MAX5920AESA+T Datasheet MAX5920BESA+, MAX5920AESA+, MAX5920AESA+T | P1-P3

General Description

The MAX5920A/MAX5920B are hot-swap controllers that

allow a circuit card to be safely hot plugged into a live

backplane. The MAX5920A/MAX5920B operate from

-20V to -80V and are well-suited for -48V power systems.

These devices are pin and function compatible with the

LT4250 and pin compatible with the LT1640.

The MAX5920A/MAX5920B provide a controlled turn-on

to circuit cards preventing glitches on the power-supply

rail and damage to board connectors and components.

The MAX5920A/MAX5920B provide undervoltage, over-

voltage, and overcurrent protection. These devices

ensure the input voltage is stable and within tolerance

before applying power to the load.

Both the MAX5920A and MAX5920B protect a system

against overcurrent and short-circuit conditions by turn-

ing off the external MOSFET in the event of a fault con-

dition. The MAX5920A/MAX5920B also provide

protection against input voltage steps. During an input

voltage step, the MAX5920A/MAX5920B limit the cur-

rent drawn by the load to a safe level without turning off

power to the load.

Both devices feature an open-drain power-good status

output (PWRGD for the MAX5920A or PWRGD for the

MAX5920B) that can be used to enable downstream

converters. A built-in thermal-shutdown feature is also

included to protect the external MOSFET in case of

overheating.

The MAX5920A/MAX5920B are available in an 8-pin SO

package. Both devices are specified for the extended

-40°C to +85°C temperature range.

Applications

Telecom Line Cards

Network Switches/Routers

Central-Office Line Cards

Server Line Cards

Base-Station Line Cards

Features

♦ Allows Safe Board Insertion and Removal

from a Live -48V Backplane

♦ Pin- and Function-Compatible with LT4250L

(MAX5920A)

♦ Pin-Compatible with LT1640L (MAX5920A)

♦ Pin- and Function-Compatible with LT4250H

(MAX5920B)

♦ Pin-Compatible with LT1640H (MAX5920B)

♦ Circuit-Breaker Immunity to Input Voltage Steps

and Current Spikes

♦ Withstands -100V Input Transients with No

External Components

♦ Programmable Inrush and Short-Circuit Current

Limits

♦ Operates from -20V to -80V

♦ Programmable Overvoltage Protection

♦ Programmable Undervoltage Lockout

♦ Powers Up into a Shorted Load

♦ Power-Good Control Output

♦ Thermal Shutdown Protects External MOSFET

MAX5920

-48V Hot-Swap Controller

with External R

SENSE

________________________________________________________________ Maxim Integrated Products 1

GATE

SENSEV

DRAINOV

PWRGD

(PWRGD)

TOP VIEW

MAX5920A

MAX5920B

( ) FOR MAX5920B.

Pin Configuration

Ordering Information

19-2931; Rev 0; 8/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX5920AESA -40°C to +85°C 8 SO

MAX5920BESA -40°C to +85°C 8 SO

Typical Operating Circuit and Selector Guide appear at end

of data sheet.

MAX5920

-48V Hot-Swap Controller

with External R

SENSE

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= 0V, V

= 48V, T

= -40°C to +85°C. Typical values are at T

= +25°C, unless otherwise noted.) (Notes 1, 4)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

All Voltages are Referenced to V

, Unless Otherwise Noted.

Supply Voltage (V

- V

) .................................-0.3V to +100V

DRAIN, PWRGD, PWRGD ....................................-0.3V to +100V

PWRGD to DRAIN .............................................… -0.3V to +95V

PWRGD to V

........................................................-95V to +85V

SENSE (Internally Clamped) .................................-0.3V to +1.0V

GATE (Internally Clamped) ....................................-0.3V to +18V

UV and OV..............................................................-0.3V to +60V

Current Through SENSE ...................................................±40mA

Current into GATE...........................................................±300mA

Current into Any Other Pin................................................±20mA

Continuous Power Dissipation (T

= +70°C)

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature .....................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER SUPPLIES

