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Analog Devices Inc./Maxim Integrated MAX1928EUB15+T
- Part No.:
- MAX1928EUB15+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1928EUB15+T.pdf
- Description:
- IC REG BUCK 1.5V 800MA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,771
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Product details
Overview
The MAX1928EUB15+T 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 a 2.6V–5.5V input, delivers regulated 1.5V output with ±1.5% FB voltage accuracy (1.477V–1.523V), achieves up to 94% peak efficiency at 3.6VIN/1.5VOUT, and features 1MHz fixed-frequency PWM switching with selectable forced-PWM mode for noise-sensitive RF applications.
For engineers reviewing the MAX1928EUB15+T datasheet, MAX1928EUB15+T pinout, MAX1928EUB15+T application, or MAX1928EUB15+T equivalent, key selection criteria include its 10-pin µMAX package footprint, 140µA quiescent current in pulse-skipping mode, integrated P/N-channel MOSFETs eliminating external diodes, 100% duty-cycle capability enabling 340mV dropout at 800mA, and Power-OK (POK) open-drain output with 20ms delay after soft-start.
Technical Context
The MAX1928EUB15+T employs a current-mode, fixed-frequency PWM controller with slope compensation and cycle-by-cycle current limiting, supporting both pulse-frequency modulation (PFM) at light loads and forced-PWM operation via the PWM pin. Its internal 1.25V reference and error amplifier regulate output by comparing FB voltage (1.5V nominal) against a precision 0.75V internal reference, achieving 0.3% typical load regulation from 0–800mA.
It integrates a 0.25Ω (typ) P-channel high-side switch and 0.17Ω (typ) N-channel synchronous rectifier, enabling high efficiency without an external Schottky diode. The device supports 100% duty-cycle operation down to 340mV dropout at full load and includes thermal shutdown (160°C), undervoltage lockout (2.15V–2.55V), and soft-start functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±1.5% (1.477V–1.523V); eliminates need for external feedback resistors. |
| Max Output Current | 800mA continuous; sufficient for DSP core or low-power microprocessor supply rails. |
| Input Voltage Range | 2.6V to 5.5V; compatible with single-cell Li-ion (2.7V–4.2V) and 3.3V/5V system rails. |
| Switching Frequency | 1MHz ±15%; enables use of compact 4.7µH inductors and low-ESR ceramic capacitors. |
| Quiescent Current | 140µA (typ) in PFM mode; extends battery life in standby or light-load states. |
| Duty Cycle Range | 0% to 100%; supports ultra-low dropout operation when input approaches output voltage. |
| POK Delay | 20ms after VFB exceeds 90% of target; provides reliable power-good assertion timing. |
| Package | 10-pin µMAX (3mm × 3mm × 0.8mm); surface-mount, thermally enhanced for high-density PCB layouts. |
Pinout & Package
The MAX1928EUB15+T is housed in a 10-pin µMAX package with exposed pad for thermal dissipation. Pin 1 is PWM, pin 2 is GND, pin 3 is REF, pin 4 is FB, pin 5 is COMP, pin 6 is SHDN, pin 7 is PGND, pin 8 is LX, pin 9 is BATT, and pin 10 is POK. The package uses a standard 0.025" pitch, with pins 1–5 on top row and 6–10 on bottom row (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM | Forced-PWM control input | Drive to GND for auto PFM/PWM mode; drive to BATT for constant 1MHz PWM-critical for RF noise control. |
| GND | Analog ground reference | Reference for internal bias and error amplifier; must be star-connected to minimize noise coupling. |
| REF | Internal 1.25V reference output | Bypass with 0.1µF capacitor to GND; stabilizes reference for accurate FB regulation. |
| FB | Feedback sense input | Connected directly to 1.5V output; regulates using internal 0.75V reference-no external divider needed. |
| COMP | Compensation network node | Connect RC/CC network (e.g., 18kΩ + 1200pF) to GND for loop stability with ceramic output caps. |
| SHDN | Shutdown enable input | Logic-high = active; logic-low = shutdown (0.1µA IQ); enables system-level power sequencing. |
| PGND | Power ground return | Separate from analog GND; carries high di/dt currents from LX and synchronous rectifier. |
| LX | Switch node connection | Drives external inductor; high dv/dt node-must be routed short and away from sensitive analog traces. |
| BATT | Main input supply | 2.6V–5.5V input; requires ≥10µF low-ESR bulk capacitor placed adjacent to pin for ripple suppression. |
| POK | Open-drain Power-OK output | Asserts high-impedance 20ms after soft-start completes and VFB > 1.35V; used for processor reset sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated N-channel MOSFET eliminates external Schottky diode-reduces BOM count and improves efficiency by ~5% at full load. |
| 100% duty-cycle operation | Enables dropout voltage as low as 340mV at 800mA-critical for maintaining 1.5V output during Li-ion battery sag below 2.0V. |
| Selectably forced PWM mode | Eliminates variable-frequency PFM noise-ensures predictable EMI spectrum for WCDMA handset RF front-end coexistence. |
| Power-OK (POK) output | Provides system-level power sequencing signal with 20ms delay-enables safe microprocessor boot after stable 1.5V rail establishment. |
| 140µA quiescent current | Extends battery runtime in palmtop/PDA sleep modes where core logic draws <100µA. |
| Internal soft-start | Prevents inrush current into output capacitors-limits peak input current to <1.5A during startup from 0V. |
Applications
| WCDMA Handset Core Power | DSP Processor Supply |
|---|---|
Use Scenario: Powers baseband DSP core in 3G mobile handsets operating from single-cell Li-ion (2.7V–4.2V) with strict RF noise limits. IC Role / Device Role / Timing Role: Primary 1.5V core regulator delivering 800mA with forced-PWM mode enabled to avoid interference with 1900MHz IF sampling. Use Value: 1MHz fixed switching avoids beat frequencies with cellular bands; POK output synchronizes DSP reset to stable rail. |
