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Monolithic Power Systems Inc. MP2370DJ-LF-Z
- Part No.:
- MP2370DJ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
MP2370DJ-LF-Z.pdf
- Description:
- IC LED DRIVER RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,032
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Product details
Overview
MP2370DJ-LF-Z from Monolithic Power Systems is a monolithic step-down white LED driver IC with integrated 0.35Ω power MOSFET, delivering up to 1.2A peak output current across 4.5V–24V input range, fixed 1.4MHz switching frequency, and 0.15V feedback reference voltage. It operates in current-mode buck topology for fast transient response and is used in high-efficiency WLED backlighting for portable displays.
For engineers reviewing the MP2370DJ-LF-Z datasheet, MP2370DJ-LF-Z pinout, MP2370DJ-LF-Z application, or MP2370DJ-LF-Z equivalent, key selection criteria include its 1.2A peak current capability, TSOT23-6 package thermal resistance (θJA = 220°C/W), cycle-by-cycle overcurrent protection, and PWM dimming support via EN pin with ≥240μs minimum on-time.
Technical Context
The MP2370DJ-LF-Z implements a current-mode synchronous buck regulator architecture with internal slope compensation and a 1.4MHz oscillator that folds back to 700kHz under zero-feedback conditions. Its error amplifier compares FB voltage against a precision 0.15V bandgap reference and drives the PWM comparator to regulate peak inductor current.
Bootstrap gate drive enables high-side N-channel MOSFET operation; the BST capacitor charges through an internal diode during SW low phase. Protection includes thermal shutdown at 150°C, cycle-by-cycle current limiting at 1.8A, and UVLO with 2.8V turn-on threshold and 150mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and automotive LED supply rails without pre-regulation. |
| Peak Output Current | 1.2A - sufficient to drive multi-string or high-brightness single-string white LEDs. |
| Switching Frequency | 1.4MHz (typ) - enables compact external magnetics and reduces EMI below AM band. |
| Feedback Reference Voltage | 0.15V ±5mV - low-sense voltage minimizes I²R loss in current-sense resistor and improves efficiency. |
| Internal MOSFET RDS(on) | 0.35Ω - integrated switch eliminates external FET, reducing BOM count and layout complexity. |
| Shutdown Quiescent Current | 0.1μA - enables ultra-low-power standby in battery-powered display systems. |
| Thermal Shutdown Threshold | 150°C - protects die integrity under sustained overload or poor PCB thermal design. |
Pinout & Package
MP2370DJ-LF-Z is housed in a RoHS-compliant TSOT23-6 package (2.9mm × 1.6mm × 0.9mm), optimized for space-constrained LED backlight designs. Thermal resistance θJA = 220°C/W on standard 4-layer PCB.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power Input | Accepts 4.5V–24V unregulated supply; requires local 4.7μF ceramic decoupling. |
| 2 (EN) | Enable Control | Logic-level input: >1.5V enables regulation; <0.4V disables with 0.1μA shutdown current. |
| 3 (FB) | Current Sense Feedback | 0.15V reference node; connects to current-sense resistor to set LED current. |
| 4 (GND) | Analog/Digital Ground | Common return for FB, EN, and internal circuitry; must be routed outside high-di/dt paths. |
| 5 (SW) | Switch Node | Drives external inductor; high dv/dt node requiring short, isolated trace routing. |
| 6 (BST) | Bootstrap Supply | Connects to SW via 0.1μF ceramic capacitor to generate floating gate drive for internal MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| Cap-less operation support | Stable with no output capacitor when 680pF added in feedback loop - reduces component count and board area in cost-sensitive designs. |
| Thermal shutdown with auto-recovery | 150°C trip point with hysteresis - prevents permanent damage while enabling automatic resumption after cooling. |
| PWM dimming on EN pin | Minimum 240μs on-time required for linear dimming - allows direct microcontroller GPIO control without dedicated dimming IC. |
| Low ESR ceramic capacitor compatibility | Stable with X5R/X7R MLCCs down to 2.2μF - avoids costly tantalum or electrolytic capacitors and improves reliability. |
| Cycle-by-cycle current limiting | 1.8A peak limit - protects internal MOSFET and external inductor during short-circuit or startup surge. |
Applications
| Portable Display Backlighting | Automotive Interior Lighting |
|---|---|
Use Scenario: Driving 3W white LED strings in handheld tablets or e-readers powered by single-cell Li-ion (3.0–4.2V) with boost pre-regulator or dual-cell input (7–8.4V). IC Role / Device Role / Timing Role: Constant-current buck LED driver regulating 1.2A output with 1.4MHz switching to minimize inductor size and audible noise. Use Value: Enables thin form factor via TSOT23-6 package and cap-less configuration, reducing total solution height to <1.0mm. | Use Scenario: Illuminating dashboard LCDs and ambient footwell LEDs in 12V vehicle electrical systems with load dump transients up to 24V. IC Role / Device Role / Timing Role: High-input-voltage LED driver with UVLO hysteresis and thermal shutdown to survive cold-crank and hot-soak conditions. Use Value: Maintains stable 0.15V sense accuracy across –40°C to +85°C ambient, ensuring consistent brightness without calibration. |
| Industrial HMI Panels | Medical Diagnostic Displays |
