MAX4370ESA+ Maxim Integrated Products, MAX4370ESA+ Datasheet

IC CNTRLR HOT-SWAP 8-SOIC

MAX4370ESA+

Manufacturer Part Number
MAX4370ESA+
Description
IC CNTRLR HOT-SWAP 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Hot-Swap Controllerr
Datasheet
1.MAX4370ESA.pdf (16 pages)

Specifications of MAX4370ESA+

Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
2.7 V ~ 13.2 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX4370 is a circuit-breaker IC designed to offer
protection in hot-swap applications using Maxim’s
DualSpeed/BiLevel™ detection. This controller,
designed to reside either on the backplane or on the
removable card, is used to protect a system from start-
up damage when a card or board is inserted into a rack
with the main system power supply turned on. The
card’s discharged filter capacitors provide a low
impedance that can momentarily cause the main power
supply to collapse. The MAX4370 prevents this start-up
condition by providing inrush current regulation during
a programmable start-up period, allowing the system to
stabilize safely. In addition, two on-chip comparators
provide DualSpeed/BiLevel short-circuit protection and
overcurrent protection during normal operation.
The MAX4370 provides protection for a +3V to +12V
single supply. An internal charge pump generates the
controlled gate drive for an external N-channel MOS -
FET power switch. The MAX4370 latches the switch off
after a fault condition until an external reset signal
clears the device. Other features include a status pin to
indicate a fault condition, an adjustable overcurrent
response time, and a power-on reset comparator.
The MAX4370 is specified for the extended-industrial
temperature range (-40°C to +85°C) and is available in
an 8-pin SO package.
19-1472; Rev 0; 4/99
DualSpeed/BiLevel is a trademark of Maxim Integrated Products.
†
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Pg
Hot Board Insertion
Solid-State Circuit Breaker
Current-Regulating Hot-Swap Controller with
GND
STAT
ON
V
BACKPLANE
CC
________________________________________________________________ Maxim Integrated Products
General Description
REMOVABLE CARD
C
SPD
DualSpeed/BiLevel Fault Protection
Applications
STAT
ON
CSPD
V
IN
R
SENSE
VSEN
MAX4370
GND
Pin Configuration appears at end of data sheet.
M1
MAX4370ESA
GATE
DualSpeed/BiLevel Protection During Normal
Operation
Inrush Current Regulated at Start-Up
Resides Either on the Backplane or on the
Removable Card
Programmable Start-Up Period and Response
Time
Allows Safe Board Insertion and Removal from
Live Backplane
Protection for +3V to +12V Single Supplies
Latched Off After Fault Condition
Status Output Pin
Internal Charge Pump Generates Gate Drive for
External N-Channel MOSFET
N
PART
Typical Operating Circuit
-40°C to +85°C
TEMP. RANGE
CTIM
Ordering Information
C
C
TIM
BOARD
8 SO
PIN-PACKAGE
V
OUT
Features
1

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MAX4370ESA+ Summary of contents

Page 1

... REMOVABLE CARD V CC STAT GND ON C SPD DualSpeed/BiLevel is a trademark of Maxim Integrated Products. † Pg ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. DualSpeed/BiLevel Protection During Normal Operation Inrush Current Regulated at Start-Up ...

Page 2

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection ABSOLUTE MAXIMUM RATINGS V to GND...........................................................................+15V IN STAT to GND ..........................................................-0.3V to +14V GATE to GND ..............................................-0. GND (Note 1) ................................................. -1V to +14V CSPD to GND .............-0.3V to ...

Page 3

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection ELECTRICAL CHARACTERISTICS (continued +2.7V to +13.2V -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYMBOL ON COMPARATOR Threshold Voltage V TH,ON Hysteresis V ...

Page 4

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection (Circuit of Figure 5V 100mΩ FDS6670A SENSE wise noted.) SUPPLY CURRENT vs. INPUT VOLTAGE 1 ...

Page 5

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection (Circuit of Figure 5V 100mΩ FDS6670A SENSE wise noted.) GATE CHARGE CURRENT vs. GATE VOLTAGE 120 V = 12V IN 100 ...

Page 6

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection (Circuit of Figure 5V 100mΩ FDS6670A SENSE wise noted.) TURN-OFF TIME ( BOARD MAX4370- GATE (2V/div) (1A/div ...

Page 7

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection PIN NAME 1 V Supply Voltage Input. Connect to 2.7V to 13.2V VSEN Current-Sense Resistor Voltage Input GATE Gate Drive Output. Connect to gate of external N-channel MOSFET. 4 ...

Page 8

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection Detailed Description The MAX4370 is a circuit-breaker IC designed for hot- swap applications where a card or board inserted into a rack with the main system power supply turned on. ...

Page 9

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection STAT V GATE ~ OUT LIM I LOAD t OFF Figure 3. Response to a Fault Condition Slow Comparator The slow comparator is disabled at start-up while ...

Page 10

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection The status output is an open-drain output that goes low when the part is start-up 2) forced off (on = GND overcurrent condition latched off. STAT ...

Page 11

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection __________Applications Information Component Selection Select the external N-channel MOSFET according to the application’s current level. The MOSFET’s R should be chosen low enough to have a minimum volt - age drop at full ...

Page 12

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection Case A: Slow Turn-On (without overcurrent) There are two ways to turn on the MOSFET without reaching the fast comparator current limit the board capacitance (C BOARD inrush current is low. ...

Page 13

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection 1000 · t (ms) = 0.2 C (nF) CSPD SPD 100 10 1 0.1 0.01 0.01 0 (nF) SPD Figure 8. Slow Comparator Response Time vs. C The actual turn-on ...

Page 14

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection Using the MAX4370 on the Backplane The MAX4370 can be used on the backplane to regu- late current upon insertion of a removable card. This allows multiple cards with different input capacitance to ...

Page 15

Current-Regulating Hot-Swap Controller with DualSpeed/BiLevel Fault Protection HIGH-CURRENT PATH MAX4370 Figure 12. Kelvin Connections for the Current-Sense Resistors Pin Configuration TOP VIEW VSEN 2 MAX4370 GATE 3 GND 4 SO Chip Information TRANSISTOR COUNT: 1792 ______________________________________________________________________________________ SENSE ...

Page 16

... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products © ...

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