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Switching Regulator - Switching Regulators 
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MAX757
3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters
For New Designs, We Recommend Improved Performance Devices, MAX1674/MAX1675/MAX1676
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Key Features
Applications/Uses
Parametric specs for Step-Up Switching Regulators
| VIN (V) (min) | 0.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 2.7 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 0.3 |
| Switch Type | Internal |
| Output Adjust. Method | Resistor |
| Power Good Signal | Yes |
| Shutdown Mode Supply Current (µA) (typ) | 0.02 |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 500 |
| Package/Pins | PDIP/8 SOIC (N)/8 |
| Budgetary Price (See Notes) | 2.29 |
Simplified Block Diagram
Technical Docs
| Data Sheet | 3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters | Jan 01, 1995 |
Support & Training
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Parameters
Parametric specs for Step-Up Switching Regulators
| VIN (V) (min) | 0.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 2.7 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 0.3 |
| Switch Type | Internal |
| Output Adjust. Method | Resistor |
| Power Good Signal | Yes |
| Shutdown Mode Supply Current (µA) (typ) | 0.02 |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 500 |
| Package/Pins | PDIP/8 SOIC (N)/8 |
| Budgetary Price (See Notes) | 2.29 |
Key Features
- Operates Down to 0.7V Input Supply Voltage
- 87% Efficiency at 200mA
- 60µA Quiescent Current
- 20µA Shutdown Mode with Active Reference and LBI Detector
- 500kHz Maximum Switching Frequency
- ±1.5% Reference Tolerance Over Temperature
- Low-Battery Detector (LBI/LBO)
- 8-Pin DIP and SO Packages
Applications/Uses
- 2-Cell and 3-Cell Battery-Operated Equipment
- 3.3V to 5V Step-Up Conversion
- Glucose Meters
- Medical Instrumentation
- Palmtop Computers
- Personal Data Communicators/Computers
- Portable Data-Collection Equipment
Description
The MAX756/MAX757 are CMOS step-up DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX756 accepts a positive input voltage down to 0.7V and converts it to a higher pin-selectable output voltage of 3.3V or 5V. The MAX757 is an adjustable version that accepts an input voltage down to 0.7V and generates a higher adjustable output voltage in the range from 2.7V to 5.5V. Typical full-load efficiencies for the MAX756/MAX757 are greater than 87%.
The MAX756/MAX757 provide three improvements over previous devices. Physical size is reduced-the high switching frequencies (up to 0.5MHz) made possible by MOSFET power transistors allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is improved to 87% (10% better than with low-voltage regulators fabricated in bipolar technology). Supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation control scheme.
The MAX756/MAX757 provide three improvements over previous devices. Physical size is reduced-the high switching frequencies (up to 0.5MHz) made possible by MOSFET power transistors allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is improved to 87% (10% better than with low-voltage regulators fabricated in bipolar technology). Supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation control scheme.
Technical Docs
| Data Sheet | 3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters | Jan 01, 1995 |
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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