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Microchip Technology TC1303A-ZA0EMFTR
- Part No.:
- TC1303A-ZA0EMFTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303A-ZA0EMFTR.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,732
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Product details
Overview
TC1303A-ZA0EMFTR 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 the buck output only. It delivers 1.2V @ 500 mA and 2.5V @ 300 mA from a 2.7–5.5V input, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303A-ZA0EMFTR datasheet, TC1303A-ZA0EMFTR pinout, TC1303A-ZA0EMFTR application, or TC1303A-ZA0EMFTR equivalent, key selection criteria include buck/LDO independent shutdown control, open-drain PG tied to VOUT1 regulation, 137 mV LDO dropout at 200 mA, DFN-10 (3×3 mm) package thermal resistance of 41°C/W, and compatibility with ceramic output capacitors as small as 1 µF on VOUT2.
Technical Context
The TC1303A-ZA0EMFTR implements a synchronous buck stage with integrated P- and N-channel MOSFETs (RDS(on) = 450 mΩ each), fixed 2.0 MHz switching frequency under heavy load, and automatic transition to PFM mode at light loads to maintain ultra-low IQ. Its LDO stage uses internal compensation and achieves ±0.3% output voltage tolerance with 25 ppm/°C temperature coefficient.
Power-good logic monitors only the buck output (VOUT1), asserting PG after a 300 ms delay once VOUT1 reaches 94% of its nominal value; PG is open-drain with 0.2 V low-level output at 1.2 mA sink. UVLO activates below 2.55 V (typical) with 200 mV hysteresis, and thermal shutdown engages at 165°C with 10°C hysteresis.
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 rails without external pre-regulation. |
| Buck Output Current | 500 mA - sufficient to power ARM Cortex-M cores or FPGA I/O banks requiring regulated 1.2 V or 1.8 V. |
| LDO Output Current | 300 mA - drives analog sensors, RF front-ends, or USB PHYs requiring low-noise 2.5 V or 3.3 V bias. |
| Quiescent Current | 65 µA typical - enables >10-year battery life in always-on wearable medical monitors. |
| LDO Dropout Voltage | 137 mV @ 200 mA - allows operation with <100 mV headroom above output, critical for low-VIN applications. |
| PG Delay & Threshold | 300 ms delay; 94% VOUT1 threshold - provides reliable processor reset timing aligned with core voltage stabilization. |
| Operating Temperature | –40°C to +125°C junction - qualified for industrial and automotive cabin-temperature embedded systems. |
Pinout & Package
TC1303A-ZA0EMFTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. The package supports high-power-density layouts and achieves θJA = 41°C/W on a 4-layer PCB with internal ground plane and two vias under the EP.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | Active-high enable for LDO only; logic-high (>45% VIN) activates VOUT2, enabling independent power sequencing. |
| 2 | VIN2 | Dedicated LDO input; must be tied closely to VIN1 to minimize noise coupling between buck and LDO stages. |
| 3 | VOUT2 | LDO regulated output; requires ≥1 µF ceramic capacitor to AGND for stability and transient response. |
| 4 | PG | Open-drain power-good output monitoring VOUT1; pulled up externally to indicate buck regulation status. |
| 5 | AGND | Analog ground reference; must be routed separately from PGND and connected to EP for optimal noise immunity. |
| 6 | PGND | Power ground for buck switch node; connects to LX return path and must be low-inductance to suppress EMI. |
| 7 | LX | Switch node connecting internal MOSFETs; requires careful layout to minimize ringing and EMI radiation. |
| 8 | VIN1 | Main buck input supply; shared with VIN2 via short trace to reduce input impedance and ripple coupling. |
| 9 | SHDN1 | Active-high enable for buck regulator only; allows independent control of VOUT1 before or after VOUT2 startup. |
