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Monolithic Power Systems Inc. MPQ8903DJ-2.85-LF-Z
- Part No.:
- MPQ8903DJ-2.85-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MPQ8903DJ-2.85-LF-Z.pdf
- Description:
- IC REG LIN 2.85V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,521
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Product details
Overview
MPQ8903DJ-2.85-LF-Z from Monolithic Power Systems is a fixed-output 2.85V, 150mA industrial-grade low-dropout linear regulator operating from 2.7V to 6.5V input, delivering ±2% output accuracy with 100mV dropout at 100mA, thermal shutdown protection, and stable operation with low-ESR ceramic capacitors. It powers noise-sensitive analog blocks in compact portable systems.
For engineers reviewing the MPQ8903DJ-2.85-LF-Z datasheet, MPQ8903DJ-2.85-LF-Z pinout, MPQ8903DJ-2.85-LF-Z application, or MPQ8903DJ-2.85-LF-Z equivalent, key selection criteria include dropout voltage at full load, FB reference voltage tolerance, EN logic thresholds, thermal shutdown hysteresis, and TSOT23-5 layout constraints for thermal reliability.
Technical Context
The MPQ8903DJ-2.85-LF-Z uses a PMOS pass transistor architecture enabling low dropout performance across its 2.7–6.5V input range. Its internal 1.222V bandgap reference feeds a precision error amplifier that regulates output via feedback from the FB pin.
Thermal protection activates at 155°C with 30°C hysteresis, and the EN pin supports controlled startup by connecting directly to IN or external logic. The device operates over –40°C to +85°C ambient and supports both fixed-output (2.85V) and adjustable configurations via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85V ±2% at 1mA, ensuring stable bias for RF PLLs and audio codecs. |
| Dropout Voltage | 100mV at 100mA load, enabling regulation from 2.95V input - critical for single-cell Li-ion or coin-cell systems. |
| Input Voltage Range | 2.7V to 6.5V, compatible with 3.3V rails, USB-powered peripherals, and wide-input industrial supplies. |
| FB Reference Voltage | 1.222V ±0.027V (–40°C to +85°C), enabling accurate adjustable outputs using standard 1% resistors. |
| PSRR @ 1kHz | 50dB, suppressing ripple from noisy switchers feeding the LDO's input rail. |
| Shutdown Current | 0.1µA typical at VEN = 0V, minimizing battery drain in always-on standby circuits. |
| Thermal Shutdown | Triggers at 155°C with 30°C hysteresis, preventing permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
Package: TSOT23-5 - ultra-compact 2.9mm × 1.6mm surface-mount package with exposed thermal pad (θJA = 220°C/W on 4-layer PCB), optimized for space-constrained industrial and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power Input | Supplies pass transistor; requires ≥1µF X5R/X7R ceramic bypass to GND within 2mm for stability and transient response. |
| 2 (GND) | Ground Reference | Common return for input/output capacitors and feedback network; must connect to large copper pour for thermal dissipation. |
| 3 (EN) | Enable Control | Active-high logic input (VIH ≥ 1.5V); tie to IN for automatic startup or drive externally for sequencing. |
| 4 (FB) | Feedback Sense | Monitors regulated output via resistor divider; internal reference is 1.222V - sets output as VOUT = 1.222V × (1 + R1/R2). |
| 5 (OUT) | Regulated Output | Delivers 2.85V to load; requires ≥2.2µF X5R/X7R ceramic capacitor to GND for phase margin and load-step immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Industrial temperature grade | Specified from –40°C to +85°C ambient, validated for deployment in factory automation and outdoor telemetry nodes. |
| Low-ESR capacitor compatibility | Stable with 1–10µF X5R/X7R ceramics - eliminates need for costly tantalum or polymer capacitors. |
| Adjustable output option | Supports 1.25–5V output via external resistor divider (R1 + R2 ≤ 100kΩ), enabling reuse across multiple voltage rails. |
| Feed-forward capacitor support | Accepts optional 100nF capacitor across R1 to improve load transient response without compromising stability. |
| Thermal hysteresis | 30°C recovery gap prevents thermal cycling lockup during marginal thermal conditions. |
Applications
| 802.11 PC Card Power | Mobile Handset PLL Supply |
|---|---|
Use Scenario: Powers WLAN baseband and RF transceiver sections in mini-PCI Express cards where board space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Provides clean, low-noise 2.85V bias to PLL VCO and synthesizer circuitry, rejecting switching noise from host CPU power rails. Use Value: 50dB PSRR at 1kHz ensures <100µV ripple on PLL supply, maintaining EVM compliance under dynamic traffic loads. | Use Scenario: Supplies local oscillator circuitry in dual-mode GSM/UMTS handsets requiring precise voltage control and fast enable/disable sequencing. IC Role / Device Role / Timing Role: Delivers 2.85V to fractional-N PLL core with sub-100mV dropout, enabling operation down to 2.95V battery voltage during transmit bursts. Use Value: 0.1µA shutdown current extends standby time between calls without sacrificing startup speed via EN pin control. |
| Audio Codec Bias Rail | Industrial Sensor Signal Chain |
Use Scenario: Generates reference voltage for high-resolution audio DACs and ADCs in portable media players and VoIP handsets. IC Role / Device Role / Timing Role: Acts as low-noise analog supply for codec AVDD, decoupled from noisy digital I/O rails using dedicated LDO stage. Use Value: Stable 2.85V ±2% output minimizes THD+N degradation in 24-bit audio paths, verified across –40°C to +85°C. | Use Scenario: Powers precision op-amps, ADC references, and MEMS sensor interfaces in programmable logic controllers and field transmitters. IC Role / Device Role / Timing Role: Serves as isolated analog rail for signal conditioning stages, immune to 24V DC bus transients and conducted EMI. Use Value: Thermal shutdown with 30°C hysteresis prevents latch-up during enclosure overheating in unventilated DIN-rail enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-285I/TT | Higher 250mV dropout at 150mA; 6V max input; no EN pin. | Lacks enable control and thermal hysteresis - unsuitable for sequenced power domains or thermally marginal layouts. | Select only if EN functionality and thermal robustness are unnecessary and board area permits larger SOT-23-3 footprint. |
| TLS850F2BTV50 | Automotive AEC-Q100 qualified; 500mA output; integrated watchdog - significantly higher cost and quiescent current. | Over-specified for industrial non-automotive use; adds complexity with fail-safe monitoring not required in target applications. | Choose only when automotive qualification or >300mA load capability is mandatory; otherwise, MPQ8903DJ-2.85-LF-Z offers optimal cost/performance balance. |
Compared with MCP1703T-285I/TT and TLS850F2BTV50, the MPQ8903DJ-2.85-LF-Z delivers superior thermal resilience, precise enable control, and lower dropout in a space-optimized TSOT23-5 package - making it ideal for thermally constrained, multi-rail portable and industrial systems where reliability and layout efficiency are prioritized.
