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NXP Semiconductors MC34845DEPR2
- Part No.:
- MC34845DEPR2
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
MC34845DEPR2.pdf
- Description:
- IC LED DRVR RGLTR PWM 2.6A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
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Product details
Overview
MC34845DEPR2 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 300 kHz fixed switching frequency. It is used in notebook and portable display power management.
For engineers reviewing the MC34845DEPR2 datasheet, MC34845DEPR2 pinout, MC34845DEPR2 application, or MC34845DEPR2 equivalent, key selection considerations include its integrated boost converter with dynamic headroom control, programmable OVP via external resistor divider, six independent current-sink channels, fault protection (LED open/short, overtemperature, overcurrent), and QFN-EP 24-pin thermal-enhanced package.
Technical Context
The MC34845DEPR2 implements a current-mode boost converter with Dynamic Headroom Control (DHC) that automatically adjusts VOUT to match LED string voltage requirements while minimizing power loss. Its internal 2.0 A SMARTMOS FET, 300 kHz switching frequency, and external Type II compensation on COMP pin enable stable high-efficiency operation across varying LED loads.
Each of the six CHx pins functions as a precision current sink with matched tolerance ≤±2%, set by a single ISET-to-GND resistor. Fault detection includes LED open (OFDV = 0.55 V), short (SFDV = 7.0 V typ), overvoltage (internally fixed 60 V OVP + externally programmable down to 15 V), and overtemperature shutdown at 150 °C with 25 °C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.0 V to 21 V - supports 2–3 cell Li-ion batteries or 12 V rail without external regulators. |
| Boost Output Voltage | Up to 60 V - sufficient for driving up to 16-series LEDs at typical forward voltages. |
| Boost Switch Current Limit | 2.1 A (min) to 2.6 A (max) - ensures robust operation under transient load and startup conditions. |
| Switching Frequency | 300 kHz (typ) - balances EMI, efficiency, and external component size for portable applications. |
| LED Current Range | 3.0 mA to 30 mA per channel - set precisely via ISET resistor (RSET = 153 / ILED), enabling flexible brightness tuning. |
| Channel Matching Tolerance | ±2% max (10–30 mA range) - guarantees uniform luminance across multi-string LCD backlight panels. |
| OVP Threshold | Internally fixed 60 V (typ), externally programmable from 15 V to 60 V - dual-layer protection against boost overvoltage failure modes. |
Pinout & Package
MC34845DEPR2 is housed in a thermally enhanced 24-pin QFN-EP package (JEDEC MO-220, outline 98ASA00602D) with exposed pad (EP) for PCB-level heat dissipation. Thermal resistance is 3.1 °C/W junction-to-case and 36 °C/W junction-to-ambient (multilayer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 5.0–21 V; powers internal LDOs and boost controller; triggers UVLO at 4.0–4.4 V. |
| SWA / SWB | Boost switch nodes | Connect to external boost inductor and Schottky diode; support 2.0 A peak current switching. |
| CH1–CH6 | LED current sinks | Each drives one LED string up to 30 mA; matched within ±2%; off-state leakage <1.0 μA at 45 V. |
| ISET | Current reference input | Resistor to GND sets LED current (RSET = 153 / ILED); voltage regulated at ~2.04 V. |
| PWM | Digital dimming control | Direct PWM input (0–100% duty, DC–100 kHz); modulates LED current without analog scaling. |
| EN | Enable control | Active-high logic input; pulls down internally; places device in <2.0 μA shutdown when low. |
| WAKE | Single-wire standby control | Enables low-power mode when tied to PWM and EN grounded; timeout = 27–33 ms. |
| OVP | External overvoltage sense | Resistor divider from VOUT to GND sets OVP threshold; internal reference = 6.9 V (typ). |
| FAIL | Open-drain fault indicator | Low-impedance when healthy; high-Z during LED open/short, overtemp, or overcurrent events. |
| COMP | Boost loop compensation | Accepts Type II network (e.g., 2 kΩ + 33 nF + 220 pF) to stabilize current-mode boost dynamics. |
