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Microchip Technology TC120303EHATR
- Part No.:
- TC120303EHATR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.173", 4.40mm Width)
- Datasheet:
-
TC120303EHATR.pdf
- Description:
- IC REG BUCK 3V 600MA 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,795
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Product details
Overview
TC120303EHATR from Microchip Technology is a 300kHz PFM/PWM step-down DC/DC regulator/controller IC with internal P-channel switch, delivering up to 600mA output current at 3.0V, featuring programmable soft-start, short-circuit protection, and 95% typical efficiency-used in portable test equipment and palmtop logic supplies.
For engineers reviewing the TC120303EHATR datasheet, TC120303EHATR pinout, TC120303EHATR application, or TC120303EHATR equivalent, this page provides verified functional specifications, validated 8-pin SOP package mapping, confirmed shutdown/soft-start timing (6–16ms), and real-world design meaning for UVLO (0.9–1.8V), LX ON-resistance (0.44–0.94Ω), and EXT/EXTW drive capability.
Technical Context
The TC120303EHATR operates as either an integrated buck regulator (using its internal P-channel MOSFET) or a controller for external P-MOSFETs supporting >2A loads. Its dual-mode PWM/PFM modulation dynamically switches based on load: PWM dominates above ~120mA, while PFM activates below that threshold to maintain high light-load efficiency.
It integrates undervoltage lockout (UVLO active below 0.9–1.8V), automatic output capacitor discharge during shutdown (via internal GND switch), and two gate-drive outputs-EXT (synchronized with internal switch) and EXTW (100ns edge-blanked version)-enabling robust external transistor control without added timing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V ±2.5% (factory-programmed; tight regulation via SENSE pin feedback) |
| Max Output Current | 600mA (with internal switch at VIN=5V/VOUT=3.0V; scalable to 2A+ with external P-MOSFET) |
| Oscillator Frequency | 300kHz (typical; enables compact 22µH inductor selection and low EMI) |
| Efficiency | 95% (typical at full load; drops slightly when charge pump disabled or at very light loads) |
| Shutdown Current | 2.5µA (max; ensures ultra-low quiescent power in battery-powered standby) |
| Soft-Start Time | 10ms (typical; prevents inrush current and output overshoot via 4.7nF CSS capacitor) |
| LX ON-Resistance | 0.44–0.94Ω (varies with VOUT; lower RDS(on) improves thermal performance at high load) |
Pinout & Package
TC120303EHATR is housed in an industry-standard 8-pin Small Outline Package (SOP), 1.75mm height, 5.5mm × 4.6mm footprint, tape-and-reel packaged (1000 pcs/reel, 8mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 1.8–10V input; powers internal circuitry and switching stage |
| EXTW (Pin 2) | Extended external gate drive | 100ns blanked version of EXT; extends external P-MOSFET ON time for improved timing margin |
| CPC (Pin 3) | Charge pump capacitor node | Enables negative gate drive for lower RDS(on); must be grounded if unused |
| SHDN/SS (Pin 4) | Combined shutdown & soft-start control | Logic-low disables regulator and discharges VOUT; internal 1µA current source charges CSS for controlled ramp-up |
| SENSE (Pin 5) | Output voltage feedback sense | Connects directly to load point for precision regulation; decouples feedback from PCB trace IR drop |
| GND (Pin 6) | Power ground reference | Single-point grounding required with CIN/COUT to minimize noise coupling |
| EXT (Pin 7) | External P-MOSFET gate driver | Drives external switch with ≤32Ω pull-up / ≤26Ω pull-down (at VOUT=5V); supports ≤1000pF gate capacitance |
| LX (Pin 8) | Switching node / internal FET drain | Connects to inductor; carries high di/dt current; requires short, low-inductance layout to reduce ringing |
Key Features
| Feature | Design Value |
|---|---|
| PFM/PWM auto-transition | Eliminates manual mode selection; sustains >85% efficiency from 1mA to 600mA load range |
| Internal short-circuit protection | 5ms response time (typical); cycles into soft-start recovery instead of latch-off, enabling self-recovery |
| Programmable soft-start | Adjustable via CSS capacitor (100pF–4700pF); prevents overshoot and inrush stress on downstream logic |
| Automatic output discharge | Active during shutdown; pulls VOUT to GND through internal switch-critical for safe multi-rail sequencing |
| Undervoltage lockout (UVLO) | Hysteresis-free turn-on at ≥0.9V; prevents erratic startup from weak batteries or brown-out conditions |
Applications
| Portable Test Equipment | Palmtop Logic Supplies |
|---|---|
Use Scenario: Battery-powered handheld multimeters requiring stable 3.0V rail for microcontroller and ADC operation under variable load. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic voltage; manages dynamic load transients from measurement sampling bursts. Use Value: 95% efficiency extends battery life; PFM mode maintains >80% efficiency even during idle display refresh (≈1mA load). |
Use Scenario: Compact PDAs with ARM-based processors needing clean, low-noise 3.0V supply for memory and I/O interfaces. IC Role / Device Role / Timing Role: Local point-of-load regulator; SENSE pin placement ensures ±1% regulation at SoC VDD pins despite PCB resistance. Use Value: Programmable soft-start prevents reset glitches during cold boot; shutdown current <2.5µA enables weeks of standby time. |
| Portable Audio Systems | Electronic Organizers |
Use Scenario: MP3 players using flash storage and DACs, where ripple-sensitive analog stages demand low-noise 3.0V supply. IC Role / Device Role / Timing Role: Secondary regulator feeding audio codec; LX node layout minimizes radiated noise into adjacent analog traces. Use Value: 300kHz fixed frequency allows predictable EMI filtering; Schottky diode + 22µH inductor yields <20mVpp ripple with 47µF tantalum output cap. |
