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Diodes Incorporated AP5725WUG-7
- Part No.:
- AP5725WUG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AP5725WUG-7.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,261
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Product details
Overview
AP5725WUG-7 from Diodes Incorporated is a white LED step-up DC/DC converter IC with integrated 0.95Ω MOSFET, 1.2MHz fixed-frequency switching, 0.25V feedback reference, over-voltage protection (OVP threshold = 30V), and 2–6-series LED driving capability from 2.7–5.5V input - used in backlighting for handheld displays.
For engineers reviewing the AP5725WUG-7 datasheet, AP5725WUG-7 pinout, AP5725WUG-7 application, or AP5725WUG-7 equivalent, key selection criteria include constant-current accuracy (±10% over temp), thermal shutdown behavior, OVP response time, and compatibility with 1.2MHz ceramic-output-filter designs in space-constrained portable devices.
Technical Context
The AP5725WUG-7 implements a current-mode boost controller with internal 1.2MHz oscillator, ramp generator, and comparator-based PWM logic. It regulates LED current via feedback of a 0.25V reference across an external RSET resistor, enabling precise ILED = 0.25V/RSET control.
Its functional block includes integrated soft-start, UVLO (2.2V turn-on, 85mV hysteresis), over-temperature protection (TJ = 150°C), and OVP monitoring at the dedicated OVP pin - triggering immediate SW shutdown when output exceeds 30V (typical) to protect external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2 MHz - enables use of compact 22μH inductors and 1μF ceramic capacitors without audible noise. |
| Feedback Reference Voltage | 0.25 V ±10% - minimizes power loss in RSET and supports high-efficiency current setting (e.g., 25mA → RSET = 10Ω). |
| Input Voltage Range | 2.7 V to 5.5 V - matches single-cell Li-ion (3.0–4.2V) and dual-cell alkaline/NiMH operation. |
| MOSFET RDS(on) | 0.95 Ω (typ.) - limits conduction loss during high-duty-cycle operation with 6-series LEDs (~18V output). |
| OVP Threshold | 30 V (typ.) - protects SW and OVP pins during open-circuit LED failure or cold-junction disconnect. |
| Quiescent Current | 500 μA (typ.) - ensures low standby power in always-on display subsystems. |
| Thermal Shutdown | 150 °C junction temperature - prevents permanent damage during sustained high-power operation in sealed enclosures. |
Pinout & Package
AP5725WUG-7 uses the TSOT23-6 package (1.6mm × 2.9mm × 0.9mm, 0.65mm pitch), optimized for high-density portable PCB layouts. Pin 1 (SW) carries high di/dt switching current; Pin 2 (VIN) requires local 1μF ceramic bypassing; Pin 3 (OVP) must be routed with minimal trace capacitance for fast overvoltage detection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Power switch node | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimized loop area to reduce EMI. |
| VIN | Input supply | Accepts 2.7–5.5V; must be decoupled with ≥1μF X5R/X7R ceramic capacitor placed <2mm from pin. |
| OVP | Over-voltage sense input | Monitors output via resistive divider; triggers shutdown if voltage exceeds 30V (typ.) to prevent SW overstress. |
| GND | Power ground | Common return for VIN, FB, EN, and OVP; must connect to solid ground plane under IC body for thermal and noise control. |
| FB | Current-sense feedback | References 0.25V; connects to cathode of lowest LED + RSET; bias current ≤100nA enables precision current setting. |
| EN | Enable control | Active-high logic input (1.5V min high); tied to VIN for automatic startup; must not float. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated soft-start | Prevents inrush current and output overshoot during startup by gradually increasing duty cycle over ~1ms. |
| Internal thermal shutdown | Halts switching at 150°C junction temperature and resumes only after cooldown to ~135°C, preventing latch-up. |
| 0.25V feedback reference | Reduces RSET power dissipation by >60% vs. 1.25V references, enabling tighter current tolerance with 1% resistors. |
| 1.2MHz fixed-frequency operation | Enables full LED current regulation using 22μH inductors <4mm² footprint and avoids AM-band interference. |
| Dual protection architecture | Combines OVP (pin-triggered) and UVLO (2.2V turn-on) to ensure safe operation across battery discharge and fault conditions. |
Applications
| Cellular Phone Backlight | Digital Camera LCD Backlight |
|---|---|
|
Use Scenario: Driving 4–6 white LEDs in series for main display backlight in GSM/UMTS smartphones with Li-ion battery input. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current at 20–25mA with PWM dimming via EN pin. Use Value: Delivers >84% efficiency at 3.6V input/15V output, minimizing heat generation in thermally constrained front bezel assemblies. |
Use Scenario: Powering high-brightness WLED array behind 2.5"–3.5" TFT-LCD viewfinder and rear screen in compact digital cameras. IC Role / Device Role / Timing Role: Step-up converter with OVP-enabled open-circuit protection during lens retraction or display sleep mode. Use Value: Maintains uniform brightness across all LEDs without ballast resistors, reducing BOM count and PCB area by 30% vs. linear solutions. |
| GPS Receiver Display | MP3 Player OLED Interface |
|
