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MAX5912ESE+

P1-P3P4-P6P7-P8
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
Features
♦ Provides Safe Hot Swap for -16V to -65V Power
Supplies
♦ 280mA Current Limit for MAX5911
♦ 415mA Current Limit for MAX5912
♦ Zero-Current Load Disconnect
♦ Integrated Power FET
♦ Status Output Reports Fault Condition
♦ Internal Switch-Protection Circuitry
♦ Built-In Thermal Shutdown
♦ DGND Can Vary Up to ±5V with Respect to AGND
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap Switches
________________________________________________________________ Maxim Integrated Products 1
AGND
ENABLEDGND
1
2
8
7
UVLO
V
OUT
V
IN
FAULT
GATE
8 SO
TOP VIEW
3
4
6
5
MAX5911
V
OUT
V
IN
N.C.*
1
2
13
12
N.C.*
UVLO
N.C.*
16 SO
6
7
11
10
MAX5912
3
4
5
8
16
15
14
9
ENABLE
N.C.*
V
IN
AGND
V
IN
GATE
V
IN
N.C.*
DGND
FAULT
*THESE PINS ARE NOT INTERNALLY CONNECTED.
Pin Configurations
V
IN
FAULT
ENABLE
DGND
UVLO
AGND
POSITIVE
LOGIC
0.1µF
3.3kΩ
+3.3V
V
OUT
LOAD
V
IN
(-48V)
MAX5911
MAX5912
AGND
DGND
Typical Operating Circuit
19-1832; Rev 0a; 1/01
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.
Ordering Information
Simple Swapper is a trademark of Maxim Integrated Products, Inc.
PART TEMP. RANGE PIN-PACKAGE
MAX5911ESA -40°C to +85°C 8 SO
MAX5912ESE -40°C to +85°C 16 SO
IP Phones
Network Routers
Network Switches
Internet Appliances
Power-Over-LAN
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL SPECIFICATIONS
(V
IN
= -48V, AGND = DGND = 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.)
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.
V
IN
..........................................................................+0.3V to -70V
V
OUT
............................................................+0.3V to (V
IN
- 0.3V)
ENABLE to DGND ..................................................-0.3V to +11V
ENABLE to V
IN
.......................................................-0.3V to +70V
FAULT to DGND .....................................................-0.3V to +11V
UVLO to V
IN
............................................................-0.3V to +11V
DGND ..........................................................................-5V to +5V
DGND to V
IN
...........................................................-0.3V to +70V
FAULT Sink Current ............................................................10mA
Continuous Output Current ...............................Internally Limited
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
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V
IN
-65 -16 V
Supply Current I
IN
Measured at AGND at the end of output
voltage slew
1.5 2.5 mA
MAX5911 -310 -280 -250
Maximum V
OUT
Current I
OUT(MAX)
V
OUT
= V
IN
+ 5V
MAX5912 -457 -415 -373
mA
DMOS On-Resistance R
DS(ON)
MAX5911 I
OUT
= -225mA,
MAX5912 I
OUT
= -350mA
2.5 4 Ω
V
OUT
Leakage Current
Measured on V
OUT
when internal DMOS is
shut off
10 µA
ENABLE Low
Voltage V
IL
Referenced to DGND 0.8 V
ENABLE High Voltage V
IH
Referenced to DGND 2.0 V
ENABLE High Input Current I
IH
V
ENABLE
= +3.3V 140 300 µA
ENABLE Low Pulse Width
(Note 1)
t
EPW
200 ns
FAULT Output Low Voltage
V
OL
I
FAULT
= 3mA 0.4 V
FAULT Output Leakage Current I
OH
V
FAULT
= +3.3V 10 µA
Zero-Current Detection
Threshold
IF
TH
Decreasing load current -12 -8 -4 mA
Zero-Current Detection
Threshold Hysteresis
IF
HY
1.5 mA
Zero-Current Detection Delay
(Note 2)
IF
DEL
280 350 520 ms
Current-Limit Delay (Note 3) t
LIMIT
V
OUT
shorted to AGND 10 20 µs
Power-Good Threshold V
PG
|V
IN
- V
OUT
|, |V
IN
- V
OUT
| decreasing 1.95 2.15 2.35 V
Power-Good Hysteresis PG
HYS
% of V
PG
5%
Voltages are with respect to AGND, unless otherwise noted.
MAX5911/MAX5912
-48V Simple Swapper Hot-Swap Switches
_______________________________________________________________________________________ 3
0.8
1.0
1.4
1.2
1.6
1.8
-65 -45-55 -35 -25 -15
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX5911 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
NO LOAD
1.510
1.520
1.515
1.530
1.525
1.535
1.540
-40 10-15 356085
SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
MAX5911 toc02
TEMPERATURE (
°
C)
SUPPLY CURRENT (mA)
NO LOAD
1.6
2.0
1.8
2.4
2.2
2.8
2.6
3.0
-40 10-15 356085
ON-RESISTANCE
vs. AMBIENT TEMPERATURE
MAX5911 toc03
TEMPERATURE (
°
C)
ON-RESISTANCE (Ω)
I
LOAD
= 150mA
Typical Operating Characteristics
(V
IN
= -48V, AGND = DGND = 0, UVLO = open circuit, V
ENABLE
= +3.3V, R
LOAD
= 1.8kΩ, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL SPECIFICATIONS (continued)
(V
IN
= -48V, AGND = DGND = 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.)
Note 1: Minimum ENABLE low pulse width required to unlatch fault condition.
Note 2: The delay from I
OUT
falling below the zero-current threshold until FAULT is latched low and V
OUT
is disabled.
Note 3: The time from an output overcurrent or short-circuit condition until the output goes into current limit.
Note 4: The time from V
OUT
falling until FAULT is asserted low. FAULT is not latched for Power-Not-Good condition.
Note 5: When the device goes into thermal shutdown, the output is disabled and FAULT is latched low.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Not-Good Output Delay
(Note 4)
PG
DEL
After |V
IN
- V
OUT
| increases above
(V
PG
+ PG
HYS
)
81420ms
Thermal Shutdown Temperature
(Note 5)
T
J
140
o
C
Default UVLO UVLO open circuit, |V
IN
| increasing -30 -28 -26 V
UVLO Hysteresis
UVLO open circuit, percentage of UVLO
threshold
12 %
UVLO Comparator Threshold
Referenced to V
IN
, UVLO open circuit,
|V
IN
| increasing
+1.258 V
UVLO Input Resistance R
UVLO
95 kΩ
P1-P3P4-P6P7-P8

MAX5912ESE+

Mfr. #:
Buy MAX5912ESE+
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers 48V- Hot-Swap Controlle
Lifecycle:
New from this manufacturer.
Delivery:
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