Datasheet > ADM1175

ADM1175

更新时间： 2024-11-29 04:31:19

品牌	Logo	应用领域
亚德诺 - ADI		监控控制器
页数	文件大小	规格书
24页	587K
描述
Hot Swap Controller and Digital Power Monitor with Convert Pin

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中文翻译

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数据手册

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ADM1175 数据手册

Hot Swap Controller and

Digital Power Monitor with Convert Pin

ADM1175

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Allows safe board insertion and removal from a live backplane

Controls supply voltages from 3.15 V to 16.5 V

Precision current sense amplifier

ADM1175-1

CONV

MUX

VCC

Precision voltage input

SDA

SCL

ADR

12-BIT

ADC

12-bit ADC for current and voltage readback

Charge pumped gate drive for external N-channel FET

Adjustable analog current limit with circuit breaker

3ꢀ accurate hot swap current limit level

Fast response limits peak fault current

Automatic retry or latch-off on current fault

Programmable hot swap timing via TIMER pin

Active-high and active-low ON/ONB pin options

Convert start pin (CONV)

I C

SENSE

CURRENT

SENSE

AMPLIFIER

FET DRIVE

GATE

CONTROLLER

1.3V

UV COMPARATOR

GND

TIMER

I²C® fast mode-compliant interface (400 kHz maximum)

10-lead MSOP

Figure 1.

APPLICATIONS

Power monitoring/power budgeting

Central office equipment

3.15V TO 16.5V

N-CHANNEL FET

SENSE

Telecommunication and data communication equipment

PCs/servers

VCC

SENSE

GATE

CONTROLLER

P = VI

ADM1175-1

GENERAL DESCRIPTION

SDA

SCL

The ADM1175 is an integrated hot swap controller and current

sense amplifier that offers digital current and voltage monitoring

via an on-chip, 12-bit analog-to-digital converter (ADC),

communicated through an I²C interface.

CONV

TIMER

ADR

GND

An internal current sense amplifier senses voltage across the sense

resistor in the power path via the VCC pin and the SENSE pin.

Figure 2. Applications Diagram

The ADM1175 limits the current through this resistor by control-

ling the gate voltage of an external N-channel FET in the power

path, via the GATE pin. The sense voltage (and, therefore, the

inrush current) is kept below a preset maximum.

A 12-bit ADC can measure the current seen in the sense resistor,

as well as the supply voltage on the VCC pin. An industry-standard

I²C interface allows a controller to read current and voltage data

from the ADC. Measurements can be initiated by an I²C command

or via the convert (CONV) pin. The CONV pin is especially

useful for synchronizing reads on multiple ADM1175 devices.

Alternatively, the ADC can run continuously, and the user can

read the latest conversion data whenever it is required. Up to four

unique I²C addresses can be created, depending on the way the

ADR pin is connected.

The ADM1175 protects the external FET by limiting the time

that it spends with maximum current running through it. This

current limit period is set by the choice of capacitor attached to

the TIMER pin. Additionally, the device provides protection from

overcurrent events that may occur once the hot swap event is

complete. In the case of a short-circuit event, the current in the

sense resistor exceeds an overcurrent trip threshold, and the

FET is switched off immediately by pulling down the GATE pin.

The ADM1175 is packaged in a 10-lead MSOP.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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