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Monolithic Power Systems Inc. MP4700GS-P
- Part No.:
- MP4700GS-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP4700GS-P.pdf
- Description:
- LOW SIDE BCM MODE BUCK CONTROLLE
- Quantity:
- Payment:
- Shipping:
Inventory:2,509
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Product details
Overview
MP4700GS-P from Monolithic Power Systems is a high-efficiency, boundary conduction mode (BCM), low-side buck white LED driver IC that regulates constant LED current via external MOSFET control. It operates from 8V–18V input, features 302mV CS reference voltage, 160kHz max switching frequency, and PWM dimming support for precise brightness control in TV backlighting and industrial lighting systems.
For engineers reviewing the MP4700GS-P datasheet, MP4700GS-P pinout, MP4700GS-P application, or MP4700GS-P equivalent, this device is selected for high-brightness LED systems requiring zero-current turn-on, hiccup short-circuit protection, UVLO on both bus and VCC rails, thermal shutdown, and minimal inductor sizing due to BCM operation.
Technical Context
The MP4700GS-P implements peak-current-controlled boundary conduction mode using valley-voltage detection at the DRV pin to achieve zero-current turn-on of the external MOSFET-eliminating freewheeling diode reverse recovery loss and reducing EMI. Its internal LDO supplies VCC at 8.4V (VIN < 12V) or switches to current-source regulation (9.0V–9.8V) above 12V to improve efficiency.
Current regulation relies on sensing MOSFET peak current through an external resistor at the CS pin with a tightly specified 285–315mV reference at 25°C. Protection includes hiccup-mode output short detection (2.8ms shutdown/retry), dual UVLO (INUV pin threshold = 1.2V, VCC UVLO = 7.4V rising), and thermal shutdown at 150°C with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 18V DC - supports wide-range DC bus inputs typical in AC/DC flyback-derived LED systems. |
| CS Reference Voltage | 285–315mV at 25°C - enables accurate ±1% LED current regulation with low-power sense resistor. |
| Max Switching Frequency | 160kHz - limits core losses and EMI while ensuring stable BCM operation across line/load variations. |
| VCC Regulation | 8.4V (LDO mode, VIN < 12V); 9.0–9.8V (current-source mode, VIN > 12V) - reduces quiescent power and improves system efficiency. |
| PWM Dimming Range | 100Hz–2kHz - provides flicker-free brightness control compatible with standard microcontroller PWM outputs. |
| Thermal Shutdown Threshold | 150°C with 30°C hysteresis - prevents permanent die damage during sustained overload or poor heatsinking. |
| Output Short Protection | Hiccup mode with 2.8ms shutdown interval - avoids thermal runaway while enabling automatic recovery after fault clearance. |
Pinout & Package
MP4700GS-P is housed in an SOIC-8 package (5.0mm × 6.2mm, 1.27mm pitch) with exposed pad not electrically connected. The package supports standard reflow profiles and delivers θJA = 96°C/W on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 INUV | Bus Input UVLO Sense | Monitors scaled-down bus voltage via external divider; triggers lockout if bus drops below 1.2V threshold. |
| 2 PWM | PWM Dimming Control Input | High-level (>1.5V) enables switching; low-level (<0.75V) disables output; open or pulled high disables dimming. |
| 3 GND | Analog Ground Reference | Return path for CS, INUV, and internal logic; must be separated from power ground per layout guidelines. |
| 4 VIN | Main Power Input | Supplies internal LDO and gate driver; accepts 8–18V DC with absolute max 20V. |
| 5 VCC | Internal Regulated Supply | Provides 8.4V (or 9.0–9.8V) bias for IC logic and gate drive; requires local 1µF ceramic bypass capacitor. |
| 6 TST | Test Pin | Must be tied to GND for normal operation; floating or driven may cause undefined behavior. |
| 7 DRV | External MOSFET Gate Driver Output | Drives N-channel MOSFET gate with 550mA source / 1.2A sink; also detects zero-current crossing via dv/dt sensing. |
| 8 CS | Current Sense Input | Measures peak MOSFET current via external resistor; 302mV nominal threshold sets LED current as ILED = 302mV / (2 × Rsense). |
Key Features
| Feature | Design Value |
|---|---|
| Boundary Conduction Mode (BCM) Control | Enables zero-current turn-on and eliminates diode reverse recovery loss - improves efficiency by up to 3% vs. CCM and allows smaller magnetics. |
| Low 302mV Current Sense Threshold | Reduces I²R loss in sense resistor by >70% vs. 1V references - critical for high-current LED strings where power dissipation matters. |
| Integrated Bus & VCC UVLO | Dual independent UVLO circuits prevent operation under unsafe input conditions - INUV protects against low bus voltage; VCC UVLO guards against insufficient internal supply. |
| DRV Pin Zero-Current Detection | Uses MOSFET drain dv/dt via Miller capacitance to detect valley voltage - no auxiliary winding or extra components required for accurate timing. |
| Hiccup-Mode Short-Circuit Protection | Shuts down for 2.8ms then retries - prevents thermal damage during LED string shorts while maintaining reliability in intermittent fault scenarios. |
Applications
| TV LED Backlighting | Industrial LED Lighting |
|---|---|
|
Use Scenario: High-voltage (210–280V) single-string LED backlight for 4K LCD TVs powered by flyback-derived DC bus. IC Role / Device Role / Timing Role: Low-side buck controller regulating 250mA LED current in BCM; synchronizes MOSFET turn-on with inductor current zero-crossing. Use Value: Achieves >97% efficiency at full load and eliminates audible coil whine via controlled valley switching - essential for premium display performance. |
Use Scenario: Constant-current driver for high-lumen industrial luminaires operating from 12–24V DC or rectified AC bus. IC Role / Device Role / Timing Role: Primary LED current regulator with hiccup protection and thermal shutdown - ensures safe operation in enclosed, high-ambient-temperature fixtures. Use Value: Enables compact design with 1.3mH inductor and 400V MOSFET - reduces BOM cost and board area vs. isolated solutions. |
| Automotive Interior Lighting | Commercial Display Backlighting |
|
