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Analog Devices Inc./Maxim Integrated MAX1572ETC150+
- Part No.:
- MAX1572ETC150+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1572ETC150+.pdf
- Description:
- IC REG BUCK 1.5V 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:962
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Product details
Overview
MAX1572ETC150+ from Maxim Integrated is a fixed-frequency, synchronous step-down DC-DC converter optimized for powering 1.50V microprocessor/DSP cores in space-constrained portable electronics. It delivers 800mA guaranteed output current from a 2.6V–5.5V input, operates at 2MHz switching frequency, achieves up to 97% efficiency, and integrates a 170ms (min) active-low RESET output with internal pullup to OUT.
For engineers reviewing the MAX1572ETC150+ datasheet, MAX1572ETC150+ pinout, MAX1572ETC150+ application, or MAX1572ETC150+ equivalent, key selection criteria include its preset 1.50V output, pulse-group/pulse-skip/forced-PWM mode flexibility, 48µA quiescent current in light-load operation, and compatibility with tiny 2.2µH inductors and 10µF ceramic capacitors.
Technical Context
The MAX1572ETC150+ uses a 2MHz fixed-frequency current-mode PWM control architecture with internal slope compensation to ensure loop stability and eliminate inductor staircasing. Its dual-MOSFET synchronous rectification-featuring P-channel high-side (0.18Ω typ @ 3.6V) and N-channel low-side switches-eliminates external diode requirements and maximizes efficiency across load range.
Voltage positioning enables precise load-transient response by correlating output droop with load step changes, reducing total output voltage variation by 50% versus conventional regulators. The device supports three selectable operating modes via EN1/EN2 logic inputs: pulse-group (48µA IQ), pulse-skip (faster transient recovery), and forced-PWM (predictable EMI spectrum).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 1.50V ±2% (voltage-positioning enabled); eliminates external feedback resistor network. |
| Max Output Current | 800mA continuous; sufficient for ARM9/ARM11 core rails in smartphones and handheld instruments. |
| Switching Frequency | 2MHz (1.8–2.2MHz range); enables use of 2.2µH inductor and compact 10µF ceramic output capacitor. |
| Quiescent Current | 48µA typical in pulse-group mode; extends battery life in standby states of portable devices. |
| RESET Delay | 170ms minimum after VOUT reaches 90% of nominal; provides reliable power-on reset timing for microcontrollers. |
| Input Voltage Range | 2.6V to 5.5V; compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, and dual-cell NiMH batteries. |
| Shutdown Current | 0.1µA typical; ensures near-zero leakage during system sleep or off-state. |
Pinout & Package
MAX1572ETC150+ 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 1.50V for ≥170ms; internal 14kΩ pullup to OUT enables direct MCU reset without external components. |
| 2 (SS) | Soft-start control | Connects to GND via capacitor (e.g., 1000pF) to linearly ramp output voltage and prevent inrush current at startup. |
| 3, 5, 11 (GND) | Analog/digital ground | Must be connected to exposed paddle and low-impedance ground plane; separates signal reference from power return paths. |
| 4 (OUT) | Output voltage sense input | Direct connection to regulated output node; internal discharge path to GND during shutdown prevents floating bias. |
| 6 (EN2), 10 (EN1) | Mode-select enable inputs | Logic-controlled interface (Table 1) selecting shutdown, pulse-group, pulse-skip, or forced-PWM operation. |
| 7 (PGND) | Power ground | High-current return path for LX switch node; requires low-inductance connection to exposed paddle. |
| 8 (LX) | Switch-node connection | Drives external 2.2µH inductor; high-impedance in shutdown; internal clamp diodes protect against inductive kickback. |
| 9 (BATT) | Main input supply | Accepts 2.6–5.5V; requires local 10µF ceramic bypass capacitor to minimize high-frequency noise and supply impedance. |
