MAX5949B Hot-Swap Controllers Datasheet

MAX5949B Datasheet, PDF, Equivalent


Part Number

MAX5949B

Description

-48V Hot-Swap Controllers

Manufacture

Maxim Integrated

Total Page 18 Pages
Datasheet
Download MAX5949B Datasheet


MAX5949B
19-3494; Rev 1; 8/11
-48V Hot-Swap Controllers
with External RSENSE
General Description
The MAX5949A/MAX5949B are hot-swap controllers that
allow a circuit card to be safely hot plugged into a live
backplane. The MAX5949A/MAX5949B operate from
-20V to -80V and are well-suited for -48V power systems.
These devices are pin and function compatible with the
LT4250 and pin compatible with the LT1640.
The MAX5949A/MAX5949B provide a controlled turn-on
to circuit cards preventing glitches on the power-supply
rail and damage to board connectors and components.
The MAX5949A/MAX5949B provide undervoltage, over-
voltage, and overcurrent protection. These devices
ensure the input voltage is stable and within tolerance
before applying power to the load.
Both the MAX5949A and MAX5949B protect a system
against overcurrent and short-circuit conditions by turn-
ing off the external MOSFET in the event of a fault con-
dition. The MAX5949A/MAX5949B also provide
protection against input voltage steps. During an input
voltage step, the MAX5949A/MAX5949B limit the cur-
rent drawn by the load to a safe level without turning off
power to the load.
Both devices feature an open-drain power-good status
output (PWRGD for the MAX5949A or PWRGD for the
MAX5949B) that can be used to enable downstream
converters.
The MAX5949A/MAX5949B are available in an 8-pin SO
package. Both devices are specified for the extended
-40°C to +85°C temperature range.
Applications
Telecom Line Cards
Network Switches/Routers
Central-Office Line Cards
Server Line Cards
Base-Station Line Cards
Central-Office Switching
-48V Distributed Power Systems
Negative Power-Supply Controls
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
Features
o Allow Safe Board Insertion and Removal
from a Live -48V Backplane
o Pin and Function Compatible with LT4250L
(MAX5949A)
o Pin Compatible with LT1640L (MAX5949A)
o Pin and Function Compatible with LT4250H
(MAX5949B)
o Pin Compatible with LT1640H (MAX5949B)
o Circuit-Breaker Immunity to Input Voltage Steps
and Current Spikes
o Withstand -100V Input Transients with No
External Components
o Programmable Inrush and Short-Circuit Current
Limits
o Operate from -20V to -80V
o Programmable Overvoltage Protection
o Programmable Undervoltage Lockout
o Power Up into a Shorted Load
o Power-Good Control Output
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5949AESA+
-40°C to +85°C
8 SO
MAX5949BESA+
-40°C to +85°C
8 SO
+Denotes a lead(Pb)-free/RoHS-compliant package.
TOP VIEW
Pin Configuration
PWRGD
+
(PWRGD) 1
OV 2
UV 3
MAX5949A
MAX5949B
VEE 4
8 VDD
7 DRAIN
6 GATE
5 SENSE
SO
( ) FOR MAX5949B.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

MAX5949B
-48V Hot-Swap Controllers
with External RSENSE
ABSOLUTE MAXIMUM RATINGS
(All voltages are referenced to VEE, unless otherwise noted.)
Supply Voltage (VDD - VEE ) .................................-0.3V to +100V
PWRGD, PWRGD .................................................-0.3V to +100V
DRAIN (Note 1)........................................................-2V to +100V
PWRGD to DRAIN .............................................… -0.3V to +95V
PWRGD to VDD........................................................-95V to +85V
SENSE (Internally Clamped) .................................-0.3V to +1.0V
GATE (Internally Clamped) ....................................-0.3V to +18V
UV and OV..............................................................-0.3V to +60V
Current Through SENSE ...................................................±40mA
Current into GATE...........................................................±300mA
Current into DRAIN .........................................-100mA to +20mA
Current into Any Other Pin................................................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: Test condition per Figure 1. DRAIN current must be limited to the specified 100mA maximum.
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
(VEE = 0V, VDD = 48V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Notes 2, 5)
PARAMETER
SYMBOL
POWER SUPPLIES
Operating Input Voltage Range
VDD
Supply Current
IDD
GATE DRIVE AND CLAMPING CIRCUITS
GATE Pin Pullup Current
IPU
GATE Pin Pulldown Current
IPD
External Gate Drive
GATE to VEE Clamp Voltage
VGATE
VGSCLMP
CIRCUIT BREAKER
Current-Limit Trip Voltage
SENSE Input Bias Current
VCL
ISENSE
UNDERVOLTAGE LOCKOUT
CONDITIONS
(Note 3)
Gate drive on, VGATE = VEE
Gate drive off, VGATE = 2V, TA = +25°C
VGATE - VEE, 20V VDD 80V
VGATE - VEE, IGS = 30mA
VCL = VSENSE - VEE
VSENSE = 50mV
MIN TYP MAX
20 80
0.7 2
-30 -45 -60
24 50 70
10 13.5 18
15 16.4 18
40 50 60
0 -0.2 -2
Internal Undervoltage-Lockout
Voltage High
VUVLOH VDD increasing
13.8 15.4 17.0
Internal Undervoltage-Lockout
Voltage Low
VUVLOL VDD decreasing
11.8 13.4 15.0
UV PIN
UV High Threshold
UV Low Threshold
UV Hysteresis
UV Input Bias Current
OV PIN
OV High Threshold
OV Low Threshold
OV Hysteresis
OV Input Bias Current
VUVH
VUVL
VUVHY
IINUV
UV voltage increasing
UV voltage decreasing
VUV = VEE
VOVH
VOVL
VOVHY
IINOV
OV voltage increasing
OV voltage decreasing
VOV = VEE
1.240
1.105
1.255
1.125
130
0
1.270
1.145
-0.5
1.235
1.210
1.255
1.235
20
0
1.275
1.255
-0.5
UNITS
V
mA
µA
mA
V
V
mV
µA
V
V
V
V
mV
µA
V
V
mV
µA
2 _______________________________________________________________________________________


Features 19-3494; Rev 1; 8/11 MAX5949A/MAX5949B -48V Hot-Swap Controllers with Externa l RSENSE General Description The MAX59 49A/MAX5949B are hot-swap controllers t hat allow a circuit card to be safely h ot plugged into a live backplane. The M AX5949A/MAX5949B operate from -20V to - 80V and are well-suited for -48V power systems. These devices are pin and func tion compatible with the LT4250 and pin compatible with the LT1640. The MAX594 9A/MAX5949B provide a controlled turn-o n to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MA X5949A/MAX5949B provide undervoltage, o vervoltage, and overcurrent protection. These devices ensure the input voltage is stable and within tolerance before applying power to the load. Both the MA X5949A and MAX5949B protect a system ag ainst overcurrent and short-circuit con ditions by turning off the external MOS FET in the event of a fault condition. The MAX5949A/MAX5949B also provide protection against input vol.
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