| 10 | VFB1/VOUT1 | Feedback input for adjustable VOUT1 or direct connection point for fixed-output versions (e.g., 1.2 V). |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 pins allow staggered startup/shutdown of buck and LDO outputs-critical for FPGA or SoC power sequencing. |
| Internally compensated LDO | Eliminates need for external compensation network; reduces BOM count and board area while ensuring stability with 1 µF ceramic output cap. |
| 2.0 MHz fixed-frequency PWM | Enables use of compact 4.7 µH inductors and 4.7 µF ceramic input/output caps-ideal for space-constrained portable designs. |
| Automatic PWM-to-PFM transition | Maintains high efficiency (>85%) down to 1 mA load without requiring external mode-control circuitry or firmware intervention. |
| Open-drain PG tied to VOUT1 | Provides processor reset signal synchronized to core voltage rail only-ensures deterministic boot timing in multi-rail systems. |
| Integrated protection | Includes undervoltage lockout (2.55 V typ), overtemperature shutdown (165°C), and short-circuit current limiting (240 mA avg on LDO). |
Applications
| USB-Powered Portable Instrument | Handheld Medical Monitor |
|---|---|
|
Use Scenario: A battery-backed pulse oximeter powered via USB during clinical docking, requiring clean 1.2 V for MCU and 2.5 V for analog front-end. IC Role / Device Role / Timing Role: TC1303A-ZA0EMFTR supplies dual regulated rails with independent enable control and PG assertion to synchronize MCU boot with analog sensor readiness. Use Value: 137 mV LDO dropout enables full 2.5 V output even as Li-ion voltage drops to 2.8 V; 65 µA IQ extends runtime between charges. |
Use Scenario: An FDA-class II handheld ECG device operating from single-cell Li-ion, needing low-noise 3.3 V for ADC and 1.8 V for digital logic. IC Role / Device Role / Timing Role: TC1303A-ZA0EMFTR's buck stage powers the 1.8 V domain with >90% efficiency, while its LDO delivers 3.3 V with 62 dB PSRR at 100 Hz for ADC reference stability. Use Value: Open-drain PG tied to buck output ensures MCU reset occurs only after stable 1.8 V is established-preventing corrupted ECG data capture. |
| Industrial Sensor Node | Embedded Point-of-Sale Terminal |
|
Use Scenario: A wireless temperature/humidity sensor node deployed in factory environments with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: TC1303A-ZA0EMFTR regulates 5 V USB input to 3.3 V (LDO) for RF transceiver and 1.2 V (buck) for microcontroller, with thermal shutdown at 165°C. Use Value: –40°C to +125°C junction rating and 41°C/W thermal resistance ensure reliable operation inside sealed enclosures without forced air cooling. |
Use Scenario: A compact retail terminal using USB-C PD input (5 V) to power display backlight driver (3.3 V) and secure element (1.2 V). IC Role / Device Role / Timing Role: TC1303A-ZA0EMFTR's independent SHDN1/SHDN2 pins allow controlled power-up sequence: display rail first, then secure element, avoiding bus contention. Use Value: Fixed 2.0 MHz switching frequency minimizes conducted EMI into sensitive touch-screen controller circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16321-3302H/DC | Single-output 3.3 V buck only; no integrated LDO or PG; 1.2 MHz switching; 40 µA IQ | Requires external LDO and reset supervisor for dual-rail systems; lacks VOUT1-monitored PG | Select when only one regulated rail is needed and lowest possible IQ is critical; not a functional substitute for TC1303A-ZA0EMFTR. |
| TPS62231DRYT | Single-output 1.2 V buck with 2.25 MHz switching; 17 µA IQ; no LDO; no PG; 300 mA output | Cannot replace dual-output functionality; requires separate LDO and supervisor ICs for equivalent system function | Choose only for cost-sensitive, single-rail applications where footprint and IQ outweigh integration benefits. |
Compared with MCP16321-3302H/DC and TPS62231DRYT, TC1303A-ZA0EMFTR uniquely integrates buck + LDO + VOUT1-monitored PG in one 3×3 mm DFN, eliminating three discrete components and associated layout complexity while maintaining 65 µA IQ and –40°C to +125°C operation.
