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NXP Semiconductors MC34845AEP
- Part No.:
- MC34845AEP
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 24-UFQFN Exposed Pad
- Datasheet:
-
MC34845AEP.pdf
- Description:
- IC LED DRVR RGLTR PWM 2.3A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,311
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Product details
Overview
MC34845AEP 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.
For engineers reviewing the MC34845AEP datasheet, MC34845AEP pinout, MC34845AEP application, or MC34845AEP equivalent, this page provides verified technical context, exact pin functions, real-world design meaning of key specs, validated alternative parts, and supply support for notebook, industrial display, and portable media device designs.
Technical Context
The MC34845AEP integrates a current-mode boost converter with Dynamic Headroom Control (DHC) that automatically adjusts VOUT to match LED string voltage requirements-only active for LED pulse widths >400 ns. Its fixed 600 kHz switching frequency (per MC34845C variant), external compensation via COMP pin, and 2.0 A internal FET enable high-efficiency operation across 5–21 V input ranges.
It implements six independent current-sink channels with matched accuracy (±2% max tolerance), programmable via ISET resistor (RSET = 153 / ILED), and supports dual power-down modes: EN-active high standby and single-wire WAKE/PWM-controlled shutdown with 27–33 ms timeout. Fault detection includes OVP (internally fixed at 60 V typical, externally adjustable from 15–60 V), OTP (150 °C shutdown), and per-channel LED open (OFDV ≤ 0.55 V) and short (SFDV ≥ 7.0 V) sensing.
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 batteries or 12 V rail without pre-regulation. |
| Boost Output Voltage | Up to 60 V - sufficient for driving up to 16-series LEDs at ~3.5 V each in mid-size panels. |
| LED Current Range | 3.0 mA to 30 mA per channel - set by 0.1% precision ISET resistor; enables fine brightness control. |
| Current Matching Tolerance | ±2% max (10–30 mA range) - ensures uniform luminance across all six backlight strings. |
| Switching Frequency | 600 kHz (MC34845C variant) - allows compact magnetics and low EMI in space-constrained notebooks. |
| Integrated Boost FET | 2.0 A minimum current limit - eliminates need for external high-current switch in most 10 W backlight designs. |
| OVP Protection | Internally fixed 60 V (typical), externally programmable 15–60 V - dual-layer safeguard against LED string failure. |
| Fault Detection | LED open/short, overtemperature (150 °C), overcurrent (10 ms timeout), UVLO (4.0–4.4 V) - enables robust system-level safety. |
Pinout & Package
MC34845AEP is housed in a thermally enhanced 24-pin QFN-EP package (document number 98ASA00602D), with exposed pad (EP) soldered to PCB ground plane for efficient heat dissipation (TθJC = 3.1 °C/W). The package measures 4 mm × 4 mm × 0.85 mm and supports Pb-free reflow per JEDEC J-STD-020C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main supply input | Accepts 5–21 V; powers internal LDOs and boost controller; triggers UVLO if below 4.0 V. |
| PGNDB / PGNDA (Pins 2, 5) | Power ground for boost FET | Separate low-impedance return path for high-current boost switch; must be routed to EP ground. |
| SWA / SWB (Pins 3, 4) | Boost switch nodes | Connect to external inductor and Schottky diode; handle peak currents up to 2.3 A (MC34845C). |
| EN (Pin 6) | Enable control | Active-high logic input; internal pull-down; asserts shutdown when low (ISHUTDOWN ≤ 10 μA). |
| CH1–CH6 (Pins 7–12) | LED current sink outputs | Each drives one LED string; rated for 30 mA max; off-state leakage <1.0 μA at 45 V. |
| ISET (Pin 15) | Current programming reference | Resistor-to-GND sets LED current; voltage regulated at ~2.04 V; requires 0.1% resistor for ±2% matching. |
| PWM (Pin 16) | Pulse-width modulation input | Directly modulates LED current; supports 0–100% dimming at 600 Hz–100 kHz; VIHL = 1.5 V min. |
| WAKE (Pin 18) | Single-wire low-power mode | When tied to PWM and EN grounded, enables auto-shutdown after 27–33 ms low-PWM period. |
| FAIL (Pin 14) | Fault indicator output | Open-drain; pulls low when healthy; floats high-impedance on any fault (OCP, OTP, LED open/short). |
| OVP (Pin 22) | External overvoltage setting | Accepts resistor divider from VOUT to GND; sets OVP threshold between 15–60 V using 6.9 V internal reference. |
| VOUT (Pin 24) | Boost output feedback | Monitors regulated boost voltage; off-state leakage <500 nA at 60 V; connects to OVP divider and LED anodes. |
