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NXP Semiconductors MC34845CEPR2
- Part No.:
- MC34845CEPR2
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
MC34845CEPR2.pdf
- Description:
- IC LED DRVR RGLTR PWM 2.3A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,238
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Product details
Overview
MC34845CEPR2 from NXP Semiconductors is a six-channel LED backlight driver IC with integrated 2.0 A boost FET, designed for edge-lit LCD displays from 10" to 17". It operates from 5.0 V to 21 V input, delivers up to 60 V boost output, supports 3.0–30 mA per channel with ±2% current matching, and features PWM dimming, dynamic headroom control, and comprehensive fault protection including LED open/short, overtemperature, overcurrent, and overvoltage detection.
For engineers reviewing the MC34845CEPR2 datasheet, MC34845CEPR2 pinout, MC34845CEPR2 application, or MC34845CEPR2 equivalent, this device is selected for mid-size portable display power management where high channel-to-channel current accuracy, integrated boost efficiency, single-wire wake control, and robust thermal/fault handling are required in space-constrained QFN-EP layouts.
Technical Context
The MC34845CEPR2 implements a current-mode boost converter with Dynamic Headroom Control (DHC) that automatically adjusts VOUT to match LED string voltage requirements above 400 ns pulse width, minimizing power loss. Its six independent current-sink channels use matched internal circuitry to maintain ≤±2% ILED tolerance across all strings under 3–30 mA operating range.
It integrates SMARTMOS technology for high-voltage capability and thermal resilience, supports dual low-power entry modes-EN-active standby and WAKE-triggered shutdown-and provides fail-safe protection via dedicated FAIL pin, programmable OVP (15–60 V), and cycle-by-cycle overcurrent limiting with 10 ms timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.0 V to 21 V - powers directly from 2–3-cell Li-ion or 12 V rail without pre-regulation |
| Boost Output Voltage | Up to 60 V - sufficient for driving up to 16-series LEDs at typical forward voltages |
| Integrated Boost FET | 2.0 A min switch current limit - enables compact external inductor selection and reduces BOM count |
| Switching Frequency | 600 kHz (typical) - allows smaller magnetics and faster transient response vs. 300 kHz variants |
| LED Current Accuracy | ±2% max channel-to-channel tolerance - ensures uniform brightness across multi-string backlight panels |
| OVP Protection | Internally fixed 60 V (typ) + externally programmable down to 15 V - dual-layer safety against LED string failure |
| Thermal Resistance | Junction-to-case 3.1 °C/W - enables high-power operation with EP pad thermal anchoring |
Pinout & Package
MC34845CEPR2 is housed in a thermally enhanced 24-pin QFN-EP package (98ASA00602D), with exposed pad (EP) tied to GND for low-thermal-resistance heat dissipation. Pin layout follows standard top-view orientation with VIN, SWA/SWB, CH1–CH6, and dedicated control/compensation pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 5–21 V; powers internal LDOs and boost controller; UVLO threshold 4.0–4.4 V |
| SWA / SWB | Boost switch nodes | Connect to external inductor/diode; support 2.0 A peak current; RDS(on) ≤ 520 mΩ |
| CH1–CH6 | LED current sinks | Each drives up to 30 mA; off-state leakage ≤ 1.0 μA at 45 V; VMIN = 0.75 V (typ) |
| ISET | Current programming | Resistor-to-GND sets ILED via RSET = 153 / ILED; 0.1% resistor recommended |
| PWM | Dimming control | Direct PWM input (DC–100 kHz); controls LED on/off timing; 10%–100% linear dimming |
| EN | Enable control | Active-high logic; internal pull-down; <2.0 μA shutdown current when low |
| WAKE | Single-wire standby | Enables low-power mode when tied to PWM and EN grounded; 27–33 ms timeout |
| OVP | External overvoltage sense | Resistor divider from VOUT to GND sets OVP threshold between 15–60 V; reference 6.9 V (typ) |
| FAIL | Fault indicator | Open-drain output; low-impedance during normal operation; high-Z on any fault detection |
