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NXP Semiconductors MC34844EPR2
- Part No.:
- MC34844EPR2
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
MC34844EPR2.pdf
- Description:
- IC LED DRVR RGLTR PWM 50MA 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,627
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Product details
Overview
MC34844EPR2 from NXP Semiconductors (formerly Freescale) is a 10-channel SMARTMOS LED backlight driver with integrated 2.5 A boost converter, designed for LCD displays from 10" to 42". It operates from 7.0–28 V input, delivers up to 80 mA per channel with ±2% current matching, supports 256-level I²C-programmable PWM dimming, and features Dynamic Headroom Control for >90% DC/DC efficiency in monitor and HDTV backlight systems.
For engineers reviewing the MC34844EPR2 datasheet, MC34844EPR2 pinout, MC34844EPR2 application, or MC34844EPR2 equivalent, this page provides verified technical context on boost frequency programming (160–1300 kHz), dual-mode dimming (I²C DAC + analog PIN/NIN scaling), fault protection (OVP/OCP/OTP), and synchronized multi-device operation via CK/M/~S interface - all critical for portable display power architecture validation.
Technical Context
The MC34844EPR2 integrates a non-synchronous boost controller with internal 2.5 A FET and Dynamic Headroom Control (DHC), which senses LED string voltage and dynamically adjusts VOUT to the minimum required level-reducing power loss and enabling >90% peak efficiency. Its 10-channel current mirror uses matched sink transistors with ±2% matching across -40°C to 105°C.
It supports three operational modes: Manual (EN-controlled), SM Bus (bus-activated with watchdog), and I²C (full register control), each with distinct power-up sequencing and shutdown behavior. The device implements hardware OVP via A0/SEN (6.5 V threshold) and software-configurable OVP (11–62 V in ~4 V steps), plus optical/temperature closed-loop capability via TEMP/OPTO interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.0 V to 28 V - powers logic regulators (VDC1/VDC2/VDC3) and feeds boost stage; UVLO at 6.0 V (±0.4 V hysteresis). |
| LED Channel Current | Up to 80 mA per channel (typical), programmable via I²C DAC or analog scaling at PIN/NIN - enables precise brightness control across 10 parallel strings. |
| Current Matching Accuracy | ±2.0% - ensures uniform luminance across all 10 LED strings without external calibration, critical for high-end display uniformity. |
| Boost Switching Frequency | Programmable: 160 / 320 / 650 / 1300 kHz - higher frequencies allow smaller inductors/capacitors; default 320 kHz balances EMI and efficiency. |
| PWM Dimming Resolution | 256 levels (8-bit), with 0.39% dimming step resolution - supports smooth, flicker-free brightness transitions down to 0.4% duty cycle. |
| Integrated Protection | OVP (hardware/software), OTP (150°C trip), LED open/short detection, undervoltage lockout, and boost overcurrent limiting - eliminates need for discrete protection circuitry. |
| Package | 32-pin 5×5×1.0 mm TQFN-EP - exposed pad enhances thermal dissipation; junction-to-case RθJC = 3.5°C/W supports sustained 2.5 A boost operation. |
Pinout & Package
MC34844EPR2 is housed in a 32-lead 5 mm × 5 mm × 1.0 mm thermally enhanced TQFN package with exposed pad (EP) tied to GND for optimal heat transfer. Pin 1 is located at top-left corner (A1) per JEDEC MO-220 standard; EP must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies boost stage and internal LDOs; accepts 7–28 V; UVLO disables IC below 6.0 V. |
| I0–I9 | LED string sinks | 10 independent current-sink outputs; each drives up to 80 mA with ±2% matching; requires external return path to VOUT. |
| SWA / SWB | Boost switch nodes | Connect to external boost inductor; SWA is primary switch node, SWB is auxiliary for interleaved operation (if used). |
| VOUT | Boost output sense | Feedback input for boost regulation; monitors output voltage for DHC and OVP functions; not a power output pin. |
| CK / M/~S | Sync clock I/O & mode select | M/~S = high → CK outputs master clock (110–27 kHz); M/~S = low → CK accepts external sync signal for multi-device synchronization. |
| A0/SEN | OVP hardware control | Configures hardware OVP threshold (6.5 V typ.) via resistor divider or zener; also serves as I²C address select. |
