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Monolithic Power Systems Inc. MP1529DR-LF-Z
- Part No.:
- MP1529DR-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MP1529DR-LF-Z.pdf
- Description:
- IC LED DRV RGLTR PWM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,495
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Product details
Overview
MP1529DR-LF-Z from Monolithic Power Systems is a fixed-frequency step-up DC-DC converter IC designed to drive dual 6-LED backlight strings (up to 30mA each) and a 4-LED flash string (up to 150mA) from a single Li-ion battery (2.7V–5.5V input). It integrates three independent current sources, open-lamp overvoltage protection, cycle-by-cycle current limiting, thermal shutdown, and soft-start. Used in handheld imaging devices requiring simultaneous backlight illumination and high-current flash control.
For engineers reviewing the MP1529DR-LF-Z datasheet, MP1529DR-LF-Z pinout, MP1529DR-LF-Z application, or MP1529DR-LF-Z equivalent, key selection criteria include its 1.2MHz switching frequency, triple-mode enable logic (backlight/preview/flash), independent ISET1–ISET3 current programming, 25V output capability, and QFN16 (4mm × 4mm) thermal performance with θJA = 46°C/W.
Technical Context
The MP1529DR-LF-Z implements a constant-frequency current-mode boost architecture with internal 1.2MHz oscillator and N-channel MOSFET switch (RDS(on) = 0.25Ω). Its control loop uses transconductance amplifier output at COMP pin, compensated via external RC network, and regulates LED current through dedicated cathode-sink terminals (LED1, LED2, LED3).
Mode selection is determined by EN1 and EN2 logic states: EN1 high enables backlight strings (LED1/LED2); EN2 high enables preview or flash on LED3; both high activates backlight-plus-preview; EN2-only high triggers flash mode. The SS pin serves dual function as soft-start timing capacitor node and PWM timer reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - Supports full Li-ion battery discharge curve without brownout. |
| Output Voltage Max | 25V - Sufficient to drive up to 6-series white LEDs per string at typical VF ≈ 3.3V. |
| Switching Frequency | 1.2MHz (typ) - Enables compact magnetics and low-profile ceramic output capacitors. |
| Backlight Current | Up to 30mA per string (LED1/LED2) - Programmable via ISET1 resistor with 0.95mA/µA gain. |
| Flash Current | Up to 150mA (LED3) - Programmable via ISET3 resistor with 1.0mA/µA gain; preview current set separately via ISET2. |
| Shutdown Current | <1µA - Minimizes battery drain during system sleep in portable devices. |
| Thermal Shutdown | 160°C - Protects against sustained overload or poor PCB thermal design. |
Pinout & Package
MP1529DR-LF-Z is housed in a thermally enhanced 16-pin QFN package (4mm × 4mm, 0.5mm pitch) with exposed pad connected to GND (Pin 6) for optimal heat dissipation (θJA = 46°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (EN1, EN2) | Mode Control Inputs | Digital enables for backlight (EN1) and flash (EN2); internal 1.2MΩ pull-downs ensure defined state at power-up. |
| 3 (COMP) | Loop Compensation Node | Output of internal transconductance amplifier; requires external RC network for stable regulation across all modes. |
| 4 (SS) | Soft-Start / PWM Timer | Capacitor-connected node setting both startup ramp time (10ms typ) and PWM dimming timing window. |
| 5, 7, 8 (LED3, LED2, LED1) | LED Cathode Sink Terminals | Current-sink outputs driving flash (LED3) and dual backlight strings (LED1/LED2); each regulates independently. |
| 6 (GND) | Analog Ground | Reference for internal circuitry; exposed pad must be soldered to PCB ground plane for thermal and noise integrity. |
| 9–11 (ISET1–ISET3) | Current Programming Inputs | Voltage-controlled current references (1.216V internal VREF) setting backlight (ISET1), preview (ISET2), and flash (ISET3) currents. |
| 12 (OUT) | Output Overvoltage Sense | Monitors boost output; triggers shutdown if >28V to protect IC and LEDs from open-string fault conditions. |
| 14 (SW) | Internal Switch Drain | Drain of integrated 1.2A, 0.25Ω N-MOSFET; connects to inductor and flyback diode in boost topology. |
| 16 (IN) | Input Supply | Must be bypassed with ≥4.7µF ceramic capacitor placed adjacent to pin to suppress high-frequency ripple. |