Use Scenario: Decorative ambient lighting and dashboard backlighting in 12V automotive systems with wide input transients. IC Role / Device Role / Timing Role: LED driver with dual UVLO (bus + VCC) and 150°C thermal cutoff - withstands cold-crank (6V) and load-dump (36V) events when paired with proper front-end protection. Use Value: Maintains consistent brightness over temperature (-40°C to +125°C junction) without analog compensation - simplifies thermal design. |
Use Scenario: Edge-lit signage and digital kiosks requiring uniform brightness and smooth PWM dimming down to 0.1% duty cycle. IC Role / Device Role / Timing Role: PWM-dimming interface with 230–350ns OFF propagation delay - ensures tight dimming linearity and eliminates visible stepping at low brightness. Use Value: Supports 100Hz–2kHz PWM without current overshoot or undershoot - meets IEC 62471 photobiological safety requirements for flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4425HG-A | Integrated 120V MOSFET; fixed 1.2MHz frequency; no external DRV pin; requires different inductor sizing. | Better suited for lower-voltage (<60V) LED strings; lacks bus UVLO and valley detection - less optimal for high-bus industrial designs. | Select when board space is constrained and bus voltage ≤60V; avoid for 200+V applications requiring BCM optimization. |
| LM3409HV | Adjustable 100–1000kHz frequency; higher 200mV CS threshold; no integrated bus UVLO; analog dimming only. | Requires external PWM-to-analog converter for dimming; lacks hiccup protection and thermal hysteresis spec. | Choose for legacy designs needing analog dimming compatibility; not recommended where robust short-circuit recovery is required. |
Compared with MPQ4425HG-A and LM3409HV, the MP4700GS-P uniquely combines bus UVLO, valley-sensing BCM control, hiccup protection, and low 302mV CS threshold - making it the preferred choice for high-reliability, high-bus-voltage LED systems demanding minimal passive component count and predictable thermal behavior.
Availability
MP4700GS-P is available at Aetrix Electronics and suitable for TV backlighting, industrial LED luminaires, automotive interior lighting, and commercial display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for MP4700GS-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP4700 product line was designed specifically for high-efficiency, high-voltage LED driver applications requiring boundary conduction mode operation, integrated protection, and minimal external component count in space-constrained systems.
FAQ
What is the minimum recommended current sense resistor value for MP4700GS-P?
The minimum Rsense is determined by peak MOSFET current and CS pin voltage range. With 315mV max VREF and typical peak current ≈2×ILED, a 250mA LED string requires ≥600mΩ. Using lower values risks exceeding CS pin's –0.3V to +6.5V rating during transient overcurrent events.
Can MP4700GS-P operate with a 24V input supply?
No - the absolute maximum VIN rating is 20V. Applying 24V exceeds specification and risks permanent damage. For 24V systems, use an upstream buck pre-regulator to step down to ≤18V, or select a higher-voltage alternative like MPQ4425HG-A (120V rated).
How does the INUV pin UVLO function differ from the VCC UVLO?
INUV monitors the LED bus voltage (e.g., 280V flyback output) via a resistive divider to protect against undervoltage at the power stage input. VCC UVLO safeguards internal circuitry by disabling operation if the regulated 8.4V supply drops below 6.4V - two independent protections addressing different failure modes.
Is a capacitor required between DRV and source for zero-current detection?
Yes - a 10pF capacitor between the external MOSFET's drain and source improves dv/dt signal integrity for reliable valley detection. Omitting it may cause premature or missed turn-on, leading to increased switching loss or instability in BCM operation.
Does MP4700GS-P support analog dimming in addition to PWM?
No - the MP4700GS-P supports PWM dimming only. Analog dimming would require varying the CS reference voltage, which is internally fixed. For analog dimming, consider MPS's MP4425 or TI's TLC59116, but note these lack BCM-specific optimizations.
What is the purpose of the TST pin, and how should it be connected?
The TST pin is a factory test function and must be hard-connected to GND in all production designs. Leaving it floating or applying voltage may disrupt internal biasing, causing erratic gate drive timing or failure to start - confirmed in MPS application note AN-44.
How does the MP4700GS-P handle startup into a shorted LED string?
During output short, the controller detects loss of regulation via extended off-time (>2.8ms) and enters hiccup mode: shuts down for 2.8ms, then retries. This prevents thermal runaway while allowing automatic recovery once the short is removed - verified in Figure 17 of the datasheet.
MP4700GS-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 8V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 160kHz
- Dimming:
- PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP4700GS-P FAQ
1.How can I place an order for MP4700GS-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4700GS-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 MP4700GS-P reliable?
The price and inventory of MP4700GS-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4700GS-P is usually 5 days.
3.What payment methods are accepted for MP4700GS-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4700GS-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4700GS-P?
MP4700GS-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4700GS-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 MP4700GS-P?
For technical support, including MP4700GS-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4700GS-P requirements.
6.How does Aetrix verify that MP4700GS-P is sourced from the original manufacturer or authorized distributors?
All MP4700GS-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 MP4700GS-P meets industry standards.
7.What is the process for return or replacement of MP4700GS-P?
All MP4700GS-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4700GS-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 MP4700GS-P part is unused and in its original packaging.
Return procedure for MP4700GS-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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