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Microchip Technology TC1303B-PI0EUNTR
- Part No.:
- TC1303B-PI0EUNTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-PI0EUNTR.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,812
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Product details
Overview
TC1303B-PI0EUNTR 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 on the LDO output (VOUT2). It delivers 1.8 V @ 500 mA and 2.5 V @ 300 mA in typical fixed-output configuration, operates from 2.7–5.5 V input, and features 65 µA total quiescent current and -40°C to +125°C junction temperature range - ideal for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-PI0EUNTR datasheet, TC1303B-PI0EUNTR pinout, TC1303B-PI0EUNTR application, or TC1303B-PI0EUNTR equivalent, key selection considerations include its LDO-monitored PG output, independent SHDN2 control, 137 mV dropout at 200 mA, 2.0 MHz fixed-frequency PWM/PFM transition, and DFN/MSOP package compatibility with space-constrained battery-powered designs.
Technical Context
The TC1303B-PI0EUNTR 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 PWM-to-PFM mode transition 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 is dedicated to VOUT2 regulation with 94% threshold high, 89% threshold low, 2% hysteresis, and 300 ms active timeout - configured as push-pull output per DS21949C-page 9. 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 |
|---|---|
| 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 max - sufficient for modern ARM Cortex-M cores or FPGA I/O banks requiring 1.8 V |
| LDO Output Current | 300 mA max - powers analog sensors, RF front-ends, or interface circuitry with low noise |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on wearable sensors |
| LDO Dropout Voltage | 137 mV @ 200 mA - allows operation down to 2.837 V input when regulating 2.7 V output |
| Power-Good Output | Push-pull, monitors VOUT2 only - provides clean reset signal for microcontrollers tied to LDO rail |
| Operating Temperature | -40°C to +125°C junction - qualified for industrial and automotive under-hood auxiliary supplies |
Pinout & Package
TC1303B-PI0EUNTR is available in a 10-pin 3×3 mm DFN package with exposed pad (EP), pin-compatible with MSOP-10. The exposed pad must be soldered to AGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control | Active-high logic input (>45% VIN); enables/disables only the LDO output independently of buck stage |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1 (buck input); requires short trace routing to minimize noise coupling |
| 3 (VOUT2) | LDO regulated output | Delivers fixed or adjustable low-noise bias; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-good indicator | Push-pull output asserting high when VOUT2 is within 94–96% of target - used for processor reset sequencing |
| 5 (AGND) | Analog ground reference | Must connect to quiet analog ground plane; separate from PGND to avoid switching noise injection |
| 6 (PGND) | Power ground return | High-current return path for buck switch node; ties to AGND only at single point near EP |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor; carries high di/dt - requires tight loop layout with low-inductance paths |
| 8 (VIN1) | Buck input supply | Primary input for synchronous buck; shares source with VIN2 but routed separately for optimal decoupling |
| 9 (SHDN1) | Buck shutdown control | Active-high logic input (>45% VIN); independently disables buck regulator while LDO remains active |
| 10 (VFB1/VOUT1) | Buck feedback or output | Configured as VOUT1 for fixed-output variants; for adjustable versions, connects to resistor divider midpoint |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staggered power-up/down of buck and LDO rails - critical for FPGA or multi-core SoC sequencing |
| Internally compensated stages | Eliminates need for external compensation components on either regulator - reduces BOM count and layout area |
| Low-noise LDO output | 1.8 µV/√Hz output noise and 62 dB PSRR below 100 Hz - suitable for ADC references and RF biasing |
| Efficiency-optimized switching | Over 90% efficiency at 500 mA load with 2.0 MHz operation - enables use of small 4.7 µH inductors and 4.7 µF output caps |
| Robust protection suite | Integrated UVLO, overtemperature shutdown (165°C), and short-circuit current limiting on both outputs - prevents field failures in unattended systems |
Applications
| Portable Medical Sensors | USB-C Powered Peripherals |
|---|---|
Use Scenario: Continuous glucose monitor with Bluetooth LE radio and analog front-end. IC Role / Device Role / Timing Role: Dual-rail power manager supplying 1.8 V to BLE SoC and 2.5 V to precision ADC/reference. Use Value: 65 µA quiescent current extends coin-cell battery life; LDO-monitored PG ensures reliable sensor initialization before data acquisition. | Use Scenario: USB-powered HDMI adapter with integrated level-shifting and ESD protection. IC Role / Device Role / Timing Role: Generates 3.3 V for USB PHY and 1.2 V for HDMI controller core from 5 V USB bus. Use Value: Independent SHDN2 enables dynamic LDO disable during USB suspend, cutting system standby current by >95%. |
| Handheld Diagnostic Tools | Industrial Handheld Terminals |
Use Scenario: Battery-operated ultrasound probe with pulsed transmit/receive circuitry. IC Role / Device Role / Timing Role: Powers 1.5 V FPGA fabric and 3.3 V analog beamformer from single Li-ion cell. Use Value: 137 mV LDO dropout enables full 3.3 V output until battery reaches 3.437 V - maximizing usable capacity. | Use Scenario: Ruggedized barcode scanner operating in warehouse environments (-20°C to +70°C). IC Role / Device Role / Timing Role: Supplies 2.5 V to image sensor and 1.8 V to ARM Cortex-A53 application processor. Use Value: -40°C to +125°C rating guarantees startup and regulation across extreme ambient conditions without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16321-330I/MS | Single-output 600 mA buck only; no integrated LDO or PG monitoring | Requires external LDO and reset supervisor for dual-rail systems | Select when only one regulated rail is needed and board space permits discrete support components |
| TPS65023BRSBR | Triple-output (2 buck + 1 LDO); 2.0 MHz switching; PG monitors buck1 only | Higher integration but larger 4×4 mm QFN package and higher IQ (120 µA) | Choose when three rails are required and thermal performance allows higher θJA (45°C/W) |
Compared with MCP16321-330I/MS and TPS65023BRSBR, TC1303B-PI0EUNTR uniquely combines LDO-monitored push-pull PG, independent shutdown, and 3×3 mm footprint - delivering lowest component count for compact dual-rail battery systems where LDO rail reliability is mission-critical.
