MAX34561 データシート ( 12V/5V Hot-Plug Switch )

部品番号

MAX34561

部品説明

12V/5V Hot-Plug Switch

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Maxim Integrated Products

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MAX34561 Datasheet, MAX34561 PDF,ピン配置, 機能

www.DataSheet.co.kr

19-5621; Rev 0; 11/10

12V/5V Hot-Plug Switch

General Description

The MAX34561 is a dual, self-contained, hot-plug switch

intended to be used on +12V and +5V power rails to limit

through current and to control the power-up output-volt-

age ramp. The device contains two on-board n-channel

power MOSFETs that are actively closed-loop controlled

to ensure that an adjustable current limit is not exceed-

ed. The maximum allowable current through the device

is adjusted by external resistors connected between the

LOAD and ILIM pins.

The device can control the power-up output-voltage

ramp. Capacitors connected to the VRAMP pins set

the desired voltage-ramp rate. The output voltages

are unconditionally clamped to keep input overvoltage

stresses from harming the load. The device also contains

adjustable power-up timers. Capacitors connected to

the TIMER pins determine how long after power-on reset

(POR) the device should wait before starting to apply

power to the loads. The TIMER pins can be driven with

a digital logic output to create a device-enable function.

The device contains an on-board temperature sensor

with hysteresis. If operating conditions cause the device

to exceed an internal thermal limit, the device either

unconditionally shuts down and latches off awaiting a

POR, or waits until the device has cooled by the hyster-

esis amount and then restarts.

RAID/Hard Drives

Servers/Routers

PCI/PCI ExpressM

InfiniBandTM/SM

Base Stations

Applications

Features

S Completely Integrated Hot-Plug Functionality for

+12V and +5V Power Rails

S Dual Version of the DS4560

S On-Board Power MOSFETs (68mI and 43mI)

S No High-Power RSENSE Resistors Needed

S Adjustable Current Limits

S Adjustable Output-Voltage Slew Rates

S Adjustable Power-Up Enable Timing

S Output Overvoltage Limiting

S On-Board Thermal Protection

S On-Board Charge Pump

S User-Selectable Latchoff or Automatic Retry

Operation

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX34561T+

-40NC to +85NC 24 TQFN-EP*

MAX34561T+T

-40NC to +85NC 24 TQFN-EP*

+Denotes a lead(Pb)-free/RoHS compliant package.

T = Tape and reel.

*EP = Exposed pad.

PCI Express is a registered trademark of PCI-SIG Corp.

InfiniBand is a trademark and service mark of InfiniBand Trade

Association.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Datasheet pdf - http://www.DataSheet4U.net/

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12V/5V Hot-Plug Switch

ELECTRICAL CHARACTERISTICS (continued)

(VCC5 = +5V, VCC12 = +12V, TJ = +25NC, unless otherwise noted.)

PARAMETER

5V MOSFET Output Capacitance

12V MOSFET Output

Capacitance

SYMBOL

COUT

(Note 4)

CONDITIONS

MIN TYP MAX UNITS

400 pF

5V and 12V Delay Time from

Enable to Beginning of

Conduction

tPOND CVRAMP_ = 1FF

8 ms

5V and 12V Gate-Charging Time

from Conduction to 90% of VOUT

Shutdown Junction Temperature

Thermal Hysteresis

TIMER_ Charging Current

VRAMP_ Charging Current

5V Overvoltage Clamp

12V Overvoltage Clamp

5V Power-On Short-Circuit

Current Limit

tGCT

TSHDN

THYS

ITIMER

IVRAMP

VOVC5

VOVC12

ISCL5

CVRAMP_ = 1FF, CLOAD_ = 1000FF

(Note 4)

RILIM5 = 47I (Note 5)

48 64 80

120 135 150

64 80 96

5.5 6.0 6.5

13.2 15 16.5

0.6 1.0 1.5

12V Power-On Short-Circuit

Current Limit

ISCL12 RILIM12 = 47I (Note 5)

0.6 1.0 1.5

5V Operating Overload Current

Limit

IOVL5 RILIM5 = 47I (Notes 4, 6)

1.5 2.5 3.7

12V Operating Overload Current

Limit

IOVL12 RILIM12 = 47I (Notes 4, 6)

1.00

1.8

2.6

5V VRAMP5 Slew Rate

12V VRAMP12 Slew Rate

ARD5 Pullup Resistor

ARD12 Pullup Resistor

SRVRAMP

RPU5

RPU12

CVRAMP5 = 1FF

CVRAMP12 = 1FF

0.16 0.19 0.23 V/ms

0.13 0.15 0.18 V/ms

100

Note 1: All voltages are referenced to ground. Currents entering the device are specified positive, and currents exiting the device

are negative.

Note 2: This supply range guarantees that the LOAD_ voltage is not clamped by the overvoltage limit.

Note 3: Supply current specified with no load on the LOAD_ pin.

Note 4: Guaranteed by design; not production tested.

Note 5: ISCL_ is the current limit when conduction begins.

Note 6: IOVL_ is the current limit after the on-board MOSFET is fully on.

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12V/5V Hot-Plug Switch

TOP VIEW

18 17 16 15 14 13

TIMER12 19

12 LOAD12

VRAMP12 20

11 ILIM12

ARD12 21

ARD5 22

MAX34561

10 GND

9 DNC

VRAMP5 23

TIMER5 24

EP 8 ILIM5

7 LOAD5

12 3 4 56

THIN QFN

(4mm × 4mm)

Pin Configuration

1, 2, 3

4–7

12–15

16, 17, 18

NAME

VCC5

LOAD5

ILIM5

DNC

GND

ILIM12

LOAD12

VCC12

TIMER12

VRAMP12

ARD12

Pin Description

FUNCTION

5V Supply Input. Power-supply input and n-channel power MOSFET drain connection. If the 5V side

is not used, connect this pin to GND.

5V Load Output. n-channel power MOSFET source connection.

5V Supply Current-Limit Adjust. A resistor from this pin to LOAD5 determines the current limit for

the 5V pass connection. For better accuracy, dedicate one LOAD pin to connect to ILIM through

RILIM. See the Applications Information section for more information.

Do Not Connect. Do not connect any signal to this pin.

Ground Connection

12V Supply Current-Limit Adjust. A resistor from this pin to LOAD12 determines the current limit for

the 12V pass connection. For better accuracy, dedicate one LOAD pin to connect to ILIM through

RILIM. See the Applications Information section for more information.

12V Load Output. n-channel power MOSFET source connection.

12V Supply Input. Power-supply input and n-channel power MOSFET drain connection. If the 12V

side is not used, connect this pin to GND.

12V Enable Delay Control. A capacitor connected to this pin determines the enable delay accord-

ing to the equation: Enable Delay = CTIMER12 x (VREF12/ITIMER).

12V Voltage Ramp Control. A capacitor connected to this pin determines the voltage ramp of the

LOAD12 output during turn-on according to the equation: dVLOAD12 = 2 x (IVRAMP/CVRAMP12).

12V Autoretry Disable. Connect this pin to GND to disable automatic retry functionality; the device

latches off during an overtemperature fault. Leave this pin open to enable automatic retry function.

This pin contains a pullup (RPU12) to 5V. This pin is only sampled on device power-on. If the 12V

side is not used, connect this pin to GND.

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