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Diodes Incorporated AP3031KTR-G1
- Part No.:
- AP3031KTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AP3031KTR-G1.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:8,148
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Product details
Overview
AP3031KTR-G1 from BCD Semiconductor Manufacturing Limited is a constant-frequency, current-mode DC/DC boost converter IC designed to drive white LED arrays in LCD backlight systems. It delivers up to 1.4A switch current, operates at 1MHz switching frequency, features 200mV feedback reference voltage and integrated over-voltage protection (OVP), and is optimized for 7″–10″ LCD panel backlights using 3×13 LED configurations.
For engineers reviewing the AP3031KTR-G1 datasheet, AP3031KTR-G1 pinout, AP3031KTR-G1 application, or AP3031KTR-G1 equivalent, key selection criteria include its 2.7–16V input range, standby-mode PWM dimming support up to 25kHz, cycle-by-cycle current limiting, soft-start functionality, and SOT-23-6 package compatibility with space-constrained portable displays.
Technical Context
The AP3031 employs a fixed-frequency (1MHz) current-mode PWM control architecture with internal ramp compensation and an error amplifier comparing FB voltage against a precise 200mV reference. Its peak-current sensing enables tight line/load regulation and stable operation across wide input (2.7–16V) and temperature (−40°C to +85°C) ranges.
Functional blocks include a 1.4A N-channel MOSFET switch, integrated soft-start timer (250μs), thermal shutdown (155°C), UVLO (2.7V), and dedicated CTRL pin supporting both enable/disable control and high-frequency PWM dimming via logic pulse width discrimination (0.7ms threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1 MHz - Enables use of ultra-small 4.7μH inductors and 0.47μF output capacitors, reducing board area by >40% vs. 500kHz converters. |
| Feedback Reference Voltage | 200 mV ±12 mV - Sets LED current accuracy via external RISET resistor; supports <±3% ILED tolerance with 1% RISET. |
| Max Switch Current Limit | 1.4 A - Supports driving 39 LEDs (3×13) at 260mA total with margin; cycle-by-cycle limiting prevents inductor saturation. |
| Input Voltage Range | 2.7 V to 16 V - Covers single-cell Li-ion (3.0–4.2V), dual-cell NiMH (2.4–3.0V), and 5V/12V system rails without external regulators. |
| OVP Threshold | 17.5 V ±2 V - Clamps output during open-circuit LED failure, preventing damage to downstream components and enabling safe hot-plug detection. |
| CTRL Pin Logic Threshold | High: ≥1.8 V, Low: ≤0.5 V - Enables direct interface with 1.8V/3.3V/5V GPIOs; 0.7ms low-pulse discrimination enables seamless transition between soft-start and standby dimming modes. |
| Thermal Shutdown | 155 °C - Protects die under sustained overload or poor PCB thermal design; auto-recovery after junction cooldown. |
Pinout & Package
SOT-23-6 package (3.02 × 2.82 × 1.45 mm), RoHS-compliant, green (G1 suffix), rated for −40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Node | Connects to inductor and Schottky diode anode; carries high di/dt switching current; requires tight layout and ground plane clearance. |
| 2 (GND) | Power Ground | Main return path for switch current and IC bias; must be low-impedance connection to minimize noise coupling into FB/CTRL pins. |
| 3 (FB) | Feedback Input | Senses output current via RISET resistor; 200mV reference enables accurate current regulation independent of LED VF drift. |
| 4 (VIN) | Input Supply | Accepts 2.7–16V; requires local 10μF ceramic bypass capacitor placed within 2mm of pin to suppress high-frequency ripple. |
| 5 (OV) | OVP Sense | Directly connected to output node; triggers clamping when voltage exceeds ~17.5V; no external divider needed. |
| 6 (CTRL) | Enable/Dimming Control | Active-high enable; logic-low pulses <0.7ms enter standby mode for flicker-free 25kHz+ PWM dimming; >0.7ms triggers soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Standby-mode PWM dimming | Enables 25kHz+ dimming without audio noise by holding converter in ready state-no inrush current or output droop during duty-cycle transitions. |
| Integrated OVP with output clamping | Prevents catastrophic overvoltage during LED string open-circuit failure; eliminates need for external Zener or TVS on output rail. |
| 200mV precision feedback reference | Reduces RISET power dissipation by 5× vs. 1.25V references; improves thermal stability and allows smaller, lower-cost resistors. |
| 1MHz fixed-frequency operation | Permits use of miniature 1mm-height inductors and low-ESR ceramic capacitors-critical for ultra-thin LCD modules and portable photo frames. |
| Thermal shutdown + UVLO + soft-start | Ensures robust startup under cold battery conditions, protects against PCB overheating, and prevents inrush current damage to input capacitors and LEDs. |
Applications
| 7″–10″ LCD Panel Backlight | Digital Photo Frame |
|---|---|
|
Use Scenario: Driving 39-white-LED array (3×13) in compact LCD display requiring uniform brightness and minimal EMI. IC Role / Device Role / Timing Role: Primary LED current regulator and voltage booster; provides constant-current source synchronized to 1MHz internal clock. Use Value: Achieves >90% efficiency at 5V input/10V output, reduces thermal load on display PCB, and enables thin bezel designs via small passive component footprint. |
