LTC4221IGN データシートの表示（PDF） - Linear Technology

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LTC4221IGN

Dual Hot Swap Controller/Power Sequencer with Dual Speed, Dual Level Fault Protection

Linear Technology 

LTC4221

Dual Hot Swap Controller/

Power Sequencer with Dual Speed,

Dual Level Fault Protection

FEATURES

■ Allows Safe Board Insertion and Removal from a

Live Backplane

■ Configurable Power Supply Sequencing

■ Soft-Start with Current Foldback Limits Inrush

Current

■ No External Gate Capacitor Required

■ Adjustable Dual Level Circuit Breaker Protection

■ Controls Supply Voltages from 1V to 13.5V

■ Independent N-Channel MOSFET High Side Drivers

■ FB Pin Monitors VOUT for Overvoltage Protection

■ Latch Off or Automatic Retry on Current Fault

■ FAULT and PWRGD Outputs

■ Narrow 16-Pin SSOP Package

U

APPLICATIO S

■ Electronic Circuit Breaker

■ Power Supply Sequencing

■ Live Board Insertion and Removal

■ Industrial High Side Switch/Circuit Breaker

, LTC and LT are registered trademarks of Linear Technology Corporation.

Hot Swap is a trademark of Linear Technology Corporation.

DESCRIPTIO

The LTC®4221 is a 2-channel Hot SwapTM controller that

allows a board to be safely inserted and removed from a

live backplane. Using two independent high side gate

drivers to control two external N-channel pass transistors,

the output voltages can be ramped up with current foldback

to limit the inrush current during the start-up period. No

external compensation capacitors are required at the

GATE pins. The two channels can be configured to ramp up

and down separately or simultaneously for supply volt-

ages ranging from 2.7V to 13.5V and 1V to 13.5V for

channels 1 and 2 respectively.

Each channel has two current limit comparators that

provide dual level and dual speed overcurrent circuit

breaker protection after the start-up period. If any current

sense voltage exceeds 100mV for 1μs or 25mV for the

timeout delay (set by the CFILTER at the FILTER pin), then

the FAULT latch is set and both GATE pins are pulled low.

The FB pins monitor the respective channel output volt-

ages and provide the inputs for the PWRGD comparators

as well as overvoltage protection.

TYPICAL APPLICATIO

2-Channel Hot Swap Controller

BACKPLANE PCB EDGE

CONNECTOR CONNECTOR

(FEMALE) (MALE)

VCC1

3.3V

LONG

VCC2

2.5V

LONG

*

SHORT

10Ω

100nF

21k

0.004Ω IRF7413

0.004Ω IRF7413

*

100nF

10k

10Ω

VCC1

ON1

SENSE1 GATE1 VCC2

SENSE2 GATE2 14.3k

FB2

5.11k

FAULT

GND

SHORT

13.3k

10k

SHORT

LONG

*SMAJ10 (OPTIONAL)

ON2

FAULT

GND

TIMER

LTC4221

470nF

PWRGD2

PWRGD1

FILTER FB1

1nF

VOUT1

3.3V/5A

VOUT2

2.5V/5A

10k 10k

PWRGD2

PWRGD1

20k

5.11k

4221 TA01

4221fa

1

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