| GND / PGNDA / PGNDB / EP | Ground terminals | Separate analog/digital and power grounds; EP must be soldered for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Automatically adjusts VOUT to minimum required voltage per LED string, reducing power loss and heat generation |
| Six independent current sinks | Each channel delivers 3–30 mA with ≤±2% matching - eliminates need for external current-setting resistors per channel |
| Programmable overvoltage protection | OVP threshold set via external resistor divider (15–60 V range), backed by fixed 60 V internal clamp |
| Integrated fault diagnostics | Detects LED open/short, overtemperature (150 °C shutdown), overcurrent, and UVLO - signaled via open-drain FAIL pin |
| Low-power wake mode | Single-wire control using PWM + WAKE tie-off enables standby without additional enable logic or PCB traces |
Applications
| PC Notebook Backlight | Industrial Display Panel |
|---|---|
Use Scenario: Driving edge-lit 13.3"–15.6" LCD panel in battery-powered notebook with adaptive brightness control. IC Role / Device Role / Timing Role: Six-channel constant-current LED driver with integrated boost converter and PWM dimming interface. Use Value: Enables uniform backlighting with <±2% current matching across all strings, extending battery life via 90% peak boost efficiency and low 2.0 μA shutdown current. | Use Scenario: Powering ruggedized 12" HMI display in factory automation equipment requiring long-term reliability and thermal stability. IC Role / Device Role / Timing Role: High-integrity LED driver with overtemperature shutdown (150 °C), LED open/short detection, and fail-safe FAIL pin reporting. Use Value: Ensures continuous operation under ambient temperatures up to 85 °C and prevents catastrophic failure during LED string faults via automatic channel disable and system-level alert signaling. |
| Portable DVD Player | Healthcare Device Display |
Use Scenario: Compact backlight solution for 7"–10" portable media player with variable content brightness and minimal board area. IC Role / Device Role / Timing Role: Integrated boost + six-channel sink driver with 24-pin QFN-EP package and single-wire wake control. Use Value: Reduces component count by integrating 2.0 A FET and dual LDOs (2.5 V/6.0 V), while enabling ultra-low standby power via WAKE-triggered shutdown (27 ms timeout). | Use Scenario: Clinical monitor display requiring flicker-free dimming, consistent color rendering, and ESD-robust operation in hospital environments. IC Role / Device Role / Timing Role: Precision LED current controller with ±2% matching, 2 kV HBM ESD rating, and stable 600 kHz switching for low-noise operation. Use Value: Delivers medically acceptable brightness uniformity and eliminates visible PWM artifacts through precise 600 Hz–100 kHz dimming control and <75 ns channel rise/fall times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34845DEPR2 | 300 kHz boost frequency, higher boost current limit (2.1–2.6 A), different slope compensation (0.22 V/μs) | Better suited for lower EMI-sensitive designs or higher-output-voltage applications requiring longer duty cycles | Select when lower switching noise or higher boost headroom is prioritized over compact magnetics size |
| TPS61196RTVR | TI part; 6-channel, 300 kHz, 1.5 A FET, no integrated DHC, requires external OVP diode network | Lacks dynamic headroom control and failsafe internal OVP; relies on external components for critical protections | Choose only if existing TI ecosystem integration outweighs loss of autonomous VOUT optimization and dual-layer OVP |
Compared with MC34845DEPR2 and TPS61196RTVR, the MC34845CEPR2 offers superior thermal efficiency via 600 kHz DHC operation, tighter current matching, and built-in fail-safe OVP - making it optimal for space-constrained, high-reliability portable displays where autonomous voltage regulation and robust fault coverage are essential.
Availability
MC34845CEPR2 is available at Aetrix Electronics and suitable for PC notebooks, industrial HMIs, and portable medical displays requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing for production ramp-up.
