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Monolithic Power Systems Inc. MP3385BGR-Z
- Part No.:
- MP3385BGR-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MP3385BGR-Z.pdf
- Description:
- 4-STRING, 80V OUTPUT WLED CONTRO
- Quantity:
- Payment:
- Shipping:
Inventory:2,051
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Product details
Overview
MP3385BGR-Z from Monolithic Power Systems is a 4-string, 80V absolute maximum-rated WLED controller IC with I²C interface, peak-current-mode step-up architecture, and four regulated current sinks (up to 300mA/string). It operates from 4.5V–33V input, delivers 1.8% inter-string current matching, and supports analog/PWM/mixed dimming for LCD backlighting in mid-to-large panels.
For engineers reviewing the MP3385BGR-Z datasheet, MP3385BGR-Z pinout, MP3385BGR-Z application, or MP3385BGR-Z equivalent, key selection criteria include its 100–900kHz configurable switching frequency, 8-bit full-scale current setting (2–100%), 10-bit internal dimming resolution, OVP threshold programmability (18–74V), and auto-detection of unused LED strings at startup.
Technical Context
The MP3385BGR-Z implements a constant-frequency, peak-current-mode boost controller with an internal 6V LDO (VCC) powering gate drive and logic. Its regulation loop uses COMP-based error amplification and cycle-by-cycle IS-pin current sensing, with soft-start and unused-string auto-detection to prevent OVP-triggered startup failure.
Dimming control is fully configurable via I²C: MODE[1:0] selects PWM/analog/mixed mode; INTERFACE bit chooses external pulse or internal register control; transfer points (25%/50%) and internal 23kHz PWM frequency are fixed. Protection includes latch-off/recoverable OCP (0.15–0.5V), OVP (18–74V), OTP (150°C), LED open/short, and inductor/diode short detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 33V - supports wide-input industrial and display power rails without pre-regulation. |
| Max Output Voltage per String | 80V - enables driving long LED strings (e.g., 14× white LEDs @ 5.7V each) in large-panel LCDs. |
| Current Matching Accuracy | 1.8% - ensures uniform brightness across all 4 strings without external calibration. |
| Switching Frequency Range | 100kHz to 900kHz - allows optimization of inductor size, efficiency, and EMI in space-constrained designs. |
| Dimming Resolution | 10-bit internal (0.098% step) - provides smooth, flicker-free brightness control down to 0.1% intensity. |
| OVP Threshold Range | 18V to 74V (2V/step) - configurable to match specific LED string Vf and margin requirements. |
| OCP Threshold Range | 0.15V to 0.5V (50mV/step) - sets precise current-limit point for external sense resistor selection. |
Pinout & Package
MP3385BGR-Z is housed in a thermally enhanced QFN-20 (4mm × 4mm) package with exposed thermal pad tied to PGND. The 20-pin layout supports compact high-voltage LED driver PCB layouts with dedicated pins for gate drive (DRV), current sensing (IS), fault reporting (FT), and I²C communication (SCL/SDA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DRV | External MOSFET gate driver output | Drives N-channel boost switch; requires series gate resistor (e.g., 10Ω) for damping. |
| 2 VCC | Internal 6V LDO output | Powers internal logic and gate driver; bypass with ceramic capacitor to AGND. |
| 3 EN | Enable control input | Active-high logic: >1.5V enables, <0.6V disables; must not be left floating. |
| 4 VIN | Main input supply | 4.5–33V input; requires local ceramic bypass capacitor to PGND. |
| 5 PWM | External dimming pulse input | Accepts 0.4–1.5V logic thresholds; used for analog/mixed dimming when filtered via LPF pin. |
| 6 SCL | I²C clock input | 400kHz max clock; requires pull-up to VCC (typically 4.7kΩ). |
| 7 SDA | I²C data bidirectional line | Open-drain; requires same pull-up as SCL; supports standard I²C read/write sequences. |
| 8 FT | Fault flag open-drain output | Pulled low during OVP/OCP/OTP/LED fault; requires external 100kΩ pull-up to VCC. |
| 9 LPF | Analog dimming filter node | Connects to external capacitor for PWM-to-DC conversion in analog/mixed dimming modes. |
| 10 OSC | Switching frequency programming | Resistor-to-ground (e.g., 100kΩ) sets base fSW; fine-tuned via I²C register FS[3:0]. |
| 11 COMP | Error amplifier compensation | Connect RC network to ground for loop stability; critical for transient response and noise immunity. |
