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NXP Semiconductors MC34845BEPR2
- Part No.:
- MC34845BEPR2
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
MC34845BEPR2.pdf
- Description:
- IC LED DRVR RGLTR PWM 2.6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,837
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Product details
Overview
MC34845BEPR2 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 MC34845BEPR2 datasheet, MC34845BEPR2 pinout, MC34845BEPR2 application, or MC34845BEPR2 equivalent, this device is selected for mid-size portable display power management where precise multi-string current regulation, compact QFN-EP packaging, and single-wire wake-up capability are required in notebook, netbook, and industrial display designs.
Technical Context
The MC34845BEPR2 integrates a current-mode boost converter with dynamic headroom control (DHC) that automatically adjusts VOUT to match LED string voltage requirements-operating only for LED pulse widths >400 ns to ensure stable regulation. Its internal 2.0 A SMARTMOS FET, fixed 600 kHz switching frequency (per "C" variant), and external type-II compensation on COMP enable high-efficiency operation up to 90% at 33 V output.
It implements six independent current-sink channels with matched ILED tolerance (±2% typ.), programmable via ISET resistor (RSET = 153 / ILED), and supports dual control modes: standard EN/PWM and low-power single-wire WAKE+PWM mode with 27–33 ms shutdown timeout. Fault detection includes OVP (internally fixed 60 V typ., externally adjustable down to 15 V), SFDV (7.0 V typ. short-detect threshold), and OFDV (0.55 V open-detect threshold).
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 16-series LED strings at ~3.75 V per LED |
| LED Current Range | 3.0 mA to 30 mA per channel - set by 0.1% precision ISET resistor, enabling fine brightness control |
| Current Matching Tolerance | ±2% max across all six channels - ensures uniform luminance in multi-string backlight systems |
| Switching Frequency | 600 kHz (typ.) - enables compact magnetics (e.g., 22–33 µH inductor) and reduced EMI filtering burden |
| OVP Protection | Internally fixed 60 V (56–64 V) + externally programmable 15–60 V - dual-layer safeguard against boost overvoltage failure |
| Thermal Resistance | Junction-to-case 3.1 °C/W - EP pad enables efficient heat dissipation in space-constrained display modules |
Pinout & Package
MC34845BEPR2 is housed in a thermally enhanced 24-pin QFN-EP package (98ASA00602D), with exposed pad (EP) soldered to PCB ground for thermal management and low-inductance power return.
| 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 boost inductor and Schottky diode; support 2.0 A peak switch current |
| PGNDA / PGNDB | Power ground for boost FET | Separate low-impedance return path for high-current boost loop; minimizes noise coupling |
| CH1–CH6 | LED current sink outputs | Each drives one LED string up to 30 mA; channel disable thresholds: SFDV = 7.0 V, OFDV = 0.55 V |
| ISET | Current programming reference | Resistor-to-GND sets LED current (RSET = 153 / ILED); voltage regulated at 2.043 V (typ.) |
| PWM | Direct dimming control | Accepts 0–5.5 V logic; controls LED current linearly from 10% to 100% duty cycle at up to 100 kHz |
| EN | Enable control (active-high) | Internal pull-down; asserts low-power shutdown when held <0.5 V; restarts device on rising edge |
| WAKE | Single-wire standby entry | When tied to PWM and EN grounded, initiates 27–33 ms timeout into shutdown on sustained low PWM |
| FAIL | Open-drain fault indicator | Pulled low during normal operation; floats high-impedance on any fault (OVP, OTP, LED open/short, OCP) |
| OVP | External overvoltage setting | Resistor divider from VOUT to GND programs OVP threshold between 15 V and 60 V using 6.9 V internal reference |
| COMP | Boost compensation node | Accepts type-II network (e.g., 33 nF + 220 pF + 2 kΩ) to stabilize current-mode boost loop |
| VDC1 / VDC2 | Internal regulator decoupling | 2.5 V and 6.0 V rails for internal logic; require 2.2 µF ceramic caps each to prevent UVLO triggering |
