MAX845
MAX845
PRODUCTIONIsolated Transformer Driver for PCMCIA Applications
Internal Power MOSFETs Save Space and Deliver 750mW
- Part Models
- 5
- 1ku List Price
- Starting From $3.87
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Overview
- Transformer Driver for Ultra-Thin 5V-µs Transformers
- Isolated DC-to-DC Power Supply for PCMCIA Applications
- 450kHz Minimum Switching Frequency
- Ultra-Low Input Supply Current Ripple
- Single +5V or +3.3V Supply
- 5µW Low-Power Shutdown Mode
- 8-Pin SO and µMAX Packages
- Low Output Ripple Permits Miniature Output Capacitors
The MAX845 provides an isolated power supply small enough to fit in thin PCMCIA cards and space-sensitive applications. It drives a low-profile center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated positive or negative voltage at powers up to 750mW.
The MAX845 consists of an oscillator followed by a toggle flip-flop. The flip-flop generates two 50% duty-cycle square waves, which are complementary at half the oscillator frequency (450kHz, min). These two signals drive the ground-referenced N-channel power switches. Internal circuitry ensures break-before-make action between the two switches.
A low-power shutdown disables both the switches and the oscillator, reducing power consumption. An evaluation kit (MAX845EVKIT-MM) is available to evaluate low-profile 5V 40mA and 5V 100mA applications.
Applications
- Bridge Ground Differentials
- Isolated Data Acquisition
- Isolated Interface Power Supply
- Low-Power LAN Networks
- Medical Equipment
- Noise-Immunity Communications Interface
- PCMCIA Modem Cards
- Process Control
Documentation
Data Sheet 1
Design Note 6
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX845C/D | DIE | ||
| MAX845ESA+ | Small-Outline IC Narrow (0.15in) | ||
| MAX845ESA+T | Small-Outline IC Narrow (0.15in) | ||
| MAX845EUA+ | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX845EUA+T | Micro-MAX, Thin Shrink Small-Outline |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 30, 2020 - 1702R2 ASSEMBLY |
||
| MAX845ESA+ | PRODUCTION | |
| MAX845ESA+T | PRODUCTION | |
|
Apr 20, 2026 - 2571A PIN/ERRATA |
||
| MAX845ESA+T | PRODUCTION | |
|
Apr 20, 2026 - 2571B PIN/ERRATA |
||
| MAX845EUA+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareEvaluation Kits
Evaluation Kit for the MAX845