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Analog Devices Inc./Maxim Integrated MAX17620ATA+T
- Part No.:
- MAX17620ATA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MAX17620ATA+T.pdf
- Description:
- IC REG BUCK ADJ 600MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,227
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Product details
Overview
The MAX17620ATA+T from Maxim Integrated is a high-frequency synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, operating from 2.7V to 5.5V input and delivering up to 600mA at adjustable 1.5V–100% VIN output. It features 4MHz fixed-frequency PWM mode, skip-mode light-load operation (40µA IQ), soft-start, open-drain PGOOD, and EN control - deployed in point-of-load power supplies for portable instrumentation and distributed systems.
For engineers reviewing the MAX17620ATA+T datasheet, MAX17620ATA+T pinout, MAX17620ATA+T application, or MAX17620ATA+T equivalent, key selection criteria include its 2mm × 2mm TDFN package, internal compensation enabling stable regulation across all output voltages, 100% duty-cycle capability for battery-end-of-life support, ±0.75%/+1% FB reference accuracy, and thermal shutdown at +165°C with 10°C hysteresis.
Technical Context
The MAX17620ATA+T employs peak-current-mode control with internal slope compensation optimized for 1µH inductors, supporting both PWM (fixed 4MHz) and skip-mode (variable frequency, 40µA IQ) based on MODE pin state. Its architecture integrates high-side pMOS (100–200mΩ) and low-side nMOS (70–145mΩ) switches, with cycle-by-cycle overcurrent protection triggered at 1.15–1.8A peak current and valley current limiting down to 920mA.
Startup behavior includes monotonic 1ms soft-start ramping VREF from 0V to 0.8V, prebias-compatible operation, and undervoltage lockout (2.6V typ, 200mV hysteresis). The device maintains regulation via an error amplifier driving PWM logic, with PGOOD asserting high-impedance above 93.5% VOUT and pulling low below 90% VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, USB, and standard 3.3V/5V rails without external LDO pre-regulation. |
| Output Current | Up to 600mA - sufficient for powering microcontrollers, sensors, and RF transceivers in compact embedded systems. |
| Switching Frequency | 4MHz (±4%) - enables use of 1µH inductors and 10µF ceramic output capacitors, minimizing solution size to 12mm². |
| Quiescent Current | 40µA in skip mode - extends battery life in always-on, low-duty-cycle IoT endpoints. |
| FB Reference Accuracy | +1% / −0.75% - ensures tight output voltage tolerance across temperature (−40°C to +125°C) and line/load conditions. |
| Thermal Shutdown | +165°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Package | 8-pin TDFN (2mm × 2mm, 0.5mm pitch) - surface-mount footprint compatible with automated assembly and high-density layouts. |
Pinout & Package
The MAX17620ATA+T is housed in an 8-pin, 2mm × 2mm TDFN package with exposed pad (EP) thermally connected to GND. Pin 1 is IN; pin 2 is GND; pin 3 is EN; pin 4 is MODE; pin 5 is PGOOD; pin 6 is FB; pin 7 is VOUT; pin 8 is LX. The EP must be soldered to a solid GND plane for optimal thermal performance (θJA = 102°C/W, θJC = 8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power supply input | Bypassed with ≥2.2µF ceramic capacitor; withstands −0.3V to +6V transient stress. |
| GND | Ground reference | Common return for power, control, and feedback paths; connects to EP for thermal conduction. |
| EN | Enable control input | Active-high logic (VEN_HIGH ≥ 2V); pulls device into shutdown (<0.1µA) when low. |
| MODE | Operating mode select | Ground = PWM mode (4MHz fixed); open = skip mode (variable frequency, 40µA IQ). |
| PGOOD | Open-drain power-good indicator | Asserts high-Z when VOUT > 93.5% target; pulls low when VOUT < 90% target; requires external pullup. |
| FB | Feedback input | Monitors resistor-divider output; internal 0.748V reference sets VOUT = 0.748V × (1 + R1/R2). |
| VOUT | Output voltage sense | Direct connection to regulated output node; used for internal loop compensation and PGOOD monitoring. |
