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Microchip Technology TC1303B-VA0EMF
- Part No.:
- TC1303B-VA0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-VA0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,949
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Product details
Overview
TC1303B-VA0EMF 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 specifically of the LDO output. It delivers 1.8V/500 mA on VOUT1 and 3.3V/300 mA on VOUT2, operates from 2.7–5.5V input, and features 65 µA typical quiescent current and 300 ms PG delay for processor reset sequencing in portable electronics.
For engineers reviewing the TC1303B-VA0EMF datasheet, TC1303B-VA0EMF pinout, TC1303B-VA0EMF application, or TC1303B-VA0EMF equivalent, key selection criteria include its LDO-monitored power-good behavior, independent shutdown control per rail, 2.0 MHz fixed-frequency PWM operation with automatic PFM transition, 137 mV typical dropout at 200 mA, and compatibility with 1 µF ceramic output capacitors on both outputs.
Technical Context
The TC1303B-VA0EMF implements a synchronous buck topology with integrated P-channel and N-channel MOSFETs (RDS(on) = 450 mΩ each), fixed 2.0 MHz switching frequency under heavy load, and seamless auto-transition to pulse-frequency modulation (PFM) at light loads to maintain ultra-low IQ. Its LDO stage uses internal compensation and achieves ±0.3% output voltage tolerance over temperature.
Power-good logic is dedicated to VOUT2 regulation (94% threshold, 2% hysteresis, 30 ppm/°C tempco), with push-pull PG output - a distinguishing feature versus open-drain variants (TC1303A/C, TC1304). UVLO triggers at 2.55 V nominal with 200 mV hysteresis, and thermal shutdown activates at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 1.8V @ 500 mA; adjustable range 0.8–4.5V; 280 mV dropout at full load |
| Output 2 (LDO) | 3.3V @ 300 mA; 137 mV typical dropout @ 200 mA; ±0.3% tolerance |
| Quiescent Current | 65 µA typical total device IQ; enables >100-hour battery life in always-on portable devices |
| Switching Frequency | 2.0 MHz fixed (PWM mode); auto-shifts to PFM at light load to preserve efficiency |
| Power-Good Output | Push-pull PG tied to VOUT2; 300 ms delay; active-high when VOUT2 ≥ 94% of nominal |
| Operating Temp | -40°C to +125°C junction; validated for industrial and extended-temperature embedded use |
| Input Voltage Range | 2.7V to 5.5V; supports single-cell Li-ion (3.0–4.2V) and USB 5V supply rails |
Pinout & Package
TC1303B-VA0EMF is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), rated θJA = 41°C/W on 4-layer board. Pin functions are electrically and thermally optimized for compact DC/DC layout with minimal external components.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control | Active-high enable; >45% VIN turns on LDO; <15% VIN forces shutdown |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1; must be short-traced to minimize noise coupling |
| 3 (VOUT2) | LDO regulated output | 3.3V fixed; requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 (PG) | Power-good indicator | Push-pull output; drives high when VOUT2 is within 94–96% of 3.3V |
| 5 (AGND) | Analog ground reference | Must connect to clean analog ground plane; separate from PGND return path |
| 6 (PGND) | Power ground return | High-current return for buck switch node; ties to LX and VIN1 ground paths |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor; carries high di/dt; requires tight loop area |
| 8 (VIN1) | Buck input supply | 2.7–5.5V input; shared with VIN2; requires local 4.7 µF input capacitor |
| 9 (SHDN1) | Buck shutdown control | Independent active-high enable; allows staggered startup/shutdown of rails |
| 10 (VFB1/VOUT1) | Buck feedback/sense | Fixed 1.8V output; pin tied directly to VOUT1; no external divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown per rail | SHDN1 and SHDN2 allow precise sequencing-e.g., hold LDO active while buck ramps down during sleep entry |
| Internally compensated LDO | Eliminates need for external compensation network; reduces BOM count and layout sensitivity |
| Low-noise buck architecture | 2.0 MHz fixed frequency minimizes EMI filter size; PFM mode preserves efficiency below ~10 mA load |
| Thermal & fault protection | Integrated overtemperature (165°C), UVLO (2.55 V), and short-circuit protection on both outputs |
| Small-footprint packaging | 3×3 mm DFN with EP enables <12 mm² total solution area including inductor and caps |
Applications
| Cellular Handsets | USB-Powered Peripherals |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.8V core) and RF transceiver bias (3.3V). IC Role / Device Role / Timing Role: Primary PMIC delivering tightly regulated, sequenced supplies with PG-driven reset assertion. Use Value: 65 µA IQ extends standby time; 300 ms PG delay ensures reliable processor initialization after LDO stabilization. | Use Scenario: Compact bus-powered hub or dongle requiring clean 1.8V logic and 3.3V I/O from 5V USB source. IC Role / Device Role / Timing Role: Single-chip dual-output regulator replacing discrete buck+LDO solutions. Use Value: 1 µF LDO output cap and integrated compensation reduce component count by ≥4 vs. discrete design. |
| Portable Medical Sensors | Handheld PDAs |
