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Monolithic Power Systems Inc. MP1528DK-LF
- Part No.:
- MP1528DK-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MP1528DK-LF.pdf
- Description:
- IC LED DRV RGLTR PWM 950MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,519
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Product details
Overview
MP1528DK-LF from Monolithic Power Systems is a step-up DC-DC converter LED driver IC designed to regulate current for up to nine series-connected white 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, 40V open-load shutdown, and supports analog/PWM brightness control via the BRT pin. Used in compact backlighting systems requiring precise 20mA per string.
For engineers reviewing the MP1528DK-LF datasheet, MP1528DK-LF pinout, MP1528DK-LF application, or MP1528DK-LF equivalent, key selection criteria include its 36V output capability, 950mA internal switch current limit, thermal shutdown at 160°C, UVLO at 2.65V, and dual-package availability (MSOP-8 and QFN-6) with validated open-circuit protection architecture.
Technical Context
The MP1528DK-LF employs constant off-time, variable-frequency control to maintain LED current regulation across wide input voltage and LED string voltage ranges. Its feedback comparator uses a 0.40V typical FB threshold referenced to a divided BRT voltage, enabling precise analog dimming from 0.27V–1.2V on the BRT pin.
Open-load protection is implemented by monitoring output voltage via the BIAS pin, triggering shutdown when VBIAS exceeds 40V. The internal 950mA current limit and 330ns minimum off-time ensure stable operation during startup and transient load conditions without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED String Voltage | Up to 36V - supports 9× white LEDs (~3.8V each) in series with margin. |
| Current Sense Threshold | 0.40V ±2% - enables high-accuracy LED current setting with low-power sense resistor. |
| Internal Switch RDS(on) | 0.63Ω - minimizes conduction loss at 20mA output, improving efficiency in portable designs. |
| Open-Load Shutdown Threshold | 40V at BIAS pin - prevents damage during LED string disconnection or cold-junction failure. |
| UVLO Rising Threshold | 2.65V with 100mV hysteresis - ensures reliable startup from depleted Li-ion cells down to ~2.55V. |
| Thermal Shutdown | 160°C - protects device under sustained overload or poor PCB thermal design. |
| BRT PWM Frequency Range | 100Hz–400Hz - compatible with standard microcontroller PWM peripherals without audible noise. |
Pinout & Package
MP1528DK-LF is packaged in an 8-pin MSOP (3mm × 3mm, 0.65mm pitch) with exposed thermal pad. Pin 1 is marked by notch or dot; pins are numbered counterclockwise from top-left corner.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unused terminal; must be left floating or tied to GND per layout guidelines - no internal connection. |
| 2 (FB) | Feedback Input | Monitors voltage across external sense resistor; regulates LED current to maintain 0.4V at this node. |
| 3 (GND) | Power Ground | Main return path for switch current, bias circuitry, and feedback reference - requires low-impedance PCB pour. |
| 4 (SW) | Switch Node Output | Drain of internal 0.63Ω MOSFET; connects to inductor and Schottky rectifier - high dv/dt node requiring tight routing. |
| 5 (EN) | Enable Control | Logic-level input (0.8–1.5V threshold); pulls device into shutdown mode (<1µA IQ) when <0.4V applied. |
| 6 (BIAS) | Output Voltage Monitor | Connects to LED string anode to detect open-circuit faults; also powers internal circuitry when tied to VOUT. |
| 7 (BRT) | Brightness Control | Analog dimming input (0.27–1.2V) or PWM dimming input (0.18V low / >1.2V high); sets FB reference via 1/3 attenuation. |
| 8 (NC) | No Connect | Unused terminal; electrically isolated - no internal bond wire or function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.63Ω MOSFET | Eliminates need for external high-side switch, reducing BOM count and board area in space-constrained handhelds. |
| 0.4V current-sense threshold | Enables use of low-value, low-power sense resistors (e.g., 20Ω @ 20mA = 8mW), minimizing thermal drift impact. |
| Open-load shutdown at 40V | Prevents uncontrolled voltage rise during LED string breakage - critical for safety-certified portable lighting designs. |
| Soft-start and current limiting | 330ns minimum off-time + 950mA peak switch current limit prevent inrush stress on inductor and diode during startup. |
| Dual dimming interface | Single BRT pin accepts both analog DC voltage and 100–400Hz PWM signals - simplifies firmware and hardware design flexibility. |
Applications
| Handheld Computers | PDA Phones |
|---|---|
|
Use Scenario: Backlighting for 3.5"–4.3" transflective LCDs in ruggedized field computers operating from 3.2–4.2V Li-ion batteries. IC Role / Device Role / Timing Role: Constant-current LED driver with integrated boost converter and open-circuit fault detection. Use Value: Delivers stable 20mA per LED across battery discharge curve while preventing overvoltage damage during display cable disconnect events. |
Use Scenario: Dual-mode display backlight in converged PDA/phone devices requiring seamless transition between ambient-light adaptive and manual brightness control. IC Role / Device Role / Timing Role: Analog/PWM-combined brightness controller with sub-1µA shutdown current for extended standby life. Use Value: Enables <10µA system sleep current via EN pin control and eliminates need for external dimming DAC or PWM generator. |
| Digital Cameras | Small LCD Displays |
|
Use Scenario: Flash-assisted focus assist illumination using 3–5 white LEDs in compact camera modules with tight thermal envelopes. IC Role / Device Role / Timing Role: High-efficiency boost driver with thermal shutdown (160°C) and fast transient response for burst-mode operation. Use Value: Maintains consistent LED intensity during rapid on/off cycles without thermal throttling or current droop. |
