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Microchip Technology TC1303B-SP0EMF
- Part No.:
- TC1303B-SP0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-SP0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,270
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Product details
Overview
TC1303B-SP0EMF 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 LDO output only. It delivers 1.8 V @ 500 mA and 2.5 V @ 300 mA from a 2.7–5.5 V input, features 65 µA typical quiescent current, 2.0 MHz fixed-frequency PWM operation, and operates across –40°C to +125°C junction temperature. It targets portable battery-powered systems requiring tightly regulated dual rails.
For engineers reviewing the TC1303B-SP0EMF datasheet, TC1303B-SP0EMF pinout, TC1303B-SP0EMF application, or TC1303B-SP0EMF equivalent, key selection criteria include LDO-monitored PG behavior, independent SHDN2 control, 137 mV dropout at 200 mA, internal compensation, and DFN/MSOP package compatibility for space-constrained designs.
Technical Context
The TC1303B-SP0EMF implements a synchronous buck stage with PFM/PWM auto-transition and an independently controllable LDO stage. Its power-good output is a push-pull signal triggered exclusively by VOUT2 regulation (94% threshold, 300 ms delay), distinguishing it from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored). The buck regulator uses internal 450 mΩ P- and N-channel MOSFETs and operates at 2.0 MHz ±20% over temperature and input voltage.
Both regulators are internally compensated and require no external compensation components. The LDO accepts up to 5.5 V input and maintains ±0.3% output voltage tolerance over load and temperature; its 1 µF ceramic output capacitor requirement minimizes board area. UVLO (2.55 V typ), thermal shutdown (165°C), and short-circuit protection are integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 Type | Synchronous buck regulator, adjustable (0.8–4.5 V) or fixed (e.g., 1.8 V), 500 mA max |
| Output 2 Type | Low-dropout linear regulator, fixed (e.g., 2.5 V), 300 mA max, 137 mV dropout @ 200 mA |
| Power-Good Logic | Push-pull output monitoring only VOUT2 with 94% threshold and 300 ms delay - enables processor reset sequencing |
| Quiescent Current | 65 µA typical total device IQ - critical for battery runtime in always-on subsystems |
| Switching Frequency | 2.0 MHz fixed PWM (heavy load), auto-transition to PFM (light load) - enables small 4.7 µH inductor and low EMI |
| Operating Temp | –40°C to +125°C junction - supports industrial and automotive under-hood ambient conditions |
| Package | 10-pin 3×3 mm DFN (exposed pad to AGND) - high thermal performance (θJA = 41°C/W) |
Pinout & Package
TC1303B-SP0EMF is housed in a 10-lead 3×3 mm DFN package with exposed thermal pad connected to AGND. Pin numbering follows standard DFN orientation (pin 1 top-left, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control input | Active-high logic (>45% VIN); enables/disables only VOUT2 - allows independent LDO sequencing |
| 2 (VIN2) | LDO input supply | Accepts 2.7–5.5 V; must be tied closely to VIN1 to minimize noise coupling into LDO path |
| 3 (VOUT2) | LDO regulated output | Delivers fixed 2.5 V @ 300 mA; requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 (PG) | Power-good status output | Push-pull signal asserted when VOUT2 reaches 94% of nominal - directly drives processor RESET |
| 5 (AGND) | Analog ground reference | Must connect to clean analog ground plane; separate from PGND to avoid switching noise injection |
| 6 (PGND) | Power ground return | High-current return path for buck switch node (LX); tie to AGND only at single point near IC |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor and catch diode/capacitor; carries high di/dt switching current |
| 8 (VIN1) | Buck input supply | Accepts 2.7–5.5 V; shared with VIN2 via short trace - primary source for both regulators |
| 9 (SHDN1) | Buck shutdown control input | Active-high logic (>45% VIN); enables/disables only VOUT1 - enables independent buck control |
| 10 (VFB1/VOUT1) | Buck feedback or output | For fixed-output variants like TC1303B-SP0EMF: connects directly to VOUT1 (1.8 V); no divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | Separate SHDN1 (buck) and SHDN2 (LDO) pins enable flexible power sequencing without external logic |
| LDO-monitored power-good | PG asserts only after VOUT2 stabilizes - ensures auxiliary rail is ready before system wake-up |
| Ultra-low quiescent current | 65 µA typical total IQ extends battery life in standby mode without sacrificing startup speed |
| Internal compensation | No external compensation components required for either regulator - reduces BOM count and layout complexity |
| Thermal and fault protection | Integrated UVLO, overtemperature shutdown (165°C), and output short-circuit protection prevent field failures |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Handheld blood glucose meter with Bluetooth LE wireless upload and LCD display. IC Role / Device Role / Timing Role: Dual-rail power source: 1.8 V for MCU core and 2.5 V for analog front-end and RF transceiver. Use Value: LDO-monitored PG ensures analog sensor circuitry is fully powered and stable before MCU initiates measurement sequence - eliminating ADC offset errors from rail instability. | Use Scenario: Field-deployable oscilloscope probe with USB-C host power and isolated signal conditioning. IC Role / Device Role / Timing Role: Primary power manager converting 5 V USB input to 1.8 V digital domain and 2.5 V precision reference rail. Use Value: 2.0 MHz switching frequency enables use of tiny 4.7 µH inductor and compact 3×3 mm DFN footprint - meeting strict size constraints of pocket-sized instrumentation. |
| Industrial Handheld Terminals | Wearable Health Monitors |
