19-1706; Rev 0; 7/01
+65V Simple Swapper Hot-Swap Switches
General Description
The MAX5910/MAX5917 are fully integrated hot-swap
switches for positive supply rails. These devices allow
the safe insertion and removal of circuit cards into live
backplanes or ports without causing glitches on the
backplane power-supply rail. They also monitor various
circuit parameters and disconnect the load if a fault
condition occurs, alerting the host with a logic-level
IFAULT
output. The MAX5910/MAX5917 operate over a
+10V to +65V input voltage range. They are designed
to permit hot plugging of an internet appliance such as
an IP phone but are not limited to that application.
During startup, an internal power FET regulates the cur-
rent between the backplane power source and the load
to 280mA for the MAX5910, 567mA for the MAX5917A,
and 420mA for the MAX5917B. After startup, the FET is
fully enhanced to reduce its on-resistance. To ensure
robust operation, the MAX5910/MAX5917 contain built-
in safety features that prevent damage to the internal
FET. They include an enable input, which responds to
positive logic signals (+3.3V or +5V), allowing the host
system to disconnect the load.
The MAX5910/MAX5917 Simple Swapper™ hot-swap ICs
monitor four parameters for fault conditions: undervoltage
lockout (UVLO), power-not-good, zero-current detection,
and thermal shutdown. These devices are available in the
extended temperature range, -40°C to +85°C. The
MAX5910 comes in an 8-pin SO package and the
MAX5917A/B is available in a 16-pin SO package.
Features
o
Provides Safe Hot Swap for +10V to +65V Power
Supplies
o
IEEE 802.3af Compliant (MAX5917A)
o
Startup into 500µF Load (MAX5917A)
o
280mA Current Limit for MAX5910
o
567mA Current Limit for MAX5917A
o
420mA Current Limit for MAX5917B
o
Zero-Current Load Detection
o
Integrated 2.2Ω Power FET
o
Status Output Reports Fault Conditions
o
Internal Switch-Protection Circuitry
o
Built-In Thermal Shutdown
MAX5910/MAX5917
Ordering Information
PART
MAX5910ESA
MAX5917AESE*
MAX5917BESE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
16 SO
16 SO
Applications
IP Phones
Power-Over-LAN
Power-Over-MDI
Remote Power Distribution
Network Routers
Network Switches
Internet Appliances
*Future product—contact factory for availability.
Typical Operating Circuit
V
IN
(+42V)
V
IN
MAX5910
MAX5917
V
OUT
10kΩ
IFAULT
PGOOD
ENABLE
OFF
GND
L
O
A
D
+3.3V
UVLO
ON
10kΩ
Pin Configurations appear at end of data sheet.
Simple Swapper is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
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.
+65V Simple Swapper Hot-Swap Switches
MAX5910/MAX5917
ABSOLUTE MAXIMUM RATINGS
V
IN
, V
OUT
to GND................................................-0.3V to +70.0V
ENABLE to GND..................................................-0.3V to +12.0V
PGOOD, IFAULT to GND ....................................-0.3V to +12.0V
UVLO to GND ..............................................-0.3V to (V
IN
+ 0.3V)
PGOOD, IFAULT Sink Current ............................................10mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW
16-Pin SO (derate 12.9mW/°C above +70°C)............1039mW
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering 10s) ..................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
IN
= +42V, GND = 0, UVLO = open circuit, V
ENABLE
= +3.3V, and T
A
= -40°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Supply Current
Output Current Limit
SYMBOL
V
IN
I
IN
I
LIM
V
IN
= 10V to 65V (Note 1)
MAX5910
V
OUT
= V
IN
- 5V,
V
IN
= 10V to 65V
MAX5917A
MAX5917B
MAX5910
Continuous Operating Output
Current
I
OUT
(Note 2)
MAX5917A
MAX5917B
V
IN
= 10V to 65V,
MAX5910, I
OUT
= 200mA
MAX5917A, I
OUT
= 400mA
MAX5917B, I
OUT
= 300mA
250
510
370
CONDITIONS
MIN
10
1.2
280
567
420
TYP
MAX
65
2.5
310
623
470
240
400
350
mA
mA
UNITS
V
mA
DMOS On-Resistance
R
DS(ON)
2.2
4
Ω
ENABLE Voltage Logic Low
ENABLE Voltage Logic High
ENABLE High Input Current
IFAULT Output Leakage Current
PGOOD Output Leakage
Current
V
IN
to V
OUT
Leakage Current
PGOOD/IFAULT Output Logic
Low
PGOOD Threshold
PGOOD Hysteresis
Zero-Current Detection
Threshold
V
LOW
V
HIGH
I
IH
I
OH
IL
PGOOD
IL
IN/OUT
V
OL
V
PG
PG
HYS
IF
TH
V
ENABLE
= +5V
IFAULT
= 10V, I
OH
> (IF
TH
+ IF
HYS
)
PGOOD = 10V, V
OUT
> V
PG
ENABLE = 0, V
IN
= +65V
Sink current = 3mA
Percentage of V
IN
, V
OUT
rising
Percentage of V
IN
Decreasing output
current
MAX5910
MAX5917A
MAX5917B
2
2
2
71
78
10
12
6
12
2.4
0.8
1
1
1
1
0.4
85
25
10
25
V
V
µA
µA
µA
µA
V
%
%
mA
2
_______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +42V, GND = 0, UVLO = open circuit, V
ENABLE
= +3.3V, and T
A
= -40°C to +85°C, unless otherwise noted. Typical values are
at T
A
= +25°C.)
