My Inquiry
My Account
Monolithic Power Systems Inc. MPQ8903DJ-3.3-LF-Z
- Part No.:
- MPQ8903DJ-3.3-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MPQ8903DJ-3.3-LF-Z.pdf
- Description:
- IC REG LIN 3.3V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,184
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPQ8903DJ-3.3-LF-Z from Monolithic Power Systems is an industrial-grade 150mA low-dropout linear regulator with fixed 3.3V output, ±2% accuracy, 2.7V–6.5V input range, 100mV dropout at 100mA, and thermal shutdown protection. It operates across –40°C to +85°C ambient and delivers stable power to noise-sensitive analog blocks in compact portable systems.
For engineers reviewing the MPQ8903DJ-3.3-LF-Z datasheet, MPQ8903DJ-3.3-LF-Z pinout, MPQ8903DJ-3.3-LF-Z application, or MPQ8903DJ-3.3-LF-Z equivalent, key selection criteria include guaranteed industrial temperature operation, low-ESR capacitor compatibility, enable-controlled sequencing, fixed-output precision, and TSOT23-5 footprint constraints for space-constrained PCBs.
Technical Context
The MPQ8903DJ-3.3-LF-Z uses a PMOS pass transistor architecture enabling ultra-low dropout (100mV @ 100mA) and inherent reverse-current blocking. Its internal 1.222V bandgap reference feeds a precision error amplifier that regulates output via feedback from the FB pin-bypassed internally for fixed 3.3V operation.
Thermal protection activates at 155°C with 30°C hysteresis, and the EN pin provides logic-level on/off control with <2µA shutdown current. The device is optimized for stability with 1µF–10µF X5R/X7R ceramic output capacitors and requires no external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over –40°C to +85°C; enables direct replacement of standard 3.3V logic rails without resistor network tuning. |
| Dropout Voltage | 100mV at 100mA load; supports regulation down to VIN = 3.4V, critical for battery-powered systems near end-of-discharge. |
| Input Voltage Range | 2.7V to 6.5V; accommodates single-cell Li-ion (3.0–4.2V), USB 5V, and regulated 3.3V/5V rails with margin. |
| Load Current | 150mA maximum continuous; sufficient for powering RF transceivers, audio codecs, or sensor signal chains in portable devices. |
| PSRR | 50dB at 1kHz, 20dB at 1MHz; suppresses switching noise from adjacent DC-DC converters feeding shared input rails. |
| Shutdown Current | 0.1–2µA at VEN = 0V; preserves battery life during system sleep modes without external discharge paths. |
| Thermal Shutdown | 155°C activation with 30°C hysteresis; prevents permanent damage during sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
MPQ8903DJ-3.3-LF-Z is housed in a 5-pin TSOT23 package (2.9mm × 1.6mm × 0.85mm), optimized for high-density layouts and thermal dissipation via exposed pad (GND-connected). Pin 1 is IN, Pin 2 is GND, Pin 3 is EN, Pin 4 is FB, and Pin 5 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input power supply connection | Accepts 2.7–6.5V; must be bypassed with ≥1µF X5R/X7R ceramic capacitor placed adjacent to pin for transient immunity. |
| 2 (GND) | Power and signal reference ground | Common return path for IN, OUT, EN, and FB; connects to large copper pour for thermal conduction and noise reduction. |
| 3 (EN) | Logic-enable control input | Active-high (≥1.5V); ties directly to IN for automatic startup or driven by MCU GPIO for sequenced power-up. |
| 4 (FB) | Feedback voltage sensing node | Internally connected to 3.3V divider; left unconnected in fixed-output mode; used with external R1/R2 for adjustable outputs. |
| 5 (OUT) | Regulated output terminal | Delivers 3.3V ±2%; requires ≥1µF X5R/X7R ceramic capacitor to GND for stability and load-transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Industrial temperature grade | Specified for –40°C to +85°C ambient operation, ensuring reliability in automotive infotainment and industrial handhelds. |
| Low-ESR capacitor compatibility | Stable with 1–10µF X5R/X7R ceramics only-eliminates need for tantalum or aluminum electrolytics and reduces board area. |
| Enable-controlled sequencing | EN pin allows precise power-up timing relative to other rails, preventing latch-up or brown-out in multi-rail systems. |
| Thermal protection with hysteresis | Shuts down at 155°C and re-enables only after cooling to 125°C, avoiding oscillatory shutdown/restart under sustained overload. |
Applications
| 802.11 PC Cards | Mobile Handset PLL Power |
|---|---|
Use Scenario: Powering WLAN baseband and RF front-end ICs in mini-PCI Express cards where space and thermal envelope are constrained. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying clean bias to Wi-Fi transceivers and clock buffers requiring low-noise, low-ripple DC. Use Value: 50dB PSRR at 1kHz rejects noise from host CPU switching, preserving WLAN EVM and receiver sensitivity. | Use Scenario: Delivering ultra-stable 3.3V to phase-locked loop (PLL) circuitry in GSM/UMTS handsets during burst transmission. IC Role / Device Role / Timing Role: Low-noise local regulator isolating PLL VCO and charge-pump supplies from noisy system rails. Use Value: 100mV dropout ensures regulation remains active even as battery voltage drops below 3.4V during peak transmit current. |
| Audio Codec Power | Industrial Sensor Signal Chain |
