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Diodes Incorporated AP3156FVG-7
- Part No.:
- AP3156FVG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
AP3156FVG-7.pdf
- Description:
- IC LED DRIVER RGLTR 20MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,017
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Product details
Overview
AP3156FVG-7 from Diodes Incorporated is a tri-mode (1X/1.5X/2X) charge pump DC/DC converter IC designed for white LED backlighting and RGB lighting. It delivers up to 25mA per channel across six independent current sinks, operates from 2.7V–5.5V input, features 32-step logarithmic current programming via single-wire SDI interface, and integrates thermal protection, auto-disable on open-circuit, and soft-start. Used in compact battery-powered displays and camera flash modules.
For engineers reviewing the AP3156FVG-7 datasheet, AP3156FVG-7 pinout, AP3156FVG-7 application, or AP3156FVG-7 equivalent, key selection criteria include its programmable 50µA–25mA per-channel current range, tri-mode efficiency optimization, QFN4040-16 thermal performance, and SDI-based real-time dimming control without PWM circuitry.
Technical Context
The AP3156 employs an internal comparator-driven mode selector that automatically chooses between 1X (pass-through), 1.5X (fractional), or 2X (voltage-doubling) charge pump operation based on LED forward voltage and input supply-maximizing power efficiency across varying VF and VIN conditions. Its six independent current sinks are each regulated with ±1.4mA accuracy at 20mA setting and 0.5% matching between channels.
Control is implemented via a single-wire Serial Digital Interface (SDI) supporting dual-sequence commands (e.g., instruction + data) with pulse-count encoding, enabling channel-grouped or individual current level updates (32 levels), low-current mode activation (down to 50µA), switching frequency selection (0.5/1/2MHz), and soft reset-all without external clock or address lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - supports single-cell Li-ion and multi-cell alkaline/battery inputs without LDO pre-regulation. |
| Max Output Current | 25mA per channel × 6 - enables full-brightness white LED backlighting or RGB color mixing with parallel sink configuration. |
| Current Programming | 32-step logarithmic scale + 4 low-current settings (50µA–2mA) - provides linear perceived brightness control and ultra-low-power standby modes. |
| Quiescent Current | 50µA in active low-current mode; <1µA in shutdown - extends battery life in always-on display or sensor interface applications. |
| Switching Frequency | 0.5 / 1 / 2 MHz - selectable via SDI to balance EMI, capacitor size, and efficiency for specific layout constraints. |
| Protection Features | Built-in thermal shutdown, VOUT short-circuit protection, open-LED auto-disable, UVLO - eliminates need for external fault monitoring circuitry. |
| Package | QFN4040-16 (4mm × 4mm, 0.5mm pitch, exposed thermal pad) - provides 46°C/W θJA for high-current LED driving in space-constrained PCBs. |
Pinout & Package
AP3156FVG-7 uses a thermally enhanced 16-pin QFN4040-16 package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad connected to GND. The package supports reflow soldering per JEDEC J-STD-020 and is RoHS-compliant with lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1–D6 | Independent constant-current sink outputs | Each drives one LED anode (cathode to GND); unused sinks must be tied to VOUT to disable with minimal leakage. |
| VOUT | Charge pump regulated output rail | Supplies all current sinks; requires 1µF ceramic capacitor to GND for stability and ripple suppression. |
| C1P/C1N, C2P/C2N | Flying capacitor terminals | Two 1µF ceramic capacitors implement tri-mode charge pump; polarity must match pin assignment to avoid malfunction. |
| VIN | Main input power supply | Accepts 2.7–5.5V; requires 1µF decoupling capacitor close to pin for transient response and noise immunity. |
| SDI | Single-wire serial digital interface | Asynchronous command input using pulse-count protocol; no clock line required; supports bit-banged MCU GPIO control. |
| GND (Pins 9,11, EP) | Power and signal reference ground | Multiple GND pins and exposed pad minimize impedance; EP must be soldered to large PCB copper area for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Tri-mode charge pump (1X/1.5X/2X) | Automatically selects optimal conversion ratio to maintain >85% efficiency across 2.7–5.5V input and 3.0–3.6V LED VF range. |
| 32-step logarithmic current control | Enables smooth, perceptually linear LED dimming from full brightness down to near-threshold visibility without PWM flicker. |
| Six independent current sinks | Supports mixed LED configurations (e.g., 3 white + 3 RGB) with individual brightness control and failure isolation per channel. |
| Ultra-low IQ in low-current mode | 50µA quiescent current at ≤2mA output enables microamp-level system sleep states while retaining LED status memory. |
| Integrated protections | Eliminates need for external thermal sensors, open-circuit detection resistors, or overvoltage clamps in portable LED systems. |
Applications
| Color (RGB) Lighting | White LED Backlighting |
|---|---|
Use Scenario: RGB LED arrays in smart lighting strips and ambient UI indicators requiring precise color mixing and dynamic hue adjustment. IC Role / Device Role / Timing Role: Six-channel programmable current sink providing independent, synchronized current control per R/G/B LED string with logarithmic scaling. Use Value: Enables 24-bit color depth via 32-level per-channel resolution and eliminates external PWM generators or DACs. | Use Scenario: Thin-profile LCD backlight in handheld medical monitors and industrial HMIs where board space and thermal headroom are constrained. IC Role / Device Role / Timing Role: High-efficiency charge pump delivering stable 20–25mA per LED string from single-cell Li-ion (3.0–4.2V) without inductors. Use Value: Reduces solution size by 40% vs. inductor-based boost converters and lowers EMI emissions in noise-sensitive analog circuits. |
