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MAX5083ATE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
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 val-
ues 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 lock-
out and soft-start. Protection features include cycle-by-
cycle current limit, hiccup-mode output short-circuit
protection, and thermal 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 Automotive
Distributed Power Industrial
Features
♦ 4.5V to 40V (MAX5082) or 7.5V to 40V (MAX5083)
Input Voltage Range
♦ 1.5A Output Current
♦ V
OUT
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
MAX5082/MAX5083
1.5A, 40V, MAXPower Step-Down
DC-DC Converters
________________________________________________________________ Maxim Integrated Products 1
19-3657; Rev 0; 5/05
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.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX5082ATE -40°C to +125°C 16 TQFN-EP*
MAX5083ATE -40°C to +125°C 16 TQFN-EP*
MAX5082
V
IN
4.5V TO 40V
ON/OFF
C1
R1
R2
C2
PGND
REG
LX
FB
IN
SYNC SGND PGND SS COMP
DVREG
C-
C
F
V
OUT
PGND
C
BST
C
SS
D1
D2
L1
C8
C5
R6
R5
C+
BST
C7
C6
R3
R4
Typical Operating Circuits
FireWire is a registered trademark of Apple Computer, Inc.
Typical Operating Circuits continued at end of data sheet.
*EP = Exposed pad.
Pin Configurations appear at end of data sheet.
MAX5082/MAX5083
1.5A, 40V, MAXPower Step-Down
DC-DC Converters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
IN, ON/OFF to SGND..............................................-0.3V to +45V
LX to SGND .................................................-0.3V to (V
IN
+ 0.3V)
BST to SGND ................................................-0.3V to (V
IN
+ 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 (V
REG
+ 0.3V)
C+ to PGND (MAX5082 only)................(V
DVREG
- 0.3V) to +12V
C- to PGND (MAX5082 only)................-0.3V to (V
DVREG
+ 0.3V)
Continuous current through internal power MOSFET (pins 11/12
connected together and pins 13/14 connected together)
T
J
= +125°C.........................................................................3A
T
J
= +150°C.........................................................................2A
Continuous Power Dissipation
*
(T
A
= +70°C)
16-Pin TQFN (derate 33.3mW/°C above +70°C) ...2666.7mW
16-Pin TQFN (θ
JA
)........................................................30°C/W
16-Pin TQFN (θ
JC
).......................................................1.7°C/W
Operating Temperature Range .........................-40
o
C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
IN
= V
ON/OFF
= 12V, V
REG
= V
DVREG
, V
SYNC
= PGND = SGND, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values
are at T
A
= + 25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5082 4.5 40
Input Voltage Range V
IN
MAX5083 7.5 40
V
V
IN
rising, MAX5082 3.9 4.2
Undervoltage Lockout Threshold UVLO
V
IN
rising, MAX5083 6.8 7.3
V
MAX5082 0.4
Undervoltage Lockout Hysteresis UVLO
HYST
MAX5083 0.7
V
V
FB
= 0V, MAX5082 10.5
Switching Supply Current (PWM
Operation)
I
SW
V
FB
= 0V, MAX5083 9.5
mA
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.5A 84
Efficiency
V
IN
= 4.5V, V
OUT
= 3.3V, I
OUT
= 1.5A
(MAX5082)
88
%
MAX5082 1.4 2.5
No-Load Supply Current
(PFM Operation)
MAX5083 1.3 2.3
mA
Shutdown Current I
SHDN
V
ON/OFF
= 0V, V
IN
= 40V 200 300 µA
ON/OFF CONTROL
Input Voltage Threshold V
ON/OFF
V
ON/OFF
rising 1.20 1.23 1.25 V
Input Voltage Hysteresis 0.12 V
Input Bias Current V
ON/OFF
= 0 to 40V -250 +250 nA
ERROR AMPLIFIER/SOFT-START
Soft-Start Current I
SS
81524µA
Reference Voltage (Soft-Start) V
SS
1.215 1.228 1.240 V
FB Regulation Voltage V
FB
I
COMP
= -500µA to +500µA 1.215 1.228 1.240 V
FB Input Range 0 1.5 V
FB Input Current -250 +250 nA
COMP Voltage Range I
COMP
= -500µA to +500µA 0.25 4.50 V
Open-Loop Gain 80 dB
Unity-Gain Bandwidth 1.8 MHz
FB Offset Voltage I
COMP
= -500µA to +500µA -5 +5 mV
*As per JEDEC 51 Standard.
MAX5082/MAX5083
1.5A, 40V, MAXPower Step-Down
DC-DC Converters
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
ON/OFF
= 12V, V
REG
= V
DVREG
, V
SYNC
= PGND = SGND, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values
are at T
A
= + 25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OSCILLATOR
Frequency f
SW
V
SYNC
= 0V 225 250 275 kHz
V
SYNC
= 0V, V
IN
= 4.5V, MAX5082 87
V
SYNC
= 0V, V
IN
= 7.5V, MAX5083 87Maximum Duty Cycle D
MAX
V
SYNC
= 0V, V
IN
≤ 40V 87
%
SYNC High-Level Voltage 2.2 V
SYNC Low-Level Voltage 0.8 V
SYNC Frequency Range f
SYNC
150 350 kHz
PWM Modulator Gain f
SYNC
= 150kHz to 350kHz 10 V/V
Ramp Level Shift (Valley) 0.3 V
POWER SWITCH
Switch On-Resistance V
BST
- V
LX
= 6V 0.3 0.6 Ω
Switch Gate Charge V
BST
- V
LX
= 6V 6 nC
Switch Leakage Current V
IN
= 40V, V
LX
= V
BST
= 0V 10 µA
BST Leakage Current V
BST
= V
LX
= V
IN
= 40V 10 µA
CHARGE PUMP
C- Output Voltage Low MAX5082 only, sinking 10mA 0.1 V
C- Output Voltage High
MAX5082 only, relative to DVREG,
sourcing 10mA
0.1 V
DVREG to C+ On-Resistance MAX5082 only, sourcing 10mA 10 Ω
LX to PGND On-Resistance Sinking 10mA 12 Ω
CURRENT-LIMIT COMPARATOR
Pulse-Skip Threshold I
PFM
100 200 300 mA
Cycle-by-Cycle Current Limit I
ILIM
1.9 2.7 3.5 A
Number of Consecutive ILIM
Events to Hiccup
4
Hiccup Timeout 512
Clock
periods
INTERNAL VOLTAGE REGULATOR
MAX5082 4.75 5 5.25
Output Voltage V
REG
MAX5083 7.6 8 8.4
V
V
IN
= 5.5V to 40V, MAX5082 1
Line Regulation
V
IN
= 9.0V to 40V, MAX5083 1
mV/V
Load Regulation I
REG
= 0 to 20mA 0.25 V
V
IN
= 4.5V, I
REG
= 20mA, MAX5082 0.5
Dropout Voltage
V
IN
= 7.5V, I
REG
= 20mA, MAX5083 0.5
V
THERMAL SHUTDOWN
Thermal Shutdown Temperature Temperature rising +160 °C
Thermal Shutdown Hysteresis 20 °C
Note 1: 100% production tested at T
A
= +25°C and T
A
= +125°C. Limits at -40°C are guaranteed by design.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX5083ATE+T

Mfr. #:
Buy MAX5083ATE+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 1A 40V MAXPower Step-Down
Lifecycle:
New from this manufacturer.
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