My Inquiry
My Account
Monolithic Power Systems Inc. MP3312LGC-Z
- Part No.:
- MP3312LGC-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
MP3312LGC-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,140
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP3312LGC-Z from Monolithic Power Systems is a dual-channel, fixed-frequency boost white LED driver IC with integrated 40V N-channel MOSFET, designed for portable LCD backlighting. It operates from 2.7V–5.5V input, delivers up to 30mA per channel with ±2% current accuracy and 1% inter-channel matching, and features 38V overvoltage protection (OVP) - enabling reliable driving of 6-series white LEDs from a single-cell Li-ion battery.
For engineers reviewing the MP3312LGC-Z datasheet, MP3312LGC-Z pinout, MP3312LGC-Z application, or MP3312LGC-Z equivalent, key selection criteria include its 600kHz switching frequency, dual independent current sinks with 1-wire digital dimming (9-bit resolution), PWM analog dimming support (5–100kHz), internal soft-start, and WLCSP1.35×1.35-9mm package for ultra-compact mobile designs.
Technical Context
The MP3312LGC-Z employs peak-current-mode control with a fixed 600kHz oscillator and internal ramp compensation to ensure stable operation above 50% duty cycle. Its dual regulated current sinks independently drive two LED strings while automatically selecting the highest required output voltage via feedback monitoring of LED1/LED2 pins.
Dimming is implemented through two parallel paths: a PWM input (B1) enabling analog current scaling with internal filtering, and a multipurpose EN pin (C1) supporting 1-wire digital protocol (24-bit command, 9-bit dimming data, 0x8F device address) with ACK feedback capability and 1.39–50 kbit/s bit rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V–5.5V - supports direct connection to single-cell Li-ion (3.0–4.2V) with 2.4V UVLO threshold and 200mV hysteresis. |
| Switching Frequency | 600kHz (±20%) - enables compact external components (e.g., 4.7–10µH inductor, 1–4.7µF ceramic caps) and reduces EMI fundamental energy. |
| Max Output Current/Channel | 30mA - set by external ISET resistor; full-scale current defined by VISET = 1.232V and KISET = 1020 multiplier. |
| Current Accuracy & Matching | ±2% absolute accuracy and ≤1% inter-channel matching - ensures uniform brightness across dual displays or stacked LED arrays. |
| OVP Threshold | 38V (37–39.5V range) - protects against open-string fault-induced overvoltage; complements 40V MOSFET rating. |
| Digital Dimming Resolution | 9-bit (511 steps) via 1-wire interface - provides fine-grained brightness control without requiring additional MCU GPIOs or PWM peripherals. |
| Thermal Protection | 150°C shutdown with 25°C hysteresis - prevents permanent damage during sustained high-power operation in confined PCB layouts. |
Pinout & Package
MP3312LGC-Z is housed in a 1.35mm × 1.35mm, 9-ball WLCSP (Wafer-Level Chip Scale Package) with 0.4mm pitch, optimized for space-constrained mobile applications. The package uses face-down die attach and solder bumps for minimal footprint and thermal resistance (θJA = 120°C/W on 4-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (ISET) | Current reference input | Connects to external resistor to ground; sets full-scale LED current (e.g., 63.4kΩ → 20mA); must not be left floating. |
| A2 (LED2), A3 (LED1) | Dual current sink outputs | Low-side current sinks for independent LED string control; internally matched; unused channel must be tied to GND. |
| B1 (PWM) | Analog dimming control | Accepts 5–100kHz PWM signal; low logic >20ms forces shutdown; internal filter converts duty cycle to linear current scaling. |
| B2 (COMP) | Error amplifier output | Internal transconductance amplifier node; requires external RC compensation network to stabilize feedback loop. |
| B3 (GND) | Power and signal reference | Primary ground return for power path and analog circuitry; must be low-impedance and directly connected to input/output capacitor grounds. |
| C1 (EN) | Enable / 1-wire interface | Logic-high enables operation; low >2.5ms disables; also serves as bidirectional 1-wire bus for digital dimming commands and ACK response. |
| C2 (VIN) | Power supply input | 2.7–5.5V input; requires local 1–4.7µF X5R/X7R ceramic bypass capacitor placed adjacent to pin. |
