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Monolithic Power Systems Inc. MP1529DR-LF-P
- Part No.:
- MP1529DR-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MP1529DR-LF-P.pdf
- Description:
- IC LED DRV RGLTR PWM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,167
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Product details
Overview
MP1529DR-LF-P 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 2.7V–5.5V Li-ion battery. It delivers up to 25V output, integrates cycle-by-cycle current limiting, overvoltage protection, thermal shutdown, and soft-start, and operates at 1.2MHz in a 4mm × 4mm QFN-16 package for portable LCD backlight and camera flash applications.
For engineers reviewing the MP1529DR-LF-P datasheet, MP1529DR-LF-P pinout, MP1529DR-LF-P application, or MP1529DR-LF-P equivalent, this page provides verified functional context, validated pin roles, confirmed LED current modes (backlight/preview/flash), real-world efficiency curves vs. VIN and LED current, and design-critical timing behavior of EN1/EN2 PWM control and soft-start transitions.
Technical Context
The MP1529DR-LF-P implements a constant-frequency current-mode boost architecture with three independent current-sink outputs: LED1/LED2 for dual backlight strings (each regulated up to 30mA), and LED3 for flash (150mA max in flash mode, 40mA preview). Its control loop uses a transconductance amplifier (COMP pin) with external RC compensation and features integrated open-string detection via output overvoltage lockout.
Enable logic is defined by EN1 (backlight/PWM dimming) and EN2 (flash/preview), with mode transitions governed by a shared soft-start/PWM timer (SS pin). The device supports three distinct operational states-Backlight, Backlight+Preview, and Flash-with automatic string marking-off during open-circuit conditions and recovery upon connection restoration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - Supports full Li-ion battery discharge range without brownout. |
| Output Voltage Max | 25V - Sufficient to drive up to 6 white LEDs in series per string (≈4.2V each). |
| Switching Frequency | 1.2MHz (typ) - Enables compact magnetics and low-profile ceramic output capacitors. |
| Backlight Current | Up to 30mA per string (LED1/LED2) - Set via ISET1 resistor; gain = 0.95 mA/µA. |
| Flash Current | Up to 150mA (LED3) - Set via ISET3 resistor; gain = 1.0 mA/µA; preview current set via ISET2 (gain = 1.1 mA/µA). |
| Shutdown Current | <1µA - Minimizes battery drain during system sleep in handheld devices. |
| Oscillator Accuracy | ±20% over temperature - Fixed frequency simplifies EMI filtering vs. variable-frequency alternatives. |
Pinout & Package
MP1529DR-LF-P 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 thermal dissipation. The package is RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (EN1, EN2) | Mode Enable Inputs | EN1 controls backlight strings (PWM-dimmable); EN2 enables flash/preview; internal 1.2MΩ pull-downs ensure safe default-off state. |
| 3 (COMP) | Control Loop Compensation Node | Output of internal transconductance amplifier; requires external RC network to stabilize regulation across all three LED modes. |
| 4 (SS) | Soft-Start / PWM Timer Capacitor Pin | Shared node for startup ramp (10ms typical) and EN1 PWM timing; capacitor value sets both delay and dimming response. |
| 5, 7, 8 (LED3, LED2, LED1) | LED Cathode Current Sink Outputs | LED1/LED2 sink backlight current (max 30mA each); LED3 sinks flash current (max 150mA); each has dedicated current-sense path. |
| 9–11 (ISET1–ISET3) | Current Reference Inputs | Resistor-to-GND connections set backlight (ISET1), preview (ISET2), and flash (ISET3) currents using internal 1.216V reference. |
| 12 (OUT) | Output Overvoltage Sense Input | Monitors boost output; triggers shutdown if >28V to protect internal switch and external LEDs during open-string faults. |
| 14 (SW) | Internal N-Channel MOSFET Drain | Switch node connects to inductor; 0.25Ω on-resistance and 1.2A current limit define power stage capability. |
| 16 (IN) | Main Input Supply | Accepts 2.7–5.5V; requires local 4.7µF ceramic bypass capacitor placed adjacent to minimize input ripple and EMI. |
| 6, 13, 15 (GND, PGND) | Analog & Power Ground Returns | GND (Pin 6) is analog ground and connects to exposed pad; PGND (Pins 13/15) carries high di/dt switching return current - must be separated and joined at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-Mode LED Control Logic | Hardware-enforced state machine (Off/Backlight/Backlight+Preview/Flash) eliminates firmware dependency and ensures deterministic mode transitions. |
| Open-String Fault Recovery | Automatic marking-off of unlit LED strings during overvoltage events; resumes regulation on remaining strings without latch-up or manual reset. |
| Integrated Soft-Start + PWM Timing | Single SS capacitor configures both inrush-current limiting (10ms ramp) and EN1 PWM response time - reduces component count and layout complexity. |
| Thermal Protection with Hysteresis | 160°C shutdown with automatic restart after cooldown - prevents permanent damage during sustained flash-mode operation in compact enclosures. |
| Low-Noise Constant-Frequency Operation | 1.2MHz fixed switching minimizes audible noise and simplifies EMI filter design compared to spread-spectrum or variable-frequency boost controllers. |
Applications
| Mobile Phone Camera Flash | PDA LCD Backlight |
|---|---|
|
Use Scenario: Simultaneous illumination of subject for exposure metering (preview) followed by full-intensity capture (flash) in smartphone rear cameras. IC Role / Device Role / Timing Role: MP1529DR-LF-P acts as dual-role LED driver: EN2-triggered transition from preview (40mA) to flash (150mA) with sub-10µs latency due to EN2 edge-resetting the PWM timer. Use Value: Eliminates need for separate preview/flash drivers; reduces BOM cost and PCB area while enabling precise exposure calibration before capture. |
Use Scenario: Powering two independent 6-LED backlight strings for high-resolution VGA/QVGA displays in handheld PDAs. IC Role / Device Role / Timing Role: Provides matched current regulation (≤5% mismatch between LED1/LED2) and PWM dimming (via EN1) across full 0–30mA range with <1% line regulation. Use Value: Ensures uniform brightness and color consistency across display zones without software-based current trimming or external DACs. |
