Power

Good

UVLO/EN

OVLO

PWR

GND

TIMER

PGD

OUT

VIN

SENSE GATE

LM25069

LM25069

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SNVS607E – FEBRUARY 2011 – REVISED MARCH 2013

LM25069 Positive Low Voltage Power Limiting Hot Swap Controller

Check for Samples: LM25069

1

FEATURES

APPLICATIONS

2

•

Operating R ange: +2.9V to +17V

•

Server Backplane Systems

•

In-rush Current Limit for Safe Board Insertion

•

Base Station Power Distribution Systems

into Live Power Sources

•

Solid State Circuit Breaker

•

Programmable Maximum Power Dissipation in

the External Pass Device

PACKAGE

•

Adjustable Current Limit

•

VSSOP-10

•

Circuit Breaker Function for Severe Over-

DESCRIPTION

Current Events

The LM25069 positive hot swap controller provides

•

Internal High Side Charge Pump and Gate

intelligent control of the power supply voltage to the

Driver for External N-channel MOSFET

load during insertion and removal of circuit cards from

•

Adjustable Under-Voltage Lockout (UVLO) and

a live system backplane or other "hot" power sources.

Hysteresis

The LM25069 provides in-rush current control to limit

•

Adjustable Over-Voltage Lockout (OVLO) and

system voltage droop and transients. The current limit

and power dissipation in the external series pass N-

Hysteresis

Channel

MOSFET

are

programmable,

ensuring

•

Initial Insertion Timer Allows Ringing and

operation within the Safe Operating Area (SOA). The

Transients to Subside After System

POWER GOOD output indicates when the output

Connection

voltage is within 1.3V of the input voltage. The input

•

Programmable Fault Timer Avoids Nuisance

under-voltage and over-voltage lockout levels and

Trips

hysteresis are programmable, as well as the initial

insertion delay time and fault detection time. The

•

Active High Open Drain POWER GOOD Output

LM25069-1 latches off after a fault detection, while

•

Available in Latched Fault and Automatic

the LM25069-2 automatically restarts at a fixed duty

Restart Versions

cycle. The LM25069 is available in a 10 pin VSSOP

package.

Typical Application

Figure 1. Positive Power Supply Control

1

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2

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Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

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