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Analog Devices Inc./Maxim Integrated MAX1572ETC180+
- Part No.:
- MAX1572ETC180+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1572ETC180+.pdf
- Description:
- IC REG BUCK 1.8V 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,608
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Product details
Overview
MAX1572ETC180+ from Maxim Integrated is a fixed-frequency, synchronous step-down DC-DC converter optimized for powering 1.80V microprocessor/DSP cores in space-constrained portable electronics. It delivers up to 800mA output current from a 2.6V–5.5V input, operates at 2MHz switching frequency, integrates P/N-channel MOSFETs, and provides a 170ms (min) active-low RESET output with internal pullup to OUT.
For engineers reviewing the MAX1572ETC180+ datasheet, MAX1572ETC180+ pinout, MAX1572ETC180+ application, or MAX1572ETC180+ equivalent, this page details its voltage-positioning load transient response, pulse-group/pulse-skip/forced-PWM mode selection via dual enable inputs, 48µA quiescent current in light-load operation, and compatibility with 2.2µH inductors and 10µF ceramic output capacitors.
Technical Context
The MAX1572ETC180+ employs a 2MHz current-mode PWM control architecture with slope compensation to stabilize the inner loop and suppress inductor staircasing. Its dual enable inputs (EN1/EN2) configure four operating modes: shutdown, pulse-group, pulse-skip, and forced-PWM - each with distinct trade-offs in efficiency, ripple, and transient response.
Voltage positioning is implemented via a programmable load line that dynamically adjusts output voltage based on load current, reducing total output variation by half during transients. The integrated high-side P-channel and low-side N-channel MOSFETs eliminate external diode requirements and support 100% duty-cycle operation near dropout, with RDS(ON) values of 0.18Ω (P-ch) and 0.20Ω (N-ch) at VBATT = 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.80V ±2% (voltage-positioned for load transients) |
| Max Output Current | 800mA continuous - supports core rail requirements of ARM9/ARM11 and DSPs |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V) and 3.3V/5V system rails |
| Switching Frequency | 2MHz (1.8–2.2MHz range) - enables use of 2.2µH shielded inductors and 10µF X5R ceramics |
| Quiescent Current | 48µA (typ) in pulse-group mode - extends battery life in standby states |
| RESET Delay | 170ms (min) after VOUT reaches 90% - ensures reliable power-on reset for baseband processors |
| Shutdown Current | 0.1µA - minimizes leakage in deep-sleep system states |
Pinout & Package
MAX1572ETC180+ 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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain reset output | Pulled low until VOUT ≥ 90% of 1.80V for ≥170ms; internal 14kΩ pullup to OUT |
| 2 (SS) | Soft-start timing node | Connect 1000pF–10nF capacitor to GND; controls output ramp rate and eliminates inrush |
| 3,5,11 (GND) | Analog/digital ground | Must connect all three pins and exposed paddle to low-impedance ground plane |
| 4 (OUT) | Output voltage sense | Direct feedback connection point; internally discharged to GND in shutdown |
| 6 (EN2) | Mode control input | Logic input defining operating mode together with EN1 (see truth table) |
| 7 (PGND) | Power ground | High-current return path for LX switch; connects directly to exposed paddle |
| 8 (LX) | Switch node | Drives external 2.2µH inductor; high-impedance in shutdown |
| 9 (BATT) | Main power input | 2.6V–5.5V supply; requires local 10µF ceramic bypass to GND |
| 10 (EN1) | Mode control input | Paired with EN2 to select shutdown, pulse-group, pulse-skip, or forced-PWM |
| 12 (ABATT) | Analog supply filter | Filtered via 10Ω resistor + 0.1µF capacitor to reject noise on BATT rail |
Key Features
| Feature | Design Value |
|---|---|
| Voltage positioning | Dynamic output droop tracking reduces total VOUT variation by 50% during load transients |
| Triple power-save modes | Pulse-group (48µA IQ), pulse-skip (faster wake-up), forced-PWM (low-noise spectrum) |
| Integrated MOSFETs | 0.18Ω P-ch + 0.20Ω N-ch switches eliminate Schottky diode and reduce BOM count |
| 170ms RESET timer | Guaranteed minimum delay ensures stable boot sequencing for baseband and application processors |
| 2MHz fixed-frequency PWM | Enables compact 2.2µH inductor and 10µF ceramic output capacitor without stability compromises |
| Soft-start with zero inrush | Controlled VOUT ramp prevents input current spikes into large output capacitance banks |
Applications
| Smartphone Baseband Power | Digital Camera Image Processor Rail |
|---|---|
Use Scenario: Powers 1.8V I/O or core rail of Qualcomm MSM or MediaTek baseband processors during call and data sessions. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 1.80V at up to 800mA with fast load-transient response. Use Value: Voltage positioning prevents overshoot during processor sleep-to-active transitions, maintaining signal integrity on high-speed interfaces. |
Use Scenario: Supplies 1.8V core voltage to CMOS image signal processors (e.g., Sony IMX series) in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting burst-mode imaging with minimal thermal rise. Use Value: 2MHz operation allows ultra-compact 2.2µH inductor placement near sensor module, reducing EMI coupling into analog pixel paths. |
| Portable Media Player DSP Core | Handheld Test Instrument Logic Rail |
Use Scenario: Provides clean 1.8V supply to TI C55x or Analog Devices SHARC DSP cores in MP3/DVD players. IC Role / Device Role / Timing Role: Synchronous buck converter with forced-PWM mode selected for low-noise audio playback. Use Value: Predictable 2MHz ripple spectrum simplifies EMI filtering and avoids heterodyning with audio DAC clocks. |