| FAIL | Open-drain fault flag | High-impedance during fault (OVP/OTP/LED open/short); pulled low otherwise - enables system-level fault reporting without polling. |
| SCK / SDA | I²C interface | Standard bidirectional SM Bus/I²C interface (400 kHz max); supports 7-bit address 0x76 (1110110b) for configuration and monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Automatically minimizes VOUT to just above total LED forward voltage - reduces power loss in boost stage and improves overall system efficiency beyond 90%. |
| Dual Dimming Architecture | Combines 256-step I²C PWM (110 Hz–27 kHz) with analog current scaling (PIN/NIN) - enables hybrid dimming for ultra-low-frequency flicker suppression and fine-grained brightness control. |
| Multi-Device Synchronization | Master/slave mode via M/~S pin and CK pin - allows precise phase alignment of PWM and boost clocks across multiple MC34844EPR2 devices in large-panel or tiled-display systems. |
| Hardware + Software OVP | Configurable OVP from 11 V to 62 V (I²C) or fixed 6.5 V (A0/SEN) - provides redundant overvoltage protection for LED string reliability under temperature drift or open-circuit conditions. |
| Thermal & Fault Protection Suite | Integrated OTP (150°C trip), LED open/short detection, boost overcurrent limit (2.5 A), and undervoltage lockout - eliminates need for external protection ICs in display power designs. |
Applications
| Monitor Backlight Systems | HDTV Panel Lighting |
|---|---|
|
Use Scenario: Driving 10 parallel LED strings (16 LEDs/string) in 24"–32" LCD monitors with dynamic contrast and local dimming support. IC Role / Device Role / Timing Role: Primary LED current controller and boost power supply; regulates per-string current and synchronizes PWM dimming across all channels. Use Value: ±2% current matching ensures uniform screen luminance; DHC reduces boost losses by up to 35% vs fixed-output designs, lowering thermal load on display PCB. |
Use Scenario: Backlighting 42" HDTV panels requiring high-brightness operation (>500 nits) and wide dimming range (0.1%–100%). IC Role / Device Role / Timing Role: Centralized LED driver with synchronized multi-chip operation; coordinates timing between boost switching and PWM dimming for zero-flicker video playback. Use Value: 256-level PWM + analog scaling enables seamless 65,000:1 dimming ratio; thermal protection prevents luminance drift during extended high-brightness scenes. |
| Notebook Display Power | GPS & Automotive Infotainment |
|
Use Scenario: Slim-profile notebook LCD backlight where board space and thermal management are constrained. IC Role / Device Role / Timing Role: Integrated power solution combining boost conversion and 10-channel current control in single 5×5 mm package. Use Value: Eliminates discrete boost controller and 10-channel current sources; 90% efficiency and 3.5°C/W θJC enable passive cooling in thin chassis. |
Use Scenario: Sunlight-readable GPS and automotive infotainment displays operating across -40°C to 105°C ambient. IC Role / Device Role / Timing Role: Robust LED driver with automotive-grade thermal protection, OVP, and wide-input operation for vehicle battery fluctuations. Use Value: Hardware OVP (6.5 V) and OTP (150°C) ensure fail-safe operation during cold cranking or engine bay heat soak; AEC-Q100 qualified reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMYX/NOPB | Single-channel buck-boost LED driver; no integrated current mirror; requires external MOSFET and current sensing; no I²C interface. | Best suited for custom multi-string designs with discrete current sinks; lacks native 10-channel matching and DHC. | Select when full design flexibility is needed and system-level current matching is handled externally. |
| TPS61165DRVR | 6-channel boost LED driver; 30 mA/channel max; I²C interface; no hardware OVP pin; lower integration (no integrated 2.5 A FET). | Targeted at smaller displays (<20"); lacks thermal protection, multi-device sync, and high-current capability for large panels. | Choose for cost-sensitive, space-constrained portable displays where 10-channel drive and 80 mA/channel are unnecessary. |
Compared with LM3409QMYX/NOPB and TPS61165DRVR, the MC34844EPR2 uniquely combines 10-channel ±2% matching, integrated 2.5 A boost FET, hardware/software OVP, and master/slave synchronization - making it the only single-package solution for high-reliability, large-format LCD backlighting with minimal BOM count and layout area.
