ADM1170-1AUJZ-RL7 查看數據表（PDF） - Analog Devices

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ADM1170-1AUJZ-RL7

1.6 V to 16.5 V Hot Swap Controller with Soft Start

Analog Devices 

Data Sheet

ADM1170

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

ADM1170-1AUJ

TIMER 1

8 VCC

GND 2 TOP VIEW 7 SENSE+

SS 3 (Not to Scale) 6 SENSE–

ON 4

5 GATE

Figure 2. Pin Configuration, 1AUJ Model

ADM1170-2AUJ

TIMER 1

8 VCC

GND 2 TOP VIEW 7 SENSE+

SS 3 (Not to Scale) 6 SENSE–

ON-CLR 4

5 GATE

Figure 3. Pin Configuration, 2AUJ Model

Table 4. Pin Function Descriptions

Pin No. Mnemonic

Description

1

TIMER

Timer Input Pin. The initial and circuit breaker timing cycles are set by this external capacitor. The initial timing

delay is 272.9 ms/μF, and 21.7 ms/µF for a circuit breaker delay. When the TIMER pin is pulled beyond the

upper threshold, the GATE turns off.

2

GND

Chip Ground Pin.

3

SS

Soft Start Pin. An external capacitor between the SS pin and GND sets the ramp rate of the current limit

reference.

4

ON (ON-CLR)

Input Pin. The ON (ON-CLR) pin is an input to a comparator that has a low-to-high threshold of 1.3 V with

80 mV hysteresis and a glitch filter. The ADM1170 is reset when the ON (ON-CLR) pin is low. When the ON

(ON-CLR) pin is high, the ADM1170 is enabled. A rising edge on this pin has the added function of clearing a

fault and restarting the device on the latched off model, the ADM1170-2.

5

GATE

Gate Output Pin. An internal charge pump provides a 12 µA pull-up current to drive the gate of an N-channel

MOSFET. In an overcurrent condition, the ADM1170 controls the external FET to maintain a constant load

current.

6, 7

SENSE−, SENSE+ Current Limit Sense Input Pins. The current limit is set via a sense resistor between the SENSE+ and SENSE−

pins. In an overcurrent condition, the gate of the FET is controlled to maintain the SENSE voltage at 50 mV.

When this limit is reached, the TIMER circuit breaker mode is activated. The circuit breaker limit can be

disabled by connecting the SENSE+ and SENSE− pins together.

8

VCC

Positive Supply Input Pin. The ADM1170 operates between 2.7 V to 16.5 V. An undervoltage lockout (UVLO)

circuit with a glitch filter resets the ADM1170 when the supply voltage drops below the specified UVLO limit.

Rev. A | Page 5 of 16

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