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PDF MAX5911ESA Data sheet ( Hoja de datos )
| Número de pieza | MAX5911ESA | |
| Descripción | -48V Simple Swapper Hot-Swap Switches | |
| Fabricantes | Maxim Integrated | |
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19-1832; Rev 0a; 1/01
-48V Simple Swapper Hot-Swap Switches
General Description
The MAX5911/MAX5912 are fully integrated hot-swap
switches for negative supply rails. These devices allow
the safe insertion and removal of circuit cards into live
backplanes or ports without causing problematic glitch-
es on the negative 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
FAULT output. The MAX5911/MAX5912 operate over a
voltage range of -16V to -65V and are designed to permit
hot plugging of an IP phone into a hub, but are not limit-
ed to that operation.
During startup, an internal power FET regulates the cur-
rent between the backplane power source and the load
to 280mA for MAX5911 and 415mA for MAX5912. After
startup, the FET is fully enhanced to reduce its on-resis-
tance. To ensure robust operation, the MAX5911/
MAX5912 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.
ENABLE is also used to reset the device after a latching
fault condition occurs.
The MAX5911/MAX5912 Simple Swapper™ hot-swap
ICs monitor four parameters for these 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 MAX5911 and MAX5912
come in 8-pin and 16-pin SOIC packages, respectively.
Applications
IP Phones
Network Routers
Network Switches
Internet Appliances
Power-Over-LAN
Typical Operating Circuit
VIN (-48V)
+3.3V
VIN
0.1µF
VOUT
MAX5911
MAX5912
3.3kΩ
UVLO
POSITIVE
LOGIC
FAULT
ENABLE
DGND
AGND
AGND
DGND
LOAD
Features
o Provides Safe Hot Swap for -16V to -65V Power
Supplies
o 280mA Current Limit for MAX5911
o 415mA Current Limit for MAX5912
o Zero-Current Load Disconnect
o Integrated Power FET
o Status Output Reports Fault Condition
o Internal Switch-Protection Circuitry
o Built-In Thermal Shutdown
o DGND Can Vary Up to ±5V with Respect to AGND
Ordering Information
PART
MAX5911ESA
MAX5912ESE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
16 SO
Simple Swapper is a trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
GATE 1
VIN 2
FAULT 3
DGND 4
MAX5911
8 SO
8 UVLO
7 VOUT
6 AGND
5 ENABLE
N.C.* 1
N.C.* 2
GATE 3
VIN 4
VIN 5
FAULT 6
DGND 7
N.C.* 8
MAX5912
16 N.C.*
15 UVLO
14 VOUT
13 VIN
12 VIN
11 AGND
10 ENABLE
9 N.C.*
16 SO
*THESE PINS ARE NOT INTERNALLY CONNECTED.
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
-48V Simple Swapper Hot-Swap Switches
Typical Operating Characteristics (continued)
(VIN = -48V, AGND = DGND = 0, UVLO = open circuit, VENABLE = +3.3V, RLOAD = 1.8kΩ, TA = +25°C, unless otherwise noted.)
MAX5912 TURN-OFF WAVEFORMS
MAX5912
MAX5912
(RL = 1.8kΩ, CL = 47µF)
MAX5911 toc13
OVERCURRENT RESPONSE
MAX5911 toc14
ZERO-CURRENT RESPONSE
MAX5911 toc15
AA
A
00
0
00
BB
0
B
C
0
t = 100ms/div
A: ENABLE, 5V/div
C: FAULT, 2V/div
B: VOUT, 20V/div
0
C
t = 40ms/div
A: FAULT, 5V/div
B: VOUT, 20V/div
C: IOUT, 200mA/div
0
C
t = 40ms/div
A: FAULT, 5V/div
B: VOUT, 20V/div
C: IOUT, 100mA/div
PIN
MAX5911
MAX5912
13
2 4, 5, 12, 13
36
47
5 10
6 11
7 14
8 15
— 1, 2, 8, 9, 16
Pin Description
NAME
FUNCTION
GATE
VIN
FAULT
DGND
ENABLE
AGND
VOUT
UVLO
N.C.
Gate of the Internal Power MOSFET. Normally leave open circuit. To slow
down the output voltage ramp, connect two capacitors, one to VIN and one to
VOUT. See GATE Connections for details.
Voltage Input Terminal. Bypass VIN, to AGND with a 0.1µF capacitor to
improve noise immunity.
Fault Logic Output, open-drain. Tie FAULT to the positive logic supply with a
3.3kΩ resistor. Referenced to DGND.
Digital Ground. Ground reference level for the external positive logic, FAULT,
and ENABLE. DGND can vary up to ±5V with respect to AGND to
accommodate differential ground voltages in large systems.
ENABLE Input. Turns on and off the internal FET. ENABLE is a positive logic-
level input referenced to DGND. Drive ENABLE high to enable VOUT. Drive
ENABLE low to disable VOUT. Pulse ENABLE low to reset the MAX5911/
MAX5912 after a latched fault condition occurs.
Analog Ground. Ground reference level for VIN, VOUT, and UVLO.
Voltage Output Terminal
Undervoltage Lockout Input. Leave UVLO open circuit for default setting
of -28V. Alternatively, UVLO can be connected to a resistive divider to set the
lockout voltage (see the Changing the Undervoltage Lockout Setting section).
The comparator threshold level is +1.258V with respect to VIN.
No Connection. No internal connection.
_______________________________________________________________________________________ 5
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