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Microchip Technology TC1303B-VS0EUNTR
- Part No.:
- TC1303B-VS0EUNTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-VS0EUNTR.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,319
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Product details
Overview
TC1303B-VS0EUNTR 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 the power-good (PG) output monitoring only the LDO output (VOUT2). It delivers 1.8 V on VOUT1 and 3.3 V on VOUT2, operates from 2.7–5.5 V input, and features 65 µA typical quiescent current and -40°C to +125°C junction temperature range - optimized for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-VS0EUNTR datasheet, TC1303B-VS0EUNTR pinout, TC1303B-VS0EUNTR application, or TC1303B-VS0EUNTR equivalent, key selection criteria include its LDO-monitored PG function, independent shutdown control per rail, 2.0 MHz fixed-frequency PWM operation, 137 mV typical dropout at 200 mA on VOUT2, and compatibility with 1 µF ceramic output capacitance for minimal board area.
Technical Context
The TC1303B-VS0EUNTR implements a synchronous buck converter with automatic transition between PWM and PFM modes to maintain high efficiency (>90% typical) under heavy load while minimizing quiescent current during light load. Its internal compensation eliminates external loop components.
The integrated 300 mA LDO features a push-pull power-good output referenced solely to VOUT2, with 94% regulation threshold, 300 ms active timeout, and 1.2 V minimum PG output high level - enabling direct processor reset assertion without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 1.8 V fixed, 500 mA max - supplies core voltage for low-power processors or FPGAs |
| Output 2 (LDO) | 3.3 V fixed, 300 mA max - powers I/O, USB PHY, or analog circuitry requiring low noise |
| Power-Good Monitoring | LDO-only (VOUT2), push-pull PG output - enables immediate system reset upon LDO fault |
| Quiescent Current | 65 µA typical total - extends battery life in always-on portable applications |
| Dropout Voltage (VOUT2) | 137 mV typical @ 200 mA - supports operation down to VIN = 3.437 V for 3.3 V output |
| Switching Frequency | 2.0 MHz fixed (PWM mode) - allows use of compact 4.7 µH inductor and reduces EMI filtering burden |
| Operating Temp Range | -40°C to +125°C junction - qualified for industrial and extended-temperature embedded systems |
Pinout & Package
TC1303B-VS0EUNTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), rated for θJA = 41°C/W on a 4-layer board with internal ground plane and 2 vias under EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control input | Active-high logic input (>45% VIN); enables independent disable of VOUT2 without affecting buck regulator |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1 (2.7–5.5 V); must be routed with minimal trace length to VIN1 |
| 3 (VOUT2) | 3.3 V LDO regulated output | Requires ≥1 µF ceramic capacitor to AGND; delivers low-noise bias for sensitive analog/USB circuits |
| 4 (PG) | Power-good status output | Push-pull output asserting high when VOUT2 ≥ 94% of 3.3 V; drives processor RESET directly |
| 5 (AGND) | Analog ground reference | Must connect to clean analog ground plane; separate from PGND except at single point |
| 6 (PGND) | Power ground return | High-current return path for buck switch node; connects to LX and VIN1 return |
| 7 (LX) | Buck switch node | Connects to external inductor; requires low-inductance layout to minimize switching losses and EMI |
| 8 (VIN1) | Buck input supply | Main input for buck stage (2.7–5.5 V); ties to VIN2 on PCB for shared input source |
| 9 (SHDN1) | Buck shutdown control input | Active-high logic input (>45% VIN); enables independent disable of VOUT1 |
| 10 (VFB1/VOUT1) | Buck feedback/sense | Connected directly to 1.8 V output (fixed version); no external divider required |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown per regulator | Enables precise power sequencing: VOUT2 can be disabled while VOUT1 remains active for partial-system sleep |
| Internally compensated buck and LDO | Eliminates need for external compensation networks - reduces BOM count and layout complexity |
| Automatic PWM-to-PFM mode transition | Maintains >85% efficiency at 1 mA load without manual mode control or additional circuitry |
| Push-pull PG output (TC1303B-specific) | Drives RESET line directly without pull-up resistor - simplifies reset circuit and improves noise immunity |
| Thermal and overcurrent protection | Shuts down at 165°C junction temp with 10°C hysteresis; protects against sustained overload or poor heatsinking |
Applications
| Portable Medical Instrumentation | USB-Powered Peripheral |
|---|---|
Use Scenario: Battery-operated glucose meter with LCD display, sensor interface, and USB data upload capability. IC Role / Device Role / Timing Role: Dual-rail power manager providing 1.8 V for MCU core and 3.3 V for USB transceiver and display driver. Use Value: 65 µA quiescent current extends shelf-life battery runtime; LDO-monitored PG ensures safe shutdown before sensor calibration drifts. | Use Scenario: Compact USB audio adapter drawing power exclusively from host port. IC Role / Device Role / Timing Role: Primary voltage translator generating stable 1.8 V (for codec DSP) and 3.3 V (for USB PHY) from noisy 5 V bus. Use Value: 2.0 MHz switching frequency avoids audible noise; 1 µF LDO output cap meets USB 2.0 ripple requirements without added filtering. |
| Handheld Industrial Scanner | Low-Power IoT Sensor Node |
Use Scenario: Rugged barcode scanner powered by Li-ion battery with cold-temperature operation requirement. IC Role / Device Role / Timing Role: Dual-output PMIC delivering 1.8 V to imaging sensor ASIC and 3.3 V to BLE radio and flash memory. Use Value: -40°C to +125°C rating ensures reliable startup at sub-zero ambient; independent SHDN1/SHDN2 enables deep-sleep mode with only RTC powered. | Use Scenario: Wireless environmental sensor node using coin-cell battery and transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Power supervisor generating 1.8 V for ultra-low-power MCU and 3.3 V for RF front-end during transmit bursts. Use Value: Automatic PFM mode reduces idle current to <100 µA; PG output triggers wake-up interrupt upon LDO stabilization after cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303C-VS0EUNTR | Monitors both buck and LDO outputs for PG assertion; open-drain PG output | Required where system-level reset must wait for both rails to stabilize | Select when coordinated power sequencing across both outputs is mandatory |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO); 2.25 MHz switching; I²C programmable voltages | Supports dynamic voltage scaling and higher current (1 A buck) | Choose when design requires >500 mA buck current or software-configurable outputs |
Compared with TC1303C-VS0EUNTR and TPS65023RGZR, TC1303B-VS0EUNTR offers the lowest component count for fixed 1.8 V/3.3 V systems with LDO-first reset timing, while avoiding I²C overhead and triple-rail complexity - ideal for cost-sensitive, space-constrained portable designs.