| GND / PGNDA / PGNDB / EP | Ground terminals | Separate signal (GND), boost power (PGNDA/PGNDB), and thermal pad (EP) grounds minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.0 A boost FET | Eliminates external MOSFET and reduces BOM count, PCB area, and layout complexity in portable backlight designs. |
| Dynamic Headroom Control (DHC) | Automatically adjusts VOUT to minimum required voltage per LED string, improving system efficiency by >5% vs fixed-output boost. |
| Six independent current-sink channels | Enables uniform edge-lit backlighting for 10–17″ LCDs without external current mirrors or matching resistors. |
| Programmable OVP with internal backup | External resistor divider sets precise OVP level (15–60 V); internal 60 V fallback prevents catastrophic failure if divider opens. |
| Fault protection suite | Detects and reports LED open (via OFDV), short (via SFDV), overtemperature (150 °C shutdown), overcurrent (10 ms timeout), and UVLO. |
Applications
| PC Notebook Backlight | Industrial Display Backlight |
|---|---|
Use Scenario: Driving 6 parallel LED strings behind a 14″ edge-lit LCD panel in a battery-powered laptop. IC Role / Device Role / Timing Role: MC34845DEPR2 acts as the primary LED current controller and boost power supply, synchronizing PWM dimming with system GPU timing signals. Use Value: Achieves >90% peak boost efficiency at 12 V input, extends battery life, and maintains ±2% luminance uniformity across the display surface. | Use Scenario: Powering segmented backlight zones in a ruggedized medical monitor requiring long-term reliability and fault logging. IC Role / Device Role / Timing Role: MC34845DEPR2 serves as the fault-aware LED driver, using FAIL pin assertion to trigger system-level diagnostics and safe shutdown. Use Value: Built-in LED open/short detection and overtemperature shutdown prevent localized thermal runaway and support IEC 60601 compliance. |
| Portable DVD Player Display | GPS Navigation Screen |
Use Scenario: Compact backlight solution for a 7″ portable DVD player with variable ambient light sensing and auto-brightness control. IC Role / Device Role / Timing Role: MC34845DEPR2 receives analog-dimmed PWM from microcontroller and regulates six LED strings independently for smooth brightness transitions. Use Value: 3.0–30 mA programmable current range enables precise 100:1 dimming ratio without color shift, critical for video playback fidelity. | Use Scenario: Sunlight-readable GPS unit with wide input voltage range (9–18 V automotive supply) and thermal stress in vehicle cabin environments. IC Role / Device Role / Timing Role: MC34845DEPR2 functions as the thermally robust LED driver, leveraging its 85 °C operating range and 150 °C overtemperature cutoff. Use Value: Integrated thermal protection and 36 °C/W θJA allow continuous operation in sealed enclosures without forced airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34845CEPR2 | 600 kHz boost frequency; higher boost current limit (1.9–2.3 A); no slope compensation (VSLOPE = 0.52 V/μs not applicable) | Better suited for compact layouts requiring smaller inductors; less tolerant of high-ESR output capacitors due to higher fSW | Select MC34845CEPR2 when board space is constrained and higher switching frequency improves EMI filtering. |
| TPS61165DRVR | Single-channel, 40 V max output, 1.2 A boost FET; no integrated multi-string current matching; requires external current-setting per channel | Requires additional ICs or discrete circuitry to replicate six-channel matching; lacks DHC and FAIL pin reporting | Choose TPS61165DRVR only for cost-sensitive single-string designs where channel matching is handled externally. |
Compared with MC34845CEPR2 and TPS61165DRVR, the MC34845DEPR2 offers optimal balance of integration (6-channel matching + boost), thermal robustness (3.1 °C/W θJC), and application-specific features (DHC, single-wire WAKE, programmable OVP) for mid-size LCD backlight systems.
Availability
MC34845DEPR2 is available at Aetrix Electronics and suitable for PC notebook backlighting, industrial display illumination, portable media player lighting, and automotive infotainment screen applications requiring stable component supply and long lifecycle support.
