My Inquiry
My Account
Monolithic Power Systems Inc. MP1517DR-LF-Z
- Part No.:
- MP1517DR-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MP1517DR-LF-Z.pdf
- Description:
- IC REG BST FLYBACK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,894
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP1517DR-LF-Z from Monolithic Power Systems is a 3A, 25V, 1.1MHz fixed-frequency current-mode step-up DC/DC converter in a thermally enhanced QFN16 (4mm × 4mm) package. It integrates a 150mΩ N-channel MOSFET switch, features a 700mV feedback threshold for high-efficiency white LED camera flash regulation, and delivers up to 95% efficiency in boost and SEPIC topologies for handheld imaging systems.
For engineers reviewing the MP1517DR-LF-Z datasheet, MP1517DR-LF-Z pinout, MP1517DR-LF-Z application, or MP1517DR-LF-Z equivalent, key selection considerations include its 2.6V–25V input range, open-load shutdown at 27V, soft-start with external capacitor control, thermal shutdown at 160°C, and internal 2.4V LDO (BP pin) for biasing.
Technical Context
The MP1517DR-LF-Z employs fixed-frequency (1.1MHz typ.) current-mode PWM control with cycle-by-cycle current limiting and an error amplifier featuring 400 V/V gain and 350 µA/V transconductance. Its internal 150mΩ power switch and 700mV reference enable precise output regulation across wide VIN (2.6V–25V), VOUT (3.3V–25V), and load ranges.
It integrates dedicated protection circuitry: input UVLO (2.4V rising threshold with 100mV hysteresis), open-load detection via OLS pin (27V threshold), thermal shutdown (160°C), and zero-current shutdown mode. Compensation is externally configurable via COMP pin using RC networks to stabilize loops under varying COUT ESR and RLOAD conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.1 MHz typical - enables use of compact 2.2–4.7µH inductors and ceramic capacitors in space-constrained portable designs. |
| Input Voltage Range | 2.6V to 25V - supports single-cell Li-ion (2.6V min after discharge) through multi-cell or adapter inputs without external pre-regulation. |
| Output Voltage Range | 3.3V to 25V - programmable via resistive divider; suitable for white LED strings (12–18V), flash drivers, and industrial bias rails. |
| Feedback Threshold | 700 mV ±21 mV - low reference minimizes resistor-divider power loss and improves efficiency in LED current-sense configurations. |
| Peak Switch Current Limit | 4.0 A maximum - provides robust overcurrent protection while supporting ≥3A continuous output in boost mode with margin. |
| Internal MOSFET RDS(on) | 150 mΩ at VIN = 5V - reduces conduction loss and thermal stress, enabling >90% efficiency at 500mA–2A loads. |
| Soft-Start Current | 2 µA sourcing into SS pin - allows precise control of startup inrush (e.g., 10nF → ~2.75ms soft-start time) to prevent input rail collapse. |
| Open-Load Shutdown Threshold | 27 V at OLS pin - protects against uncontrolled VOUT rise during LED string disconnect, auto-recovering via soft-start upon fault clearance. |
Pinout & Package
MP1517DR-LF-Z is housed in a thermally enhanced 4mm × 4mm QFN16 package with exposed thermal pad (Pin 13 connected to PGND). The package supports high-power density layouts with low θJA = 46°C/W on 1"² 1oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Error amplifier output | Connects to external RC compensation network; sets loop stability, phase margin, and transient response for varied output capacitance and load. |
| 3 BP | Internal 2.4V LDO output | Bypassed with ≥10nF to SGND; powers internal circuitry-no external loading permitted to avoid regulation failure. |
| 4 EN | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.4V) enters 1µA shutdown-must not float; supports system-level power sequencing. |
| 5,13 SGND | Signal ground reference | Reference for FB, SS, EN, COMP; separate from PGND to minimize noise coupling into feedback path. |
| 7 OLS | Open-load sense input | Monitors VOUT via resistive divider; triggers shutdown when voltage exceeds 27V-critical for LED flash safety compliance. |
| 8 IN | Main input supply | Accepts 2.6V–25V; also supports bootstrapped operation when tied to VOUT in certain SEPIC configurations. |
| 9,10 SW | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky rectifier-requires short, low-inductance layout to minimize EMI and ringing. |
| 11,12 PGND | Power ground return | High-current return path for SW and internal MOSFET; must be tied directly to exposed thermal pad for optimal thermal performance. |
