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参数资料
| 型号： | MAX1508Y |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Linear Li+ Battery Charger with Integrated Pass FET. Thermal Regulation. and ACOK-bar in 3mm x 3mm TDFN |
| 中文描述： | 线性Li+电池充电器，带有集成调整FET、热调节和ACOK，3mm x 3mm TDFN封装 |
| 文件页数： | 5/11页 |
| 文件大小： | 198K |
| 代理商： | MAX1508Y |
M
Linear Li+ Battery Charger with Integrated Pass FET,
Thermal Regulation, and
ACOK
in 3mm x 3mm TDFN
_______________________________________________________________________________________
5
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 200k
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 < V
IN
< +7V and V
IN
- V
BATT
> 40mV.
ACOK
requires an external 100k
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.
PIN
1
2
3
NAME
VL
IN
GND
FUNCTION
Internally Generated Logic Supply for Chip. Bypass VL to GND with a 0.47μF capacitor.
Input Supply Voltage. Bypass IN to GND with a 1μF capacitor to improve line noise and transient rejection.
Ground. Connect GND and exposed pad to a large copper trace for maximum power dissipation.
4
ISET
Charge-Current Program and Fast-Charge Current Monitor. Output current from ISET is 0.958mA per amp of
battery charging current. The charging current is set by connecting a resistor from ISET to GND. Fast-charge
current = 1461V / R
ISET
.
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 200k
pulldown resistor.
Logic-Level Enable Input (MAX1508Y). Drive EN low to disable charger. Drive EN high for normal operation.
5
EN
6
ACOK
Input Power-Detection Output. The open-drain
ACOK
output asserts low when +4.25V V
IN
+7V and V
IN
-
V
BATT
40mV.
ACOK
requires an external 100k
pullup resistor.
ACOK
is high impedance in shutdown.
Li+ Battery Connection. Bypass BATT to GND with a capacitor of at least 1μF per ampere of charge current.
7
BATT
8
CHG
Charging Indicator, Open-Drain Output.
CHG
goes low (and can turn on an LED) when charging begins.
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.
Pin Description
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1508YETA | 制造商:Maxim Integrated Products 功能描述:LINEAR LI+ BATT CHARGR W INTEGRATD - Rail/Tube |
| MAX1508YETA+ | 制造商:Maxim Integrated Products 功能描述:CHRGR LI-ION 800MA 4.2V 8TDFN EP - Rail/Tube |
| MAX1508YETA+T | 功能描述:电池管理 Linear Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1508YETA-T | 功能描述:电池管理 Linear Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1508ZETA | 制造商:Maxim Integrated Products 功能描述:LINEAR LI+ BATT CHARGR W INTEGRATD - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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