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参数资料
| 型号： | MAX4920BETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/19页 |
| 文件大小： | 0K |
| 描述： | IC CTLR OVP/OCP BATT PWR 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 过压和过流控制器 |
| 应用： | 手机，数码相机，媒体播放器 |
| 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： | 带卷 (TR) |
MAX4919B/MAX4920B/MAX4921B
GN1 Driver
An internal 5.5V supply powers the on-chip charge
pump used to drive GN1 above IN, allowing the use of
a low-cost nFET. The GN1 voltage is approximately two
times VIN until VIN exceeds 5.5V, at which point, GN1
clamps to 9.5V (MAX4919B/MAX4920B) or 8.1V
(MAX4921B).
ACOK
ACOK is an active-low open-drain output that asserts
when VUVLO <VIN < VOVLO for the 25ms debounce
period. ACOK deasserts immediately to overvoltage
and undervoltage faults. Connect a pullup resistor from
ACOK to the logic I/O voltage of the host system.
PWR_ON
PWR_ON is one of the logic inputs that enables the
internal 1.8A switch. Drive PWR_ON high to turn on the
internal switch. PWR_ON also controls the logic output
ONOK. The ONOK open-drain output is the inverse of
the PWR_ON input state (see Figure 5). Note that
ONOK is high impedance when VIN < VUVLO, and VBTI
< 2.82V (typ). If VBTI is greater than 2.15V (typ), but
less than 2.82V (typ), PWR_ON and ONOK are dis-
abled and ONOK pulls high. When BTI rises above
2.82V (typ) again, PWR_ON is again enabled and
ONOK goes back to its previous logic level before a
low condition at BTI (see Figure 6).
Battery Switchover
An internal 1.8A (min) pFET with a 100m
(typ) RON
connects BTI to the load at BTO. The internal battery
switchover FET turns on when either HP_PWR,
PWR_ON, or PWR_HOLD is high. Note that when BTI
< 2.15V, the internal switch remains inactive, regard-
less of the logic control signals.
Battery Power-Up Logic with Overvoltage
and Overcurrent Protection
8
_______________________________________________________________________________________
UVLO
OVLO
IN
ACOK
ADAPTER
VOLTAGE
ACOK
ONE-SHOT
P2
STATUS
OFF
ON
25ms DEBOUNCE PERIOD
OFF
t1SHAC
Figure 1. ACOK One-Shot Timing Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4921BETD+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4921BETD+T | 功能描述:电池管理 Battery Power-Up Logic 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 |
| MAX4924ELT+T | 功能描述:开关变换器、稳压器与控制器 Overvoltage Protector RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MAX4925ELT+ | 制造商:Maxim Integrated Products 功能描述:OVP PROTECTOR WITH EXTERNAL PFET - Bulk |
| MAX4925ELT+T | 功能描述:开关变换器、稳压器与控制器 Overvoltage Protector RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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