MAX5035AUSA-MAX5035DUPA Fast Delivery |IC PHOENIX CO.,LIMITED

MAX5035AUSA ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SO5.0Consumer ElectronicsMAX5035BUPA 0°C to +85°C 8 PDIPIndu ..
MAX5035AUSA+ ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterFeaturesThe MAX5035 easy-to-use, high-efficiency, high-volt-♦ Wide 7.5V to 76V Input Voltage Rangea ..
MAX5035BASA ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterELECTRICAL CHARACTERISTICS (MAX5035_U_ _)(V = +12V, V = +12V, I = 0, T = 0°C to +85°C, unless other ..
MAX5035BASA ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SOMAX5035BUPA 0°C to +85°C 8 PDIPAutomotive5.0MAX5035BASA -4 ..
MAX5035BASA+ ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterApplicationsMAX5035BUSA 0°C to +85°C 8 SOMAX5035BUPA 0°C to +85°C 8 PDIPAutomotive5.0MAX5035BASA -4 ..
MAX5035BASA+T ,1A, 76V, High-Efficiency MAXPower Step-Down DC-DC ConverterELECTRICAL CHARACTERISTICS (MAX5035_U_ _)(V = +12V, V = +12V, I = 0, T = 0°C to +85°C, unless other ..
MAX921CSA+T ,Ultra Low-Power, Single/Dual-Supply ComparatorsELECTRICAL CHARACTERISTICS: 5V OPERATION(V+ = 5V, V- = GND = 0V, T = T to T , unless otherwise note ..
MAX921CSA-T ,Ultra Low-Power, Single/Dual-Supply ComparatorsFeatures®The MAX921–MAX924 single, dual, and quad micro-♦ µMAX Package—Smallest 8-Pin SOpower, low- ..
MAX921CUA ,Ultra Low-Power, Single/Dual-Supply ComparatorsELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)(V+ = 5V, V- = GND = 0V, T = T to T , unless ot ..
MAX921CUA ,Ultra Low-Power, Single/Dual-Supply ComparatorsApplications5 HYSTBattery-Powered SystemsThreshold DetectorsMAX9216 REFWindow ComparatorsGNDV-21Osc ..
MAX921CUA ,Ultra Low-Power, Single/Dual-Supply ComparatorsMAX921–MAX92419-0115; Rev 3; 3/95Ultra Low-Power, Single/Dual-Supply Comparators_______________
MAX921CUA+ ,Ultra Low-Power, Single/Dual-Supply ComparatorsMAX921–MAX92419-0115; Rev 6; 4/09Ultra Low-Power, Single/Dual-Supply Comparators_______________

MAX5035AUSA-MAX5035DUPA
1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
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
FeaturesWide 7.5V to 76V Input Voltage RangeFixed (3.3V, 5V, 12V) and Adjustable
(1.25V to 13.2V) Versions1A Output CurrentEfficiency Up to 94%Internal 0.4ΩHigh-Side DMOS FET350µA Quiescent Current at No Load, 10µA
Shutdown CurrentInternal Frequency CompensationFixed 125kHz Switching FrequencyThermal Shutdown and Short-Circuit Current
Limit8-Pin SO and PDIP Packages
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Ordering Information
19-2988; Rev 0; 9/03
Pin Configuration
Typical Operating Circuit
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
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.)
VIN.........................................................................-0.3V to +80V
SGND....................................................................-0.3V to +0.3V
LX.................................................................-0.8V to (VIN+ 0.3V)
BST...............................................................-0.3V to (VIN+ 10V)
BST (transient < 100ns)................................-0.3V to (VIN+ 15V)
BST to LX................................................................-0.3V to +10V
BST to LX (transient < 100ns)................................-0.3V to +15V
ON/OFF........................................................-0.3V to (VIN+ 0.3V)
VD...........................................................................-0.3V to +12V
MAX5035A/MAX5035B/MAX5035C...................-0.3V to +15V
MAX5035D.........................................................-0.3V to +12V
VOUTShort-Circuit Duration...........................................Indefinite
VD Short-Circuit Duration..............................................Indefinite
Continuous Power Dissipation (TA= +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
(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the
Typical Application Circuit.)
