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Texas Instruments LP38693MPX-3.3
- Part No.:
- LP38693MPX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38693MPX-3.3.pdf
- Description:
- IC REG LIN 3.3V 500MA SOT223-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,850
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Product details
Overview
LP38693MPX-3.3 from Texas Instruments is a 500-mA, 3.3-V fixed-output CMOS low-dropout linear regulator with enable (EN) pin, PMOS pass transistor, ±2% output accuracy at 25°C, 250 mV typical dropout at 500 mA (VOUT = 5 V), and stable operation with 1-µF ceramic output capacitor. It serves as a primary voltage rail for battery-powered microcontroller subsystems in portable instrumentation.
For engineers reviewing the LP38693MPX-3.3 datasheet, LP38693MPX-3.3 pinout, LP38693MPX-3.3 application, or LP38693MPX-3.3 equivalent, key selection considerations include its 2.7–10 V input range, 1-µA shutdown quiescent current, thermal overload protection, foldback current limiting, and WSON-6 package with exposed thermal pad for high-ambient operation.
Technical Context
The LP38693MPX-3.3 uses a PMOS pass transistor architecture eliminating base-drive current, enabling ground pin current to remain ≤55 µA across full load, input voltage, and temperature range (−40°C to 125°C). Its precision trimmed bandgap reference and internal error amplifier deliver tight DC regulation and fast transient response.
It integrates enable logic, foldback current limiting (350 mA limit at VIN–VOUT > 5 V; 850 mA at < 4 V), and thermal shutdown activation at ~160°C with ~10°C hysteresis. The SNS pin-exclusive to WSON variants-supports remote sensing to compensate for PCB trace IR drop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2% at 25°C; ensures stable MCU core/logic supply without external feedback components. |
| Max Output Current | 500 mA continuous; supports mid-power digital loads including ARM Cortex-M4-based controllers and sensor interfaces. |
| Dropout Voltage | 330 mV typical at 500 mA (VOUT = 3.3 V); enables operation down to VIN = 3.63 V, critical for single-cell Li-ion or 2-cell alkaline systems. |
| Quiescent Current | 100 µA typical (active), 1 µA max (shutdown via EN); extends battery life in always-on monitoring nodes. |
| PSRR | 55 dB at 120 Hz; suppresses ripple from switching pre-regulators or noisy DC/DC stages feeding the LDO input. |
| Thermal Shutdown | Activates at ~160°C junction temperature with ~10°C hysteresis; prevents permanent damage during sustained overload or poor heatsinking. |
| Enable Threshold | VEN(ON) = 3.0 V min at VIN = 6 V; compatible with standard 3.3-V GPIO logic without level shifting. |
Pinout & Package
The LP38693MPX-3.3 is housed in a 6-pin WSON package (3.0 mm × 3.0 mm, 0.75 mm height) with an exposed thermal pad (DAP) on the bottom for enhanced heat dissipation. Pin 1 is IN, Pin 2 is GND, Pin 3 is EN, Pin 4 is OUT, Pin 5 is SNS, and Pin 6 is IN (dual IN pins require external tie-together for full 500-mA capability).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1 & 6) | Input supply connection | Both pins must be shorted externally; each rated for ≤250 mA to ensure full 500-mA operation and minimize bond-wire heating. |
| GND (Pin 2) | Power and signal reference ground | Internally connected to die substrate and thermal pad; requires low-impedance PCB copper pour for thermal and noise performance. |
| EN (Pin 3) | Active-high enable control | Pull ≥3.0 V (at VIN = 6 V) to enable; pull ≤0.4 V to disable; no internal pullup/pulldown - external termination mandatory. |
| OUT (Pin 4) | Regulated output voltage | Delivers 3.3 V to load; connects directly to local 1-µF ceramic capacitor; SNS pin must be tied to this node for non-remote-sense use. |
| SNS (Pin 5) | Remote output voltage sense | Connects to load-side of output trace to cancel IR drop error; must be tied directly to OUT if remote sensing not used. |
| DAP (Exposed Pad) | Thermal and electrical ground | Must be soldered to ≥100 mm² PCB copper area; provides primary thermal path and reduces θJA to 50.6°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for large, costly tantalum or electrolytic capacitors - reduces BOM cost and board area in space-constrained portable designs. |
| PMOS pass transistor architecture | Ground pin current remains ≤55 µA at full 500-mA load, independent of input voltage or temperature - simplifies power budgeting in multi-rail systems. |
| Enable pin with precise threshold | VEN(ON) = 3.0 V min at VIN = 6 V ensures reliable turn-on using standard 3.3-V logic; avoids false triggering in noisy environments. |
| Foldback current limiting | Reduces output current to ~350 mA when VIN–VOUT > 5 V, protecting against overcurrent during high-differential startup or fault conditions. |
| Thermal shutdown with hysteresis | Shuts down at ~160°C and re-enables at ~150°C - prevents thermal runaway while allowing safe recovery without manual reset. |
Applications
| Hard Disk Drive Power Management | Notebook Computer I/O Rail |
|---|---|
Use Scenario: Supplies regulated 3.3 V to HDD servo controller ASIC and interface logic during spin-up and active seek operations. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator delivering clean power after buck converter stage. Use Value: 55 dB PSRR at 120 Hz suppresses switching ripple from upstream DC/DC, preventing data corruption during high-speed read/write cycles. |
Use Scenario: Powers USB 3.0 PHY, PCIe endpoint logic, and embedded controller peripherals in ultrabook platforms. IC Role / Device Role / Timing Role: Fixed-output LDO providing stable 3.3-V bias under dynamic load transients up to 300 mA. Use Value: 330 mV dropout at 500 mA allows operation from shared 3.6-V battery rail, extending runtime versus higher-dropout alternatives. |
| Battery-Powered Medical Sensor Node | Portable Test & Measurement Instrumentation |