| 15 SS | Soft-start timing input | Sourced with 2µA during startup; voltage ramp controls COMP clamping to limit inrush-capacitor value sets soft-start duration. |
| 16 FB | Feedback input | Compares output voltage (via resistor divider) to 700mV reference; determines regulation setpoint and load transient accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ N-channel MOSFET | Eliminates need for external high-side switch, reducing BOM count and PCB area while maintaining ≥92% efficiency at 1A output. |
| 700mV precision feedback reference | Enables accurate current regulation in LED driver applications with minimal divider resistor power loss and improved thermal stability. |
| Open-load shutdown with 27V threshold | Prevents destructive overvoltage during LED string disconnection-auto-recovers via soft-start without requiring external fault latching. |
| Thermal shutdown at 160°C | Protects device under sustained overload or poor heatsinking; resumes operation only after junction cools below hysteresis threshold. |
| Current-mode PWM with 1.1MHz fixed frequency | Provides fast transient response and stable loop behavior across wide input/output/load variations-simplifies EMI filter design. |
| Internal 2.4V LDO (BP pin) | Supplies clean bias to internal circuitry independent of input ripple-ensures reliable operation even with noisy or sagging input sources. |
Applications
| Cell Phone Camera Flash | Handheld Digital Camera Power |
|---|---|
|
Use Scenario: Driving 3–6 white LEDs in burst flash mode (150mA peak) from a 3.3V–4.2V Li-ion battery. IC Role / Device Role / Timing Role: Step-up controller regulating constant-current LED output via FB-sensed current sense resistor; soft-start prevents input droop during flash trigger. Use Value: 700mV FB threshold enables <1% current regulation error; 4A current limit supports safe 150mA×4-string operation; OLS pin prevents overvoltage if LED string opens mid-flash. |
Use Scenario: Generating 12V/200mA bias for CCD/CMOS image sensor and analog front-end from a 5V USB or battery source. IC Role / Device Role / Timing Role: Fixed-frequency boost converter operating in continuous conduction mode; COMP compensation optimized for 100µF ceramic + polymer output cap. Use Value: 1.1MHz switching allows use of 2.2µH shielded inductor; 95% peak efficiency extends battery runtime; thermal shutdown protects sensor interface during extended capture sessions. |
| PDAs & Portable Media Players | Industrial Handheld Scanners |
|
Use Scenario: Providing 18V for OLED display backlight and 5V auxiliary rail via SEPIC topology from 3.0V–4.2V battery input. IC Role / Device Role / Timing Role: SEPIC regulator with coupled inductor; OLS monitors combined output; EN enables system-level power management. Use Value: Input range accommodates full battery discharge curve; open-load protection avoids damage during display cable disconnect; 16-pin QFN fits tight board real estate. |
Use Scenario: Powering 24V laser diode driver and 5V logic from 12V vehicle battery with transient tolerance. IC Role / Device Role / Timing Role: Boost converter with UVLO (2.4V) and thermal shutdown-operates reliably across automotive cold-crank (6V) to load-dump (30V) conditions. Use Value: 25V absolute max rating and 27V OLS threshold provide margin against load-dump spikes; 46°C/W θJA enables convection-only cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5A current limit, 2.7V–12V input, integrated 13mΩ FET, but no OLS pin or BP LDO. | Lacks open-load protection and internal bias LDO-requires external supervision circuitry for LED safety-critical flash use. | Select when higher peak current and lower RDS(on) outweigh need for autonomous OLS fault handling. |
| LT3467EDD | 2.5A limit, 2.7V–16V input, 1.2MHz switching, includes true shutdown (IQ < 1µA), but no integrated LDO or OLS. | No open-load detection or internal 2.4V bias rail-requires external voltage monitor and LDO for comparable functionality. | Choose for ultra-low quiescent current in always-on portable devices where OLS is managed externally. |
Compared with TPS61088RHLR and LT3467EDD, MP1517DR-LF-Z uniquely integrates OLS-based open-load shutdown and a dedicated BP LDO-reducing external component count and improving functional safety in LED flash and industrial sensor bias applications without sacrificing 1.1MHz switching speed or thermal performance.
