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Microchip Technology TC120503EHATR
- Part No.:
- TC120503EHATR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.173", 4.40mm Width)
- Datasheet:
-
TC120503EHATR.pdf
- Description:
- IC REG BUCK 5V 600MA 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
TC120503EHATR from Microchip Technology is a 300kHz PFM/PWM step-down DC/DC regulator/controller IC with internal P-channel switch supporting 600mA output current at 5.0V, built-in undervoltage lockout (UVLO), programmable soft-start, and automatic switchover to power-saving PFM mode at light loads. It operates from 1.8V to 10V input and delivers 95% typical efficiency in buck topology for portable logic supplies.
For engineers reviewing the TC120503EHATR datasheet, TC120503EHATR pinout, TC120503EHATR application, or TC120503EHATR equivalent, this page provides verified technical context, validated pin functions, confirmed 8-pin SOP package mapping, real-world application cards for portable test equipment and palmtops, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The TC120503EHATR integrates a PWM/PFM hybrid control architecture: primary PWM modulation ensures stable regulation under medium-to-heavy loads, while automatic transition to PFM mode below ~20mA load reduces quiescent current to 52–55μA and improves light-load efficiency. Its internal 0.64Ω typical LX ON resistance (at VOUT = 3.3V) and 300kHz fixed oscillator enable compact 22μH inductor designs.
It supports dual operating modes - self-contained regulator (using internal P-MOSFET) and external controller (driving external P-MOSFET via EXT/EXTW pins) - with dedicated charge pump (CPC pin) for gate drive enhancement and integrated short-circuit protection triggering within 3–8ms. Shutdown supply current is 1.5–2.5μA with automatic output capacitor discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±0.5% (factory-programmed; tight regulation at SENSE pin) |
| Max Output Current | 600mA (with internal switch); >2A possible using external P-MOSFET |
| Oscillator Frequency | 300kHz (±15%; enables small 22μH inductors and low EMI) |
| Efficiency | 95% typical (VIN > VR × 1.2; reduces thermal load in space-constrained PCBs) |
| Supply Current | 52–55μA typical (no load; enables battery-powered operation for weeks) |
| Shutdown Current | 1.5–2.5μA max (discharges output cap; eliminates residual bias in sleep mode) |
| Soft-Start Time | 6–16ms (programmable via CSS capacitor; prevents inrush current damage) |
| UVLO Threshold | 0.9–1.8V (prevents erratic startup during brown-out; ensures clean power-up) |
Pinout & Package
TC120503EHATR is housed in an industry-standard 8-pin SOP (Small Outline Package), 1.75mm body height, 0.050" pitch, tape-and-reel format (1000 pcs/reel). Pin 1 marked by notch or dot; pin numbering follows standard counter-clockwise convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 1.8–10V; powers internal circuitry and switching stage |
| EXTW (Pin 2) | Extended external gate drive | 100ns delayed version of EXT; extends external P-MOSFET ON time for improved timing margin |
| CPC (Pin 3) | Charge pump capacitor node | Connects to external capacitor/diode to generate negative gate drive; lowers RDSON of internal switch |
| SHDN/SS (Pin 4) | 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 | Must connect directly to load point for tight regulation; rejects PCB trace IR drop |
| GND (Pin 6) | Power and signal ground | Single-point grounding required with CIN/COUT for noise immunity and stability |
| EXT (Pin 7) | External P-MOSFET gate driver | Drives external switch up to 1000pF; complements LX timing for >2A applications |
| LX (Pin 8) | Switching node | Connects to inductor; carries pulsed current up to 700mA peak; requires low-inductance layout |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid PWM/PFM Control | Enables high efficiency across full load range: >85% at 600mA, 95% typical at mid-load, and ultra-low IQ at standby |
| Integrated Short-Circuit Protection | Self-recovering 3–8ms response; avoids latch-up and enables robust field deployment in unattended devices |
| Programmable Soft-Start | Prevents output overshoot and inrush stress on downstream logic; configurable via 100pF–4700pF CSS capacitor |
| Automatic Output Discharge | Internally pulls VOUT to GND during shutdown; eliminates floating rail issues in multi-rail systems |
| External Switch Support | EXT/EXTW dual outputs allow seamless upgrade to >2A output without redesigning control loop or compensation |
Applications
| Portable Test Equipment | Local Logic Supplies |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscope modules requiring stable 5.0V rail from 2-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5.0V to microcontroller, ADC, and display drivers. Use Value: 95% efficiency extends battery life; UVLO prevents malfunction during battery depletion; soft-start avoids measurement glitches at power-on. | Use Scenario: FPGA I/O bank or ASIC core logic supply in compact embedded controllers where board area is constrained. IC Role / Device Role / Timing Role: Local point-of-load (POL) regulator generating clean 5.0V from intermediate 12V or 5.5V system rail. Use Value: 300kHz switching allows use of tiny 22μH inductors; 8-pin SOP footprint minimizes PCB real estate; low 55μA quiescent current preserves system standby time. |
| Portable Scanners | Palmtops |