| 12 (ABATT) | Analog supply filter input | Connected via 10Ω resistor and 0.1µF capacitor to BATT; isolates sensitive analog circuitry from power rail noise. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external Schottky diode; reduces conduction loss and board area while enabling >97% peak efficiency. |
| Voltage-positioning load regulation | Matches output droop to load transients, halving total output voltage deviation and eliminating overshoot on load removal. |
| Three selectable power-save modes | Pulse-group (48µA IQ), pulse-skip (lower ripple, faster transient), forced-PWM (EMI-controlled 2MHz operation). |
| Integrated 170ms RESET timer | Provides deterministic power-on reset timing referenced directly to regulated output voltage-not input rail-ensuring robust MCU initialization. |
| 100% duty-cycle capability | Enables dropout operation down to (VOUT + IOUT × RDS(ON)P); supports high-efficiency LDO-like behavior near VIN ≈ VOUT. |
Applications
| Smartphone Core Power | Digital Camera Baseband |
|---|---|
|
Use Scenario: Supplying 1.50V core voltage to application processors (e.g., Qualcomm Snapdragon S1/S2 derivatives) in slim-profile smartphones with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 800mA core rail with fast transient response to CPU burst loads. Use Value: Pulse-group mode extends standby battery life; voltage positioning prevents overvoltage during processor clock scaling transitions. |
Use Scenario: Powering baseband DSP cores in digital cameras and camcorders requiring low-noise, tightly regulated 1.50V supply during image capture and video encoding. IC Role / Device Role / Timing Role: High-efficiency step-down converter with forced-PWM mode selected to suppress switching noise near analog image sensor circuits. Use Value: 2MHz operation confines EMI to >100MHz band, avoiding interference with IF stages and ADC sampling clocks. |
| Handheld Medical Instrument | PCMCIA Card Power Management |
|
Use Scenario: Providing 1.50V logic supply for low-power ARM Cortex-M3/M4 microcontrollers in battery-operated handheld diagnostic tools. IC Role / Device Role / Timing Role: Compact DC-DC solution meeting stringent size constraints and long operational runtime requirements. Use Value: 48µA quiescent current in pulse-group mode enables multi-week shelf life; integrated RESET ensures safe boot after battery insertion. |
Use Scenario: Regulating 1.50V I/O and core voltage for PCMCIA Type II cards in industrial PDAs and legacy notebook expansion slots. IC Role / Device Role / Timing Role: Single-chip buck converter replacing discrete solutions to meet JEDEC MO-220 QFN footprint compliance. Use Value: 4mm × 4mm thin QFN package fits within tight card-edge height limits; 12-pin layout simplifies routing on double-sided card PCBs. |
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 | Fixed 1.5V output, 800mA, 3MHz switching, 22µA IQ; no integrated RESET output. | Lacks power-on reset functionality; requires external supervisor IC for MCU reset sequencing. | Preferred where ultra-low IQ and higher switching frequency justify added component count and cost. |
| RT8059NGQW | Adjustable 0.6–3.3V output, 800mA, 2MHz, 50µA IQ; includes RESET but with 200ms min delay and external threshold setting. | Requires external resistors to set 1.50V output and RESET threshold; less integrated than MAX1572ETC150+. | Chosen when design requires flexible output voltage or custom reset threshold not supported by preset variants. |
Compared with TPS62231DRYR and RT8059NGQW, the MAX1572ETC150+ offers tighter integration-combining preset 1.50V regulation, 170ms RESET referenced to VOUT, and three selectable power-save modes-reducing BOM count and layout complexity in space- and battery-life-sensitive portable designs.
Availability
MAX1572ETC150+ is available at Aetrix Electronics and suitable for smartphone core power, digital camera baseband supplies, handheld medical instrumentation, PCMCIA card power management, and portable test equipment requiring stable component supply and long-term lifecycle support.
Supply support for MAX1572ETC150+ 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 industrial, communications, and consumer applications.
