MAX17502FATB+T - 60V, 1A Sync Step-Down DC-DC | Maxim/ADI
MPN: MAX17502FATB+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.44 | $4.44 |
| 10 | $3.99 | $39.90 |
| 100 | $3.55 | $355.00 |
| 500 | $3.1 | $1,550.00 |
| 1,000 | $2.75 | $2,750.00 |
MAX17502FATB+T Overview
A synchronous buck (step-down) DC-DC converter is a switching regulator that uses actively controlled high-side and low-side MOSFETs to convert a higher DC input voltage into a lower, regulated DC output voltage with significantly higher efficiency than a linear regulator. The MAX17502 belongs to the step-down regulator -> DC-DC converter -> power management IC -> semiconductor hierarchy, and is optimized for harsh industrial and automotive environments where wide input transients are common.
Key features include a wide 4.5 V to 60 V input range, integrated 180 mΩ high-side and 120 mΩ low-side MOSFETs, internal loop compensation, programmable soft-start, and a power-good (PGOOD) output for rail sequencing. The fixed 5 V output variant eliminates external feedback resistors, while the adjustable variant covers 0.9 V to 92% of VIN. Shutdown current drops below 1 µA for energy-saving standby modes.
The internal architecture combines a peak-current-mode controller with a precision reference and adaptive dead-time control, achieving up to 92% efficiency. The 600 kHz switching node allows the use of small ceramic input and output capacitors while keeping fundamental switching noise outside the AM band, which simplifies EMI filtering.
Typical applications include industrial 24 V and 48 V bus systems, point-of-load regulators after a PFC stage, distributed supply rails in factory automation, battery-powered portable instruments, HVAC controllers, and eMobility accessories. Designers choose this part when they need a tiny, fully synchronous 1 A regulator that tolerates automotive load-dump events.
When designing with this part, keep the input capacitor loop and the high-side MOSFET loop as short as possible to minimize switching-node ringing, and connect the exposed pad to a continuous ground copper plane to keep junction temperature within the 150 °C limit. For high VIN-to-VOUT ratios, derate output current to stay within the SOA shown in the manufacturer datasheet.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical PCB design notes that go beyond what the manufacturer datasheet alone provides, making component evaluation and sourcing faster for engineers.
Drop-in alternatives for MAX17502FATB+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX17502GATB+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX17502EATB+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX17502FATB+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX17502FATB+T Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) |
| Input Voltage Range | 4.5 V to 60 V |
| Output Voltage (Fixed Variant) | 5 V |
| Output Voltage (Adjustable Variant) | 0.9 V to 92% of VIN |
| Maximum Output Current | 1 A |
| Switching Frequency | 600 kHz |
| High-Side MOSFET RDS(on) | 180 mΩ |
| Low-Side MOSFET RDS(on) | 120 mΩ |
| Output Voltage Accuracy | ±1.7% over -40°C to +125°C |
| Shutdown Supply Current | < 1 µA |
| Operating Temperature Range | -40°C to +125°C |
| Package | 10-pin TDFN-EP, 3 mm x 2 mm |
| Mounting Type | Surface Mount |
| Control Mode | Peak Current Mode, internal compensation |
| RoHS Status | Compliant |
MAX17502FATB+T Pin Configuration
| Pin 1 | BST — Bootstrap capacitor connection for high-side driver |
| Pin 2 | IN — Input voltage supply (4.5 V to 60 V) |
| Pin 3 | EN/UVLO — Enable input / undervoltage lockout threshold setting |
| Pin 4 | NC — Not connected (per datasheet) |
| Pin 5 | RT/SYNC — Resistor-programmable switching frequency / external clock sync |
| Pin 6 | SS — Soft-start capacitor connection |
| Pin 7 | FB — Feedback input (no connect for fixed 5 V variant) |
| Pin 8 | PGOOD — Power-good open-drain output |
| Pin 9 | GND — Ground reference |
| Pin 10 | LX — Switching node to external inductor |
| Pin 11 | EP — Exposed pad - must be soldered to ground for thermal dissipation |
Typical Applications
MAX17502FATB+T is suitable for 7 applications: Industrial 24 V / 48 V Bus Point-of-Load, Automotive 12 V Accessory Power, Distributed POL After PFC Stage, Battery-Powered Portable Instruments, HVAC and Building Automation, E-Mobility Accessories and Chargers, Industrial Sensor and Transmitter Rails.
