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Monolithic Power Systems Inc. MP4689AGN-Z
- Part No.:
- MP4689AGN-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP4689AGN-Z.pdf
- Description:
- IC LED DRIVER RGLTR PWM 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,718
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Product details
Overview
MP4689AGN-Z from Monolithic Power Systems is a 100V-input, 1A constant-current LED driver IC with integrated high-side MOSFET (RDS(ON) = 500 mΩ), hysteresis current-mode control, ±3% LED current accuracy, and 20 kHz PWM dimming capability. It operates across 4.5–95 V input, delivers up to 95% efficiency, and targets high-power LED lighting in automotive headlamps and industrial area lighting.
For engineers reviewing the MP4689AGN-Z datasheet, MP4689AGN-Z pinout, MP4689AGN-Z application, or MP4689AGN-Z equivalent, key selection criteria include its 200 mV feedback reference voltage, 170 µA quiescent current for battery operation, thermal shutdown at 150°C, SOIC-8 EP package with exposed pad, and dedicated DIM/EN logic-level control inputs.
Technical Context
The MP4689AGN-Z implements hysteresis current-mode control with adaptive 185 mV/215 mV FB thresholds-enabling fast transient response without external compensation. Its internal high-side MOSFET switches up to 1 MHz, supporting compact magnetics and low EMI in buck topology LED drivers.
It integrates short-circuit protection triggered by FB < 185 mV for >10 µs, plus overcurrent shutdown at 3.5 A peak switch current. The bootstrap regulator maintains ~5 V on BST-SW to drive the floating gate, with UVLO (4.0 V rising / 3.65 V falling) and thermal shutdown (150°C trip, 130°C hysteresis) ensuring robust fault tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 95 V - supports wide-range DC supplies including 12 V/24 V/48 V automotive and industrial rails. |
| LED Output Current | Up to 1 A constant current - set via external sense resistor; regulated to ±3% accuracy at 200 mV FB reference. |
| Switching Frequency | Up to 1 MHz - enables use of small 47 µH inductors and reduces board footprint. |
| PWM Dimming Frequency | Up to 20 kHz - eliminates audible noise while enabling precise brightness control. |
| Quiescent Current | 170 µA - enables direct integration into battery-backed lighting systems with minimal standby drain. |
| Thermal Shutdown | 150°C junction temperature - protects against thermal runaway; recovers automatically after cooldown. |
| Package | SOIC-8 with exposed pad - provides 10°C/W θJC for efficient heat transfer to PCB ground plane. |
Pinout & Package
MP4689AGN-Z is housed in an SOIC-8 EP (exposed pad) package. The exposed pad must be soldered to a thermally optimized GND plane using ≥9 thermal vias (15 mil barrel, 40 mil pitch) for reliable 2.5 W power dissipation at +25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Current-sense feedback input | Regulates LED current by comparing sensed voltage across RFB to 185–215 mV hysteresis window; no compensation required. |
| 2 NC | No connection | Unbonded die pad; must remain unconnected and unrouted. |
| 3 VIN | Main power input | Supplies internal control circuitry, BST regulator, and high-side switch; requires local 10 µF low-ESR ceramic decoupling. |
| 4 BST | Bootstrap supply node | Charged to ~5 V relative to SW; powers floating gate driver; requires 0.1 µF ceramic capacitor between BST and SW. |
| 5 SW | Switch node | Drives external Schottky rectifier; high di/dt node requiring shortest possible trace to catch diode and GND. |
| 6 DIM | PWM dimming control | Logic-level input (0.8–1.5 V threshold); supports 20 kHz dimming; propagation delay ≤50 ns. |
| 7 EN | Enable control | Positive-enable input (1.38–1.78 V threshold); internal 1 µA pull-up allows floating-enable operation. |
| 8 GND / Exposed Pad | Power and signal ground | Primary thermal path; must connect exposed pad directly to solid GND plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic current-mode control | Eliminates need for external compensation network and enables stable operation with wide input/output ratios. |
| Integrated high-side MOSFET | 500 mΩ RDS(ON) at VBST–VSW = 5 V - reduces BOM count and improves efficiency vs. external FET solutions. |
| Dedicated DIM and EN pins | Independent logic-level control with sub-50 ns propagation delays - enables precise timing synchronization in multi-channel LED systems. |
| No output capacitor required | Accepts 15% peak-to-peak LED current ripple inherently - simplifies layout and lowers cost in space-constrained lighting modules. |
| Short-circuit and thermal protection | Auto-retry SCP (10 µs fault detection) and 150°C thermal shutdown with 20°C hysteresis - ensures safe operation under fault conditions. |
Applications
| Automotive Headlamp Drivers | Industrial High-Bay Lighting |
|---|---|
|
Use Scenario: Driving 1–3 high-brightness white LEDs (36–60 V total VF) from 12 V or 24 V vehicle battery with load-dump immunity. IC Role / Device Role / Timing Role: Constant-current buck controller regulating LED string current at 700 mA with 20 kHz PWM dimming synchronized to CAN bus commands. Use Value: 170 µA quiescent current prevents battery drain during vehicle sleep mode; 100 V input rating withstands ISO 7637-2 pulse 5a transients. |
Use Scenario: Powering 10–20 W LED modules in warehouse ceiling fixtures powered from 48 V DC microgrids. IC Role / Device Role / Timing Role: Primary LED current regulator with analog dimming via 0–10 V interface and digital override via DIM pin. Use Value: SOIC-8 EP package enables conduction-cooled mounting on aluminum heatsink; 95% efficiency minimizes thermal load in enclosed fixtures. |
| Emergency Exit Sign Illumination | UV-C Sterilization Modules |
|
Use Scenario: Battery-backed LED driver for FAA-compliant exit signs requiring >90 min runtime on 3.7 V Li-ion with 100% duty cycle. IC Role / Device Role / Timing Role: Low-IQ constant-current source enabling direct step-down from 3.7–4.2 V battery to 1 A LED load without intermediate boost stage. Use Value: 170 µA IQ extends battery life; ±3% current accuracy ensures consistent luminance across unit lifetime. |
