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Monolithic Power Systems Inc. MP171AGJ-Z
- Part No.:
- MP171AGJ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- AC DC Converters, Offline Switches
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MP171AGJ-Z.pdf
- Description:
- IC OFFLIN CONV MULT TOP TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,526
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Product details
Overview
MP171AGJ-Z from Monolithic Power Systems is a 700V primary-side constant-voltage offline regulator with integrated MOSFET, supporting buck/boost/buck-boost/flyback topologies in non-isolated AC/DC power supplies. It delivers up to 60mA output current in CCM, achieves <30mW no-load consumption, and features frequency foldback and peak current compression for light-load efficiency. It targets standby power and low-power home appliance auxiliary supplies.
For engineers reviewing the MP171AGJ-Z datasheet, MP171AGJ-Z pinout, MP171AGJ-Z application, or MP171AGJ-Z equivalent, key selection criteria include its 700V drain rating, TSOT23-5 package constraints, primary-side CV regulation without optocoupler, green-mode operation behavior, and thermal shutdown recovery hysteresis of 30°C.
Technical Context
The MP171AGJ-Z implements primary-side regulation using internal sampling of output voltage via a feedback capacitor (C3), eliminating optocoupler dependency. Its control loop uses an internal error amplifier with 6µs delayed sampling and ramp compensation that scales exponentially with decreasing peak current - improving load regulation under light loads.
It operates in green mode: switching frequency and peak current limit both decrease with load, enabling <30mW no-load power consumption. Protection logic includes auto-restart OLP (175ms delay), SCP (300mA threshold), open-loop detection (0.5V FB threshold), and thermal shutdown at 150°C with 120°C recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain voltage rating | 700V - supports direct connection to rectified universal AC input (85–265VAC) without external HV MOSFET. |
| Max output current (CCM) | 60mA - defines maximum continuous load capability in continuous conduction mode for 5V/2W designs. |
| No-load consumption | <30mW - enables Energy Star Level VI and EU CoC Tier 2 standby compliance in low-power auxiliary rails. |
| FB reference voltage | 2.55V ±0.1V - sets output voltage accuracy via external resistor divider (e.g., 5V = 2.55V × (R1+R2)/R2). |
| VCC operating range | 5.1V to 5.7V - narrow UVLO hysteresis (250mV) ensures stable startup and brownout recovery in capacitor-fed VCC supplies. |
| Thermal shutdown threshold | 150°C - junction temperature limit with 30°C hysteresis ensures safe thermal cycling during overload transients. |
| SCP threshold | 300mA typical - protects against shorted outputs while allowing 512-cycle blanking during soft-start to avoid false triggering. |
Pinout & Package
MP171AGJ-Z is housed in a thermally enhanced TSOT23-5 package with exposed drain pad for improved heat dissipation. The 5-pin configuration supports compact, high-voltage flyback/buck implementations where board space and EMI are critical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DRAIN | High-voltage MOSFET drain | Connects directly to rectified AC line; carries full primary current and withstands 700V transient spikes. |
| 2 - VCC | Internal bias supply input | Powered by internal HV current source; requires external 1–4.7µF capacitor for stable operation and fault recovery. |
| 3 - FB | Feedback input | Monitors sampled output voltage via RC network; triggers switching when voltage drops below 2.55V reference. |
| 4,5 - SOURCE | MOSFET source and ground reference | Common return for VCC and FB; must be low-inductance connection to minimize noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side constant voltage regulation | Eliminates optocoupler and secondary-side TL431, reducing BOM count and layout complexity in cost-sensitive appliances. |
| Integrated 700V MOSFET with 25Ω RDS(on) | Enables single-chip offline regulator design for ≤2W outputs; eliminates external HV switch and gate driver. |
| Frequency foldback + peak current compression | Reduces switching losses and magnetic core losses at light loads, achieving >65% efficiency at 10% load (50mW). |
| Auto-restart protections (OLP/SCP/TSD/Open-loop) | Ensures robust field operation: 175ms OLP timer avoids nuisance tripping during startup; 300mA SCP prevents transformer saturation. |
| Internally biased VCC with 16µA latch-off discharge | Enables predictable restart timing after faults using only VCC capacitor value - no external timing components required. |
Applications
| Smart Appliance Standby Supply | White Goods Control Board Power |
|---|---|
|
Use Scenario: Providing 5V/30mA auxiliary power for microcontroller, display, and sensor interface in washing machine control boards. IC Role / Device Role / Timing Role: Primary-side offline regulator delivering isolated-free CV output directly from rectified mains, replacing transformer-based linear supplies. Use Value: Reduces system size by 40% and cuts no-load power to <30mW - meeting IEC 62301 Ed.2 Class F requirements for household appliances. |
Use Scenario: Generating 3.3V/25mA rail for IoT connectivity module (Wi-Fi/BLE SoC) in refrigerator smart inverter controls. IC Role / Device Role / Timing Role: Green-mode CV regulator operating in DCM at standby, transitioning to CCM during active communication bursts. Use Value: Maintains 72% efficiency at 10mA load while suppressing conducted EMI via frequency jitter and optimized LEB (350ns). |
| Industrial Sensor Node Auxiliary Power | LED Driver Bias Supply |
|
Use Scenario: Powering 3.3V/20mA microcontroller and analog front-end in DIN-rail mounted temperature/humidity sensors. IC Role / Device Role / Timing Role: Non-isolated buck-derived regulator accepting 90–305VAC input, leveraging internal 700V drain for direct rectifier interface. Use Value: Achieves -40°C to +125°C ambient operation with thermal shutdown recovery at 120°C - ensuring reliability in unventilated enclosures. |
Use Scenario: Supplying 12V/15mA bias for LED driver IC gate control in commercial downlight drivers. IC Role / Device Role / Timing Role: Flyback-configured primary-side regulator providing stable bias independent of main LED string regulation. Use Value: Enables fast start-up (<500ms) with two-phase soft-start (48µs → 10µs tMINOFF) and avoids false SCP during large output capacitor charging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar primary-side offline regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP172AGJ-Z | Higher 80mA CCM output current; identical 700V drain rating and TSOT23-5 package. | Supports up to 2.5W output; requires larger inductor and adjusted FB divider for same VOUT. | Select when >60mA sustained load or higher output power margin is required. |
| LNK3206G | 725V drain rating; integrated 700V MOSFET but uses secondary-side sensing with optocoupler feedback. | Requires optocoupler and TL431; offers tighter ±3% CV accuracy vs. MP171AGJ-Z's ±5%. | Choose when tighter output regulation or legacy design compatibility outweighs BOM simplification. |
Compared with MP171AGJ-Z, MP172AGJ-Z extends power capability without changing footprint or control architecture, while LNK3206G trades primary-side simplicity for higher accuracy and higher voltage margin - making it suitable for harsher surge environments but increasing component count and layout sensitivity.