| C3 (SW) | Switch node | Drain of internal 40V/0.2Ω N-MOSFET; connects to inductor and Schottky diode anode; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current regulation | Two matched 30mA sinks with 1% inter-channel matching - eliminates need for external current mirrors or balancing resistors in dual-display systems. |
| Hybrid dimming architecture | Simultaneous support for PWM analog dimming (5–100kHz) and 1-wire digital dimming (9-bit, 511-step) - enables flexible system-level brightness control with minimal MCU resource usage. |
| Integrated protection suite | Cycle-by-cycle current limit (1.8A normal / 1A startup), LED open/short detection, thermal shutdown (150°C), and 38V OVP - reduces external fault-monitoring circuitry. |
| Ultra-compact WLCSP packaging | 1.35mm × 1.35mm, 9-ball WLCSP with 0.4mm pitch - achieves <1.8mm² total footprint, ideal for thin smartphones and wearable displays. |
| Internal soft-start | Gradually ramps COMP voltage at enable - limits inrush current into output capacitors and prevents input voltage droop during startup. |
Applications
| Smartphone Dual-Display Backlight | Tablet Main Display Backlight |
|---|---|
|
Use Scenario: Driving two independent 6-LED white strings (e.g., front camera display + main screen) from a shared single-cell Li-ion battery. IC Role / Device Role / Timing Role: Dual-channel constant-current boost controller regulating each string to 20mA with matched brightness and synchronized dimming. Use Value: Eliminates separate drivers, reduces BOM count by 1, and maintains <1% luminance mismatch between displays under varying temperature and aging conditions. |
Use Scenario: Powering a 10-inch LCD panel with 12-series white LEDs requiring ~36V output from 3.7V nominal input. IC Role / Device Role / Timing Role: High-efficiency step-up converter with 600kHz switching and internal 40V MOSFET delivering stable 30mA per channel. Use Value: Enables use of smaller inductors (e.g., 10µH) and ceramic output caps instead of electrolytics, improving reliability and reducing board area by 35% vs. discrete solutions. |
| GPS Receiver Status Display | Portable Medical Monitor Backlight |
|
Use Scenario: Illuminating a small monochrome LCD segment (e.g., 3–4 LEDs) in battery-powered GPS units with strict quiescent current requirements. IC Role / Device Role / Timing Role: Low-IQ LED driver (2mA typical quiescent, 1µA shutdown) with programmable dimming via 1-wire interface. Use Value: Extends battery life beyond 12 months in standby mode while supporting instant-on brightness adjustment without MCU firmware overhead. |
Use Scenario: Backlighting critical diagnostic displays in portable ultrasound or ECG devices where flicker-free dimming and long-term stability are mandatory. IC Role / Device Role / Timing Role: Precision current source with ±2% accuracy and thermal derating behavior that maintains consistent luminance across -40°C to +85°C ambient. Use Value: Meets IEC 60601-1 luminance consistency requirements without recalibration; avoids visible brightness drift during extended clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel WLED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT9397BZSP | Fixed 1.2MHz switching frequency; no 1-wire interface; only PWM dimming; 36V OVP; 25mA max/channel. | Lacks digital dimming capability and has lower OVP margin; suitable only for cost-sensitive, non-reconfigurable designs. | Select when higher switching frequency is needed for smaller magnetics and PWM-only control suffices. |
| LM3409QMY/NOPB | External MOSFET driver; adjustable frequency (200kHz–2MHz); no integrated current sinks; requires external current sense and regulation. | Requires 4+ external components per channel; supports higher voltage/current but increases design complexity and footprint. | Select when >30mA/channel or >38V output is required, or when thermal management demands remote MOSFET placement. |
Compared with RT9397BZSP and LM3409QMY/NOPB, the MP3312LGC-Z uniquely integrates dual current sinks, 1-wire dimming, and 38V OVP in a sub-2mm² package - offering the lowest component count and smallest PCB area for portable dual-string backlighting below 30mA/channel.
