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参数资料
| 型号： | MAX8844ZETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI+ DUAL 14TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 0 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX8844ZETD+TDKR |
28V Dual Input Linear Li+ Battery Chargers with
Battery Detection and Overvoltage-Protected Output
Detailed Description
The MAX8844Z/MAX8844Y chargers use voltage, cur-
rent, and thermal-control loops to charge a single Li+
cell and protect the battery (Figure 1). When a Li+ bat-
tery with a cell voltage below 2.5V is inserted, the
MAX8844Z/MAX8844Y chargers enter a prequalifica-
tion stage where they precharge that cell with 10% of
the user-programmed fast-charge current (Figure 2).
The CHG indicator is driven low to indicate entry into
the prequalification state. When the battery voltage
exceeds 2.5V, the charger soft-starts as it enters the
fast-charge stage. The fast-charge current level is pro-
grammed through a resistor from SETI to GND. As the
battery voltage approaches 4.2V, the battery current is
reduced. If the battery current drops to less than the
top-off current threshold set by R MIN , the charger
enters top-off mode and the CHG indicator goes high
impedance, signaling that the battery is fully charged.
Overvoltage-Protected Output (SAFEOUT)
SAFEOUT is a linear regulator that provides an output
voltage of 4.7V and can be used to supply low-voltage-
rated charging systems. The SAFEOUT linear regulator
turns on when V IN ≥ 4.25V regardless of EN and is dis-
abled when V IN is greater than the overvoltage thresh-
old (7.5V typ).
Overvoltage Protected Output (SAFEUSB)
SAFEUSB is a linear regulator that provides an output
voltage of 4.7V and can be used to supply low voltage
rated USB systems. The SAFEUSB linear regulator
turns on when V USB ≥ 4.25V regardless of EN and is
disabled when V USB is greater than the overvoltage
threshold (7.5V typ).
Battery Pack Detection Input (DETBAT)
DETBAT is a battery pack ID resistor detector that
enables the battery charger if pulled low through a
resistor that is less than 51k Ω . If DETBAT is left uncon-
nected or the pulldown resistor is 51k Ω or greater, the
battery charger is disabled.
POK Output
The open-drain POK output asserts low when 2.35V ≤
(V IN or V USB ) ≤ 7V, [(V IN or V USB ) - V BATT ] ≥ 40mV
(typ V IN or V USB rising), and DETBET is pulled low
through a resistor that is less than 51k Ω . POK is high
ASYNCHRONOUS
SHUTDOWN
CHARGER = DISABLED
FROM ANYWHERE
V IN * > 7.5V, OR
V BATT < 2.5V
(V IN * - V BATT ) < 30mV
CHG = HIGH-Z
V IN * > 7V, OR
(V IN * - V BATT ) < 30mV, OR
THERMAL SHUTDOWN, OR
IC DISABLED
(V IN * - V BATT ) < 30mV, OR
PRECHARGE
10% OF I FAST-CHARGE
CHG = LOW
V IN * < 7.5V, AND
(V IN * - V BATT ) ≥ 40mV, AND
IC ENABLED
IC DISABLED
V BATT < 2.4V
ANY CHARGING STATE
DIE TEMPERATURE > +115 ° C
CHARGING CURRENT REDUCTION
CHARGING CURRENT IS REDUCED
AS NECESSARY
V BATT ≥ 2.5V
DIE TEMPERATURE ≤ +115 ° C
I BATT > 248V/R MIN (k Ω ) - 16mA
FAST-CHARGE
CONSTANT-CURRENT CHARGE
100% OF I FAST-CHARGE
CHG = LOW
I BATT ≤ I MIN
TOP-OFF
4.2 VOLTAGE REGULATION
CHG = HIGH-Z
RETURN TO
CHARGING STATE
FOR 6.2ms (typ) OR LONGER
*SEE THE DC AND USB
POWER SUPPLIES SECTION.
Figure 2. Charge-State Diagram
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8844ZEVKIT+ | 功能描述:电源管理IC开发工具 MAX8844Y/Z Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX8845WETC+ | 功能描述:电池管理 28V 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 |
| MAX8845WETC+T | 功能描述:电池管理 28V 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 |
| MAX8845XETC+ | 功能描述:电池管理 28V 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 |
| MAX8845XETC+T | 功能描述:电池管理 28V 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 |
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