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Monolithic Power Systems Inc. MP3312LGC-P
- Part No.:
- MP3312LGC-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
MP3312LGC-P.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
MP3312LGC-P from Monolithic Power Systems is a dual-channel, fixed-frequency boost white LED driver with integrated 40V N-channel MOSFET, designed for single-cell Li-ion powered displays. It delivers up to 30mA per channel with ±2% current accuracy, 1% inter-channel matching, and 38V overvoltage protection, operating from 2.7V–5.5V input in compact WLCSP1.35×1.35-9mm packaging for space-constrained mobile backlighting.
For engineers reviewing the MP3312LGC-P datasheet, MP3312LGC-P pinout, MP3312LGC-P application, or MP3312LGC-P equivalent, this device supports both PWM analog dimming (5–100kHz) and 1-wire digital dimming with 9-bit resolution-critical for precise brightness control in feature phones, tablets, and sub-10-inch LCDs.
Technical Context
The MP3312LGC-P uses peak-current-mode control with a fixed 600kHz switching frequency and internal soft-start to limit inrush current. Its dual regulated current sinks operate independently, automatically selecting the highest required LED string voltage to maintain regulation across mismatched strings.
It integrates cycle-by-cycle current limiting (1.8A nominal, 1A startup), thermal shutdown (150°C trip, 25°C hysteresis), LED open/short detection, and UVLO (2.6V rising threshold). The 1-wire interface on EN enables bidirectional digital dimming with ACK feedback support and 24-bit command structure including 9-bit dimming data and device address 0x8F.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V–5.5V - compatible with single-cell Li-ion battery systems across full discharge curve. |
| Switching Frequency | 600kHz (±20%) - enables small external inductors (e.g., 4.7–10µH) and reduces EMI filtering burden. |
| Max Output Voltage (OVP) | 38V - protects against LED string open-circuit failure while supporting up to 10 white LEDs in series per channel. |
| LED Current Accuracy | ±2% - ensures consistent luminance across production units without factory calibration. |
| Inter-Channel Matching | 1% - maintains uniform brightness between dual display zones or front/rear lighting paths. |
| Digital Dimming Resolution | 9-bit (1/511 step) - provides fine-grained brightness control for ambient-adaptive UIs. |
| Thermal Shutdown Threshold | 150°C - safeguards silicon die under sustained high-power operation in sealed handheld enclosures. |
Pinout & Package
MP3312LGC-P is housed in a 1.35mm × 1.35mm, 9-ball WLCSP package with 0.4mm pitch and bottom-side solder balls. Thermal performance is optimized via direct die-to-PCB conduction through the exposed substrate.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (ISET) | Current reference input | Resistor-connected node setting full-scale LED current (e.g., 63.4kΩ → 20mA); must not be left floating. |
| A2 (LED2) | Channel 2 current sink | Active-low current output for second LED string; internally clamped to VOUT during short-string fault. |
| A3 (LED1) | Channel 1 current sink | Active-low current output for primary LED string; auto-selects bus voltage based on higher of LED1/LED2 voltage. |
| B1 (PWM) | Analog dimming control | Accepts 5–100kHz PWM signal; low logic >20ms forces shutdown; internal filter enables smooth current scaling. |
| B2 (COMP) | Error amplifier output | Compensation node requiring external capacitor (e.g., 330nF) to stabilize current regulation loop. |
| B3 (GND) | Power and signal reference | Common return path for ISET, LED1/LED2, and internal circuitry; requires low-impedance PCB plane connection. |
| C1 (EN) | Enable / 1-wire interface | Multi-function pin: logic high enables IC; falling edge initiates 1-wire protocol with 1ms detection window and 9-bit dimming data. |
| C2 (VIN) | Power supply input | 2.7–5.5V input requiring local 1–4.7µF ceramic bypass capacitor near ball for noise suppression. |
| C3 (SW) | Internal MOSFET drain | Switching node connecting to external inductor and Schottky diode; high dv/dt demands tight layout and ground shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current sinks | Enables asymmetric LED string configurations (e.g., 6 LEDs on CH1, 8 on CH2) without external balancing components. |
| Integrated 40V/0.2Ω N-MOSFET | Eliminates external high-voltage switch, reducing BOM count and PCB area while maintaining >88% efficiency at 20mA/string. |
| 1-wire digital dimming interface | Uses single EN pin for bidirectional communication (24-bit commands, ACK optional), freeing GPIO resources in resource-limited MCUs. |
| Comprehensive fault protection | Combines LED open/short detection, cycle-by-cycle current limit, UVLO, and thermal shutdown-reducing need for external supervision circuits. |
| Internal soft-start | Gradually ramps COMP voltage during enable, limiting inrush current into output capacitors and preventing input voltage droop. |
Applications
| Smartphone Backlighting | Tablet Display Lighting |
|---|---|
|
Use Scenario: Driving dual-zone white LED arrays behind AMOLED or LCD panels in compact handheld devices with single-cell Li-ion power. IC Role / Device Role / Timing Role: Dual-channel constant-current source regulating brightness via PWM or 1-wire commands; manages boost voltage dynamically per string. Use Value: 1% current matching ensures uniform screen luminance; 38V OVP prevents damage during LED open-circuit events common in flex-cable assemblies. |
Use Scenario: Powering high-brightness backlight for 7–10 inch tablets where thermal density and board space constrain discrete solutions. IC Role / Device Role / Timing Role: Fixed-frequency boost controller with integrated MOSFET and dual current sinks, eliminating external switch and reducing component count by ≥4. Use Value: 600kHz operation allows use of 4.7µH inductors <1.0mm height; WLCSP package fits beneath display bezel without interfering with touch sensor layers. |
| GPS Navigation Unit Displays | Portable Medical Monitor Screens |
|
