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Analog Devices Inc./Maxim Integrated MAX1928EUB15+
- Part No.:
- MAX1928EUB15+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1928EUB15+.pdf
- Description:
- IC REG BUCK 1.5V 800MA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:513
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Product details
Overview
MAX1928EUB15+ from Maxim Integrated is a 1.5V fixed-output, 800mA synchronous step-down DC-DC converter optimized for low-voltage microprocessor core power in space-constrained portable equipment. It operates from 2.6V to 5.5V input, delivers 1.5V ±2.3% output accuracy at up to 800mA, features 1MHz fixed-frequency PWM switching, and achieves 140µA quiescent current in pulse-skipping mode - enabling high efficiency in WCDMA handsets and battery-powered DSP systems.
For engineers reviewing the MAX1928EUB15+ datasheet, MAX1928EUB15+ pinout, MAX1928EUB15+ application, or MAX1928EUB15+ equivalent, key selection criteria include guaranteed 800mA output at 1.5V, 100% duty-cycle dropout capability (340mV @ 800mA), integrated P/N-channel MOSFETs eliminating external diodes, POK output with 20ms delay, and µMAX-10 package compatibility with tight PCB layouts.
Technical Context
The MAX1928EUB15+ employs a current-mode, fixed-frequency PWM controller with selectable forced-PWM operation to suppress noise across all load conditions. Its internal 1.25V reference and 0.75V FB regulation voltage enable precise 1.5V output via direct FB-to-VOUT connection, while the transconductance error amplifier (210µS) and slope compensation ensure stability with small ceramic output capacitors.
It integrates a 0.4Ω P-channel high-side switch and 0.3Ω N-channel synchronous rectifier, supporting 100% duty-cycle operation down to 340mV dropout at full load. The device uses pulse-frequency modulation (PFM) below ~130mA to minimize quiescent current, then transitions seamlessly to 1MHz PWM above that threshold - maintaining <0.3% load regulation from 0 to 800mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±2.3% (1.477V–1.523V) - enables direct core supply for 1.5V logic without external feedback resistors. |
| Max Output Current | 800mA continuous - sufficient for low-power DSP cores and ARM-based application processors. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), Li-polymer, and regulated 3.3V/5V rails. |
| Switching Frequency | 1MHz ±15% - allows use of compact 4.7µH inductors and low-ESR ceramic capacitors. |
| Quiescent Current | 140µA (typ) in PFM mode - extends battery life in standby and light-load states. |
| Duty Cycle Range | 0% to 100% - supports ultra-low dropout operation; 340mV dropout voltage at 800mA enables operation near battery end-of-discharge. |
| POK Delay | 20ms after VFB exceeds 90% of target - provides reliable power-good assertion for system sequencing. |
Pinout & Package
MAX1928EUB15+ is housed in a 10-pin µMAX package (3.0mm × 3.0mm × 0.8mm, 0.5mm pitch), optimized for high-density portable PCB layouts. The thermally enhanced PGND pin and separate analog/digital ground paths support stable regulation under dynamic load transients.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PWM | Forced-PWM control input | Drive to BATT to enforce fixed-frequency PWM (lower noise); drive to GND for automatic PFM/PWM transition (higher light-load efficiency). |
| 2 - GND | Analog ground reference | Low-impedance return for REF, FB, COMP; must be star-connected to PGND at single point to avoid noise coupling. |
| 3 - REF | Internal 1.25V reference output | Bypass with 0.1µF capacitor to GND; supplies bias for error amplifier and POK comparator. |
| 4 - FB | Feedback sense input | Connected directly to VOUT for 1.5V fixed operation; regulates at 0.75V internal reference point. |
| 5 - COMP | Compensation node | External RC network (e.g., 18kΩ + 1200pF) sets loop stability and transient response for ceramic output caps. |
| 6 - SHDN | Shutdown control | Logic-high enables operation; logic-low reduces supply current to 0.1µA and places output in high-impedance state. |
| 7 - PGND | Power ground return | High-current return path for LX, BATT, and synchronous rectifier; must be routed separately from AGND and tied at single point. |
| 8 - LX | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace and careful EMI containment. |
| 9 - BATT | Main power input | 2.6V–5.5V supply; requires ≥10µF low-ESR bulk capacitor placed adjacent to pin to minimize input ripple and EMI. |
| 10 - POK | Open-drain power-good output | Asserts high-impedance 20ms after soft-start completes and VFB reaches 90% of 1.5V - used for processor reset or system enable sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N-channel MOSFET eliminates external Schottky diode - improves efficiency by ~5–8% and reduces thermal footprint. |
| 100% duty-cycle operation | Enables dropout voltage as low as 340mV at 800mA - sustains regulation during battery voltage sag in handheld devices. |
| Selectable forced PWM | Eliminates variable-frequency PFM noise - critical for RF-sensitive applications like WCDMA transceivers and ADC reference supplies. |
| Internal soft-start | Controls output ramp rate to prevent inrush current - avoids input rail collapse and ensures clean power-up of downstream logic. |
| Power-OK (POK) output | Provides sequenced, delay-qualified system readiness signal - simplifies FPGA/CPU power management without external monitoring ICs. |
Applications
| WCDMA Handsets | DSP Core Power |
|---|---|
Use Scenario: Primary core voltage supply for baseband processors in 3G mobile handsets operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Step-down regulator delivering stable 1.5V at up to 800mA with fast transient response to burst-mode processing loads. Use Value: 140µA quiescent current extends standby time; 1MHz switching minimizes inductor size; POK enables safe processor boot sequence. |
Use Scenario: Dedicated power rail for low-voltage DSP cores requiring tight output tolerance and minimal noise coupling. IC Role / Device Role / Timing Role: Fixed 1.5V buck converter with forced-PWM mode enabled to suppress switching noise near analog signal paths. Use Value: Synchronous rectification achieves >90% peak efficiency; 0.3% load regulation maintains core voltage stability across dynamic workloads. |
