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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 0.75V 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,363
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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 portable electronics. It delivers up to 800mA output current from a 2.6V–5.5V input, operates at 2MHz switching frequency, and integrates P-channel and N-channel MOSFETs with no external diode required. Its 170ms (min) active-low RESET output supports power-on/undervoltage reset in battery-powered handheld devices.
For engineers reviewing the MAX1572ETC180 datasheet, MAX1572ETC180 pinout, MAX1572ETC180 application, or MAX1572ETC180 equivalent, key selection considerations include its 1.80V fixed output, 48µA typical quiescent current in pulse-group mode, voltage-positioning load transient response, and 12-pin 4mm × 4mm thin QFN package with exposed paddle.
Technical Context
The MAX1572ETC180 employs a 2MHz fixed-frequency current-mode PWM control architecture with internal slope compensation to ensure loop stability and prevent subharmonic oscillation. It integrates a high-side P-channel MOSFET (RDS(ON) = 0.18Ω typ at VBATT = 3.6V) and low-side N-channel MOSFET (RDS(ON) = 0.20Ω typ), enabling synchronous rectification and eliminating external diode requirements.
Three selectable operating modes-pulse-group, 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 170ms RESET timer ensures reliable system initialization after VOUT reaches 90% of nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.80V ±2% (voltage-positioning enabled; accuracy includes line/load/temp) |
| Max Output Current | 800mA continuous; supports full-load operation with 2.2µH inductor and 10µF ceramic output capacitor |
| Input Voltage Range | 2.6V to 5.5V; includes undervoltage lockout at 2.35V (typ) with 1% hysteresis |
| Switching Frequency | 2MHz (1.8–2.2MHz range); enables use of tiny 2.2µH inductors and low-profile 10µF ceramic capacitors |
| Quiescent Current | 48µA (typ) in pulse-group mode; reduces system standby power in battery-critical applications |
| RESET Delay Time | 170ms (min) from VOUT > 90% to RESET deassertion; open-drain output with 14kΩ internal pullup to OUT |
| Shutdown Current | 0.1µA (typ); enables ultra-low-power system sleep states without external disconnect circuitry |
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 performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain reset output | Pulled low until VOUT ≥ 90% of 1.80V for ≥170ms; internal 14kΩ pullup to OUT enables direct connection to microcontroller reset input |
| 2 (SS) | Soft-start timing control | Capacitor-connected node; 1000pF to GND sets soft-start time and eliminates inrush current during startup |
| 3, 5, 11 (GND) | Digital ground reference | Must connect to exposed paddle and PGND; provides low-impedance return path for control circuitry |
| 4 (OUT) | Output voltage sense input | Direct connection to regulated output; internal 14kΩ discharge path to GND in shutdown prevents floating bias |
| 6 (EN2), 10 (EN1) | Mode-select enable inputs | Logic-controlled interface: EN1=0/EN2=1 → pulse-group; EN1=1/EN2=0 → pulse-skip; EN1=1/EN2=1 → forced-PWM |
| 7 (PGND) | Power ground terminal | Primary return path for high-current LX switching node; must tie directly to exposed paddle |
| 8 (LX) | Switch node | Connects to inductor; high-impedance in shutdown; internal clamp diodes to PGND/BATT require careful layout to avoid exceeding power dissipation limits |
| 9 (BATT) | Main input supply | 2.6V–5.5V source; requires 10µF ceramic bypass capacitor placed adjacent to pin for EMI suppression |
| 12 (ABATT) | Analog supply filter input | Connected to BATT via 10Ω resistor and 0.1µF capacitor to GND; isolates analog reference from digital noise on main rail |
Key Features
| Feature | Design Value |
|---|---|
| Voltage-positioning load transient response | Reduces total output-voltage variation by 50% vs. conventional regulators during load steps, eliminating overshoot when load is removed |
| Synchronous dual-MOSFET integration | Eliminates need for external Schottky diode; achieves up to 97% efficiency at 500mA with 3.6V input and 1.8V output |
| Triple-mode operation control | EN1/EN2 pins select between pulse-group (lowest IQ), pulse-skip (faster transient response), or forced-PWM (predictable EMI spectrum) |
| Integrated 170ms RESET generator | Provides guaranteed power-on reset timing without external RC network; simplifies BOM and improves reliability over discrete solutions |
| 100% duty-cycle capability | Enables dropout operation down to VIN – VOUT ≈ IOUT × (RDS(ON)P + RL); supports high-efficiency operation near input-output crossover |
Applications
| Smartphone Application Processor Core Supply | Portable Media Player DSP Power Rail |
|---|---|
|
Use Scenario: Powers 1.80V core rail of ARM-based application processors in smartphones during active and burst-mode operation. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 1.80V at up to 800mA with fast transient response to CPU load changes. Use Value: Voltage positioning minimizes output deviation during sudden processor load transitions, maintaining stable core voltage without external compensation. |
Use Scenario: Supplies 1.80V DSP core in MP3/DVD players during audio decode and video playback with variable computational load. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter operating in pulse-skip mode during idle and forced-PWM during real-time processing. Use Value: 48µA quiescent current extends battery life in standby; 2MHz switching allows compact 2.2µH inductor and 10µF ceramic capacitor layout. |
