LTC4244-1 Linear Technology, LTC4244-1 Datasheet

LTC4244-1

Manufacturer Part Number

LTC4244-1

Description

CompactPCI Bus Hot Swap Controllers

Manufacturer

Linear Technology

Datasheet

1.LTC4244-1.pdf (28 pages)

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APPLICATIO S

FEATURES

TYPICAL APPLICATIO

Hot Swap is a trademark of Linear Technology Corporation.

CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.

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

Controls –12V, 3.3V, 5V and 12V Supplies

and –12V

Insensitive to Supply Voltage Transients

Adjustable Foldback Current Limit with Circuit Breaker

LOCAL_PCI_RST# Logic On-Chip

PRECHARGE Output Biases I/O Pins During Card

Insertion and Extraction

LTC4244-1 Designed for Applications without –12V

Available in 20-Lead Narrow SSOP Package

Hot Board Insertion into CompactPCI Bus

14.4V Absolute Maximum Rating for 12V

LONG V(I/O)

I/O PIN 128

LONG 3.3V

HEALTHY#

PCI_RST#

BD_SEL#

GROUND

LONG 5V

I/O PIN 1

–12V

3.3V

12V

Input Pins

•

I/O DATA LINE 1

I/O DATA LINE 128

Z1, Z2: SMAJ12A

R15

0.01 F

0.01 F PER

POWER PIN

R17

10k

0.01 F

R16

0.01 F

Z3, Z4: SMAJ5.0A

Figure 1. Typical Compact PCI Application

2.7

1.8

R22

R21

0.01 F

R20

1.2k

•

0.01 F PER

POWER PIN

R18 10k

R19 1k

3.3V

R13

R14

12V

OFF/ON

FAULT

PWRGD

RESETIN

3.3V

EEIN

GND PRECHARGE

R10 18

0.005

3.3V

SENSE

DESCRIPTIO

The LTC

allow a board to be safely inserted into and removed from

a CompactPCI

control the 5V and 3.3V supplies while on-chip switches

control the 12V supplies. The 3.3V and 5V supplies can

be ramped up at an adjustable rate. Electronic circuit

breakers protect all four supplies against overcurrent

faults. After the power-up cycle is complete, the TIMER pin

capacitor serves as auxiliary V

LTC4244-1 to function without interruption in the pres-

ence of voltage spikes on the 12V

output indicates when all four supplies are within toler-

ance. The OFF/ON pin is used to cycle board power or reset

the circuit breaker. The PRECHARGE output can be used

to bias the bus I/O pins during card insertion and extrac-

tion. PCI_RST# is combined on-chip with HEALTHY# in

order to generate LOCAL_PCI_RST#.

Rugged, CompactPCI Bus

R11

10k

IRF7457

GATE

C3 4.7nF

3.3V

R12

10k

LTC4244

OUT

4244/LTC4244-1 are Hot Swap

10%

R9 24

Hot Swap Controllers

0.007

MMBT2222A

DRIVE

SENSE

bus slot. External N-channel transistors

IRF7457

RESETOUT

R7 12

LTC4244/LTC4244-1

12V

R8 1k

TIMER

EEOUT

OUT

•

OUT

LOCAL_PCI_RST#

3.3V

0.33 F

LOAD(5VOUT)

LOAD(3.3VOUT)

0.082 F

LOAD(12VOUT)

LOAD(VEEOUT)

I/O #128

allowing the LTC4244/

I/O #1

supply. The PWRGD

RESET#

BRIDGE

10k

CHIP

PCI

4244 F01

controllers that

3.3V

12V

500mA

–12V

100mA

3.3V

OUT

EEOUT

OUT

42441f

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