| LX | Switching node | Connects to inductor; carries pulsed current; requires short, low-inductance routing to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates need for external high-side/low-side switches and gate drivers - reduces BOM count and layout complexity. |
| Internal compensation | Enables stable regulation across full 1.5V–100% VIN output range without external compensation components. |
| All-ceramic capacitor support | Validated with 2.2µF input and 10µF output X7R ceramics - avoids electrolytics, improves reliability and temperature stability. |
| 100% duty-cycle operation | Maintains regulation even as input drops to VOUT + (IOUT × RDS-ONH), extending usable battery voltage range. |
| Robust protection suite | Includes UVLO (2.6V), cycle-by-cycle OCP (1.45A typ), thermal shutdown (+165°C), and PGOOD monitoring. |
Applications
| Point-of-Load Power Supply | Standard 5V Rail Supplies |
|---|---|
Use Scenario: Local regulation for FPGA I/O banks or ASIC core logic requiring clean, tightly regulated 1.8V at ≤600mA within space-constrained PCB areas. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing dynamically responsive, low-noise DC power with fast load-transient recovery. Use Value: 4MHz switching enables miniature 1µH inductor and 10µF ceramic output capacitor, achieving total solution size of just 12mm². | Use Scenario: Deriving stable 3.3V or 2.5V from a shared 5V system rail for mixed-signal peripherals such as ADCs, DACs, and interface ICs. IC Role / Device Role / Timing Role: Efficient, low-quiescent-current step-down converter maintaining regulation during variable load bursts typical of data acquisition cycles. Use Value: Skip-mode operation draws only 40µA at light loads, reducing standby power while preserving fast wake-up response. |
| Battery-Powered Instruments | Distributed Power Systems |
Use Scenario: Portable multimeters, gas detectors, or handheld medical sensors powered by single-cell Li-ion (2.7–4.2V) requiring long runtime and reliable cold-temperature operation. IC Role / Device Role / Timing Role: Main power converter supporting 100% duty-cycle operation to extract maximum energy from depleting battery voltage down to 2.7V. Use Value: −40°C to +125°C rated operation and ±0.75%/+1% FB accuracy ensure consistent output voltage across battery discharge and environmental extremes. | Use Scenario: Remote sensor nodes in industrial automation or building management systems where local 3.3V/1.8V rails are generated from centralized 12V or 24V backplanes. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage converting intermediate bus voltage with minimal heatsinking requirements. Use Value: Exposed-pad TDFN package and 102°C/W θJA enable operation at full 600mA load in ambient temperatures up to +85°C with standard 4-layer PCB cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | 2.7–6.5V input, 600mA, 1.8–5.5V fixed/adjustable output; 1.8MHz max switching frequency; 250nA shutdown current. | Lower IQ (250nA vs. 0.1µA) but slower switching limits inductor/capacitor miniaturization; lacks PGOOD and MODE pin flexibility. | Prefer when ultra-low shutdown current is critical and board area allows larger passive components. |
| MP2152GQZ-P | 2.5–5.5V input, 600mA, 0.6–5.5V output; 2MHz switching; 30µA quiescent current in forced-PWM; no skip-mode option. | No skip-mode - less efficient at light loads; no PGOOD; different pinout (no dedicated VOUT pin); smaller 1.5mm × 2mm QFN package. | Consider for cost-sensitive designs where constant-frequency operation suffices and PGOOD is not required. |
Compared with TPS62840DLCR and MP2152GQZ-P, the MAX17620ATA+T uniquely combines 4MHz operation for smallest passives, dual-mode (PWM/skip) control for wide-load-efficiency optimization, integrated PGOOD, and a dedicated VOUT pin for accurate sensing - making it optimal for space-constrained, battery-aware, and system-monitoring-critical applications.
Availability
The MAX17620ATA+T is available at Aetrix Electronics and suitable for point-of-load power supplies, battery-powered instrumentation, and distributed power systems requiring stable component supply, extended temperature operation (−40°C to +125°C), and compact 2mm × 2mm packaging.