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +12V, VON/OFF= +12V, IOUT= 0, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the
Typical Application Circuit.)
Note 1:Switch current at which current limit is activated.
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX5035AUSA, VOUT = 3.3V)
MAX5035 toc01
TEMPERATURE (°C)
OUT
(V)5025
OUTPUT VOLTAGE vs. TEMPERATURE
(MAX5035DUSA, VOUT = 5V)
MAX5035 toc02
TEMPERATURE (°C)
OUT
(V)2550
LINE REGULATION
(MAX5035AUSA, VOUT = 3.3V)
MAX5035 toc03
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)503520
LINE REGULATION
(MAX5035DUSA, VOUT = 5V)
MAX5035 toc04
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)502035
LOAD REGULATION
(MAX5035AUSA, VOUT = 3.3V)
MAX5035 toc05
ILOAD (mA)
OUT
(V)
LOAD REGULATION
(MAX5035DUSA, VOUT = 5V)
MAX5035 toc06
ILOAD (mA)
OUT
(V)
Typical Operating Characteristics
(VIN= 12V, VON/OFF= 12V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical Application
Circuit, if applicable.)
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
OUTPUT CURRENT LIMIT
vs. TEMPERATURE
MAX5035 toc10
TEMPERATURE (°C)
OUTPUT CURRENT LIMIT (A)5025
OUTPUT CURRENT LIMIT
vs. INPUT VOLTAGE
MAX5035 toc11
INPUT VOLTAGE (V)
OUTPUT CURRENT LIMIT (A)503520
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX5035 toc12
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (5025
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX5035 toc13
INPUT VOLTAGE (V)
QUIESCENT SUPPLY CURRENT (5646362616
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5035 toc14
TEMPERATURE (°C)
SHUTDOWN CURRENT (5025100
SHUTDOWN CURRENT vs. INPUT VOLTAGE
MAX5035 toc15
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (5646362616
EFFICIENCY vs. LOAD CURRENT
(MAX5035AUSA, VOUT = 3.3V)
MAX5035 toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY vs. LOAD CURRENT
(MAX5035DUSA, VOUT = 5V)
MAX5035 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY vs. LOAD CURRENT
(MAX5035DUSA, VOUT = 12V)
MAX5035 toc09
LOAD CURRENT (mA)
EFFICIENCY (%)
Typical Operating Characteristics (continued)
(VIN= 12V, VON/OFF= 12V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical Application
Circuit, if applicable.)
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX5035 toc16
VIN (V)
OUT
(V)963
MAX5035DUSA
LOAD-TRANSIENT RESPONSE
MAX5035 toc17
400µs/div
A: VOUT, 200mV/div, AC-COUPLED
B: IOUT, 500mA/div, 0.1A TO 1A
MAX5035DUSA
LOAD-TRANSIENT RESPONSE
MAX5035 toc18
400µs/div
A: VOUT, 200mV/div, AC-COUPLED
B: VOUT, 500mA/div, 0.5A TO 1A
Typical Operating Characteristics (continued)
(VIN= 12V, VON/OFF= 12V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical Application
Circuit, if applicable.)
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
MAX5035DUSA LX WAVEFORMS
MAX5035 toc22
4µs/div
A: SWITCH VOLTAGE (LX PIN), 20V/div, VIN = 48V
B: INDUCTOR CURRENT, 200mA/div (IOUT = 0)
MAX5035DUSA STARTUP WAVEFORM
(IO = 0)
MAX5035 toc23
1ms/div
A: VON/OFF, 2V/div
B: VOUT, 2V/div
MAX5035DUSA STARTUP WAVEFORM
(IO = 1A)
MAX5035 toc24
1ms/div
A: VON/OFF, 2V/div
B: VOUT, 2V/div
PEAK SWITCH CURRENT
vs. INPUT VOLTAGE
MAX5035 toc25
INPUT VOLTAGE (V)
PEAK SWITCH CURRENT (A)6646362616
Typical Operating Characteristics (continued)
(VIN= 12V, VON/OFF= 12V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C. See the Typical Application
Circuit, if applicable.)
