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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5090B Datasheet

High-Efficiency MAXPower Step-Down DC-DC Converters

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MAX5090A/B/C
EVALUATION KIT AVAILABLE
2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
General Description
The MAX5090A/B/C easy-to-use, high-efficiency, high-
voltage step-down DC-DC converters operate from an input
voltage up to 76V, and consume only 310µA quiescent
current at no load. This pulse-width-modulated (PWM)
converter operates at a fixed 127kHz switching frequency at
heavy loads, and automatically switches to pulse-skipping
mode to provide low quiescent current and high efficiency
at light loads. The MAX5090 includes internal frequency
compensation simplifying circuit implementation. The
device can also be synchronized with external system clock
frequency in a noise-sensitive application. The MAX5090
uses an internal low on-resistance and a high-voltage DMOS
transistor to obtain high efficiency and reduce overall system
cost. This device includes undervoltage lockout, cycle-
by-cycle current limit, hiccup-mode output short-circuit
protection, and overtemperature shutdown.
The MAX5090 delivers up to 2A output current. External
shutdown is included, featuring 19µA (typ) shutdown
current. The MAX5090A/MAX5090B versions have fixed
output voltages of 3.3V and 5V, respectively, while the
MAX5090C features an adjustable 1.265V to 11V output
voltage.
The MAX5090 is available in a space-saving 16-pin
thin QFN package (5mm x 5mm) and operates over the
automotive temperature range (-40°C to +125°C).
Applications
● Industrial
● Distributed Power
Typical Operating Circuit
VIN
7.5V TO 76V
CIN
68µF
CBYPASS
0.47µF
RIN
10
VIN
ON/OFF
DRAIN
LX
MAX5090B
BST
FB
SYNC
SGND PGND
SS
VD
CBST
0.22µF
100µH
D1
PDS5100H
3.3µF
CSS
0.047µF
VOUT
5V/2A
COUT
100µF
Features
● Wide Input Voltage Range: 6.5V to 76V
● Fixed (3.3V, 5V) and Adjustable (1.265V to 11V)
Output-Voltage Versions
● 2A Output Current
● Efficiency Up to 92%
Internal 0.26Ω High-Side DMOS FET
● 310µA Quiescent Current at No Load
● 19µA Shutdown Current
● Internal Frequency Compensation
● Fixed 127kHz Switching Frequency
● External Frequency Synchronization
● Thermal Shutdown and Short-Circuit Current Limit
● -40°C to +125°C Automotive Temperature Range
● 6-Pin (5mm x 5mm) Thin QFN Package
● Capable of Dissipating 2.67W at +70°C
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAX5090AATE+ -40°C to +125°C 16 TQFN-EP*
MAX5090AATE -40°C to +125°C 16 TQFN-EP*
MAX5090BATE+ -40°C to +125°C 16 TQFN-EP*
MAX5090BATE -40°C to +125°C 16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
3.3
3.3
5.0
5.0
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
12 11 10 9
DRAIN 13
DRAIN 14
N.C. 15
N.C. 16
EP
MA5090
8 FB
7 SS
6 SYNC
5 VD
1234
TQFN
19-3872; Rev 1; 9/14


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5090B Datasheet

High-Efficiency MAXPower Step-Down DC-DC Converters

No Preview Available !

MAX5090A/B/C
2A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converters
Absolute Maximum Ratings
(Voltages referenced to PGND, unless otherwise specified.)
VIN, DRAIN.............................................................-0.3V to +80V
SGND, PGND........................................................-0.3V to +0.3V
LX................................................................-0.8V to (VIN + 0.3V)
BST...............................................................-0.3V to (VIN + 10V)
BST to LX...............................................................-0.3V to +10V
ON/OFF.......................................................-0.3V to (VIN + 0.3V)
VD, SYNC..............................................................-0.3V to +12V
SS............................................................................... -0.3 to +4V
FB
MAX5090A/MAX5090B......................................-0.3V to +15V
MAX5090C................. 1mA (internally clamped to +2V, -0.3V)
VOUT Short-Circuit Duration.......................................Continuous
VD Short-Circuit Duration...........................................Continuous
Continuous Power Dissipation (TA = +70°C)*
16-Pin TQFN (derate 33.3mW/°C above +70°C).........2.667W
Operating Junction Temperature Range....... -40°C to +125°C
Storage Temperature Range......................... -65°C to +150°C
Junction Temperature...................................................+150°C
Lead Temperature (soldering, 10s).............................. +300°C
*As per JEDEC 51 Standard Multilayer Board.
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 = +12V, VON/OFF = +12V, VSYNC = 0V, IOUT = 0, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at
TA = +25°C. See the Typical Operating Circuit.) (Note 1)
PARAMETER
Input Voltage Range
Undervoltage Lockout
UVLO Hysteresis
Output Voltage
Output Voltage Range
Feedback Voltage
Efficiency
Quiescent Supply Current
(Note 2)
Quiescent Supply Current
(Note 2)
Quiescent Supply Current
(Note 2)
Shutdown Current
SOFT-START
Default Internal Soft-Start
Period
Soft-Start Charge Current
Soft-Start ReferenceVoltage
SYMBOL
CONDITIONS
VIN
UVLO VIN rising
UVLOHYS
MAX5090A VIN = 6.5V to 76V, IOUT = 0 to 2A
VOUT MAX5090B VIN = 7.5V to 76V, IOUT = 0 to 2A
MAX5090B VIN = 7V to 76V, IOUT = 0 to 1A
VOUT MAX5090C only
VFB MAX5090C, VIN = 6.5V to 76V
MAX5090A VIN = 12V, IOUT = 1A
η MAX5090B VIN = 12V, IOUT = 1A
MAX5090C VIN = 12V, VOUT = 5V, IOUT = 1A
MAX5090A VIN = 6.5V to 28V
IQ MAX5090B VIN = 7V to 28V
MAX5090C VIN = 6.5V to 28V
MAX5090A VIN = 6.5V to 40V
IQ MAX5090B VIN = 7V to 40V
MAX5090C VIN = 6.5V to 40V
MAX5090A VIN = 6.5V to 76V
IQ MAX5090B VIN = 7V to 76V
MAX5090C VIN = 6.5V to 76V
ISHDN VON/OFF = 0V, VIN = 14V
CSS = 0
ISS
VSS(REF)
MIN
6.5
5.70
3.20
4.85
4.85
1.265
1.191
TYP
6.17
0.5
3.3
5.0
5.0
1.228
80
88
88
310
310
310
310
310
310
310
310
310
19
MAX
76.0
6.45
3.39
5.15
5.15
11.000
1.265
UNITS
V
V
V
V
V
V
%
550
550 µA
550
570
570 µA
570
650
650 µA
650
45 µA
4.5
1.23
700
10
1.46
16.0
1.65
µs
µA
V
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX5090B
Description High-Efficiency MAXPower Step-Down DC-DC Converters
Maker Maxim Integrated Products
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MAX5090B Datasheet PDF






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