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MAX4272ESA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
Typical Operating Circuit
N
M1
MAX4271
MAX4272
V
OUT
C
BOARD
CTIM
CSPD
C
TIM
ON
ON
GND
STAT
V
CC
R
SENSE
STAT
REMOVABLE CARD
2.7V TO 13.2V
BACKPLANE
IN SENSE GATE
GND
General Description
The MAX4271/MAX4272/MAX4273 comprise a com-
plete family of integrated 3V to 12V hot-swap con-
trollers. They allow the safe insertion and removal of
circuit cards into live backplanes.
The discharged filter capacitors of the circuit card pro-
vide a low impedance to the live backplane. High in-
rush currents from the backplane to the circuit card can
burn up connectors and components, or momentarily
collapse the backplane power supply leading to a sys-
tem reset. This family of hot-swap controllers prevents
such problems by regulating the current to a preset
limit when the board is plugged in, allowing the system
to stabilize safely. After the startup cycle is completed,
two on-chip comparators provide DualSpeed/BiLevel™
protection against short circuits, load glitches, and
overcurrent conditions. In the event of a fault condition,
the load is disconnected. Fault recovery is handled by
unlatching (MAX4271), autoretry (MAX4272), or pro-
grammed (MAX4273) methods.
The MAX4271 family includes many integrated features
that reduce component count and design time. An on-
board charge pump provides the gate drive for a low-
cost, external n-FET. Integrated features like startup
current regulation and current glitch protection eliminate
external timing resistors and capacitors. Also featured
are an open-drain status output to indicate a fault condi-
tion, and an adjustable overcurrent response time.
The MAX4271 (latched fault protection) and MAX4272
(autoretry fault protection) come in 8-pin SO packages.
The MAX4273 (full function) comes in the space-saving
16-pin QSOP package and 16-pin SO package. All
parts are specified across the extended temperature
range, and have an absolute maximum rating of 15V to
provide extra protection against inductive kickback dur-
ing board removal.
Features
♦ Provide Safe Hot Swap for +3V to +12V Power
Supplies with Few External Components
♦ Unique Current Regulation Architecture
Minimizes n-FET Linear Mode Duration
♦ Autoretry Feature (MAX4272/MAX4273)
♦ DualSpeed/BiLevel Current Limit Protects Against
Current Glitches and Short Circuits
♦ Power-On RESET (MAX4273)
♦ 15V Absolute Maximum Rating Protects Against
Inductive Kickbacks During Board Removal
♦ Internal Charge Pump Generates Gate Drive for
External n-MOSFET
♦ Status Output Pin Indicates Fault/Safe Condition
♦ Space-Saving 8-Pin SO, 16-Pin QSOP Packages
________________________Applications
MAX4271/MAX4272/MAX4273
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, DualSpeed/BiLevel Fault Protection
________________________________________________________________ Maxim Integrated Products 1
19-1694; Rev 2; 12/07
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
DualSpeed/BiLevel is a trademark of Maxim Integrated
Products.
Pin Configurations appear at end of data sheet.
Base Stations
RAID
Remote-Access Servers
Network Routers and
Switches
ISDN
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX4271ESA
-40°C to +85°C
8 SO
S8-1
MAX4272ESA
-40°C to +85°C
8 SO
S8-1
MAX4273EEE
-40°C to +85°C
16 QSOP
E16-1
MAX4273ESE
-40°C to +85°C
16 SO
E16-1
MAX4271/MAX4272/MAX4273
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, 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 3)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: GATE can be pulled below LLMON, but current must be limited to 2mA.
Note 2: INC and ON can be pulled below ground. Limiting the current to 2mA ensures that these pins are never lower than about -0.8V.
