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Diodes Incorporated AP3031KTR-AG1
- Part No.:
- AP3031KTR-AG1
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AP3031KTR-AG1.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,341
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Product details
Overview
AP3031KTR-AG1 from BCD Semiconductor Manufacturing Limited is a constant-frequency 1MHz current-mode DC/DC boost converter optimized for driving white LED arrays in compact LCD backlight systems. It delivers up to 1.4A switch current, supports 2.7V–16V input, features 200mV feedback reference, and integrates overvoltage protection (17.5V clamping), soft-start, and standby-mode PWM dimming - enabling reliable 3×13 LED operation in 7″–10″ panels.
For engineers reviewing the AP3031KTR-AG1 datasheet, AP3031KTR-AG1 pinout, AP3031KTR-AG1 application, or AP3031KTR-AG1 equivalent, key selection criteria include its 1MHz switching frequency for small external components (4.7μH inductor, 0.47μF capacitor), cycle-by-cycle current limit, thermal shutdown at 155°C, and dual-dimming capability via CTRL pin timing control.
Technical Context
The AP3031KTR-AG1 employs fixed-frequency current-mode PWM control with internal ramp compensation, where peak switch current is regulated by the error amplifier output against a stabilized ramp signal. Its feedback loop uses a precise 200mV reference to set LED current via an external RISET resistor, ensuring stable constant-current output across temperature.
It implements two distinct CTRL pin response modes: logic-low pulses >0.7ms trigger soft-start for inrush limiting, while pulses <0.7ms activate standby mode for high-frequency (≥25kHz) PWM dimming without audible noise. Overvoltage protection monitors output directly via the OV pin and clamps voltage at 17.5V during open-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1 MHz - enables use of ultra-small 4.7μH inductors and 0.47μF ceramic capacitors, reducing board area and EMI filter complexity. |
| Feedback Voltage | 200 mV - sets LED current accuracy via external RISET resistor; tolerance ±6 mV over –40°C to +85°C ensures tight current regulation. |
| Switch Current Limit | 1.4 A - supports driving up to 39 LEDs (3×13 array) at 260mA total output under typical 5V–9V input conditions. |
| Input Voltage Range | 2.7 V to 16 V - accommodates single-cell Li-ion (3.0–4.2V), dual-cell NiMH (2.4–2.8V), and 12V supply rails without external regulators. |
| OVP Threshold | 17.5 V - clamps output during LED string open-circuit failure, preventing damage to downstream components and maintaining system safety. |
| CTRL Pin Response Time | 0.7 ms - defines boundary between soft-start activation (>0.7ms low) and standby-mode dimming (<0.7ms low), enabling deterministic dimming architecture. |
| Thermal Shutdown | 155 °C - protects die integrity during sustained overload or poor PCB thermal design; recovery occurs after junction cools below hysteresis threshold. |
Pinout & Package
AP3031KTR-AG1 is packaged in SOT-23-6 (lead-free, RoHS-compliant "G1" suffix), with 1.0mm max height and standard JEDEC footprint. Pin 1 marked with dot; pinout matches K/KT package designation per datasheet Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Power Switch Node | Connects to inductor and Schottky diode anode; carries high dI/dt switching current - requires short, low-inductance PCB trace. |
| 2 (GND) | Power Ground | Main return path for switch current and IC bias; must be tied to low-impedance ground plane adjacent to SW and VIN pins. |
| 3 (FB) | Voltage Feedback Input | Senses output current via RISET resistor; 200mV reference sets ILED = 200mV / RISET; high-impedance node sensitive to noise. |
| 4 (VIN) | Input Supply | 2.7–16V DC input; requires local 10μF ceramic bypass capacitor placed within 2mm of pin to suppress switching transients. |
| 5 (OV) | Overvoltage Sense | Direct connection to output rail; triggers internal clamp when voltage exceeds 17.5V - no external divider needed. |
| 6 (CTRL) | Enable & Dimming Control | Active-high enable (≥1.8V); logic-low duration determines mode: >0.7ms → soft-start, <0.7ms → standby dimming. |
Key Features
| Feature | Design Value |
|---|---|
| Standby-mode PWM dimming | Enables ≥25kHz dimming without audio noise by bypassing soft-start and entering immediate switching upon CTRL re-enable. |
| Integrated OVP with direct OV pin | Eliminates need for external voltage divider or comparator; clamps output at 17.5V during open-LED fault, preserving system reliability. |
| Cycle-by-cycle current limit | 1.4A hard limit prevents inductor saturation and MOSFET overstress during transient load or short-circuit events. |
| Low 200mV feedback reference | Reduces power loss in current-sense resistor and improves efficiency at low LED currents (e.g., 20–260mA range). |
| Thermal shutdown with hysteresis | Shuts down at 155°C junction temperature and resumes only after cooling to ~140°C, preventing thermal runaway in confined enclosures. |
Applications
| 7″–10″ LCD Panel Backlight | Digital Photo Frame |
|---|---|
|
Use Scenario: Driving 3×13 white LED strings in space-constrained portable displays powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED brightness via FB pin and dimming via CTRL pin pulse width. Use Value: Delivers 92% efficiency at 9V input/260mA output, enabling >5-hour runtime while maintaining uniform luminance across full temperature range (–40°C to +85°C). |
Use Scenario: Powering multi-color WLED backlight in battery-operated photo frames with adjustable brightness and silent dimming. IC Role / Device Role / Timing Role: High-frequency dimming controller using CTRL pin's sub-0.7ms pulse detection to avoid audible coil whine. Use Value: Supports flicker-free 25kHz PWM dimming without external circuitry, eliminating mechanical buzzing in consumer-facing devices. |
