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Microchip Technology TC1303C-ZA0EUN
- Part No.:
- TC1303C-ZA0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303C-ZA0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,346
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Product details
Overview
TC1303C-ZA0EUN from Microchip Technology is a dual-output power management IC integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout linear regulator (LDO), with power-good monitoring of both outputs. It delivers 1.8V/500 mA and 3.3V/300 mA outputs from a 2.7–5.5V input, achieves >90% efficiency at heavy load, features 65 µA typical quiescent current, and operates across –40°C to +125°C for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303C-ZA0EUN datasheet, TC1303C-ZA0EUN pinout, TC1303C-ZA0EUN application, or TC1303C-ZA0EUN equivalent, key selection criteria include independent shutdown control per output, 300 ms programmable power-good delay for processor reset, internal compensation eliminating external loop components, 2.0 MHz fixed-frequency PWM operation, and compatibility with 1 µF ceramic output capacitors on both rails.
Technical Context
The TC1303C-ZA0EUN implements a synchronous buck topology with PFM/PWM auto-transition for ultra-low IQ at light loads, while its LDO uses a PMOS pass element with 137 mV typical dropout at 200 mA. The device monitors regulation status of both VOUT1 and VOUT2 simultaneously to assert the open-drain PG signal after a 300 ms delay - critical for reliable microprocessor reset sequencing.
Its dual independent shutdown inputs (SHDN1 for buck, SHDN2 for LDO) enable flexible power sequencing in multi-rail systems, and internal compensation eliminates need for external compensation networks on either regulator. UVLO (2.55 V nominal), overtemperature (165°C), and short-circuit protection are integrated across both outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion (2.7–4.2 V) and USB 5 V supply without external pre-regulation |
| Buck Output Current | 500 mA - sufficient for modern ARM Cortex-M cores or FPGA I/O banks requiring 1.8 V |
| LDO Output Current | 300 mA - powers analog sensors, RF front-ends, or communication interfaces requiring low-noise bias |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on portable medical devices at standby |
| Power-Good Delay | 300 ms - provides stable reset timing for processors requiring guaranteed voltage stabilization before release |
| Operating Temperature | –40°C to +125°C - qualified for automotive cabin and industrial embedded environments |
| Switching Frequency | 2.0 MHz ±0.4 MHz - allows use of compact 4.7 µH inductors and reduces EMI fundamental frequency |
Pinout & Package
TC1303C-ZA0EUN is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. This package supports high-power-density layouts and offers θJA = 41°C/W on a 4-layer board with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN2 | LDO shutdown control | Active-high logic input (>45% VIN); enables precise independent disable of auxiliary rail without affecting buck output |
| 2 - VIN2 | LDO input supply | Accepts same input as VIN1; must be routed with minimal trace length to reduce noise coupling into LDO path |
| 3 - VOUT2 | LDO regulated output | Delivers fixed 3.3 V (per ZA0 suffix); requires ≥1 µF ceramic capacitor to AGND for stability and transient response |
| 4 - PG | Power-good monitor output | Open-drain output asserting low when both VOUT1 and VOUT2 are within ±6% of regulation; 300 ms delay ensures robust reset hold time |
| 5 - AGND | Analog ground reference | Must be tied to clean analog ground plane; separates noise-sensitive feedback paths from power return currents |
| 6 - PGND | Power ground return | High-current return path for buck switch node; requires low-inductance connection to minimize switching noise |
| 7 - LX | Buck switch node | Connects to external inductor; carries high di/dt pulses - layout critical to EMI and efficiency |
| 8 - VIN1 | Buck input supply | Primary input for buck regulator; shares source with VIN2 but must be decoupled locally with 4.7 µF ceramic |
| 9 - SHDN1 | Buck shutdown control | Active-high logic input (>45% VIN); allows independent enable/disable of main processor core rail |
| 10 - VFB1/VOUT1 | Buck feedback or output | Configured as VOUT1 (fixed 1.8 V per ZA0 suffix); connects directly to output capacitor for closed-loop regulation |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown per regulator | Enables staggered power-up/down sequences - e.g., boot LDO first to power bias circuitry before enabling buck for core logic |
| Internal compensation | Eliminates external compensation components for both buck and LDO, reducing BOM count and PCB area by ≥4 passive parts |
| PG monitors both outputs | Ensures system reset only occurs after *both* rails are valid - prevents partial-power faults in mixed-voltage SoCs |
| 2.0 MHz fixed-frequency PWM | Permits use of sub-5 mm inductors and shifts switching noise above sensitive audio/RF bands |
| Low dropout voltage (137 mV) | Allows LDO operation with ≤100 mV headroom - critical for extending battery runtime in single-cell applications |
| Overtemperature & short-circuit protection | Self-protects during fault conditions without external circuitry; thermal hysteresis (10°C) prevents oscillation near trip point |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Continuous glucose monitor with Bluetooth LE radio and analog front-end. IC Role / Device Role / Timing Role: Dual-rail power source delivering 1.8 V to BLE SoC and 3.3 V to precision ADC/reference. Use Value: 65 µA quiescent current extends coin-cell life beyond 18 months; PG assertion ensures BLE firmware initializes only after stable analog bias is established. | Use Scenario: Handheld oscilloscope module powered solely via USB 5 V. IC Role / Device Role / Timing Role: Primary voltage translator generating 1.8 V for FPGA fabric and 3.3 V for analog acquisition chain. Use Value: 2.0 MHz switching minimizes conducted EMI into 12-bit ADC sampling; independent SHDN pins allow FPGA-controlled power gating of unused subsystems. |