Supply support for MC34845CEPR2 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 is a global semiconductor leader delivering secure, scalable solutions for automotive, industrial, IoT, and mobile applications, with deep expertise in power management and analog mixed-signal design.
The MC34845 series belongs to NXP's SMARTMOS-based LED backlight driver product line, engineered specifically for energy-efficient, high-accuracy LCD backlighting in mid-size portable and industrial displays - emphasizing thermal resilience, integrated protection, and simplified system design.
FAQ
What is the maximum LED string voltage supported by the MC34845CEPR2?
The MC34845CEPR2 supports a maximum boost output voltage of 60 V (typical), which corresponds to the internally fixed overvoltage protection threshold. When using external OVP programming, the upper limit remains 60 V, and the minimum programmable level is 15 V. This allows safe operation with LED strings up to ~16 series-connected white LEDs (assuming ~3.5 V VF each), provided the external OVP resistor divider is correctly configured to avoid exceeding the 45 V off-state voltage rating of the CHx pins.
How does the Dynamic Headroom Control (DHC) function in the MC34845CEPR2?
The Dynamic Headroom Control in the MC34845CEPR2 continuously monitors LED string voltage and dynamically adjusts the boost converter output (VOUT) to the minimum level required to maintain regulation - reducing power dissipation and heat generation. It operates only when LED channel pulse widths exceed 400 ns; below that, the DHC loop is inactive and VOUT defaults to the programmed OVP level minus total LED forward voltage, necessitating careful OVP selection to prevent CHx overvoltage.
Can the MC34845CEPR2 drive more than six LED strings?
No, the MC34845CEPR2 is strictly a six-channel LED driver with dedicated CH1–CH6 pins; it cannot natively drive more than six independent strings. Each channel is a matched current sink rated for 3–30 mA. To drive additional strings, multiple MC34845CEPR2 devices must be synchronized externally - though no master/slave or inter-device sync capability is built into the IC, requiring discrete timing coordination.
What is the purpose of the WAKE pin on the MC34845CEPR2?
The WAKE pin on the MC34845CEPR2 enables single-wire low-power standby mode: when WAKE and PWM are shorted and EN is held low, the device enters shutdown after 27–33 ms of low PWM state, drawing only ~2.0 μA. This eliminates the need for a separate enable signal in space-constrained designs, allowing full power control using only the PWM signal - ideal for portable devices where pin count and PCB routing are critical.
Does the MC34845CEPR2 require external compensation components for stable boost operation?
Yes, the MC34845CEPR2 uses external Type II compensation via the COMP pin, requiring a series RC network (resistor + capacitor) to ground and a shunt capacitor. Recommended values for 600 kHz operation are RCOMP = 2.0 kΩ, CCOMP1 = 33 nF, and CCOMP2 = 220 pF. The compensation network stabilizes the current-mode boost loop and suppresses output ripple; incorrect values may cause oscillation or poor transient response.
MC34845CEPR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 21V
- Voltage - Output:
- 8V ~ 60V
- Current - Output / Channel:
- 2.3A (Switch)
- Frequency:
- 600kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN-EP (4x4)
MC34845CEPR2 FAQ
1.How can I place an order for MC34845CEPR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34845CEPR2 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 MC34845CEPR2 reliable?
The price and inventory of MC34845CEPR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34845CEPR2 is usually 5 days.
3.What payment methods are accepted for MC34845CEPR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34845CEPR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34845CEPR2?
MC34845CEPR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34845CEPR2 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 MC34845CEPR2?
For technical support, including MC34845CEPR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34845CEPR2 requirements.
6.How does Aetrix verify that MC34845CEPR2 is sourced from the original manufacturer or authorized distributors?
All MC34845CEPR2 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 MC34845CEPR2 meets industry standards.
7.What is the process for return or replacement of MC34845CEPR2?
All MC34845CEPR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34845CEPR2, 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 MC34845CEPR2 part is unused and in its original packaging.
Return procedure for MC34845CEPR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC34845CEPR2 Tags
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