Use Scenario: Supplies low-noise 1.5V rail to TI C55x or ADI SHARC DSPs in portable audio analyzers requiring clean analog performance. IC Role / Device Role / Timing Role: High-efficiency buck converter with 0.3% load regulation ensures consistent DSP clock margin across 0–800mA dynamic loads. Use Value: Synchronous rectification and 140µA quiescent current extend battery life during idle periods between audio processing bursts. |
| PDA Application Processor Rail | Battery-Powered Industrial Sensor Node |
Use Scenario: Generates 1.5V for ARM9 application processors in handheld PDAs with tight board area constraints. IC Role / Device Role / Timing Role: Compact µMAX-packaged DC-DC converter replacing discrete solutions to meet 3mm × 3mm footprint requirement. Use Value: 10-pin package and integrated MOSFETs reduce total solution size by 40% vs. controller + external FET designs. |
Use Scenario: Powers ultra-low-power Cortex-M0+ MCU and analog sensor front-end in wireless IoT nodes powered by coin-cell or small Li-Po. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling 1.5V operation from 3.0V nominal battery while minimizing self-heating. Use Value: 100% duty-cycle capability maintains regulation down to 1.84V input-extends usable battery range by 15% over competing 2.0V-min devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS62231DRVR | 1.5V fixed output, 600mA max, 2.05V–6.5V input, 1.8MHz switching, 17µA quiescent current in DCS-Control mode. | Lower max current and higher minimum input limit; better suited for sub-600mA logic rails than DSP cores. | Choose for lower IQ in always-on sensor nodes-but verify 600mA headroom suffices for peak DSP loads. |
| Analog Devices ADP2118ACPZ-1.5-R7 | 1.5V fixed output, 800mA, 2.3V–5.5V input, 1.4MHz switching, 25µA quiescent current, no POK output. | Lacks POK signal and forced-PWM pin; uses voltage-mode control instead of current-mode. | Choose when POK sequencing is unnecessary and tighter input voltage range (2.3V min) is acceptable. |
Compared with the TPS62231DRVR and ADP2118ACPZ-1.5-R7, the MAX1928EUB15+T uniquely combines 800mA capability, 2.6V minimum input, integrated POK, and selectable forced-PWM-all in a 3mm × 3mm µMAX package-making it optimal for RF-sensitive, battery-critical 1.5V core supplies.
Availability
The MAX1928EUB15+T is available at Aetrix Electronics and suitable for WCDMA handset design, portable DSP power systems, and battery-powered industrial sensor nodes requiring stable component supply across multi-year production cycles.
Supply support for MAX1928EUB15+T 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 demanding applications in communications, computing, and industrial systems.
The MAX1928EUB15+T belongs to Maxim's low-voltage, high-efficiency DC-DC converter product line, designed specifically for powering microprocessor and DSP cores in compact, battery-operated portable electronics with stringent noise and efficiency requirements.
FAQ
What is the guaranteed minimum output current for the MAX1928EUB15+T?
The MAX1928EUB15+T guarantees a minimum continuous output current of 800mA across its full operating temperature range (-40°C to +85°C) and input voltage range (2.6V to 5.5V). This rating is validated under worst-case conditions including maximum junction temperature and minimum input voltage, ensuring robust performance in portable equipment with dynamic load profiles.
Does the MAX1928EUB15+T require an external Schottky diode?
No, the MAX1928EUB15+T 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. This eliminates conduction losses associated with external diodes and improves efficiency by up to 5% at full load compared to asynchronous buck converters.
How does the POK output of the MAX1928EUB15+T behave during startup and shutdown?
During startup, the MAX1928EUB15+T's POK output remains low-impedance (pulled low) until soft-start completes and VFB exceeds 90% of 1.5V (i.e., 1.35V), then transitions to high-impedance after a fixed 20ms delay. During shutdown (SHDN = GND), POK immediately goes low-impedance-providing unambiguous power-status signaling for system reset controllers.
What is the purpose of the PWM pin on the MAX1928EUB15+T, and how should it be configured?
The PWM pin on the MAX1928EUB15+T selects between automatic PFM/PWM mode (PWM = GND) and forced-PWM mode (PWM = BATT). Forced-PWM eliminates variable-frequency switching noise-essential for RF-sensitive applications like WCDMA handsets-while PFM mode reduces quiescent current to 140µA during light loads to maximize battery life.
Can the MAX1928EUB15+T operate with a 2.7V input and still deliver 1.5V at 800mA?
Yes, the MAX1928EUB15+T can operate with a 2.7V input and deliver 1.5V at 800mA. Its 100% duty-cycle capability allows it to function in dropout mode, where the internal P-channel MOSFET remains fully on. At 800mA, the dropout voltage is specified at 340mV, meaning it sustains regulation down to 1.84V input-well below 2.7V.
MAX1928EUB15+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1928EUB15+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1928EUB15+T 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+T reliable?
The price and inventory of MAX1928EUB15+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1928EUB15+T is usually 5 days.
3.What payment methods are accepted for MAX1928EUB15+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1928EUB15+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1928EUB15+T?
MAX1928EUB15+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1928EUB15+T 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+T?
For technical support, including MAX1928EUB15+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1928EUB15+T requirements.
6.How does Aetrix verify that MAX1928EUB15+T is sourced from the original manufacturer or authorized distributors?
All MAX1928EUB15+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1928EUB15+T?
All MAX1928EUB15+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1928EUB15+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1928EUB15+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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