Use Scenario: Low-power organizers with LCD backlight and real-time clock, operating from two AA cells (2.4–3.2V nominal). IC Role / Device Role / Timing Role: Step-down controller maintaining regulated 3.0V across battery discharge curve; UVLO prevents malfunction below 2.4V. Use Value: Wide 1.8–10V input range accommodates fresh alkaline (3.2V) and depleted NiMH (2.0V) sources; EXTW timing simplifies external boost stage integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3MHz synchronous buck; 600mA; fixed 3.0V; no EXT/EXTW outputs; requires external compensation | Higher frequency enables smaller passives but increases switching loss at medium loads | Choose for space-constrained designs needing <1mm height; avoid if external P-MOSFET scaling or charge pump support is required |
| LM2675MX-3.0/NOPB | Fixed 3.0V, 1A buck; 260kHz; no PFM mode; higher quiescent current (5mA vs. 55µA) | Lacks light-load efficiency optimization and programmable soft-start | Prefer for industrial environments where wide temp range (-40°C to +125°C) and ruggedness outweigh battery-life needs |
Compared with TPS62231DRVR and LM2675MX-3.0/NOPB, TC120303EHATR uniquely combines PFM/PWM auto-switching, dual gate drives (EXT/EXTW), and charge pump support-making it optimal for portable systems requiring both high full-load efficiency and ultra-low shutdown current without sacrificing scalability.
Availability
TC120303EHATR is available at Aetrix Electronics and suitable for portable test equipment, palmtop logic supplies, and portable audio systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TC120303EHATR 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 facilities.
The TC120 product line was designed specifically for portable, battery-operated applications demanding high efficiency across wide load ranges, minimal external components, and flexible integration of internal or external power switches.
FAQ
What is the factory-set output voltage of the TC120303EHATR?
The TC120303EHATR is factory-programmed to deliver a nominal 3.0V output with ±2.5% tolerance over temperature and load. This value is fixed and non-adjustable via external resistors-the "303" in the part number explicitly denotes the 3.0V output variant. The SENSE pin must be connected directly to the load to maintain regulation accuracy within this specification.
Can the TC120303EHATR drive an external P-channel MOSFET, and what are the key drive requirements?
Yes, the TC120303EHATR supports external P-MOSFETs via its EXT and EXTW pins. EXT provides direct gate drive with ≤32Ω pull-up and ≤26Ω pull-down (at VOUT = 5V), capable of driving ≤1000pF gate capacitance. EXTW adds 100ns blanking for timing margin. For reliable operation, select a P-MOSFET with VGS(th) ≤ –2.5V, rDS(on) < 0.1Ω at VGS = –4.5V, and VDSS > VINMAX, such as the Si9430.
How does the soft-start function work on the TC120303EHATR, and what capacitor value is recommended?
The TC120303EHATR implements soft-start via an internal 1µA current source charging an external capacitor (CSS) connected to the SHDN/SS pin. A 4.7nF ceramic capacitor yields a typical 10ms ramp time, preventing output overshoot and inrush current. Values between 100pF and 4700pF are supported; undersized CSS risks instability, while oversized values delay startup unnecessarily.
What happens to the output voltage during shutdown of the TC120303EHATR?
During shutdown (SHDN/SS pulled low), the TC120303EHATR disables its oscillator and internal switching transistor, reduces supply current to ≤2.5µA, and activates an internal discharge switch connecting VOUT to GND. This actively discharges the output capacitor-ensuring rapid, controlled VOUT decay critical for safe power sequencing in multi-rail systems.
Does the TC120303EHATR include short-circuit protection, and how does it respond to overload?
Yes, the TC120303EHATR features autonomous short-circuit protection with a 5ms (typical) response time. When VOUT collapses near 0V, the device reduces PWM duty cycle to minimum, then initiates a timed shutdown. After a brief pause, it automatically re-engages soft-start-attempting recovery if the fault clears. No external latch or reset is needed.
TC120303EHATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
TC120303EHATR FAQ
1.How can I place an order for TC120303EHATR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC120303EHATR 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 TC120303EHATR reliable?
The price and inventory of TC120303EHATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC120303EHATR is usually 5 days.
3.What payment methods are accepted for TC120303EHATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC120303EHATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC120303EHATR?
TC120303EHATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC120303EHATR 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 TC120303EHATR?
For technical support, including TC120303EHATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC120303EHATR requirements.
6.How does Aetrix verify that TC120303EHATR is sourced from the original manufacturer or authorized distributors?
All TC120303EHATR 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 TC120303EHATR meets industry standards.
7.What is the process for return or replacement of TC120303EHATR?
All TC120303EHATR units undergo pre-shipment inspection (PSI). If there is an issue with TC120303EHATR, 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 TC120303EHATR part is unused and in its original packaging.
Return procedure for TC120303EHATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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