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Microchip Technology TC1303B-PA0EUN
- Part No.:
- TC1303B-PA0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-PA0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
TC1303B-PA0EUN 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 1.5V at 500 mA and 2.5V at 300 mA in fixed-output configuration, features 2.0 MHz PWM switching, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature. It targets space-constrained portable systems requiring tightly regulated dual-rail supplies.
For engineers reviewing the TC1303B-PA0EUN datasheet, TC1303B-PA0EUN pinout, TC1303B-PA0EUN application, or TC1303B-PA0EUN equivalent, key selection criteria include LDO-monitored PG behavior, independent SHDN2 control for the LDO, 137 mV dropout at 200 mA, DFN/MSOP package compatibility, and thermal shutdown at 165°C - all critical for battery-powered medical instruments and USB-powered devices.
Technical Context
The TC1303B-PA0EUN implements a fixed-frequency 2.0 MHz synchronous buck stage with automatic PWM-to-PFM transition under light load, minimizing idle current while maintaining low output noise. Its LDO stage uses internal compensation and requires only a single 1 µF ceramic output capacitor.
Power-good logic is dedicated solely to VOUT2 regulation (94% threshold, 300 ms delay), with a push-pull PG output - distinct from TC1303A (open-drain, monitors VOUT1) and TC1303C/TC1304 (dual-monitoring). Shutdown is independently controlled via SHDN1 (buck) and SHDN2 (LDO), enabling flexible power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 500 mA max, adjustable 0.8–4.5 V or fixed 0.8/1.2/1.5/1.8/2.5/3.3 V; enables core voltage rails |
| Output 2 (LDO) | 300 mA max, fixed 1.5/1.8/2.5/3.3 V; provides clean bias supply with 137 mV dropout @ 200 mA |
| Power-Good Output | Push-pull, monitors only VOUT2 with 94% threshold and 300 ms delay; directly drives processor reset |
| Quiescent Current | 65 µA typical total device IQ; supports ultra-low-power standby in portable applications |
| Switching Frequency | 2.0 MHz fixed (typ), ±0.4 MHz tolerance; allows use of small 4.7 µH inductor and compact layout |
| Operating Temperature | –40°C to +125°C junction range; qualified for industrial and extended-temperature embedded designs |
| Protection Features | UVLO (2.55 V nominal), overtemperature shutdown (165°C), short-circuit current limiting on both outputs |
Pinout & Package
TC1303B-PA0EUN is available in a 10-pin 3×3 mm DFN package with exposed pad (EP), pin-compatible with the MSOP variant. The exposed pad must be connected to AGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown input | Active-high logic input (>45% VIN); enables/disables LDO independently of buck stage |
| 2 (VIN2) | LDO input supply | Accepts 2.7–5.5 V input; must be tied closely to VIN1 to minimize noise coupling |
| 3 (VOUT2) | LDO regulated output | Delivers fixed 1.5V/1.8V/2.5V/3.3V; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-good indicator | Push-pull output asserting high when VOUT2 ≥94% of nominal; used for system reset coordination |
| 5 (AGND) | Analog ground reference | Separate ground return for feedback and sensing; must connect to quiet analog ground plane |
| 6 (PGND) | Power ground | 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 inductor; carries high di/dt; requires tight loop area with PGND |
| 8 (VIN1) | Buck input supply | Accepts 2.7–5.5 V; shared input source with VIN2 per design note |
| 9 (SHDN1) | Buck shutdown input | Active-high logic input (>45% VIN); controls buck stage independently of LDO |
| 10 (VFB1/VOUT1) | Buck feedback or output | Fixed-output config: connect directly to VOUT1; adjustable config: connect divider midpoint |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shutdown control | SHDN1 and SHDN2 allow staggered enable/disable of buck and LDO for precise power sequencing |
| Internally compensated LDO | Eliminates need for external compensation components; reduces BOM count and board area |
| Low-noise 2.0 MHz buck switching | Enables use of miniature 4.7 µH inductors and avoids audible noise in sensitive audio/medical systems |
| Push-pull PG output (TC1303B only) | Drives reset lines directly without pull-up resistor; simplifies interface to microcontrollers with open-drain inputs |
| Thermal and UVLO protection | Automatically disables outputs during overtemperature (165°C) or input undervoltage (<2.4 V) |
Applications
| Handheld Medical Instruments | USB-Powered Devices |
|---|---|
Use Scenario: Portable glucose meters and pulse oximeters requiring stable dual-rail power from single-cell Li-ion or USB 5 V input. IC Role / Device Role / Timing Role: Provides isolated 1.8 V for MCU core and 3.3 V for sensor interface/ADC, with PG-driven reset assurance. Use Value: 137 mV LDO dropout ensures full 3.3 V output down to 3.437 V input, maximizing battery runtime. | Use Scenario: USB bus-powered test adapters and firmware programmers needing clean, sequenced 1.5 V and 2.5 V rails. IC Role / Device Role / Timing Role: Generates regulated outputs from 4.75–5.25 V USB supply; PG asserts after 300 ms to synchronize host enumeration. Use Value: 65 µA quiescent current minimizes standby drain when device is suspended but powered via USB. |
| Portable Computers | Cellular Phones |