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Block Diagram
MAX5035
1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
Detailed Description
The MAX5035 step-down DC-DC converter operates
from a 7.5V to 76V input voltage range. A unique volt-
age-mode control scheme with voltage feedforward
and an internal switching DMOS FET provides high effi-
ciency over a wide input voltage range. This pulse-
width modulated converter operates at a fixed 125kHz
switching frequency. The device also features automat-
ic pulse-skipping mode to provide low quiescent cur-
rent and high efficiency at light loads. Under no load,
the MAX5035 consumes only 350µA, and in shutdown
mode, consumes only 10µA. The MAX5035 also fea-
tures undervoltage lockout, hiccup mode output short-
circuit protection, and thermal shutdown.
Shutdown Mode
Drive ON/OFFto ground to shut down the MAX5035.
Shutdown forces the internal power MOSFET off, turns
off all internal circuitry, and reduces the VINsupply cur-
rent to 10µA (typ). The ON/OFFrising threshold is
1.69V (typ). Before any operation begins, the voltage at
ON/OFFmust exceed 1.69V (typ). The ON/OFFinput
has 100mV hysteresis.
Undervoltage Lockout (UVLO)
Use the ON/OFFfunction to program the UVLO thresh-
old at the input. Connect a resistive voltage-divider
from VINto GND with the center node to ON/OFFas
shown in Figure 1. Calculate the threshold value by
using the following formula:
The minimum recommended VUVLO(TH)is 6.5V, 7.5V,
and 13V for the output voltages of 3.3V, 5V, and 12V,
respectively. The recommended value for R2 is less
than 1MΩ.
If the external UVLO threshold-setting divider is not
used, an internal undervoltage lockout feature monitors
the supply voltage at VINand allows operation to start
when VINrises above 5.2V (typ). This feature can be
used only when VINrise time is faster than 2ms. For
slower VINrise time, use the resistive-divider at
ON/OFF.
Boost High-Side Gate Drive (BST)
Connect a flying bootstrap capacitor between LX and
BST to provide the gate-drive voltage to the high-side
N-channel DMOS switch. The capacitor is alternately
charged from the internally regulated output voltage VD
and placed across the high-side DMOS driver. Use a
0.1µF, 16V ceramic capacitor located as close to the
device as possible.
On startup, an internal low-side switch connects LX to
ground and charges the BST capacitor to VD. Once the
BST capacitor is charged, the internal low-side switch
is turned off and the BST capacitor voltage provides
the necessary enhancement voltage to turn on the
high-side switch.
Thermal Overload Protection
The MAX5035 features integrated thermal overload pro-
tection. Thermal overload protection limits total power
dissipation in the device, and protects the device in the
event of a fault condition. When the die temperature
exceeds +160°C, an internal thermal sensor signals the
shutdown logic, turning off the internal power MOSFET
and allowing the IC to cool. The thermal sensor turns the
internal power MOSFET back on after the IC’s die tem-
perature cools down to +140°C, resulting in a pulsed
output under continuous thermal overload conditions.
Applications Information
Setting the Output Voltage
The MAX5035A/B/C have preset output voltages of 3.3V,
5.0V, and 12V, respectively. Connect FB to the preset
output voltage (see the Typical Operating Circuit).
The MAX5035D offers an adjustable output voltage. Set
the output voltage with a resistive voltage-divider con-
nected from the circuit’s output to ground (Figure 1).
Connect the center node of the divider to FB. Choose
R4 less than 15kΩ, then calculate R3 as follows:
Figure 1. Adjustable Output Voltage

Partno	Mfg	Dc	Qty	Available	Descript
MAX5035AUSA	MAXIM	N/a	99	avai	1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter
MAX5035DUPA	MAXIM	N/a	10	avai	1A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converter