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Analog Devices Inc./Maxim Integrated MAX1572ETC075+
- Part No.:
- MAX1572ETC075+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1572ETC075+.pdf
- Description:
- IC REG BUCK 0.75V 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:998
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Product details
Overview
MAX1572ETC075+ from Maxim Integrated is a fixed-frequency, synchronous step-down DC-DC converter designed to power low-voltage microprocessor/DSP cores in portable electronics. It delivers a factory-trimmed 0.75V output at up to 800mA, operates from 2.6V–5.5V input, switches at 2MHz, and integrates P- and N-channel MOSFETs with no external diode required.
For engineers reviewing the MAX1572ETC075+ datasheet, MAX1572ETC075+ pinout, MAX1572ETC075+ application, or MAX1572ETC075+ equivalent, key selection criteria include its 0.75V fixed output, 48µA quiescent current in pulse-group mode, 170ms RESET timer, 12-pin 4mm × 4mm thin QFN package with exposed paddle, and voltage-positioning load transient response.
Technical Context
The MAX1572ETC075+ uses a 2MHz fixed-frequency current-mode PWM control architecture with internal slope compensation to stabilize the inner loop and prevent subharmonic oscillation. Its dual-MOSFET synchronous rectification eliminates external diode losses and supports 100% duty-cycle operation near dropout.
Three selectable operating modes-pulse-group (48µA IQ), pulse-skip, and forced-PWM-are controlled via EN1/EN2 logic inputs. Voltage positioning dynamically adjusts output setpoint vs. load current to halve total output voltage variation during transients, while the open-drain RESET output provides 170ms (min) power-on reset timing referenced to OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.75V ±2% (voltage-positioned for load transient stability) |
| Max Output Current | 800mA guaranteed continuous output into regulated load |
| Input Voltage Range | 2.6V to 5.5V - supports single-cell Li-ion, Li-poly, or dual-cell alkaline inputs |
| Switching Frequency | 2MHz (1.8–2.2MHz range) - enables use of 2.2µH inductor and 10µF ceramic output cap |
| Quiescent Current | 48µA typical in pulse-group mode - extends battery life in standby |
| RESET Delay | 170ms minimum after VOUT reaches 90% - ensures reliable system initialization |
| Shutdown Current | 0.1µA maximum - minimizes battery drain in off-state |
| Package | 12-pin 4mm × 4mm thin QFN with exposed thermal paddle - optimized for compact portable PCBs |
Pinout & Package
MAX1572ETC075+ is housed in a 12-pin, 4mm × 4mm 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 0.75V for ≥170ms; internal 14kΩ pullup to OUT |
| 2 (SS) | Soft-start control | Capacitor-to-GND sets startup ramp time; discharges internally at shutdown |
| 3,5,11 (GND) | Signal ground | Must connect to exposed paddle and system ground plane for noise immunity |
| 4 (OUT) | Output voltage sense | Direct connection to regulator output; internal 14kΩ discharge path to GND in shutdown |
| 6 (EN2) | Enable/Mode control input 2 | Logic input defining operating mode per truth table (e.g., EN1=0, EN2=1 → pulse-group) |
| 7 (PGND) | Power ground | High-current return path for LX switch; connects directly to exposed paddle |
| 8 (LX) | Switch node | Connects to inductor; high-impedance in shutdown; contains internal clamp diodes to PGND/BATT |
| 9 (BATT) | Main supply input | 2.6V–5.5V input; requires local 10µF ceramic bypass capacitor to GND |
| 10 (EN1) | Enable/Mode control input 1 | Paired with EN2 to select shutdown, pulse-group, pulse-skip, or forced-PWM mode |
| 12 (ABATT) | Analog supply filter input | Connected via 10Ω resistor to BATT; 0.1µF capacitor to GND filters noise for internal analog circuits |
Key Features
| Feature | Design Value |
|---|---|
| Voltage positioning | Dynamic output setpoint adjustment matches load regulation to transient droop, cutting total VOUT variation by 50% |
| Synchronous rectification | Integrated P- and N-channel MOSFETs eliminate external Schottky diode, reducing component count and conduction loss |
| Triple power-save modes | Pulse-group (48µA IQ), pulse-skip (faster wake-up), and forced-PWM (fixed 2MHz, low-noise spectrum) selectable via EN1/EN2 |
| 170ms RESET timer | Guaranteed minimum delay from VOUT reaching 90% to RESET deassertion - ensures stable core voltage before system boot |
| Soft-start with zero inrush | Capacitor-programmable ramp prevents input current overshoot; supports >10µF output capacitance with CSS = COUT/10,000 |
| 100% duty-cycle capability | Enables operation with VIN as low as VOUT + IOUT × (RDS(ON)P + RL), critical for battery end-of-life support |
Applications
| Cell Phones & Smartphones | PDAs & Palmtops |
|---|---|
|
Use Scenario: Powering ARM-based application processor cores (e.g., Cortex-A series) requiring tightly regulated 0.75V at up to 800mA during burst-mode operation. IC Role / Device Role / Timing Role: Primary core voltage regulator with voltage positioning to suppress overshoot during CPU sleep-to-active transitions. Use Value: Enables 0.75V operation with <5mVP-P ripple and <100mV transient deviation, extending battery runtime via 48µA quiescent current in pulse-group mode. |
Use Scenario: Supplying DSP subsystems in handheld organizers with dynamic load profiles ranging from µA idle to 800mA active compute. IC Role / Device Role / Timing Role: Synchronous buck converter delivering stable 0.75V core rail; RESET output sequences baseband IC initialization. Use Value: 2MHz switching allows ultra-compact layout with 2.2µH inductor and 10µF ceramic output cap, reducing board area by >30% vs. 500kHz solutions. |
| Digital Cameras & Camcorders | PCMCIA Cards & Hand-Held Instruments |
|