IN to GND ............................................................................+15V
STAT, OUTC, LLMON, AUXVCC to GND ...............-0.3V to +14V
GATE to GND ..............................................-0.3V to (V
IN
+ 8.5V)
GATE to LLMON (Note 1).........................................-1V to +8.5V
INC, ON to GND (Note 2) .........................................-1V to +14V
CEXT to GND...............................................-8.5V to (V
IN
+ 0.3V)
CSPD, CTON,
REF to GND ...........-0.3V to the lower of (V
IN
+ 0.3V) or +12V
VSENSE, RTH, CTIM to GND.......................-0.3V to (V
IN
+ 0.3V)
Current into INC, ON (Note 2) ............................................±2mA
Current into Any Other Pin ...............................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
16-Pin SO (derate 8.7mW/°C above +70°C)................696mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
TYP
MAX
UNITS
POWER SUPPLIES
Input Voltage Range V
IN
2.7
13.2
V
Supply Current I
Q
V
ON
= V
IN
0.6 1 mA
CURRENT CONTROL
T
A
= +25°C 455055
Slow Comparator Threshold
V
SC
,
TH
V
IN
- V
SENSE
T
A
= T
MIN
to T
MAX
43.5
56
mV
C
SPD
= floating 10 20 40 μs
Slow Comparator Response
Time
t
CSPD
C
SPD
= 100nF to GND 10 20 40 ms
T
A
= +25°C 455055
5kΩ on
RTH to
V
IN
T
A
= T
MIN
to T
MAX
43.5
56
T
A
= +25°C 675 750 825
75kΩ
on RTH
to V
IN
T
A
= T
MIN
to T
MAX
650 840
MAX4273
only
RTH = GN D
Fast Comparator Threshold
V
FC
,
TH
MAX4271/MAX4272
180 200 220
mV
Fast Comparator Response
Time
t
FCD
10mV overdrive, from overload condition to
gate discharging
350 ns
SENSE Input Bias Current
I
B
,
SENSE
V
SENSE
= V
IN
0.2 10 μA
MOSFET DRIVER
MAX4271/MAX4272 C
TIM
= 100nF 21 31
41
MAX4273 C
TON
= 100nF 21 31 41
ms
Startup Period
(Notes 4, 5)
t
START
No capacitor 5.5 μs
Gate Charge Current I
GATE
GATE = IN (Note 6) 100 μA
MAX4271/MAX4272/MAX4273
3V to 12V Current-Limiting Hot-Swap Controllers
with Autoretry, 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 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Slow Turn-Off Time
t
SLOW
,
OFF
Time from trigger to V
GATE
< 0.1V
(triggered by either the ON input or the
slow comparator), C
GATE
= 1000pF to
GND
60 µs
Fast Turn-Off Time
t
FAST
,
OFF
Time from current overload to V
GATE
< 0.1V
(triggered by the fast comparator, during
normal operation), C
GATE
= 1000pF to GND
15 μs
Maximum Gate Protection
Voltage
Voltage at which internal zener clamp
circuitry is triggered, measured with
respect to V
IN
(MAX4271/MAX4272),
measured with respect to V
LLMON
(MAX4273)
6.7 7.5 V
V
IN
≥ 5V
5
Minimum Gate Drive Voltage
Measured with
respect to V
IN,
I
GATE
= 8.5µA
V
IN
≥ 2.7V 2.7
V
During fast discharge, due to a fast
comparator fault in normal operation
0.4 1
2.75
mA
During startup (current regulation provided
by fast comparator)
25 70 195
Gate Discharge Current
I
GATE
,
DIS
During normal discharge, due to a slow
comparator fault in normal mode, or by ON
going low
75 200 550
μA
LLMON Overvoltage Threshold
Startup is initiated only after V
LLMON
is less
than this voltage (MAX4273)
0.1 V
GATE Overvoltage Threshold
Startup is initiated only after V
GATE
is less
than this voltage
0.1 0.6 V
LLMON Impedance Im p ed ance to GN D , after a faul t ( M AX 4273) 1 kΩ
REFERENCE (MAX4273)
Output Voltage V
REF
No load, V
IN
= 5V
1.164
1.2
1.236
V
Line Regulation
Δ
V
REF
,
LINE
2.7V ≤ V
IN
≤ 13.2V, no load 1 8 mV
Load Regulation
ΔV
REF,
LOAD
I
REF
= 0 to 100μA, V
IN
= 5V 0.6 3 mV
ON AND RESET COMPARATORS
Threshold Voltage V
IN
= 5V, rising threshold at ON or INC
0.575
0.6
0.625
V
Hysteresis V
HYST
3mV
Power-Supply Rejection Ratio PSRR 2.7V ≤ V
IN
≤ 13.2V ±1
mV/V
10mV overdrive, ON going positive or
negative, INC going negative
10 μs
Propagation Delay
t
D
,
COMP
INC going positive 100 150 200 ms
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

MAX4272ESA+

Mfr. #:
Buy MAX4272ESA+
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers 3-12V Current-Limit Hot Swap Controller
Lifecycle:
New from this manufacturer.
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