Use Scenario: Providing dedicated 3.3V rail to stereo audio codecs in portable media players and VoIP handsets. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source for ADC/DAC reference and analog front-end stages. Use Value: ±2% output accuracy maintains consistent full-scale dynamic range across temperature, minimizing calibration drift. | Use Scenario: Powering precision analog sensors (e.g., RTD, strain gauge amplifiers) in factory automation modules operating in harsh environments. IC Role / Device Role / Timing Role: Industrial-grade LDO delivering stable 3.3V to instrumentation amplifiers and sigma-delta ADCs. Use Value: Guaranteed –40°C to +85°C operation and thermal shutdown prevent field failures in unventilated 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 |
|---|---|---|---|
| MCP1700T-3302E/TT | 100mA max load, 600mV dropout at 100mA, SOT23-3 package (no EN or FB pins) | Lacks enable control and feedback adjustability; limited to simpler, lower-current use cases | Select when board space is extremely constrained and enable sequencing is unnecessary. |
| TLS850F3TAV50 | 500mA output, integrated watchdog and reset, AEC-Q100 qualified, TO-252 package | Automotive-qualified with safety features; larger footprint and higher quiescent current | Select for automotive body electronics requiring functional safety compliance and higher current headroom. |
Compared with MCP1700T-3302E/TT and TLS850F3TAV50, the MPQ8903DJ-3.3-LF-Z uniquely balances industrial temperature range, 150mA capability, enable control, and TSOT23-5 size-making it optimal for portable industrial and communications equipment where precision, sequencing, and thermal robustness are jointly required.
Availability
MPQ8903DJ-3.3-LF-Z is available at Aetrix Electronics and suitable for 802.11 PC cards, mobile handset PLL power, and audio codec power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MPQ8903DJ-3.3-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, with design centers in the US, China, and Taiwan.
The MPQ8903 belongs to MPS's industrial-grade linear regulator product line, engineered for reliable operation in portable and embedded systems where low noise, small footprint, and thermal resilience are essential.
FAQ
What is the minimum input voltage required to maintain 3.3V output at full 150mA load?
The MPQ8903DJ-3.3-LF-Z requires VIN ≥ VOUT + VDROPOUT. At 150mA, dropout is 125mV (per datasheet Table 1), so minimum VIN = 3.3V + 0.125V = 3.425V. Below this, output voltage collapses proportionally with input.
Can the MPQ8903DJ-3.3-LF-Z be used with an output capacitor smaller than 1µF?
No. The datasheet specifies 1µF–10µF X5R/X7R ceramic capacitors for stability. Using <1µF risks oscillation, poor load transient response, and failure to meet PSRR or dropout specifications across temperature and load.
Is the FB pin accessible for adjusting the output voltage on the MPQ8903DJ-3.3-LF-Z?
Yes. Though configured for fixed 3.3V, the FB pin is internally connected to the divider midpoint and remains externally accessible. Removing the internal divider (not possible on this variant) isn't required-external resistors can override it per the VOUT = 1.222V × (1 + R1/R2) equation.
Does the EN pin require a pull-up resistor when driven by an open-drain MCU GPIO?
Yes. Since EN is active-high with no internal pull-up, an external 10kΩ–100kΩ pull-up to IN or another valid supply is required to ensure reliable startup when the MCU GPIO is high-impedance or inactive.
How does thermal shutdown behave during continuous overload?
When junction temperature reaches 155°C, the device shuts off output. It remains off until temperature falls to ~125°C (155°C – 30°C hysteresis), then resumes regulation-preventing destructive thermal cycling and enabling safe recovery without manual reset.
What is the maximum allowable power dissipation at +70°C ambient?
Using θJA = 220°C/W and TJ(MAX) = 150°C: PD(MAX) = (150°C – 70°C) / 220°C/W = 364mW. At 3.3V output and 150mA load, power dissipated is (VIN – 3.3V) × 0.15A; thus VIN must stay ≤ 5.73V to remain within limit.
Are there layout recommendations to maximize PSRR performance?
Yes: place C1 (≥1µF X5R) within 2mm of IN–GND; route FB trace short and away from noisy signals; connect GND pins to a solid inner-layer plane; avoid splitting GND under the IC; and keep EN trace shielded from switching nodes to prevent false turn-off.
MPQ8903DJ-3.3-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):
- 3.3V
- 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-3.3-LF-Z FAQ
1.How can I place an order for MPQ8903DJ-3.3-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ8903DJ-3.3-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-3.3-LF-Z reliable?
The price and inventory of MPQ8903DJ-3.3-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-3.3-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ8903DJ-3.3-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ8903DJ-3.3-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ8903DJ-3.3-LF-Z?
MPQ8903DJ-3.3-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ8903DJ-3.3-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-3.3-LF-Z?
For technical support, including MPQ8903DJ-3.3-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ8903DJ-3.3-LF-Z requirements.
6.How does Aetrix verify that MPQ8903DJ-3.3-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ8903DJ-3.3-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-3.3-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ8903DJ-3.3-LF-Z?
All MPQ8903DJ-3.3-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ8903DJ-3.3-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-3.3-LF-Z part is unused and in its original packaging.
Return procedure for MPQ8903DJ-3.3-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPQ8903DJ-3.3-LF-Z Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