Use Scenario: Powering image signal processors (ISPs) during high-speed auto-focus or video capture, where rapid load steps demand fast transient response. IC Role / Device Role / Timing Role: Core voltage regulator with wide-bandwidth feedback loop and voltage positioning to minimize VOUT deviation during 20mA→550mA load steps. Use Value: Achieves <100µs recovery time and <80mV undershoot in forced-PWM mode, ensuring ISP clock stability during frame capture bursts. |
Use Scenario: Providing regulated 0.75V to FPGA configuration logic or microcontroller cores in space-constrained field instruments with intermittent high-current events. IC Role / Device Role / Timing Role: Compact, thermally efficient DC-DC converter with exposed paddle for passive cooling; RESET output synchronizes firmware watchdog reset. Use Value: 4mm × 4mm QFN package fits within PCMCIA Type II envelope; 170ms RESET guarantees clean boot after cold start or brownout recovery. |
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 | 0.75V fixed output, 800mA, 3MHz switching, 21µA IQ - smaller quiescent current but no integrated RESET output | Lacks dedicated RESET function; requires external supervisor IC for power-on sequencing | Select when minimal IQ dominates design priority and RESET can be implemented externally |
| RT8059NGQW | 0.75V fixed output, 1A, 2MHz, 55µA IQ, includes RESET - but RESET is push-pull (not open-drain) and referenced to VCC, not OUT | RESET timing and reference differ: 200ms typ, VCC-referenced threshold vs. MAX1572ETC075+'s 170ms min, OUT-referenced 90% threshold | Select when higher current headroom (1A) is needed and VCC-referenced RESET is acceptable for system timing |
Compared with TPS62231DRYR and RT8059NGQW, the MAX1572ETC075+ uniquely combines 0.75V fixed output, 800mA capability, 2MHz operation, 48µA pulse-group IQ, and an OUT-referenced 170ms open-drain RESET - enabling simpler, more robust power sequencing in portable microprocessor systems without external components.
Availability
MAX1572ETC075+ is available at Aetrix Electronics and suitable for cell phones, digital cameras, and handheld instrumentation requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX1572ETC075+ 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 demanding industrial, communications, and portable applications.
The MAX1572 product line targets high-efficiency, space-constrained DC-DC conversion in battery-powered microprocessor systems, emphasizing low IQ, fast transient response, and integrated power-good/reset functionality.
FAQ
What is the output voltage tolerance of the MAX1572ETC075+ over temperature and load?
The MAX1572ETC075+ delivers 0.75V with ±2% accuracy over -40°C to +85°C and 0mA–800mA load, including voltage positioning effects. At 100mA load, output-voltage accuracy is -1.2% to +2.8%; at 800mA, it is -2% to +2%, as specified in the Electrical Characteristics table under "Output-Voltage Accuracy (Voltage Positioning)".
Does the MAX1572ETC075+ require an external Schottky diode?
No, the MAX1572ETC075+ does not require an external Schottky diode. It integrates both a high-side P-channel and low-side N-channel MOSFET for synchronous rectification, eliminating conduction losses and external component count. This is explicitly stated in the Features list and General Description.
How is the RESET output of the MAX1572ETC075+ configured and timed?
The MAX1572ETC075+ RESET output is an open-drain signal with an internal 14kΩ pullup to OUT. It remains low until the output voltage reaches and sustains ≥90% of 0.75V for a minimum of 170ms, then goes high-impedance. During undervoltage, RESET pulls low again - providing precise, output-referenced power-on and brownout reset timing.
What inductor value and specifications are recommended for the MAX1572ETC075+?
A 2.2µH shielded inductor with ≥1A saturation current is recommended for full 800mA loads. Per Table 2 in the datasheet, Murata LQH32CN (97mΩ DCR, 790mA ISAT) and Sumida CDRH2D11 (78mΩ DCR, 780mA ISAT) are validated options. Lower DCR improves efficiency; shielding reduces EMI coupling to sensitive analog sections.
Can the MAX1572ETC075+ operate with input voltage close to its 0.75V output?
Yes, the MAX1572ETC075+ supports 100% duty-cycle operation when VIN approaches VOUT. Dropout voltage equals IOUT × (RDS(ON)P + RL), where RDS(ON)P is ≤0.45Ω (at -40°C) and RL is the inductor's DC resistance. For example, with 800mA load and 50mΩ inductor, dropout is ~44mV - enabling operation down to ~0.794V input.
MAX1572ETC075+ 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):
- 0.75V
- 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)
MAX1572ETC075+ FAQ
1.How can I place an order for MAX1572ETC075+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1572ETC075+ 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 MAX1572ETC075+ reliable?
The price and inventory of MAX1572ETC075+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1572ETC075+ is usually 5 days.
3.What payment methods are accepted for MAX1572ETC075+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1572ETC075+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1572ETC075+?
MAX1572ETC075+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1572ETC075+ 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 MAX1572ETC075+?
For technical support, including MAX1572ETC075+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1572ETC075+ requirements.
6.How does Aetrix verify that MAX1572ETC075+ is sourced from the original manufacturer or authorized distributors?
All MAX1572ETC075+ 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 MAX1572ETC075+ meets industry standards.
7.What is the process for return or replacement of MAX1572ETC075+?
All MAX1572ETC075+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1572ETC075+, 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 MAX1572ETC075+ part is unused and in its original packaging.
Return procedure for MAX1572ETC075+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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