MAX5917AESE+T [MAXIM]
Power Supply Support Circuit, Adjustable, 1 Channel, PDSO16, 0.150 INCH, SOIC-16;
| 型号： | MAX5917AESE+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Adjustable, 1 Channel, PDSO16, 0.150 INCH, SOIC-16 开关 |
| 文件： | 总11页 (文件大小：273K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1706; Rev 0; 7/01
+65V Simple Swapper Hot-Swap Switches
General Description
Features
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.
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
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.
o Integrated 2.2 Power FET
o Status Output Reports Fault Conditions
o Internal Switch-Protection Circuitry
o Built-In Thermal Shutdown
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.
Ordering Information
PART
TEMP. RANGE
-40 C to +85 C
-40 C to +85 C
-40 C to +85 C
PIN-PACKAGE
8 SO
MAX5910ESA
MAX5917AESE*
MAX5917BESE
16 SO
16 SO
Applications
IP Phones
*Future product—contact factory for availability.
Power-Over-LAN
Power-Over-MDI
Typical Operating Circuit
Remote Power Distribution
Network Routers
V
(+42V)
IN
Network Switches
V
IN
V
OUT
MAX5910
MAX5917
Internet Appliances
10k
10k
+3.3V
IFAULT
PGOOD
UVLO
L
O
A
D
ON
ENABLE
OFF
GND
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
ABSOLUTE MAXIMUM RATINGS
IN OUT
ENABLE to GND..................................................-0.3V to +12.0V
PGOOD, IFAULT to GND ....................................-0.3V to +12.0V
UVLO to GND ..............................................-0.3V to (V + 0.3V)
V
, V
to GND................................................-0.3V to +70.0V
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
IN
PGOOD, IFAULT Sink Current ............................................10mA
Continuous Power Dissipation (T = +70°C)
A
8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW
16-Pin SO (derate 12.9mW/°C above +70°C)............1039mW
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 = +42V, GND = 0, UVLO = open circuit, V
= +3.3V, and T = -40°C to +85°C, unless otherwise noted. Typical values are
A
IN
ENABLE
at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
65
UNITS
V
Input Voltage Range
Supply Current
V
10
IN
IN
I
V
= 10V to 65V (Note 1)
1.2
280
567
420
2.5
mA
IN
MAX5910
250
510
370
310
623
470
240
400
350
V
V
= V - 5V,
IN
= 10V to 65V
OUT
Output Current Limit
I
mA
mA
MAX5917A
MAX5917B
MAX5910
LIM
IN
Continuous Operating Output
Current
I
(Note 2)
MAX5917A
MAX5917B
OUT
V
= 10V to 65V,
IN
MAX5910, I
MAX5917A, I
MAX5917B, I
= 200mA
OUT
DMOS On-Resistance
R
2.2
4
DS(ON)
= 400mA
= 300mA
OUT
OUT
ENABLE Voltage Logic Low
ENABLE Voltage Logic High
ENABLE High Input Current
IFAULT Output Leakage Current
V
0.8
V
V
A
A
LOW
V
2.4
HIGH
I
V
= +5V
ENABLE
1
1
IH
I
IFAULT = 10V, I
> (IF + IF
)
OH
OH
TH
HYS
PGOOD Output Leakage
Current
IL
PGOOD = 10V, V
> V
1
1
A
A
PGOOD
OUT
PG
V
to V
Leakage Current
IL
IN/OUT
ENABLE = 0, V = +65V
IN
IN
OUT
PGOOD/IFAULT Output Logic
Low
V
V
Sink current = 3mA
0.4
85
V
OL
PGOOD Threshold
PGOOD Hysteresis
Percentage of V , V
rising
71
78
10
%
%
PG
IN OUT
PG
Percentage of V
IN
HYS
TH
MAX5910
2
2
2
12
6
12
25
10
25
Zero-Current Detection
Threshold
Decreasing output
current
IF
mA
MAX5917A
MAX5917B
2
_______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
ELECTRICAL CHARACTERISTICS (continued)
(V = +42V, GND = 0, UVLO = open circuit, V
= +3.3V, and T = -40°C to +85°C, unless otherwise noted. Typical values are
A
IN
ENABLE
at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
Percentage of IF
MIN
TYP
MAX
UNITS
Zero-Current Detection
Threshold Hysteresis
IF
10
%
HYS
TH
IFAULT Output Delay
t
(Figure 1)
(Figure 2)
Die temperature increasing
7
7
12
12
17
17
ms
ms
oC
oC
V
IFD
PGOOD Output Delay
t
PGD
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Default Undervoltage Lockout
T
J
140
3.5
26.5
T
JHYS
UVLO
V
V
decreasing
24.5
28.5
8
IN
Undervoltage Lockout
Hysteresis
UVLO
Percentage of V
11
%
V
HYS
UVLO
Minimum Undervoltage Lockout
Threshold
V
UVLO connected to V ,
IN
UVLO
7
7.5
V
decreasing
(MIN)
IN
Undervoltage Lockout Input
Resistance
R
Force I = 5 A into UVLO pin
260
k
UVLO
Note 1: Measured at GND pin at the end of the output voltage slew.