Use Scenario: Subnotebook subsystems (e.g., camera module, display backlight controller) with tight space constraints. IC Role / Device Role / Timing Role: Delivers 1.2 V for image signal processor and 2.5 V for interface logic; DFN package saves PCB area vs discrete solutions. Use Value: 2.0 MHz switching permits <1 mm² inductor footprint, critical for ultra-thin form factors. | Use Scenario: Feature phone baseband and RF front-end power domains operating from single Li-ion cell (2.7–4.2 V). IC Role / Device Role / Timing Role: Supplies 1.5 V to baseband ASIC and 2.5 V to RF transceiver; independent SHDN2 enables quick LDO disable during sleep mode. Use Value: 300 mA LDO output sustains peak transmit current without droop, ensuring RF stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16321-500/300 | Same buck+LDO architecture, but PG monitors buck output only; no SHDN2 pin - LDO always enabled when buck is active | Suitable where LDO must remain on during buck sleep; not viable for independent LDO control | Select if system requires simpler control with no need for LDO-only shutdown |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO), I2C programmable, higher IQ (120 µA), larger 4×4 QFN package | Used in OMAP-based handhelds requiring dynamic voltage scaling; adds complexity and cost | Select only if additional rail or digital configurability justifies size and cost premium |
Compared with MCP16321-500/300 and TPS65023RGZR, TC1303B-PA0EUN uniquely offers LDO-monitored PG and independent SHDN2 - essential for systems where LDO-supplied peripherals must assert reset before buck-powered logic initializes.
Availability
TC1303B-PA0EUN is available at Aetrix Electronics and suitable for handheld medical instruments, USB-powered devices, and portable computers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TC1303B-PA0EUN 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 specifically for space-constrained portable electronics needing highly integrated, low-quiescent-current dual-rail power solutions with configurable monitoring and sequencing.
FAQ
What is the power-good (PG) behavior of TC1303B-PA0EUN?
The TC1303B-PA0EUN features a push-pull PG output that monitors only the LDO output (VOUT2), asserting high when VOUT2 reaches ≥94% of its nominal value. It includes a fixed 300 ms delay after regulation is achieved, making it ideal for coordinating processor reset timing in systems where the LDO powers critical logic. This differs from TC1303A (monitors buck) and TC1303C (monitors both).
Does TC1303B-PA0EUN support adjustable output voltage on the buck regulator?
Yes, TC1303B-PA0EUN supports adjustable buck output from 0.8 V to 4.5 V using an external resistor divider connected to the VFB1/VOUT1 pin. The internal reference is 0.8 V ±2.5%, and the part also offers factory-trimmed fixed outputs (0.8/1.2/1.5/1.8/2.5/3.3 V). The LDO output remains fixed per variant - for TC1303B-PA0EUN, it is 1.5 V and 2.5 V.
What package options are available for TC1303B-PA0EUN?
TC1303B-PA0EUN is offered in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), and is pin-compatible with the 10-pin MSOP variant. The DFN version provides superior thermal performance (θJA = 41°C/W on 4-layer board) and smaller footprint, while the MSOP eases hand-soldering and prototyping. Both require AGND connection to the exposed pad.
How does TC1303B-PA0EUN manage efficiency across load conditions?
TC1303B-PA0EUN uses automatic PWM-to-PFM mode transition in the buck stage: at heavy loads (>100 mA), it operates in fixed 2.0 MHz PWM for high efficiency (>90% typical); at light loads, it shifts to PFM to reduce switching losses and maintain 65 µA total IQ. The LDO contributes ~46 µA IQ when active, and both regulators feature internal compensation to avoid external components.
Can TC1303B-PA0EUN operate from a single Li-ion cell?
Yes, TC1303B-PA0EUN supports input voltages from 2.7 V to 5.5 V, fully covering the discharge range of a single Li-ion cell (2.7–4.2 V). Its 137 mV LDO dropout at 200 mA ensures stable 2.5 V output down to 2.637 V input, and the buck stage maintains regulation even at minimum VIN when configured for ≤2.5 V output - enabling robust operation across full battery life.
TC1303B-PA0EUN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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:
- 1.8V, 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-MSOP
TC1303B-PA0EUN FAQ
1.How can I place an order for TC1303B-PA0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-PA0EUN 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-PA0EUN reliable?
The price and inventory of TC1303B-PA0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-PA0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-PA0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-PA0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-PA0EUN?
TC1303B-PA0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-PA0EUN 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-PA0EUN?
For technical support, including TC1303B-PA0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-PA0EUN requirements.
6.How does Aetrix verify that TC1303B-PA0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-PA0EUN 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-PA0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-PA0EUN?
All TC1303B-PA0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-PA0EUN, 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-PA0EUN part is unused and in its original packaging.
Return procedure for TC1303B-PA0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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