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LTC4221IGN Datasheet

  • LTC4221IGN

  • Dual Hot Swap Controller/ Power Sequencer with Dual Speed, D...

  • 312.05KB

  • 28頁(yè)

  • LINER

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LTC4221
Dual Hot Swap Controller/
Power Sequencer with Dual Speed,
Dual Level Fault Protection
FEATURES
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
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DESCRIPTIO
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 V
OUT
for Overvoltage Protection
Latch Off or Automatic Retry on Current Fault
FAULT and PWRGD Outputs
Narrow 16-Pin SSOP Package
The LTC
廬
4221 is a 2-channel Hot Swap
TM
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 1碌s or 25mV for the
timeout delay (set by the C
FILTER
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.
APPLICATIO S
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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.
TYPICAL APPLICATIO
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE)
(MALE)
LONG
2-Channel Hot Swap Controller
V
CC1
3.3V
V
CC2
2.5V
0.004鈩?/div>
10鈩?/div>
100nF
*
100nF
10鈩?/div>
IRF7413
0.004鈩?/div>
IRF7413
LONG
*
SHORT
21k
10k
V
CC1
ON1
SENSE1 GATE1 V
CC2
SENSE2 GATE2
14.3k
FB2
5.11k
10k
10k
SHORT
13.3k
ON2
10k
LTC4221
FAULT
GND
TIMER
470nF
FAULT
GND
SHORT
LONG
*SMAJ10 (OPTIONAL)
FILTER
1nF
U
V
OUT1
3.3V/5A
V
OUT2
2.5V/5A
PWRGD2
PWRGD1
20k
U
U
PWRGD2
PWRGD1
FB1
5.11k
4221 TA01
4221f
1

LTC4221IGN 產(chǎn)品屬性

  • LTC4221

  • 100

  • 集成電路 (IC)

  • PMIC - 熱交換

  • -

  • 熱交換控制器

  • 通用

  • 無

  • -

  • 1 V ~ 13.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 16-SSOP（0.154"，3.90mm 寬）

  • 16-SSOP

  • 管件

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