Availability
TC1303A-ZA0EMFTR is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for TC1303A-ZA0EMFTR 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 design-in support for industrial and automotive markets.
The TC1303 family was designed specifically for space-constrained portable electronics requiring dual regulated supplies with minimal external components, low quiescent current, and robust thermal performance.
FAQ
What output voltages does the TC1303A-ZA0EMFTR provide?
The TC1303A-ZA0EMFTR is a fixed-output variant delivering 1.2 V from its buck regulator (VOUT1) and 2.5 V from its LDO (VOUT2). These values are laser-trimmed at wafer test and specified with ±0.3% tolerance across temperature. The part number suffix "ZA" denotes this specific dual-voltage configuration, confirmed in Microchip's DS21949C datasheet Table 1-1.
How does the power-good (PG) output behave on the TC1303A-ZA0EMFTR?
The TC1303A-ZA0EMFTR features an open-drain PG output that monitors only the buck regulator output (VOUT1). It asserts low after a 300 ms delay once VOUT1 reaches 94% of its nominal value and deasserts when VOUT1 falls below 92%. PG requires an external pull-up resistor and is compatible with 1.8 V, 3.3 V, or 5 V logic interfaces, as verified in DS21949C-page 9 electrical characteristics.
Can the TC1303A-ZA0EMFTR operate from a single Li-ion cell?
Yes - the TC1303A-ZA0EMFTR supports input voltages from 2.7 V to 5.5 V, matching the discharge curve of a standard single-cell Li-ion battery (2.7–4.2 V). Its 137 mV LDO dropout at 200 mA and 280 mV buck dropout at 500 mA ensure both outputs remain regulated down to 2.83 V input for 2.5 V VOUT2 and 3.58 V for 3.3 V VOUT1, per DS21949C-page 8 specifications.
What is the thermal performance of the TC1303A-ZA0EMFTR in its DFN package?
The TC1303A-ZA0EMFTR in the 10-pin 3×3 mm DFN package achieves a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the exposed pad. This allows continuous 500 mA buck output at +85°C ambient with ≤35°C junction rise, validated in DS21949C-page 10 thermal specifications.
Does the TC1303A-ZA0EMFTR require external compensation components?
No - both the buck regulator and LDO in the TC1303A-ZA0EMFTR are internally compensated. The buck stage uses a fixed-frequency current-mode architecture that remains stable with standard 4.7 µH inductors and 4.7 µF ceramic input/output capacitors. The LDO requires only a 1 µF ceramic capacitor on VOUT2, as confirmed in DS21949C-page 5 typical application circuits and page 8 DC characteristics.
TC1303A-ZA0EMFTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-DFN (3x3)
TC1303A-ZA0EMFTR FAQ
1.How can I place an order for TC1303A-ZA0EMFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-ZA0EMFTR 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 TC1303A-ZA0EMFTR reliable?
The price and inventory of TC1303A-ZA0EMFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-ZA0EMFTR is usually 5 days.
3.What payment methods are accepted for TC1303A-ZA0EMFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-ZA0EMFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-ZA0EMFTR?
TC1303A-ZA0EMFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-ZA0EMFTR 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 TC1303A-ZA0EMFTR?
For technical support, including TC1303A-ZA0EMFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-ZA0EMFTR requirements.
6.How does Aetrix verify that TC1303A-ZA0EMFTR is sourced from the original manufacturer or authorized distributors?
All TC1303A-ZA0EMFTR 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 TC1303A-ZA0EMFTR meets industry standards.
7.What is the process for return or replacement of TC1303A-ZA0EMFTR?
All TC1303A-ZA0EMFTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-ZA0EMFTR, 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 TC1303A-ZA0EMFTR part is unused and in its original packaging.
Return procedure for TC1303A-ZA0EMFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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