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Monolithic Power Systems Inc. MP1528DK-LF-Z
- Part No.:
- MP1528DK-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP1528DK-LF-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 950MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,381
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Product details
Overview
MP1528DK-LF-Z from Monolithic Power Systems is a precision step-up white LED driver IC designed to regulate current for up to nine series-connected LEDs from a single-cell Li-ion battery (2.7V–36V input). It integrates a 0.63Ω power MOSFET, features 0.4V full-scale current-sense threshold, analog/PWM brightness control via BRT pin, and open-load shutdown triggered at 40V on BIAS pin. Used in compact LCD backlighting for handheld cameras and PDA phones.
For engineers reviewing the MP1528DK-LF-Z datasheet, MP1528DK-LF-Z pinout, MP1528DK-LF-Z application, or MP1528DK-LF-Z equivalent, key selection criteria include its 950mA internal current limit, constant off-time control architecture, thermal shutdown at 160°C, UVLO threshold of 2.65V (rising), and compatibility with 20mA LED strings requiring <0.4V sense loss.
Technical Context
The MP1528DK-LF-Z implements a constant off-time, current-limited, variable-frequency boost converter topology optimized for LED current regulation. Its feedback loop compares FB voltage against a 0.4V threshold derived from BRT input (attenuated 1:3), enabling precise analog dimming from 0.27V to 1.2V or PWM dimming at 100–400Hz.
Open-circuit protection is implemented via BIAS pin monitoring: when output voltage exceeds 40V, the device shuts down until EN is cycled. Internal thermal shutdown (160°C) and under-voltage lockout (2.65V rising, 100mV hysteresis) ensure robust operation across –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED String Capacity | Drives up to 9 series white LEDs; supports ≤36V output for typical 3.2–3.6V/LED configurations. |
| Input Voltage Range | 2.7V to 36V - enables direct operation from single-cell Li-ion (3.0–4.2V) or wide-input industrial rails. |
| Current Sense Threshold | 0.4V ±20mV - minimizes I²R loss across external sense resistor; enables use of low-value, high-precision resistors. |
| Internal Switch RDS(on) | 0.63Ω - reduces conduction loss in boost switch, supporting >85% efficiency at 20mA/9-LED load (VIN=3.6V). |
| Switch Current Limit | 950mA - sets maximum inductor peak current; defines safe operating area for 4.7–22µH inductors. |
| BRT Input Range (Analog) | 0.27V to 1.2V - linearly scales LED current from ~2.7mA to 20mA via 1/3 attenuation into FB comparator. |
| Open-Load Shutdown Threshold | 40V at BIAS pin - prevents overvoltage damage during LED string disconnection or cold-junction failure. |
Pinout & Package
MP1528DK-LF-Z is housed in an 8-pin MSOP package (3.0mm × 3.0mm × 1.0mm height) with exposed thermal pad on underside for enhanced heat dissipation. Pin 1 marked by dot; pins 1–8 arranged counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback Input | Connects to bottom of LED string via external sense resistor; regulates LED current by holding voltage across RSENSE at 0.4V. |
| GND (Pin 2) | Power Ground | Primary return path for LED current, switch current, and internal bias; must be low-impedance connection to thermal pad. |
| SW (Pin 3) | Switch Node Output | Drain of integrated 0.63Ω MOSFET; connects to inductor and Schottky rectifier; swings from GND to ≥40V. |
| BIAS (Pin 4) | Output Voltage Monitor / Bias Supply | Connected to top of LED string for open-load detection; also powers internal circuitry - can tie to VIN if fault protection not needed. |
| EN (Pin 5) | Enable Control | Active-high logic input (0.8–1.5V threshold); <0.4V disables regulator and reduces quiescent current to 3µA. |
| BRT (Pin 6) | Brightness Control | Analog dimming input (0.27–1.2V) or PWM signal (100–400Hz, low <0.18V, high >1.2V); controls FB reference via 1:3 attenuation. |
| NC (Pins 7, 8) | No Connect | Unbonded pins; must remain floating or grounded per layout guidelines - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.63Ω MOSFET | Eliminates need for external high-side switch; reduces BOM count and PCB footprint in space-constrained portable designs. |
| 0.4V current-sense threshold | Enables use of 20Ω sense resistor at 20mA (0.4V = 20mA × 20Ω), minimizing power loss (<8mW) and thermal drift impact. |
| Analog + PWM dual dimming | Single BRT pin supports both DC voltage control (0.27–1.2V) and digital PWM (100–400Hz), simplifying system-level brightness interface. |
| Open-load shutdown at 40V | Prevents uncontrolled voltage rise during LED string breakage; requires BIAS tied to output node - failsafe behavior verified in application testing. |
| Thermal shutdown (160°C) | Internally monitors die temperature; latches off until EN cycle resets - protects against sustained overload or poor heatsinking. |
Applications
| Handheld Digital Cameras | PDA Phones |
|---|---|
|
Use Scenario: Backlighting for 2.4"–3.5" color TFT LCDs with 3×3 LED matrix requiring uniform brightness and low EMI. IC Role / Device Role / Timing Role: Constant-current boost controller regulating 20mA per string; BRT pin driven by baseband processor's DAC or PWM output. Use Value: 0.4V sense threshold ensures minimal voltage headroom loss, enabling full 9-LED string operation even at end-of-battery (3.0V VIN). |
Use Scenario: Dual-mode display backlight in converged PDA/phone devices where brightness must scale dynamically with ambient light and UI state. IC Role / Device Role / Timing Role: LED driver with analog dimming (via PMIC DAC) and fast PWM fallback (100–400Hz) for flicker-free video playback. Use Value: Integrated 0.63Ω MOSFET and soft-start reduce inrush current and enable seamless transition between UI modes without visible flash. |
| Small LCD Instrument Panels | Portable Medical Displays |
|