| GND (pins 13,19,21) | Analog/digital reference | Signal ground for control circuitry; separate from PGNDA/B to avoid switching noise injection |
| VOUT | Boost output feedback | Monitors regulated output; used by DHC loop and OVP comparator; leakage <500 µA at 60 V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.0 A boost FET | Eliminates external MOSFET and gate driver, reducing BOM count and layout area in portable backlight designs |
| Dynamic Headroom Control (DHC) | Automatically adjusts VOUT to minimum required voltage per LED string, improving efficiency and thermal performance |
| Six-channel ±2% current matching | Ensures consistent brightness across display edges without per-channel calibration or trimming |
| Programmable OVP (15–60 V) | Allows safe operation with varying LED string counts while retaining internal 60 V fail-safe clamp |
| Single-wire WAKE+PWM control | Reduces system GPIO count by combining dimming and low-power entry into one signal line |
| Comprehensive fault protection | Detects and reports LED open/short, overtemperature (150 °C shutdown), overcurrent (>2.3 A), and input UVLO |
Applications
| PC Notebook Backlight | Industrial Display Module |
|---|---|
Use Scenario: Edge-lit 14" LCD panel powered from 12 V supply with six parallel LED strings. IC Role / Device Role / Timing Role: Six-channel constant-current LED driver with integrated boost converter and dynamic headroom control. Use Value: Delivers uniform brightness at 20 mA/channel with ±2% matching, extends battery life via 90% peak boost efficiency, and enables flicker-free PWM dimming down to 1% duty cycle. |
Use Scenario: Ruggedized 12.1" HMI display in factory automation equipment requiring reliable operation from 9–21 V input. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with OVP, OTP, and LED open/short detection for unattended operation. Use Value: FAIL pin signals microcontroller on fault condition; internal 60 V OVP clamp prevents damage during LED string disconnection; -40 to 85 °C rating ensures field reliability. |
| Netbook Display Power | Healthcare Device Screen |
Use Scenario: Ultra-thin 10.1" netbook with space-constrained PCB and 2-cell Li-ion battery (6–8.4 V). IC Role / Device Role / Timing Role: High-efficiency boost LED driver supporting single-wire WAKE mode for instant-on/resume-from-standby. Use Value: 27–33 ms WAKE timeout enables rapid display wake without dedicated enable line; QFN-EP package (4×4 mm) fits tight layouts. |
Use Scenario: Portable ultrasound or patient monitor with medical-grade display requiring low EMI and stable luminance. IC Role / Device Role / Timing Role: Low-noise, tightly regulated LED current source with minimal conducted emissions due to fixed 600 kHz frequency and internal FET. Use Value: 600 kHz switching avoids sensitive audio bands; ±2% channel matching prevents visual artifacts; failsafe OVP protects against LED failure-induced overvoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3367-AEC1 | 6-channel, 100 mA/channel, 40 V max output, 2.2 MHz switching, AEC-Q100 qualified | Targeted at automotive displays; higher current, higher frequency, wider temp range (-40 to 125 °C) | Select for automotive-grade reliability and higher LED current; not drop-in due to different pinout, higher VOUT limit, and AEC-Q100 compliance overhead |
| TPS61196 | 6-channel, 30 mA/channel, 38 V max output, 1.2 MHz switching, no integrated FET (external MOSFET required) | Requires external boost FET and gate driver; higher board area and component count | Select when higher switching frequency is needed for smaller inductors; avoid if minimizing BOM and layout complexity is critical |
Compared with MC34845BEPR2, MPQ3367-AEC1 offers automotive qualification and higher current but demands re-layout and qualification effort, while TPS61196 trades integration for flexibility in FET selection and frequency tuning-neither provides the same combination of integrated 2.0 A FET, 60 V OVP, and single-wire WAKE functionality in a 24-pin QFN.