| White Photo Flash | Programmable Current Sinks |
Use Scenario: Compact DSC and smartphone auxiliary flash modules needing brief high-current pulses with precise intensity control. IC Role / Device Role / Timing Role: Fast-response current driver supporting 100ms flash bursts at 25mA/channel with automatic soft-start to prevent capacitor stress. Use Value: Achieves consistent flash luminance across battery voltage range (3.2–4.8V) without closed-loop feedback or calibration. | Use Scenario: Precision analog test equipment requiring calibrated current sources for sensor biasing or LED characterization. IC Role / Device Role / Timing Role: Digitally programmable, temperature-stable current source with 0.5% inter-channel matching and 50µA minimum step. Use Value: Replaces discrete op-amp + MOSFET current sources, reducing BOM count and improving long-term drift performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP3157FVG-7 | Same pinout and SDI interface; adds I²C option and improved 0.3% current matching. | Preferred for new designs requiring factory calibration traceability or multi-master bus integration. | Select when I²C compatibility or tighter matching is required; not drop-in for legacy SDI-only firmware. |
| AL8862SP-7 | Inductor-based boost controller; fixed 20mA per channel; no logarithmic dimming or tri-mode operation. | Suitable only for static-brightness white LED backlights with higher VIN (>4.5V) and relaxed EMI limits. | Choose only if inductor use is acceptable and SDI programmability is unnecessary; requires different layout and compensation. |
Compared with AP3157FVG-7, the AP3156FVG-7 offers lower cost and simpler firmware but lacks I²C and tighter matching; versus AL8862SP-7, it eliminates inductors and enables dynamic dimming, though at slightly lower peak efficiency above 4.5V.
Availability
AP3156FVG-7 is available at Aetrix Electronics and suitable for white LED backlighting, RGB lighting, and white photo flash applications requiring stable component supply, RoHS compliance, and thermally robust QFN packaging.
Supply support for AP3156FVG-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 AP3156 belongs to Diodes' LED driver product line, engineered specifically for high-efficiency, inductorless backlight and flash applications in portable electronics where size, EMI, and battery life are critical constraints.
FAQ
What is the maximum total output current capability of the AP3156FVG-7?
The AP3156FVG-7 supports up to 25mA per channel across six independent current sinks, yielding a maximum combined output of 150mA when all channels operate in parallel. This is achievable under 2.7V–5.5V input with proper thermal management via the exposed pad and PCB copper area, and remains within absolute maximum ratings of 150mA total DC output current and 150°C junction temperature.
How does the tri-mode charge pump improve efficiency compared to fixed-ratio converters?
The AP3156's tri-mode architecture dynamically selects 1X (bypass), 1.5X (fractional), or 2X (doubling) operation based on real-time comparison of VOUT and LED forward voltage. This avoids excessive voltage overhead and associated conduction losses-e.g., using 1.5X instead of 2X when VF = 3.3V and VIN = 3.7V improves efficiency by ~12% versus fixed 2X mode, as confirmed in typical performance curves on page 6 of the datasheet.
Can the AP3156FVG-7 drive LEDs with forward voltages exceeding VOUT in 1X mode?
No. In 1X mode, VOUT ≈ VIN, so the device cannot drive LEDs with VF > VIN. However, the automatic mode selection engages 1.5X or 2X conversion when VF exceeds available VOUT-e.g., at VIN = 2.7V and VF = 3.6V, the IC switches to 2X mode to generate ~5.4V at VOUT. This transition occurs at a 150mV threshold per sink, ensuring reliable operation without external mode control logic.
What external components are required for basic AP3156FVG-7 operation?
Only four 1µF X5R/X7R ceramic capacitors: one input (CIN), one output (COUT), and two flying capacitors (C1, C2). No inductors, diodes, or resistors are needed. The SDI interface requires only a pull-up resistor (10kΩ typical) to VIN. Diodes Incorporated's recommended pad layout (AP02001) and 2oz copper PCB guidelines ensure thermal and electrical performance per datasheet specifications.
AP3156FVG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- 500kHz ~ 2MHz
- Dimming:
- -
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- QFN4040-16
AP3156FVG-7 FAQ
1.How can I place an order for AP3156FVG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP3156FVG-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 AP3156FVG-7 reliable?
The price and inventory of AP3156FVG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3156FVG-7 is usually 5 days.
3.What payment methods are accepted for AP3156FVG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3156FVG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP3156FVG-7?
AP3156FVG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP3156FVG-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 AP3156FVG-7?
For technical support, including AP3156FVG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3156FVG-7 requirements.
6.How does Aetrix verify that AP3156FVG-7 is sourced from the original manufacturer or authorized distributors?
All AP3156FVG-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 AP3156FVG-7 meets industry standards.
7.What is the process for return or replacement of AP3156FVG-7?
All AP3156FVG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP3156FVG-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 AP3156FVG-7 part is unused and in its original packaging.
Return procedure for AP3156FVG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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