MAX1675
High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters
Compact, Low-Cost, Low-Noise Design: Inductor Damping Switch Eliminates Ringing, Improves EMI
Maxim Confidential 
MyMaxim SubscriptionsProduct Details
The input voltage ranges from 0.7V to VOUT, where VOUT can be set from 2V to 5.5V. Start-up is guaranteed from 1.1V inputs. The MAX1674/MAX1675/MAX1676 have a preset, pin-selectable output for 5V or 3.3V. The outputs can also be adjusted to other voltages using two external resistors.
All three devices have a 0.3Ω N-channel MOSFET power switch. The MAX1674 has a 1A current limit. The MAX1675 has a 0.5A current limit, which permits the use of a smaller inductor. The MAX1676 comes in a 10-pin µMAX package and features an adjustable current limit and circuitry to reduce inductor ringing.
Key Features
- 94% Efficient at 200mA Output Current
- 16µA Quiescent Supply Current
- Internal Synchronous Rectifier (no external diode)
- 0.1µA Logic-Controlled Shutdown
- LBI/LBO Low-Battery Detector
- Selectable Current Limit for Reduced Ripple
- Low-Noise, Anti-Ringing Feature (MAX1676)
- 8-Pin and 10-Pin µMAX Packages
- Preassembled Evaluation Kit (MAX1676EVKIT)
Applications/Uses
- 1- to 3-Cell Handheld Devices
- Handheld Computers
- Medical Devices
- Pagers
- PDAs
- RF Tags
- Wireless Phones
| VIN (V) (min) | 0.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 2 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 0.3 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Power Good Signal | Yes |
| Synchronous Switching? | Yes |
| ICC (mA) (typ) | 0.016 |
| Shutdown Mode Supply Current (µA) (typ) | 0.1 |
| Shutdown Mode Supply Current (µA) (max) | 1 |
| # DC-DC Outputs | 1 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | $2.35 @1k |
Technical Docs
| Data Sheet | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters | Mar 01, 2000 | |
| Tutorial | Linear Regulators in Portable Applications |
Click any title below to view the detail page where available.
Description
The MAX1676 is a high-efficiency, step-up DC-DC converter for portable hand-held devices. It accepts a positive input voltage between 0.7V to 5.5V and converts it to a higher output voltage. The MAX1676 includes a damping circuit (at BATT) that suppresses inductor ringing to reduce electromagnetic interference (EMI).
The MAX1676 evaluation kit (EV kit) is a fully assembled and tested surface-mount printed circuit board. Three jumpers on the EV kit allow for easy access to the output voltage select, current limit, and shutdown features.
The output voltage is both adjustable and pin-selectable. A movable jumper selects either a 3.3V or 5.0V output, or it can be left open and a resistor network can be used to obtain a voltage in the 2V to 5.5V range. The inductor current limit is selectable for either 0.5A or 1.0A. In shutdown mode, the MAX1676 typically draws only 0.1µA.
Features
- Synchronous Rectification for Improved Efficiency
- Operates Down to 0.7V Input Supply Voltage
- No External Schottky Diode Required (for multicell applications)
- Selectable Current Limit (0.5A or 1.0A)
- Damping Circuit Reduces EMI
- 16µA Quiescent Current
- 0.1µA Typical Shutdown Current
- Low-Battery Detector (LBI/LBO)
- 10-Pin µMAX® Package
- Surface-Mount Construction
- Fully Assembled and Tested
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
Parameters
| VIN (V) (min) | 0.7 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 2 |
| VOUT1 (V) (max) | 5.5 |
| IOUT1 (A) (max) | 0.3 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Power Good Signal | Yes |
| Synchronous Switching? | Yes |
| ICC (mA) (typ) | 0.016 |
| Shutdown Mode Supply Current (µA) (typ) | 0.1 |
| Shutdown Mode Supply Current (µA) (max) | 1 |
| # DC-DC Outputs | 1 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | $2.35 @1k |
Key Features
- 94% Efficient at 200mA Output Current
- 16µA Quiescent Supply Current
- Internal Synchronous Rectifier (no external diode)
- 0.1µA Logic-Controlled Shutdown
- LBI/LBO Low-Battery Detector
- Selectable Current Limit for Reduced Ripple
- Low-Noise, Anti-Ringing Feature (MAX1676)
- 8-Pin and 10-Pin µMAX Packages
- Preassembled Evaluation Kit (MAX1676EVKIT)
Applications/Uses
- 1- to 3-Cell Handheld Devices
- Handheld Computers
- Medical Devices
- Pagers
- PDAs
- RF Tags
- Wireless Phones
Description
The input voltage ranges from 0.7V to VOUT, where VOUT can be set from 2V to 5.5V. Start-up is guaranteed from 1.1V inputs. The MAX1674/MAX1675/MAX1676 have a preset, pin-selectable output for 5V or 3.3V. The outputs can also be adjusted to other voltages using two external resistors.
All three devices have a 0.3Ω N-channel MOSFET power switch. The MAX1674 has a 1A current limit. The MAX1675 has a 0.5A current limit, which permits the use of a smaller inductor. The MAX1676 comes in a 10-pin µMAX package and features an adjustable current limit and circuitry to reduce inductor ringing.
Technical Docs
| Data Sheet | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters | Mar 01, 2000 | |
| Tutorial | Linear Regulators in Portable Applications |
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
Request a Quote