Supply support for MAX17620ATA+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX17620ATA+T belongs to Maxim's high-frequency synchronous buck converter product line, engineered specifically for space-constrained, battery-efficient, and thermally demanding embedded systems requiring minimal external components and guaranteed performance across automotive-grade temperature ranges.
FAQ
What is the minimum input voltage required for the MAX17620ATA+T to maintain regulation at 1.8V output and 600mA load?
The minimum input voltage is calculated as VIN_MIN = VOUT + (IOUT × RON), where RON is the sum of high-side MOSFET on-resistance and inductor DCR. At VIN = 3.6V and ILX = 190mA, RDS-ONH is 120–200mΩ; using a typical 60mΩ inductor DCR and 160mΩ RDS-ONH yields VIN_MIN ≈ 1.8V + (0.6A × 0.22Ω) = 1.93V. However, UVLO (2.55V min) and practical margin require ≥2.7V input per datasheet specification. The MAX17620ATA+T achieves true 100% duty-cycle operation only above UVLO threshold.
Does the MAX17620ATA+T support startup into a prebiased output, and how does it behave?
Yes, the MAX17620ATA+T supports soft-start into a prebiased output without discharging it. If the prebias voltage is below the target output, the device ramps VOUT monotonically from the prebias level to the setpoint during the 1ms soft-start period. If the prebias exceeds the target, no switching occurs during soft-start. After soft-start, in PWM mode the device sinks current to regulate downward; in skip mode, it remains idle until VOUT falls below the target. This behavior is confirmed in the "Startup Into a Prebiased Output" section of the MAX17620ATA+T datasheet.
What are the recommended external components for a 1.8V/600mA design using the MAX17620ATA+T?
The typical application circuit specifies a 2.2µF/10V X7R input capacitor (0603), 1µH/2.7A saturation inductor (e.g., Taiyo Yuden MAKK2016H1ROM), and 10µF/6.3V X7R output capacitor (0805). Feedback resistors are R1 = 24kΩ and R2 = 19.1kΩ for 1.8V. All components are selected to match the MAX17620ATA+T's internal compensation and slope compensation optimized for 1µH/10µF, ensuring stability and minimal output ripple across load and temperature.
How does the MODE pin affect efficiency and output ripple in the MAX17620ATA+T?
When MODE is grounded, the MAX17620ATA+T operates in fixed 4MHz PWM mode - delivering lowest output voltage ripple and constant EMI profile but drawing 6mA quiescent current at light loads. When MODE is left open, it enters skip mode - reducing IQ to 40µA and improving light-load efficiency, at the cost of higher output ripple and variable switching frequency. The trade-off is explicit: PWM for noise-sensitive, steady-load applications; skip mode for battery longevity in intermittent-use systems. Both modes are validated across −40°C to +125°C.
Is the MAX17620ATA+T RoHS-compliant and lead-free?
Yes, the MAX17620ATA+T is RoHS-compliant and lead-free. The "+" suffix in the part number denotes a lead(Pb)-free/RoHS-compliant package, as confirmed in the Ordering Information table on page 14 of the MAX17620ATA+T datasheet. The 8-pin TDFN package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements for standard reflow assembly.
MAX17620ATA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 3.4V
- Current - Output:
- 600mA
- Frequency - Switching:
- 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN-EP (2x2)
MAX17620ATA+T FAQ
1.How can I place an order for MAX17620ATA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17620ATA+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX17620ATA+T reliable?
The price and inventory of MAX17620ATA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17620ATA+T is usually 5 days.
3.What payment methods are accepted for MAX17620ATA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17620ATA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17620ATA+T?
MAX17620ATA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17620ATA+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX17620ATA+T?
For technical support, including MAX17620ATA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17620ATA+T requirements.
6.How does Aetrix verify that MAX17620ATA+T is sourced from the original manufacturer or authorized distributors?
All MAX17620ATA+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX17620ATA+T meets industry standards.
7.What is the process for return or replacement of MAX17620ATA+T?
All MAX17620ATA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17620ATA+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX17620ATA+T part is unused and in its original packaging.
Return procedure for MAX17620ATA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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