Use Scenario: Illuminating outdoor-readable TFT displays in automotive-grade GPS receivers subject to wide temperature (-40°C to +85°C) and vibration stress. IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown (150°C) and UVLO hysteresis (200mV), ensuring reliable start-up after cold cranking. Use Value: ±2% current accuracy maintains consistent brightness across temperature; short-string detection prevents false fault triggers during intermittent LED contact. |
Use Scenario: Providing flicker-free, precisely dimmable backlighting for clinical-grade portable monitors requiring Class II medical EMC compliance. IC Role / Device Role / Timing Role: Low-noise current regulator using peak-current-mode control and internal compensation to minimize conducted EMI from switching node. Use Value: 9-bit digital dimming enables calibrated brightness steps for diagnostic image viewing; RoHS/halogen-free WLCSP meets IEC 60601-1 material requirements. |
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 1MHz switching frequency; no 1-wire interface; requires external MOSFET; 36V OVP. | Lacks digital dimming capability; suited for cost-sensitive designs where only PWM dimming is needed. | Select when board space allows larger inductor and system MCU lacks 1-wire peripheral support. |
| TPS61165DRVR | Single-channel output; 1.2MHz switching; integrated 40V MOSFET; 40V OVP; I²C interface instead of 1-wire. | Requires two ICs for dual-channel operation; I²C needs dedicated bus lines and pull-ups. | Prefer when design already uses I²C infrastructure and channel independence is less critical than footprint reduction per channel. |
Compared with RT9397BZSP and TPS61165DRVR, the MP3312LGC-P uniquely combines dual-channel integration, 1-wire dimming on a single pin, and 38V OVP in a 1.35mm² WLCSP-reducing total solution size by ≥35% and eliminating external MOSFETs and I²C routing overhead.
Availability
MP3312LGC-P is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display lighting, GPS navigation unit displays, and portable medical monitor screens requiring stable component supply across extended product lifecycles.
Supply support for MP3312LGC-P 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-P belongs to MPS's white LED driver product line, engineered specifically for ultra-compact, high-efficiency backlighting in battery-powered portable displays with stringent thermal and EMI constraints.
FAQ
What is the minimum recommended ISET resistor value for MP3312LGC-P?
The datasheet specifies VISET = 1.232V (typical) and KISET = 1020. To avoid exceeding the 30mA maximum per channel, the minimum RISET is calculated as R = (VISET × 1020) / ILED. For 30mA, Rmin ≈ 41.8kΩ. Using lower values risks overcurrent and thermal shutdown; 42.2kΩ is the nearest standard E96 value.
How does the MP3312LGC-P handle unused LED channels?
If one channel is unused (e.g., only CH1 active), the corresponding LEDX pin (e.g., LED2) must be connected directly to GND. Leaving it floating disables open-string protection and may cause COMP voltage instability. This grounds the current sink and removes it from regulation feedback.
Can the MP3312LGC-P drive more than 6 LEDs per string?
Yes-up to 10 white LEDs (VF ≈ 3.2V each) can be driven per channel, as 10 × 3.2V = 32V remains below the 38V OVP threshold. However, efficiency drops above 8 LEDs due to increased duty cycle; thermal derating must be verified at 125°C junction temperature.
What is the purpose of the tDELAY and tDETECTION timing parameters in 1-wire mode?
tDELAY (100µs) defines the minimum high-time after EN rising edge before the 1-wire detection window opens. tDETECTION (260µs) is the minimum low-pulse width required to initiate bit sampling. Their sum must stay within tWIN (1ms) to ensure reliable command recognition without false triggering.
Does MP3312LGC-P support simultaneous analog and digital dimming?
No-the two dimming modes are mutually exclusive. When EN is used for 1-wire communication, PWM dimming is disabled. Conversely, applying a valid PWM signal to the PWM pin overrides 1-wire functionality. The IC detects mode based on which pin receives active control signals first after enable.
What is the maximum allowable inductor DCR for stable operation at 30mA/channel?
At 30mA per channel and 600kHz, peak inductor current reaches ~1.2A. To keep copper loss below 150mW (limiting θJA rise), DCR should not exceed 125mΩ. Inductors rated ≥1.5A saturation current and ≤100mΩ DCR (e.g., Coilcraft XAL5030-472MEB) are recommended.
How does the MP3312LGC-P respond to an LED short-string fault?
When LEDX voltage exceeds 5V and current exceeds 8% of full-scale for >8ms, the affected channel's current sink is disabled. VOUT continues regulating the healthy channel. Recovery requires cycling EN or VIN-no automatic retry to prevent repeated stress on shorted LEDs.
MP3312LGC-P 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-P FAQ
1.How can I place an order for MP3312LGC-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3312LGC-P 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-P reliable?
The price and inventory of MP3312LGC-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3312LGC-P is usually 5 days.
3.What payment methods are accepted for MP3312LGC-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3312LGC-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3312LGC-P?
MP3312LGC-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3312LGC-P 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-P?
For technical support, including MP3312LGC-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3312LGC-P requirements.
6.How does Aetrix verify that MP3312LGC-P is sourced from the original manufacturer or authorized distributors?
All MP3312LGC-P 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-P meets industry standards.
7.What is the process for return or replacement of MP3312LGC-P?
All MP3312LGC-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3312LGC-P, 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-P part is unused and in its original packaging.
Return procedure for MP3312LGC-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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