PARAMETER
Zero-Current Detection
Threshold Hysteresis
IFAULT
Output Delay
PGOOD Output Delay
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Default Undervoltage Lockout
Undervoltage Lockout
Hysteresis
Minimum Undervoltage Lockout
Threshold
Undervoltage Lockout Input
Resistance
SYMBOL
IF
HYS
t
IFD
t
PGD
T
J
T
JHYS
V
UVLO
UVLO
HYS
V
UVLO
(MIN)
MAX5910/MAX5917
CONDITIONS
Percentage of IF
TH
(Figure 1)
(Figure 2)
Die temperature increasing
V
IN
decreasing
Percentage of V
UVLO
UVLO connected to V
IN
,
V
IN
decreasing
Force I = 5µA into UVLO pin
MIN
TYP
10
MAX
UNITS
%
7
7
12
12
140
3.5
17
17
ms
ms
o
o
C
C
24.5
26.5
11
28.5
V
%
7
260
7.5
8
V
kΩ
R
UVLO
Note 1:
Measured at GND pin at the end of the output voltage slew.
Note 2:
Guaranteed by R
DSON
test. Limited by package power dissipation.
I
OUT
V
PG
IF
TH
t
IFD
IFAULT
3.3V
V
IN
t
PGD
3.3V
0
PGOOD
0
Figure 1.
IFAULT
Delay
Figure 2. Power-Good Delay
_______________________________________________________________________________________
3
+65V Simple Swapper Hot-Swap Switches
MAX5910/MAX5917
Typical Operating Characteristics
(V
IN
= +42V, GND = 0, UVLO = open circuit, V
ENABLE
= 3.3V, R
L
= 1.8kΩ, T
A
= +25°C, unless otherwise noted).
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5910 toc01
SUPPLY CURRENT
vs. TEMPERATURE
MAX5910 toc02
ON-RESISTANCE vs. TEMPERATURE
MAX5910 toc03
2.0
2.0
3.0
1.6
SUPPLY CURRENT (mA)
1.6
SUPPLY CURRENT (mA)
2.6
ON-RESISTANCE
(Ω)
1.2
1.2
2.2
0.8
0.8
1.8
0.4
NO LOAD
0
10
20
30
40
50
60
SUPPLY VOLTAGE (V)
0.4
NO LOAD
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
1.4
I
LOAD
= 150mA
1.0
-40
-15
10
35
60
85
TEMPERATURE (°C)
MAX5910 TURN-ON WAVEFORMS
(R
L
= 1.8kΩ, C
L
= 0)
A
0
MAX5910 toc04
MAX5910 TURN-OFF WAVEFORMS
(R
L
= 1.8kΩ, C
L
= 0)
MAX5910 toc05
MAX5910 TURN-ON WAVEFORMS
(R
L
= 1.8kΩ, C
L
= 47µF)
MAX5910 toc06
A
0
A
0
B
B
B
0
0
C
0
0
C
0
C
0
2ms/div
A: ENABLE, 5V/div
B: V
OUT
, 20V/div
C: PGOOD, 5V/div
A: ENABLE, 5V/div
B: V
OUT
, 20V/div
C: PGOOD, 5V/div
2ms/div
A: ENABLE, 5V/div
B: V
OUT
, 20V/div
C: PGOOD, 5V/div
2ms/div
4
_______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
MAX5910/MAX5917
Typical Operating Characteristics (continued)
(V
IN
= +42V, GND = 0, UVLO = open circuit, V
ENABLE
= 3.3V, R
L
= 1.8kΩ, T
A
= +25°C, unless otherwise noted).
MAX5910 TURN-OFF WAVEFORMS
(R
L
= 1.8kΩ, C
L
= 47µF)
MAX5910 ZERO-CURRENT RESPONSE
MAX5910 toc08
MAX5910 OVER-CURRENT RESPONSE
MAX5910 toc09
MAX5910 toc07
A
A
0
A
0
B
B
0
C
0
C
0
0
B
0
0
20ms/div
A: ENABLE, 5V/div
B: V
OUT
, 20V/div
C: PGOOD, 5V/div
A: I
OUT
, 100mA/div
B: IFAULT, 5V/div
C: V
OUT
, 20V/div
2ms/div
C
0
40ms/div
A: I
OUT
, 200mA/div
B: IFAULT, 5V/div
C: V
OUT
, 20V/div (SHORTED TO GND)
MAX5917B TURN-ON WAVEFORMS
(R
L
= 1.8kΩ, C
L
= 0)
A
0
MAX5910 toc10
MAX5917B TURN-OFF WAVEFORMS
(R
L
= 1.8kΩ, C
L
= 0)
MAX5910 toc11
MAX5917B TURN-ON WAVEFORMS
(R
L
= 1Ω, C
L
= 47µF)
A
0
MAX5910 toc12
A
0
B
0
B
0
C
0
2ms/div
A: ENABLE, 5V/div
B: V
OUT
, 20V/div
C: PGOOD, 5V/div
A: ENABLE, 5V/div
B: V
OUT
, 20V/div
C: PGOOD, 5V/div
B
0
C
0
C
0
2ms/div
A: ENABLE, 5V/div
B: V
OUT
, 20V/div
C: PGOOD, 5V/div
2ms/div
_______________________________________________________________________________________
5
京公网安备 11010802033920号
EEWORLD
