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参数资料
| 型号： | MAX8845ZETC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/19页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR LI+ 28V 12TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 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： | 12-WFQFN 裸露焊盘 |
| 供应商设备封装： | 12-TQFN 裸露焊盘（3x3） |
| 包装： | 管件 |
28V Linear Li+ Battery Chargers with Battery
Detection and Overvoltage Protected Output
ASYNCHRONOUS
SHUTDOWN
CHARGER = DISABLED
FROM ANYWHERE
V IN > OVP, OR
V BATT < 2.5V
(V IN - V BATT ) < 30mV
CHG = HIGH-Z
V IN > OVP, OR
(V IN - V BATT ) < 30mV, OR
THERMAL SHUTDOWN, OR
IC DISABLED
(V IN - V BATT ) < 30mV, OR
PRECHARGE
10% OF IFAST-CHARGE
CHG = LOW
V IN < OVP, 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
FAST-CHARGE
CONSTANT-CURRENT CHARGE
100% OF I FAST-CHARGE
CHG = LOW
I BATT > 295V/R MIN (k ? ) - 24mA
I BATT ≤ I MIN
TOP-OFF
4.2 VOLTAGE REGULATION
CHG = HIGH-Z
(MAX8845Z/MAX8845Y/MAX8845X)
4.35 VOLTAGE REGULATION (MAX8845W)
DIE TEMPERATURE ≤ +115 ° C
RETURN TO
CHARGING STATE
FOR 6.2ms (typ) OR LONGER
Figure 2. Charge-State Diagram
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 (MAX8845Z/MAX8845Y/MAX8845W) or
4.85V (MAX8845X) and can be used to supply low volt-
age- rated USB 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) (8.0V typ for MAX8845X only).
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 ? . If DETBAT is left uncon-
nected or the pulldown resistor is 51k ? or greater the
battery charger is disabled. If DETBAT is not used con-
nect DETBAT to GND for normal operation.
POK Output
The open-drain POK output asserts low when 2.35V ≤
V IN ≤ 7V (7.5V for MAX8845X only) and (V IN - V BATT ) ≥
40mV (typ V IN rising). POK is high impedance during
shutdown. When interfacing with a microprocessor
logic input, a pullup resistor to the microprocessor’s I/O
voltage may be required.
Autobooting Assistant
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W con-
tain autobooting assistant circuits that generate an
enable signal for system booting (ABO—MAX8845Z,
ABO —MAX8845Y/MAX8845X/MAX8845W). For the
MAX8845Z, the booting assistant functions as an internal
OR gate (Figure 1). The first input is dependant on the
input voltage (V IN ) and DETBAT while the second input
is an external signal applied to ABI. The first input ( POK )
is driven high once DETBAT is pulled low through a
resistor less than 51k ? , 2.35V ≤ V IN ≤ 7V (7.5V for only
MAX8845X), and (V IN - V BATT ) ≥ 40mV (typ V IN rising).
The second input signal (ABI) is driven by an external
source (Table 1). ABI enables an autoboot signal when
a battery is connected at BATT and is independent of
POK . If POK is pulled low, the booting assistant always
drives ABO high regardless of ABI. ABI is pulled to GND
through an internal 200k ? resistor. If ABI is supplied
from an outside exposed pin, a RC filter (Figure 4) is
required for ESD protection and noise filtering. If ABI is
supplied by a system’s internal GPIO, or logic, the RC
filter is not required. For the MAX8845Y/MAX8845X/
MAX8845W, the output ABO is only dependent on the
state of ABI (Table 1).
CHG Charge Indicator Output
CHG is an open-drain output that indicates charge sta-
tus. Table 2 describes the state of CHG during different
stages of operation. CHG is suitable for driving a charge
indication LED. If the MAX8845Z/MAX8845Y/MAX8845X/
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8845ZETC+ | 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 |
| MAX8845ZETC+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 |
| MAX8845ZEVKIT+ | 功能描述:电源管理IC开发工具 MAX8845Y/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 |
| MAX8847ZETE+ | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 6 WLEDS - Rail/Tube |
| MAX8848YETE+ | 制造商:Maxim Integrated Products 功能描述:NEGATIVE CHARGE PUMP FOR 7 WLEDS - Rail/Tube |
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