Use Scenario: Rugged barcode scanner operating from Li-ion battery with cold-temperature storage (–30°C). IC Role / Device Role / Timing Role: Dual-output PMIC supplying 1.8 V to ARM Cortex-M4 and 2.5 V to image sensor interface. Use Value: –40°C to +125°C operating range and 137 mV LDO dropout ensure reliable 2.5 V rail delivery even at end-of-discharge battery voltage (2.7 V) and sub-zero temperatures. | Use Scenario: Continuous ECG patch with 7-day battery life and motion-artifact rejection algorithm. IC Role / Device Role / Timing Role: Low-noise dual-rail source: 1.8 V for digital processing and 2.5 V for ultra-low-noise op-amps and ADC reference. Use Value: 1.8 µV/√Hz LDO output noise and 62 dB PSRR below 100 Hz preserve microvolt-level ECG signal integrity - critical for clinical-grade diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303C-SP0EMF | Monitors both VOUT1 and VOUT2 for PG assertion; same pinout and package | Required where system reset must wait for both rails - e.g., FPGA-based platforms with strict power sequencing | Select when dual-rail PG dependency is mandatory; otherwise TC1303B-SP0EMF simplifies timing validation |
| TPS65023BRSBR | Triple-output (2 buck + 1 LDO), I²C programmable, 2.25 MHz switching, QFN-32 | Supports dynamic voltage scaling and higher integration - suited for complex SoC power trees | Choose for multi-rail SoC designs needing configurability; TC1303B-SP0EMF offers lower cost and smaller footprint for fixed dual-rail needs |
Compared with TC1303C-SP0EMF and TPS65023BRSBR, TC1303B-SP0EMF provides optimized simplicity for LDO-critical applications - delivering guaranteed 2.5 V rail stability before system wake-up while minimizing component count and PCB area through fixed outputs and internal compensation.
Availability
TC1303B-SP0EMF is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, industrial handheld terminals, and wearable health monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC1303B-SP0EMF 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The TC1303 family is designed specifically for space- and power-constrained portable electronics, integrating buck and LDO regulation with intelligent power-good monitoring to reduce external component count and simplify power architecture design.
FAQ
What is the power-good behavior of TC1303B-SP0EMF?
The TC1303B-SP0EMF features a push-pull power-good (PG) output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches 94% of its nominal value (e.g., 2.35 V for 2.5 V output) and includes a 300 ms delay to allow full stabilization. This behavior is fixed per the TC1303B variant and differs from TC1303A (buck-monitored) and TC1303C (dual-monitored). The PG signal on TC1303B-SP0EMF is not open-drain.
Can TC1303B-SP0EMF generate custom output voltages?
TC1303B-SP0EMF is a factory-configured fixed-output variant: VOUT1 = 1.8 V and VOUT2 = 2.5 V. It does not support adjustable outputs - the VFB1/VOUT1 pin is internally connected to the 1.8 V output, and no external resistor divider is used. For adjustable versions, Microchip offers TC1303B-XXXXXX part numbers with "ADJ" suffix and different ordering codes; TC1303B-SP0EMF is not one of them.
What package type and thermal performance does TC1303B-SP0EMF use?
TC1303B-SP0EMF is supplied in a 10-lead 3×3 mm DFN package with exposed thermal pad. Its thermal resistance θJA is 41°C/W on a typical 4-layer PCB with internal ground plane and two vias under the pad. This enables continuous 500 mA buck output at +85°C ambient without derating, provided proper PCB copper area and via count are implemented per Microchip's layout guidelines.
How does TC1303B-SP0EMF handle light-load efficiency?
TC1303B-SP0EMF automatically transitions from fixed-frequency PWM mode (2.0 MHz) to pulse-frequency modulation (PFM) mode under light loads on the buck output. This reduces switching losses and maintains high efficiency down to ~1 mA load. The LDO remains active during PFM operation. Total device quiescent current stays at 65 µA typical, ensuring minimal battery drain in standby - a key advantage over forced-PWM-only regulators.
Is external compensation required for TC1303B-SP0EMF?
No. TC1303B-SP0EMF integrates full compensation networks for both the buck regulator and the LDO, eliminating the need for external capacitors or resistors in the feedback loop. This reduces bill-of-materials cost, saves PCB area, and removes tuning variables during design-in - all while maintaining stability across the full operating range (–40°C to +125°C, 2.7–5.5 V input, 0–500 mA load).
TC1303B-SP0EMF 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:
- 1.8V, 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)
TC1303B-SP0EMF FAQ
1.How can I place an order for TC1303B-SP0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-SP0EMF 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 TC1303B-SP0EMF reliable?
The price and inventory of TC1303B-SP0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-SP0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-SP0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-SP0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-SP0EMF?
TC1303B-SP0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-SP0EMF 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 TC1303B-SP0EMF?
For technical support, including TC1303B-SP0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-SP0EMF requirements.
6.How does Aetrix verify that TC1303B-SP0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-SP0EMF 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 TC1303B-SP0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-SP0EMF?
All TC1303B-SP0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-SP0EMF, 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 TC1303B-SP0EMF part is unused and in its original packaging.
Return procedure for TC1303B-SP0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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