MAX1837ETT33+T Maxim Integrated Products, MAX1837ETT33+T Datasheet
MAX1837ETT33+T
Specifications of MAX1837ETT33+T
Related parts for MAX1837ETT33+T
MAX1837ETT33+T Summary of contents
Page 1
... OUT MAX1836 MAX1837 GND FB NOTE: HIGH-CURRENT PATHS SHOWN WITH BOLD LINES. ________________________________________________________________ Maxim Integrated Products 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. Step-Down Converters ____________________________Features ♦ 4.5V to 24V Input Voltage Range ♦ Preset 3. Output ♦ ...
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
Internal Switch, 100% Duty Cycle, Step-Down Converters ELECTRICAL CHARACTERISTICS (continued) (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V PARAMETER SYMBOL LX Zero-Crossing Threshold Shutdown Input Threshold V Shutdown Leakage Current I Note 2: When using the shutdown input, ...
Page 5
Internal Switch, 100% Duty Cycle, (Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V MAX1837EUT33 EFFICIENCY vs. INPUT VOLTAGE 100 FIGURE 3.3V OUT 47µ 200mA OUT ...
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
Internal Switch, 100% Duty Cycle, Step-Down Converters INPUT 4.5V TO 24V SHDN 10µF 25V OUT MAX1837 GND TAIYO YUDEN TMK432BJ106KM SUMIDA CDRH5D28-470 C = SANYO POSCAP 10TPC68M OUT D1 ...
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 ...