Availability
TC1303B-VS0EUNTR is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered peripherals, and handheld industrial scanners requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for TC1303B-VS0EUNTR 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, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The TC1303 family was designed specifically for space-constrained, battery-powered applications needing tightly regulated dual-rail power with minimal external components and robust thermal performance across extended temperature ranges.
FAQ
What output voltages does the TC1303B-VS0EUNTR provide?
The TC1303B-VS0EUNTR provides two fixed output voltages: 1.8 V on the buck regulator (VOUT1) and 3.3 V on the LDO (VOUT2). These values are factory-set and do not require external feedback resistors. The part number suffix "VS0" explicitly denotes this 1.8 V / 3.3 V configuration, and the TC1303B-VS0EUNTR datasheet confirms these outputs are trimmed to ±0.3% tolerance over temperature and load.
How does the power-good (PG) output behave on the TC1303B-VS0EUNTR?
The TC1303B-VS0EUNTR features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of 3.3 V (i.e., ≥3.102 V) and remains active for 262 ms (typical) before timing out if regulation is lost. This behavior is specific to the TC1303B variant and differs from TC1303A/C/TC1304, which use open-drain PG. The TC1303B-VS0EUNTR's push-pull PG can directly drive a processor RESET pin without an external pull-up resistor.
Can the TC1303B-VS0EUNTR operate from a single 3.7 V Li-ion battery?
Yes, the TC1303B-VS0EUNTR supports input voltages from 2.7 V to 5.5 V, making it fully compatible with a single-cell Li-ion battery (nominal 3.7 V, discharge range ~3.0–4.2 V). At 3.0 V input, the 3.3 V LDO output remains functional only if load current is reduced to maintain VIN2 – VOUT2 ≥ 137 mV dropout (i.e., ≤200 mA). The buck regulator maintains 1.8 V output down to 2.7 V input due to its step-down architecture.
What is the recommended output capacitance for the TC1303B-VS0EUNTR's LDO?
The TC1303B-VS0EUNTR's LDO (VOUT2) requires a minimum of 1 µF ceramic capacitor connected between VOUT2 and AGND for stability and transient response. The datasheet specifies this value applies across all operating conditions and output voltages. Using a 1 µF X5R or X7R ceramic capacitor with low ESR ensures proper regulation, fast load-step recovery, and compliance with the 300 mA maximum output current specification. Larger values (e.g., 2.2 µF) are acceptable but not required.
Does the TC1303B-VS0EUNTR support independent enable control for each output?
Yes, the TC1303B-VS0EUNTR provides independent shutdown control via SHDN1 (buck) and SHDN2 (LDO). Both are active-high logic inputs with VIH ≥ 45% VIN and VIL ≤ 15% VIN. Driving SHDN2 low disables only VOUT2 while leaving VOUT1 operational, and vice versa for SHDN1. This capability enables flexible power sequencing - for example, powering down the 3.3 V I/O rail while keeping the 1.8 V core rail active for low-power retention modes in the TC1303B-VS0EUNTR.
TC1303B-VS0EUNTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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:
- 1.2V, 500mA
- Voltage/Current - Output 2:
- 1.5V, 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-MSOP
TC1303B-VS0EUNTR FAQ
1.How can I place an order for TC1303B-VS0EUNTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-VS0EUNTR 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-VS0EUNTR reliable?
The price and inventory of TC1303B-VS0EUNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-VS0EUNTR is usually 5 days.
3.What payment methods are accepted for TC1303B-VS0EUNTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-VS0EUNTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-VS0EUNTR?
TC1303B-VS0EUNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-VS0EUNTR 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-VS0EUNTR?
For technical support, including TC1303B-VS0EUNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-VS0EUNTR requirements.
6.How does Aetrix verify that TC1303B-VS0EUNTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-VS0EUNTR 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-VS0EUNTR meets industry standards.
7.What is the process for return or replacement of TC1303B-VS0EUNTR?
All TC1303B-VS0EUNTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-VS0EUNTR, 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-VS0EUNTR part is unused and in its original packaging.
Return procedure for TC1303B-VS0EUNTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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