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Monolithic Power Systems Inc. MP1517DR-LF-P
- Part No.:
- MP1517DR-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MP1517DR-LF-P.pdf
- Description:
- IC REG BST FLYBACK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,952
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Product details
Overview
MP1517DR-LF-P from Monolithic Power Systems is a fixed-frequency, current-mode step-up DC-DC converter with 3A output capability, 1.1MHz switching frequency, and 25V maximum output voltage. It integrates a 150mΩ N-channel MOSFET switch, features 0.7V feedback threshold for high-efficiency white LED flash drivers, and includes open-load shutdown, thermal shutdown, and soft-start. It is used in cell phone camera flash circuits requiring compact, high-current boost regulation.
For engineers reviewing the MP1517DR-LF-P datasheet, MP1517DR-LF-P pinout, MP1517DR-LF-P application, or MP1517DR-LF-P equivalent, key selection criteria include input voltage range (2.6V–25V), peak switch current limit (4A), OLS fault protection threshold (27V), QFN16 thermal performance (θJA = 46°C/W), and compensation flexibility via COMP pin.
Technical Context
The MP1517DR-LF-P employs a fixed 1.1MHz current-mode PWM architecture with internal transconductance error amplifier (GEA = 350µA/V, AVEA = 400V/V) and external compensation network at COMP. Its control loop supports optimization across wide VIN (2.6V–25V), VOUT (3.3V–25V), and load conditions.
It integrates a 2.4V LDO (BP pin) powering internal circuitry, uses cycle-by-cycle current limiting with 4A peak threshold, and implements open-load detection via OLS pin sensing output voltage-shutting down SW when VOLS > 27V and restarting in soft-start mode upon recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1MHz typical; enables use of small inductors & ceramic capacitors for space-constrained portable designs. |
| Input Voltage Range | 2.6V to 25V; supports single-cell Li-ion (2.6V min after discharge) up to industrial bus inputs. |
| Output Voltage Range | 3.3V to 25V; regulated via resistive divider on FB pin with 700mV reference threshold. |
| Peak Switch Current Limit | 4A typical; provides headroom above 3A continuous rating for transient load surges in LED flash applications. |
| Feedback Threshold | 700mV ±21mV; low reference improves efficiency in high-VF white LED strings by reducing divider losses. |
| Efficiency | Up to 95% at 5V→12V/1A; achieved via low RDS(on) 150mΩ internal MOSFET and synchronous rectification compatibility. |
| Thermal Shutdown | 160°C junction temperature; protects device during sustained overload or poor PCB thermal design. |
| Open-Load Threshold | 27V at OLS pin; prevents uncontrolled VOUT rise in disconnected LED string or open-circuit fault conditions. |
Pinout & Package
The MP1517DR-LF-P is housed in a thermally enhanced 4mm × 4mm QFN16 package with exposed thermal pad (connected to PGND pins 11 & 12). Pin 1 is marked by a dot or beveled corner; exposed pad must be soldered to PCB ground plane for optimal thermal performance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Error amplifier output | Connects to RC compensation network; sets loop stability poles/zeros for wide operating condition coverage. |
| 3 BP | Internal LDO output | 2.4V supply for internal circuitry; requires ≥10nF bypass capacitor to SGND; no external loading permitted. |
| 4 EN | Enable control input | Logic-high (>1.5V) enables regulator; logic-low (<0.4V) enters <1µA shutdown mode; must not float. |
| 5,13 SGND | Signal ground reference | Reference for FB, SS, EN, OLS; separate from power ground to minimize noise coupling into feedback path. |
| 7 OLS | Open-load sense input | Monitors output voltage; disables SW when >27V and initiates soft-start restart on recovery. |
| 8 IN | Main power input | Supplies internal LDO (BP) and switch driver; accepts 2.6V–25V; supports bootstrapped operation. |
| 9,10 SW | Switch node | Drain of internal 150mΩ N-MOSFET; connects to inductor and Schottky diode anode in boost topology. |
