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Analog Devices Inc./Maxim Integrated MAX1927REUB+T
- Part No.:
- MAX1927REUB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1927REUB+T.pdf
- Description:
- IC REG BUCK ADJ 800MA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,842
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Product details
Overview
MAX1927REUB+T from Maxim Integrated is a high-efficiency, adjustable-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 output down to 0.75V, features 1MHz fixed-frequency PWM switching, 140µA quiescent current in pulse-skipping mode, and integrated P/N-channel MOSFETs enabling 100% duty-cycle operation with only 340mV dropout at full load.
For engineers reviewing the MAX1927REUB+T datasheet, MAX1927REUB+T pinout, MAX1927REUB+T application, or MAX1927REUB+T equivalent, key selection considerations include its adjustable 0.75V–5V output range, synchronous rectification eliminating external diodes, selectable forced-PWM mode for RF-sensitive designs, Power-OK (POK) monitoring, and compact 10-pin µMAX package footprint.
Technical Context
The MAX1927REUB+T employs a current-mode, fixed-frequency PWM controller with slope compensation and cycle-by-cycle current limiting, supporting both PFM (light-load) and forced-PWM (noise-critical) operating modes. Its internal 1.25V reference and 0.75V FB regulation voltage enable precise output adjustment via external resistor divider.
It integrates a 0.25Ω (typ) P-channel high-side switch and 0.17Ω (typ) N-channel synchronous rectifier, delivering up to 800mA while maintaining high efficiency across load and input voltage ranges. The device includes undervoltage lockout (2.35V typ), soft-start, thermal shutdown (160°C), and an open-drain POK output with 20ms delay after regulation is achieved.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 800mA continuous; supports peak loads up to 1.1A before current-limit activation. |
| Input Voltage Range | 2.6V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V), Li-polymer, and 3.3V/5V system rails. |
| Adjustable Output Range | 0.75V to 5V - set via external resistor divider on FB pin; 0.75V regulation threshold enables ultra-low-core-voltage support. |
| Switching Frequency | 1MHz (±15%) - enables use of small, low-profile inductors (e.g., 4.7µH) and ceramic capacitors. |
| Quiescent Current | 140µA (typ) in pulse-skipping mode - extends battery life in standby; rises to 2mA in forced-PWM mode. |
| Dropout Voltage | 340mV at 800mA - achieved via 100% duty-cycle operation using integrated low-RDS(ON) MOSFETs. |
| Package | 10-pin µMAX (3mm × 3mm, 0.8mm height) - thermally enhanced exposed-pad variant for efficient PCB heat dissipation. |
Pinout & Package
The MAX1927REUB+T is housed in a 10-pin µMAX package with exposed thermal pad (pin 7 = PGND). Pin 1 is PWM control, pin 4 is FB (feedback), pin 6 is SHDN (active-high shutdown), and pin 10 is open-drain POK (power-good) output. All pins are surface-mount, lead-free, and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM | Mode select input | Drive to GND for auto PFM/PWM; drive to BATT for forced-PWM-only operation - critical for noise-sensitive RF/data-acquisition systems. |
| GND | Analog ground | Reference for internal error amplifier and bias circuitry; must be star-connected near REF and FB to minimize noise coupling. |
| REF | Internal 1.25V reference output | Bypass with 0.1µF capacitor to GND; supplies precision reference for feedback loop and POK comparator. |
| FB | Feedback sense input | Regulates output to 0.75V; connects to center of external R1/R2 divider - sets VOUT = 0.75V × (1 + R1/R2). |
| COMP | Compensation node | Connects external RC network (e.g., 15kΩ + 680pF) to GND for loop stability; integrates transimpedance amplifier output. |
| SHDN | Shutdown control | Active-high logic input; pulls internal reference and switches off at <0.6V; draws only 0.1µA in shutdown. |
| PGND | Power ground | High-current return path for LX and synchronous rectifier; must be connected directly to exposed thermal pad for thermal and EMI performance. |
| LX | Switch node | Connects to inductor; carries high dv/dt switching waveform - requires short, wide trace and separation from sensitive analog nodes. |
| BATT | Main supply input | Accepts 2.6–5.5V; requires ≥10µF low-ESR bulk capacitor placed adjacent to pin for input ripple suppression. |
| POK | Power-OK open-drain output | Asserts high-impedance 20ms after VFB exceeds 90% of target - used for processor reset sequencing and system power validation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates need for external Schottky diode, improving efficiency by ~5–10% and reducing board area and thermal stress. |
| Selectably forced PWM mode | Enables deterministic 1MHz switching under all load conditions - essential for avoiding beat frequencies in WCDMA/UMTS RF front-ends. |
| 100% duty-cycle capability | Supports ultra-low dropout operation (e.g., 3.3V→3.0V at 800mA) without loss of regulation, extending usable battery voltage range. |
| Integrated soft-start | Prevents inrush current and output overshoot during power-up; eliminates need for external timing components. |
| Power-OK (POK) monitor | Provides system-level power integrity verification with programmable delay - simplifies reset IC integration in handheld applications. |
Applications
| WCDMA Handsets | DSP Core Power |
|---|---|
Use Scenario: Primary core voltage regulator for baseband processors in 3G mobile handsets operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Synchronous buck converter providing dynamically scalable 1.0–1.8V core supply with fast transient response to CPU load changes. Use Value: Delivers >85% efficiency at 500mA load with 3.6V input, minimizing thermal rise in sealed handset enclosures while meeting stringent RF emission limits via forced-PWM mode. | Use Scenario: Dedicated low-noise power rail for digital signal processor cores requiring stable sub-1.2V supply with minimal voltage ripple. IC Role / Device Role / Timing Role: Adjustable step-down regulator supplying 0.9V–1.2V DSP core voltage with tight line/load regulation (0.3% typ) and low 10mVPP output ripple. Use Value: Enables reliable high-speed DSP operation by maintaining regulation during rapid current transients (e.g., FFT bursts), supported by 1MHz bandwidth and synchronous rectifier zero-crossing control. |
| PDA / Palmtop Systems | Battery-Powered IoT Sensors |