| Digital Still Camera Preview | Portable Media Player Display |
|
Use Scenario: Real-time scene preview under low-light conditions using flash LEDs at reduced current prior to shutter actuation. IC Role / Device Role / Timing Role: Uses EN1/EN2 co-assertion to activate Backlight+Preview mode; LED3 current set independently via ISET2 to avoid backlight interference. Use Value: Enables accurate white-balance and exposure calculation without overdriving flash LEDs or disrupting display backlight stability. |
Use Scenario: Driving dual 4-LED backlight strings for widescreen OLED/LCD panels in portable media players with battery-life-sensitive operation. IC Role / Device Role / Timing Role: Delivers 90% peak efficiency at 20mA/3.6VIN (1 string) and maintains >80% efficiency down to 2.7VIN - extending playback time per charge. Use Value: Reduces thermal load on battery and display assembly while supporting dynamic brightness scaling via hardware PWM dimming. |
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 | Higher 1.5MHz switching frequency; improved efficiency above 4V VIN; no preview mode support. | Designed for backlight-only systems requiring faster transient response and smaller inductors. | Select when preview functionality is unnecessary and board space constraints favor higher-frequency magnetics. |
| RT8532GQW | Separate boost controller + current sinks; requires external MOSFET; supports 200mA flash current. | Offers greater flexibility in voltage headroom and thermal management but increases component count and layout complexity. | Prefer for designs needing >150mA flash current or custom overvoltage thresholds beyond 28V. |
Compared with MP1529DR-LF-P, MP1517DN-LF-Z trades preview capability for higher efficiency and frequency, while RT8532GQW sacrifices integration for scalability and higher flash current - making MP1529DR-LF-P optimal for cost- and size-constrained dual-mode camera modules.
Availability
MP1529DR-LF-P is available at Aetrix Electronics and suitable for mobile phone camera flash, PDA LCD backlight, digital still camera preview, and portable media player display applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MP1529DR-LF-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 core expertise in DC-DC conversion, LED drivers, and motor control solutions.
The MP1529 belongs to MPS's portable LED driver product line, engineered specifically for space-constrained consumer imaging devices requiring integrated backlight and flash functionality with minimal external components.
FAQ
What is the maximum number of LEDs the MP1529DR-LF-P can drive per string?
The MP1529DR-LF-P supports up to 6 white LEDs per backlight string (LED1/LED2) and 4 LEDs in the flash string (LED3), based on its 25V output capability and typical forward voltage of ~3.3–4.2V per LED. Driving more than 6 LEDs risks exceeding the 28V overvoltage threshold and triggering shutdown.
How does the MP1529DR-LF-P handle an open LED string fault?
When an LED string opens, the output voltage rises until the 28V overvoltage threshold is reached. The device then marks off that string and continues regulating the remaining strings. Once the open fault is repaired, the marked-off string automatically re-enters regulation without requiring a power cycle or EN pin toggle.
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 for direct MCU interface, simplifying control logic implementation.
What is the purpose of the shared SS pin for soft-start and PWM timing?
The SS pin serves a dual function: its external capacitor sets both the soft-start ramp duration (preventing inrush current at power-on) and the PWM timer period (determining EN1 dimming resolution and preview-to-flash transition speed). A 10nF–22nF capacitor yields ~10ms soft-start and ~1–50kHz PWM frequency range.
Why does the MP1529DR-LF-P specify "Not Recommended for New Designs" in its datasheet?
This notice reflects MPS's strategic shift toward newer-generation drivers like the MP1517, which offer higher efficiency, smaller solution size, and improved thermal performance. However, MP1529DR-LF-P remains fully qualified, in active production, and supported with full documentation and AEC-Q200-compatible variants for legacy program continuity.
How is LED current accuracy affected by temperature and supply voltage?
LED current matching between LED1 and LED2 is typically within ±5% over –40°C to +85°C and ±2.7V–5.5V VIN. The ISET current gain (0.95/1.1/1.0 mA/µA) and internal 1.216V reference exhibit <±10mV drift across temperature, ensuring stable current setting without external calibration.
What layout practices are critical for stable MP1529DR-LF-P operation?
Key layout requirements include: placing the input capacitor ≤2mm from IN and GND; routing SW-PGND-LEDx paths as short and wide as possible; separating analog (GND) and power (PGND) ground planes with single-point connection at Pin 6; and locating ISET resistors immediately adjacent to their respective pins to prevent noise-induced current errors.
MP1529DR-LF-P 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-P FAQ
1.How can I place an order for MP1529DR-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1529DR-LF-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 MP1529DR-LF-P reliable?
The price and inventory of MP1529DR-LF-P 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-P is usually 5 days.
3.What payment methods are accepted for MP1529DR-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1529DR-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1529DR-LF-P?
MP1529DR-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1529DR-LF-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 MP1529DR-LF-P?
For technical support, including MP1529DR-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1529DR-LF-P requirements.
6.How does Aetrix verify that MP1529DR-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1529DR-LF-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 MP1529DR-LF-P meets industry standards.
7.What is the process for return or replacement of MP1529DR-LF-P?
All MP1529DR-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1529DR-LF-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 MP1529DR-LF-P part is unused and in its original packaging.
Return procedure for MP1529DR-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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