Note 2: Guaranteed by R test. Limited by package power dissipation.
DSON
I
OUT
V
PG
IF
TH
V
IN
t
PGD
t
IFD
3.3V
0
IFAULT
3.3V
0
PGOOD
Figure 1. IFAULT Delay
Figure 2. Power-Good Delay
_______________________________________________________________________________________
3
+65V Simple Swapper Hot-Swap Switches
Typical Operating Characteristics
(V = +42V, GND = 0, UVLO = open circuit, V
IN
= 3.3V, R = 1.8k , T = +25°C, unless otherwise noted).
L A
ENABLE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. TEMPERATURE
ON-RESISTANCE vs. TEMPERATURE
2.0
2.0
1.6
1.2
0.8
0.4
3.0
2.6
2.2
1.8
1.4
1.0
1.6
1.2
0.8
0.4
NO LOAD
I
= 150mA
35
NO LOAD
LOAD
0
0
10
20
30
40
50
60
-40
-15
10
35
60
85
-40
-15
10
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE ( C)
TEMPERATURE ( C)
MAX5910 TURN-ON WAVEFORMS
(R = 1.8k , C = 0)
MAX5910 TURN-OFF WAVEFORMS
(R = 1.8k , C = 0)
MAX5910 TURN-ON WAVEFORMS
(R = 1.8k , C = 47 F)
L
L
L
L
L
L
MAX5910 toc04
MAX5910 toc05
MAX5910 toc06
A
0
A
0
A
0
B
B
B
0
0
C
0
0
C
0
C
0
2ms/div
2ms/div
2ms/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
B: V , 20V/div
B: V , 20V/div
B: V , 20V/div
4
_______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
Typical Operating Characteristics (continued)
(V = +42V, GND = 0, UVLO = open circuit, V
IN
= 3.3V, R = 1.8k , T = +25°C, unless otherwise noted).
L A
ENABLE
MAX5910 TURN-OFF WAVEFORMS
(R = 1.8k , C = 47 F)
MAX5910 ZERO-CURRENT RESPONSE
MAX5910 OVER-CURRENT RESPONSE
L
L
MAX5910 toc07
MAX5910 toc08
MAX5910 toc09
A
0
A
0
A
0
B
0
B
0
B
0
C
C
0
C
0
0
20ms/div
2ms/div
40ms/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
A: I , 100mA/div
OUT
A: I , 200mA/div
OUT
B: V , 20V/div
B: IFAULT, 5V/div
B: IFAULT, 5V/div
C: V , 20V/div
C: V , 20V/div (SHORTED TO GND)
OUT
OUT
MAX5917B TURN-ON WAVEFORMS
(R = 1.8k , C = 0)
MAX5917B TURN-OFF WAVEFORMS
(R = 1.8k , C = 0)
MAX5917B TURN-ON WAVEFORMS
(R = 1 , C = 47 F)
L
L
L
L
L
L
MAX5910 toc10
MAX5910 toc11
MAX5910 toc12
A
A
A
0
0
0
B
0
B
0
B
0
C
0
C
0
C
0
2ms/div
2ms/div
2ms/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
B: V , 20V/div
B: V , 20V/div
B: V , 20V/div
_______________________________________________________________________________________
5
+65V Simple Swapper Hot-Swap Switches
Typical Operating Characteristics (continued)
(V = +42V, GND = 0, UVLO = open circuit, V
IN
= 3.3V, R = 1.8k , T = +25°C, unless otherwise noted).