Use Scenario: Main system voltage regulator in compact PDAs with dual-rail requirements (e.g., 1.8V I/O, 1.2V core) and limited PCB real estate. IC Role / Device Role / Timing Role: Compact, high-density power solution delivering 800mA at 1.8V from 3.3V or 3.6V battery input with integrated MOSFETs and no external diode. Use Value: Reduces total BOM count by 3 parts (vs. discrete buck + diode + controller) and cuts solution size by >40%, critical for thin form factors. | Use Scenario: Long-life power management for ultra-low-power sensor nodes powered by coin cells or energy harvesters (2.6–3.6V input range). IC Role / Device Role / Timing Role: Efficient step-down converter supplying 1.0V or 1.2V to microcontroller and analog sensor circuitry with minimal quiescent draw. Use Value: Achieves 140µA quiescent current in PFM mode, enabling multi-year operation on CR2032 cells - validated across -40°C to +85°C industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output, synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz switching frequency, 600mA rated output, 0.6V FB reference, smaller 6-pin WSON package. | Higher frequency enables smaller inductors but lower max current; lacks POK output and forced-PWM pin. | Preferred for space-constrained, lower-current apps where POK and noise control are non-critical. |
| ADP2118ACPZ-R7 | 1.2MHz switching, 800mA output, 0.6V FB, integrated soft-start, but no POK or PWM mode-select pin. | Requires external circuitry for power-good signaling; no user-controllable PFM/PWM transition. | Selected when simplified design and ADI ecosystem compatibility outweigh need for POK and flexible noise control. |
Compared with TPS62231DRVR and ADP2118ACPZ-R7, the MAX1927REUB+T uniquely combines 800mA capability, 0.75V adjustable output, dedicated POK and PWM control pins, and 100% duty-cycle operation - making it optimal for battery-powered RF and processor core applications demanding both efficiency and deterministic noise behavior.
Availability
MAX1927REUB+T is available at Aetrix Electronics and suitable for WCDMA handsets, DSP core power supplies, PDA/palmtop systems, and battery-powered IoT sensors requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX1927REUB+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 industrial, communications, computing, and consumer applications.
The MAX1927REUB+T belongs to Maxim's low-voltage, high-efficiency DC-DC converter product line, designed specifically for powering advanced microprocessors and DSPs in portable, battery-operated equipment where size, efficiency, and noise control are critical.
FAQ
What output voltage range does the MAX1927REUB+T support?
The MAX1927REUB+T supports an adjustable output voltage range from 0.75V to 5V, set via an external resistor divider connected to the FB pin. Its internal feedback reference is precisely trimmed to 0.75V (±1.6% over temperature), enabling accurate regulation for ultra-low-voltage microprocessor cores. This range is confirmed in the Electrical Characteristics table under "FB Voltage Accuracy" for MAX1927R.
Does the MAX1927REUB+T require an external Schottky diode?
No, the MAX1927REUB+T does not require an external Schottky diode. It integrates both a P-channel high-side switch and an N-channel synchronous rectifier, eliminating conduction losses and thermal overhead associated with external diodes. This is explicitly stated in the General Description and Features sections, and confirmed by the "No Schottky Diode Required" feature bullet.
How does the PWM pin on the MAX1927REUB+T affect operation?
The PWM pin on the MAX1927REUB+T selects between two operating modes: driving it to GND enables automatic PFM/PWM mode switching for best light-load efficiency, while driving it to BATT forces continuous 1MHz PWM operation for lowest noise and deterministic frequency - critical in RF-sensitive applications like WCDMA handsets. This functionality is detailed in the Pin Description and Detailed Description sections.
What is the maximum guaranteed output current for the MAX1927REUB+T?
The MAX1927REUB+T guarantees a continuous output current of 800mA across the full operating temperature range (-40°C to +85°C), as specified in the General Description and Ordering Information tables. Peak current capability reaches 1.1A before overcurrent protection activates, per the "P-Channel Current-Limit Threshold" parameter in the Electrical Characteristics.
Is the MAX1927REUB+T compatible with ceramic output capacitors?
Yes, the MAX1927REUB+T is fully compatible with low-ESR ceramic output capacitors. Its control architecture - featuring low AC-loop gain and a high-gain integrator - is specifically designed to stabilize with small-value ceramics (e.g., 10µF X5R), as confirmed in the "Compensation, Stability, and Output Capacitor" section and typical application circuits (Figures 3 and 4).
MAX1927REUB+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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.75V
- Voltage - Output (Max):
- 5.5V
- 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
MAX1927REUB+T FAQ
1.How can I place an order for MAX1927REUB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1927REUB+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 MAX1927REUB+T reliable?
The price and inventory of MAX1927REUB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1927REUB+T is usually 5 days.
3.What payment methods are accepted for MAX1927REUB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1927REUB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1927REUB+T?
MAX1927REUB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1927REUB+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 MAX1927REUB+T?
For technical support, including MAX1927REUB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1927REUB+T requirements.
6.How does Aetrix verify that MAX1927REUB+T is sourced from the original manufacturer or authorized distributors?
All MAX1927REUB+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 MAX1927REUB+T meets industry standards.
7.What is the process for return or replacement of MAX1927REUB+T?
All MAX1927REUB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1927REUB+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 MAX1927REUB+T part is unused and in its original packaging.
Return procedure for MAX1927REUB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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