Availability
MP171AGJ-Z is available at Aetrix Electronics and suitable for home appliance standby power, industrial sensor node auxiliary supplies, and white goods control board power requiring stable component supply across extended product lifecycles.
Supply support for MP171AGJ-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, AC/DC, and motor driver solutions.
The MP171A product line delivers cost-optimized, primary-side regulated offline controllers targeting sub-2W auxiliary power in consumer and industrial applications - emphasizing integration, EMI performance, and green-mode efficiency.
FAQ
What is the minimum recommended VCC capacitor value for reliable MP171AGJ-Z operation?
A 2.2µF X5R ceramic capacitor is recommended between VCC and SOURCE pins. This value ensures sufficient energy storage to sustain operation during light-load frequency foldback and provides adequate hold-up time during OLP or SCP fault recovery cycles. Lower values risk premature VCC dropout below VCCSTOP (3.4V), causing unintended shutdown.
Can MP171AGJ-Z be used in isolated flyback configurations?
Yes - MP171AGJ-Z supports isolated flyback topology using indirect feedback via an auxiliary winding. The device samples output voltage through the auxiliary winding and feedback resistor network, enabling isolation while retaining primary-side regulation. Design requires careful turns ratio selection to ensure FB voltage stays within 0.4–2.65V range across line/load conditions.
How does the MP171AGJ-Z achieve <30mW no-load consumption?
It combines three mechanisms: (1) frequency foldback reduces switching losses at light loads; (2) peak current compression lowers magnetic core losses; and (3) internal IC consumption drops to 200µA in no-switching state. Together, these reduce total input power to <30mW at 230VAC with proper transformer design and minimal dummy load.
What is the purpose of the 350ns leading-edge blanking (LEB) on the current sense path?
The 350ns LEB disables the current comparator immediately after MOSFET turn-on to ignore parasitic turn-on spikes from transformer leakage inductance and diode reverse recovery. This prevents false overcurrent triggering during normal switching transitions - especially critical in high-frequency or high-dV/dt flyback designs.
Does MP171AGJ-Z require an external Zener diode on the FB pin for stability?
No - MP171AGJ-Z includes internal ramp compensation and error amplifier compensation. Stability is achieved via external RC network on FB (typically 22nF capacitor from FB to SOURCE, plus optional series resistor). A Zener is only needed if clamping is required for overvoltage protection beyond internal 6.5V absolute max rating.
What PCB layout practices are critical for EMI performance with MP171AGJ-Z?
Minimize high-di/dt loop area formed by DRAIN–SOURCE–inductor–diode; place FB capacitor (22nF) directly between FB and SOURCE pins with shortest possible traces; connect exposed drain pad to large copper pour tied to DRAIN net; and add 220–470pF capacitor from FB to SOURCE near IC to suppress high-frequency noise injection.
How does open-loop detection behave during startup?
Open-loop detection is blanked for the first 512 switching cycles to prevent false triggering when the output capacitor is charging. After this period, if FB voltage falls below 0.5V (VOLD), the IC stops switching and initiates auto-restart - discharging VCC to VCCPRO (2.5V) before re-enabling the HV regulator for recovery.
MP171AGJ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Isolation:
- Non-Isolated
- Internal Switch(s):
- No
- Voltage - Breakdown:
- 700V
- Topology:
- Boost, Buck, Buck-Boost, Flyback
- Voltage - Start Up:
- -
- Voltage - Supply (Vcc/Vdd):
- 5.5V ~ 5.7V
- Duty Cycle:
- -
- Frequency - Switching:
- -
- Power (Watts):
- 2 W
- Fault Protection:
- Open Loop, Over Load, Over Temperature, Short Circuit
- Control Features:
- Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- TSOT-23-5
- Mounting Type:
- Surface Mount
MP171AGJ-Z FAQ
1.How can I place an order for MP171AGJ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP171AGJ-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 MP171AGJ-Z reliable?
The price and inventory of MP171AGJ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP171AGJ-Z is usually 5 days.
3.What payment methods are accepted for MP171AGJ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP171AGJ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP171AGJ-Z?
MP171AGJ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP171AGJ-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 MP171AGJ-Z?
For technical support, including MP171AGJ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP171AGJ-Z requirements.
6.How does Aetrix verify that MP171AGJ-Z is sourced from the original manufacturer or authorized distributors?
All MP171AGJ-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 MP171AGJ-Z meets industry standards.
7.What is the process for return or replacement of MP171AGJ-Z?
All MP171AGJ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP171AGJ-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 MP171AGJ-Z part is unused and in its original packaging.
Return procedure for MP171AGJ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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