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Microchip Technology TC105333ECTTR
- Part No.:
- TC105333ECTTR
- Manufacturer:
- Microchip Technology
- Category:
- DC DC Switching Controllers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TC105333ECTTR.pdf
- Description:
- IC REG CTRLR BUCK SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
TC105333ECTTR from Microchip Technology is a PFM/PWM step-down DC/DC controller IC designed to drive an external P-channel MOSFET or PNP transistor for 3.3V regulated output at up to 1A load. It operates from 2.2V–10V input, delivers 92% typical efficiency, features 300kHz fixed-frequency switching, and consumes only 57µA typical supply current. It is used in battery-operated portable instruments requiring compact, high-efficiency voltage conversion.
For engineers reviewing the TC105333ECTTR datasheet, TC105333ECTTR pinout, TC105333ECTTR application, or TC105333ECTTR equivalent, key selection criteria include its 3.3V factory-set output, 5-pin SOT-23A package, programmable soft-start via external RC, shutdown current below 0.5µA, and compatibility with 22µH inductors and low-ESR tantalum output capacitors.
Technical Context
The TC105333ECTTR implements dual-mode control-PWM under normal load and automatic transition to PFM at light loads (duty cycle <10%)-to maintain high efficiency across wide load ranges. Its EXT pin provides complementary gate/base drive with ON resistance of ≤22Ω to VDD and ≤19Ω to GND, enabling direct interface with Si9430 P-MOSFET or FZT749 PNP transistor.
It integrates undervoltage lockout (UVLO) triggering at 2.2V, supports externally programmable soft-start time via RSS/CSS network, and suspends regulation during SHDN assertion. The device requires no internal power switch, relying instead on external active components to achieve 1A output capability and thermal flexibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-trimmed 3.3V ±2.5%, enabling stable bias for 3.3V logic and analog circuitry without external feedback resistors. |
| Switching Frequency | 300kHz (±15%), allowing use of small 22µH surface-mount inductors and reducing EMI filter size. |
| Max Output Current | 1A continuous, achieved via external P-MOSFET or PNP transistor-enables high-current portable rail generation with thermal separation. |
| Supply Current (Typ) | 57µA at 25°C, minimizing quiescent drain in always-on subsystems such as real-time clock or sensor monitoring rails. |
| Shutdown Current | 0.5µA max, ensuring negligible battery leakage during system sleep modes in handheld devices. |
| Efficiency (Typ) | 92% at 3.3V/220mA with 5V input, directly reducing thermal load and extending battery runtime in compact enclosures. |
| Operating Temp | -40°C to +85°C, supporting industrial-grade operation in uncontrolled ambient environments like portable test equipment. |
Pinout & Package
TC105333ECTTR is housed in a 5-pin SOT-23A (EIAJ SC-74A) package-0.95mm pitch, 2.9mm × 1.6mm footprint-with exposed pad not electrically connected. Pin 1 is marked by a dot or bevelled edge; orientation follows standard SOT-23A tape-and-reel carrier direction (mark right-side-up).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EXT | External switch gate/base driver | Complementary output driving P-MOSFET gate or PNP base; RON ≤22Ω to VDD / ≤19Ω to GND enables efficient switching without external buffer. |
| 2 - VDD | Main power input | Accepts 2.2V–10V input; includes UVLO (2.2V threshold) and powers internal oscillator, reference, and control logic. |
| 3 - GND | Analog/digital ground reference | Single ground connection for all internal circuits; must tie to low-impedance PCB ground plane near input/output capacitors. |
| 4 - SHDN | Active-low enable/shutdown control | Logic-low (<0.2V) disables regulator and reduces supply current to ≤0.5µA; internally pulled up when unused. |
| 5 - VOUT | Output voltage sense input | Connects directly to regulated output node for feedback; no external resistor divider required due to factory-trimmed 3.3V reference. |
Key Features
| Feature | Design Value |
|---|---|
| PFM/PWM hybrid mode | Maintains >90% efficiency from 1mA to 1A load by automatically switching modulation schemes-critical for long battery life in intermittent-use devices. |
| Programmable soft-start | External RC (e.g., 470kΩ + 33nF) controls output ramp rate, eliminating startup overshoot and preventing inrush-induced brownout in shared power domains. |
| Integrated UVLO | Disables regulator below 2.2V input, preventing erratic operation during battery sag or cold-start conditions in NiMH-powered systems. |
| Low-ESR capacitor optimized | Designed for 47µF/10V tantalum (e.g., Sprague 595D), minimizing output ripple amplitude without requiring costly ceramic arrays. |
| External switch architecture | Decouples power handling from controller die-allows thermal management via MOSFET placement and enables 1A+ output with cost-effective discrete transistors. |
Applications
| Hand-Held Scanners | Portable Communicators |
|---|---|
Use Scenario: Battery-powered barcode scanner with CMOS image sensor and microcontroller requiring clean 3.3V rail. IC Role / Device Role / Timing Role: Step-down controller generating regulated 3.3V from 6V NiMH pack, managing transient load steps during LED flash and sensor readout. Use Value: 92% efficiency extends scan count per charge; 0.5µA shutdown current preserves battery over weeks of standby. | Use Scenario: Two-way radio handset using 3.3V RF front-end and digital baseband processor. IC Role / Device Role / Timing Role: Primary DC/DC controller supplying 3.3V to RF synthesizer and MCU, dynamically adapting between PWM and PFM during voice burst vs. idle periods. Use Value: 300kHz switching allows compact 22µH inductor; soft-start prevents audio pop during power-on sequencing. |
| Positive LCD Bias Generators | Battery-Operated Systems |