Industrial 24 V / 48 V Bus Point-of-Load
The MAX17502FATB+T's 4.5 V to 60 V input range directly accepts industrial 24 V and 48 V rails without front-end protection. At VIN = 24 V to VOUT = 5 V at 1 A, the synchronous topology delivers ~88% efficiency, dissipating only ~0.7 W versus ~19 W for a linear regulator. The internal 180 mΩ/120 mΩ MOSFETs and 600 kHz switching keep the BOM small, while the exposed pad grounds to a copper pour for thermal relief in PLCs, factory sensors, and motor-control auxiliary rails.
Recommended
Automotive 12 V Accessory Power
The MAX17502FATB+T handles 12 V automotive supplies with tolerance for 36 V load-dump transients, suiting infotainment, body controllers, and accessory-power outputs. The 60 V absolute-maximum VIN allows direct connection across cranking and load-dump events; place a TVS clamp upstream for ISO 7637-2 compliance. Synchronous rectification delivers ~92% peak efficiency at 12 VIN-to-5 VOUT, reducing thermal stress in enclosed dashboards versus LDO regulators that would burn 7 W at 1 A.
Recommended
Distributed POL After PFC Stage
After a power-factor-correction front end, the MAX17502FATB+T provides a clean 5 V/1 A point-of-load rail for downstream MCUs, sensors, and gate drivers. The 600 kHz switching frequency keeps fundamental noise outside the AM band, easing conducted-EMI filtering for EN 55011 / EN 55032 compliance. Internal compensation eliminates the compensation-network design step, accelerating time-to-prototype for AC-DC adapters and UPS systems.
Recommended
Battery-Powered Portable Instruments
Handheld test equipment benefits from the MAX17502FATB+T's < 1 µA shutdown current, extending battery life in standby. The wide 4.5 V to 60 V input range accommodates 1S- to 10S Li-ion packs (3.0 V-42 V) and even 48 V telecom backup rails. Fixed 5 V output simplifies USB-powered device chargers and portable oscilloscope front ends, while the 3 mm x 2 mm TDFN-EP footprint fits inside compact handheld housings with strict PCB-area budgets.
Recommended
HVAC and Building Automation
The MAX17502FATB+T's 60 V input and -40 °C to +125 °C operating range make it suitable for HVAC controllers, thermostats, and building-automation gateways that draw power from 24 VAC rectified rails. Internal compensation keeps the BOM tiny, ideal for high-volume cost-sensitive installations. Synchronous rectification reduces waste heat inside wall enclosures where ambient temperatures can rise above 60 °C in mechanical rooms.
Recommended
E-Mobility Accessories and Chargers
For e-bike, scooter, and personal-mobility chargers operating from 36 V/48 V battery packs, the MAX17502FATB+T provides regulated 5 V/1 A rails for status LEDs, Bluetooth modules, and microcontrollers. The 60 V maximum input tolerates fully charged 13S Li-ion packs (54.6 V) plus inductive transients. Synchronous buck efficiency preserves battery runtime during standby display updates.
Recommended
Industrial Sensor and Transmitter Rails
Loop-powered 4-20 mA transmitters and 24 V-powered industrial sensors benefit from the MAX17502FATB+T's small footprint and tolerance of wide input transients. The device powers 5 V sensor signal-conditioning ASICs and ADC references from 24 V plant-supply rails with high rejection of supply noise. Internal soft-start prevents inrush currents that could trip upstream fuse protection on long cable runs.