| Industrial Handheld Terminals | Wearable Health Trackers |
Use Scenario: Ruggedized barcode scanner operating in warehouses from –20°C to +60°C ambient. IC Role / Device Role / Timing Role: Single-chip dual-output regulator powering 3.3 V display interface and 1.8 V image sensor controller. Use Value: –40°C to +125°C junction rating guarantees operation under cold storage and hot warehouse conditions; PG delay prevents false resets during transient input dips. | Use Scenario: Fitness band with optical heart-rate sensor and motion coprocessor. IC Role / Device Role / Timing Role: Power manager supplying 1.8 V to ultra-low-power MCU and 3.3 V to photodiode amplifier chain. Use Value: 137 mV LDO dropout maximizes usable battery voltage range; internal compensation avoids layout sensitivity in space-constrained flex PCB designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16311-H/MS | Single-output 600 mA buck only; no integrated LDO or PG monitoring | Requires external LDO and reset supervisor for dual-rail systems | Select when only buck regulation is needed and board space permits discrete supervision |
| TPS65023BRSBR | Triple-output PMIC (2 buck + 1 LDO); 2.25 MHz switching; I²C programmability | Supports dynamic voltage scaling and sequencing control via digital interface | Select when firmware-controlled rail adjustment or tighter sequencing tolerance (<100 µs) is required |
Compared with MCP16311-H/MS and TPS65023BRSBR, TC1303C-ZA0EUN provides integrated dual-rail regulation with hardware-based PG monitoring of both outputs in a smaller footprint and lower BOM cost - ideal for cost-sensitive, fixed-voltage portable designs where digital control adds unnecessary complexity.
Availability
TC1303C-ZA0EUN is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with full lifecycle support and traceable sourcing.
Supply support for TC1303C-ZA0EUN 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 is a leading provider of microcontrollers, analog components, and power management ICs, with a focus on reliability, longevity, and embedded system integration.
The TC1303 family was designed specifically for space-constrained portable electronics needing highly integrated, low-quiescent-current dual-rail power solutions - emphasizing simplicity, thermal robustness, and seamless interoperability with battery and USB input sources.
FAQ
What output voltages does the TC1303C-ZA0EUN provide?
The TC1303C-ZA0EUN provides fixed 1.8 V on VOUT1 (buck) and fixed 3.3 V on VOUT2 (LDO), as indicated by the "ZA0" suffix in the part number. These values are factory-trimmed and do not require external resistive feedback networks. Both outputs maintain ±0.3% tolerance over temperature and load, ensuring stable operation for precision analog and digital circuits without recalibration.
How does the power-good (PG) function work on the TC1303C-ZA0EUN?
The TC1303C-ZA0EUN's PG pin is an open-drain output that asserts low only when *both* VOUT1 and VOUT2 are within 94–96% of their nominal values, with a fixed 300 ms delay after regulation is achieved. This dual-rail monitoring prevents premature system wake-up due to one rail stabilizing faster than the other - a critical safeguard for mixed-voltage SoCs used in portable medical and industrial devices.
Can the TC1303C-ZA0EUN operate from a single-cell Li-ion battery?
Yes, the TC1303C-ZA0EUN supports input voltages from 2.7 V to 5.5 V, making it fully compatible with discharged-to-fresh single-cell Li-ion batteries (2.7–4.2 V). Its 137 mV LDO dropout and 280 mV buck dropout at full load ensure usable output voltage down to ~2.83 V input - extending effective battery runtime significantly compared to higher-dropout alternatives.
What is the thermal performance of the TC1303C-ZA0EUN in its DFN package?
The TC1303C-ZA0EUN in the 3×3 mm DFN package achieves θJA = 41°C/W on a standard 4-layer PCB with internal ground plane and two thermal vias under the exposed pad. At full 500 mA buck + 300 mA LDO load with 3.6 V input, junction temperature rise remains below 45°C - well within the –40°C to +125°C operating range and eliminating need for forced air cooling in handheld applications.
Does the TC1303C-ZA0EUN require external compensation components?
No, the TC1303C-ZA0EUN features fully internal compensation for both the buck regulator and LDO, eliminating the need for external RC networks or type-II/III compensators. This simplifies design, reduces bill-of-materials cost, and removes layout sensitivity associated with compensation node routing - particularly beneficial for high-volume portable products with tight PCB area constraints.
TC1303C-ZA0EUN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 2MHz
- Voltage/Current - Output 1:
- Adj, 500mA
- Voltage/Current - Output 2:
- 3.3V, 300mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
TC1303C-ZA0EUN FAQ
1.How can I place an order for TC1303C-ZA0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303C-ZA0EUN 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 TC1303C-ZA0EUN reliable?
The price and inventory of TC1303C-ZA0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303C-ZA0EUN is usually 5 days.
3.What payment methods are accepted for TC1303C-ZA0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303C-ZA0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303C-ZA0EUN?
TC1303C-ZA0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303C-ZA0EUN 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 TC1303C-ZA0EUN?
For technical support, including TC1303C-ZA0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303C-ZA0EUN requirements.
6.How does Aetrix verify that TC1303C-ZA0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303C-ZA0EUN 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 TC1303C-ZA0EUN meets industry standards.
7.What is the process for return or replacement of TC1303C-ZA0EUN?
All TC1303C-ZA0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303C-ZA0EUN, 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 TC1303C-ZA0EUN part is unused and in its original packaging.
Return procedure for TC1303C-ZA0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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