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MAX5035BUPA

Part # MAX5035BUPA
Description Switching Voltage Regulators1A, 76V, High-Efficiency MAXP
Category IC
Availability Out of Stock
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1 + $3.08771

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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

General Description
The MAX5035 easy-to-use, high-efficiency, high-volt-
age, step-down DC-DC converter operates from an
input voltage up to 76V and consumes only 350µA qui-
escent current at no load. This pulse-width modulated
(PWM) converter operates at a fixed 125kHz switching
frequency at heavy loads, and automatically switches
to pulse-skipping mode to provide low quiescent cur-
rent and high efficiency at light loads. The MAX5035
includes internal frequency compensation simplifying
circuit implementation. The device uses an internal low-
on-resistance, 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 protec-
tion, and thermal shutdown.
The MAX5035 delivers up to 1A output current. External
shutdown is included, featuring 10µA (typ) shutdown
current. The MAX5035A/B/C versions have fixed output
voltages of 3.3V, 5V, and 12V, respectively, while the
MAX5035D features an adjustable output voltage from
1.25V to 13.2V.
The MAX5035 is available in space-saving 8-pin SO
and 8-pin plastic DIP packages and operates over the
industrial (0°C to +85°C) temperature range.
Applications
Consumer Electronics
Industrial
Distributed Power
Features
♦ Wide 7.5V to 76V Input Voltage Range
♦ Fixed (3.3V, 5V, 12V) and Adjustable
(1.25V to 13.2V) Versions
♦ 1A Output Current
♦ Efficiency Up to 94%
♦ Internal 0.4Ω High-Side DMOS FET
♦ 350µA Quiescent Current at No Load, 10µA
Shutdown Current
♦ Internal Frequency Compensation
♦ Fixed 125kHz Switching Frequency
♦ Thermal Shutdown and Short-Circuit Current
Limit
♦ 8-Pin SO and PDIP Packages
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-2988; Rev 0; 9/03
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.
PART TEMP RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAX5035AUSA 0°C to +85°C 8 SO
MAX5035AUPA 0°C to +85°C 8 PDIP
3.3
MAX5035BUSA 0°C to +85°C 8 SO
MAX5035BUPA 0°C to +85°C 8 PDIP
5.0
MAX5035CUSA 0°C to +85°C 8 SO
MAX5035CUPA 0°C to +85°C 8 PDIP
12
MAX5035DUSA 0°C to +85°C 8 SO
MAX5035DUPA 0°C to +85°C 8 PDIP
ADJ
1
2
3
4
BST
VD
SGND
FB
8
7
6
5
LX
TOP VIEW
V
IN
GND
ON/OFF
MAX5035
SO/PDIP
Pin Configuration
MAX5035
GND
BST
LX
V
IN
SGND
FB
D1
50SQ100
VD
100µH
V
OUT
5V
V
IN
7.5V TO 76V
68µF
0.1µF
0.1µF
68µF
ON
OFF
R1
R2
ON/OFF
Typical Operating Circuit
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
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.
(Voltages referenced to GND, unless otherwise specified.)
V
IN
.........................................................................-0.3V to +80V
SGND ....................................................................-0.3V to +0.3V
LX.................................................................-0.8V to (V
IN
+ 0.3V)
BST ...............................................................-0.3V to (V
IN
+ 10V)
BST (transient < 100ns)................................-0.3V to (V
IN
+ 15V)
BST to LX................................................................-0.3V to +10V
BST to LX (transient < 100ns) ................................-0.3V to +15V
ON/OFF........................................................-0.3V to (V
IN
+ 0.3V)
VD...........................................................................-0.3V to +12V
FB
MAX5035A/MAX5035B/MAX5035C ...................-0.3V to +15V
MAX5035D .........................................................-0.3V to +12V
V
OUT
Short-Circuit Duration...........................................Indefinite
VD Short-Circuit Duration ..............................................Indefinite
Continuous Power Dissipation (T
A
= +70°C)
8-Pin PDIP (derate 9.1mW/°C above +70°C)...............727mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
Operating Temperature Range
MAX5035_U_ _ ...................................................0°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
IN
= +12V, V
ON/OFF
= +12V, I
OUT
= 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the
Typical Application Circuit.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5035A 7.5 76.0
MAX5035B 7.5 76.0
MAX5035C 15 76
Input Voltage Range V
IN
MAX5035D 7.5 76.0
V
Undervoltage Lockout UVLO 5.2 V
MAX5035A
V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 1A
3.185 3.3 3.415
MAX5035B
V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 1A
4.85 5.0 5.15
Output Voltage V
OUT
MAX5035C
V
IN
= 15V to 76V,
I
OUT
= 20mA to 1A
11.64 12 12.36
V
Feedback Voltage V
FB
V
IN
= 7.5V to 76V, MAX5035D 1.192 1.221 1.250 V
V
IN
= 12V, I
LOAD
= 0.5A, MAX5035A 86
V
IN
= 12V, I
LOAD
= 0.5A, MAX5035B 90
V
IN
= 24V, I
LOAD
= 0.5A, MAX5035C 94Efficiency η
V
IN
= 12V, V
OUT
= 5V, I
LOAD
= 0.5A,
MAX5035D
90
%
V
FB
= 3.5V, V
IN
= 7.5V to 76V, MAX5035A 350 460
V
FB
= 5.5V, V
IN
= 7.5V to 76V, MAX5035B 350 460
V
FB
= 13V, V
IN
= 15V to 76V, MAX5035C 350 460
Quiescent Supply Current I
Q
V
FB
= 1.3V, MAX5035D 350 460
µA
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +12V, V
ON/OFF
= +12V, I
OUT
= 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the
Typical Application Circuit.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Shutdown Current I
SHDN
V
ON/OFF
= 0V, V
IN
= 7.5V to 76V 10 45 µA
Peak Switch Current Limit I
LIM
(Note 1) 1.80 2.40 A
Switch Leakage Current I
OL
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V 1 µA
Switch On-Resistance R
DS
(
ON
)
I
SWITCH
= 1A 0.40 0.80 Ω
PFM Threshold I
PFM
Minimum switch current in any cycle 55 85 110 mA
FB Input Bias Current I
B
MAX5035D -12 +0.01 +12 nA
ON/OFF CONTROL INPUT
ON/OFF Input-Voltage Threshold V
ON/OFF
Rising trip point 1.53 1.69 1.85 V
ON/OFF Input-Voltage Hysteresis V
HYST
100 mV
ON/OFF Input Current I
ON/OFF
V
ON/OFF
= 0V to V
IN
10 150 nA
OSCILLATOR
Oscillator Frequency f
OSC
109 125 135 kHz
Maximum Duty Cycle D
MAX
MAX5035D 95 %
VOLTAGE REGULATOR
Regulator Output Voltage VD V
IN
= 8.5V to 76V, I
L
= 0mA 6.9 7.8 8.8 V
Dropout Voltage 7.5V ≤ V
IN
≤ 8.5V, I
L
= 1mA 2.0 V
Load Regulation ∆VD/∆I
VD
0 to 5mA 150 mV/mA
PACKAGE THERMAL CHARACTERISTICS
SO package (JEDEC 51) 170
Thermal Resistance
(Junction to Ambient)
θ
JA
DIP package (JEDEC 51) 110
°C/W
THERMAL SHUTDOWN
Thermal-Shutdown Junction
Temperature
T
SH
+160 °C
Thermal-Shutdown Hysteresis T
HYST
20 °C
Note 1: Switch current at which current limit is activated.
123456NEXT
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