Use Scenario: Generates stable 1.8V logic rail for FPGA-based measurement engines in handheld oscilloscopes and multimeters. IC Role / Device Role / Timing Role: Primary DC-DC regulator with integrated RESET output for deterministic FPGA configuration timing. Use Value: 170ms (min) RESET assertion guarantees full power stabilization before FPGA startup sequence begins. |
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 |
|---|---|---|---|
| TPS62231DRYT | Fixed 1.8V output, 800mA, 3MHz switching, 22µA IQ - smaller package (2mm × 2mm DSBGA), no integrated RESET | Lacks dedicated RESET output; requires external supervisor IC for power-on sequencing | Choose when board area is critical and RESET functionality is handled elsewhere |
| RT8059NGQW | Adjustable 0.6–3.3V output, 800mA, 2MHz, 45µA IQ, includes RESET - but requires external feedback resistors and has 200ms RESET delay | Requires external resistor divider; RESET delay tolerance (±30ms) looser than MAX1572ETC180+ (170ms min) | Choose when adjustable output or multi-rail flexibility outweighs fixed 1.80V precision and tighter RESET timing |
Compared with TPS62231DRYT and RT8059NGQW, the MAX1572ETC180+ uniquely combines factory-trimmed 1.80V accuracy, integrated voltage positioning, and a guaranteed-minimum 170ms RESET delay - making it optimal for space-constrained portable systems requiring deterministic boot timing and minimal transient overshoot on fixed-core rails.
Availability
MAX1572ETC180+ is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera image processor rails, portable media player DSP cores, handheld test instrument logic rails, and PCMCIA card power management requiring stable component supply across industrial temperature ranges.
Supply support for MAX1572ETC180+ 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 high-performance analog and mixed-signal ICs for power management, interface, sensing, and RF applications in portable, industrial, and communications systems.
The MAX1572 product line targets high-efficiency, small-footprint DC-DC conversion for battery-powered microprocessor and DSP core supplies - emphasizing light-load efficiency, fast transient response, and integrated power-good/reset signaling.
FAQ
What output voltage does the MAX1572ETC180+ deliver?
The MAX1572ETC180+ delivers a factory-trimmed fixed output voltage of 1.80V with ±2% accuracy over load, line, and temperature. This value is encoded in the part number suffix "180" and verified per the Electrical Characteristics table, where output-voltage accuracy is specified as –2% to +2.8% under 100mA load at –40°C to +85°C.
How does the MAX1572ETC180+ achieve low quiescent current?
The MAX1572ETC180+ achieves 48µA typical quiescent current in pulse-group mode by dynamically powering down internal circuitry when the output voltage rises 0.8% above nominal regulation. During light-load conditions, the IC shuts off most bias networks and clock distribution, resuming full operation only when VOUT drops below the threshold - a behavior confirmed in the Applications Information section and Typical Operating Characteristics plots.
Does the MAX1572ETC180+ require an external Schottky diode?
No, the MAX1572ETC180+ does not require an external Schottky diode. It integrates both a high-side P-channel MOSFET and a low-side N-channel MOSFET to implement synchronous rectification. This design eliminates conduction losses associated with external diodes and is explicitly stated in the General Description: "No external diode is needed."
What is the function of the ABATT pin on the MAX1572ETC180+?
The ABATT pin on the MAX1572ETC180+ provides a filtered analog supply for sensitive internal circuitry. It must be connected to the BATT rail through a 10Ω resistor and decoupled to GND with a 0.1µF capacitor. This RC filter attenuates high-frequency noise on the main input rail, improving PWM controller stability and reducing output voltage ripple - a requirement detailed in the Applications Information section.
Can the MAX1572ETC180+ operate in 100% duty cycle mode?
Yes, the MAX1572ETC180+ supports 100% duty-cycle operation when the input voltage approaches the output voltage (e.g., 2.6V input to 1.8V output). In this state, the high-side P-channel MOSFET remains continuously on, and regulation is maintained solely by its RDS(ON). Dropout voltage is calculated as VDROPOUT = IOUT × (RDS(ON)P + RL), with RDS(ON)P = 0.18Ω (typ) at 3.6V input per the Electrical Characteristics table.
MAX1572ETC180+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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):
- 1.8V
- 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)
MAX1572ETC180+ FAQ
1.How can I place an order for MAX1572ETC180+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1572ETC180+ 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 MAX1572ETC180+ reliable?
The price and inventory of MAX1572ETC180+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1572ETC180+ is usually 5 days.
3.What payment methods are accepted for MAX1572ETC180+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1572ETC180+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1572ETC180+?
MAX1572ETC180+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1572ETC180+ 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 MAX1572ETC180+?
For technical support, including MAX1572ETC180+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1572ETC180+ requirements.
6.How does Aetrix verify that MAX1572ETC180+ is sourced from the original manufacturer or authorized distributors?
All MAX1572ETC180+ 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 MAX1572ETC180+ meets industry standards.
7.What is the process for return or replacement of MAX1572ETC180+?
All MAX1572ETC180+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1572ETC180+, 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 MAX1572ETC180+ part is unused and in its original packaging.
Return procedure for MAX1572ETC180+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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