Product Details
Key Features
Applications/Uses
VIN (V) (min) | 2.7 |
VIN (V) (max) | 14 |
VOUT1 (V) (min) | 1.25 |
VOUT1 (V) (max) | 14 |
IOUT1 (A) (max) | 1 |
Switch Type | Internal |
Preset VOUT (V) | 3.3 |
Output Adjust. Method | Preset Resistor |
# DC-DC Outputs | 1 |
Switching Frequency (kHz) | 300 |
Package/Pins | QSOP/16 |
Budgetary Price (See Notes) | 4.18 |
Simplified Block Diagram
Technical Docs
Data Sheet | Low-Noise, 14V Input, 1A, PWM Step-Down Converters | May 29, 2002 | |
App Note | Protection From Blackouts: Dirt Cheap to Fully Integrated | ||
App Note | Chip Recorder Customizes Phone Ringer |
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 .
Sampling:
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Parameters
VIN (V) (min) | 2.7 |
VIN (V) (max) | 14 |
VOUT1 (V) (min) | 1.25 |
VOUT1 (V) (max) | 14 |
IOUT1 (A) (max) | 1 |
Switch Type | Internal |
Preset VOUT (V) | 3.3 |
Output Adjust. Method | Preset Resistor |
# DC-DC Outputs | 1 |
Switching Frequency (kHz) | 300 |
Package/Pins | QSOP/16 |
Budgetary Price (See Notes) | 4.18 |
Key Features
- Up to 96% Efficiency
- 1A Guaranteed Output Current
- 100% Duty Cycle in Dropout
- 2.7V to 14V Input Range (15V Absolute Max)
- ±1% Accurate Reference Output
- 0.24Ω P-Channel On-Resistance
- Synchronizable Switching Frequency
- Fixed-Frequency PWM Operation
- 300kHz (MAX1684)
- 600kHz (MAX1685)
- 150µA Normal-Mode Quiescent Current
- 25µA Low-Power Mode Quiescent Current
- 2µA Shutdown Current
- Dual Mode Fixed 3.3V (±1%) Output or Adjustable Output (1.25V to VIN)
- Small 16-QSOP Package
- Auxiliary Output (CVL): 3V/5mA
Applications/Uses
- Cell Phones
- Computer Peripherals
- PDAs and Handy-Terminals
- Personal Communicators
- Two-Way Radios and Walkie-Talkies
Description
The low on-resistance power switch and built-in synchronous rectifier provide high efficiencies of up to 96%. There are four modes of operation: fixed-frequency, normal, low-power, and shutdown. The fixed-frequency PWM mode of operation offers excellent noise characteristics. The normal mode maintains high efficiency at all loads. The low-power mode is used to conserve power in standby or when full load is not required. The shutdown mode is used to power down the device for minimal current draw.
The MAX1684 runs at 300kHz for applications that require highest efficiency. The MAX1685 runs at 600kHz to allow the use of smaller external components. These devices can also be synchronized to an external clock. Other features include a 100% duty cycle for low-dropout applications, an auxiliary 3V/5mA output, and a 1% accurate reference.
Both devices are available in a space-saving 16-QSOP package. An evaluation kit is also available to help speed designs. For a similar device in a 10-pin µMAX® package with lower input voltage requirements (5.5V max), refer to the MAX1692 data sheet.
Technical Docs
Data Sheet | Low-Noise, 14V Input, 1A, PWM Step-Down Converters | May 29, 2002 | |
App Note | Protection From Blackouts: Dirt Cheap to Fully Integrated | ||
App Note | Chip Recorder Customizes Phone Ringer |
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 .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.