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Monolithic Power Systems Inc. MP4657AGS-Z
- Part No.:
- MP4657AGS-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP4657AGS-Z.pdf
- Description:
- SINGLE-STAGE, FLYBACK, 4-STRING
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MP4657AGS-Z from Monolithic Power Systems is a single-stage flyback LED driver and system voltage controller for secondary-side LCD backlighting, integrating 4-string LED current balancing (±2% matching), 1.5% system voltage accuracy, and independent PWM/analog dimming control via ADIMP/PWM pin with 5kHz threshold. It regulates both LED current (up to 80V per string) and 5V/3A system supply in displays using an external N-channel MOSFET and optocoupler feedback.
For engineers reviewing the MP4657AGS-Z datasheet, MP4657AGS-Z pinout, MP4657AGS-Z application, or MP4657AGS-Z equivalent, key selection criteria include its dual-loop regulation architecture, SOIC-16 package thermal performance (θJA = 80°C/W), soft-switching GATE driver (6V max swing referenced to VIN/SOURCE), and coordinated protection for LED open/short and system OVP/feedback open loop.
Technical Context
The MP4657AGS-Z implements two independent control loops: the ICOMP loop regulates LED current by modulating flyback duty cycle during active PWM dimming, while the DCOMP loop controls external MOSFET duty cycle for system voltage regulation. Its SYNC pin synchronizes GATE turn-off to primary-side flyback switch turn-on, enabling zero-current switching and reducing voltage spikes.
Dimming mode is determined by ADIMP/PWM input frequency: >5kHz enables analog dimming (continuous current amplitude control), while <5kHz enables PWM dimming (current chopping). The device features separate transconductance gains for DCOMP (680 μA/V active, 260 μA/V inactive) and clamped ICOMP/DCOMP output voltages (0.93–2.6V) to stabilize loop dynamics across operating modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage | 4V to 16V - powers IC and references GATE driver; UVLO at 3.6V ensures clean startup. |
| LED String Count | 4 strings - supports full-array local dimming in LCD TVs/monitors with individual cathode outputs (LED1–LED4). |
| LED Voltage Range | Up to 80V per string - accommodates high-Vf white LED stacks in large-panel backlighting. |
| System Voltage Accuracy | ±1.5% - tight regulation enables stable 5V/3A power delivery to display logic without post-regulation. |
| LED Current Accuracy | ±1.5% - achieved via precision ISET reference (1.58V typ) and low-drift current-sense architecture. |
| Dimming Threshold | 5kHz - cleanly separates analog (high-freq) and PWM (low-freq) dimming modes on single ADIMP/PWM pin. |
| Thermal Protection | 150°C trip with 25°C hysteresis - prevents latch-off during transient overloads while allowing recovery. |
Pinout & Package
MP4657AGS-Z is housed in a standard SOIC-16 package (5.3mm × 10mm, 1.27mm pitch) with exposed pad for thermal dissipation; θJA = 80°C/W on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SYNC | Synchronization input | Falling edge aligns GATE turn-off with primary-side switch turn-on to enable soft switching and reduce MOSFET voltage stress. |
| 2 OPT | Optocoupler output | Drives primary-side controller via optocoupler; clamps to 3.3V during system OVP to halt flyback operation. |
| 3 VFB | System voltage feedback | Monitors VSYS via resistor divider; triggers OVP if voltage exceeds 124% of 1.2V reference. |
| 4 DCOMP | System voltage compensation | Controls external MOSFET duty cycle when PWM active; gain shifts between 680 μA/V (active) and 260 μA/V (inactive). |
| 5 ICOMP | LED current compensation | Regulates flyback duty for LED current; holds voltage during PWM inactive to maintain steady-state bias. |
| 6 OVP | LED overvoltage sense | Detects >2.4V on LEDx pins to protect against open-circuit or overvoltage faults; includes 200mV hysteresis. |
| 7–8, 10–11 LED1–LED4 | LED string cathodes | Four dedicated current-sink outputs with integrated matching; each supports up to 80V reverse voltage. |
| 9 GND | Power and signal ground | Common return for all analog and power paths; requires low-impedance PCB connection to minimize noise coupling. |
| 12 ISET/FAULT | Current setting & fault flag | Resistor-to-ground sets LED current (1.58V ref); pulled low during LED open/short or thermal fault. |