Availability
MP3312LGC-Z is available at Aetrix Electronics and suitable for smartphone dual-display backlighting, tablet main display backlighting, GPS receiver status display, and portable medical monitor backlighting requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for MP3312LGC-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP3312LGC-Z belongs to MPS's WLED driver product line, engineered specifically for space-constrained, battery-powered portable displays requiring high current accuracy, dual-channel independence, and hybrid dimming flexibility.
FAQ
What is the minimum recommended ISET resistor value for MP3312LGC-Z?
The datasheet specifies a minimum full-scale current of 10mA. With VISET = 1.232V and KISET = 1020, the corresponding minimum ISET resistor is R = (1.232V / 10mA) × 1020 ≈ 125.7kΩ. Using a lower resistance risks exceeding the 30mA per-channel limit and violating absolute maximum ratings on LEDx pins.
Can MP3312LGC-Z drive more than 6 LEDs in series per string?
Yes - with VIN = 3.7V and VLED ≈ 3.2V per white LED, the theoretical maximum is ⌊38V / 3.2V⌋ = 11 LEDs. However, practical limits are imposed by efficiency drop and thermal rise; the typical application shows 6 LEDs (≈19.2V), and driving 9+ LEDs requires careful inductor selection and thermal validation per the 1.04W power dissipation limit.
How does the 1-wire interface handle multiple MP3312LGC-Z devices on the same EN line?
Each MP3312LGC-Z has a fixed 8-bit device address of 0x8F, so true multi-drop 1-wire operation is not supported. To control multiple units, either use separate EN lines per device or implement external logic (e.g., analog switch) to isolate the bus during programming - the IC does not support address arbitration or collision detection.
What happens if the ISET pin is left unconnected?
Leaving ISET floating violates the Absolute Maximum Ratings and causes undefined current regulation. The internal reference requires a defined DC path to GND via the external resistor; an open ISET may result in excessive or zero LED current, unstable COMP voltage, or latch-up due to input leakage accumulation - always connect RISET as specified.
Is the 38V OVP threshold adjustable externally?
No - the 38V OVP threshold is internally trimmed and fixed, with a tolerance of ±1.5V (37–39.5V). There is no external pin or resistor option to modify this threshold; system-level overvoltage protection beyond 39.5V must be implemented externally using a dedicated OVP IC or Zener clamp.
Does MP3312LGC-Z support synchronization to an external clock?
No - the MP3312LGC-Z uses an internal fixed-frequency 600kHz oscillator with no external sync input. Frequency variation is limited to ±20% over temperature and process; for EMI reduction, spread-spectrum or external synchronization is not supported and requires alternative drivers like the MPQ3367.
What is the maximum allowable thermal pad copper area for the WLCSP package?
The WLCSP1.35×1.35-9mm package does not include an exposed thermal pad; all nine solder balls serve as electrical connections (ISET, LED2, LED1, PWM, COMP, GND, EN, VIN, SW). Thermal conduction occurs through the silicon die and solder joints - PCB layout should maximize copper area under each ball, especially GND and VIN, per JEDEC J-STD-020 guidelines.
MP3312LGC-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 9-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 30mA
- Frequency:
- 600kHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-WLCSP (1.35x1.35)
MP3312LGC-Z FAQ
1.How can I place an order for MP3312LGC-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3312LGC-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 MP3312LGC-Z reliable?
The price and inventory of MP3312LGC-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3312LGC-Z is usually 5 days.
3.What payment methods are accepted for MP3312LGC-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3312LGC-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3312LGC-Z?
MP3312LGC-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3312LGC-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 MP3312LGC-Z?
For technical support, including MP3312LGC-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3312LGC-Z requirements.
6.How does Aetrix verify that MP3312LGC-Z is sourced from the original manufacturer or authorized distributors?
All MP3312LGC-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 MP3312LGC-Z meets industry standards.
7.What is the process for return or replacement of MP3312LGC-Z?
All MP3312LGC-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3312LGC-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 MP3312LGC-Z part is unused and in its original packaging.
Return procedure for MP3312LGC-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP3312LGC-Z Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
