Datasheet

ManualsBrandsMaxim Integrated ManualsActive ComponentsPMIC - voltage regulators - DC DC switch controllers Tube

General Description

The MAX5033 easy-to-use, high-efficiency, high-voltage,

step-down DC-DC converter operates from an input volt-

age up to 76V and consumes only 270μA quiescent cur-

rent at no load. This pulse-width modulated (PWM) con-

verter operates at a fixed 125kHz switching frequency at

heavy loads, and automatically switches to pulseskipping

mode to provide low quiescent current and high efficiency

at light loads. The MAX5033 includes internal frequency

compensation simplifying circuit implementation. The

device uses an internal low-onresistance, 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 thermal shutdown.

The MAX5033 delivers up to 500mA output current. The

output current may be limited by the maximum power

dissipation capability of the package. External shutdown

is included, featuring 10μA (typ) shutdown current. The

MAX5033A/B/C versions have fixed output voltages of

3.3V, 5V, and 12V, respectively, while the MAX5033D fea-

tures an adjustable output voltage, from 1.25V to 13.2V.

The MAX5033 is available in space-saving 8-pin SO and

8-pin plastic DIP packages and operates over the auto-

motive (-40°C to +125°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) Voltage Versions

● 500mA Output Current

● Efficiency Up to 94%

● Internal 0.4Ω High-Side DMOS FET

● 270μA 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

This product is available in both leaded(Pb) and lead(Pb)-free

packages. To order the lead(Pb)-free package, add a + after

the part number.

PART TEMP RANGE

PIN-

PACKAGE

OUTPUT

VOLTAGE (V)

