current Monitor. Output current from ISET is 0.958mA per amp of
4 ISET battery charging current. The charging current is set by connecting a resistor from ISET to GND. Fast-charge
current = 1461V / RISETΩ.
5
EN
Logic-Level Enable Input (MAX1508/1508Z). Drive EN high to disable charger. Pull EN low or float for normal
operation. EN has an internal 200kΩ pulldown resistor.
EN Logic-Level Enable Input (MAX1508Y). Drive EN low to disable charger. Drive EN high for normal operation.
6
ACOK
Input Power-Detection Output. The open-drain ACOK output asserts low when +4.25V < VIN < +7V and VIN -
VBATT > 40mV. ACOK requires an external 100kΩ pullup resistor. ACOK is high impedance in shutdown.
7 BATT Li+ Battery Connection. Bypass BATT to GND with a capacitor of at least 1µF per ampere of charge current.
Charging Indicator, Open-Drain Output. CHG goes low (and can turn on an LED) when charging begins.
8 CHG CHG is high impedance when the battery current drops below 10% of the fast-charging current, or when EN
is high. Connect a pullup resistor to the µP’s I/O voltage when interfacing with a µP logic input.
— PAD Exposed Pad. Connect exposed pad to a large copper trace for maximum power dissipation. The pad is
internally connected to GND.
Detailed Description
The MAX1508 charger uses voltage, current, and ther-
mal-control loops to charge a single Li+ cell and to pro-
tect the battery (Figure 1). When a Li+ battery with a cell
voltage below 2.5V is inserted, the MAX1508 charger
enters the prequalification stage where it precharges that
cell with 10% of the user-programmed fast-charge cur-
rent. There is no prequalification stage for the MAX1508Z
and MAX1508Y in order to allow startup into a load with-
out a battery. The CHG indicator output is driven low
(Figure 2) to indicate entry into the prequalification state.
Once the cell has passed 2.5V, the charger soft-starts
before it enters the fast-charge stage. The fast-charge
current level is programmed through a resistor from ISET
to ground. As the battery voltage approaches 4.2V, the
charging current is reduced. If the battery current drops
to less than 10% of the fast-charging current, the CHG
indicator goes high impedance, signaling the battery is
fully charged. At this point the MAX1508 enters a con-
stant voltage-regulation mode to maintain the battery at
full charge. If, at any point while charging the battery, the
die temperature approaches +100°C, the MAX1508
reduces the charging current so the die temperature
does not exceed the temperature-regulation set point.
The thermal-regulation loop limits the MAX1508 die
temperature to +100°C by reducing the charge current
as necessary (see the Thermal Regulation section).
This feature not only protects the MAX1508 from over-
heating, but also allows higher charge current without
risking damage to the system.
MAX1508/MAX1508Z EN Charger
Enable Input
EN is a logic input (active low) to enable the charger.
Drive EN low, leave floating, or connect to GND to
enable the charger control circuitry. Drive EN high to
disable the charger control circuitry. EN has a 200kΩ
internal pulldown resistance.
MAX1508Y EN Charger Enable Input
EN is a logic input (active high) to enable the charger.
Drive EN high to enable the charger control circuitry.
Drive EN low to disable the charger control circuitry.
ACOK Output
Active-Low Output. The open-drain ACOK output
asserts low when +4.25V < VIN < +7V and VIN - VBATT
> 40mV. ACOK requires an external 100kΩ pullup
resistor to the system’s logic I/O voltage. ACOK is high
impedance in shutdown.
VL Internal Voltage Regulator
The MAX1508 linear charger contains an internal linear
regulator available on the VL output pin. VL requires a
0.47µF ceramic bypass capacitor to GND. VL is regulat-
ed to 3.3V whenever the input voltage is above 3.5V.
_______________________________________________________________________________________ 5
5 Page 
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and ACOK in 3mm x 3mm TDFN
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
COMMON DIMENSIONS
SYMBOL
A
D
E
A1
L
k
A2
MIN. MAX.
0.70 0.80
2.90 3.10
2.90 3.10
0.00 0.05
0.20 0.40
0.25 MIN.
0.20 REF.
PACKAGE VARIATIONS
PKG. CODE
N
D2
T633-1
T833-1
6 1.50–0.10
8 1.50–0.10
T1033-1
10 1.50–0.10
E2
2.30–0.10
2.30–0.10
2.30–0.10
e
0.95 BSC
0.65 BSC
0.50 BSC
JEDEC SPEC
MO229 / WEEA
MO229 / WEEC
MO229 / WEED-3
b [(N/2)-1] x e
0.40–0.05 1.90 REF
0.30–0.05 1.95 REF
0.25–0.05 2.00 REF
DALLAS
SEMICONDUCTOR
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 6, 8 & 10L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
APPROVAL
DOCUMENT CONTROL NO.
21-0137
REV.
D
2
2
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 ____________________ 11
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX1508ZETA.PDF ] | |
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