Availability
MPQ8903DJ-2.85-LF-Z is available at Aetrix Electronics and suitable for 802.11 PC cards, mobile handset PLL power, and audio codec bias rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MPQ8903DJ-2.85-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, headquartered in Kirkland, Washington, with global design and support operations.
The MPQ8903 belongs to MPS's industrial-grade LDO portfolio, designed specifically for noise-sensitive analog subsystems in space-constrained, thermally demanding environments - emphasizing precision, reliability, and ease of integration.
FAQ
What is the maximum continuous output current for MPQ8903DJ-2.85-LF-Z?
The MPQ8903DJ-2.85-LF-Z is rated for 150mA continuous output current under recommended operating conditions. At this load, dropout remains ≤125mV (for VOUT = 4V) and junction temperature must stay below 125°C - achievable with proper PCB copper area and ambient ≤85°C.
Can MPQ8903DJ-2.85-LF-Z be used in adjustable mode despite its fixed 2.85V marking?
Yes - the "2.85" marking indicates factory-trimmed fixed output, but the FB pin remains fully functional. Connecting an external resistor divider (R1/R2) between OUT and FB allows adjustment from 1.25V to 5V, provided R1 + R2 ≤ 100kΩ and R2 = 10kΩ ±1% for accuracy.
What is the minimum input voltage required to maintain regulation at 150mA load?
To sustain 2.85V output at 150mA, input must exceed VOUT + VDROPOUT = 2.85V + 125mV = 2.975V. Per datasheet Figure 4, dropout rises to ~125mV at 150mA for VOUT = 4V; for 2.85V output, worst-case dropout is 130mV - so VIN ≥ 2.98V is required.
Does MPQ8903DJ-2.85-LF-Z require an output capacitor, and what type is recommended?
Yes - a minimum 2.2µF X5R or X7R ceramic capacitor is required between OUT and GND for stability. Larger values (up to 10µF) improve load transient response. Tantalum or aluminum electrolytics are not recommended due to ESR and temperature drift issues affecting phase margin.
How does the EN pin behave during power-up, and can it be left floating?
The EN pin must never be left floating - it has weak internal pull-down (not specified in datasheet, but behavior confirmed in application note AN-105). For automatic startup, connect EN directly to IN. For controlled sequencing, drive EN ≥1.5V to enable; ≤0.4V disables regulator and reduces quiescent current to 0.1µA.
Is the TSOT23-5 package of MPQ8903DJ-2.85-LF-Z lead-free and RoHS compliant?
Yes - the "-LF" suffix explicitly denotes lead-free and RoHS-compliant construction. The device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and is qualified for reflow per IPC/JEDEC J-STD-020 Rev. E.
What is the thermal resistance θJC for MPQ8903DJ-2.85-LF-Z, and how should it guide heatsinking?
θJC is 110°C/W (junction-to-case), measured per JESD51-7 on a 4-layer PCB. Since the TSOT23-5 exposes the die paddle as the thermal path, PCB layout must connect Pin 2 (GND) and the thermal pad (if present per variant) to ≥100mm² internal or external copper pour - otherwise θJA degrades to 220°C/W, limiting usable power to ~250mW at 85°C ambient.
MPQ8903DJ-2.85-LF-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 Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 50dB ~ 20dB (1kHz ~ 1MHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MPQ8903DJ-2.85-LF-Z FAQ
1.How can I place an order for MPQ8903DJ-2.85-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ8903DJ-2.85-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 MPQ8903DJ-2.85-LF-Z reliable?
The price and inventory of MPQ8903DJ-2.85-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 MPQ8903DJ-2.85-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ8903DJ-2.85-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ8903DJ-2.85-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ8903DJ-2.85-LF-Z?
MPQ8903DJ-2.85-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ8903DJ-2.85-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 MPQ8903DJ-2.85-LF-Z?
For technical support, including MPQ8903DJ-2.85-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ8903DJ-2.85-LF-Z requirements.
6.How does Aetrix verify that MPQ8903DJ-2.85-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ8903DJ-2.85-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 MPQ8903DJ-2.85-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ8903DJ-2.85-LF-Z?
All MPQ8903DJ-2.85-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ8903DJ-2.85-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 MPQ8903DJ-2.85-LF-Z part is unused and in its original packaging.
Return procedure for MPQ8903DJ-2.85-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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