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STMicroelectronics STOD2540PMR
- Part No.:
- STOD2540PMR
- Manufacturer:
- STMicroelectronics
- Category:
- Display Drivers
- Package:
- 8-VQFN
- Datasheet:
-
STOD2540PMR.pdf
- Description:
- IC DRVR DISPLAY MATRIX 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,918
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Product details
Overview
STOD2540PMR from STMicroelectronics is a dedicated inductor-based boost controller for Passive Matrix OLED (PMOLED) display biasing, delivering up to 25 V at 40 mA output with PFM mode control, integrated load disconnect switch, and adjustable peak current limit (0.1–1.5 A). It operates from 3.0 V to 5.5 V input and supports 1"–1.5" color PMOLED panels in portable handsets.
For engineers reviewing the STOD2540PMR datasheet, STOD2540PMR pinout, STOD2540PMR application, or STOD2540PMR equivalent, key selection criteria include output voltage regulation accuracy (1.24 V ±3% FB reference), OVP threshold (35 V with 2 V hysteresis), shutdown current (3 µA), and QFN8 (3 mm × 3 mm) thermal resistance (52 °C/W).
Technical Context
The STOD2540PMR implements a PFM-controlled boost topology with internal MOSFET switch (RDSON = 0.4 Ω), sensing output voltage via resistive divider feedback (FB pin), and regulating by modulating switching frequency-not duty cycle. Peak inductor current is set externally via RSET (2 kΩ–100 kΩ), enabling precise current limiting across load conditions.
OVP monitors VCAP pin voltage and disables the controller when exceeding 35 V, restarting automatically after voltage drops 2 V below threshold. The high-side Load Disconnect Switch (LDS) isolates VO from the output path during shutdown, eliminating DC leakage paths and reducing standby current to 3 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 5.5 V - supports single-cell Li-ion (3.6 V nominal) and dual-cell alkaline (4.5 V) power sources without external LDO. |
| Regulated Output Voltage | Up to 25 V - sufficient for precharge and column bias of 1.5" color PMOLED displays requiring ≥22 V operation. |
| Max Continuous Output Current | 40 mA at 25 V - enables driving full-color 128×64 pixel PMOLEDs with typical column current demand. |
| Feedback Reference Voltage | 1.24 V ±3% - sets output voltage precision via external resistor divider (e.g., R1 = 180 kΩ, R2 = 10 kΩ → VO ≈ 24 V). |
| Overvoltage Protection Threshold | 35 V with 2 V hysteresis - prevents damage to OLED panel and external components during open-loop failure or feedback disconnection. |
| Shutdown Current | 3 µA at VI = 3.6 V - ensures minimal battery drain in handheld sleep modes where display is inactive but system remains powered. |
| Efficiency Range | 70% at IO = 5–40 mA - maintains high energy conversion across typical PMOLED dynamic load profiles, extending battery life. |
Pinout & Package
STOD2540PMR is housed in a thermally enhanced QFN8 package (3 mm × 3 mm, 0.9 mm height) with exposed thermal pad, rated for 52 °C/W junction-to-ambient thermal resistance. Pin 9 (PGND) and the underside thermal pad must be soldered to PCB ground plane for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VI | Input supply rail | Accepts 3.0–5.5 V DC; connects directly to battery or regulated system rail; bypassed with 4.7 µF ceramic capacitor. |
| 2 RSET | Peak current limit adjust | Resistor-to-ground sets max inductor current (0.1–1.5 A); open or tied to VI defaults to ~1 A. |
| 3 AGND | Analog ground reference | Separate low-noise ground for FB, RSET, and internal references; must be star-connected to PGND near IC. |
| 4 FB | Output voltage feedback | Senses divided VO via R1/R2; internal 1.24 V reference regulates output within ±3% over temperature and line. |
| 5 VO | Regulated output supply | Delivers up to 25 V/40 mA to PMOLED column drivers; requires 4.7 µF low-ESR ceramic output capacitor. |
| 6 VCAP | OVP sense and LDS control | Monitors boosted node for overvoltage; also drives high-side LDS switch to isolate VO during shutdown. |
| 7 ENABLE | Logic-enable input | Active-high (VIH ≥ 1.2 V); no internal pull-up/down; allows system-level on/off control without cutting VI. |
| 8 VSW | Boost switch drain | Connects to inductor and Schottky diode anode; switches at PFM frequency; requires low-inductance layout. |
| 9 PGND | Power ground return | High-current return path for boost switch and LDS; must be low-impedance copper pour tied to thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| PFM boost control | Maintains >65% efficiency down to 1 mA load-critical for ultra-low-power PMOLED standby states. |
| Integrated load disconnect switch (LDS) | Eliminates DC path from VI to VO in shutdown, reducing system standby current by >95% vs discrete solutions. |
| Adjustable peak inductor current limit | Configurable 0.1–1.5 A range via single RSET resistor-enables optimization for inductor saturation and board space. |
| Soft-start with programmable current limit | Prevents inrush into output cap and OLED panel; avoids voltage overshoot during power-up sequencing. |
| OVP with automatic restart | 35 V trip with 2 V hysteresis protects OLED and driver ICs during feedback fault or component drift. |
Applications
| Portable Handset Display Power | Wearable PMOLED Bias Supply |
|---|---|
|
Use Scenario: Powering 1.3" monochrome PMOLED in feature phone with intermittent screen usage and tight battery budget. IC Role / Device Role / Timing Role: Generates stable 18 V column bias and 22 V precharge voltage under dynamic load (1–20 mA), synchronized to display controller frame rate. Use Value: 70% efficiency at 10 mA extends talk-time by 12% versus fixed-frequency boosters; LDS cuts standby drain to <5 µA. |
Use Scenario: Driving 0.96" RGB PMOLED in smartwatch with aggressive sleep/wake cycling and limited PCB area. IC Role / Device Role / Timing Role: Supplies 24 V bias with <1.3% ripple during active frames; enters PFM idle mode between refresh cycles. Use Value: QFN8 (3 mm × 3 mm) footprint fits constrained wearable layouts; 3 µA shutdown current preserves coin-cell runtime over weeks. |