Operating Input Voltage Range V

20 80 V

Supply Current I

(Note 2) 0.7 2 mA

GATE DRIVER AND CLAMPING CIRCUITS

Gate Pin Pullup Current I

GATE drive on, V

GATE

= V

-30 -45 -60 µA

Gate Pin Pulldown Current I

GATE drive off , V

GATE

= 2V 24 50 70 mA

External Gate Drive ∆V

GATE

- V

, 20V ≤ V

≤ 80V 10 13.5 18 V

GATE to V

Clamp Voltage V

GSCLMP

GATE

- V

, I

= 30mA 15 16.4 18 V

CIRCUIT BREAKER

Current-Limit Trip Voltage V

= V

SENSE

- V

40 50 60 mV

SENSE Input Bias Current V

SENSE

= 50mV -1 -0.2 0 µA

UNDERVOLTAGE LOCKOUT

Internal Undervoltage Lockout

Voltage High

UVLOH

increasing 13.8 15.4 17.0 V

Internal Undervoltage Lockout

Voltage Low

UVLOL

decreasing 11.8 13.4 15.0 V

UV PIN

UV High Threshold V

UVH

UV voltage increasing 1.240 1.255 1.270 V

UV Low Threshold V

UVL

UV voltage decreasing 1.105 1.125 1.145 V

UV Hysteresis V

UVHY_

130 mV

UV Input Bias Current I

INUV

-0.5 0 µA

OV PIN

OV High Threshold V

OVH

OV voltage increasing 1.235 1.255 1.275 V

OV Low Threshold V

OVL

OV voltage decreasing 1.189 1.205 1.221 V

OV Voltage Reference Hysteresis V

OVHY

50 mV

OV Input Bias Current I

INOV

= V

-0.5 0 µA

PWRGD OUTPUT SIGNAL REFERENCED TO DRAIN

DRAIN Input Bias Current I

DRAIN

= 48V 10 80 250 µA

MAX5920

-48V Hot-Swap Controller

with External R

SENSE

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= 0V, V

= 48V, T

= -40°C to +85°C. Typical values are at T

= +25°C, unless otherwise noted.) (Notes 1, 4)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

D RAIN Thr eshol d for P ow er - G ood V

DRAIN

- V

threshold for power-good

condition, DRAIN decreasing

1.1 1.7 2.0 V

GATE High Threshold V

∆V

GATE

- V

GATE

threshold for power-good

condition, ∆V

GATE

- V

GATE

decreasing

1.0 1.6 2.0 V

PWRGD, PWRGD Output

Leakage

PWRGD (MAX5920A) = 80V, V

DRAIN

= 48V,

PWRGD (MAX5920B) = 80V, V

DRAIN

= 0V

10 µA

PWRGD Output Low Voltage V

PWRGD

- V

EE;

DRAIN

- V

< V

SINK

= 5mA (MAX5920A)

0.11 0.4 V

PWRGD Output Low Voltage V

PWRGD

- V

DRAIN

; V

DRAIN

= 5V,

SINK

= 5mA (MAX5920B)

0.11 0.4 V

OVERTEMPERATURE PROTECTION

Overtemperature Threshold T

Junction temperature, temperature rising 135 °C

Overtemperature Hysteresis T

HYS

20 °C

AC PARAMETERS

OV High to GATE Low t

PHLOV

Figures 1a, 2 0.5 µs

UV Low to GATE Low t

PHLUV

Figures 1a, 3 0.4 µs

OV Low to GATE High t

PLHOV

Figures 1a, 2 3.3 µs

UV High to GATE High t

PLHVL

Figures 1a, 3 3.4 µs

SENSE High to GATE Low t

PHLSENSE

Figures 1a, 4a 1 3 µs

Current Limit to GATE Low t

PHLCL

Figures 1b, 4b 350 500 650 µs

MAX5920A, Figures 1a, 5a 1.8DRAIN Low to PWRGD Low

DRAIN Low to (PWRGD - DRAIN)

High

PHLDL

MAX5920B, Figures 1a, 5a 3.4

µs

MAX5920A, Figures 1a, 5b 1.6GATE High to PWRGD Low

GATE High to (PWRGD-DRAIN)

High

PHLGH

MAX5920B, Figures 1a, 5b 2.5

µs

TURN-OFF

Latch-Off Period t

OFF

(Note 3)

128 x

PHLCL

Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to V

unless otherwise specified.

Note 2: Current into V

with UV = 3V, OV, DRAIN, PWRGD, SENSE = V

, GATE = floating.

Note 3: Minimum duration of GATE pulldown following a circuit-breaker fault. The circuit breaker can be reset during this time by

toggling UV low, but the GATE pulldown does not release until t

OFF

has elapsed.

Note 4: Limits are 100% tested at T

= +25°C and +85°C. Limits at -40°C are guaranteed by design.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18

MAX5920AESA+T

Mfr. #:

Buy MAX5920AESA+T

Manufacturer:

Maxim Integrated

Description:

Hot Swap Voltage Controllers 48V- Hot-Swap Controller

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MAX5920AESA+T

MAX5920AESA+T

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