Datasheet MAX1836, MAX1837 (Maxim)
| 制造商 | Maxim |
| 描述 | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters |
| 页数 / 页 | 15 / 1 — EVALUATION KIT AVAILABLE. MAX1836/MAX1837. 24V Internal Switch, 100% Duty … |
| 文件格式/大小 | PDF / 2.1 Mb |
| 文件语言 | 英语 |
EVALUATION KIT AVAILABLE. MAX1836/MAX1837. 24V Internal Switch, 100% Duty Cycle,. Step-Down Converters. General Description
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EVALUATION KIT AVAILABLE MAX1836/MAX1837 24V Internal Switch, 100% Duty Cycle, Step-Down Converters General Description Features
The MAX1836/MAX1837 high-efficiency step-down con- ● 4.5V to 24V Input Voltage Range verters provide a preset 3.3V or 5V output voltage from ● Preset 3.3V or 5V Output supply voltages as high as 24V. Using external feedback resistors, the output voltage can be adjusted from 1.25V ● Adjustable Output from 1.25V to VIN to VIN. An internal current-limited switching MOSFET ● Output Currents Up to 125mA (MAX1836) or delivers load currents up to 125mA (MAX1836) or 250mA 250mA (MAX1837) (MAX1837). ● Efficiency Over 90% The unique current-limited control scheme, operating ● 12μA Quiescent Current with duty cycles up to 100%, minimizes the dropout volt- age (120mV at 100mA). Additionally, this control scheme ● 3μA Shutdown Current reduces supply current under light loads to 12μA. High ● 100% Maximum Duty Cycle for Low Dropout switching frequencies allow the use of tiny surface-mount ● Small 6-Pin SOT23 and TDFN Packages inductors and output capacitors. The MAX1836/MAX1837 step-down converters with inter-
Ordering Information
nal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal
PART TEMP RANGE PIN- TOP
for low-cost, low-power, space-sensitive applications.
PACKAGE MARK
For increased output drive capability, use the MAX1776
MAX1836
ETT33-T -40°C to +85°C 6 TDFN-EP* AJG step-down converter that uses an internal 24V switch to MAX1836ETT50-T -40°C to +85°C 6 TDFN-EP* AJE deliver up to 500mA. For even higher currents, use the MAX1836EUT33-T -40°C to +85°C 6 SOT23 AANY MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W. MAX1836EUT50-T -40°C to +85°C 6 SOT23 AANW
MAX1837
ETT33-T -40°C to +85°C 6 TDFN-EP* AJH
Applications
MAX1837ETT50-T -40°C to +85°C 6 TDFN-EP* AJF ● 9V Battery Systems MAX1837EUT33-T -40°C to +85°C 6 SOT23 AANZ ● Notebook Computers ● Distributed Power Systems MAX1837EUT50-T -40°C to +85°C 6 SOT23 AANX ● Backup Supplies *EP = Exposed pad. ● 4mA to 20mA Loop Power Supplies T = Tape and reel. ● Industrial Control Supplies
Selector Guide appears at end of data sheet.
● Handheld Devices
Typical Operating Circuit Pin Configurations
INPUT OUTPUT TOP VIEW 4.5V TO 24V 3.3V OR 5V IN LX SHDN FB 1 6 OUT FB 1 6 OUT
MAX1836 MAX1837 MAX1836
OUT
MAX1836
GND 2
MAX1837
5 SHDN GND 2 5 SHDN
MAX1837
IN 3 4 LX GND FB IN 3 4 LX
TDFN NOTE:
HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.
SOT23
19-1919; Rev 3; 7/06
The MAX1836/MAX1837 high-efficiency step-down con- ● 4.5V to 24V Input Voltage Range verters provide a preset 3.3V or 5V output voltage from ● Preset 3.3V or 5V Output supply voltages as high as 24V. Using external feedback resistors, the output voltage can be adjusted from 1.25V ● Adjustable Output from 1.25V to VIN to VIN. An internal current-limited switching MOSFET ● Output Currents Up to 125mA (MAX1836) or delivers load currents up to 125mA (MAX1836) or 250mA 250mA (MAX1837) (MAX1837). ● Efficiency Over 90% The unique current-limited control scheme, operating ● 12μA Quiescent Current with duty cycles up to 100%, minimizes the dropout volt- age (120mV at 100mA). Additionally, this control scheme ● 3μA Shutdown Current reduces supply current under light loads to 12μA. High ● 100% Maximum Duty Cycle for Low Dropout switching frequencies allow the use of tiny surface-mount ● Small 6-Pin SOT23 and TDFN Packages inductors and output capacitors. The MAX1836/MAX1837 step-down converters with inter-
Ordering Information
nal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal
PART TEMP RANGE PIN- TOP
for low-cost, low-power, space-sensitive applications.
PACKAGE MARK
For increased output drive capability, use the MAX1776
MAX1836
ETT33-T -40°C to +85°C 6 TDFN-EP* AJG step-down converter that uses an internal 24V switch to MAX1836ETT50-T -40°C to +85°C 6 TDFN-EP* AJE deliver up to 500mA. For even higher currents, use the MAX1836EUT33-T -40°C to +85°C 6 SOT23 AANY MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W. MAX1836EUT50-T -40°C to +85°C 6 SOT23 AANW
MAX1837
ETT33-T -40°C to +85°C 6 TDFN-EP* AJH
Applications
MAX1837ETT50-T -40°C to +85°C 6 TDFN-EP* AJF ● 9V Battery Systems MAX1837EUT33-T -40°C to +85°C 6 SOT23 AANZ ● Notebook Computers ● Distributed Power Systems MAX1837EUT50-T -40°C to +85°C 6 SOT23 AANX ● Backup Supplies *EP = Exposed pad. ● 4mA to 20mA Loop Power Supplies T = Tape and reel. ● Industrial Control Supplies
Selector Guide appears at end of data sheet.
● Handheld Devices
Typical Operating Circuit Pin Configurations
INPUT OUTPUT TOP VIEW 4.5V TO 24V 3.3V OR 5V IN LX SHDN FB 1 6 OUT FB 1 6 OUT
MAX1836 MAX1837 MAX1836
OUT
MAX1836
GND 2
MAX1837
5 SHDN GND 2 5 SHDN
MAX1837
IN 3 4 LX GND FB IN 3 4 LX
TDFN NOTE:
HIGH-CURRENT PATHS SHOWN WITH BOLD LINES.
SOT23
19-1919; Rev 3; 7/06