Use Scenario: Driving high-voltage UV-C LEDs (≈30 V VF) in portable disinfection wands powered from 100 V DC bus derived from AC/DC converter. IC Role / Device Role / Timing Role: Isolated-output LED driver with fast transient response to enable pulsed UV emission (100 ms ON / 500 ms OFF). Use Value: Hysteresis control achieves <100 ns FB-to-SW delay - critical for precise pulse-width control of germicidal irradiance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3474EFE#PBF | Requires external N-channel MOSFET; 60 V max input; 1.25 V FB reference; needs compensation network. | Lacks integrated switch and hysteresis control - less suitable for ultra-compact or high-EMI-sensitive designs. | Choose when higher input voltage (>60 V) is not required and design flexibility with discrete FET is preferred. |
| TPS92692QPWPRQ1 | Automotive-grade; 65 V max input; 100 mV FB reference; integrated op-amp for analog dimming; requires external FET. | Qualified to AEC-Q100 Grade 1; includes diagnostic flags and spread-spectrum switching - better for ASIL-B systems. | Choose for automotive front-lighting where functional safety compliance and diagnostics are mandatory. |
Compared with LT3474EFE#PBF and TPS92692QPWPRQ1, MP4689AGN-Z offers highest input voltage range (95 V), lowest component count (integrated MOSFET + no compensation), and smallest solution size - ideal for cost- and space-constrained non-automotive industrial LED systems.
Availability
MP4689AGN-Z is available at Aetrix Electronics and suitable for automotive headlamp drivers, industrial high-bay lighting, and emergency exit sign illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MP4689AGN-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 over 20 years of leadership in DC/DC conversion, LED drivers, and motor control solutions.
The MP4689A belongs to MPS's high-voltage LED driver product line, engineered specifically for ruggedized constant-current regulation in automotive, industrial, and outdoor lighting where input transients, thermal stress, and board space are critical constraints.
FAQ
What is the minimum input voltage required for MP4689AGN-Z to start switching?
The MP4689AGN-Z features an under-voltage lockout (UVLO) with a rising threshold of 4.0 V and hysteresis of 0.4 V. It begins switching only when VIN rises above 4.0 V and remains enabled down to 3.6 V. Below 3.6 V, the device shuts down completely with 2 µA shutdown current.
Can MP4689AGN-Z drive multiple parallel LED strings?
No - MP4689AGN-Z regulates current through a single sense resistor (RFB) tied to one LED string. Driving parallel strings would cause current imbalance due to VF mismatch. For multi-string operation, separate MP4689AGN-Z units per string or a current-mirror-based architecture is required.
Is an external bootstrap diode necessary for reliable operation?
An external bootstrap diode (e.g., BAT54) is optional but recommended when VIN ≤ 5 V, VOUT/VIN > 65%, or switching frequency exceeds 1.5 MHz. It improves BST capacitor charging efficiency and stabilizes gate drive under high-duty-cycle conditions.
How does the MP4689AGN-Z achieve ±3% LED current accuracy?
Accuracy stems from tight tolerance on the internal 200 mV feedback reference (±15 mV hysteresis window), low FB input current (±300 nA), and adaptive threshold adjustment that compensates for propagation delays. External RFB tolerance and temperature drift dominate remaining error.
What is the maximum allowable LED forward voltage this IC can support?
Maximum VLED is constrained by the 95 V maximum input voltage minus the Schottky diode forward drop (typically 0.4–0.5 V) and inductor DCR losses. With 95 V input and 0.5 V diode drop, up to ~94.5 V LED string voltage is theoretically supported - though practical designs limit to ≤85 V for margin and thermal derating.
Does MP4689AGN-Z require an output capacitor for stable operation?
No - the MP4689AGN-Z operates stably without an output capacitor, delivering inherent 15% peak-to-peak LED current ripple. An output capacitor may be added solely to reduce ripple further, but it is not required for loop stability or basic functionality.
How is thermal performance affected if the exposed pad is not soldered to GND?
Without soldered exposed pad connection, θJA degrades from 50°C/W to >100°C/W, reducing maximum continuous power dissipation from 2.5 W to <1.2 W at +25°C ambient. Junction temperature will exceed 150°C under full 1 A load, triggering thermal shutdown and intermittent operation.
MP4689AGN-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 100V
- Voltage - Output:
- 72V
- Current - Output / Channel:
- 1A
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MP4689AGN-Z FAQ
1.How can I place an order for MP4689AGN-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4689AGN-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 MP4689AGN-Z reliable?
The price and inventory of MP4689AGN-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4689AGN-Z is usually 5 days.
3.What payment methods are accepted for MP4689AGN-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4689AGN-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4689AGN-Z?
MP4689AGN-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4689AGN-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 MP4689AGN-Z?
For technical support, including MP4689AGN-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4689AGN-Z requirements.
6.How does Aetrix verify that MP4689AGN-Z is sourced from the original manufacturer or authorized distributors?
All MP4689AGN-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 MP4689AGN-Z meets industry standards.
7.What is the process for return or replacement of MP4689AGN-Z?
All MP4689AGN-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4689AGN-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 MP4689AGN-Z part is unused and in its original packaging.
Return procedure for MP4689AGN-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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