Use Scenario: Powers ultra-low-power ADC, analog front-end, and BLE radio in handheld ECG monitor operating from coin cell or Li-poly battery. IC Role / Device Role / Timing Role: Always-on LDO with 1-µA shutdown mode activated between measurement intervals. Use Value: 1-µA off-state quiescent current enables >1-year shelf life on CR2032; ±2% accuracy ensures calibrated sensor readings. |
Use Scenario: Delivers precision 3.3-V reference and logic supply to 16-bit SAR ADC, FPGA configuration circuitry, and display driver in handheld DMM. IC Role / Device Role / Timing Role: Low-noise, high-accuracy voltage source for metrology-grade signal chain components. Use Value: 0.7 µV/√Hz output noise minimizes added uncertainty in high-resolution measurements; WSON thermal pad sustains 125°C ambient operation. |
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 |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 3.3-V LDO array; 250-mA per channel; no SNS pin; 200-mV dropout at 200 mA. | Targeted at multi-rail systems requiring integrated channel enable; lacks remote sensing and thermal pad optimization. | Select when consolidating multiple low-current rails; avoid for single-rail high-accuracy or high-thermal-load use cases. |
| MCP1826-3302E/DB | 500-mA 3.3-V LDO; 350-mV dropout at 500 mA; 120-µA quiescent current; SOT-223 only; no EN pin. | Requires external ON/OFF control; higher dropout limits minimum input voltage; lacks WSON thermal performance. | Choose for cost-sensitive industrial designs where enable function and compact thermal packaging are non-critical. |
Compared with TPL7407LPGEDR and MCP1826-3302E/DB, the LP38693MPX-3.3 uniquely combines single-channel 500-mA capability, 1-µA shutdown, WSON thermal efficiency, and SNS-enabled accuracy - making it optimal for space- and thermal-constrained portable electronics demanding high reliability.
Availability
LP38693MPX-3.3 is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery-powered medical devices requiring stable component supply across extended production lifecycles.
Supply support for LP38693MPX-3.3 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
Texas Instruments is a global semiconductor company designing analog ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.
The LP38693MPX-3.3 belongs to TI's LP3869x family of low-dropout CMOS regulators, engineered specifically for portable, battery-powered digital systems requiring fast start-up, tight output tolerance, and ceramic-capacitor stability.
FAQ
What is the minimum input voltage required for LP38693MPX-3.3 to regulate 3.3 V output?
The LP38693MPX-3.3 requires VIN ≥ (VOUT + VDO) or 2.7 V, whichever is higher. With a typical dropout of 330 mV at 500 mA (VOUT = 3.3 V), minimum functional VIN is 3.63 V. However, the device begins operation at VIN = 2.7 V - regulation only commences once VIN exceeds the dropout threshold plus nominal output.
Can the SNS pin of LP38693MPX-3.3 be left unconnected?
No. The SNS pin on the LP38693MPX-3.3 must be connected directly to the OUT pin if remote sensing is not used. Leaving it floating violates the datasheet requirement and may cause regulation instability or output inaccuracy. For remote sensing, connect SNS to the load-side of the output trace - never leave it open.
Does LP38693MPX-3.3 support reverse voltage protection?
The LP38693MPX-3.3 does not include integrated reverse voltage protection. During reverse voltage conditions (VOUT > VIN), current flows through the inherent body diode of the PMOS pass transistor. To prevent damage, limit reverse current to <1 A continuous and <5 A peak - typically achieved using an external Schottky diode from OUT to GND.
What is the purpose of the dual IN pins (Pins 1 and 6) on LP38693MPX-3.3?
The dual IN pins on LP38693MPX-3.3 distribute input current to reduce bond-wire heating and improve thermal performance. Each pin is rated for ≤250 mA; both must be externally shorted to achieve full 500-mA output capability. Failure to tie them together risks localized overheating and premature failure under full load.
How does the foldback current limiting behave during repeated enable cycles of LP38693MPX-3.3?
Per the datasheet, foldback current limiting is functional only on the first enable event after VIN application. On subsequent EN toggles, foldback is disabled - potentially causing higher inrush current into output capacitance. To maintain consistent current limiting, cycle VIN instead of relying solely on EN toggling in systems sensitive to inrush.
LP38693MPX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-5, TO-261AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.55V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 55dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-5
LP38693MPX-3.3 FAQ
1.How can I place an order for LP38693MPX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693MPX-3.3 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 LP38693MPX-3.3 reliable?
The price and inventory of LP38693MPX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38693MPX-3.3 is usually 5 days.
3.What payment methods are accepted for LP38693MPX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693MPX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693MPX-3.3?
LP38693MPX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693MPX-3.3 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 LP38693MPX-3.3?
For technical support, including LP38693MPX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693MPX-3.3 requirements.
6.How does Aetrix verify that LP38693MPX-3.3 is sourced from the original manufacturer or authorized distributors?
All LP38693MPX-3.3 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 LP38693MPX-3.3 meets industry standards.
7.What is the process for return or replacement of LP38693MPX-3.3?
All LP38693MPX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP38693MPX-3.3, 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 LP38693MPX-3.3 part is unused and in its original packaging.
Return procedure for LP38693MPX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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