| 11,12 PGND | Power ground return | Low-impedance return path for switch current and inductor ripple; tied to exposed thermal pad. |
| 15 SS | Soft-start timing input | Sources 2µA to external capacitor; controls startup current ramp rate and prevents input overshoot. |
| 16 FB | Feedback input | Compares divided output voltage against 700mV reference; sets regulated output voltage precisely. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ Power Switch | Reduces conduction loss and eliminates external MOSFET layout complexity in boost/SEPIC designs. |
| 0.7V Feedback Reference | Minimizes resistor-divider power loss in high-current white LED flash applications, improving system efficiency. |
| Open-Load Shutdown (OLS) | Prevents uncontrolled VOUT rise during LED string disconnection by disabling SW at 27V and auto-recovering. |
| 2µA Soft-Start Current Source | Enables precise, adjustable startup time (10–22nF capacitor yields ~2.8–6.1ms ramp) without external timers. |
| Current-Mode Control Architecture | Provides inherent cycle-by-cycle current limiting, fast transient response, and simplified loop compensation. |
| Thermally Enhanced QFN16 | 4mm × 4mm footprint with exposed pad delivers θJA = 46°C/W, enabling 3A operation without heatsink in 2-layer PCBs. |
Applications
| Cell Phone Camera Flash | Handheld Computer Boost Rail |
|---|---|
|
Use Scenario: Driving 3–6 white LEDs in burst flash mode (150mA) from 3.3V–4.2V Li-ion battery. IC Role / Device Role / Timing Role: Step-up controller regulating 12V–22V output; manages inductor current ramp via COMP and SS pins during flash pulse. Use Value: 95% efficiency at 5V→12V/1A and 0.7V FB reference reduce battery drain; OLS prevents overvoltage damage if LED string opens mid-flash. |
Use Scenario: Generating stable 5V or 12V system rail in PDAs or rugged handhelds powered by 2.6V–6V sources. IC Role / Device Role / Timing Role: Primary boost regulator supplying processor I/O, display backlight, and USB PHY; operates continuously at up to 3A. Use Value: 1.1MHz switching allows ≤4.7µH inductors and 10µF ceramic input/output caps; QFN16 package fits tight board real estate. |
| SEPIC Power Supply | Digital Camera Power Management |
|
Use Scenario: Providing regulated 3.3V output from variable 3V–4.2V battery input in battery-powered instrumentation. IC Role / Device Role / Timing Role: SEPIC controller using coupled inductor; maintains regulation even when VIN approaches or exceeds VOUT. Use Value: Internal 4A current limit and 25V rating support wide VIN/VOUT ratios; BP LDO ensures stable internal bias under input transients. |
Use Scenario: Powering CCD/CMOS image sensors and analog front-ends requiring low-noise, tightly regulated 12V/−12V rails. IC Role / Device Role / Timing Role: Dual-rail SEPIC controller generating ±12V from 5V input using transformer-coupled windings. Use Value: 1.1MHz frequency minimizes magnetic size; OLS and thermal shutdown protect sensitive imaging circuitry during fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1542DK-LF-Z | Higher 2.2MHz switching frequency; lower 2A current limit; same 0.7V FB and QFN16 package. | Better suited for ultra-compact designs needing smaller magnetics but unable to support >2A loads. | Select when board area is critical and peak load ≤2A; avoid for 3A flash or high-current boost. |
| RT8535GSP | 3A rated, 1.3MHz, 28V max output, but lacks OLS pin and uses different compensation scheme (Type II vs Type III). | Requires redesign of feedback network and fault protection circuitry; no integrated open-load detection. | Choose only if OLS functionality is unnecessary and existing RT8535 layout reuse is prioritized over fault robustness. |
Compared with MP1517DR-LF-P, MP1542DK-LF-Z trades peak current headroom for higher frequency miniaturization, while RT8535GSP omits OLS protection and demands compensation re-optimization-making MP1517DR-LF-P uniquely balanced for reliable, high-current, fault-aware boost in portable imaging systems.