| 12 ISET | LED current reference input | 1.98V reference; connects to current-setting resistor to ground for precise full-scale ILED. |
| 13–16 LED1–LED4 | String current sink outputs | Open-drain NMOS outputs; connect directly to LED string cathodes for independent current regulation. |
| 17–18 OVP, IS | Output overvoltage sense / Inductor current sense | OVP monitors boost output; IS senses RSENSE voltage for cycle-by-cycle current limiting. |
| 19 PGND | Power ground | High-current return path for boost inductor, MOSFET source, and LED strings. |
| 20 AGND | Analog ground | Reference for sensitive analog blocks (COMP, ISET, VCC regulator); separate from PGND. |
Key Features
| Feature | Design Value |
|---|---|
| 4-channel independent current regulation | Each LED string driven by dedicated open-drain sink (LED1–LED4), enabling asymmetric string configurations and fault isolation. |
| Unused string auto-detection at startup | Prevents OVP trip during initialization by disabling unconnected strings before boost begins - simplifies board bring-up and debug. |
| Cascading capability with single power source | Multiple MP3385BGR-Z ICs can share one VIN rail and synchronize via IS pin connection, scaling to >4 strings without extra controllers. |
| Recoverable thermal shutdown | Shuts down at 150°C junction temperature and resumes operation after die cools by ≥25°C - avoids permanent latch-off in transient overload. |
| Configurable protection thresholds | OVP (18–74V), OCP (0.15–0.5V), and LED short threshold (4–11V) set via I²C registers - eliminates hardware changes for design variants. |
Applications
| Desktop LCD Flat-Panel Displays | All-in-One PCs |
|---|---|
Use Scenario: Backlighting for 24–32 inch IPS LCD panels with 4 parallel WLED strings. IC Role / Device Role / Timing Role: Primary WLED current controller managing boost converter, string current regulation, and I²C-configured dimming. Use Value: 1.8% current matching ensures uniform luminance across panel; 80V string rating supports 12–14 LED per string at 5.7V typical Vf. | Use Scenario: Integrated display backlight in space-constrained AIO chassis with shared 12V rail. IC Role / Device Role / Timing Role: High-efficiency step-up LED driver with cascading support for multi-zone dimming expansion. Use Value: Cascading capability allows dual MP3385BGR-Z chips to drive 8 strings from one 12V input, reducing BOM count vs. discrete solutions. |
| 2D LCD TVs | 3D LCD TVs |
Use Scenario: Edge-lit backlight for 43–55 inch consumer TVs requiring flicker-free dimming. IC Role / Device Role / Timing Role: I²C-controlled WLED driver supporting 23kHz internal PWM dimming to eliminate visible flicker. Use Value: Fixed 23kHz internal PWM frequency meets TV industry flicker standards without external clock generation. | Use Scenario: Local dimming zones in active-shutter 3D TVs needing rapid, synchronized brightness transitions. IC Role / Device Role / Timing Role: Mixed dimming controller using 25% transfer point to combine analog precision at high brightness with PWM resolution at low levels. Use Value: Mixed dimming mode enables seamless 0–100% intensity control with <0.1% steps below 25%, critical for 3D depth perception. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3385-AEC1GR-Z | Automotive-grade variant with AEC-Q100 qualification, extended -40°C to +125°C operating range, and enhanced ESD (±3kV HBM). | Required for automotive infotainment displays; not suitable for commercial desktop/AIO where cost sensitivity dominates. | Select only if automotive qualification and higher temperature margin are mandatory. |
| RT8581GSP | 4-string WLED controller with similar 80V rating but no I²C interface; uses analog trim resistors and fixed 200kHz fSW. | Lacks digital configurability - dimming, OVP, and OCP require hardware changes; no unused-string auto-detect. | Choose for ultra-low-cost, fixed-function designs where I²C flexibility and startup robustness are unnecessary. |
Compared with MP3385BGR-Z, the MPQ3385-AEC1GR-Z adds automotive reliability at higher cost and power dissipation, while the RT8581GSP sacrifices configurability and diagnostic features for simplicity and lower BOM count - making MP3385BGR-Z optimal for mid-tier commercial displays requiring field-programmable dimming and protection.
