MAX5035DASA/V+T Maxim Integrated Products, MAX5035DASA/V+T Datasheet

IC DC/DC CONV STP-DWN 8-SOIC

MAX5035DASA/V+T

Manufacturer Part Number
MAX5035DASA/V+T
Description
IC DC/DC CONV STP-DWN 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX5035AUSA.pdf (17 pages)

Specifications of MAX5035DASA/V+T

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.25 ~ 13.2 V
Current - Output
1A
Frequency - Switching
125kHz
Voltage - Input
7.5 ~ 76 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Power - Output
471mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 270μA 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. The out-
put current may be limited by the maximum power dis-
sipation capability of the package. 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
automotive (-40°C to +125°C) temperature range.
19-2988; Rev 4; 4/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
7.5V TO 76V
OFF
Automotive
Consumer Electronics
Industrial
Distributed Power
V
68μF
IN
ON
R1
R2
Typical Operating Circuit
ON/OFF
________________________________________________________________ Maxim Integrated Products
V
SGND
IN
MAX5035
General Description
GND
BST
VD
LX
FB
1A, 76V, High-Efficiency MAXPower
0.1μF
0.1μF
Applications
D1
50SQ100
100μH
Step-Down DC-DC Converter
68μF
V
5V
OUT
♦ Wide 7.5V to 76V Input Voltage Range
♦ Fixed (3.3V, 5V, 12V) and Adjustable
♦ 1A Output Current
♦ Efficiency Up to 94%
♦ Internal 0.4Ω High-Side DMOS FET
♦ 270µA Quiescent Current at No Load, 10µA
♦ Internal Frequency Compensation
♦ Fixed 125kHz Switching Frequency
♦ Thermal Shutdown and Short-Circuit Current
♦ 8-Pin SO and PDIP Packages
+ Denotes lead(Pb)-free/RoHS-compliant package.
Ordering Information continued at end of data sheet.
MAX5035AUSA
MAX5035AUPA
MAX5035AASA
MAX5035BUSA
MAX5035BUPA
MAX5035BASA
M AX 5035AAS A/V + -40°C to +125°C 8 SO
M AX 5035BAS A/V + -40°C to +125°C 8 SO
(1.25V to 13.2V) Versions
Shutdown Current
Limit
TOP VIEW
PART
SGND
BST
VD
FB
-40°C to +125°C 8 SO
-40°C to +125°C 8 SO
TEMP RANGE
0°C to +85°C
0°C to +85°C
0°C to +85°C
0°C to +85°C
1
2
3
4
Ordering Information
MAX5035
SO/PDIP
Pin Configuration
PIN-
PACKAGE
8 SO
8 PDIP
8 SO
8 PDIP
8
7
6
5
LX
V
GND
ON/OFF
Features
IN
VO LTA GE
OU TPU T
3.3
5.0
( V)
1

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MAX5035DASA/V+T Summary of contents

Page 1

... VD OFF SGND GND 0.1μF ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Step-Down DC-DC Converter ♦ Wide 7.5V to 76V Input Voltage Range ♦ Fixed (3.3V, 5V, 12V) and Adjustable (1.25V to 13.2V) Versions ♦ ...

Page 2

High-Efficiency MAXPower Step-Down DC-DC Converter ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND, unless otherwise specified.) V .........................................................................-0.3V to +80V IN SGND ....................................................................-0.3V to +0.3V LX.................................................................-0. BST ...............................................................-0. BST (transient < 100ns) ................................-0. ...

Page 3

High-Efficiency MAXPower ELECTRICAL CHARACTERISTICS (continued) (MAX5035_U_ +12V +12V ON/OFF OUT Typical Application Circuit. ) PARAMETER SYMBOL PFM Threshold FB Input Bias Current ON/OFF CONTROL INPUT ON/OFF Input-Voltage Threshold ...

Page 4

High-Efficiency MAXPower Step-Down DC-DC Converter ELECTRICAL CHARACTERISTICS (MAX5035_A_ _) (continued +12V +12V ON/OFF OUT the Typical Application Circuit. ) (Note 2) PARAMETER SYMBOL Efficiency Quiescent Supply Current Shutdown Current ...

Page 5

High-Efficiency MAXPower (V = 12V 12V -40°C to +125°C, unless otherwise noted. Typical values are ON/OFF A Application Circuit , if applicable.) V vs. TEMPERATURE OUT (MAX5035AASA 3.3V) OUT ...

Page 6

High-Efficiency MAXPower Step-Down DC-DC Converter (V = 12V 12V -40°C to +125°C, unless otherwise noted. Typical values are ON/OFF A Application Circuit , if applicable.) EFFICIENCY vs. LOAD CURRENT (MAX5035AASA, V ...

Page 7

High-Efficiency MAXPower (V = 12V 12V -40°C to +125°C, unless otherwise noted. Typical values are ON/OFF A Application Circuit , if applicable.) OUTPUT VOLTAGE vs. INPUT VOLTAGE 15 MAX5035DASA V = ...

Page 8

High-Efficiency MAXPower Step-Down DC-DC Converter (V = 12V 12V -40°C to +125°C, unless otherwise noted. Typical values are ON/OFF A Application Circuit , if applicable.) MAX5035DASA LX WAVEFORMS 4μs/div A: SWITCH ...

Page 9

High-Efficiency MAXPower PIN NAME 1 BST Boost Capacitor Connection. Connect a 0.1μF ceramic capacitor from BST to LX Internal Regulator Output. Bypass VD to GND with a 0.1μF ceramic capacitor. 3 SGND Internal Connection. SGND must ...

Page 10

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 feed-forward and an internal switching DMOS FET provides high ...

Page 11

High-Efficiency MAXPower The MAX5035 features internal compensation for opti- mum closed-loop bandwidth and phase margin. With the preset compensation strongly advised to sense the output immediately after the primary LC. Inductor Selection The choice of an ...

Page 12

High-Efficiency MAXPower Step-Down DC-DC Converter Ensure that the ripple specification of the input capaci- tor exceeds the worst-case capacitor RMS ripple cur- rent. Use the following equations to calculate the input capacitor RMS current − I ...

Page 13

High-Efficiency MAXPower ground configuration). A ground plane is required. Minimize lead lengths to reduce stray capacitance, trace resistance, and radiated noise. In particular, place the Schottky rectifier diode right next to the Figure 2. ...

Page 14

High-Efficiency MAXPower Step-Down DC-DC Converter Table 2. Typical External Components Selection (Circuit of Figure 2) (continued) V (V) V (V) IN OUT 3 3 ______________________________________________________________________________________ I (A) EXTERNAL ...

Page 15

High-Efficiency MAXPower Table 3. Component Suppliers SUPPLIER AVX Coilcraft Diodes Incorporated Panasonic SANYO TDK Vishay V IN 12V C IN 68μF *LOCATE PTC AS CLOSE TO HEAT-DISSIPATING COMPONENTS AS POSSIBLE. Figure 3. Load Temperature Monitoring with ON/OFF (Requires ...

Page 16

High-Efficiency MAXPower Step-Down DC-DC Converter V IN 7.5V TO 36V C IN 68μ 68μF Figure 4. Dual-Sequenced DC-DC Converters (Startup Delay Determined by R1/R1’, Ct/Ct’ and Rt/Rt’) Ordering Information (continued) PART TEMP RANGE MAX5035CUSA 0°C to ...

Page 17

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2010 Maxim Integrated Products ...

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