EVALUATION KIT AVAILABLE

Click

here

for production status of specific part numbers.

MAX16126/MAX16127

Load-Dump/Reverse-Voltage Protection Circuits

General Description

The MAX16126/MAX16127 load-dump/reverse-voltage

protection circuits protect power supplies from damaging

input voltage conditions, including overvoltage, reverse-

voltage, and high-voltage transient pulses. Using a

built-in charge pump, the devices control two external

back-to-back n-channel MOSFETs that turn off and

isolate downstream power supplies during damaging

input conditions, such as an automotive load-dump pulse

or a reverse-battery condition. Operation is guaranteed

down to 3V to ensure proper operation during automotive

cold-crank conditions. These devices feature a flag output

(FLAG) that asserts during fault conditions.

For reverse-voltage protection, external back-to-back

MOSFETs outperform the traditional reverse-battery

diode, minimizing the voltage drop and power dissipation

during normal operation.

The MAX16126/MAX16127 use external resistors to

adjust the overvoltage and undervoltage comparator

thresholds for maximum flexibility.

The MAX16127 provides limiter-mode fault management

for overvoltage and thermal shutdown conditions; whereas

the MAX16126 provides switch-mode fault management

for overvoltage and thermal shutdown conditions. In the

limiter mode, the output voltage is limited and

FLAG

is

asserted low during a fault. In the switch mode, the external

MOSFETs are switched off and

FLAG

is asserted low

after a fault. The switch mode is available in four options:

latch mode, 1 autoretry mode, 3 autoretry mode, and

always autoretry mode.

The MAX16126/MAX16127 are available in 12-pin TQFN

packages. These devices operate over the automotive

temperature range (-40°C to +125°C).

Benefits and Features

●

Increases Protection of Sensitive Electronic

Components in Harsh Environments

• -36V to +90V Wide Input-Voltage Protection Range

• Fast Gate Shutoff During Fault Conditions with

Complete Load Isolation

• Thermal-Shutdown Protection

• Active-Low

FLAG

Output Identifies Fault Condition

●

AEC-Q100 Automotive Qualified

• Operates Down to +3V, Riding Out Cold-Crank

Conditions

• -40°C to +125°C Operating Temperature Range

●

Integration Reduces Solution Size

• Internal Charge-Pump Circuit Enhances External

n-Channel MOSFET

• Adjustable Undervoltage/Overvoltage Thresholds

• 3mm x 3mm, 12-Pin TQFN Package

●

Reduced Power Dissipation Compared to Discrete

Solutions

• Minimal Operating Voltage Drop for Reverse-

Voltage Protection

•

350μA (max) Supply Current and 100μA (max)

Shutdown Current at 30V Input

Applications

●

Automotive

●

Industrial

●

Avionics

●

Telecom/Server/Networking

Ordering Information

appears at end of data sheet.

19-6053; Rev 9; 9/18

MAX16126/MAX16127

Load-Dump/Reverse-Voltage Protection Circuits

Absolute Maximum Ratings

(All pins referenced to GND.)

IN ............................................................................-36V to +90V

SHDN

...........................................-0.3V to max (0V, V

IN

+ 0.3V)

TERM ...........................................-0.3V to max (0V, V

IN

+ 0.3V)

SRC, GATE ............................................................-36V to +45V

SRC to GATE .........................................................-36V to +36V

OUT .......................................................................-0.3V to +45V

FLAG

.....................................................................-0.3V to +45V

OVSET, UVSET.......................................................-0.3V to +6V

Continuous Sink/Source (all pins) ..................................±100mA

Continuous Power Dissipation (T

A

= +70°C) (multilayer board)

TQFN (derate 14.7mW/°C above +70°C)............... 1176.5mW

Operating Temperature Range ......................... -40°C to +125°C

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

Storage Temperature Range ............................ -60°C to +150°C

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

Soldering Temperature (reflow) .......................................+260°C

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.

Package Thermal Characteristics

(Note 1)

TQFN

Junction-to-Ambient Thermal Resistance (θ

JA

)

..........68°C/W

Junction-to-Case Thermal Resistance (θ

JC

)

...............11°C/W

Note 1:

Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer

board. For detailed information on package thermal considerations, refer to

www.maximintegrated.com/thermal-tutorial.

