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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5082 Datasheet

1.5A / 40V / MAXPower Step-Down DC-DC Converters

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MAX5082/MAX5083
EVALUATION KIT AVAILABLE
1.5A, 40V, MAXPower Step-Down
DC-DC Converters
General Description
The MAX5082/MAX5083 are 250kHz PWM step-down
DC-DC converters with an on-chip, 0.3Ω high-side
switch. The input voltage range is 4.5V to 40V for the
MAX5082 and 7.5V to 40V for the MAX5083. The output
is adjustable from 1.23V to 32V and can deliver up to
1.5A of load current.
Both devices utilize a voltage-mode control scheme for
good noise immunity in the high-voltage switching envi-
ronment and offer external compensation allowing for
maximum flexibility with a wide selection of inductor values
and capacitor types. The switching frequency is internally
fixed at 250kHz and can be synchronized to an external
clock signal through the SYNC input. Light load efficiency is
improved by automatically switching to a pulse-skip mode.
All devices include programmable undervoltage lockout and
soft-start. Protection features include cycle-bycycle current
limit, hiccup-mode output short-circuit protection, and ther-
mal shutdown. Both devices are available in a space-saving,
high-power (2.7W), 16-pin TQFN package and are rated for
operation over the -40°C to +125°C temperature range.
Applications
FireWire® Power Supplies
● Industrial
● Distributed Power
FireWire is a registered trademark of Apple Computer, Inc.
Typical Application Circuits
VIN
4.5V TO 40V
CF
Features
4.5V to 40V (MAX5082) or 7.5V to 40V (MAX5083)
Input Voltage Range
1.5A Output Current
VOUT Range From 1.23V to 32V
Internal High-Side Switch
Fixed 250kHz Internal Oscillator
Automatic Switchover to Pulse-Skip Mode at Light
Loads
External Frequency Synchronization
Thermal Shutdown and Short-Circuit Protection
Operates Over the -40°C to +125°C Temperature
Range
Space-Saving (5mm x 5mm) High-Power 16-Pin
TQFN Package
Ordering Information
PART
TEMP RANGE
MAX5082ATE
-40°C to +125°C
MAX5083ATE
-40°C to +125°C
*EP = Exposed pad.
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
Pin Configurations appears at end of data sheet.
D1
R1
C1
IN
REG
DVREG C-
C+
MAX5082
BST
LX
ON/OFF
R2 SYNC SGND PGND
C2
PGND
Typical Operating Circuits continued at end of data sheet.
FB
SS COMP
CSS
CBST
L1
D2
C8
R5
C6
C5
R6
VOUT
R3
C7 R4
PGND
19-3657; Rev 1; 5/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5082 Datasheet

1.5A / 40V / MAXPower Step-Down DC-DC Converters

No Preview Available !

MAX5082/MAX5083
1.5A, 40V, MAXPower Step-Down
DC-DC Converters
Absolute Maximum Ratings
IN, ON/OFF to SGND..............................................-0.3V to +45V
LX to SGND.................................................-0.3V to (VIN + 0.3V)
BST to SGND................................................-0.3V to (VIN + 12V)
BST to LX................................................................-0.3V to +12V
PGND to SGND.....................................................-0.3V to +0.3V
REG, DVREG, SYNC to SGND...............................-0.3V to +12V
FB, COMP, SS to SGND..........................-0.3V to (VREG + 0.3V)
C+ to PGND (MAX5082 only)..............(VDVREG - 0.3V) to +12V
C- to PGND (MAX5082 only)..............-0.3V to (VDVREG + 0.3V)
Continuous current through internal power MOSFET (pins 11/12
connected together and pins 13/14 connected together)
TJ = +125°C.........................................................................3A
TJ = +150°C.........................................................................2A
Continuous Power Dissipation* (TA = +70°C)
16-Pin TQFN (derate 33.3mW/°C above +70°C)....2666.7mW
16-Pin TQFN (θJA).......................................................30°C/W
16-Pin TQFN (θJC)......................................................1.7°C/W
Operating Temperature Range...........................-40oC to +125°C
Maximum Junction Temperature.......................................+150°C
Storage Temperature Range..............................-60°C to +150°C
Lead Temperature (soldering, 10s)...................................+300°C
*As per JEDEC 51 Standard.
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
(VIN = VON/OFF = 12V, VREG = VDVREG, VSYNC = PGND = SGND, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values
are at TA = + 25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
MAX5082
VIN MAX5083
4.5 40
V
7.5 40
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
UVLO
UVLOHYST
VIN rising, MAX5082
VIN rising, MAX5083
MAX5082
MAX5083
3.9 4.2
6.8 7.3
0.4
0.7
V
V
Switching Supply Current (PWM
Operation)
Efficiency
ISW
VFB = 0V, MAX5082
VFB = 0V, MAX5083
VIN = 12V, VOUT = 3.3V, IOUT = 1.5A
VIN = 4.5V, VOUT = 3.3V, IOUT = 1.5A
(MAX5082)
10.5
9.5
84
88
mA
%
No-Load Supply Current
(PFM Operation)
MAX5082
MAX5083
1.4 2.5
1.3 2.3
mA
Shutdown Current
ON/OFF CONTROL
ISHDN
VON/OFF = 0V, VIN = 40V
200 300
µA
Input Voltage Threshold
Input Voltage Hysteresis
VON/OFF VON/OFF rising
1.20 1.23 1.25
0.12
V
V
Input Bias Current
ERROR AMPLIFIER/SOFT-START
VON/OFF = 0 to 40V
-250
+250
nA
Soft-Start Current
Reference Voltage (Soft-Start)
FB Regulation Voltage
FB Input Range
ISS
VSS
VFB ICOMP = -500μA to +500μA
8
1.215
1.215
0
15
1.228
1.228
24
1.240
1.240
1.5
µA
V
V
V
FB Input Current
-250
+250
nA
COMP Voltage Range
Open-Loop Gain
ICOMP = -500μA to +500μA
0.25
4.50
V
80 dB
Unity-Gain Bandwidth
1.8 MHz
FB Offset Voltage
ICOMP = -500μA to +500μA
-5 +5 mV
www.maximintegrated.com
Maxim Integrated │2


Part Number MAX5082
Description 1.5A / 40V / MAXPower Step-Down DC-DC Converters
Maker Maxim Integrated Products
Total Page 18 Pages
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