Availability
MC34845BEPR2 is available at Aetrix Electronics and suitable for PC notebooks, industrial HMIs, and portable medical displays requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for production ramp and maintenance phases.
Supply support for MC34845BEPR2 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 specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with deep expertise in power management and analog mixed-signal ICs.
The MC34845BEPR2 belongs to NXP's SMARTMOS-based LED backlight driver family, engineered specifically for cost-sensitive, space-constrained mid-size LCD displays requiring high current accuracy, integrated power conversion, and robust fault handling.
FAQ
What is the maximum LED string voltage supported by the MC34845BEPR2?
The MC34845BEPR2 supports a maximum boost output voltage of 60 V (typical), with an internally fixed overvoltage protection (OVP) threshold of 56–64 V. When using external OVP programming via the OVP pin, the threshold can be set as low as 15 V. This allows safe operation with LED strings up to ~16 LEDs in series (assuming ~3.75 V per LED), provided the external OVP resistor divider is configured correctly to stay ≥5 V above the worst-case string voltage.
How does the Dynamic Headroom Control (DHC) function in the MC34845BEPR2?
The MC34845BEPR2 uses Dynamic Headroom Control to continuously monitor LED string voltage via the CHx pins and dynamically adjust the boost output (VOUT) to the minimum level required-reducing power loss and heat generation. DHC operates only when LED channel pulse widths exceed 400 ns; below that, regulation defaults to the programmed OVP level. This ensures optimal efficiency across varying brightness levels and LED forward voltage tolerances.
Can the MC34845BEPR2 drive more than six LED strings?
No, the MC34845BEPR2 has exactly six dedicated current-sink channels (CH1–CH6) and cannot drive additional strings. Each channel supports up to 30 mA, and all six must be used within the total power and thermal limits of the device. For more than six strings, multiple MC34845BEPR2 devices or a higher-channel-count driver (e.g., MC34846) would be required-though channel synchronization and inter-device communication are not supported natively.
What is the purpose of the WAKE pin on the MC34845BEPR2?
The WAKE pin on the MC34845BEPR2 enables single-wire standby control: when tied to the PWM pin and EN is held low, the device enters low-power shutdown mode if PWM remains low for longer than 27–33 ms. This eliminates the need for a separate enable signal in resource-constrained systems, simplifying firmware and reducing GPIO usage while maintaining full PWM dimming capability during active periods.
Does the MC34845BEPR2 require external compensation components?
Yes, the MC34845BEPR2 requires external compensation on the COMP pin to stabilize its current-mode boost converter. A type-II network-typically a series RC (e.g., 2 kΩ + 33 nF) with a shunt capacitor (e.g., 220 pF)-is mandatory. The datasheet specifies recommended values (CCOMP1 = 33 nF, CCOMP2 = 220 pF, RCOMP = 2.0 kΩ) and warns that omitting or misconfiguring this network causes instability, oscillation, or poor transient response in the boost output.
MC34845BEPR2 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:
- 2.6A (Switch)
- Frequency:
- 300kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN-EP (4x4)
MC34845BEPR2 FAQ
1.How can I place an order for MC34845BEPR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34845BEPR2 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 MC34845BEPR2 reliable?
The price and inventory of MC34845BEPR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34845BEPR2 is usually 5 days.
3.What payment methods are accepted for MC34845BEPR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34845BEPR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34845BEPR2?
MC34845BEPR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34845BEPR2 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 MC34845BEPR2?
For technical support, including MC34845BEPR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34845BEPR2 requirements.
6.How does Aetrix verify that MC34845BEPR2 is sourced from the original manufacturer or authorized distributors?
All MC34845BEPR2 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 MC34845BEPR2 meets industry standards.
7.What is the process for return or replacement of MC34845BEPR2?
All MC34845BEPR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34845BEPR2, 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 MC34845BEPR2 part is unused and in its original packaging.
Return procedure for MC34845BEPR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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