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Switching Regulator - Switching Regulators 
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Key Features
Applications/Uses
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 24 |
| VOUT1 (V) (min) | 1.25 |
| VOUT1 (V) (max) | 24 |
| IOUT1 (A) (max) | 0.25 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 200 |
| Design Tools | EE-Sim |
| Package/Pins | SOT23/6 TDFN/6 |
| Budgetary Price (See Notes) | 2.3 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters | Aug 10, 2006 |
Support & Training
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Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 24 |
| VOUT1 (V) (min) | 1.25 |
| VOUT1 (V) (max) | 24 |
| IOUT1 (A) (max) | 0.25 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 200 |
| Design Tools | generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=7681', '') |
| Package/Pins | SOT23/6 TDFN/6 |
| Budgetary Price (See Notes) | 2.3 |
Key Features
- 4.5V to 24V Input Voltage Range
- Preset 3.3V or 5V Output
- Adjustable Output from 1.25V to VIN
- Output Currents Up to 125mA (MAX1836) or 250mA (MAX1837)
- Efficiency Over 90%
- 12µA Quiescent Current
- 3µA Shutdown Current
- 100% Maximum Duty Cycle for Low Dropout
- Small 6-Pin SOT23 and TDFN Packages
Applications/Uses
- 4mA to 20mA Loop Power Supplies
- 9V Battery Systems
- Backup Supplies
- Distributed Power Systems
- Handheld Devices
- Industrial Control Supplies
- Notebook Computers
Description
The MAX1836/MAX1837 high-efficiency step-down converters provide a preset 3.3V or 5V output voltage from supply voltages as high as 24V. Using external feedback resistors, the output voltage can be adjusted from 1.25V to VIN. An internal current-limited switching MOSFET delivers load currents up to 125mA (MAX1836) or 250mA (MAX1837).
The unique current-limited control scheme, operating with duty cycles up to 100%, minimizes the dropout voltage (120mV at 100mA). Additionally, this control scheme reduces supply current under light loads to 12µA. High switching frequencies allow the use of tiny surface-mount inductors and output capacitors.
The MAX1836/MAX1837 step-down converters with internal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal for low-cost, low-power, space-sensitive applications. For increased output drive capability, use the MAX1776 step-down converter that uses an internal 24V switch to deliver up to 500mA. For even higher currents, use the MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W.
The unique current-limited control scheme, operating with duty cycles up to 100%, minimizes the dropout voltage (120mV at 100mA). Additionally, this control scheme reduces supply current under light loads to 12µA. High switching frequencies allow the use of tiny surface-mount inductors and output capacitors.
The MAX1836/MAX1837 step-down converters with internal switching MOSFETs are available in 6-pin SOT23 and 3mm x 3mm TDFN packages, making them ideal for low-cost, low-power, space-sensitive applications. For increased output drive capability, use the MAX1776 step-down converter that uses an internal 24V switch to deliver up to 500mA. For even higher currents, use the MAX1626/MAX1627 step-down controllers that drive an external P-channel MOSFET to deliver up to 20W.
Technical Docs
| Data Sheet | 24V Internal Switch, 100% Duty Cycle, Step-Down Converters | Aug 10, 2006 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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