| PDA / Palmtop Systems | Battery-Powered Equipment |
Use Scenario: Main SoC core supply in compact PDAs with limited board area and aggressive battery life targets. IC Role / Device Role / Timing Role: High-efficiency 1.5V regulator using PFM at idle and PWM under active load - adaptive to varying compute demand. Use Value: µMAX-10 package fits tight layouts; 100% duty cycle supports operation down to 2.85V input - maximizes usable battery capacity. |
Use Scenario: General-purpose 1.5V rail for portable instrumentation, medical sensors, or handheld test gear powered by AA/AAA or Li-ion cells. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC solution with integrated MOSFETs and POK signaling for autonomous system control. Use Value: No external diode required reduces BOM count; shutdown current <1µA enables long-term storage without battery drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.5V fixed, 800mA, 3MHz switching, 17µA IQ - higher frequency enables smaller passives but lower max input (5.5V same); no POK output. | Lacks power-good signaling; better suited for ultra-compact designs where POK is not required and higher-frequency noise can be filtered. | Choose TPS62231DRYR when board space is more constrained than sequencing complexity, and system-level POK is handled externally. |
| RT8059NGSP | 1.5V fixed, 800mA, 1.5MHz, 25µA IQ, integrated POK - different pinout (8-pin MSOP), higher min input (2.7V), no forced-PWM option. | Requires PCB redesign due to non-compatible pin mapping; lacks selectable PWM mode, limiting noise control in RF sections. | Choose RT8059NGSP only if POK functionality is mandatory and layout revision is acceptable; verify 2.7V min input compatibility with battery profile. |
Compared with TPS62231DRYR and RT8059NGSP, the MAX1928EUB15+ uniquely combines POK output, forced-PWM selection, and 100% duty-cycle operation in a µMAX-10 package - making it optimal for battery-powered systems requiring both sequencing integrity and RF-noise immunity.
Availability
MAX1928EUB15+ is available at Aetrix Electronics and suitable for WCDMA handset design, DSP core power delivery, and portable medical instrumentation requiring stable component supply, long-lifecycle availability, and guaranteed parametric compliance.
Supply support for MAX1928EUB15+ 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 MAX1927/MAX1928 family was designed specifically for ultra-compact, high-efficiency core voltage regulation in battery-powered portable electronics - emphasizing low quiescent current, small external components, and robust light-load behavior.
FAQ
What is the guaranteed output voltage accuracy of the MAX1928EUB15+?
The MAX1928EUB15+ guarantees output voltage accuracy of ±2.3% over temperature (–40°C to +85°C) and line/load conditions, corresponding to 1.477V to 1.523V at the FB pin. This is achieved via factory-trimmed internal reference and error amplifier, with no external resistor calibration required for fixed 1.5V operation.
Does the MAX1928EUB15+ require an external Schottky diode?
No, the MAX1928EUB15+ does not require an external Schottky diode. It integrates both a P-channel high-side switch and an N-channel synchronous rectifier, enabling full synchronous rectification and eliminating conduction losses and thermal overhead associated with discrete diodes.
How does the POK output of the MAX1928EUB15+ behave during startup and shutdown?
During startup, the MAX1928EUB15+ POK output remains low-impedance until soft-start completes and VFB exceeds 90% of 1.5V (1.35V), then transitions to high-impedance after a 20ms delay. During shutdown (SHDN = GND), POK immediately goes low-impedance - providing unambiguous power-fail signaling.
What is the minimum input voltage required for the MAX1928EUB15+ to maintain regulation at full 800mA load?
The MAX1928EUB15+ maintains regulation at 800mA down to an input voltage of 1.84V (1.5V + 340mV dropout), assuming typical on-resistance. However, undervoltage lockout disables operation below 2.15V (rising threshold), so functional operation begins at 2.15V - with dropout behavior dominating only near the UVLO boundary.
Can the MAX1928EUB15+ operate in forced-PWM mode with zero load current?
Yes, the MAX1928EUB15+ supports forced-PWM operation at zero load. When PWM is tied to BATT, the synchronous rectifier actively sinks reverse inductor current, enabling stable 1MHz switching even with no output load - unlike PFM mode which would cease switching entirely.
MAX1928EUB15+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- 800kHz ~ 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX1928EUB15+ FAQ
1.How can I place an order for MAX1928EUB15+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1928EUB15+ 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 MAX1928EUB15+ reliable?
The price and inventory of MAX1928EUB15+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1928EUB15+ is usually 5 days.
3.What payment methods are accepted for MAX1928EUB15+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1928EUB15+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1928EUB15+?
MAX1928EUB15+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1928EUB15+ 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 MAX1928EUB15+?
For technical support, including MAX1928EUB15+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1928EUB15+ requirements.
6.How does Aetrix verify that MAX1928EUB15+ is sourced from the original manufacturer or authorized distributors?
All MAX1928EUB15+ 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 MAX1928EUB15+ meets industry standards.
7.What is the process for return or replacement of MAX1928EUB15+?
All MAX1928EUB15+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1928EUB15+, 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 MAX1928EUB15+ part is unused and in its original packaging.
Return procedure for MAX1928EUB15+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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