Rainbow Electronics MAX5961 - Manual

General Description
The MAX5961 0 to 16V, quad, hot-swap controller pro-
vides complete protection for systems with up to four
distinct supply voltages. The device allows the safe
insertion and removal of circuit cards into live back-
planes. The MAX5961 is an advanced hot-swap con-
troller that monitors voltage and current with an internal
10-bit ADC. The device provides two levels of overcur-
rent circuit-breaker protection; a fast-trip threshold for a
fast turn-off, and a lower slow-trip threshold for a
delayed turn-off. The maximum overcurrent circuit-
breaker threshold range is set independently for each
channel with a trilevel input (ILIM_) or by programming
though an I
2 C interface.
The internal 10-bit ADC is multiplexed to monitor the
output voltage and current of each hot-swap channel.
The total time to cycle through all the eight measure-
ments is 100µs (typ). Each 10-bit value is stored in an
internal circular buffer so that 50 past samples of each
signal can be read back through the I
2 C interface at
any time or after a fault condition.
The MAX5961 can be configured as four independent
hot-swap controllers, hot-swap controllers operating in
pairs, or as a group of four hot-swap controllers.
The device also includes five digital comparators per
hot-swap channel to implement overcurrent warning,
two levels of overvoltage detection, and two levels of
undervoltage detection. The limits for overcurrent, over-
voltage, and undervoltage are user-programmable.
When any of the measured values violates the program-
mable limits, an external ALERT signal is asserted. In
addition to the ALERT signal, depending on the select-
ed operating mode, the MAX5961 can deassert a
power-good signal and/or turn-off the external MOSFET.
The MAX5961 is available in a 48-pin thin QFN pack-
age and operates over the -40°C to +85°C extended
temperature range.
Applications
PCI Express ® Hot Plug
Servers
Disk Drives
Storage Systems
ASICs
Features
♦ Four Independent Hot-Swap Controllers Protect
from 0 to 16V (Provided IN ≥ 2.7V)
♦ 10-Bit ADC Monitors Voltage and Current of Each
Channel
♦ Circular Buffer Stores 5ms of Current and Voltage
Measurements
♦ Four Independent Internal Charge Pumps
Generate n-Channel MOSFET Gate Drives
♦ Internal 500mA Gate Pulldown Current for Fast
Shutdown
♦ VariableSpeed/BiLevel™ Circuit-Breaker Protection
♦ Alert Output Indicates Undervoltage Warning,
Undervoltage Critical, Overvoltage Warning,
Overvoltage Critical, and Overcurrent Warning for
Each Channel
♦ Independent Power-Good Outputs
♦ Autoretry or Latched Fault Management
♦ 400kHz I
2
C Interface
♦ 7mm x 7mm 48-Pin TQFN Package
MAX5961
0 to 16V, Quad, Hot-Swap Controller
with 10-Bit Current and Voltage Monitor
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
MAX5961
THIN QFN
7mm x 7mm
13
14
15
16
17
18
19
20
21
22
23
24
FAULT1
FAULT2
FAULT3
FAULT4
SDA
SCL
ALERT
PG1
PG2
PG3
PG4
DGND
48
47
46
45
44
43
42
41
40
39
38
37
1 2 3 4 5 6 7 8 9 10 11 12
HWEN
MODE
PROT
A0
A1
REG
AGND
IN
ILIM1
ILIM2
ILIM3
ILIM4
ON3 ON1
DREG
POL
SENSE3
MON3 GATE3 GND3 GND1 GATE1 MON1
SENSE1
36
+
35 34 33 32 31 30 29 28 27 26 25
ON4 ON2 RETRY I.C. SENSE4 MON4 GATE4 GND4 GND2 GATE2 MON2 SENSE2
Pin Configuration
Ordering Information
19-4167; Rev 0; 6/08
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX5961ETM+ -40°C to +85°C 48 Thi n QFN–E P *
PCI Express is a registered trademark of PCI-SIG Corp.
VariableSpeed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.