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参数资料
| 型号： | MAX1922ETB+TC3B |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH CURRENT-LIMIT 10-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | USB 开关 |
| 输出数： | 1 |
| Rds（开）： | 100 毫欧 |
| 内部开关： | 是 |
| 电流限制： | 1A |
| 输入电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
1A Current-Limited Switch for 2 USB Ports
Pin Description
PACKAGE
TDFN
6
1, 3, 9
5
7
2, 4,
8, 10
—
SO
1
2, 3
4
5
6, 7,
8
—
NAME
GND
IN
EN
OC
OUT
EP
FUNCTION
Ground
Input. p-channel MOSFET source—connect all IN pins together and bypass with a 1μF capacitor ground.
Active-Low Switch Enable Input. A logic-low turns on the switch.
Overcurrent-Indicator Output. This open-drain output goes low when the device is in thermal shutdown
or undervoltage lockout, or during a sustained (10ms) current-limit condition.
Switch Output. p-channel MOSFET drain—connect all OUT pins together and bypass with a 0.1μF
capacitor to ground.
TDFN Only. Exposed paddle. Connect to the GND plane for optimum thermal dissipation. This does not
remove the requirement for a proper ground.
Continuous Short-Circuit Protection
IN
OC
P
P
MAX1922
OUT
The MAX1922 is a short-circuit-protected switch. In the
event of an output short-circuit condition, the current
through the switch is foldback-current-limited to 1A
continuous.
Thermal Shutdown
N
REPLICA
AMPLIFIER
ON
P
The MAX1922 has a thermal shutdown feature. The
switch turns off and the OC output goes low immediate-
ly (no overcurrent blanking) when the junction tempera-
ture exceeds +165°C. When the MAX1922 cools 20°C,
the switch turns back on. If the fault short-circuit condi-
tion is not removed, the switch cycles on and off, result-
ing in a pulsed output.
10ms
TIMER
HOT
ON
CURRENT-LIMIT
AMPLIFIER
1.24V
OC Indicator
The MAX1922 provides an overcurrent output ( OC ). A
100k Ω pullup resistor from OC to IN provides a logic
control signal. This open-drain output goes low when
any of the following conditions occur:
EN
CONTROL
CIRCUITRY
GND
? The input voltage is below the 2.4V undervoltage
lockout (UVLO) threshold.
? The die temperature exceeds the thermal shutdown
Figure 1. Functional Diagram
Detailed Description
The MAX1922 p-channel MOSFET power switch limits
output current to 1.4A min and 2.1A max. When the out-
put current increases beyond the current limit (I LIMIT ),
the current also increases through the replica switch
(I OUT / 13000). The current-limit error amplifier com-
pares the voltage to the internal 1.24V reference and
regulates the current back to the I LIMIT (Figure 1).
These switches are not bidirectional; therefore, the
input voltage must be higher than the output voltage.
temperature limit of +165°C.
? The device is in current limit for greater than 10ms.
OC Blanking
The MAX1922 features 10ms overcurrent blanking.
Blanking allows brief current-limit faults, including
momentary short-circuit faults that occur when hot-
swapping a capacitive load, and ensures that no OC is
issued during power-up. When a load transient causes
the device to enter current limit, an internal counter
starts. If the load fault persists beyond the 10ms over-
current blanking timeout, the OC output asserts low.
Ensure that the MAX1922 input is adequately bypassed
to prevent input glitches from triggering spurious OC
6
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| MAX1924VEEE | 功能描述:电池管理 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 |
| MAX1924VEEE+ | 功能描述:电池管理 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 |
| MAX1924VEEE+T | 制造商:Maxim Integrated Products 功能描述:ADVANCED LI+ BATTERY-PACK PROTECTOR - Tape and Reel |
| MAX1924XEEE | 功能描述:电池管理 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 |
| MAX1924XEEE+ | 功能描述:电池管理 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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