| 13, 15 (PGND) | Power Ground | Low-impedance return path for SW switching current; separate from analog GND but tied at single point near exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Triple operational mode control | Independent EN1/EN2 logic enables seamless transition between backlight, backlight+preview, and flash-only modes without external sequencing. |
| Open-string fault recovery | Overvoltage detection automatically marks off non-functional LED strings while maintaining regulation on remaining strings-no manual reconfiguration needed. |
| PWM-compatible backlight dimming | EN1 accepts high-speed PWM (≥1kHz) for precise brightness control; LED1/LED2 respond directly while LED3 remains steady in preview/flash. |
| Integrated protection suite | Cycle-by-cycle current limit, UVLO (2.6V rising), thermal shutdown (160°C), and soft-start prevent inrush, overcurrent, and thermal runaway. |
| Compact footprint with thermal efficiency | 4mm × 4mm QFN package delivers 1.2A switch current and 25V output with θJA = 46°C/W-enables thin mobile PCB designs. |
Applications
| Mobile Phone Camera Module | Digital Still Camera Backlight |
|---|---|
|
Use Scenario: Simultaneous LCD screen illumination and scene preview before capture in smartphone front/rear cameras. IC Role / Device Role / Timing Role: Dual-role LED driver managing backlight strings (LED1/LED2) and flash string (LED3) under coordinated EN1/EN2 control with sub-10µs mode transitions. Use Value: Eliminates need for separate backlight and flash drivers, reducing BOM count and PCB area while enabling synchronized preview-to-flash handoff. |
Use Scenario: Powering high-brightness WLED arrays behind small-format LCD viewfinders in DSLR and mirrorless cameras. IC Role / Device Role / Timing Role: Constant-current boost controller delivering stable 30mA per string across varying battery voltage (2.7–4.2V) with <±3% current matching. Use Value: Maintains consistent display luminance during battery discharge, critical for accurate exposure preview and menu visibility. |
| Portable Media Player Display | Handheld Barcode Scanner UI |
|
Use Scenario: Driving dual 6-LED backlight strings for high-resolution TFT screens in ruggedized media players. IC Role / Device Role / Timing Role: High-efficiency (≥85% at 20mA/3.6V) step-up converter with integrated soft-start preventing input rail sag during power-on. Use Value: Extends battery life via low quiescent current (<1µA shutdown) and high conversion efficiency across full load and input range. |
Use Scenario: Illuminating status LEDs and small OLED displays in industrial-grade barcode scanners requiring flash-assisted aiming. IC Role / Device Role / Timing Role: Single-chip solution providing both always-on UI backlight (LED1/LED2) and momentary high-intensity flash (LED3 @ 150mA) from one Li-ion cell. Use Value: Reduces component count versus discrete boost + linear flash driver solutions, improving reliability and easing EMI compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1517DN-LF-Z | Successor device with improved efficiency (up to 90%), lower RDS(on) (0.18Ω), and extended temperature range (–40°C to +125°C). | Same pinout and functional compatibility; supports identical backlight+flash use cases with tighter current accuracy (±2% vs ±5%). | Select MP1517DN-LF-Z for new designs requiring higher reliability, longer battery runtime, or automotive-adjacent thermal margins. |
| RT8542GQW | Fixed-frequency boost LED driver with dual backlight channels (30mA each) but no integrated flash mode; requires external logic for flash control. | Lacks native preview/flash sequencing; supports only backlight operation unless paired with additional MOSFET and gate driver. | Choose RT8542GQW only when flash functionality is unnecessary or implemented externally for cost-sensitive non-camera applications. |
Compared with MP1529DR-LF-Z, MP1517DN-LF-Z offers measurable gains in efficiency and thermal robustness while maintaining drop-in compatibility, whereas RT8542GQW reduces integration level and requires added components to replicate flash sequencing-making MP1529DR-LF-Z uniquely suited for compact camera subsystems demanding single-chip multimode control.