Use Scenario: Powering multi-color LED backlight in battery-powered digital photo frame with adjustable brightness. IC Role / Device Role / Timing Role: High-efficiency boost controller with PWM-dimming interface; manages LED current while maintaining stable VOUT under varying battery voltage (3.0–4.2V). Use Value: Extends battery life by >25% vs. linear regulators; 25kHz standby dimming eliminates audible coil whine during image transitions. |
| GPS Receiver Display | Portable DVD Player (PDVD) |
|
Use Scenario: Illuminating small monochrome or color LCD in automotive-grade GPS unit exposed to wide temperature swings. IC Role / Device Role / Timing Role: Robust LED driver with −40°C to +85°C operation, UVLO, and thermal shutdown; regulates current despite 12V vehicle supply transients. Use Value: Ensures consistent backlight luminance across operating temperature range; OVP protects display electronics during load dump events. |
Use Scenario: Backlighting 7″ widescreen LCD in portable DVD player powered by 2-cell Li-ion pack. IC Role / Device Role / Timing Role: High-current boost converter supporting dynamic dimming during video playback; handles input voltage sag during motor start-up. Use Value: Maintains full brightness at end-of-charge (3.2V input); soft-start prevents brown-out of MCU during power-on sequencing. |
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 |
|---|---|---|---|
| RT9293BGJ6 | Fixed 1.2MHz frequency; 1.3A switch limit; 0.6V FB reference; no integrated OVP | Requires external OVP circuit; higher FB voltage increases RISET power loss and thermal sensitivity | Choose if board space permits external protection and higher quiescent current (500μA) is acceptable. |
| MT9700-12 | Adjustable 500kHz–2MHz frequency; 1.5A switch limit; 200mV FB; includes I²C dimming interface | Supports digital brightness control but adds firmware overhead and I²C routing complexity | Choose only if system already uses I²C bus and requires programmable dimming curves beyond PWM. |
Compared with RT9293BGJ6 and MT9700-12, AP3031KTR-G1 offers integrated OVP and optimal 1MHz operation for minimal passive size-making it superior for cost-sensitive, space-constrained LCD backlight designs where analog PWM dimming suffices.
Availability
AP3031KTR-G1 is available at Aetrix Electronics and suitable for 7″–10″ LCD panel backlighting, digital photo frames, GPS receiver displays, and portable DVD players requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for AP3031KTR-G1 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 design and wafer fabrication company specializing in high-efficiency power management solutions for consumer and industrial applications.
The AP3031 belongs to BCD's white LED backlight driver product line, engineered specifically for compact, high-brightness LCD displays requiring low-noise, thermally robust, and cost-optimized boost conversion.
FAQ
What is the minimum input voltage required for AP3031KTR-G1 to start switching?
The AP3031KTR-G1 incorporates under-voltage lockout (UVLO) with a turn-on threshold of 2.7V. Below this voltage, the IC remains disabled and draws only 20–80μA shutdown current. Stable switching begins once VIN rises above 2.7V and the internal soft-start circuit completes its 250μs ramp-up sequence.
How does the CTRL pin distinguish between soft-start and standby mode?
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 shorter, it enters standby mode-keeping internal circuits active and enabling immediate, flicker-free PWM dimming at frequencies up to 25kHz without output voltage droop.
Can AP3031KTR-G1 drive more than 39 LEDs in series?
No-the AP3031KTR-G1's 17.5V OVP threshold and 1.4A switch limit constrain practical operation to ≤39 LEDs (3×13 at ~3.2V VF each, totaling ~10.5V). Driving longer strings would exceed OVP clamp voltage or cause thermal overload due to increased power dissipation in the internal switch.
Is an external Schottky diode mandatory for AP3031KTR-G1 operation?
Yes-an external Schottky diode is required in the boost topology to provide the freewheeling path during switch off-time. The datasheet specifies use of a low-VF, fast-recovery Schottky (e.g., SS34) connected between SW and output; omitting it causes catastrophic failure due to unclamped inductive kickback.
AP3031KTR-G1 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):
- 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-G1 FAQ
1.How can I place an order for AP3031KTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3031KTR-G1 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-G1 reliable?
The price and inventory of AP3031KTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3031KTR-G1 is usually 5 days.
3.What payment methods are accepted for AP3031KTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3031KTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3031KTR-G1?
AP3031KTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3031KTR-G1 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-G1?
For technical support, including AP3031KTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3031KTR-G1 requirements.
6.How does Aetrix verify that AP3031KTR-G1 is sourced from the original manufacturer or authorized distributors?
All AP3031KTR-G1 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-G1 meets industry standards.
7.What is the process for return or replacement of AP3031KTR-G1?
All AP3031KTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3031KTR-G1, 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-G1 part is unused and in its original packaging.
Return procedure for AP3031KTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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