Use Scenario: High-reliability backlight for automotive-grade instrument clusters using 6–9 series LEDs with extended temperature range requirements. IC Role / Device Role / Timing Role: Primary LED current regulator with UVLO (2.65V), thermal shutdown (160°C), and open-load protection for fail-safe operation. Use Value: 40V open-load threshold prevents overvoltage stress during connector vibration or solder joint fatigue - validated per AEC-Q200 stress profiles. |
Use Scenario: Battery-powered diagnostic displays (e.g., ultrasound handsets) requiring stable LED output across varying battery voltage and ambient temperature. IC Role / Device Role / Timing Role: Precision current source with <±2% regulation accuracy over –40°C to +85°C, enabled by low-drift 0.4V FB threshold. Use Value: Low 3µA shutdown current extends battery life in standby mode; MSOP8 package supports automated optical alignment during assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ1528DK-A | Automotive-grade variant (AEC-Q100 Grade 1); identical electrical specs but qualified for –40°C to +125°C junction temperature. | Required for under-hood or dashboard-mounted displays; includes enhanced ESD (±8kV HBM) and extended lifetime validation. | Select MPQ1528DK-A when operating ambient exceeds +85°C or automotive qualification is mandated. |
| LT3466-1EDD#TRPBF | Linear + boost hybrid architecture; higher quiescent current (1.2mA vs. 0.8mA), no integrated MOSFET (external 0.2Ω required), 0.2V sense threshold. | Supports tighter current matching across multiple strings but increases component count and board area. | Choose LT3466-1EDD when multi-string independent dimming or sub-1% current matching is critical. |
Compared with MP1528DK-LF-Z, MPQ1528DK-A adds automotive reliability without sacrificing efficiency or feature set, while LT3466-1EDD trades integration for superior channel-to-channel matching - making MP1528DK-LF-Z optimal for cost-sensitive, single-string portable backlighting.
Availability
MP1528DK-LF-Z is available at Aetrix Electronics and suitable for handheld digital cameras, PDA phones, and small LCD instrument panels requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP1528DK-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 power ICs, headquartered in Kirkland, WA, with global design and support centers.
The MP1528 product line targets portable LED backlighting applications, delivering integrated boost drivers with minimal external components, high efficiency, and robust fault protection for battery-powered displays.
FAQ
What is the minimum input voltage required for MP1528DK-LF-Z to start switching?
The MP1528DK-LF-Z initiates switching when BIAS voltage rises above 2.65V (UVLO rising threshold) with 100mV hysteresis. At 20mA LED current and 9-LED string (~32V), startup occurs reliably at VIN ≥ 2.7V - verified across –40°C to +85°C with 10µF input capacitance.
Can MP1528DK-LF-Z drive more than nine LEDs?
No - the device is characterized and guaranteed for up to nine series white LEDs. Attempting to drive ten or more exceeds the 36V absolute maximum BIAS rating and risks open-load shutdown activation or reduced regulation accuracy due to FB comparator saturation.
How does the BRT pin behave during PWM dimming?
When BRT receives a PWM signal with low <0.18V and high >1.2V at 100–400Hz, the internal comparator forces the switch OFF during low phase and regulates at full 0.4V threshold during high phase - achieving duty-cycle proportional LED current without external modulation circuitry.
Is the exposed thermal pad on the MSOP8 package electrically connected?
No - the exposed pad on MP1528DK-LF-Z (MSOP8) is thermally conductive only and must be soldered to a dedicated PCB copper pour for heat dissipation; it is not internally connected to GND or any other pin per MPS package drawings and thermal test reports.
What happens if the BIAS pin is left unconnected?
Leaving BIAS floating violates Absolute Maximum Ratings and may cause erratic operation or latch-up. If open-load protection is not needed, BIAS must be tied directly to VIN; if protection is required, it must connect to the top of the LED string - no high-impedance or RC network is permitted.
Does MP1528DK-LF-Z support I²C or SPI interface?
No - MP1528DK-LF-Z uses only analog voltage and PWM signals on the BRT pin for brightness control; it has no digital communication interface. Dimming is implemented entirely through external voltage sources or microcontroller GPIO outputs.
MP1528DK-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 36V
- Current - Output / Channel:
- 950mA (Switch)
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MP1528DK-LF-Z FAQ
1.How can I place an order for MP1528DK-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1528DK-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 MP1528DK-LF-Z reliable?
The price and inventory of MP1528DK-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 MP1528DK-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1528DK-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1528DK-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1528DK-LF-Z?
MP1528DK-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1528DK-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 MP1528DK-LF-Z?
For technical support, including MP1528DK-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1528DK-LF-Z requirements.
6.How does Aetrix verify that MP1528DK-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1528DK-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 MP1528DK-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1528DK-LF-Z?
All MP1528DK-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1528DK-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 MP1528DK-LF-Z part is unused and in its original packaging.
Return procedure for MP1528DK-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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