Availability
MC34844EPR2 is available at Aetrix Electronics and suitable for monitor backlight systems, HDTV panel lighting, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and automotive-grade thermal robustness.
Supply support for MC34844EPR2 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
NXP Semiconductors acquired Freescale in 2015 and continues to support legacy analog power products including the MC34844 family. NXP is a global leader in secure connectivity solutions for automotive, industrial, and consumer applications.
The MC34844EPR2 belongs to NXP's SMARTMOS LED backlight driver product line, engineered specifically for high-efficiency, high-reliability LCD display power management in demanding environments - emphasizing thermal resilience, multi-device synchronization, and integrated protection.
FAQ
What is the maximum LED string voltage supported by the MC34844EPR2?
The MC34844EPR2 supports up to 60 V on the VOUT pin, with programmable overvoltage protection ranging from 11 V to 62 V in ~4 V steps. Its Dynamic Headroom Control automatically adjusts the boost output to the minimum voltage required across all 10 LED strings, ensuring safe operation while maximizing efficiency. Hardware OVP via the A0/SEN pin provides an additional 6.5 V threshold for fail-safe protection.
How does the MC34844EPR2 achieve ±2% current matching across 10 channels?
The MC34844EPR2 achieves ±2% current matching using a precision 10-channel current mirror fabricated in SMARTMOS process technology, with on-chip trimming and temperature compensation. This matching is guaranteed over the full -40°C to 105°C operating range and does not require external calibration. Each channel (I0–I9) delivers up to 80 mA with matched sink transistor characteristics and shared reference current derived from the ISET resistor.
Can the MC34844EPR2 operate without an I²C interface?
Yes, the MC34844EPR2 supports Manual Mode where I²C pins (SCK/SDA) are tied low and control is handled entirely via EN, PWM, and analog inputs (PIN/NIN). In this mode, LED current is set by the ISET resistor, dimming is controlled by the external PWM signal applied to the PWM pin, and OVP is configured via the A0/SEN hardware pin - enabling full functionality without firmware or bus communication.
What thermal management provisions does the MC34844EPR2 include?
The MC34844EPR2 integrates overtemperature protection (OTP) with a 150°C trip point and 25°C hysteresis, plus a thermally enhanced 32-pin TQFN package with exposed pad (EP) offering 3.5°C/W junction-to-case thermal resistance. The EP must be soldered to a PCB ground plane for effective heat dissipation. Internal thermal shutdown prevents damage during sustained overload or high-ambient conditions.
How is multi-device synchronization implemented on the MC34844EPR2?
Multi-device synchronization is implemented using the CK pin and M/~S pin: when M/~S = high, the device operates in Master mode and outputs a synchronized clock on CK; when M/~S = low, it enters Slave mode and accepts an external clock on CK. This allows precise phase alignment of PWM dimming and boost switching across multiple MC34844EPR2 devices - essential for flicker-free operation in large or tiled displays.
MC34844EPR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 10
- Voltage - Supply (Min):
- 7V
- Voltage - Supply (Max):
- 28V
- Voltage - Output:
- 8V ~ 60V
- Current - Output / Channel:
- 50mA
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN-EP (5x5)
MC34844EPR2 FAQ
1.How can I place an order for MC34844EPR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34844EPR2 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 MC34844EPR2 reliable?
The price and inventory of MC34844EPR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34844EPR2 is usually 5 days.
3.What payment methods are accepted for MC34844EPR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34844EPR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34844EPR2?
MC34844EPR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34844EPR2 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 MC34844EPR2?
For technical support, including MC34844EPR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34844EPR2 requirements.
6.How does Aetrix verify that MC34844EPR2 is sourced from the original manufacturer or authorized distributors?
All MC34844EPR2 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 MC34844EPR2 meets industry standards.
7.What is the process for return or replacement of MC34844EPR2?
All MC34844EPR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34844EPR2, 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 MC34844EPR2 part is unused and in its original packaging.
Return procedure for MC34844EPR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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