L A
ENABLE
MAX5917B TURN-OFF WAVEFORMS
(R = 1.8k , C = 47 F)
MAX5917B TURN-OFF WAVEFORMS
(R = 300 , C = 500 F)
MAX5917B TURN-ON WAVEFORMS
(R = 300 , C = 500 F)
L
L
L
L
L
L
MAX5910 toc13
MAX5910 toc15
MAX5910 toc14
A
0
A
0
A
0
B
B
0
B
0
0
C
0
C
0
C
0
20ms/div
100ms/div
10ms/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
A: ENABLE, 5V/div
OUT
C: PGOOD, 5V/div
B: V , 20V/div
B: V , 20V/div
B: V , 20V/div
MAX5917B ZERO-CURRENT RESPONSE
MAX5917B OVER-CURRENT RESPONSE
MAX5910 I
vs. TEMPERATURE
OUT
MAX5910 toc16
MAX5910 toc17
300
290
280
270
260
250
A
0
A
0
B
0
B
0
C
C
0
0
2ms/div
40ms/div
-40
-15
10
35
60
85
A: I , 100mA/div
OUT
A: I , 200mA/div
OUT
TEMPERATURE ( C)
B: IFAULT, 5V/div
B: IFAULT, 5V/div
C: V , 20V/div
OUT
C: V , 20V/div (SHORTED TO GND)
OUT
6
_______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
Typical Operating Characteristics (continued)
(V = +42V, GND = 0, UVLO = open circuit, V
= 3.3V, R = 1.8k , T = +25°C, unless otherwise noted).
IN
ENABLE
L
A
MAX5910 I
vs. (V - V
)
OUT
MAX5917A I
vs. TEMPERATURE
OUT
IN
MAX5917B I
vs. TEMPERATURE
OUT
OUT
350
300
250
200
150
100
50
600
590
580
570
560
550
540
450
430
410
390
370
350
0
530
-40
0
0.4
0.8
1.2
(V)
1.6
2.0
-15
10
35
60
85
-40
-15
10
35
60
85
V
IN
- V
OUT
TEMPERATURE ( C)
TEMPERATURE ( C)
MAX5917A I
vs. (V - V
OUT
)
MAX5917B I
vs. (V - V
)
OUT
OUT
IN
OUT
IN
600
500
400
300
200
100
0
500
400
300
200
100
0
0
0.4
0.8
1.2
(V)
1.6
2.0
0
0.4
0.8
1.2
(V)
1.6
2.0
V
IN
- V
OUT
V
IN
- V
OUT
_______________________________________________________________________________________
7
+65V Simple Swapper Hot-Swap Switches
Pin Description
PIN
MAX5917A/B
NAME
FUNCTION
MAX5910
Undervoltage Lockout Input. Leave UVLO open circuit for the default
setting of 26.5V. Alternatively, UVLO can be connected to a resistive-
divider to set a desired lockout voltage. See the Changing the
Undervoltage Lockout Setting section.
1
2
UVLO
Voltage Input Terminal. Bypass V to GND with a 0.1µF capacitor to
IN
improve noise immunity.
2
3
3
V
IN
1, 6, 8, 9, 15, 16
N.C.
No Connection. Not internally connected.
3.3V Logic Input (TTL compatible), Active-High. Turns the internal FET
on or off. Drive ENABLE high to enable V
. Drive ENABLE low to
4
5
6
7
ENABLE
OUT
disable V
.
OUT
Open-Drain Logic Output, Active-High. PGOOD signals that the output
is within specification. When the output is less than 70% of the input, the
PGOOD signal is pulled low. Connect a 10k pullup resistor (R) to 3.3V.
10
11
PGOOD
Open-Drain Logic Output, Active-Low. IFAULT is asserted when the
output current falls below the IF nominal threshold or when the switch
TH
IFAULT
is off. Connect a 10k pullup resistor (R) to 3.3V.
7
8
4, 5, 12, 13
14
GND
Ground
V
Voltage Output Terminal
OUT
Detailed Description
Normal Operation
The MAX5910/MAX5917 are fully integrated hot-swap
switches for positive power-supply rails. The devices
allow safe insertion and removal of circuit cards into
live backplanes or ports without causing glitches on the
backplane power-supply rail. During startup these
devices act as current regulators using their on-board
FET to limit the amount of current drawn by the load to
280mA for MAX5910, 567mA for MAX5917A, and
420mA for MAX5917B. If the required load current
exceeds that current limit, the internal switch behaves
like a constant current source.
Startup
When power is first applied with ENABLE high, or when
ENABLE is asserted, the MAX5910/MAX5917A/
MAX5917B limit the current to the load to 280mA/
567mA/420mA. PGOOD is asserted high 12ms after the
output voltage exceeds the power-good threshold.
PGOOD is pulled low if V
is less than 70% V .
IN
OUT
Zero-Current Load Fault
A zero-current load detection feature activates if the
load current drops below IF for more than 12ms. The
TH
MAX5910/MAX5917 flag the zero-current condition but
The MAX5910/MAX5917 monitor the input voltage, the
output voltage, the output current, and the die tempera-
ture. They assert IFAULT and PGOOD accordingly if
they detect an error condition.
do not disconnect the load. IFAULT is deasserted
whenever the load current exceeds the IF
zero-current detection threshold.
