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Analog Devices Inc./Maxim Integrated MAX1572ETC250
- Part No.:
- MAX1572ETC250
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1572ETC250.pdf
- Description:
- IC REG BUCK 2.5V 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,162
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Product details
Overview
MAX1572ETC250 from Maxim Integrated is a fixed-frequency, synchronous step-down DC-DC converter delivering a factory-preset 2.50V output at up to 800mA, operating from 2.6V–5.5V input, with 2MHz switching, 97% peak efficiency, and integrated 170ms RESET output. It powers low-voltage microprocessor/DSP cores in space-constrained portable electronics requiring high efficiency and low output ripple.
For engineers reviewing the MAX1572ETC250 datasheet, MAX1572ETC250 pinout, MAX1572ETC250 application, or MAX1572ETC250 equivalent, key selection criteria include its 2.50V fixed output, 12-pin 4mm × 4mm thin QFN package with exposed paddle, forced-PWM/low-quiescent pulse-group operation modes, and voltage-positioning load transient response for stable core rail regulation.
Technical Context
The MAX1572ETC250 implements a current-mode PWM control architecture with internal slope compensation, regulating peak inductor current via an error amplifier and current-sense feedback loop. Its 2MHz fixed-frequency operation enables use of tiny 2.2µH inductors and 10µF ceramic output capacitors while maintaining stability across load and line variations.
It integrates complementary P-channel (RDS(ON) = 0.18Ω typ) and N-channel (RDS(ON) = 0.20Ω typ) MOSFETs for synchronous rectification, eliminating external diodes. Three selectable power-saving modes-pulse-group (48µA quiescent), pulse-skip, and forced-PWM-are controlled by dual EN inputs per Table 1, enabling optimization for noise sensitivity or light-load efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.50V ±2% (voltage-positioned, supports dynamic load droop compensation) |
| Max Output Current | 800mA continuous - sufficient for DSP/microprocessor core rails under full load |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, or dual-cell alkaline systems |
| Switching Frequency | 2MHz (1.8–2.2MHz) - enables compact 2.2µH inductor and 10µF ceramic capacitor design |
| Quiescent Current | 48µA typical in pulse-group mode - extends battery life in standby/sleep states |
| RESET Delay | 170ms minimum after VOUT reaches 90% - provides reliable power-on reset timing for digital logic |
| Efficiency | Up to 97% at mid-load - minimizes thermal dissipation in thermally constrained handheld enclosures |
| Shutdown Current | 0.1µA - ensures negligible battery drain during system off-state |
Pinout & Package
MAX1572ETC250 is housed in a 12-pin, 4mm × 4mm × 0.8mm thin QFN package with exposed thermal paddle (EP), rated for -40°C to +85°C operation. The exposed paddle must be soldered to a PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain reset output | Pulled low until VOUT ≥ 90% of 2.50V for ≥170ms; internal 14kΩ pullup to OUT enables direct connection to logic without external resistor |
| 2 (SS) | Soft-start control | Capacitor-to-GND sets startup ramp time; discharges internally at 100Ω during shutdown to prevent output overshoot |
| 3,5,11 (GND) | Signal ground | Must be connected to exposed paddle and shared with PGND for low-noise reference and EMI control |
| 4 (OUT) | Output voltage sense | Direct feedback node; internal 14kΩ discharge path to GND in shutdown prevents floating condition |
| 6 (EN2), 10 (EN1) | Mode-select enable inputs | Binary control (Table 1): 00=shutdown, 01=pulse-group, 10=pulse-skip, 11=forced-PWM - no external logic required |
| 7 (PGND) | Power ground | High-current return path for LX switch; must connect directly to exposed paddle for minimal IR drop and thermal resistance |
| 8 (LX) | Switch node | Drives external 2.2µH inductor; high-impedance in shutdown; internal clamp diodes require careful layout to avoid exceeding power dissipation limits |
| 9 (BATT) | Main supply input | 2.6–5.5V input; requires local 10µF ceramic bypass capacitor to GND for high-frequency noise suppression |
| 12 (ABATT) | Analog supply filter | Filtered via 10Ω resistor + 0.1µF capacitor to BATT - isolates analog circuitry from noisy input rail |
Key Features
| Feature | Design Value |
|---|---|
| Voltage positioning | Matches output droop to load transients, halving total VOUT variation vs. conventional regulators and eliminating overshoot on load removal |
| Synchronous rectification | Integrated P/N-MOSFET pair eliminates external Schottky diode, reducing component count, board area, and conduction losses |
| Three power-save modes | Configurable via two pins: pulse-group (lowest IQ), pulse-skip (faster transient response), forced-PWM (predictable EMI spectrum) |
| 170ms RESET timer | Monitors regulated 2.50V output and asserts open-drain signal only after stable regulation is confirmed - eliminates need for external supervisor IC |
| Soft-start with zero inrush | Internal SS ramp prevents input current spikes during startup; 1000pF capacitor suffices for standard 10µF output capacitance |
| 100% duty-cycle capability | Maintains regulation down to VIN ≈ VOUT + IOUT×(RDS(ON)P + RL) - critical for battery brownout conditions near end-of-life |
Applications
| Smartphone Application Processor Core | Digital Camera Image Sensor Bias |
|---|---|
|
Use Scenario: Powers ARM-based application processor core (e.g., Qualcomm Snapdragon, MediaTek MT-series) requiring tightly regulated 2.50V rail with fast transient response during burst-mode video encoding. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing clean, low-noise 2.50V core voltage with integrated RESET for SoC initialization sequencing. Use Value: Voltage positioning prevents overshoot when CPU exits deep sleep, while 2MHz switching minimizes inductor size for ultra-thin bezel designs. |
Use Scenario: Supplies bias voltage to CMOS image sensor analog front-end in compact digital cameras where board area and thermal budget are constrained. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter delivering stable 2.50V with low 5mVP-P ripple to minimize sensor readout noise. Use Value: Forced-PWM mode ensures predictable EMI profile during image capture, avoiding interference with RF or audio subsystems. |