MAX5033AUSA 0°C to +85°C 8 SO

3.3MAX5033AUPA 0°C to +85°C 8 PDIP

MAX5033AASA -40°C to +125°C 8 SO

MAX5033BUSA 0°C to +85°C 8 SO

5.0MAX5033BUPA 0°C to +85°C 8 PDIP

MAX5033BASA -40°C to +125°C 8 SO

MAX5033CUSA 0°C to +85°C 8 SO

12MAX5033CUPA 0°C to +85°C 8 PDIP

MAX5033CASA -40°C to +125°C 8 SO

MAX5033DUSA 0°C to +85°C 8 SO

ADJMAX5033DUPA 0°C to +85°C 8 PDIP

MAX5033DASA -40°C to +125°C 8 SO

MAX5033

GND

BST

SGND

50SQ100

220µH

OUT

5V, 0.5A

7.5V TO 76V

47µF

0.1µF

33µF

OFF

ON/OFF

BST

SGND

GND

ON/OFF

MAX5033

SO/PDIP

Pin Conguration

MAX5033 500mA, 76V, High-Efficiency, MAXPower

Step-Down DC-DC Converter

19-2979; Rev 5; 4/14

Typical Application Circuit

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (17 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter General Description The MAX5033 easy-to-use, high-efficiency, high-voltage, step-down DC-DC converter operates from an input voltage up to 76V and consumes only 270μA quiescent current at no load.
PAGE 2
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Absolute Maximum Ratings (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.
PAGE 3
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Electrical Characteristics (MAX5033_U_ _) (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 Operating Circuit.) PARAMETER Switch On-Resistance PFM Threshold FB Input Bias Current SYMBOL RDS(ON) IPFM IB CONDITIONS MIN ISWITCH = 500mA Minimum switch current in any cycle TYP MAX UNITS 0.4 0.80 Ω 35 65 95 mA MAX5033D -150 +0.
PAGE 4
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Electrical Characteristics (MAX5033_A_ _) (continued) (VIN = +12V, VON/OFF = +12V, IOUT = 0, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. See the Typical Operating Circuit.
PAGE 5
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Typical Operating Characteristics (VIN = 12V, VON/OFF = 12V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. See the Typical Operating Circuit, if applicable.) 12.3 IOUT = 0.1A 5.05 12.3 5.00 VOUT (V) 12.1 12.0 12.4 12.2 IOUT = 0.1A VOUT (V) IOUT = 0.5A IOUT = 0.5A 4.95 11.9 25 0 4.
PAGE 6
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Typical Operating Characteristics (continued) (VIN = 12V, VON/OFF = 12V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. See the Typical Operating Circuit, if applicable.) 1.4 1.1 MAX5033BASA VOUT = 5V 5% DROP IN VOUT 0.8 16 36 46 56 66 240 -50 -25 25 0 75 50 260 230 200 100 125 150 MAX5033 toc12 290 6 16 26 36 46 56 INPUT VOLTAGE (V) SHUTDOWN CURRENT vs.
PAGE 7
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Typical Operating Characteristics (continued) (VIN = 12V, VON/OFF = 12V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. See the Typical Operating Circuit, if applicable.
PAGE 8
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Pin Description PIN NAME 1 BST Boost Capacitor Connection. Connect a 0.1μF ceramic capacitor from BST to LX. FUNCTION 2 VD Internal Regulator Output. Bypass VD to GND with a 0.1μF ceramic capacitor. 3 SGND 4 FB 5 ON/OFF 6 GND 7 VIN Input Voltage. Bypass VIN to GND with a low-ESR capacitor as close to the device as possible. 8 LX Source Connection of Internal High-Side Switch. Internal Connection.
PAGE 9
MAX5033 Detailed Description The MAX5033 step-down DC-DC converter operates from a 7.5V to 76V input voltage range. A unique voltage- mode control scheme with voltage feed-forward and an internal switching DMOS FET provides high efficiency over a wide input voltage range. This pulsewidth modulated converter operates at a fixed 125kHz switching frequency. The device also features automatic pulse-skipping mode to provide low quiescent current and high efficiency at light loads.
PAGE 10
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter The MAX5033 features internal compensation for optimum closed-loop bandwidth and phase margin. With the preset compensation, it is strongly advised to sense the output immediately after the primary LC. temperature rise and thermal shutdown. Use Table 1 to choose the proper rectifier at different input voltages and output current.
PAGE 11
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Ensure that the ripple specification of the input capacitor exceeds the worst-case capacitor RMS ripple current.
PAGE 12
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Application Circuit VIN CIN VIN BST MAX5033 R1 SGND L1 D1 VOUT COUT FB ON/OFF R2 0.1µF LX GND VD 0.1µF Figure 2. Fixed Output Voltages Table 2. Typical External Components Selection (Circuit of Figure 2) VIN (V) 7.5 to 76 7.5 to 76 15 to 76 VOUT (V) 3.3 5 12 www.maximintegrated.com IOUT (A) EXTERNAL COMPONENTS 0.5 CIN = 47μF, Panasonic, EEVFK2A470Q COUT = 47μF, Vishay Sprague, 594D476X_016C2T CBST = 0.
PAGE 13
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Table 2. Typical External Components Selection (Circuit of Figure 2) (continued) VIN (V) VOUT (V) 3.3 IOUT (A) 0.5 CIN = 100μF, Panasonic, EEVFK1E101P COUT = 47μF, Vishay Sprague, 594D476X_016C2T CBST = 0.1μF, 0805 R1 = 1MΩ ±1%, 0805 R2 = 274kΩ ±1%, 0805 D1 = B220/A, Diodes Incorporated L1 = 150μH, Coilcraft Inc., DO5022P-154 0.5 CIN = 100μF, Panasonic, EEVFK1E101P COUT = 33μF, Vishay Sprague, 594D336X_016C2T CBST = 0.
PAGE 14
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Table 3. Component Suppliers PHONE FAX AVX SUPPLIER 843-946-0238 843-626-3123 www.avxcorp.com Coilcraft 847-639-6400 847-639-1469 www.coilcraft.com Diodes Incorporated 805-446-4800 805-446-4850 www.diodes.com Nichicon 858-824-1515 858-824-1525 www.nichicon.com Panasonic 714-373-7366 714-737-7323 www.panasonic.com SANYO 619-661-6835 619-661-1055 www.sanyo.com TDK 847-803-6100 847-390-4405 www.component.
PAGE 15
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter MAX5033B R1 ON/OFF VIN 7.5V TO 36V BST 0.1µF VIN CIN 47µF Ct Rt FB L1 220µH LX VD SGND GND VOUT 5V AT 0.5A COUT 68µF D1 B240 0.1µF MAX5033A FB R1' ON/OFF VIN C'IN 68µF Ct' Rt' BST 0.1µF L1' 150µH LX SGND GND VD V'OUT 3.3V AT 0.5A D1' B240 C'OUT 68µF 0.1µF Figure 4. Dual-Sequenced DC-DC Converters (Startup Delay Determined by R1/R1’, Ct/Ct’ and Rt/Rt’) Chip Information PROCESS: BiCMOS www.maximintegrated.
PAGE 16
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 17
MAX5033 500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 9/03 Initial release 1 5/04 New product update 1–7, 10 2 6/04 Removed future product asterisk and made specification changes 1, 2, 3 3 1/07 Modified Absolute Maximum Ratings specifications 4 4/10 Corrected inconsistencies in Absolute Maximum Ratings and Electrical Characteristics table 5 4/14 No /V OPNs; removed Automotive reference in Applications se