+ IF
HYS
TH
A zero-current load detection feature activates if the
Undervoltage Lockout Fault
load current drops below IF
for over 12ms. The
TH
If V
UVLO, where UVLO is the desired voltage at
IN
MAX5910/MAX5917 also include an ENABLE input
allowing the host system to turn the FET on or off.
which the UVLO fault occurs, the internal FET is turned
off and IFAULT and PGOOD are pulled low. The default
UVLO voltage is 26.5V, but it can be adjusted using an
external resistive-divider (see the Changing the
Undervoltage Lockout Setting section).
8
_______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
Thermal Shutdown Fault
The MAX5910/MAX5917 monitor their internal die tem-
perature. If the temperature of the die exceeds +140°C,
the internal FET is turned off and IFAULT and PGOOD
are pulled low. The output is enabled again only when
the die temperature is below the thermal shutdown tem-
perature by 3.5°C typically.
V
OUT
V
IN
V
IN
V
OUT
MAX5910
UVLO
IFAULT
PGOOD
GND
R
ENABLE
N.C.
Power-Good (PGOOD)
Power-good (PGOOD) logic output signals when the
output has exceeded the PGOOD threshold. When the
output voltage is below 70% of the input voltage,
PGOOD is pulled low. When the output voltage is larger
than 80% of the input voltage for more than 12ms,
PGOOD is asserted.
R
+3.3V
Figure 3. UVLO is Set Internally to its +26.5V Default Value
Applications Information
Choosing a Device
The MAX5910 can output 280mA, the MAX5917B can
output 420mA, and the MAX5917A can output up to
567mA. In applications where high power is expected,
use the MAX5917 for its superior heat dissipation prop-
erties, and always solder all of its GND pins to a large
section of circuit board copper.
V
OUT
V
IN
V
IN
V
OUT
MAX5910
0.1 F
UVLO
IFAULT
10k
Logic Control
The enable input (ENABLE) responds to 3.3V logic sig-
nals and will force the internal FET off if ENABLE is
pulled low. This feature allows the host to disconnect
the load from the power bus if required. Drive ENABLE
ENABLE
N.C.
PGOOD
GND
10k
high to enable V
.
OUT
+3.3V
Changing the Undervoltage Lockout
Setting
Figure 4. Minimum +7.5V UVLO Configuration
The undervoltage lockout (UVLO) value defaults to
26.5V if the UVLO pin is left open circuit (Figure 3).
Connect UVLO to V to set the undervoltage lockout to
IN
a minimum of 7.5V (Figure 4). This lockout voltage can
also be changed with a resistive-divider from V to
IN
GND. The center node of the divider is connected to
the UVLO pin (Figure 5). The values of R1 and R2 must
satisfy the condition R1//R2 << 260k and R2 <<
1.65M . R2 can be calculated as follows:
V
OUT
V
IN
V
IN
V
OUT
MAX5910
0.1 F
R2
R1
UVLO
IFAULT
PGOOD
GND
R2 = R1 ✕ [(V
/ 7.5V) - 1]
UVLO
10k
ENABLE
N.C.
where V
is the desired lockout voltage.
IN (UVLO)
10k
+3.3V
Figure 5. Adjusting UVLO with an External Resistive-Divider
_______________________________________________________________________________________
9
+65V Simple Swapper Hot-Swap Switches
Functional Diagram
V
+ 8V
IN
CHARGE
PUMP
R
SENSE
IN
OUT
OSC.
I
REG
R
R
PG1
PG2
VREF
ON/OFF
PG
BANDGAP
REFERENCE
R
UV1
THERMAL
SHUTDOWN
VIN
1.236V
GND
UVLO
R
R
UV2
IFAULT
PGOOD
CONTROL
LOGIC
GND
UV3
GND
UVLO
ENABLE
Pin Configurations
TOP VIEW
N.C.
1
16 N.C.
15 N.C.
14
UVLO
1
8
7
6
5
V
OUT
UVLO
2
3
4
5
6
7
8
V
IN
2
GND
MAX5910
V
IN
V
OUT
N.C.
3
4
IFAULT
PGOOD
GND
GND
N.C.
MAX5917A/B
13 GND
ENABLE
12 GND
11 IFAULT
10 PGOOD
8 SO
ENABLE
N.C.
9
N.C.
16 SO
10 ______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
Chip Information
TRANSISTOR COUNT: 1003
PROCESS: SG3ISO
Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
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 ____________________ 11
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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