MAX17634B
4.5V to 36V, 4.25A, High-Efficiency, Synchronous Step-Down DC-DC Converter
A High-Efficiency, High-Voltage, Synchronous Step-Down DC-DC Converter with Integrated MOSFETs
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Key Features
Applications/Uses
| VIN (V) (min) | 4.5 |
| VIN (V) (max) | 36 |
| VOUT1 (V) (min) | 5 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 4.25 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 400 2200 |
| Design Tools | EE-Sim |
| Package/Pins | TQFN-CU/20 |
| Budgetary Price (See Notes) | 1.46 |
Simplified Block Diagram
Technical Docs
| Data Sheet | 4.5V to 36V, 4.25A, High-Efficiency, Synchronous Step-Down DC-DC Converter | Dec 06, 2019 |
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) | 4.5 |
| VIN (V) (max) | 36 |
| VOUT1 (V) (min) | 5 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 4.25 |
| Switch Type | Internal |
| Preset VOUT (V) | 5 |
| Output Adjust. Method | Preset Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 400 2200 |
| Design Tools | generateDesignEESIMUrl('http://maxim.transim.com/pwm2/designreq/Index?partId=12322', '') |
| Package/Pins | TQFN-CU/20 |
| Budgetary Price (See Notes) | 1.46 |
Key Features
- Reduces External Components and Total Cost
- No Schottky–Synchronous Operation
- Internal Compensation Components
- All-Ceramic Capacitors, Compact Layout
- Reduces Number of DC-DC Regulators to Stock
- Wide 4.5V to 36V Input
- Adjustable Output Range from 0.9V up to 90% of VIN
- 400kHz to 2.2MHz Adjustable Frequency with External Synchronization
- Available in a 20-Pin, 4mm x 4mm TQFN Package
- Reduces Power Dissipation
- Peak Efficiency of 94%
- PFM and DCM Modes Enable Enhanced Light-Load Efficiency
- Auxiliary Bootstrap Supply (EXTVCC) for Improved Efficiency
- 2.8μA Shutdown Current
- Operates Reliably in Adverse Industrial Environments
- Hiccup-Mode Overload Protection
- Adjustable and Monotonic Startup with Prebiased Output Voltage
- Built-in Output-Voltage Monitoring with RESET (Active Low)
- Programmable EN/UVLO Threshold
- Overtemperature Protection
- High Industrial -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range
Applications/Uses
- Industrial Control Power Supplies
- General-Purpose Point-of-Load
- Distributed Supply Regulation
- Base Station Power Supplies
- Wall Transformer Regulation
- High-Voltage, Single-Board Systems
Description
The MAX17634x is a high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operating over an input-voltage range of 4.5V to 36V. It can deliver up to 4.25A current. The MAX17634 is available in three variants: MAX17634A, MAX17634B, and MAX17634C. The MAX17634A and MAX17634B are fixed 3.3V and fixed 5V output voltage parts, respectively. The MAX17634C is an adjustable output voltage (from 0.9V up to 90% of VIN) part. Built-in compensation across the output voltage range eliminates the need for external components.
The MAX17634x features peak-current-mode control architecture. The device can be operated in forced pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and lightload conditions. The MAX17634x offers a low minimum on time that allows high switching frequencies and a smaller solution size.
The feedback voltage regulation accuracy over -40°C to +125°C for the MAX17634x is ±1.3%.The device is available in a compact 20-pin (4mm x 4mm) TQFN package. Simulation models are available.
Technical Docs
| Data Sheet | 4.5V to 36V, 4.25A, High-Efficiency, Synchronous Step-Down DC-DC Converter | Dec 06, 2019 |
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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