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부품번호 MAX5939FESA 기능
기능 -48V Hot-Swap Controllers with External RSENSE and High Gate Pulldown Current
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MAX5939FESA 데이터시트, 핀배열, 회로
19-2946; Rev 0; 9/03
-48V Hot-Swap Controllers with External
RSENSE and High Gate Pulldown Current
General Description
The MAX5921/MAX5939 hot-swap controllers allow a cir-
cuit card to be safely hot plugged into a live backplane.
The MAX5921/MAX5939 operate from -20V to -80V and
are well suited for -48V power systems. These devices
are pin compatible with both the LT1640 and LT4250 and
provide improved features over these devices.
The MAX5921/MAX5939 provide a controlled turn-on to
circuit cards preventing damage to board connectors,
board components, and preventing glitches on the
power-supply rail. The MAX5921/MAX5939 provide
undervoltage, overvoltage, and overcurrent protection.
These devices ensure that the input voltage is stable
and within tolerance before applying power to the load.
Both the MAX5921 and MAX5939 protect a system
against overcurrent and short-circuit conditions by turn-
ing off the external MOSFET in the event of a fault con-
dition. The MAX5921/MAX5939 protect against input
voltage steps by limiting the load current to a safe level
without turning off power to the load.
The device features an open-drain power-good status
output, PWRGD or PWRGD for enabling downstream
converters (see Selector Guide). A built-in thermal shut-
down feature is also included to protect the external
MOSFET in case of overheating. The MAX5939 features
a latched fault output. The MAX5921 contains built-in
autoretry circuitry after a fault condition.
The MAX5921/MAX5939 are available in an 8-pin SO
package and operate in the extended -40°C to +85°C
temperature range.
Applications
Telecom Line Cards
Network Switches/Routers
Central-Office Line Cards
Server Line Cards
Base-Station Line Cards
Features
o Allows Safe Board Insertion and Removal
from a Live -48V Backplane
o Pin-Compatible with LT1640 and LT4250
o Circuit Breaker Immunity to Input Voltage Steps
and Current Spikes
o 450mA GATE Pulldown Current During Short-
Circuit Condition
o Exponential GATE Pulldown Current
o Withstands -100V Input Transients with No
External Components
o Programmable Inrush and Short-Circuit Current
Limits
o Operates from -20V to -80V
o Programmable Overvoltage Protection
o Programmable Undervoltage Lockout
with Built-In Glitch Filter
o Overcurrent Fault Integrator
o Powers Up into a Shorted Load
o Power-Good Control Output
o Thermal Shutdown Protects External MOSFET
Ordering Information
PART
MAX5921AESA
MAX5921BESA
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 SO
Ordering Information continued at end of data sheet.
TOP VIEW
Pin Configuration
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
PWRGD
(PWRGD) 1
OV 2
UV 3
VEE 4
MAX5921
MAX5939
8 VDD
7 DRAIN
6 GATE
5 SENSE
SO
() FOR MAX5921B/F AND MAX5939B/F.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.




MAX5939FESA pdf, 반도체, 판매, 대치품
-48V Hot-Swap Controllers with External
RSENSE and High Gate Pulldown Current
(VDD = +48V, VEE = 0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
900
800
700
600
500
400
300
200
100
0
0
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TA = +85°C
TA = +25°C
TA = -40°C
20 40 60 80
SUPPLY VOLTAGE (V)
100
GATE PULLUP CURRENT
vs. TEMPERATURE
45.0
VGATE = 0V
44.8
44.6
44.4
44.2
44.0
43.8
43.6
43.4
43.2
43.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
GATE PULLDOWN CURRENT
vs. OVERDRIVE DURING A SHORT CIRCUIT
500
VGATE = 2V
400
300
200
100
0
600
750 900 1050
OVERDRIVE (mV)
1200
15
14
13
12
11
10
9
8
7
0
GATE VOLTAGE
vs. SUPPLY VOLTAGE
TA = +25°C
20 40 60 80
SUPPLY VOLTAGE (V)
100
GATE PULLDOWN CURRENT
vs. TEMPERATURE AFTER A FAULT
70
VGATE = 2V
65
60
55
50
45
40
35
30
25
-40
-15 10 35 60
TEMPERATURE (°C)
85
PWRGD OUTPUT LOW VOLTAGE
vs. TEMPERATURE (MAX5921A)
180
IOUT = 5mA
160
140
120
100
80
60
40
20
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
60
58
56
54
52
50
48
46
44
42
40
-40
CURRENT-LIMIT TRIP VOLTAGE
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
85
GATE PULLDOWN CURRENT
vs. OVERDRIVE DURING A CURRENT FAULT
90
VGATE = 2V
75
60
45
30
15
0
0 20 40 60 80 100
OVERDRIVE (mV)
PWRGD OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE (MAX5921B)
100
VDRAIN - VEE > 2.4V
10
1
0.1
0.01
0.001
-40
-15 10 35 60
TEMPERATURE (°C)
85
4 _______________________________________________________________________________________

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MAX5939FESA 전자부품, 판매, 대치품
-48V Hot-Swap Controllers with External
RSENSE and High Gate Pulldown Current
Timing Diagrams (continued)
DRAIN
1.4V
PWRGD
tPHLDL
VEE
1V
VEE
DRAIN
1.4V
PWRGD
VDCEN - VDRAIN = 0V
tPHLDL
1V
Figure 5a. DRAIN to PWRGD/PWRGD Timing
VEE
1.4V
VGATE - VGATE = 0V
GATE
tPHLGH
PWRGD
1V
VEE
1.4V
VGATE - VGATE = 0V
GATE
PWRGD
VDCEN - VDRAIN = 0V
tPHLGH
VEE
1V
Figure 5b. GATE to PWRGD/PWRGD Timing
Block Diagram
VDD
UV
REF
UVLO
VDD AND
REFERENCE
GENERATOR
VDD
REF
LOGIC
MAX5921/MAX5939
OUTPUT
DRIVER
PWRGD
PWRGD
OV
50mV
GATE
DRIVER
VEE SENSE
VDL
VEE
GATE DRAIN
VGH
VGATE
_______________________________________________________________________________________ 7

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MAX5939FESA

-48V Hot-Swap Controllers with External RSENSE and High Gate Pulldown Current

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