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Diodes Incorporated AP3605FNTR-E1
- Part No.:
- AP3605FNTR-E1
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
AP3605FNTR-E1.pdf
- Description:
- IC LED DRVR RGLTR PWM 20MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,206
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Product details
Overview
AP3605FNTR-E1 from BCD Semiconductor is a 4-channel charge pump LED driver with integrated current sources, designed for white LED backlighting in portable displays. It delivers up to 20mA per channel (80mA total), supports 2.7–5.5V input, operates at 1MHz switching frequency, and enables PWM dimming up to 50kHz - ideal for Li-ion–powered mobile phone and PDA backlight systems.
For engineers reviewing the AP3605FNTR-E1 datasheet, AP3605FNTR-E1 pinout, AP3605FNTR-E1 application, or AP3605FNTR-E1 equivalent, key selection criteria include regulated ±3% current matching across channels, ISET-resistor programmability, EN-pin PWM brightness control, and QFN-3×3-16 thermal performance under -40°C to +85°C operation.
Technical Context
The AP3605 employs a 1.5× fractional charge pump architecture preceded by an internal LDO to stabilize the pump input at ~5V, minimizing output ripple and enabling efficient step-up operation from low-input batteries. Its four matched current sources are driven by a shared reference voltage (1.23V typ.) mirrored via precision current ratios (K = 100–140).
Control logic integrates soft-start (400μs), thermal shutdown (160°C with 20°C hysteresis), standby mode (2ms EN low threshold), and dual dimming support: analog via ISET bias and digital via EN-pin PWM (1–50kHz). All outputs share common VOUT1/VOUT2 nodes requiring PCB-level connection per datasheet layout guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current per Channel | 20mA max - sets white LED brightness with ±3% matching between any two channels for uniform backlight luminance. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion battery discharge profile without external regulation. |
| Switching Frequency | 1MHz (typ.) - allows use of two 1μF ceramic flying capacitors, reducing board area vs. lower-frequency charge pumps. |
| PWM Dimming Support | Up to 50kHz - avoids audible noise and enables high-resolution brightness control in display subsystems. |
| Current Set Reference | 1.23V (typ.) at ISET pin - defines LED current via external resistor (RISET = 1.8kΩ → 20mA), enabling precise factory calibration. |
| Thermal Protection | OTSD at 160°C with 20°C hysteresis - prevents latch-up during sustained high-current or high-ambient operation. |
| Shutdown Current | <1μA - achieved by pulling EN low, critical for battery runtime extension in standby modes. |
Pinout & Package
The AP3605FNTR-E1 is housed in a thermally enhanced QFN-3×3-16 package with exposed pad connected to AGND, supporting ≤60°C/W junction-to-ambient thermal resistance. Pin 1 marking aligns with top-view orientation shown in Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1–D4 (Pins 1,14–16) | Current Source Output | Drive LED anodes individually; each delivers regulated current up to 20mA with ±3% matching. |
| VIN1/VIN2 (Pins 5,13) | Supply Input | Must be shorted on PCB; accepts 2.7–5.5V input and powers internal LDO/charge pump stages. |
| VOUT1/VOUT2 (Pins 2,8) | Charge Pump Output | Must be shorted on PCB; supplies boosted voltage to all four current sources, typically ~5V in 1.5× mode. |
| ISET (Pin 11) | Current Reference Input | Connects to GND via resistor (e.g., 1.8kΩ) to set 20mA per channel; 1.23V reference ensures stable current programming. |
| EN (Pin 12) | Enable / PWM Control | Logic-high enables operation; PWM signal applied here achieves linear brightness dimming with built-in 2ms standby timing. |
| PGND (Pin 3) & AGND (Pin 10) | Ground Returns | PGND handles power return; AGND serves analog reference; both and exposed pad must connect to same ground plane. |
| C1±/C2± (Pins 4,6,7,9) | Flying Capacitor Terminals | Two independent 1μF ceramic caps required; placement proximity to pins minimizes ESR-induced losses and ripple. |
Key Features
| Feature | Design Value |
|---|---|
| ±3% LED current matching | Ensures consistent brightness across 4-channel backlight arrays without per-LED calibration. |
| 1MHz charge pump operation | Reduces required flying capacitor size and count versus 500kHz alternatives, saving PCB space and cost. |
| Built-in 400μs soft-start | Prevents inrush current spikes during power-on, protecting input supply and extending capacitor lifetime. |
| EN-pin PWM dimming linearity | Integrated standby timing (2ms) eliminates flicker and enables smooth 1–50kHz duty-cycle control. |
| Over-temperature shutdown (160°C) | Self-protects under thermal stress while maintaining full functionality below limit, no manual reset needed. |
Applications
| Mobile Phone Backlight | MP3/MP4 Player Display |
|---|---|
Use Scenario: Driving four white LEDs in a compact smartphone front-panel backlight array powered by a 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Charge pump LED driver providing regulated 20mA per channel with 1.5× voltage boost and PWM-controlled brightness. Use Value: Enables uniform illumination at low input voltage, extends battery life via 93% peak efficiency and sub-1μA shutdown current. | Use Scenario: Powering segmented WLED backlight in portable media player with variable content brightness requirements. IC Role / Device Role / Timing Role: Four-channel current source with EN-pin PWM interface for real-time luminance adjustment synchronized to UI events. Use Value: Eliminates need for external current-setting resistors per LED and supports flicker-free dimming down to 1kHz. |