| Digital Camera Image Sensor Bias Rail | Handheld Instrument Microcontroller Core |
|
Use Scenario: Provides clean, low-noise 1.80V supply to CMOS image sensor logic and ADC interface circuits in compact digital cameras. IC Role / Device Role / Timing Role: Regulator with forced-PWM mode selected to suppress switching noise near sensitive analog front-end circuitry. Use Value: Predictable 2MHz ripple spectrum enables effective filtering; <5mVP-P output ripple meets image sensor noise floor requirements. |
Use Scenario: Delivers 1.80V core voltage to 32-bit microcontrollers in battery-operated test equipment with strict power-on sequencing. IC Role / Device Role / Timing Role: Power management IC providing regulated output plus synchronized 170ms RESET signal for deterministic MCU boot. Use Value: Integrated RESET eliminates need for external supervisor IC; 0.1µA shutdown current preserves battery charge during extended storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.8V fixed output, 800mA, 3MHz switching, but lacks integrated RESET and voltage positioning | Requires external reset IC and compensation network for equivalent transient performance | Preferred where board space permits separate reset supervision and higher switching frequency is needed for smaller magnetics |
| RT8059NGQW | 1.8V fixed output, 800mA, 2MHz, includes power-good but no RESET output or voltage positioning | Supports basic sequencing but cannot replicate MAX1572ETC180's load-transient optimization or guaranteed reset timing | Selected when power-good signaling suffices and cost-sensitive designs prioritize footprint over advanced regulation features |
Compared with TPS62231DRYR and RT8059NGQW, the MAX1572ETC180 uniquely combines 1.80V fixed output, integrated 170ms RESET, voltage positioning, and triple-mode efficiency optimization in a single 4mm × 4mm QFN - enabling simpler, more robust power delivery for portable microprocessor cores without external support components.
Availability
MAX1572ETC180 is available at Aetrix Electronics and suitable for smartphone application processor core supplies, portable media player DSP rails, digital camera image sensor biasing, and handheld instrument microcontroller power systems 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for portable, industrial, and communications applications.
The MAX1572 product line was designed specifically for high-efficiency, space-constrained DC-DC conversion in battery-powered portable electronics, emphasizing low quiescent current, integrated functionality, and robust transient response for microprocessor core rails.
FAQ
What output voltage does the MAX1572ETC180 deliver?
The MAX1572ETC180 delivers a factory-trimmed fixed output voltage of 1.80V with ±2% accuracy over temperature, line, and load conditions. This value is preset at wafer test and cannot be adjusted externally - the '180' suffix explicitly denotes the 1.80V variant within the MAX1572 family. The device uses voltage positioning to dynamically offset the regulation point based on load current, ensuring minimal overshoot during load removal.
How does the MAX1572ETC180 achieve high efficiency across light loads?
The MAX1572ETC180 achieves high light-load efficiency through three selectable operating modes controlled by EN1 and EN2 pins: pulse-group mode (48µA typical IQ), pulse-skip mode (faster transient response), and forced-PWM mode (fixed 2MHz for EMI control). In pulse-group mode, internal circuitry powers down when VOUT exceeds +0.8% of nominal, reducing quiescent current significantly compared to continuous PWM operation - a critical advantage for battery runtime in portable devices using the MAX1572ETC180.
What is the function of the RESET pin on the MAX1572ETC180?
The RESET pin on the MAX1572ETC180 is an active-low, open-drain output that remains low for a minimum of 170ms after VOUT reaches 90% of its 1.80V nominal value. It features an internal 14kΩ pullup resistor to the OUT pin, enabling direct connection to microcontroller reset inputs without external components. During undervoltage events, RESET asserts again when VOUT drops below 90% - providing reliable power-on and brownout reset functionality integral to the MAX1572ETC180's system-level power management.
Can the MAX1572ETC180 operate with input voltage close to its 1.80V output?
Yes, the MAX1572ETC180 supports 100% duty-cycle operation when the input voltage approaches the 1.80V output, enabling dropout operation. In this state, the internal high-side P-channel MOSFET remains fully enhanced (non-switching), and regulation depends on the voltage drop across its RDS(ON) (0.18Ω typ at 3.6V input) plus the inductor's DC resistance. This capability allows the MAX1572ETC180 to maintain regulation down to VIN ≈ VOUT + IOUT × (RDS(ON)P + RL), extending usable battery range in portable applications.
What external components are required for basic operation of the MAX1572ETC180?
For basic operation, the MAX1572ETC180 requires only five external components: a 2.2µH power inductor between LX and VOUT, a 10µF ceramic output capacitor from OUT to GND, a 10µF ceramic input capacitor from BATT to GND, a 1000pF soft-start capacitor from SS to GND, and a 10Ω resistor plus 0.1µF capacitor forming an RC filter from BATT to ABATT. No external Schottky diode is needed due to the integrated synchronous rectifier - a key BOM-reduction feature of the MAX1572ETC180 design.
MAX1572ETC180 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)
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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