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Microchip Technology TC1303A-SI0EMF
- Part No.:
- TC1303A-SI0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303A-SI0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,742
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Product details
Overview
TC1303A-SI0EMF 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 90%+ efficiency at 2.0 MHz switching frequency, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature. Used in portable medical instruments requiring stable core and bias rails.
For engineers reviewing the TC1303A-SI0EMF datasheet, TC1303A-SI0EMF pinout, TC1303A-SI0EMF application, or TC1303A-SI0EMF equivalent, key selection criteria include buck/LDO output voltage configuration, PG monitoring scope (VOUT1 only), shutdown independence, thermal performance in 3×3 DFN, and compatibility with 1 µF LDO output capacitance.
Technical Context
The TC1303A-SI0EMF implements a fixed-frequency PWM buck stage with automatic transition to PFM mode under light load to maintain ultra-low IQ, while its LDO uses internal compensation and achieves 137 mV dropout at 200 mA. The power-good signal is an open-drain output tied exclusively to VOUT1 regulation with 300 ms delay, enabling reliable processor reset sequencing.
Its dual independent shutdown inputs (SHDN1 for buck, SHDN2 for LDO) allow granular power control, and both regulators feature undervoltage lockout (2.55 V nominal), overtemperature protection (165°C trip), and short-circuit current limiting - all within a single 10-pin 3×3 mm DFN package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA max - supports processor core rail with minimal external components |
| LDO Output Current | 300 mA max - powers auxiliary circuits like sensors or I/O interfaces |
| Switching Frequency | 2.0 MHz (±0.4 MHz) - enables compact 4.7 µH inductor and low-profile layout |
| Quiescent Current | 65 µA typical - extends battery life in always-on portable devices |
| PG Monitoring Target | VOUT1 only - ensures reset assertion only when primary buck output is valid |
| Dropout Voltage (LDO) | 137 mV @ 200 mA - maintains regulation even with tight input margins |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive-adjacent environments |
Pinout & Package
TC1303A-SI0EMF is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. Pin numbering follows standard DFN orientation (pin 1 top-left, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | Active-low enable for LDO output; logic threshold: <15% VIN (low), >45% VIN (high) |
| 2 | VIN2 | LDO input supply; must be tied closely to VIN1 to minimize noise coupling |
| 3 | VOUT2 | 300 mA LDO regulated output; requires ≥1 µF ceramic capacitor to AGND |
| 4 | PG | Open-drain power-good output monitoring VOUT1; pulled high externally for reset signaling |
| 5 | AGND | Analog ground reference; connects to system AGND plane and EP for thermal/EMI control |
| 6 | PGND | Power ground for buck switch node; separate from AGND to reduce noise injection |
| 7 | LX | Buck switch node; connects to external inductor and catch diode (integrated FETs) |
| 8 | VIN1 | Buck input supply (2.7–5.5 V); shared with VIN2 in most designs |
| 9 | SHDN1 | Active-low enable for buck regulator; independent control from SHDN2 |
| 10 | VFB1/VOUT1 | Feedback input for adjustable VOUT1 (0.8–4.5 V) or direct connection for fixed outputs |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck/LDO shutdown | Enables staged power-up/down and dynamic rail gating without firmware intervention |
| Internally compensated regulators | Eliminates need for external compensation networks - reduces BOM count and layout risk |
| 2.0 MHz fixed-frequency PWM | Minimizes EMI filtering requirements and allows use of small, low-DCR inductors |
| PG with 300 ms delay | Provides clean, debounced reset signal compatible with ARM Cortex-M and similar MCUs |
| Low-noise LDO output | 1.8 µV/√Hz output noise at 1 kHz supports noise-sensitive analog circuitry |
| Thermal & short-circuit protection | Auto-recovery shutdown at 165°C and current-limited LDO/buck outputs ensure robustness |
Applications
| Handheld Medical Instruments | USB-Powered Devices |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters operating from single-cell Li-ion or USB 5 V input. IC Role / Device Role / Timing Role: Generates 1.8 V core rail (buck) and 3.3 V sensor/I²C rail (LDO), with PG asserting MCU reset until both rails stabilize. Use Value: 65 µA IQ extends battery runtime beyond 72 hours; 137 mV LDO dropout ensures operation down to 3.4 V input. |
Use Scenario: USB-powered barcode scanners and wireless HID peripherals drawing <500 mA from host port. IC Role / Device Role / Timing Role: Provides regulated 1.2 V microcontroller core voltage and 2.5 V interface voltage, with independent shutdown for sleep/wake control. Use Value: 2.0 MHz switching avoids USB 1.5 MHz harmonics; open-drain PG simplifies level-shifting to 3.3 V logic. |
| Cellular Phones (Feature Phones) | Portable Computers (Sub-Notebooks) |
|
Use Scenario: Legacy GSM/GPRS handsets using discrete PMIC architecture with dual-rail requirements. IC Role / Device Role / Timing Role: Delivers 1.5 V RF transceiver bias and 2.8 V baseband processor supply, with PG monitoring only the higher-priority buck rail. Use Value: TC1303A variant's VOUT1-only PG alignment matches legacy reset timing specs without redesign. |
Use Scenario: Fanless industrial tablets powered by 3.7–4.2 V battery packs with strict thermal envelope. IC Role / Device Role / Timing Role: Supplies 0.8–1.2 V SoC core and 3.3 V peripheral rail, leveraging DFN thermal pad for passive cooling. Use Value: 41 °C/W θJA (DFN on 4-layer board) sustains 500 mA buck load at ≤75°C case temp without forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303B-SI0EMF | PG monitors LDO output (VOUT2) instead of buck output; same pinout and electrical specs | Used where auxiliary rail stability is critical for reset (e.g., memory retention circuits) | Select TC1303B-SI0EMF only if system reset must depend on VOUT2 regulation status |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO), 2.25 MHz switching, higher IQ (85 µA), QFN-24 package | Supports more complex SoC power trees; not drop-in due to pin count, footprint, and control logic | Choose TPS65023RGZR when adding a third rail or requiring I²C programmability outweighs BOM simplicity |
Compared with TC1303B-SI0EMF and TPS65023RGZR, TC1303A-SI0EMF offers the lowest component count and smallest footprint for applications where buck-rail integrity alone triggers system reset - ideal for cost- and space-constrained portable designs.