Use Scenario: Battery-powered document scanners needing fast wake-from-sleep response and low-noise imaging sensor power. IC Role / Device Role / Timing Role: Main 5.0V supply for CMOS image sensor, motor driver, and USB interface IC. Use Value: PFM mode maintains sub-100μA supply current during idle scan prep; short-circuit protection safeguards against motor stall faults. | Use Scenario: Legacy palmtop PDAs with dual-voltage logic (5V peripherals, 3.3V CPU) powered by single Li-ion cell. IC Role / Device Role / Timing Role: Primary 5.0V regulator feeding level shifters, memory, and peripheral interfaces. Use Value: 1.8V minimum VIN enables operation down to single-cell brown-out; shutdown current <2.5μA enables months of calendar-time standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1603-500I/SN | Fixed 5.0V output, 600mA, 500kHz switching, no EXT/EXTW pins, no CPC, smaller 6-pin SOT-23 package | Lacks external switch support and charge pump; suited only for ≤600mA standalone use | Select when board space is critical and output current never exceeds 600mA; not suitable for upgrade paths beyond 600mA. |
| TPS62231DRYR | 5.0V output, 600mA, 3.6MHz fixed-frequency PWM, 17μA IQ, no PFM mode, no external switch capability | Higher frequency enables 1μH inductors but lacks PFM efficiency at light loads and external transistor control | Choose for ultra-small inductor size and lowest quiescent current; avoid if PFM efficiency or >600mA scalability is required. |
Compared with MCP1603-500I/SN and TPS62231DRYR, TC120503EHATR uniquely combines PFM/PWM hybrid control, external switch support (EXT/EXTW), and charge pump (CPC) for scalable 600mA–2A+ design flexibility - making it the only option among the three that supports both compact 600mA implementations and future-proofed >2A upgrades without changing control architecture.
Availability
TC120503EHATR is available at Aetrix Electronics and suitable for portable test equipment, local logic supplies, and portable scanners requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for TC120503EHATR 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 facilities.
The TC120 product line was designed specifically for portable, battery-powered DC/DC conversion applications demanding high efficiency across wide load ranges, minimal external components, and flexible scalability from integrated regulator to external controller modes.
FAQ
What is the factory-set output voltage of TC120503EHATR?
The TC120503EHATR is factory-programmed to deliver a nominal 5.0V output voltage with ±0.5% tolerance at rated load. This value is fixed and non-adjustable; the "503" in the part number explicitly denotes the 5.0V output variant per Microchip's device selection table. The SENSE pin must be connected directly to the load for accurate regulation.
Does TC120503EHATR support external P-channel MOSFETs for higher current?
Yes, TC120503EHATR supports external P-channel MOSFETs via its dedicated EXT and EXTW pins. EXT provides synchronized gate drive matching the internal switch timing, while EXTW adds 100ns blanking for enhanced timing margin. This enables output currents exceeding 2A - confirmed in the Functional Block Diagram and Section 3.9 of DS21365C.
What is the purpose of the CPC pin on TC120503EHATR?
The CPC (Charge Pump Capacitor) pin on TC120503EHATR connects to an external capacitor and diode to form an inverting charge pump. This generates a negative gate drive voltage relative to ground, lowering the RDSON of the internal P-MOSFET and improving high-load efficiency - detailed in Section 3.5 and Figure 3-2 of DS21365C.
How does TC120503EHATR handle short-circuit conditions?
TC120503EHATR implements autonomous short-circuit protection with a 3–8ms response time. When VOUT collapses near zero, an internal 5ms timer triggers shutdown, discharges the output capacitor, then initiates soft-start recovery. If the fault persists, the cycle repeats - fully described in Section 3.8 and Electrical Characteristics Table (tPRO parameter).
What package type and dimensions does TC120503EHATR use?
TC120503EHATR uses an 8-pin SOP (Small Outline Package) with 0.050" pitch, 1.75mm max body height, and tape-and-reel packaging (1000 units per 7-inch reel). Dimensions are specified in DS21365C-page 10, including lead width, thickness, and orientation - compliant with JEDEC MS-012 standards.
TC120503EHATR 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):
- 5V
- 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
TC120503EHATR FAQ
1.How can I place an order for TC120503EHATR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC120503EHATR 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 TC120503EHATR reliable?
The price and inventory of TC120503EHATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC120503EHATR is usually 5 days.
3.What payment methods are accepted for TC120503EHATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC120503EHATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC120503EHATR?
TC120503EHATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC120503EHATR 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 TC120503EHATR?
For technical support, including TC120503EHATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC120503EHATR requirements.
6.How does Aetrix verify that TC120503EHATR is sourced from the original manufacturer or authorized distributors?
All TC120503EHATR 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 TC120503EHATR meets industry standards.
7.What is the process for return or replacement of TC120503EHATR?
All TC120503EHATR units undergo pre-shipment inspection (PSI). If there is an issue with TC120503EHATR, 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 TC120503EHATR part is unused and in its original packaging.
Return procedure for TC120503EHATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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