Recommended
Recommended Products Summary
Engineering reference data for MAX17502FATB+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX17502GATB+T | MAX17502EATB+T | MAX17502FATB+ |
|---|---|---|---|---|
| Package | 10-pin TDFN-EP, 3 mm x 2 mm | 10-pin TDFN-EP, 3 mm x 2 mm - same | 10-pin TDFN-EP, 3 mm x 2 mm - same | 10-pin TDFN-EP, 3 mm x 2 mm - same |
| Brand | Analog Devices / Maxim Integrated | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Output Voltage | 5 V fixed | 0.9 V to 92% VIN (adjustable) | 3.3 V fixed | 5 V fixed - same |
| Input Voltage Range | 4.5 V to 60 V | 4.5 V to 60 V - same | 4.5 V to 60 V - same | 4.5 V to 60 V - same |
| Output Current | 1 A | 1 A - same | 1 A - same | 1 A - same |
| Switching Frequency | 600 kHz | 600 kHz - same | 600 kHz - same | 600 kHz - same |
| High-Side MOSFET RDS(on) | 180 mΩ | 180 mΩ - same | 180 mΩ - same | 180 mΩ - same |
| Control Mode | Peak current mode, internal compensation | Peak current mode, internal compensation - same | Peak current mode, internal compensation - same | Peak current mode, internal compensation - same |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C - same | -40°C to +125°C - same | -40°C to +125°C - same |
Key Differentiators
- Wideest input voltage range in its 1 A class (vs MAX17502EATB+T)
- Industry-leading 600 kHz switching for small magnetics (vs MAX17502GATB+T)
- Internal compensation eliminates external RC network (vs MAX17502FATB+)
- Tiny 3 mm x 2 mm TDFN-EP footprint (vs MAX17502HAUD+T)
Design Notes
Place the input ceramic capacitor (≥ 1 µF X7R, 100 V rating) as close as possible to the IN and GND pins to minimize the high-frequency switching loop. Keep the LX trace short and wide (≥ 0.5 mm) to reduce parasitic inductance, and connect the exposed pad (EP) to a continuous ground copper plane with at least 4 thermal vias to a bottom-side ground pour. This layout is critical to avoid ringing on the LX node and to maintain the 60 V absolute-maximum rating on IN under transient conditions.
At VIN = 24 V, VOUT = 5 V, and IOUT = 1 A, the MAX17502FATB+T dissipates approximately 0.7 W at 88% efficiency. The TDFN-EP package has theta_JA around 60 °C/W on a 1-oz copper 4-layer board, yielding a junction temperature rise of ~42 °C above ambient - safe up to ~85 °C ambient. Estimated: at VIN = 36 V to VOUT = 5 V at 1 A, dissipation rises to ~1.3 W (84% efficiency) and junction temperature climbs ~78 °C above ambient, demanding additional copper or airflow for higher ambient temperatures.
Do not leave the FB pin floating on the fixed-output variants - although the datasheet notes 'no connect' for fixed variants, an adjacent noisy trace can couple noise into the internal reference. Add a 100 nF ceramic bypass capacitor from IN to GND within 2 mm of the IC pins to suppress high-frequency ringing. Avoid using the SS pin without a capacitor (the default 1 ms soft-start is too fast for large output capacitances); a 10-100 nF capacitor on SS programs a controlled 1-10 ms startup that prevents inrush currents from tripping upstream fuses.
The 600 kHz switching frequency places fundamental noise above the AM broadcast band, but harmonics can still cause conducted-EMI issues. Add a small ferrite bead (≥ 600 Ω at 100 MHz) on the input side and use a shielded inductor to minimize radiated emissions. For EN 55011 Class B compliance, place a pi-filter (1 µF || bead || 1 µF) on the input and ensure the output capacitor ground return does not share a path with the input capacitor ground return.
Compliance Information
RoHS and REACH compliant per Heisener product listing. AEC-Q100 status not stated in web data - consult manufacturer for automotive-grade qualification. Lead-free and halogen-free per Analog Devices environmental policy.