Use Scenario: Supplying regulated current to 2–4-series WLEDs in automotive-grade GPS navigation units operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Temperature-stable LED driver with ±10% ILED variation over -40°C to +125°C junction range. Use Value: Ensures consistent display luminance despite battery voltage sag (2.7V min) and wide thermal cycling, meeting automotive display specs. |
Use Scenario: Driving small-form-factor OLED or WLED indicators and status displays in battery-powered MP3 players with 3.7V Li-Po input. IC Role / Device Role / Timing Role: Low-quiescent-current (500μA) boost IC supporting DC dimming via external voltage divider on FB pin. Use Value: Extends playback time by >12% vs. competing drivers due to reduced no-load consumption and high light-output-per-watt efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3606WU-7 | Higher 1.5MHz switching frequency; lower 0.2V feedback reference; no OVP pin - relies on internal clamp. | Lacks dedicated OVP monitoring; less robust against open-circuit LED failure in high-reliability displays. | Preferred where board space is tighter and OVP redundancy is not required; requires revised RSET calculation. |
| LM3407MMX/NOPB | Adjustable 0.5–2.5MHz frequency; external MOSFET; higher 1.235V reference; no integrated thermal shutdown. | Requires external FET, gate driver, and thermal sensor; better for >100mA strings but increases component count. | Chosen when driving >6 LEDs or needing programmable frequency; adds design complexity but improves scalability. |
Compared with AP3606WU-7 and LM3407MMX/NOPB, AP5725WUG-7 offers the best balance of integration (MOSFET + OVP + thermal shutdown), fixed 1.2MHz stability, and ultra-low RSET loss - making it optimal for cost-sensitive, space-limited 2–6 LED portable displays.
Availability
AP5725WUG-7 is available at Aetrix Electronics and suitable for cellular phone backlighting, digital camera LCD modules, GPS receiver displays, and MP3 player OLED interfaces requiring stable component supply across production lifecycles.
Supply support for AP5725WUG-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP5725 belongs to Diodes' LED lighting driver product line, engineered specifically for high-efficiency, low-noise, single-cell portable display backlighting with minimal external components.
FAQ
What is the maximum number of white LEDs the AP5725WUG-7 can drive in series?
The AP5725WUG-7 is rated to drive 2 to 6 white LEDs in series from a 2.7–5.5V input. With typical forward voltage of 3.0–3.4V per LED, this supports output voltages up to ~20.4V. Its 30V OVP threshold and 34V SW absolute max rating provide margin for transient spikes during startup or load steps.
Can the AP5725WUG-7 support parallel LED strings?
Yes - the AP5725WUG-7 supports single-feedback operation across multiple parallel LED strings, provided each string contains an identical number of series-connected LEDs. This maintains current matching without individual ballast resistors, though total output current must remain within the 750mA switch current limit.
How does the OVP function respond during an open-circuit LED condition?
During open-circuit LED failure, FB voltage drops to 0V, causing the controller to increase duty cycle until output rises. When the divided output voltage at the OVP pin reaches 30V (typ.), the internal comparator triggers immediate SW shutdown - holding the output at a safe clamped level and preventing SW or OVP pin overvoltage stress.
What is the recommended inductor value and key selection criteria?
A 22μH shielded power inductor with ≥0.5A saturation current is recommended (e.g., Wurth 744031220). Critical criteria include low DCR (<200mΩ), core material stable at 1.2MHz (e.g., ferrite), and self-resonant frequency >10MHz to avoid Q degradation. Inductor size must fit TSOT23-6 layout constraints with minimal SW-node loop area.
AP5725WUG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 26V
- Current - Output / Channel:
- 750mA (Switch)
- Frequency:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
AP5725WUG-7 FAQ
1.How can I place an order for AP5725WUG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP5725WUG-7 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 AP5725WUG-7 reliable?
The price and inventory of AP5725WUG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP5725WUG-7 is usually 5 days.
3.What payment methods are accepted for AP5725WUG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP5725WUG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP5725WUG-7?
AP5725WUG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP5725WUG-7 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 AP5725WUG-7?
For technical support, including AP5725WUG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP5725WUG-7 requirements.
6.How does Aetrix verify that AP5725WUG-7 is sourced from the original manufacturer or authorized distributors?
All AP5725WUG-7 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 AP5725WUG-7 meets industry standards.
7.What is the process for return or replacement of AP5725WUG-7?
All AP5725WUG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP5725WUG-7, 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 AP5725WUG-7 part is unused and in its original packaging.
Return procedure for AP5725WUG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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