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Microchip Technology TC120333EHATR
- Part No.:
- TC120333EHATR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.173", 4.40mm Width)
- Datasheet:
-
TC120333EHATR.pdf
- Description:
- IC REG BUCK 3.3V 600MA 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,443
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Product details
Overview
TC120333EHATR from Microchip Technology is a 300kHz PFM/PWM step-down DC/DC regulator/controller optimized for 3.3V output at up to 600mA (VIN = 5V), featuring internal P-channel switching transistor, programmable soft-start, and automatic switchover to power-saving PFM mode at light loads. It delivers 95% typical efficiency and integrates undervoltage lockout, short-circuit protection, and output capacitor discharge during shutdown - deployed in portable test equipment and palmtop logic supplies.
For engineers reviewing the TC120333EHATR datasheet, TC120333EHATR pinout, TC120333EHATR application, or TC120333EHATR equivalent, key selection considerations include its 8-pin SOP package, 3.3V fixed output, 300kHz oscillator frequency, shutdown current of ≤2.5µA, and compatibility with external P-MOSFETs for >2A output capability.
Technical Context
The TC120333EHATR operates as either an integrated buck regulator (using its internal P-channel switch) or a controller (driving external P-MOSFETs via EXT/EXTW pins), supporting both PWM and automatic PFM mode transition based on load. Its architecture includes a charge-pump-capable CPC pin for gate-drive enhancement and dual drive outputs with 100ns blanking on EXTW to prevent shoot-through in external switch configurations.
It implements analog-based overcurrent detection with 3–8ms short-circuit response time, uses a 1µA internal current source for soft-start timing (6–16ms), and features dedicated SENSE pin for remote voltage regulation feedback - all while maintaining operation across –40°C to +85°C with input voltage range of 1.8V to 10V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% (factory-trimmed; supports tight regulation at point-of-load via SENSE pin) |
| Max Output Current | 600mA with internal switch; scalable to ≥2A using external P-MOSFET driven by EXT/EXTW |
| Oscillator Frequency | 300kHz (typical), enabling compact 22µH inductor selection and reduced EMI vs lower-frequency converters |
| Efficiency | 95% typical at full load (VIN = 5V → VOUT = 3.3V), enhanced by charge-pump circuitry on CPC pin |
| Shutdown Current | ≤2.5µA (max), with automatic output capacitor discharge and fast wake-up via SHDN/SS pin |
| Soft-Start Time | 6–16ms (programmable via external CSS capacitor on SHDN/SS pin) |
| UVLO Threshold | 1.8V (max), disabling operation below minimum input to prevent unstable regulation |
Pinout & Package
TC120333EHATR is housed in an industry-standard 8-pin Small Outline Package (SOP), measuring 4.90mm × 6.00mm × 1.75mm (0.193″ × 0.236″ × 0.069″), with gull-wing leads and Pin 1 marked by notch or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply rail | Accepts 1.8V–10V; powers internal circuitry and switching stage; requires local 47µF bypass capacitor |
| EXTW (Pin 2) | Extended gate drive output | Drives external P-MOSFET with 100ns leading/trailing edge blanking to prevent cross-conduction |
| CPC (Pin 3) | Charge pump capacitor node | Enables negative gate drive for internal P-FET to reduce RDS(ON); must be grounded if unused |
| SHDN/SS (Pin 4) | Combined shutdown control & soft-start node | Logic-low disables regulator and discharges VOUT; internal 1µA current source charges CSS for controlled ramp-up |
| SENSE (Pin 5) | Remote output voltage sensing input | 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, and LX return paths to minimize noise coupling |
| EXT (Pin 7) | Primary external gate drive output | Directly drives P-MOSFET gate; matches internal switch timing; rated for ≤1000pF capacitive load |
| LX (Pin 8) | Switching node / internal FET drain | Connects to inductor; carries high di/dt current; requires low-inductance layout and Kelvin connection to SENSE |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P-channel switch | Supports 600mA continuous output without external MOSFET; eliminates external high-side driver complexity |
| Automatic PFM/PWM mode transition | Reduces quiescent current at light loads while maintaining regulation - critical for battery-powered standby operation |
| Programmable soft-start | Prevents inrush current and output overshoot via external capacitor (100pF–4700pF) on SHDN/SS pin |
| Built-in short-circuit protection | Self-recovering 3–8ms response with automatic restart attempt after fault clearance - no latch-up or manual reset needed |
| Output capacitor discharge in shutdown | Internally pulls VOUT to GND during SHDN assertion - ensures safe power sequencing and prevents backfeed |
Applications
| Portable Test Equipment | Local Logic Supplies |
|---|---|
Use Scenario: Battery-powered handheld multimeters and signal generators requiring stable 3.3V for microcontrollers and ADCs. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated 3.3V from 2-cell Li-ion or alkaline stacks. Use Value: 95% efficiency extends battery life; PFM mode maintains µA-level quiescent draw during idle measurement cycles. |
Use Scenario: FPGA I/O banks and CPLD core rails in compact embedded controllers where space limits discrete solutions. IC Role / Device Role / Timing Role: Local point-of-load regulator with SENSE pin feedback ensuring <±1% voltage accuracy at the IC pad. Use Value: 8-pin SOP footprint minimizes PCB area; soft-start prevents logic glitches during power-up sequencing. |
| Portable Audio Systems | Palmtops |