Availability
MP1529DR-LF-Z is available at Aetrix Electronics and suitable for mobile phone camera modules, digital still camera displays, and portable media player backlight systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MP1529DR-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, with core expertise in DC-DC conversion, LED drivers, and motor control.
The MP1529 belongs to MPS's white LED backlight and flash driver product line, engineered specifically for space-constrained portable imaging devices needing integrated, multi-mode LED current regulation from a single Li-ion cell.
FAQ
What is the maximum number of LEDs the MP1529DR-LF-Z can drive per string?
The MP1529DR-LF-Z supports up to 6-series white LEDs per backlight string (LED1/LED2) and 4-series LEDs in the flash string (LED3), based on its 25V output capability and typical forward voltage of 3.3V per LED. Driving more than 6 LEDs risks exceeding the 28V overvoltage threshold and triggering shutdown.
How does the MP1529DR-LF-Z handle an open LED string fault?
When an LED string opens, the MP1529DR-LF-Z detects overvoltage at the OUT pin (>28V), marks that string as "off," and continues regulating remaining functional strings. Output voltage is then governed by the highest-voltage active string, ensuring uninterrupted backlight or flash operation without external intervention.
Can EN1 and EN2 be driven by microcontroller GPIO pins directly?
Yes-EN1 and EN2 accept standard CMOS logic levels (VIH ≥ 1.4V, VIL ≤ 0.3V) and feature internal 1.2MΩ pull-down resistors. No external level-shifting or current-limiting resistors are required, simplifying interface with 1.8V or 3.3V microcontrollers.
What is the purpose of the SS pin beyond soft-start?
The SS pin serves a dual role: it sets the soft-start ramp time (typically 10ms with 16nF) and also functions as the PWM timer for EN1 dimming. When EN1 PWM frequency exceeds the SS timer period, the part maintains continuous backlight operation; slower PWM causes mode transitions or shutdown depending on EN2 state.
Is the MP1529DR-LF-Z RoHS-compliant and lead-free?
Yes-the "-LF" suffix in MP1529DR-LF-Z explicitly denotes lead-free packaging, and the device complies with RoHS Directive 2011/65/EU. The QFN16 package uses matte tin plating over copper leadframe and meets JEDEC J-STD-020 moisture sensitivity level 3.
Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?
This notice indicates Monolithic Power Systems has superseded the MP1529DR-LF-Z with the MP1517DN-LF-Z, which offers improved specs (e.g., higher efficiency, lower RDS(on), wider temp range). However, MP1529DR-LF-Z remains fully qualified, in active production, and supported for legacy design refreshes and existing BOM continuity.
What is the recommended output capacitor value and type?
A 1µF to 4.7µF X7R ceramic capacitor is recommended for the output. Ceramic dielectrics minimize ESR-related ripple at 1.2MHz switching frequency; placement must be close to the OUT and PGND pins to reduce loop inductance and high-frequency noise.
MP1529DR-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 25V
- Current - Output / Channel:
- 30mA, 150mA (Flash)
- Frequency:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
MP1529DR-LF-Z FAQ
1.How can I place an order for MP1529DR-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1529DR-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 MP1529DR-LF-Z reliable?
The price and inventory of MP1529DR-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 MP1529DR-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1529DR-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1529DR-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1529DR-LF-Z?
MP1529DR-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1529DR-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 MP1529DR-LF-Z?
For technical support, including MP1529DR-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1529DR-LF-Z requirements.
6.How does Aetrix verify that MP1529DR-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1529DR-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 MP1529DR-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1529DR-LF-Z?
All MP1529DR-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1529DR-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 MP1529DR-LF-Z part is unused and in its original packaging.
Return procedure for MP1529DR-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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