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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated AP3612M28TR-G1

Name: AP3612M28TR-G1
Brand: Diodes Incorporated
SKU: AP3612M28TR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP3612M28TR-G1

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

Package:: 28-BSOP (0.295", 7.50mm Width) + 2 Heat Tabs

Datasheet:: AP3612M28TR-G1.pdf

Description:: IC LED DRVR CTRL PWM 75MA 28HSOP

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Product details

Overview

AP3612M28TR-G1 from BCD Semiconductor is a boost-type 12-channel WLED backlight driver IC with integrated current sinks, operating from 4.5V to 33V input and delivering up to 75mA per string with 1.5% typical current matching. It features programmable switching frequency (100kHz–1MHz), external PWM dimming, and comprehensive protection including OVP, OTP, LED open/short, and Schottky diode short-circuit detection. Used in LCD TV backlight systems requiring high channel count and tight current regulation.

For engineers reviewing the AP3612M28TR-G1 datasheet, AP3612M28TR-G1 pinout, AP3612M28TR-G1 application, or AP3612M28TR-G1 equivalent, key selection criteria include 12-string parallel drive capability, HSOP-28 thermal performance (θ_JA = 59°C/W), ISET-based current programming, and status-flag reporting for fault diagnostics in large-area displays.

Technical Context

The AP3612M28TR-G1 implements a fixed-frequency current-mode boost controller with 12 independent current-sink outputs, each capable of sinking up to 75mA. Its internal error amplifier drives a gate driver (OUT pin) for an external N-MOSFET, while the CS pin monitors switch current for cycle-by-cycle overcurrent protection at 540mV threshold.

Protection logic is hierarchical: OVP (2.0V threshold, 250mV hysteresis) and LED open detection take priority over short-circuit detection (7.3V CHx threshold), and all faults assert low on the STATUS pin. The DIM pin accepts 100Hz–20kHz PWM signals for linear brightness control without altering current regulation accuracy.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 33V - supports wide-range industrial and display power rails, including 12V/24V DC systems.
Max Output Current per String	75mA - enables driving high-brightness WLED strings with up to 13 LEDs in series.
Current Matching Accuracy	1.5% (typ) - ensures uniform luminance across 12 backlight zones without per-string calibration.
Switching Frequency Range	100kHz to 1MHz - allows trade-off between inductor size (high-freq) and conduction loss (low-freq).
OVP Threshold	2.0V ±0.1V - sets output overvoltage limit via external resistor divider; hysteresis prevents chatter.
Thermal Shutdown Temp	160°C - protects against sustained overload or poor heatsinking in enclosed display enclosures.
PWM Dimming Frequency	100Hz to 20kHz - avoids audible noise while enabling smooth 1%–100% brightness scaling.
Shutdown Supply Current	≤3µA - minimizes standby power in always-on display subsystems.

Pinout & Package

AP3612M28TR-G1 is housed in a thermally enhanced HSOP-28 package (17.89 × 10.65 mm, 1.27 mm pitch), optimized for surface-mount assembly and heat dissipation in backlight driver PCBs. Pin 1 is marked by a dot; pin 14 is GND; pin 28 is CH1.

Pin/Terminal	Circuit Role	Design Meaning
CH1–CH12	LED current sink output	12 independent cathode connections; each sinks programmed current; open if unused.
ISET	Current reference input	Resistor-to-GND sets max current per string (e.g., 6.67kΩ → 60mA).
EN	Enable control input	Logic-high (>2.4V) enables operation; <0.5V disables IC, reducing supply current to ≤3µA.
DIM	PWM dimming input	Accepts external PWM signal (100Hz–20kHz) to modulate all 12 strings synchronously.
STATUS	Fault status output	Open-drain logic-low indicates any active protection event (OVP, OTP, LED open/short, etc.).
OUT	Gate driver output	Drives external N-MOSFET gate with 5V/V_IN−0.5V swing; requires external bootstrap circuitry.
CS	Current sense input	Monitors MOSFET source voltage; triggers shutdown at 540mV (OCP) or 800mV (Schottky short).
OVP	Overvoltage sense input	Connected to resistor divider on V_OUT; trips at 2.0V to disable boost stage during open-loop fault.

Key Features

Feature	Design Value
12-channel current matching	1.5% typical mismatch enables uniform backlight luminance without per-string trimming.
Programmable soft-start	Controlled via COMP pin capacitor; prevents inrush current and output overshoot during startup.
VOUT short/Schottky open protection	Monitors OVP pin voltage <0.1V to detect failed diode or shorted output, disabling gate drive immediately.
LED short-circuit detection	Triggers at ~7.3V on any CHx pin, latching off that string while others remain operational.
External frequency setting	RT pin accepts 100kΩ resistor to set ~520kHz switching frequency, balancing efficiency and EMI.
Integrated 5V LDO (VCC)	Supplies internal circuitry and bias; bypassed with 2.2µF ceramic capacitor for stable reference generation.

Applications

Large-Screen LCD TV Backlight

Commercial Display Module

Use Scenario: Driving 12 parallel WLED strings behind a 55-inch LCD panel with 13 LEDs per string.

IC Role / Device Role / Timing Role: Primary boost controller and current regulator; manages constant-current delivery and real-time fault monitoring across all strings.

Use Value: Eliminates need for discrete current-setting resistors per string, reduces BOM count by >90%, and maintains <2% luminance variation across full screen.