Electrical Characteristics

(V

IN

= 12V, C

GATE-SOURCE

= 1nF, T

A

= -40°C to +125°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 2)

PARAMETER

Input Voltage Range

SYMBOL

V

IN

CONDITIONS

Operating range

Protection range

V

IN

= V

SRC

=

V

OUT

= 12V

V

IN

= V

SRC

=

V

OUT

= 30V

V

IN

= 12V

V

IN

= 30V

MIN

3

-36

224

260

34

64

136

240

TYP

MAX

30

+90

320

350

50

100

200

350

2.92

100

V

IN

rising

1.2

1.225

0.05 x

V

TH

0.9 x

V

IN

0.87 x

V

IN

0.7

1.2

1.25

µA

V

nA

V

kΩ

µA

UNITS

V

SHDN = high

Input Supply Current

I

IN

SHDN = low

SRC Input Current

IN Undervoltage Lockout

OVSET/UVSET Input Current

OVSET/UVSET Threshold (Rising)

OVSET/UVSET Threshold Hysteresis

POK Threshold Rising

POK Threshold Falling

TERM On-Resistance

I

SRC

V

UVLO

I

UVSET/OVSET

V

TH

V

TH-HYS

V

POK+

V

POK-

R

TERM

V

SRC

= V

IN

= 12V, SHDN = high

V

SRC

= V

IN

= 30V, SHDN = high

V

IN

rising

www.maximintegrated.com

Maxim Integrated

│

2

MAX16126/MAX16127

Load-Dump/Reverse-Voltage Protection Circuits

Electrical Characteristics (continued)

(V

IN

= 12V, C

GATE-SOURCE

= 1nF, T

A

= -40°C to +125°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 2)

PARAMETER

Startup Response Time

Autoretry Timeout

GATE Rise Time

OVSET-to-GATE Propagation Delay

UVSET-to-GATE Propagation Delay

Output Input Resistance to GND

OVSET-to-FLAG Propagation Delay

SYMBOL

t

START

t

RETRY

t

RISE

t

OVG

t

UVG

R

OUT

t

OV

V

GATE

rising (GND to V

SRC

+ 8V)

V

OVSET

rising (V

TH

- 100mV to

V

TH

+ 100mV)

V

UVSET

falling (V

TH

+ 100mV to

V

TH

- 100mV)

MAX16126

MAX16127

V

OVSET

rising (V

TH

- 100mV to

V

TH

+ 100mV)

V

IN

= V

SRC

= V

OUT

= 3V,

I

GATE

= -1FA

GATE Output Voltage High Above

V

SRC

V

IN

= V

SRC

= V

OUT

= 12V,

I

GATE

= -1FA

V

IN

= V

SRC

= V

OUT

= 24V,

I

GATE

= -1FA

V

IN

= V

SRC

= V

OUT

= 30V,

I

GATE

= -1FA

GATE Pulldown Current

GATE Charge-Pump Current

Thermal Shutdown

Thermal-Shutdown Hysteresis

SHDN Logic-High Input Voltage

SHDN Logic-Low Input Voltage

SHDN Input Pulse Width

SHDN Input Pulldown Current

FLAG Output Voltage Low

FLAG Leakage Current

I

PD

I

GATE

T

+

δT

V

IH

V

IL

t

PW

I

SPD

V

OL

I

IL

FLAG sinking 1mA

V

FLAG

= 12V

6

0.8

1.2

0.4

0.5

1.4

0.4

V

GATE

= 12V

V

IN

= V

GATE

= V

SRC

= 12V

5

8

7

6.25

8.8

180

+145

15

20

4

2

0.3

5

9

8.5

8

5.5

10

V

10

9.5

mA

µA

°C

V

µs

µA

V

µA

(Note 3)

CONDITIONS

MIN

TYP

150

1

0.55

MAX

UNITS

µs

ms

µs

MΩ

µs

V

GS

Note 2:

All parameters are production tested at T

A

= +25°C. Limits over the operating temperature range are guaranteed by design.