Use Scenario: MP3 players and digital voice recorders needing low-noise 3.3V for audio codecs and flash memory interfaces. IC Role / Device Role / Timing Role: Buck converter operating in PFM mode during playback pause to suppress switching noise near sensitive analog stages. Use Value: 300kHz fixed frequency avoids audible band; integrated UVLO prevents brownout resets during battery sag. |
Use Scenario: Legacy PDAs and enterprise handhelds with dual-voltage logic (3.3V I/O, 1.8V core) powered from single-cell Li-ion. IC Role / Device Role / Timing Role: Main system regulator supplying 3.3V to display drivers, USB transceivers, and SD card slots. Use Value: Shutdown current ≤2.5µA enables multi-week standby; EXT/EXTW support allows future upgrade to higher-current variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1603-330I/SN | Fixed 3.3V output, 600mA, 500kHz switching, no EXT/EXTW pins, no CPC pin, smaller SOT-23-5 package | Lacks external switch support and charge-pump efficiency boost; suited only for ≤600mA standalone use | Select when board space is constrained and external MOSFET scalability is unnecessary |
| TPS62231DRVR | 3.3V output, 600mA, 3.6MHz switching, integrated synchronous rectification, 17µA quiescent current, no external switch option | Higher frequency enables smaller passives but increases EMI sensitivity; no PFM/PWM auto-switching | Choose for ultra-compact designs where high-frequency operation and low IQ outweigh need for external current scaling |
Compared with MCP1603-330I/SN and TPS62231DRVR, TC120333EHATR uniquely combines internal 600mA regulation with extensible >2A capability, PFM/PWM auto-transition, and charge-pump-enhanced efficiency - making it optimal for portable systems requiring both low-power standby and burst-mode high-current delivery.
Availability
TC120333EHATR is available at Aetrix Electronics and suitable for portable test equipment, local logic supplies, and palmtop power management requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for TC120333EHATR 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 TC120 product line was designed as a cost-optimized, flexible buck regulator/controller family for battery-powered and line-powered portable electronics - emphasizing efficiency across load ranges, minimal external component count, and robust protection features.
FAQ
What is the output voltage tolerance of the TC120333EHATR?
The TC120333EHATR provides a factory-programmed fixed 3.3V output with a tolerance of ±2.5% (VOUT = VR × 0.975 to VR × 1.025) under nominal conditions (IOUT = 132mA, TA = 25°C). This specification holds across its full operating temperature range (–40°C to +85°C) and input voltage range (1.8V to 10V), verified per DS21365C electrical characteristics table.
Can the TC120333EHATR drive an external P-channel MOSFET?
Yes, the TC120333EHATR can drive an external P-channel MOSFET using its EXT and EXTW pins. EXT provides direct gate drive synchronized with the internal switch, while EXTW adds 100ns blanking to prevent shoot-through. The device supports ≥2A output currents in this configuration, with recommended MOSFETs like the Si9430 cited in the datasheet for optimal RDS(ON) and gate charge matching.
How does the TC120333EHATR handle short-circuit conditions?
The TC120333EHATR detects output short circuits by monitoring VOUT collapse and initiates a self-recovering protection sequence: it reduces PWM duty cycle, triggers a 3–8ms internal timer, and shuts down if recovery fails. After shutdown, it automatically engages soft-start to attempt restart. If the fault persists, the cycle repeats - no latch-up or external intervention is required.
What is the purpose of the CPC pin on the TC120333EHATR?
The CPC (Charge Pump Capacitor) pin on the TC120333EHATR enables an external charge pump circuit (capacitor + diode) to pull the gate of the internal P-channel switch below ground, reducing RDS(ON) and improving high-load efficiency. When unused, CPC must be grounded. For VIN > 5V, a Zener clamp is required to limit |VCPC – VVIN| to ≤10V per datasheet Section 3.5.
Does the TC120333EHATR support remote voltage sensing?
Yes, the TC120333EHATR supports true remote voltage sensing via the SENSE pin (Pin 5), which must be connected directly to the load's power rail. This compensates for PCB trace resistance and ensures tight regulation (<±1%) at the point-of-load - critical for noise-sensitive logic and mixed-signal applications where local feedback would degrade accuracy.
TC120333EHATR 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):
- 3.3V
- 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
TC120333EHATR FAQ
1.How can I place an order for TC120333EHATR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC120333EHATR 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 TC120333EHATR reliable?
The price and inventory of TC120333EHATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC120333EHATR is usually 5 days.
3.What payment methods are accepted for TC120333EHATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC120333EHATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC120333EHATR?
TC120333EHATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC120333EHATR 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 TC120333EHATR?
For technical support, including TC120333EHATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC120333EHATR requirements.
6.How does Aetrix verify that TC120333EHATR is sourced from the original manufacturer or authorized distributors?
All TC120333EHATR 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 TC120333EHATR meets industry standards.
7.What is the process for return or replacement of TC120333EHATR?
All TC120333EHATR units undergo pre-shipment inspection (PSI). If there is an issue with TC120333EHATR, 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 TC120333EHATR part is unused and in its original packaging.
Return procedure for TC120333EHATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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