| PDA Main Display | Handheld GPS Unit |
Use Scenario: Illuminating high-resolution TFT display in industrial PDA operating across -40°C to +85°C ambient range. IC Role / Device Role / Timing Role: Thermally robust LED driver with OTSD protection and guaranteed current matching over full temperature range. Use Value: Maintains display visibility and color consistency despite wide thermal swings, avoiding luminance drift. | Use Scenario: Backlighting outdoor-readable LCD in GPS navigation device with intermittent high-brightness usage. IC Role / Device Role / Timing Role: Efficient 1.5× charge pump delivering 80mA total with minimal heat generation in sealed enclosure. Use Value: Reduces thermal load vs. inductive boost converters, enabling smaller heatsinking and longer continuous operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel charge pump LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Inductive boost topology; higher peak efficiency (95%) but requires external inductor and diode; no integrated current matching. | Suitable for higher-voltage LED strings (>15V); less compact due to magnetics; lacks per-channel current balancing. | Select when driving >4 LEDs in series or needing >15V output; avoid if board space or uniformity is constrained. |
| RT9397BZSP | 4-channel charge pump with 1.33× mode only; fixed 20mA per channel; no ISET resistor programming; 600kHz fOSC. | Lower component count (no ISET resistor), but inflexible current setting and reduced dimming frequency range (≤20kHz). | Select for cost-sensitive, fixed-brightness designs where programmability and high-frequency PWM are unnecessary. |
Compared with AL8862SP-13 and RT9397BZSP, the AP3605FNTR-E1 uniquely combines resistor-programmable current, ±3% matching, 1MHz operation, and 50kHz PWM dimming - making it optimal for compact, high-uniformity, battery-powered backlight systems requiring design flexibility.
Availability
AP3605FNTR-E1 is available at Aetrix Electronics and suitable for mobile phone backlighting, portable media player displays, PDA main screens, and handheld GPS units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AP3605FNTR-E1 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 and industrial markets.
The AP3605 belongs to BCD's white LED backlight driver product line, engineered specifically for high-efficiency, small-form-factor charge pump solutions in battery-powered portable displays.
FAQ
What is the recommended flying capacitor value and type for AP3605FNTR-E1?
Two 1μF X5R or X7R ceramic capacitors are specified for C1 and C2, placed as close as possible to their respective C1±/C2± pins. These values enable stable 1MHz operation with low ESR, minimizing output ripple and thermal loss. Larger values do not improve performance and may degrade transient response.
How does the AP3605 achieve current matching across its four channels?
Current matching (±3% typical) results from matched internal current mirror transistors sharing a common 1.23V reference voltage and identical layout symmetry. The ISET resistor sets a master reference current, which is precisely mirrored to each D1–D4 output - independent of LED forward voltage variation within 3.0–4.0V range.
Can AP3605FNTR-E1 drive fewer than four LEDs, and how does that affect efficiency?
Yes - the AP3605 supports 1–4 LEDs (e.g., D1 only, or D1+D2). Efficiency remains high (≥85% at 20–40mA total) because the 1.5× charge pump and LDO operate independently of channel count. Unused D-pins must remain open; no external termination is required.
What is the minimum PWM frequency supported for EN-pin dimming, and why is 1kHz the lower limit?
The datasheet specifies 1kHz as the practical lower limit for EN-pin PWM dimming. Below this, visible flicker occurs due to human eye persistence (~16ms integration time), and the 2ms standby timing introduces nonlinearity. At 1kHz (1ms period), the 2ms delay is negligible relative to cycle duration, preserving dimming linearity and visual stability.
AP3605FNTR-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
AP3605FNTR-E1 FAQ
1.How can I place an order for AP3605FNTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3605FNTR-E1 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 AP3605FNTR-E1 reliable?
The price and inventory of AP3605FNTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3605FNTR-E1 is usually 5 days.
3.What payment methods are accepted for AP3605FNTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3605FNTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3605FNTR-E1?
AP3605FNTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3605FNTR-E1 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 AP3605FNTR-E1?
For technical support, including AP3605FNTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3605FNTR-E1 requirements.
6.How does Aetrix verify that AP3605FNTR-E1 is sourced from the original manufacturer or authorized distributors?
All AP3605FNTR-E1 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 AP3605FNTR-E1 meets industry standards.
7.What is the process for return or replacement of AP3605FNTR-E1?
All AP3605FNTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3605FNTR-E1, 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 AP3605FNTR-E1 part is unused and in its original packaging.
Return procedure for AP3605FNTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP3605FNTR-E1 Tags
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BCR402RE6327HTSA1
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BCR420UE6433HTMA1
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