Availability
TC1303B-PI0EUNTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered peripherals, and handheld diagnostic tools requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC1303B-PI0EUNTR 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.
The TC1303 family was designed to reduce bill-of-materials and PCB area in space-constrained, battery-powered systems requiring tightly regulated dual-voltage rails with intelligent power sequencing and supervision.
FAQ
What output voltages does the TC1303B-PI0EUNTR support?
The TC1303B-PI0EUNTR supports fixed-output configurations including 1.8 V for the buck regulator (VOUT1) and 2.5 V for the LDO (VOUT2), as confirmed in the typical application circuit on DS21949C-page 5. It also supports adjustable buck output from 0.8 V to 4.5 V via external resistor divider on the VFB1 pin. The LDO offers standard fixed options of 1.5 V, 1.8 V, 2.5 V, and 3.3 V - with TC1303B-PI0EUNTR specifically configured for 2.5 V.
How does the power-good (PG) function operate in TC1303B-PI0EUNTR?
The TC1303B-PI0EUNTR implements a push-pull PG output that monitors only the LDO output (VOUT2), per DS21949C-page 3 note 2 and page 9 electrical specs. It asserts high when VOUT2 reaches ≥94% of its nominal value, with 2% hysteresis and a 300 ms active timeout period. This differs from TC1303A (monitors buck) and TC1303C/TC1304 (monitor both), making TC1303B-PI0EUNTR ideal for systems where LDO rail integrity is the primary reset condition.
Can TC1303B-PI0EUNTR operate with separate input sources for VIN1 and VIN2?
No - the TC1303B-PI0EUNTR requires VIN1 and VIN2 to be supplied from the same input source, as explicitly stated in DS21949C-page 7 Note 8 and page 3 functional block diagram. Routing separate supplies violates the internal design assumptions for UVLO, sequencing, and ground referencing, and may cause erratic behavior or failure to regulate. Board layout must tie VIN1 and VIN2 together with minimal trace length.
What is the thermal performance of TC1303B-PI0EUNTR in the DFN package?
In the 10-lead 3×3 mm DFN package with exposed pad soldered to AGND, TC1303B-PI0EUNTR has 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 EP, per DS21949C-page 10. At full 500 mA buck + 300 mA LDO load with 5 V input, power dissipation is ~450 mW - resulting in ~18.5°C junction rise above ambient, well within the -40°C to +125°C operating range.
Does TC1303B-PI0EUNTR support automatic power sequencing between its outputs?
No - automatic sequencing is exclusive to the TC1304 variant, as shown in the functional block diagram on DS21949C-page 4 and feature list on page 1. TC1303B-PI0EUNTR provides independent shutdown pins (SHDN1 for buck, SHDN2 for LDO), enabling externally controlled sequencing via MCU GPIOs or discrete logic, but lacks internal timing circuitry for autonomous ramp-up/ramp-down order. This gives designers full flexibility but requires external control implementation.
TC1303B-PI0EUNTR 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:
- 1.8V, 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-MSOP
TC1303B-PI0EUNTR FAQ
1.How can I place an order for TC1303B-PI0EUNTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-PI0EUNTR 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-PI0EUNTR reliable?
The price and inventory of TC1303B-PI0EUNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-PI0EUNTR is usually 5 days.
3.What payment methods are accepted for TC1303B-PI0EUNTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-PI0EUNTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-PI0EUNTR?
TC1303B-PI0EUNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-PI0EUNTR 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-PI0EUNTR?
For technical support, including TC1303B-PI0EUNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-PI0EUNTR requirements.
6.How does Aetrix verify that TC1303B-PI0EUNTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-PI0EUNTR 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-PI0EUNTR meets industry standards.
7.What is the process for return or replacement of TC1303B-PI0EUNTR?
All TC1303B-PI0EUNTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-PI0EUNTR, 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-PI0EUNTR part is unused and in its original packaging.
Return procedure for TC1303B-PI0EUNTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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