| 13 ADIMP/PWM | Dimming control input | Accepts 0.7–6V logic signal; frequency determines dimming mode (analog >5kHz, PWM <5kHz). |
| 14 VIN/SOURCE | Supply input & gate reference | Powers internal circuitry; serves as reference for GATE voltage (max 6V swing above this pin). |
| 15 VDRV | Gate driver supply | Bypassed to VIN/SOURCE; enables robust 0.5A source / 1A sink GATE drive for external MOSFET. |
| 16 GATE | MOSFET gate driver | Directly drives external N-channel MOSFET; voltage limited to 6V above VIN/SOURCE to prevent gate oxide damage. |
Key Features
| Feature | Design Value |
|---|---|
| Single-stage flyback integration | Eliminates separate LED and system supply controllers, reducing BOM count and PCB area in LCD backlight designs. |
| Independent LED/system regulation | Enables simultaneous dimming of LEDs while maintaining constant 5V system rail-critical for display timing stability. |
| Soft-switching MOSFET control | GATE turn-off synchronized to primary switch turn-on reduces dv/dt stress and EMI in high-power backlight systems. |
| 4-string current balancing | ±2% matching across strings ensures uniform brightness in multi-zone local dimming architectures. |
| Comprehensive fault protection | Covers LED open/short, system OVP, feedback open loop, and thermal shutdown-reducing need for external supervision circuits. |
Applications
| LCD TV Backlight Control | Desktop Monitor Power + Dimming |
|---|---|
Use Scenario: 55-inch LCD TV with local dimming zones requiring independent LED string control and stable 5V/3A system supply for TCON and timing controller. IC Role / Device Role / Timing Role: Secondary-side flyback controller managing both LED current (via ICOMP loop) and VSYS (via DCOMP loop) with synchronized GATE switching. Use Value: Enables flicker-free analog dimming at >5kHz while maintaining ±1.5% system voltage accuracy-preserving image processing integrity. | Use Scenario: 27-inch desktop monitor with 4-string edge-lit backlight and integrated power management for display logic and USB-C PD interface. IC Role / Device Role / Timing Role: Dual-output controller delivering regulated LED current and system voltage from single flyback transformer, minimizing component count. Use Value: Reduces bill-of-materials by consolidating LED driver and system supply functions into one SOIC-16 IC with built-in protections. |
| Flat Panel Video Wall | Industrial HMI Display |
Use Scenario: Modular video wall tile with 4-string backlight and requirement for hot-plug compatibility and fault isolation across multiple tiles. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with per-string open/short detection and latched OVP to prevent cascading failures in tiled arrays. Use Value: LEDx pin short-to-ground protection and ISET/FAULT pin flagging enable rapid diagnostics and field-replaceable module design. | Use Scenario: ruggedized human-machine interface display operating in industrial environments with wide temperature range (-40°C to +125°C junction). IC Role / Device Role / Timing Role: Thermally robust controller with 150°C thermal shutdown and guaranteed operation up to 125°C ambient. Use Value: Eliminates need for external thermal monitoring; SOIC-16 package with θJA = 80°C/W supports convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver and system voltage controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP4655AGS-Z | 2-string LED support, no ISET/FAULT pin, lower LED voltage rating (60V), same SOIC-16 package. | Limited to smaller displays with fewer LED strings; lacks per-string fault reporting capability. | Select when cost-sensitive designs require only dual-string backlighting and simplified fault handling. |
| LM3409QMY/NOPB | Single-string LED controller with external MOSFET gate driver; no integrated system voltage regulation or optocoupler interface. | Requires separate system supply IC and primary-side feedback circuitry-increasing complexity and footprint. | Choose for automotive or high-reliability applications where TI's AEC-Q100 qualification and robust ESD (±8kV HBM) are mandatory. |
Compared with MP4655AGS-Z and LM3409QMY/NOPB, the MP4657AGS-Z uniquely integrates 4-string balancing, dual-loop regulation, and optocoupler-based primary control in one SOIC-16 device-reducing total solution size by ~30% and eliminating inter-stage communication latency in LCD backlight systems.
