MAX5911 MAXIM [Maxim Integrated Products], MAX5911 Datasheet

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MAX5911

Manufacturer Part Number
MAX5911
Description
-48V Simple Swapper Hot-Swap Switches
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
MAX5911ESA
Manufacturer:
MAXIM
Quantity:
365
Part Number:
MAX5911ESA
Manufacturer:
MAXIM/美信
Quantity:
20 000
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.
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.
19-1832; Rev 0a; 1/01
IP Phones
Network Routers
Network Switches
AGND
POSITIVE
+3.3V
LOGIC
V
IN
(-48V)
-48V Simple Swapper Hot-Swap Switches
Typical Operating Circuit
DGND
________________________________________________________________ Maxim Integrated Products
3.3kΩ
0.1µF
General Description
V
UVLO
FAULT
ENABLE
DGND
AGND
IN
MAX5911
MAX5912
Internet Appliances
Power-Over-LAN
Applications
V
OUT
LOAD
o Provides Safe Hot Swap for -16V to -65V Power
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
Simple Swapper is a trademark of Maxim Integrated Products, Inc.
Supplies
MAX5911ESA
MAX5912ESE
PART
TOP VIEW
*THESE PINS ARE NOT INTERNALLY CONNECTED.
FAULT
FAULT
DGND
DGND
GATE
N.C.*
N.C.*
GATE
N.C.*
V
V
V
IN
IN
IN
1
2
4
1
2
3
4
5
6
7
8
3
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
Ordering Information
MAX5911
MAX5912
16 SO
Pin Configurations
8 SO
16
15
14
13
12
11
10
6
8
7
5
9
UVLO
V
AGND
ENABLE
N.C.*
UVLO
V
V
V
AGND
ENABLE
N.C.*
OUT
OUT
IN
IN
PIN-PACKAGE
8 SO
16 SO
Features
1

Related parts for MAX5911

MAX5911 Summary of contents

Page 1

... 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 ...

Page 2

... Lead Temperature (soldering, 10s) .................................+300°C = +3.3V, and T ENABLE A CONDITIONS IN Measured at AGND at the end of output I IN voltage slew MAX5911 OUT IN MAX5912 MAX5911 I = -225mA, OUT MAX5912 I = -350mA OUT Measured on V when internal DMOS is OUT shut off Referenced to DGND IL Referenced to DGND +3.3V ...

Page 3

Simple Swapper Hot-Swap Switches ELECTRICAL SPECIFICATIONS (continued -48V, AGND = DGND = 0, UVLO = open circuit values are +25°C.) A PARAMETER SYMBOL Power-Not-Good Output Delay PG (Note 4) Thermal Shutdown Temperature ...

Page 4

... C = 47µ MAX5911 toc11 1ms/div A: ENABLE, 5V/div C: FAULT, 2V/div 20V/div OUT = +25°C, unless otherwise noted.) A MAX5911 TURN-OFF WAVEFORMS (R = 1.8kΩ NONE 10µs/div A: ENABLE, 5V/div C: FAULT, 2V/div 20V/div OUT MAX5911 ...

Page 5

... A MAX5912 ZERO-CURRENT RESPONSE 40ms/div A: FAULT, 5V/div 100mA/div OUT 20V/div OUT Pin Description FUNCTION AGND with a 0.1µF capacitor to IN OUT . Pulse ENABLE low to reset the MAX5911 and UVLO. IN OUT . IN MAX5911 toc15 and one to . Drive 5 ...

Page 6

... FAULT is pulled low and the FET is latched off. ENABLE must be pulsed low and then brought high again to release FAULT and enable V Applications Information The MAX5911 will output up to 280mA (typ) and the MAX5912 up to 415mA (typ). In applications where high heat is expected, use the MAX5912 for its superior Normal Operation ...

Page 7

... The FAULT output is open-drain and is pulled low if the V OUT MAX5911/MAX5912 detect an undervoltage fault, a thermal fault, a power-not-good fault zero-current fault. See the Normal Operation section for specific details of fault operation. Connect FAULT to the logic supply with a pullup resistor; 3.3kΩ is sufficient in most cases ...

Page 8

Simple Swapper Hot-Swap Switches 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 ...

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