The MAX1572 series was designed specifically for high-efficiency, low-noise, space-constrained DC-DC conversion in battery-powered portable electronics-emphasizing integration, light-load efficiency, and system-level features like voltage positioning and integrated RESET.
FAQ
What is the exact output voltage of the MAX1572ETC150+?
The MAX1572ETC150+ has a factory-preset output voltage of 1.50V, with accuracy of ±2% over temperature and load (–40°C to +85°C, 100mA–800mA). This value is laser-trimmed during production and does not require external feedback resistors. The top-mark "AABX" on the package confirms the 1.50V variant. The MAX1572ETC150+ maintains this regulation using voltage-positioning architecture to dynamically adjust output based on load current.
Does the MAX1572ETC150+ require an external diode?
No, the MAX1572ETC150+ does not require an external Schottky diode. It integrates both a P-channel high-side MOSFET and an N-channel synchronous rectifier, enabling full synchronous rectification. This internal topology eliminates conduction losses associated with external diodes, improves efficiency-especially at light loads-and reduces component count and PCB area. The datasheet explicitly states "No external Schottky diode required" as a key feature of the MAX1572ETC150+.
How is the RESET function timed and what triggers it on the MAX1572ETC150+?
The RESET output on the MAX1572ETC150+ is an active-low, open-drain signal with internal 14kΩ pullup to the OUT pin. It asserts low for a minimum of 170ms after VOUT rises above 90% of its nominal 1.50V output. It reasserts low if VOUT drops below that 90% threshold during operation. The timing is internally generated and referenced solely to the regulated output-not the input rail-ensuring reliable reset assertion even under brownout conditions. This behavior is confirmed in the Electrical Characteristics table and Typical Operating Characteristics waveform MAX1572toc11.
Which operating mode should be used for lowest quiescent current with the MAX1572ETC150+?
Pulse-group mode delivers the lowest quiescent current for the MAX1572ETC150+, with a typical value of 48µA at light loads. This mode is selected by setting EN1 = GND and EN2 = BATT (per Table 1 in the datasheet). In pulse-group mode, the MAX1572ETC150+ shuts down most internal circuitry when VOUT exceeds +0.8% of regulation, significantly reducing static power consumption compared to pulse-skip (700µA typ) or forced-PWM (>1mA) modes-making it ideal for battery-backed standby applications.
Can the MAX1572ETC150+ operate with input voltage close to its 1.50V output?
Yes, the MAX1572ETC150+ supports 100% duty-cycle operation, allowing it to maintain regulation when the input voltage approaches the 1.50V output. In this state, the internal P-channel high-side MOSFET remains fully on, and dropout is determined only by IOUT × (RDS(ON)P + inductor DCR). At 300mA load and 3.6V input, RDS(ON)P is 0.18Ω (typ), yielding ~54mV dropout-enabling efficient operation in near-LDO scenarios without external components. This capability is explicitly documented in the Detailed Description section of the MAX1572ETC150+ datasheet.
MAX1572ETC150+ 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):
- 1.5V
- 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)
MAX1572ETC150+ FAQ
1.How can I place an order for MAX1572ETC150+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1572ETC150+ 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 MAX1572ETC150+ reliable?
The price and inventory of MAX1572ETC150+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1572ETC150+ is usually 5 days.
3.What payment methods are accepted for MAX1572ETC150+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1572ETC150+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1572ETC150+?
MAX1572ETC150+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1572ETC150+ 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 MAX1572ETC150+?
For technical support, including MAX1572ETC150+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1572ETC150+ requirements.
6.How does Aetrix verify that MAX1572ETC150+ is sourced from the original manufacturer or authorized distributors?
All MAX1572ETC150+ 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 MAX1572ETC150+ meets industry standards.
7.What is the process for return or replacement of MAX1572ETC150+?
All MAX1572ETC150+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1572ETC150+, 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 MAX1572ETC150+ part is unused and in its original packaging.
Return procedure for MAX1572ETC150+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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