Supply support for MC34845DEPR2 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 core expertise in power management and mixed-signal IC design.
The MC34845DEPR2 belongs to NXP's SMARTMOS LED backlight driver family, engineered specifically for energy-efficient, fault-resilient edge-lit LCD backlighting in portable and industrial displays from 10″ to 17″.
FAQ
What is the maximum LED string voltage supported by the MC34845DEPR2?
The MC34845DEPR2 supports a maximum boost output voltage of 60 V, which corresponds to the internally fixed overvoltage protection (OVP) threshold. When using external OVP programming, the upper limit remains 60 V, while the lower bound is 15 V. This allows driving up to 16 series-connected white LEDs (assuming ~3.5 V VF each) while maintaining margin for dynamic headroom control. The actual usable string voltage depends on the external OVP resistor divider setting and must stay ≥5 V below the configured OVP level.
How does the Dynamic Headroom Control (DHC) function in the MC34845DEPR2?
The Dynamic Headroom Control in the MC34845DEPR2 continuously monitors LED string voltage via the VOUT feedback path and dynamically adjusts the boost converter output to the minimum level required to maintain regulation across all six channels. It operates only for LED pulse widths >400 ns; below this, the DHC is inactive and VOUT defaults to the OVP-set level. This real-time adjustment reduces power dissipation in the LED current sinks and improves overall system efficiency-especially critical in battery-powered devices like notebooks and portable DVD players-without compromising current accuracy or channel matching.
Can the MC34845DEPR2 drive more than six LED strings?
No, the MC34845DEPR2 is strictly a six-channel LED driver with dedicated CH1–CH6 pins. Each channel is a matched current sink capable of up to 30 mA, and the internal current mirror architecture ensures ≤±2% matching only among these six outputs. To drive more than six strings, multiple MC34845DEPR2 devices must be synchronized using shared PWM and EN signals, or a higher-channel-count driver such as the MC34846 (12-channel variant) should be selected. Attempting to parallel channels or reassign pins violates the internal design and voids performance guarantees.
What is the purpose of the WAKE pin on the MC34845DEPR2?
The WAKE pin on the MC34845DEPR2 enables single-wire standby control: when WAKE and PWM are tied together and EN is held low, the device enters ultra-low-power shutdown mode whenever the PWM signal remains low for longer than 27–33 ms. This eliminates the need for a separate enable signal in space-constrained designs. Upon detecting a high-going edge on PWM after timeout, the device wakes and resumes LED driving. This feature reduces system-level pin count and simplifies firmware control in portable displays where rapid, low-overhead brightness cycling is required.
Does the MC34845DEPR2 require external compensation components?
Yes, the MC34845DEPR2 requires external compensation on the COMP pin to stabilize its current-mode boost converter loop. A Type II network-typically a series RC (e.g., 2.0 kΩ + 33 nF) with a shunt capacitor (e.g., 220 pF)-must be connected from COMP to GND. The datasheet specifies recommended values based on switching frequency: for the 300 kHz version (MC34845DEPR2), CCOMP1 = 56 nF and CCOMP2 = 220 pF are advised. Omitting or incorrectly sizing these components risks instability, excessive output ripple, or failure to regulate under load transients.
MC34845DEPR2 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)
MC34845DEPR2 FAQ
1.How can I place an order for MC34845DEPR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34845DEPR2 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 MC34845DEPR2 reliable?
The price and inventory of MC34845DEPR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34845DEPR2 is usually 5 days.
3.What payment methods are accepted for MC34845DEPR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34845DEPR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34845DEPR2?
MC34845DEPR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34845DEPR2 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 MC34845DEPR2?
For technical support, including MC34845DEPR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34845DEPR2 requirements.
6.How does Aetrix verify that MC34845DEPR2 is sourced from the original manufacturer or authorized distributors?
All MC34845DEPR2 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 MC34845DEPR2 meets industry standards.
7.What is the process for return or replacement of MC34845DEPR2?
All MC34845DEPR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34845DEPR2, 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 MC34845DEPR2 part is unused and in its original packaging.
Return procedure for MC34845DEPR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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