Note 3:

The MAX16126/MAX16127 power up with the external MOSFETs in off mode (V

GATE

= V

SRC

). The external MOSFETs turn

on t

START

after the IC is powered up and all input conditions are valid.

www.maximintegrated.com

Maxim Integrated

│

3

MAX16126/MAX16127

Load-Dump/Reverse-Voltage Protection Circuits

Typical Operating Characteristics

(V

IN

= 12V, T

A

= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX16126 toc01

SUPPLY CURRENT vs. TEMPERATURE

MAX16126 toc02

300

SHDN = HIGH

GATE ENHANCED

250

SUPPLY CURRENT (µA)

200

150

100

50

0

10

20

SUPPLY VOLTAGE (V)

30

310

290

SUPPLY CURRENT (µA)

270

250

230

210

190

170

150

SHDN = HIGH

GATE ENHANCED

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

90

SUPPLY CURRENT (µA)

80

70

60

50

40

30

20

SHDN = LOW

MAX16126 toc03

100

40

-40 -20

0

20

40

60

80

100 120

10

0

6

12

18

24

30

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX16126 toc04

SHDN PULLDOWN CURRENT

vs. TEMPERATURE

MAX16126 toc05

GATE-TO-SOURCE VOLTAGE

vs. SUPPLY VOLTAGE

9

GATE-TO-SOURCE VOLTAGE (V)

8

7

6

5

4

3

2

1

0

MAX16126 toc06

50

45

SUPPLY CURRENT (µA)

40

35

30

25

20

15

10

SHDN = LOW

1.0

0.9

SHDN PULLDOWN CURRENT (µA)

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

10

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

0

5

10

15

20

25

30

35

V

IN

(V)

GATE-TO-SOURCE VOLTAGE

vs. TEMPERATURE

MAX16126 toc07

GATE PULLDOWN CURRENT

vs. TEMPERATURE

V

GATE

= 12V

V

SRC

= GND

MAX16126 toc08

GATE-PULLUP CURRENT

vs. SUPPLY VOLTAGE

180

GATE PULL-UP CURRENT(µA)

160

140

120

100

80

60

40

20

0

MAX16126 toc09

10.0

9.6

GATE-TO-SOURCE VOLTAGE (V)

9.2

8.8

8.4

8.0

7.6

7.2

6.8

6.4

6.0

20

GATE PULLDOWN CURRENT (mA)

17

14

11

8

5

200

V

IN

= V

SRC

= V

OUT

= 12V

GATE ENHANCED

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C )

V

IN

= V

GATE

= V

SRC

GATE ENHANCED

0

5

10

15

V

IN

(V)

20

25

30

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

www.maximintegrated.com

Maxim Integrated

│

4

MAX16126/MAX16127

Load-Dump/Reverse-Voltage Protection Circuits

Typical Operating Characteristics (continued)

(V

IN

= 12V, T

A

= +25°C, unless otherwise noted.)

OVSET THRESHOLD vs. TEMPERATURE

MAX16126 toc10a

UVSET THRESHOLD vs. TEMPERATURE

MAX16126 toc10b

1.5

RISING

1.3

OVSET THRESHOLD (V)

1.1

FALLING

0.9

0.7

0.5

1.5

RISING

1.3

UVSET THRESHOLD (V)

1.1

FALLING

0.9

0.7

0.5

FLAG OUTPUT LOW VOLTAGE

vs. CURRENT

MAX16126 toc11

0.5

0.4

FLAG VOLTAGE (V)

0.3

0.2

0.1

0

0.5

1.0

FLAG CURRENT (mA)

1.5

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

2.0

OVERVOLTAGE FAULT TO GATE

PROPAGATION DELAY vs. TEMPERATURE

V

OVSET

PULSED FROM

(V

TH

- 100mV) TO (V

TH

+ 100mV)

PROPAGATION DELAY (µs)

0.75

MAX16126 toc12

REVERSE CURRENT

vs. REVERSE VOLTAGE

MAX16126 toc13

1.00

30

25

REVERSE CURRENT (µA)

20

15

10

5

0.50

0.25

0

-40 -25 -10 5 20 35 50 65 80 95 110 125

TEMPERATURE (°C)

0

5

10

15

20

25

30

REVERSE VOLTAGE (V)

www.maximintegrated.com

Maxim Integrated

│

5

参数名称	属性值
Manufacture	Maxim Integrated
产品种类 Product Category	Supervisory Circuits
RoHS	Yes
工厂包装数量 Factory Pack Quantity	100
类型 Type	Voltage Supervisory

MAX16126TCA/V+

MAX16126TCA/V+概述

MAX16126TCA/V+规格参数

文档预览

推荐资源