MAX5950 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – 12V PWM Controller with Hot-Swap

19-0545; Rev 0; 6/06
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12V PWM Controller with Hot-Swap
General Description
The MAX5950 is a 12V pulse-width modulated (PWM),
step-down, DC-DC controller with integrated hot-swap
controller. The device operates over the 8V to 16V input-
voltage range or 5V ±10% and provides an adjustable
output from 0.8V to 5.5V. The device delivers up to 10A
of load current with excellent load-and-line regulation.
The MAX5950 is optimized for PCIe^® ExpressModule™
power-management application.
The MAX5950 features a hot-swap controller that pro-
vides inrush current control during module insertion
and removal, as well as short-circuit protection during
normal operation. The MAX5950 features an internal
charge pump that provides the gate drive for an exter-
nal n-channel MOSFET. A DCENO logic output indi-
cates the completion of the inrush cycle.
The MAX5950 PWM section utilizes a voltage-mode con-
trol scheme for good noise immunity and offers external
compensation, allowing for maximum flexibility with a
wide selection of inductor values and capacitor types.
The device operates at a fixed switching frequency that
is programmable from 100kHz to 1MHz and can be syn-
chronized to an external clock signal through the
SYNCIN input. The device includes undervoltage lockout
(UVLO) and digital soft-start. Protection features include
lossless valley-mode current limit, hiccup-mode output
short-circuit protection, and thermal shutdown.
The MAX5950 is available in a space-saving 5mm x
5mm, 32-pin thin QFN package and is specified for
operation over the -40°C to +85°C extended tempera-
ture range. Refer to the MAX5951 data sheet for a pin-
compatible, general-purpose PWM controller.
Applications
PCIe ExpressModule
General 12V-Input PWM Controllers with
Hot-Swap
Blade Servers
RAID
Base Stations
Work Stations
Features
o 8V to 16V or 5V ±10% Input-Voltage Range
o Integrated Hot-Swap Controller
o Lossless Valley-Mode Current Sensing
o Output Voltage Adjustable from 0.8V to 5.5V
o Voltage-Mode Control
o External Compensation for Maximum Flexibility
o Digital Soft-Start
o Sequencing or Ratiometric Tracking
o Startup Synchronization
o Programmable PGOOD Output
o Programmable Switching Frequency from 100kHz
to 1MHz
o External Frequency Synchronization
o SYNCIN and SYNCOUT Enable 180° Out-of-Phase
Operation
o Thermal Shutdown and Short-Circuit Protection
o Space-Saving 5mm x 5mm, 32-Pin TQFN Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX5950ETJ+ -40°C to +85°C 32 TQFN-EP*
+Denotes lead-free package.
*EP = Exposed pad.
PKG
CODE
T3255-4
Pin Configuration
TOP VIEW
24 23 22 21 20 19 18 17
CS- 25
16 SYNCIN
PGND 26
15 SYNCOUT
DL 27
14 AGND
DREG 28
LX 29
MAX5950
13 THRESH
12 DCENI
DH 30
11 DCENO
BST 31
10 PGI
REG 32
9 MPWRGD
[phone]
PCIe is a registered trademark and ExpressModule is a
trademark of PCI-SIG Corp.
TQFN
(5mm x 5mm)
________________________________________________________________ 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.