Use Scenario: Backlighting a 32-inch industrial HMI display operating in extended temperature (-40°C to 85°C).

IC Role / Device Role / Timing Role: High-reliability LED driver with OTP, UVLO, and latch-off protections for unattended operation.

Use Value: Prevents catastrophic failure under thermal stress or input brownout, extending field lifetime beyond 50,000 hours.

Medical Imaging Monitor

Digital Signage Panel

Use Scenario: Precision backlight for DICOM-compliant diagnostic monitor requiring grayscale stability.

IC Role / Device Role / Timing Role: Constant-current source with <1.5% inter-string matching and PWM dimming linearity <±1%.

Use Value: Ensures consistent gamma curve and luminance uniformity across clinical viewing angles and ambient conditions.

Use Scenario: Outdoor-facing digital signage with variable brightness control based on ambient light.

IC Role / Device Role / Timing Role: High-efficiency boost driver supporting 100Hz–10kHz PWM dimming and robust OVP/OCP for unstable grid power.

Use Value: Enables automatic daylight-adaptive brightness while maintaining >92% peak efficiency at 60mA/string.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-channel WLED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8862T-13	6-string driver with external current mirrors required for 12-channel operation; lower max current (60mA); no integrated STATUS flag.	Suitable only when board space permits discrete mirroring and fault reporting is handled externally.	Select if cost sensitivity outweighs integration benefits and thermal budget allows SOIC-16 + mirror FETs.
LM3409QMY/NOPB	Single-channel buck-boost LED driver; requires 12 identical copies plus external current sharing; no native multi-string sync.	Used in legacy designs where channel independence and individual dimming are mandatory.	Choose only for retrofit compatibility or when per-string analog dimming is required beyond PWM.

Compared with AL8862T-13 and LM3409QMY/NOPB, AP3612M28TR-G1 delivers full 12-channel integration in one HSOP-28 package, eliminates external current-setting components, and provides unified fault signaling-reducing PCB area by ≥40% and system-level validation effort.

Availability

AP3612M28TR-G1 is available at Aetrix Electronics and suitable for LCD TV backlighting, commercial display modules, medical imaging monitors, and digital signage panels requiring stable component supply, RoHS-compliant green packaging, and long-term production continuity.

Supply support for AP3612M28TR-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 fabless analog IC designer specializing in high-voltage, high-efficiency power management solutions for consumer, industrial, and automotive markets.

The AP3612 belongs to BCD's WLED backlight driver product line, engineered specifically for large-format LCD displays requiring high channel count, tight current matching, and robust fault resilience in thermally constrained environments.

FAQ

What is the function of the ISET pin on AP3612M28TR-G1?

The ISET pin sets the maximum LED current for all 12 channels via an external resistor to GND. A 6.67kΩ resistor yields 60mA per string; values from 5.33kΩ (75mA) to 20kΩ (20mA) are supported. The relationship is linear: I_LED = 400 mA × (10 kΩ / R_ISET). No calibration or trimming is needed.

How does the STATUS pin indicate fault conditions?

The STATUS pin is an open-drain output that pulls low during any active protection event: LED open/short, OVP trigger, OTP shutdown, VOUT short, Schottky diode failure, or abnormal condition latch. It remains low until the fault clears and EN is toggled or VIN is cycled. A pull-up resistor to VCC is required for proper logic-level interpretation.

Can AP3612M28TR-G1 drive more than 13 LEDs in series per string?

No. The absolute maximum CHx pin voltage is 65V, and the recommended operating limit is 60V. At 3.3V per white LED, 13 LEDs yield ~43V, leaving ~17V margin for forward drop and ripple. Exceeding 13 LEDs risks violating V_CH rating under transient conditions and may trigger OVP or reduce reliability.

What thermal derating applies to AP3612M28TR-G1 in HSOP-28 package?

With θ_JA = 59°C/W and T_JMAX = 150°C, maximum allowable power dissipation at 85°C ambient is (150 − 85) / 59 ≈ 1.1W. For 24V input and 60V output at 60mA/string, estimated losses exceed this above ~8 strings unless PCB copper area ≥4 cm² is used for heatsinking. Derate current by 10% per 10°C ambient rise above 65°C.

AP3612M28TR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 28-BSOP (0.295", 7.50mm Width) + 2 Heat Tabs

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: DC DC Controller

Topology:: Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 12

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 33V

Voltage - Output:: -

Current - Output / Channel:: 75mA

Frequency:: 100kHz ~ 1MHz

Dimming:: PWM

Applications:: Backlight

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-HSOP

AP3612M28TR-G1 FAQ

1.How can I place an order for AP3612M28TR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP3612M28TR-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 AP3612M28TR-G1 reliable?

The price and inventory of AP3612M28TR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP3612M28TR-G1 is usually 5 days.

3.What payment methods are accepted for AP3612M28TR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP3612M28TR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP3612M28TR-G1?

AP3612M28TR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP3612M28TR-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 AP3612M28TR-G1?

For technical support, including AP3612M28TR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP3612M28TR-G1 requirements.

6.How does Aetrix verify that AP3612M28TR-G1 is sourced from the original manufacturer or authorized distributors?

All AP3612M28TR-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 AP3612M28TR-G1 meets industry standards.

7.What is the process for return or replacement of AP3612M28TR-G1?

All AP3612M28TR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AP3612M28TR-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 AP3612M28TR-G1 part is unused and in its original packaging.

Return procedure for AP3612M28TR-G1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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