Availability
MP1517DR-LF-Z is available at Aetrix Electronics and suitable for cell phone camera flash modules, handheld digital camera power supplies, and industrial handheld scanner bias rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP1517DR-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, motor drivers, and LED lighting controllers.
The MP1517 belongs to MPS's high-current boost converter product line, designed specifically for portable imaging and battery-powered systems demanding compact size, high efficiency, and integrated protection-especially where LED flash safety and input voltage flexibility are critical.
FAQ
What is the minimum input voltage required for MP1517DR-LF-Z to start switching?
The MP1517DR-LF-Z has an undervoltage lockout (UVLO) threshold of 2.40V (rising), with 100mV hysteresis. It will not initiate switching until VIN rises above 2.40V, and remains enabled down to 2.30V. This ensures reliable startup from partially discharged Li-ion cells (≥2.6V typical operating minimum).
Can the MP1517DR-LF-Z drive multiple parallel LED strings without external current balancing?
No-it regulates output voltage, not current. For multi-string LED operation, each string requires a series current-setting resistor or external current sink. The 700mV FB threshold enables precise resistor-based current control (e.g., 20mA per string with 35Ω), but mismatched forward voltages will cause current imbalance without per-string regulation.
How does the OLS pin function in a SEPIC configuration?
In SEPIC topologies, the OLS pin must be connected to the final regulated output (VOUT), not the intermediate coupling capacitor node. It monitors VOUT directly; if that voltage exceeds 27V due to open load or regulation fault, the IC disables switching and auto-restarts via soft-start-preserving safety regardless of topology.
What is the recommended layout practice for the PGND and SGND connections?
PGND (Pins 11,12) and SGND (Pins 5,13) must be separated on the PCB except at a single point near the IC's exposed thermal pad (Pin 13). PGND carries high di/dt switch currents and must route directly to the inductor and output capacitor; SGND serves low-noise analog functions (FB, SS, EN) and must avoid PGND current paths to prevent feedback corruption.
Does the MP1517DR-LF-Z support synchronization to an external clock?
No-the MP1517DR-LF-Z uses a fixed internal oscillator at 1.1MHz and does not provide an external sync input. Its frequency varies ±20% over temperature and supply (0.9–1.3MHz), so it is unsuitable for noise-sensitive applications requiring deterministic switching or EMI spreading.
What is the maximum allowable output capacitance for stable operation?
Stability depends on compensation, not absolute COUT value. With standard 10nF/2.2kΩ compensation (C3/R3), the MP1517DR-LF-Z supports ≥100µF ceramic or low-ESR electrolytic output caps. For >470µF, add a second compensation capacitor (C6) from COMP to SGND to counteract ESR zero effects-details are in the datasheet's compensation section.
Is the exposed thermal pad (Pin 13) electrically connected to any internal node?
Yes-the exposed pad is internally connected to PGND and must be soldered to a solid copper thermal plane tied to Pin 11 and Pin 12. It is not isolated; omitting this connection degrades thermal performance by >30°C and risks thermal shutdown under load.
MP1517DR-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:
- 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-Z FAQ
1.How can I place an order for MP1517DR-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1517DR-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 MP1517DR-LF-Z reliable?
The price and inventory of MP1517DR-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 MP1517DR-LF-Z is usually 5 days.
3.What payment methods are accepted for MP1517DR-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1517DR-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1517DR-LF-Z?
MP1517DR-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1517DR-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 MP1517DR-LF-Z?
For technical support, including MP1517DR-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1517DR-LF-Z requirements.
6.How does Aetrix verify that MP1517DR-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP1517DR-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 MP1517DR-LF-Z meets industry standards.
7.What is the process for return or replacement of MP1517DR-LF-Z?
All MP1517DR-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1517DR-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 MP1517DR-LF-Z part is unused and in its original packaging.
Return procedure for MP1517DR-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP1517DR-LF-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