Availability
MP3385BGR-Z is available at Aetrix Electronics and suitable for desktop LCD flat-panel displays, all-in-one PCs, and 2D/3D LCD TVs requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MP3385BGR-Z 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, including DC/DC converters, LED drivers, motor drivers, and battery management solutions.
The MP3385B product line targets mid-to-large LCD backlighting applications, delivering high-efficiency, digitally configurable WLED control with integrated protection and thermal resilience for commercial and industrial displays.
FAQ
What is the minimum recommended inductor value for MP3385BGR-Z?
The datasheet specifies a typical 33μH inductor with 64mΩ DCR for 4-string operation at 120mA/string. Minimum inductance depends on input voltage, output voltage, and switching frequency; for 100kHz fSW and VIN=12V, 22μH is viable, but ripple current increases. Always verify peak inductor current stays below saturation and RMS current ratings.
Can MP3385BGR-Z drive more than four LED strings?
Yes - via cascading. Connect the IS pin of a slave MP3385BGR-Z to ground and synchronize with the master's IS signal. Up to three devices can be cascaded to drive 12 strings from one VIN rail, maintaining independent current regulation per string and coordinated fault handling.
How does unused string auto-detection work during startup?
At power-on, the IC monitors OVP pin voltage and individual LEDx pin voltages before enabling the boost converter. If any LEDx pin remains near ground (indicating open/unconnected string), that channel is disabled preemptively - preventing VOUT from rising to OVP threshold and avoiding false fault lockout.
What is the purpose of the LPF pin, and when is it required?
The LPF pin outputs a filtered DC voltage derived from the PWM input signal. It is required only in external analog or mixed dimming modes to convert the PWM pulse into a proportional analog control voltage. In direct PWM dimming mode, LPF must be left unconnected to avoid interference with fast-switching LED current.
Is MP3385BGR-Z RoHS and REACH compliant?
Yes - MP3385BGR-Z is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. MPS confirms green status on its official Quality Assurance page, with material declarations available upon request.
What happens when the FT pin goes low?
A low FT pin indicates an active fault condition - such as OVP, OCP, OTP, LED open/short, or inductor/diode short. The corresponding fault bit is set in register 03h. To clear the fault, either cycle VIN/EN power or write '0' to the fault bit via I²C after correcting the root cause.
Does MP3385BGR-Z support daisy-chained I²C configuration?
No - MP3385BGR-Z has a fixed 7-bit I²C address (0x38) with no address-select pins. Multiple units on one bus require individual addressing via GPIO-controlled enable lines or multiplexing, as true daisy-chaining is not supported by the protocol or hardware design.
MP3385BGR-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 33V
- Voltage - Output:
- 80V
- Current - Output / Channel:
- 300mA
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-QFN (4x4)
MP3385BGR-Z FAQ
1.How can I place an order for MP3385BGR-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3385BGR-Z 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 MP3385BGR-Z reliable?
The price and inventory of MP3385BGR-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3385BGR-Z is usually 5 days.
3.What payment methods are accepted for MP3385BGR-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3385BGR-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3385BGR-Z?
MP3385BGR-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3385BGR-Z 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 MP3385BGR-Z?
For technical support, including MP3385BGR-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3385BGR-Z requirements.
6.How does Aetrix verify that MP3385BGR-Z is sourced from the original manufacturer or authorized distributors?
All MP3385BGR-Z 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 MP3385BGR-Z meets industry standards.
7.What is the process for return or replacement of MP3385BGR-Z?
All MP3385BGR-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3385BGR-Z, 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 MP3385BGR-Z part is unused and in its original packaging.
Return procedure for MP3385BGR-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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