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Description
MAXIM INTEGRATED PRODUCTS MAX1709EUI+ DC-DC Switching Boost (Step Up) Regulator, Adj., 700mV-5Vin, 3.3V-5V/4A out, 600 kHz, TSSOP-28The MAX1709EUI+ is a 4A, high frequency, step up DC to DC converter in 28 pin TSSOP package. This low noise DC to DC converter delivers up to 20W at a fixed (3. 3V or 5V) or adjustable (2. 5V to 5. 5V) output, using an on chip power MOSFET from +0. 7V to +5V supply. Fixed frequency PWM operation ensures that the switching noise spectrum is constrained to 600KHz fundamental and its harmonics allowing easy postfiltering for noise reduction. External
The MAX1709EUI+ is a 4A, high frequency, step-up DC to DC converter in 28 pin TSSOP package. This low noise DC to DC converter delivers up to 20W at a fixed (3.3V or 5V) or adjustable (2.5V to 5.5V) output, using an on-chip power MOSFET from +0.7V to +5V supply. Fixed frequency PWM operation ensures that the switching noise spectrum is constrained to 600KHz fundamental and its harmonics allowing easy postfiltering for noise reduction. External clock synchronization capability allows for even tighter noise spectrum control. Two control inputs (ONA, ONB (complementary)) allow simple push-on, push-off control through a single momentary pushbutton switch as well as conventional on/off logic control. It features programmable soft-start and current limit for design flexibility and optimum performance with batteries. It is used in local 2.5V to 3.3V or 5V conversion, local 3.3V to 5V conversion, 3.6V or 5V RF PAs in communications handsets, routers, servers, workstations and card racks.
- Integration reduces external component count to save space
- On-chip 10A power MOSFET
- 5V, 4A output from a 3.3V input
- Fixed 3.3V or 5V output voltage or adjustable (2.5V to 5.5V)
- Constant frequency reduces post-filtering, synchronized switching frequency (350KHz to 1000KHz)
- Lower power consumption extends battery life
- Quiescent power consumption is less than 1mW
- Internal oscillator frequency of 600KHz at VOUT = VCLK = +3.6V
- Maximum duty cycle of 94% at VOUT = VCLK = +3.6V
Applications
Power Management, Industrial
- :
- 5V
- :
- 4A
- :
- 1Outputs
- :
- 85°C
- :
- 28Pins
- :
- 5V
- :
- 3.3V
- :
- 700mV
- :
- -
- :
- Boost (Step Up)
- :
- -
- :
- TSSOP
- :
- 600kHz
- :
- Each
- :
- MSL 1 - Unlimited
Product details
| Input Voltage Max | 5V |
| Output Current | 4A |
| No. of Outputs | 1Outputs |
| Operating Temperature Max | 85°C |
| No. of Pins | 28Pins |
| Output Voltage Max | 5V |
| Output Voltage Min | 3.3V |
| Input Voltage Min | 700mV |
| Product Range | - |
| Topology | Boost (Step Up) |
| Automotive Qualification Standard | - |
| DC / DC Converter IC Case | TSSOP |
| Switching Frequency | 600kHz |
| Packaging | Each |
| MSL | MSL 1 - Unlimited |
Other details
| Brand | MAXIM INTEGRATED PRODUCTS |
| Part Number | MAX1709EUI+ |
| Quantity | Each |
| Technical Data Sheet EN |
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. Image is for illustrative purposes only. Please refer to product description.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.6 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 4
Solid Kids Sandals, Overpriced Like Most Kids Shoes 🌞
Size: 11 Little Kid, Color: Brown, Size: 11 Little Kid, Color: Brown
My son hasn’t worn these yet since it’s December in Indiana and sandals + snow obviously don’t mix. 😂 So this review is based on first impressions rather than long term wear.
That said, these seem wider than a lot of typical kids’ sandals, which I REALLY appreciate since we tend to have wider feet in our family. #hobbitfeet
The quality feels pretty decent overall. They’re described as lightweight, and while they’re not insanely lightweight, they do have enough weight to feel semi-sturdy and not flimsy or cheap. I like the style and color, and I think they’ll work well for my son once warmer weather hits.
My main complaint is the price. At just under $24 at the time of this review, it feels a little high for kids’ sandals and for what these are. I really feel like $20 MAX would make more sense. Kids shoes are almost always priced like adult shoes, even though they clearly use less material, and that’s hard for me to understand and wrap my mind around. Overall, these seem solid for daily wear, I just wish the price was a bit more reasonable and affordable.
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Reviewed in the United States on December 31, 2025
★★★★★ 5
Great basic and timeless design
Size: 12 Little Kid, Color: Brown
These sandals are a great find! They’re super easy to get on and off thanks to the Velcro straps, which is a huge win for little ones learning to be more independent. The fit is adjustable and secure, so they stay in place well during all kinds of play.
The cork-style footbed is comfortable and gives good support, and the overall design feels sturdy enough to handle everyday wear. They’re lightweight but still durable, and have held up really well so far.
They also have a classic, versatile look that goes with just about everything, perfect for summer outfits. Overall, a reliable, comfortable sandal that’s great for active kids. Would definitely buy again!
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Reviewed in the United States on April 24, 2026
★★★★★ 5
Great option for boys or girls
Size: 13 Little Kid, Color: Black, Size: 13 Little Kid, Color: Black
This is really more of a unisex option for a sandal. I have sandals that look like this, and both of my children have worn this style. I ordered these for my daughter, with the plan to pass them down to my son if they're not too worn when she outgrows them. The style is very minimalistic, so it goes with lots of outfits. All the straps are easily adjustable, so you can get a good fit. I would say the length is true to size, but the width is maybe a bit wide. Nevertheless, the adjustable straps really help them fit well. They feel really sturdy and I appreciate that the sole has cushion to it. My daughter has worn these every day since I got them out of the closet and they're holding up well.
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Reviewed in the United States on February 19, 2026
★★★★★ 5
Fast shipping
Size: 5 Big Kid, Color: Black
Good sandals, the kid just didn't want them. Fast shipping and easy returns!
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Reviewed in the United States on June 11, 2026
★★★★★ 5
Great shoes
Size: 6 Toddler, Color: Brown
Perfect for little ones
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Reviewed in the United States on May 28, 2026