| Handheld Medical Diagnostic Device | Industrial Portable Data Terminal |
|
Use Scenario: Powers FPGA configuration and ADC reference circuitry in battery-operated ultrasound or glucose monitor where long runtime and reliability are critical. IC Role / Device Role / Timing Role: Main DC-DC converter with integrated 170ms RESET ensuring deterministic boot sequence and undervoltage protection during battery depletion. Use Value: Pulse-group mode reduces quiescent current to 48µA, extending operational time between charges without sacrificing startup integrity. |
Use Scenario: Regulates 2.50V rail for barcode scanner ASIC and touch controller in ruggedized warehouse terminals operating across wide temperature ranges. IC Role / Device Role / Timing Role: Robust buck converter with -40°C to +85°C rating, 100% duty-cycle operation, and thermal shutdown for harsh industrial environments. Use Value: Exposed paddle QFN package enables effective heat dissipation on 2-layer PCBs without heatsinks, lowering BOM cost. |
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 |
|---|---|---|---|
| TPS62231DRYR | 2.5V fixed output, 800mA, 3MHz switching, 21µA IQ, no integrated RESET, 6-pin WSON | Lacks RESET output and voltage positioning; smaller package but requires external reset supervisor for sequencing | Preferred when board area is paramount and RESET functionality is handled elsewhere |
| RT8059NGSP | 2.5V fixed output, 800mA, 1.5MHz switching, 55µA IQ, integrated RESET (200ms), 12-pin QFN | Lower switching frequency increases inductor size; RESET threshold is 92% (vs. 90%) and delay is 200ms (vs. 170ms) | Valid alternative if 1.5MHz operation and 200ms RESET timing align with system requirements |
Compared with MAX1572ETC250, TPS62231DRYR saves board space but adds system-level complexity due to missing RESET and voltage positioning, while RT8059NGSP offers similar integration at lower frequency and slightly longer reset timing - both require revalidation of transient response and thermal performance in the target layout.
Availability
MAX1572ETC250 is available at Aetrix Electronics and suitable for smartphone application processor cores, digital camera image sensor bias rails, handheld medical diagnostic devices, industrial portable data terminals, and PCMCIA card power management requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX1572ETC250 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX1572 product line delivers highly integrated, high-efficiency DC-DC converters optimized for space-constrained portable electronics with stringent battery-life and transient-response requirements.
FAQ
What is the exact output voltage of the MAX1572ETC250?
The MAX1572ETC250 is factory-trimmed to deliver a precise 2.50V output voltage, with accuracy specified as ±2% over load, line, and temperature (-40°C to +85°C). This value is fixed and non-adjustable, as indicated by the "250" suffix in the part number and confirmed in the Selector Guide table showing MAX1572ETC250 with top mark AABZ and VOUT = 2.50V.
Does the MAX1572ETC250 require an external Schottky diode?
No, the MAX1572ETC250 does not require an external Schottky diode. It integrates both high-side P-channel and low-side N-channel MOSFETs for fully synchronous rectification, as explicitly stated in the Features list and General Description. This eliminates conduction losses and external component count.
How is the RESET function timed in the MAX1572ETC250?
The MAX1572ETC250 asserts its open-drain RESET output low until the regulated 2.50V output reaches and sustains ≥90% of nominal (i.e., ≥2.25V) for a minimum of 170ms. This timing is guaranteed per Electrical Characteristics tables and verified in Typical Operating Characteristics waveform MAX1572toc11, making it suitable for reliable SoC power-on sequencing.
What package type and thermal characteristics does the MAX1572ETC250 use?
The MAX1572ETC250 uses a 12-pin, 4mm × 4mm × 0.8mm thin QFN package with exposed thermal paddle (EP). Its continuous power dissipation is rated at 1349mW at +70°C, with derating of 16.9mW/°C above that temperature. The exposed paddle must be soldered to a PCB ground plane to achieve specified thermal performance and electrical stability.
Can the MAX1572ETC250 operate with input voltage close to its 2.50V output?
Yes, the MAX1572ETC250 supports 100% duty-cycle operation, allowing regulation when input voltage approaches the output voltage. Dropout is determined by IOUT × (RDS(ON)P + RL); with typical RDS(ON)P = 0.18Ω and a 2.2µH inductor (RL ≈ 50–170mΩ), dropout remains under 300mV at 800mA - enabling operation down to ~2.8V input in many configurations.
MAX1572ETC250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 800mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (4x4)
MAX1572ETC250 FAQ
1.How can I place an order for MAX1572ETC250 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1572ETC250 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 MAX1572ETC250 reliable?
The price and inventory of MAX1572ETC250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1572ETC250 is usually 5 days.
3.What payment methods are accepted for MAX1572ETC250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1572ETC250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1572ETC250?
MAX1572ETC250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1572ETC250 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 MAX1572ETC250?
For technical support, including MAX1572ETC250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1572ETC250 requirements.
6.How does Aetrix verify that MAX1572ETC250 is sourced from the original manufacturer or authorized distributors?
All MAX1572ETC250 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 MAX1572ETC250 meets industry standards.
7.What is the process for return or replacement of MAX1572ETC250?
All MAX1572ETC250 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1572ETC250, 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 MAX1572ETC250 part is unused and in its original packaging.
Return procedure for MAX1572ETC250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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