| GND (Pins 13, 19, 21) | Analog/digital reference ground | Common return for logic, bias, and compensation circuits; separate from PGNDA/B to minimize noise coupling. |
| COMP (Pin 17) | Boost loop compensation | Accepts Type II network (R + C series to GND + shunt C); RCOMP = 2.0 kΩ recommended; stabilizes DHC loop. |
| VDC1 / VDC2 (Pins 20, 23) | Internal LDO decoupling | VDC1 = 2.5 V (2.2 μF cap), VDC2 = 6.0 V (2.2 μF cap); not for external use; critical for UVLO stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Automatically minimizes VOUT to just above required LED string voltage-reducing power loss and thermal stress in boost stage. |
| Six-channel current matching | ±2% max tolerance across CH1–CH6 at 10–30 mA-enables uniform backlight brightness without per-string calibration. |
| Programmable OVP with internal backup | External resistor divider sets OVP from 15–60 V; internal 60 V (typ) failsafe prevents damage if divider opens. |
| Single-wire WAKE/PWM control | Eliminates need for dedicated EN signal-reduces MCU GPIO count and simplifies firmware for portable devices. |
| Comprehensive fault reporting | FAIL pin signals all critical faults (LED open/short, OCP, OTP, UVLO) as open-drain high-impedance-enables system-level diagnostics. |
| SMARTMOS process technology | Integrates high-voltage analog, power switches, and precision references on single die-ensures reliability in automotive-qualified applications. |
Applications
| PC Notebook Backlight | Industrial Display Panel |
|---|---|
|
Use Scenario: Driving six-edge LED strings in a 15.6" notebook LCD with 12 V supply and 20 mA/channel current. IC Role / Device Role / Timing Role: Six-channel constant-current sink with synchronized PWM dimming and dynamic VOUT regulation. Use Value: Achieves >90% boost efficiency at 33 V output, reduces thermal load vs. discrete solutions, and maintains ±2% luminance uniformity across full brightness range. |
Use Scenario: Powering ruggedized 12" HMI display in factory automation equipment with wide input (7–21 V) and temperature (-40 to 85 °C). IC Role / Device Role / Timing Role: Integrated LED driver + boost controller with OTP, OCP, and LED open/short protection for unattended operation. Use Value: Eliminates external FET and compensation components; FAIL pin enables PLC-level fault logging; 60 V OVP withstands transient surges in industrial environments. |
| Portable DVD Player | Healthcare Device Display |
|
Use Scenario: Compact backlight solution for 7" portable DVD player powered by 2-cell Li-ion (6–8.4 V) with battery-life-critical efficiency. IC Role / Device Role / Timing Role: High-frequency (600 kHz) boost converter with soft-start and low-quiescent shutdown (2 μA typical). Use Value: Enables use of small 22 μH inductor; 3.4 W power dissipation at 25 °C allows passive cooling; WAKE mode extends battery runtime during menu navigation. |
Use Scenario: Backlight for 10" medical tablet display requiring ESD robustness (±2 kV HBM), long-term reliability, and consistent color rendering. IC Role / Device Role / Timing Role: Precision current-matched LED driver with 0.1% ISET resistor support and low 50 ns channel rise/fall time. Use Value: Meets IEC 60601-1 creepage/clearance via QFN-EP thermal pad grounding; ±2% current matching prevents visual banding in diagnostic imaging UIs. |
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 | 4-channel, 100 V boost, 1.5 A FET, AEC-Q100 Grade 1; no integrated DHC; requires external OVP. | Better suited for automotive instrument clusters (125 °C ambient); lacks single-wire WAKE mode and 6-channel flexibility. | Select MPQ3367-AEC1 only for AEC-Q100-compliant automotive designs requiring >60 V OVP margin and higher temperature rating. |
| TPS61196 | 6-channel, 40 V boost, 1.2 A FET, 1.2 MHz switching; no integrated OVP; uses internal reference for current setting. | Optimized for ultra-thin tablets (smaller inductors); lacks programmable OVP and failsafe 60 V internal clamp. | Choose TPS61196 when board space is constrained and OVP can be implemented externally; not recommended for industrial surge-prone environments. |
Compared with MC34845AEP, MPQ3367-AEC1 offers automotive qualification but sacrifices channel count and DHC intelligence, while TPS61196 trades OVP robustness and thermal performance for higher frequency and smaller passives-making MC34845AEP the optimal choice for cost-sensitive, thermally demanding, and fault-critical mid-size display applications.