Availability
MP4657AGS-Z is available at Aetrix Electronics and suitable for LCD monitors and TVs, desktop flat panel displays, and flat panel video displays requiring stable component supply, consistent thermal performance, and long-term production continuity.
Supply support for MP4657AGS-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 power management ICs, with over 20 years of expertise in DC/DC converters, LED drivers, and motor drivers.
The MP4657A belongs to MPS's secondary-side LED backlight controller product line, designed specifically to simplify high-efficiency, multi-string LCD backlight architectures while meeting stringent EMI and thermal requirements in consumer and industrial displays.
FAQ
What dimming methods does MP4657AGS-Z support and how are they selected?
The MP4657AGS-Z supports both analog and PWM dimming through the ADIMP/PWM pin. Applying a signal >5kHz selects analog dimming (continuous current amplitude control), while <5kHz selects PWM dimming (current chopping). The 5kHz threshold is internally fixed and not programmable; no external configuration is required to switch modes.
How does the MP4657AGS-Z achieve soft switching for the external MOSFET?
Soft switching is achieved by synchronizing the GATE signal's falling edge to the primary-side flyback switch's rising edge via the SYNC pin. This ensures the external N-channel MOSFET turns off when secondary winding current approaches zero, minimizing voltage spikes and reducing switching losses without requiring auxiliary snubbers.
What protections are implemented for the LED driver stage?
The LED driver stage includes LED open protection (detects >100mV on LEDx pins), LED short protection (fast/slow thresholds at 20V and 4.9V), and LEDx pin short-to-ground protection. All faults pull the ISET/FAULT pin low and latch off the IC if OVP pin exceeds 3V, ensuring fail-safe operation.
Can MP4657AGS-Z regulate system voltage without active LED current control?
Yes. When the PWM signal is inactive, the MP4657AGS-Z disables the LED current loop and regulates system voltage solely through the flyback power stage, with the external MOSFET held fully on. The DCOMP loop remains active but operates with reduced gain (260 μA/V vs. 680 μA/V) to maintain stable VSYS regulation.
What is the maximum LED string voltage the MP4657AGS-Z can handle per channel?
The MP4657AGS-Z supports up to 80V per LED string, as confirmed by absolute maximum rating for LEDx pins (-0.3V to +80V) and typical application data showing operation at 44V per string with 150mA current. This enables use with high-Vf white LED stacks in large-format displays.
Is the MP4657AGS-Z RoHS-compliant and halogen-free?
Yes. Per MPS documentation, all MP4657A variants-including MP4657AGS-Z-are lead-free, halogen-free, and fully compliant with the EU RoHS directive. Green status verification is available on the MPS Quality Assurance webpage.
How is LED current set and what tolerance can be expected?
LED current is set by connecting a resistor from ISET/FAULT to GND; the internal 1.58V (typ) reference yields ILED = 1.58V / RISET. At 50mA nominal, current accuracy is ±1.5% over temperature and line, with ±2% matching across all four strings-verified in electrical characteristics tables and typical performance curves.
MP4657AGS-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback
- Internal Switch(s):
- No
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 20kHz ~ 350kHz
- Dimming:
- Analog, PWM
- Applications:
- LCD TV/Monitor, Flat Panel Display
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP4657AGS-Z FAQ
1.How can I place an order for MP4657AGS-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4657AGS-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 MP4657AGS-Z reliable?
The price and inventory of MP4657AGS-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4657AGS-Z is usually 5 days.
3.What payment methods are accepted for MP4657AGS-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4657AGS-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4657AGS-Z?
MP4657AGS-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4657AGS-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 MP4657AGS-Z?
For technical support, including MP4657AGS-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4657AGS-Z requirements.
6.How does Aetrix verify that MP4657AGS-Z is sourced from the original manufacturer or authorized distributors?
All MP4657AGS-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 MP4657AGS-Z meets industry standards.
7.What is the process for return or replacement of MP4657AGS-Z?
All MP4657AGS-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4657AGS-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 MP4657AGS-Z part is unused and in its original packaging.
Return procedure for MP4657AGS-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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