Use Scenario: Battery-operated glucose meter or pulse oximeter needing stable analog front-end (3.3V) and low-power MCU core (1.8V). IC Role / Device Role / Timing Role: Power supervisor with LDO-monitored PG ensuring sensor ADC calibration completes before data acquisition. Use Value: 137 mV LDO dropout maximizes usable battery range; -40°C to +125°C rating supports clinical environment operation. | Use Scenario: Legacy PDA with ARM9 CPU (1.8V core) and SD card interface (3.3V I/O) powered from Li-ion pack. IC Role / Device Role / Timing Role: Dual-output PMIC enabling independent rail control during suspend/resume transitions. Use Value: Independent SHDN1/SHDN2 pins allow software-controlled power gating of peripherals without affecting core logic supply. |
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 600 mA buck only; no integrated LDO; requires external LDO for second rail | Lacks monolithic dual-rail integration; increases board area and component count | Choose when higher buck current (600 mA) is required and LDO can be added externally |
| TPS65023RSBR | Triple-output PMIC (2 buck + 1 LDO); 2.25 MHz switching; I2C programmable; larger 4×4 QFN | Offers greater flexibility but higher cost, complexity, and footprint than TC1303B-VA0EMF | Choose when system requires three independent rails or digital configuration capability |
Compared with MCP16311-H/MS and TPS65023RSBR, TC1303B-VA0EMF provides optimal balance of integration, low IQ, and minimal footprint for fixed dual-rail systems-eliminating external LDOs while maintaining sub-100 µA quiescent draw and 3×3 mm DFN packaging.
Availability
TC1303B-VA0EMF is available at Aetrix Electronics and suitable for cellular handsets, USB-powered peripherals, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303B-VA0EMF 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, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The TC1303 family was designed specifically for space-constrained, battery-powered portable electronics requiring highly integrated, low-quiescent-current dual-rail power solutions with robust protection and simple layout.
FAQ
What output voltages does the TC1303B-VA0EMF provide?
The TC1303B-VA0EMF provides a fixed 1.8V output (VOUT1) from its synchronous buck regulator and a fixed 3.3V output (VOUT2) from its low-dropout linear regulator. These values are factory-set for this specific variant (VA0EMF), eliminating the need for external feedback resistors. Both outputs are internally compensated and specified across the full -40°C to +125°C operating junction temperature range.
How does the power-good (PG) function operate in TC1303B-VA0EMF?
In TC1303B-VA0EMF, the power-good output monitors only the LDO output (VOUT2). It asserts high (push-pull) when VOUT2 reaches and remains within 94% to 96% of its nominal 3.3V value, with a built-in 300 ms delay to prevent false triggering during transient conditions. This behavior distinguishes TC1303B-VA0EMF from TC1303A (monitors buck) and TC1303C/TC1304 (monitors both rails).
Can TC1303B-VA0EMF operate from a single-cell Li-ion battery?
Yes, TC1303B-VA0EMF supports input voltages from 2.7V to 5.5V, making it fully compatible with single-cell Li-ion batteries (nominal 3.7V, discharge range ~3.0–4.2V). Its 137 mV typical dropout on the 3.3V LDO ensures usable output down to ~3.44V input, and the buck regulator maintains regulation even as battery voltage drops to 2.7V - critical for maximizing runtime in portable designs.
What is the minimum output capacitance required for TC1303B-VA0EMF's LDO output?
The TC1303B-VA0EMF LDO output (VOUT2) requires a minimum of 1 µF ceramic capacitor connected between VOUT2 and AGND for stable operation. This low requirement - enabled by internal compensation - reduces bill-of-materials cost and PCB area compared to many competing LDOs that demand ≥10 µF tantalum or aluminum electrolytic capacitors. X5R or X7R dielectrics are recommended for temperature stability.
Does TC1303B-VA0EMF support independent enable control for each output?
Yes, TC1303B-VA0EMF provides two independent shutdown inputs: SHDN1 controls the buck regulator (VOUT1), and SHDN2 controls the LDO (VOUT2). Each pin is active-high, requiring >45% of VIN to enable its respective output. This allows flexible power sequencing - for example, enabling the LDO first to power auxiliary circuitry before bringing up the processor core rail - without requiring external logic or timing components.
TC1303B-VA0EMF 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:
- 1.2V, 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)
TC1303B-VA0EMF FAQ
1.How can I place an order for TC1303B-VA0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-VA0EMF 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-VA0EMF reliable?
The price and inventory of TC1303B-VA0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-VA0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-VA0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-VA0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-VA0EMF?
TC1303B-VA0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-VA0EMF 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-VA0EMF?
For technical support, including TC1303B-VA0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-VA0EMF requirements.
6.How does Aetrix verify that TC1303B-VA0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-VA0EMF 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-VA0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-VA0EMF?
All TC1303B-VA0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-VA0EMF, 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-VA0EMF part is unused and in its original packaging.
Return procedure for TC1303B-VA0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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