Use Scenario: Edge-lit monochrome or color STN/TFT displays in medical handhelds and industrial HMIs where EMI and size are constrained. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency-avoiding LED driver with 1nF C3 capacitor support for ripple suppression. Use Value: Reduces conducted EMI through optimized switching behavior and allows ceramic capacitor-only output filtering (no electrolytics). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1528DQ-LF | Same die in 6-pin 3mm×3mm QFN package; 50°C/W θJA vs MSOP-8's 150°C/W; no NC pins. | Better thermal performance in high-density layouts; requires different land pattern and reflow profile. | Select for thermally demanding applications or space-constrained PCBs where exposed pad soldering is feasible. |
| LT3466-1 (Analog Devices) | Higher 40V max output, but 1.25V FB threshold, external MOSFET required, no integrated BRT PWM logic. | Requires additional components for dimming and fault protection; higher BOM cost and layout complexity. | Choose only if >36V output or automotive-grade AEC-Q200 qualification is mandatory - not a drop-in replacement. |
Compared with MP1528DQ-LF, the MP1528DK-LF offers superior manufacturability in standard SMT lines due to MSOP-8's larger pitch and visibility, while LT3466-1 trades integration for higher voltage headroom and external flexibility - making MP1528DK-LF optimal for cost-sensitive, volume handheld backlighting.
Availability
MP1528DK-LF is available at Aetrix Electronics and suitable for handheld computers, PDA phones, and digital cameras requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP1528DK-LF 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, emphasizing integration, efficiency, and fault resilience in battery-powered consumer and industrial displays.
FAQ
What is the maximum number of white LEDs the MP1528DK-LF can drive in series?
The MP1528DK-LF is specified to drive up to nine white LEDs in series, assuming typical forward voltage of ~3.8V per LED at 20mA, resulting in ~34.2V total string voltage - within its 36V output capability and 40V open-load shutdown threshold. Driving more than nine LEDs risks exceeding safe operating limits and triggering BIAS-based shutdown.
Can the MP1528DK-LF operate without connecting the BIAS pin?
No - the BIAS pin must be connected either to the LED string anode (for open-load protection) or to the input supply (to disable protection and reduce quiescent current). Leaving BIAS floating violates Absolute Maximum Ratings and may cause erratic operation or latch-up, as it powers internal bias circuitry and enables overvoltage detection.
What is the recommended inductor value for MP1528DK-LF in a 9-LED, 20mA application?
Monolithic Power recommends 6.2µH or 6.8µH for optimal balance of efficiency, size, and transient response. Inductors must have ≥950mA saturation current rating and low DCR; values from 4.7µH to 22µH are acceptable, but lower values increase peak current stress and EMI, while higher values reduce efficiency at light loads.
Does the MP1528DK-LF support true 100% duty cycle for analog dimming?
No - the MP1528DK-LF uses constant off-time control with a minimum 330ns off-time, preventing 100% duty cycle. At maximum brightness (BRT ≥1.2V), the device achieves >95% effective duty cycle depending on input/output voltage ratio, but cannot sustain continuous conduction mode - intentional design to ensure reliable current sensing and thermal management.
How does the BRT pin distinguish between analog and PWM dimming modes?
The BRT pin detects mode automatically: analog mode requires a stable DC voltage between 0.27V and 1.2V; PWM mode requires a signal with low level <0.18V (forces switch OFF) and high level >1.2V (sets full-scale FB reference). The internal comparator and buffer circuitry interpret voltage thresholds - no configuration register or external selection is needed.
Is the MP1528DK-LF pin-compatible with earlier MP1528DK revisions?
Yes - MP1528DK-LF is a lead-free, RoHS-compliant version of the original MP1528DK, with identical pinout, electrical specifications, and thermal characteristics. The "-LF" suffix denotes lead-free finish only; no functional or mechanical changes affect compatibility with existing MSOP-8 footprints or schematics.
What is the purpose of the NC pins on the MP1528DK-LF MSOP-8 package?
Pins 1 and 8 are No Connect - physically present but not bonded to any internal circuitry. They must remain unconnected (floating) or optionally tied to GND for mechanical stability; routing traces or vias to them provides no electrical benefit and may risk contamination or solder bridging during assembly.
MP1528DK-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for MP1528DK-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1528DK-LF 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 reliable?
The price and inventory of MP1528DK-LF 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 is usually 5 days.
3.What payment methods are accepted for MP1528DK-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1528DK-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1528DK-LF?
MP1528DK-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1528DK-LF 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?
For technical support, including MP1528DK-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1528DK-LF requirements.
6.How does Aetrix verify that MP1528DK-LF is sourced from the original manufacturer or authorized distributors?
All MP1528DK-LF 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 meets industry standards.
7.What is the process for return or replacement of MP1528DK-LF?
All MP1528DK-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP1528DK-LF, 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 part is unused and in its original packaging.
Return procedure for MP1528DK-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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