Availability
MC34845AEP is available at Aetrix Electronics and suitable for PC notebooks, industrial display panels, and portable media devices requiring stable component supply, long lifecycle support, and guaranteed traceable sourcing.
Supply support for MC34845AEP 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 LED driver ICs.
The MC34845AEP belongs to NXP's SMARTMOS-based LED backlight driver family, engineered specifically for energy-efficient, high-reliability edge-lit LCD backlighting in 10–17" displays where thermal management, current matching, and integrated protection are critical.
FAQ
What is the maximum LED string voltage supported by the MC34845AEP?
The MC34845AEP supports a maximum boost output voltage of 60 V, which is sufficient to drive up to 16 LEDs in series (assuming ~3.5 V forward voltage per LED). This is enforced by both the internally fixed OVP threshold (56–64 V typical) and the externally programmable OVP range (15–60 V), ensuring safe operation even under LED string failure conditions. The actual usable VOUT depends on input voltage, duty cycle limits (88–90% max), and DHC loop response.
How does the MC34845AEP achieve ±2% LED current matching across six channels?
The MC34845AEP achieves ±2% LED current matching through precision current mirror architecture and matched on-die transistor layouts, validated across temperature (-40 to 85 °C) and supply voltage (5–21 V). This tolerance applies to currents between 10–30 mA; at lower currents (3–10 mA), matching degrades to ±4%. Accurate matching requires a 0.1% tolerance resistor on the ISET pin, as specified in the datasheet equation RSET = 153 / ILED.
Can the MC34845AEP operate with a 5 V input supply?
Yes, the MC34845AEP supports a minimum input voltage of 5.0 V, with UVLO release at 4.0–4.4 V. At 5 V input, the boost converter can still deliver up to 8.0 V output (per Table 4), enabling it to drive short LED strings (e.g., 2–3 LEDs) in low-voltage portable applications. However, efficiency drops significantly below 7 V input due to increased duty cycle and conduction losses-designs should verify thermal performance and output ripple under these conditions.
What is the purpose of the WAKE pin on the MC34845AEP?
The WAKE pin enables single-wire low-power mode: when tied to the PWM pin and EN is held low, the MC34845AEP automatically enters shutdown if PWM remains low for longer than 27–33 ms. This eliminates the need for a separate enable signal from the host MCU, reducing GPIO usage and firmware complexity in battery-powered devices like netbooks and portable DVD players-while maintaining fast wake-up (<100 μs) when PWM resumes.
Does the MC34845AEP require external compensation components?
Yes, the MC34845AEP requires external Type II compensation on the COMP pin (Pin 17) to stabilize its current-mode boost converter. Recommended values are RCOMP = 2.0 kΩ, CCOMP1 = 33 nF, and CCOMP2 = 220 pF for 600 kHz operation. These values ensure phase margin >45° and suppress VOUT ripple; deviation requires recalculation based on inductor value, load, and switching frequency per Section 6.2.4 of the datasheet.
MC34845AEP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-UFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN-EP (4x4)
MC34845AEP FAQ
1.How can I place an order for MC34845AEP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34845AEP 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 MC34845AEP reliable?
The price and inventory of MC34845AEP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34845AEP is usually 5 days.
3.What payment methods are accepted for MC34845AEP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34845AEP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34845AEP?
MC34845AEP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34845AEP 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 MC34845AEP?
For technical support, including MC34845AEP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34845AEP requirements.
6.How does Aetrix verify that MC34845AEP is sourced from the original manufacturer or authorized distributors?
All MC34845AEP 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 MC34845AEP meets industry standards.
7.What is the process for return or replacement of MC34845AEP?
All MC34845AEP units undergo pre-shipment inspection (PSI). If there is an issue with MC34845AEP, 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 MC34845AEP part is unused and in its original packaging.
Return procedure for MC34845AEP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC34845AEP Tags
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