Use Scenario: Portable medical monitor with monochrome STN LCD requiring stable +3.3V bias voltage. IC Role / Device Role / Timing Role: Dedicated 3.3V regulator feeding LCD driver IC, operating continuously during display-on state with minimal ripple. Use Value: Factory-trimmed 3.3V eliminates calibration overhead; low 57µA quiescent current minimizes background drain during screen updates. | Use Scenario: Handheld multimeter powered by AA cells, needing reliable 3.3V for ADC, display, and Bluetooth LE module. IC Role / Device Role / Timing Role: Core power controller converting declining 3.0–4.5V battery voltage to stable 3.3V output across full discharge curve. Use Value: UVLO ensures graceful shutdown before measurement error onset; SOT-23A footprint saves space on dense 4-layer PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC105503ECTTR | Fixed 5.0V output (vs. 3.3V); identical pinout, package, and electrical specs otherwise. | Used where 5V logic or legacy peripherals require regulation-not suitable for 3.3V-only systems without post-regulation. | Select only if target output voltage matches; no PCB change needed but output voltage mismatch invalidates direct substitution. |
| TPS62231DRYR | Integrated 1A synchronous buck converter (vs. external-switch controller); 2.05V–6.5V input; 3.3V fixed output; 2.25MHz switching. | Reduces BOM count (no MOSFET/diode/inductor selection) but increases thermal density; lacks programmable soft-start and PFM/PWM auto-switching. | Choose for faster design cycle and smaller solution size; avoid when thermal isolation, ultra-low IQ, or custom inductor optimization is required. |
Compared with TC105503ECTTR, TC105333ECTTR delivers precise 3.3V without post-regulation, while TPS62231DRYR offers integration at the cost of design flexibility and higher light-load current-making TC105333ECTTR preferable for thermally constrained, battery-sensitive portable instruments.
Availability
TC105333ECTTR is available at Aetrix Electronics and suitable for portable instruments, hand-held scanners, and battery-operated systems requiring stable component supply with long-lifecycle support and consistent parametric performance.
Supply support for TC105333ECTTR 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
Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949-certified wafer fabrication and design centers worldwide.
The TC105 product line delivers highly integrated, low-quiescent-current DC/DC controllers for portable and battery-critical applications-designed specifically to maximize runtime and minimize board area in space-constrained consumer and industrial handhelds.
FAQ
What is the maximum input voltage rating for the TC105333ECTTR?
The TC105333ECTTR has an absolute maximum input voltage rating of +12V on the VDD pin, but its guaranteed operational range is 2.2V to 10.0V. Operation above 10V risks exceeding internal voltage limits and may cause permanent damage. For reliable 3.3V output, recommended input is 4.5V–6V, especially when powering from NiMH or Li-ion sources.
Does the TC105333ECTTR require external feedback resistors to set the 3.3V output?
No, the TC105333ECTTR does not require external feedback resistors. Its 3.3V output is factory-trimmed and internally referenced-pin 5 (VOUT) connects directly to the output node for sensing, eliminating resistor networks and associated tolerance drift. This simplifies layout and improves long-term output stability versus adjustable controllers.
Can the TC105333ECTTR drive a N-channel MOSFET instead of a P-channel device?
No, the TC105333ECTTR's EXT pin is designed exclusively as a high-side driver for P-channel MOSFETs or PNP transistors. It lacks bootstrap or level-shifting circuitry required to drive an N-channel MOSFET's gate above the input rail. Attempting to use an N-channel device will result in incomplete turn-on and excessive conduction losses.
What is the purpose of the SHDN pin on the TC105333ECTTR, and what logic level disables it?
The SHDN pin on the TC105333ECTTR is an active-low shutdown control. Driving it to ≤0.2V (logic low) disables the regulator, halting switching action and reducing supply current to ≤0.5µA. The device resumes normal operation when SHDN rises above 0.65V (logic high). If unused, SHDN may be tied directly to VDD.
Which inductor value is recommended for optimal performance with the TC105333ECTTR?
A 22µH inductor-such as the Sumida CD54 series-is recommended for the TC105333ECTTR. This value balances physical size, core loss, and ripple current while aligning with the 300kHz switching frequency. Inductors should have ≤20mΩ DC resistance and sufficient saturation current rating (>1.5A) to handle peak inductor current without derating.
TC105333ECTTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.2V ~ 10V
- Frequency - Switching:
- 300kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TC105333ECTTR FAQ
1.How can I place an order for TC105333ECTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC105333ECTTR 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 TC105333ECTTR reliable?
The price and inventory of TC105333ECTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC105333ECTTR is usually 5 days.
3.What payment methods are accepted for TC105333ECTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC105333ECTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC105333ECTTR?
TC105333ECTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC105333ECTTR 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 TC105333ECTTR?
For technical support, including TC105333ECTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC105333ECTTR requirements.
6.How does Aetrix verify that TC105333ECTTR is sourced from the original manufacturer or authorized distributors?
All TC105333ECTTR 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 TC105333ECTTR meets industry standards.
7.What is the process for return or replacement of TC105333ECTTR?
All TC105333ECTTR units undergo pre-shipment inspection (PSI). If there is an issue with TC105333ECTTR, 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 TC105333ECTTR part is unused and in its original packaging.
Return procedure for TC105333ECTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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