Availability
MP1517DR-LF-P is available at Aetrix Electronics and suitable for cell phone camera flash modules, handheld computer power rails, digital camera dual-rail supplies, and industrial SEPIC converters requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MP1517DR-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 MP1517 belongs to MPS's high-current boost converter product line, designed specifically for portable imaging and battery-powered systems demanding compact, efficient, and fault-resilient voltage step-up with integrated protection features.
FAQ
What is the minimum input voltage required for MP1517DR-LF-P to start switching?
The MP1517DR-LF-P has an undervoltage lockout (UVLO) threshold of 2.10V (rising), with 100mV hysteresis. It begins switching only when VIN rises above 2.40V and remains enabled until VIN drops below 2.10V. This ensures stable operation across Li-ion battery discharge curves from 4.2V down to 2.6V nominal.
Can the MP1517DR-LF-P drive multiple parallel LED strings without external current regulation?
No-it regulates output voltage, not current. For multi-string white LED operation, each string requires a series current-setting resistor or external constant-current sink. The 0.7V FB reference simplifies resistor-divider design, but per-string current matching depends on LED Vf tolerance and thermal tracking.
How does the OLS (Open Load Shutdown) pin function during normal operation?
During normal operation, the OLS pin monitors output voltage via a resistive divider. When its voltage exceeds 27V, the internal comparator disables the SW pin and forces soft-start restart. To disable OLS protection entirely, tie OLS directly to SGND-this removes fault detection but retains all other protections.
What is the recommended soft-start capacitor value for a 5ms startup time?
Using the formula tSS = 0.275 × CSS (with CSS in nF), a 5ms soft-start requires CSS ≈ 18.2nF. A standard 18nF or 22nF ceramic capacitor is recommended; values between 10nF and 22nF ensure controlled inrush while maintaining stability across temperature.
Is the BP pin intended for external biasing or power supply to other circuitry?
No-the BP pin outputs a dedicated 2.4V LDO supply solely for internal MP1517 circuitry. It must be bypassed with ≥10nF to SGND but cannot source external current. Applying any load to BP risks regulation instability and is explicitly prohibited in the datasheet.
Does the MP1517DR-LF-P support synchronization to an external clock?
No-it uses a fixed internal 1.1MHz oscillator and does not provide clock sync input or frequency adjustment capability. For synchronized multi-rail systems, external timing coordination must be implemented at the system level, not via the MP1517DR-LF-P.
What is the maximum allowable output capacitance for stable operation?
Stability depends on compensation, not absolute COUT value. With standard 10nF C3 and 2.2kΩ R3, the MP1517DR-LF-P supports ≥100µF ceramic or low-ESR tantalum output capacitors. For >470µF, add a second compensation capacitor (C6) from COMP to SGND per the ESR zero calculation in the datasheet.
MP1517DR-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:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 3A (Switch)
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
MP1517DR-LF-P FAQ
1.How can I place an order for MP1517DR-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1517DR-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 MP1517DR-LF-P reliable?
The price and inventory of MP1517DR-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 MP1517DR-LF-P is usually 5 days.
3.What payment methods are accepted for MP1517DR-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1517DR-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1517DR-LF-P?
MP1517DR-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1517DR-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 MP1517DR-LF-P?
For technical support, including MP1517DR-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1517DR-LF-P requirements.
6.How does Aetrix verify that MP1517DR-LF-P is sourced from the original manufacturer or authorized distributors?
All MP1517DR-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 MP1517DR-LF-P meets industry standards.
7.What is the process for return or replacement of MP1517DR-LF-P?
All MP1517DR-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP1517DR-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 MP1517DR-LF-P part is unused and in its original packaging.
Return procedure for MP1517DR-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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