MAX1837EUT33-T Maxim Integrated Products, MAX1837EUT33-T Datasheet
MAX1837EUT33-T
Specifications of MAX1837EUT33-T
Available stocks
Related parts for MAX1837EUT33-T
MAX1837EUT33-T Summary of contents
Page 1
... MAX1836ETT50-T -40°C to +85°C MAX1836EUT33-T -40°C to +85°C MAX1836EUT50-T -40°C to +85°C MAX1837ETT33-T -40°C to +85°C MAX1837ETT50-T -40°C to +85°C MAX1837EUT33-T -40°C to +85°C MAX1837EUT50-T -40°C to +85°C *EP = Exposed pad. Selector Guide appears at end of data sheet. OUTPUT TOP VIEW 3. ...
Page 2
... OFF( M IN) LX Switch Maximum On-Time Switch On-Resistance LX Current Limit LX Zero-Crossing Threshold Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 _______________________________________________________________________________________ Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C + 0.3V) IN Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C ...
Page 3
Internal Switch, 100% Duty Cycle, ELECTRICAL CHARACTERISTICS (continued) (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V unless otherwise noted.) PARAMETER SYMBOL Zero-Crossing Timeout LX Switch Leakage Current Dropout Voltage V DROPOUT Line Regulation Load Regulation Shutdown Input Threshold ...
Page 4
... OUTPUT VOLTAGE vs. LOAD CURRENT 3.33 FIGURE 12V IN 3.29 3.28 3.27 1000 0 50 100 150 200 LOAD CURRENT (mA) MAX1837EUT33 OUTPUT VOLTAGE vs. INPUT VOLTAGE 3.33 I OUT 3.32 3.31 I OUT 3.30 3.29 FIGURE 2 3. 3.3V OUT L1 = 47µH 3.27 300 350 INPUT VOLTAGE (V) ...
Page 5
... INPUT VOLTAGE (V) 100 FIGURE 6 V OUT = 150 200 250 300 0 200 300 0 MAX1837EUT33 PEAK INDUCTOR CURRENT vs. INPUT VOLTAGE 1000 FIGURE 3.3V OUT I OUT L1 = 47µH 800 I 600 = 3.3V 400 200 = 10mA LIMITED BY LIMITED ON(MIN) LIM INPUT VOLTAGE (V) MAX1837EUT50 EFFICIENCY vs. LOAD CURRENT ...
Page 6
Internal Switch, 100% Duty Cycle, Step-Down Converters (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V MAX1837EUT50 LOAD TRANSIENT 400mA 200mA 0 5.02V 5.00V 4.98V 750mA 250mA 0 100µs/div 10mA to 250mA, 200mA/div OUT B: V ...
Page 7
Internal Switch, 100% Duty Cycle, PIN NAME Dual-Mode Feedback Input. Connect to GND for the preset 3.3V (MAX183_EUT33) or 5.0V (MAX183_EUT50) output. Connect to a resistive divider between the output and FB to adjust the output voltage between 1.25V ...
Page 8
Internal Switch, 100% Duty Cycle, Step-Down Converters INPUT 4.5V OR 24V SHDN R S MAX1836 MAX1837 Figure 3. Functional Diagram When the output voltage is too low, an error comparator sets a flip-flop, which turns on ...
Page 9
Internal Switch, 100% Duty Cycle, Input-Output (Dropout) Voltage A step-down converter’s minimum input-to-output volt- age differential (dropout voltage) determines the lowest useable input supply voltage. In battery-powered sys- tems, this limits the useful end-of-life battery voltage. To maximize battery ...
Page 10
Internal Switch, 100% Duty Cycle, Step-Down Converters The inductor’s saturation current rating must be greater than the peak switching current, which is determined by the switch current limit plus the overshoot due to the 300ns current-sense comparator propagation delay: ...
Page 11
Internal Switch, 100% Duty Cycle, Table 1. Component Suppliers SUPPLIER INDUCTORS Coilcraft Coiltronics Sumida USA Toko CAPACITORS AVX Kemet Panasonic Sanyo Taiyo Yuden DIODES Central Semiconductor International Nihon On Semiconductor Zetex MAX1836/MAX1837 Stability Commonly, instability is caused by excessive ...
Page 12
... D1 = NIHON EP05Q03L NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES. Figure 6. High-Voltage Application Selector Guide PRESET OUTPUT PART VOLTAGE (V) MAX1836ETT33 3.3 MAX1836ETT50 5 MAX1836EUT33 3.3 MAX1836EUT50 5 MAX1837ETT33 3.3 MAX1837ETT50 5 MAX1837EUT33 3.3 MAX1837EUT50 5 12 ______________________________________________________________________________________ L1 OUTPUT INPUT 47µH 5V 3.6V TO 18V C C OUT IN D1 68µF 10µF 10V NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES ...
Page 13
Internal Switch, 100% Duty Cycle, (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Step-Down Converters Package Information PACKAGE OUTLINE, SOT 6L BODY 21-0058 ...
Page 14
Internal Switch, 100% Duty Cycle, Step-Down Converters (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 14 ______________________________________________________________________________________ Package Information (continued) PACKAGE OUTLINE, 6,8,10 & ...
Page 15
... 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 ____________________ 15 © 2006 Maxim Integrated Products ...