Use Scenario: Powering high-CRI LED arrays in factory-floor HMIs exposed to wide temperature swings and EMI-rich environments. IC Role / Device Role / Timing Role: Robust current-mode controller with 700kHz foldback frequency to sustain regulation during line dips and maintain dimming fidelity. Use Value: Delivers 87% peak efficiency at 1A load, minimizing heat buildup in sealed enclosures without forced airflow. | Use Scenario: Backlighting critical diagnostic monitors where flicker-free dimming and long-term current stability are mandatory. IC Role / Device Role / Timing Role: Precision 0.15V feedback reference with <±5mV tolerance ensures <1% LED current drift over time and temperature. Use Value: Supports PWM dimming down to 0.1% duty cycle with linear response, meeting IEC 62304 Class C safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current step-down LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3466-1 (Analog Devices) | Fixed 1.2MHz frequency; 1.3A peak current; requires external MOSFET; higher 0.2V sense voltage. | Higher BOM count and layout complexity due to external FET; less efficient at low currents due to higher VSENSE. | Select when needing higher VIN max (36V) or adjustable frequency; avoid if minimizing footprint and component count is critical. |
| TPS61165 (Texas Instruments) | Boost topology; 40V output capability; 1.2A switch current; integrated Schottky; 1.2MHz switching. | Designed for driving series-connected LEDs from low-voltage sources (e.g., 2.7–6V); not suitable for buck-only 12–24V input systems. | Choose only for battery-powered single-LED or 2–3 LED string applications; incompatible with MP2370DJ-LF-Z's buck architecture and input range. |
Compared with LT3466-1 and TPS61165, MP2370DJ-LF-Z offers lower system cost and smaller PCB area via integrated MOSFET and TSOT23-6 packaging, while delivering superior efficiency in 4.5–24V buck LED applications - but lacks boost capability or adjustable frequency.
Availability
MP2370DJ-LF-Z is available at Aetrix Electronics and suitable for portable display backlighting, automotive interior lighting, and industrial HMI panels requiring stable component supply, RoHS compliance, and lead-free assembly compatibility.
Supply support for MP2370DJ-LF-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 mixed-signal ICs for power management, motion control, and interface applications.
The MP2370 belongs to MPS's White LED Driver product line, engineered specifically for high-efficiency, compact-area constant-current buck regulation in display and lighting systems with stringent thermal and EMI constraints.
FAQ
What is the minimum recommended PWM dimming on-time for linear brightness control?
The MP2370DJ-LF-Z requires ≥240μs minimum on-time at the EN pin for linear PWM dimming performance across temperature. This value is specified at –40°C to +125°C junction range and ensures consistent dimming ratio without visible steps or flicker in display applications.
Can MP2370DJ-LF-Z operate without an output capacitor?
Yes - MP2370DJ-LF-Z supports cap-less operation by adding a 680pF capacitor between FB and GND. This maintains loop stability while eliminating the output capacitor, reducing bill-of-materials and PCB area in space-constrained designs.
What is the purpose of the BST pin and how should it be configured?
The BST pin supplies the floating gate drive voltage for the internal high-side MOSFET. It must be connected to SW via a 0.1μF ceramic capacitor. For VIN < 5V, an external diode from IN to BST is recommended to ensure sufficient bootstrap voltage and full 1.2A output capability.
How does the MP2370DJ-LF-Z handle overcurrent conditions?
It employs cycle-by-cycle current limiting with a 1.8A threshold, measured at the internal MOSFET source. When exceeded, the switch turns off immediately within the same clock cycle. Combined with thermal shutdown at 150°C, this provides robust fault protection without latch-off behavior.
What is the significance of the 0.15V feedback reference voltage?
The 0.15V reference sets LED current via RSENSE = 0.15V / ILED. Its low value minimizes power loss in the sense resistor (e.g., 150mΩ for 1A), improving overall efficiency and reducing thermal stress compared to higher-reference drivers (e.g., 0.2V or 0.25V).
Does MP2370DJ-LF-Z support adjustable switching frequency?
No - MP2370DJ-LF-Z has a fixed 1.4MHz oscillator. It folds back to 700kHz only under zero-feedback (shorted FB) fault condition. Frequency adjustment is not supported; external synchronization or programmability is absent per datasheet Rev. 1.1.
What is the maximum continuous output current at 85°C ambient?
At TA = 85°C, the TSOT23-6 package's θJA = 220°C/W limits continuous output to ~0.75A before thermal shutdown activates, assuming no PCB copper pour. With 2-in² 2oz copper thermal pad, derating improves to ~1.0A continuous under natural convection.
MP2370DJ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 15V
- Current - Output / Channel:
- -
- Frequency:
- 1.4MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
MP2370DJ-LF-Z FAQ
1.How can I place an order for MP2370DJ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2370DJ-LF-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 MP2370DJ-LF-Z reliable?
The price and inventory of MP2370DJ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2370DJ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2370DJ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2370DJ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2370DJ-LF-Z?
MP2370DJ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2370DJ-LF-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 MP2370DJ-LF-Z?
For technical support, including MP2370DJ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2370DJ-LF-Z requirements.
6.How does Aetrix verify that MP2370DJ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2370DJ-LF-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 MP2370DJ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2370DJ-LF-Z?
All MP2370DJ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2370DJ-LF-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 MP2370DJ-LF-Z part is unused and in its original packaging.
Return procedure for MP2370DJ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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