MAX5918 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – Low-Voltage, Dual Hot-Swap Controllers with Independent ON/OFF Control

19-2496; Rev 0; 7/02
EVAALVUAAILTAIOBNLEKIT
Low-Voltage, Dual Hot-Swap
Controllers with Independent ON/OFF Control
General Description
The MAX5918 and MAX5919 are +1V to +13.2V dual
hot-swap controllers with independent on/off control for
complete protection of dual-supply systems. They allow
the safe insertion and removal of circuit cards into live
backplanes. The MAX5918 and MAX5919 operate
down to 1V provided one of the inputs is above 2.7V
The discharged filter capacitors of the circuit card pro-
vide low impedance to the live backplane. High inrush
currents from the backplane to the circuit card can burn
up connectors and components, or momentarily collapse
the backplane power supply leading to a system reset.
The MAX5918 and MAX5919 hot-swap controllers pre-
vent such problems by gradually ramping up the output
voltage and regulating the current to a preset limit when
the board is plugged in, allowing the system to stabilize
safely. After the startup cycle is completed, two on-chip
comparators provide VariableSpeed/BiLevel™ protection
against short-circuit and overcurrent faults, as well as
immunity against system noise and load transients. In the
event of a fault condition, the load is disconnected. The
MAX5918L and MAX5919L must be unlatched after a
fault and the MAX5918A and MAX5919A automatically
restart after a fault.
The MAX5918 and MAX5919 integrate an on-board
charge pump to drive the gates of low-cost, external N-
channel MOSFETs. The devices offer integrated fea-
tures like startup current regulation and current glitch
protection to eliminate external timing resistors and
capacitors. These devices provide open-drain status
outputs, an adjustable startup timer and adjustable cur-
rent limits. The MAX5918 provides output undervolt-
age/overvoltage protection for each channel, while the
MAX5919 provides undervoltage/overvoltage monitor-
ing for each channel.
The MAX5918 and MAX5919 are available in a space-
saving 16-pin QSOP package and are specified over
the extended -40°C to +85°C temperature range.
Applications
Base Station Line Cards
Network Switches,
Routers, Hubs
Solid-State Circuit
Breakers
RAID
Power-Supply Sequencing
Hot Plug-In Daughter
Cards
Portable Computer Device
Bays (Docking Stations)
Features
o Safe Hot Swap for +1V to +13.2V Power Supplies
with V_IN1 or V_IN2 ≥ 2.7V
o Independent On/Off Control for Each Channel
o Internal Charge Pumps Generate N-Channel
MOSFET Gate Drives
o Inrush Current Regulated at Startup
o Circuit Breaker Function
o Adjustable Circuit Breaker/Current-Limit
Threshold from 25mV to 100mV
o VariableSpeed/BiLevel Circuit Breaker Response
o Autoretry or Latched Fault Management
o Status Outputs Indicate Fault/Safe Condition
o Output Undervoltage and Overvoltage Monitoring
or Protection
Ordering Information
PART
MAX5918AEEE
MAX5918LEEE
MAX5919AEEE
MAX5919LEEE
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 QSOP
Selector Guide and Typical Application Circuit appear at
end of data sheet.
Pin Configuration
TOP VIEW
PGOOD1 1
TIM 2
IN1 3
SENSE1 4
GATE1 5
GND 6
LIM1 7
MON1 8
MAX5918
MAX5919
16 PGOOD2
15 ON2
14 IN2
13 SENSE2
12 GATE2
11 ON1
10 LIM2
9 MON2
Variable Speed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
QSOP
________________________________________________________________ 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.