| Medical Diagnostic Display | Industrial HMI Panel |
|
Use Scenario: Backlight-free diagnostic display in portable ultrasound device requiring high contrast and zero EMI coupling to analog front-end. IC Role / Device Role / Timing Role: Provides ripple-free 25 V bias for 128×64 PMOLED; PFM operation avoids fixed switching noise near sensitive ADC clock domains. Use Value: 1.3% output ripple at 30 mA eliminates visible flicker; thermal pad design sustains 85°C ambient without derating. |
Use Scenario: Operator interface on factory floor panel with wide temperature range (-40°C to +85°C) and infrequent display updates. IC Role / Device Role / Timing Role: Delivers 20 V bias with guaranteed start-up at -40°C; FB reference stability ensures consistent brightness across temperature. Use Value: FB voltage drift <±35 mV over full temp range maintains luminance uniformity; OVP prevents field failures due to feedback trace corrosion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PMOLED display power supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1711EUT+T | Fixed 1.25 V FB reference; no integrated LDS; requires external high-side switch for load isolation. | Lacks built-in load disconnect-adds BOM cost and PCB area; less suitable for ultra-low-standby systems. | Choose if existing design uses MAXIM ecosystem and can accommodate external switch + gate driver. |
| TPS61042DRVR | Higher max output (28 V); 2.5 MHz fixed-frequency PWM; no OVP hysteresis; 1.23 V FB reference. | Better suited for higher-voltage OLEDs but less efficient below 5 mA; no automatic OVP recovery. | Prefer for designs needing >25 V or tighter EMI control via fixed frequency, accepting lower light-load efficiency. |
Compared with MAX1711EUT+T and TPS61042DRVR, STOD2540PMR uniquely integrates load disconnect, OVP with hysteresis, and PFM efficiency down to 1 mA-making it optimal for battery-constrained portable PMOLEDs where standby current and fault resilience are critical.
Availability
STOD2540PMR is available at Aetrix Electronics and suitable for portable handset displays, wearable electronics, medical diagnostic interfaces, and industrial HMIs requiring stable component supply, long-lifecycle support, and guaranteed QFN8 sourcing.
Supply support for STOD2540PMR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.
STOD2540PMR belongs to ST's display power management product line, engineered specifically for passive-matrix OLED biasing in space- and power-constrained portable devices-emphasizing low quiescent current, integrated protection, and compact packaging.
FAQ
What is the minimum input voltage required for STOD2540PMR to regulate 24 V output?
The STOD2540PMR requires ≥3.0 V input to initiate switching and sustain regulation at 24 V output. At VI = 3.0 V, the device delivers full 40 mA with typical efficiency of 65%, verified per Table 4 test conditions (VI = 3.6 V, VO = 24 V, IO = 5–40 mA). Below 3.0 V, startup fails and regulation is not guaranteed.
Can STOD2540PMR drive a 2.0" PMOLED panel?
No-STOD2540PMR is rated for 1", 1.3", and 1.5" color PMOLEDs per its datasheet description and 40 mA maximum output capability. A 2.0" panel typically demands >50 mA at 25 V, exceeding the IC's continuous current rating and thermal limits in QFN8 package; derating or parallel solutions would be required.
How is the load disconnect switch controlled, and does it require external circuitry?
The load disconnect switch (LDS) is fully integrated and automatically activated when ENABLE is pulled low. No external FET, driver, or control logic is needed-the LDS connects VO to VCAP internally and blocks current flow during shutdown, reducing system standby current to 3 µA without added components.
What is the recommended inductor value and saturation current for STOD2540PMR at 24 V/30 mA output?
Per ST's typical application (Figure 3 and Table 5), a 4.7 µH shielded inductor with ISAT ≥ 1 A is recommended. This value balances PFM frequency stability, size, and efficiency; using <3.3 µH risks excessive peak current and reduced efficiency, while >6.8 µH increases response time and may compromise transient performance at 30 mA load steps.
STOD2540PMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Display Type:
- PMOLED
- Configuration:
- Display Matrix
- Interface:
- -
- Digits or Characters:
- -
- Current - Supply:
- 400 µA
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (3x3)
STOD2540PMR FAQ
1.How can I place an order for STOD2540PMR through Aetrix?
Please submit a Request for Quotation (RFQ) for STOD2540PMR 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 STOD2540PMR reliable?
The price and inventory of STOD2540PMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STOD2540PMR is usually 5 days.
3.What payment methods are accepted for STOD2540PMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STOD2540PMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STOD2540PMR?
STOD2540PMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STOD2540PMR 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 STOD2540PMR?
For technical support, including STOD2540PMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STOD2540PMR requirements.
6.How does Aetrix verify that STOD2540PMR is sourced from the original manufacturer or authorized distributors?
All STOD2540PMR 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 STOD2540PMR meets industry standards.
7.What is the process for return or replacement of STOD2540PMR?
All STOD2540PMR units undergo pre-shipment inspection (PSI). If there is an issue with STOD2540PMR, 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 STOD2540PMR part is unused and in its original packaging.
Return procedure for STOD2540PMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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