Availability
TC1303A-SI0EMF is available at Aetrix Electronics and suitable for handheld medical instruments, USB-powered devices, and cellular phones requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for TC1303A-SI0EMF 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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC1303 family was designed specifically for space-constrained portable electronics needing highly integrated, low-quiescent dual-rail power conversion - balancing efficiency, thermal performance, and ease of use in battery-powered systems.
FAQ
What is the power-good (PG) monitoring behavior of TC1303A-SI0EMF?
The TC1303A-SI0EMF monitors only the buck regulator output (VOUT1) for power-good assertion. Its open-drain PG pin activates after VOUT1 reaches 94% of target and remains asserted for ≥262 ms. This behavior is fixed per the TC1303A variant and differs from TC1303B (VOUT2-monitored) and TC1303C (dual-monitored). TC1303A-SI0EMF does not monitor the LDO output for PG.
Can TC1303A-SI0EMF support adjustable VOUT1 output voltages?
Yes, TC1303A-SI0EMF supports adjustable VOUT1 from 0.8 V to 4.5 V via external resistor divider connected to the VFB1/VOUT1 pin. The feedback reference voltage is tightly regulated at 0.8 V ±2.5%. Fixed-output versions (e.g., 1.2 V, 1.8 V) connect VOUT1 directly to VFB1; TC1303A-SI0EMF is the adjustable variant and requires external resistors for non-standard voltages.
What is the recommended output capacitance for the LDO (VOUT2) of TC1303A-SI0EMF?
The TC1303A-SI0EMF LDO output (VOUT2) requires a minimum 1 µF ceramic capacitor connected between VOUT2 and AGND for stability and transient response. Microchip specifies X5R or X7R dielectrics; larger values (e.g., 2.2 µF) improve load-step immunity but are not required. No ESR constraints apply - unlike many LDOs, TC1303A-SI0EMF is internally compensated and insensitive to capacitor ESR.
Does TC1303A-SI0EMF support independent enable/disable of buck and LDO outputs?
Yes, TC1303A-SI0EMF provides two independent active-low shutdown inputs: SHDN1 controls the buck regulator, and SHDN2 controls the LDO. Driving either pin low disables its respective regulator while leaving the other unaffected. This enables flexible power sequencing - for example, keeping the LDO active to power real-time clocks during buck shutdown. TC1303A-SI0EMF does not integrate sequencing logic like the TC1304.
What package type and thermal characteristics does TC1303A-SI0EMF use?
TC1303A-SI0EMF is supplied in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), designated "SI0EMF" in Microchip's ordering code. Its thermal resistance is θJA = 41 °C/W on a standard 4-layer PCB with internal ground plane and two vias under the EP. This enables continuous 500 mA buck output at ambient temperatures up to +75°C without forced airflow - a key advantage over MSOP-packaged variants (θJA = 113 °C/W).
TC1303A-SI0EMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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:
- 1.5V, 500mA
- Voltage/Current - Output 2:
- 2.5V, 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-SI0EMF FAQ
1.How can I place an order for TC1303A-SI0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-SI0EMF 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-SI0EMF reliable?
The price and inventory of TC1303A-SI0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-SI0EMF is usually 5 days.
3.What payment methods are accepted for TC1303A-SI0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-SI0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-SI0EMF?
TC1303A-SI0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-SI0EMF 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-SI0EMF?
For technical support, including TC1303A-SI0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-SI0EMF requirements.
6.How does Aetrix verify that TC1303A-SI0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303A-SI0EMF 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-SI0EMF meets industry standards.
7.What is the process for return or replacement of TC1303A-SI0EMF?
All TC1303A-SI0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-SI0EMF, 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-SI0EMF part is unused and in its original packaging.
Return procedure for TC1303A-SI0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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