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MAX4370ESA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
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.
General Description
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.
Applications
Hot Board Insertion
Solid-State Circuit Breaker
Features
♦ 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
MAX4370
†
Current-Regulating Hot-Swap Controller with
DualSpeed/BiLevel Fault Protection
________________________________________________________________
Maxim Integrated Products
1
N
M1
MAX4370
V
OUT
C
BOARD
CTIM
C
TIM
CSPD
C
SPD
ON
ON
GND
STAT
V
CC
R
SENSE
STAT
REMOVABLE CARDBACKPLANE
V
IN
VSEN GATE
GND
Typical Operating Circuit
19-1472; Rev 0; 4/99
PART
MAX4370ESA -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
8 SO
Ordering Information
DualSpeed/BiLevel is a trademark of Maxim Integrated Products.
†
Pg
Pin Configuration appears at end of data sheet.
MAX4370
Current-Regulating Hot-Swap Controller with
DualSpeed/BiLevel Fault Protection
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +2.7V to +13.2V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN
= +5V and T
A
= +25°C.) (Note 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress rating s only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: ON can be pulled below ground. Limiting the current to 2mA ensures that this pin is never lower than about -0.8V.
V
IN
to GND...........................................................................+15V
STAT to GND ..........................................................-0.3V to +14V
GATE to GND ..............................................-0.3V to (V
IN
+ 8.5V)
ON to GND (Note 1) ................................................. -1V to +14V
CSPD to GND.............-0.3V to the lower of (V
IN
+ 0.3V) or +12V
VSEN, CTIM to GND ....................................-0.3V to (V
IN
+ 0.3V)
Current into ON...................................................................±2mA
Current into Any Other Pin................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.9mW/°C above +70°C)........................... 471mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................ +300°C
Start-up is initiated only if V
GATE
is less than this
voltage
ON = V
IN
I
GATE
= 8.5µA, measured above V
IN
Measured with respect to V
IN
; voltage at which
internal clamp circuitry is triggered
During start-up (current regulation provided by
fast comparator)
Time from current overload to V
GATE
< 0.1V,
C
GATE
= 1000pF to GND (triggered by the fast
comparator during normal operation)
VSEN = V
IN
V
GATE
= V
IN
(Note 4)
CTIM = floating
10mV overdrive, from overload condition to GATE
discharging
V
IN
- VSEN
V
IN
- V
SEN
CSPD = floating
100nF on CTIM
100nF on CSPD to GND
CONDITIONS
V0.1Gate Overvoltage Threshold
V
2.7
5
Minimum Gate Drive Voltage
V6.7 7.5Maximum Gate Voltage
80
Gate Discharge Current
µs60t
OFF
Turn-Off Time
µA100I
GATE
Gate Charge Current
µs5.5
ms21 31 41
t
START
Start-Up Period
(Note 3)
mA0.6 1I
Q
Supply Current
V2.7 13.2V
IN
Input Voltage Range
µA0.2 10I
B,VSEN
VSEN Input Bias Current
ns460t
FCD
Fast Comparator Response
Time
mV180 200 220V
FC,TH
Fast Comparator Threshold
mV
45 50 55
V
SC,TH
Slow Comparator
Threshold
µs10 20 40
t
CSPD
Slow Comparator Response
Time
ms10 20 40
UNITSMIN TYP MAXSYMBOLPARAMETER
During turn-off, triggered by a fault in normal
operation or ON falling edge
µA
75 225 550
I
GATE,DIS
POWER SUPPLIES
MOSFET DRIVER
CURRENT CONTROL
V
IN
≥ 5V
V
IN
≥ 2.7V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
43.5 56
MAX4370
Current-Regulating Hot-Swap Controller with
DualSpeed/BiLevel Fault Protection
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +2.7V to +13.2V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN
= +5V and T
A
= +25°C.) (Note 2)
Note 2: All devices are 100% tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 3: The start-up period (t
START
) is the time during which the slow comparator is ignored and the device acts as a current limiter
by regulating the sense current with the fast comparator. It is measured from ON rising above 0.6V to STAT rising.
Note 4: The current available at GATE is a function of V
GATE
(see Typical
Operating Characteristics.
)
V
IN
= 5V, rising threshold
CONDITIONS
mV3V
HYST
Hysteresis
V0.575 0.6 0.625V
TH,ON
Threshold Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
2.7V ≤ V
IN
≤ 13.2V mV/V0.1 1PSRR
Power-Supply Rejection
Ratio
Input can be driven to the absolute maximum
limit without false output inversion
V-0.1 13.2
10mV overdrive
V
ON
Input Voltage Range
µs10t
D,COMP
Propagation Delay
µA0.001 1I
B,ON
Input Bias Current
To restart after a fault µs20t
RESTART
ON Pulse Width Low
V
STAT
≤ +13.2V µA1Output Leakage Current
I
SINK
= 1mA V0.4V
OL
Output Voltage Low
Start-up is initiated when this threshold is
reached at V
IN
V2.25 2.67V
UVLO
Threshold
mV100V
UVLO,HYST
Hysteresis
Time which input voltage must exceed under-
voltage lockout before start-up is initiated
ms100 150 200t
D,UVLO
UVLO to Start-Up Delay
DIGITAL OUTPUT (STAT)
ON COMPARATOR
V
IN
UNDERVOLTAGE LOCKOUT
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX4370ESA+

Mfr. #:
Buy MAX4370ESA+
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers Current-Regulating Hot-Swap Controller
Lifecycle:
New from this manufacturer.
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