| GPS Receiver Display | Portable DVD Player (PDVD) |
|
Use Scenario: Illuminating small-form-factor GPS unit display under variable ambient light and wide input voltage (e.g., automotive 9–16V). IC Role / Device Role / Timing Role: Input-voltage-robust LED driver with UVLO (2.7V) and OVP (17.5V) for safe operation across vehicle battery fluctuations. Use Value: Maintains consistent backlight intensity despite cold cranking dips or alternator surges, improving readability in automotive environments. |
Use Scenario: Powering dual-zone LED backlights in portable DVD players with independent brightness control per zone. IC Role / Device Role / Timing Role: Dual-mode controller supporting both analog dimming (via FB voltage modulation) and digital PWM dimming (via CTRL pin). Use Value: Enables hybrid dimming schemes - e.g., coarse adjustment via DC offset on FB and fine-tuning via 25kHz CTRL PWM - for optimal contrast and power savings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT9397BZSP | Fixed 1.2MHz frequency; 1.3A switch limit; no integrated OVP - requires external OV sensing circuit. | Lacks direct OV pin and standby-mode dimming; dimming relies solely on EN pin toggling with external RC timing. | Choose when board space allows external OVP components and dimming frequency <1kHz is acceptable. |
| MT9700EN | 1.3MHz switching; 1.5A current limit; 190mV feedback reference; includes soft-start but no standby dimming mode. | Supports higher current but lacks sub-millisecond CTRL timing discrimination - cannot achieve true 25kHz flicker-free dimming. | Prefer for higher-output-current designs where dimming noise is mitigated by mechanical shielding rather than frequency shift. |
Compared with RT9397BZSP and MT9700EN, AP3031KTR-AG1 uniquely combines integrated OVP clamping, 0.7ms CTRL timing threshold for standby dimming, and 200mV precision reference - making it optimal for compact, noise-sensitive, and fault-tolerant LED backlight systems.
Availability
AP3031KTR-AG1 is available at Aetrix Electronics and suitable for 7″–10″ LCD panel backlighting, portable DVD player illumination, GPS receiver displays, and digital photo frame lighting requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for AP3031KTR-AG1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog IC designer specializing in power management, LED drivers, and mixed-signal solutions for consumer, industrial, and automotive markets.
The AP3031 belongs to BCD's white LED boost converter product line, engineered specifically for high-efficiency, low-noise, and fault-resilient backlighting in portable displays with stringent size and thermal constraints.
FAQ
What is the maximum LED string voltage supported by AP3031KTR-AG1?
The AP3031KTR-AG1 includes overvoltage protection that clamps output at 17.5V (typical), allowing safe operation with LED strings up to ~15V forward voltage. With 16V absolute max input and 38V SW pin rating, it supports configurations like 5×3.2V LEDs (16V total) plus headroom for current-sense and diode drops.
How does the CTRL pin distinguish between soft-start and standby modes?
The CTRL pin detects logic-low pulse width: if low time exceeds 0.7ms before re-enabling, the IC initiates soft-start to limit inrush current; if low time is less than 0.7ms, it enters standby mode and resumes switching immediately - enabling high-frequency PWM dimming without startup delay or audible noise.
Can AP3031KTR-AG1 drive more than 39 LEDs?
No - the 1.4A switch current limit and thermal design (θJA = 265°C/W in SOT-23-6) constrain practical operation to ≤39 LEDs (e.g., 3×13 at 260mA). Driving more LEDs increases output voltage and duty cycle, raising power dissipation beyond safe junction limits without enhanced heatsinking or package change.
Is an external Schottky diode required, and what specifications are recommended?
Yes - an external Schottky diode is mandatory between SW and output. Recommended specs: 30V+ PIV, ≤0.4V forward drop at 300mA, low reverse recovery (e.g., SS34 or MBR0530). Placement must minimize loop area with SW, COUT+, and GND to reduce EMI and voltage spikes.
AP3031KTR-AG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.4A (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
AP3031KTR-AG1 FAQ
1.How can I place an order for AP3031KTR-AG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3031KTR-AG1 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 AP3031KTR-AG1 reliable?
The price and inventory of AP3031KTR-AG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3031KTR-AG1 is usually 5 days.
3.What payment methods are accepted for AP3031KTR-AG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3031KTR-AG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3031KTR-AG1?
AP3031KTR-AG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3031KTR-AG1 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 AP3031KTR-AG1?
For technical support, including AP3031KTR-AG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3031KTR-AG1 requirements.
6.How does Aetrix verify that AP3031KTR-AG1 is sourced from the original manufacturer or authorized distributors?
All AP3031KTR-AG1 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 AP3031KTR-AG1 meets industry standards.
7.What is the process for return or replacement of AP3031KTR-AG1?
All AP3031KTR-AG1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3031KTR-AG1, 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 AP3031KTR-AG1 part is unused and in its original packaging.
Return procedure for AP3031KTR-AG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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