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Microchip Technology TC1303B-AG0EUN
- Part No.:
- TC1303B-AG0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-AG0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,759
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Product details
Overview
TC1303B-AG0EUN 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 1.8 V (buck) and 3.3 V (LDO) fixed outputs, operates from 2.7–5.5 V input, and features 65 µA typical quiescent current and -40°C to +125°C junction temperature range. It targets portable battery-powered systems requiring tightly regulated dual-rail supplies.
For engineers reviewing the TC1303B-AG0EUN datasheet, TC1303B-AG0EUN pinout, TC1303B-AG0EUN application, or TC1303B-AG0EUN equivalent, key selection criteria include 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 rails.
Technical Context
The TC1303B-AG0EUN implements a synchronous buck converter with internal high- and low-side 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 quiescent current. Its LDO stage uses a separate input (VIN2) and provides rail-specific regulation with 0.3% output tolerance and 25 ppm/°C temperature coefficient.
Power-good logic is dedicated solely to the LDO output (VOUT2), generating a push-pull PG signal that asserts after a 300 ms delay when VOUT2 reaches ≥94% of nominal and deasserts when falling below 92%. UVLO (2.55 V typ), overtemperature shutdown (165°C), and short-circuit protection are integrated across both regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA max - supports core voltage for mid-performance processors or FPGAs |
| LDO Output Current | 300 mA max - powers I/O, memory, or analog peripherals with low noise |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on sensor nodes |
| LDO Dropout Voltage | 137 mV @ 200 mA - allows operation down to 2.837 V input for 3.3 V output |
| Switching Frequency | 2.0 MHz fixed (heavy load) - permits use of small 4.7 µH inductors and compact layout |
| Power-Good Monitoring | LDO-only (VOUT2) with 94%/92% thresholds and 300 ms delay - directly sequences processor reset |
| Operating Temp Range | -40°C to +125°C junction - qualified for automotive cabin and industrial edge environments |
Pinout & Package
TC1303B-AG0EUN is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for high-power-density portable designs. Pin 11 (EP) must be soldered to AGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO Shutdown Input | Active-high logic control (≥45% VIN); enables/disables only VOUT2 |
| 2 (VIN2) | LDO Input Supply | Dedicated input for LDO stage; must be tied closely to VIN1 |
| 3 (VOUT2) | LDO Regulated Output | 3.3 V fixed output; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-Good Output | Push-pull signal indicating VOUT2 is within regulation (94–92% window) |
| 5 (AGND) | Analog Ground Reference | Low-noise ground return for feedback and regulation circuitry |
| 6 (PGND) | Power Ground Return | High-current return path for buck switch node (LX) and LDO |
| 7 (LX) | Buck Switch Node | Connection to external inductor; carries pulsed high-current waveform |
| 8 (VIN1) | Buck Input Supply | Main input for buck stage; shared with VIN2 via short PCB trace |
| 9 (SHDN1) | Buck Shutdown Input | Active-high logic control (≥45% VIN); enables/disables only VOUT1 |
| 10 (VFB1/VOUT1) | Buck Feedback / Output | Fixed 1.8 V output pin; no external divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent rail shutdown | SHDN1 and SHDN2 allow staggered power-up/down of buck and LDO outputs without external sequencing logic |
| Internally compensated loops | Eliminates need for external compensation components - reduces BOM count and layout sensitivity |
| Ultra-low noise LDO | 1.8 µV/√Hz output noise and 62 dB PSRR at ≤100 Hz enable clean supply for ADCs and RF receivers |
| Automatic PWM-to-PFM mode transition | Maintains >85% efficiency down to 1 mA load without firmware or external control |
| Robust protection suite | Integrated UVLO, thermal shutdown (165°C), and short-circuit current limiting protect against common field failures |
Applications
| Cellular Handset Power Management | USB-Powered Medical Sensor Hub |
|---|---|
Use Scenario: Dual-rail supply for baseband processor (1.8 V core) and RF transceiver (3.3 V I/O). IC Role / Device Role / Timing Role: Primary power management IC providing sequenced, regulated voltages with processor reset signaling via PG. Use Value: 65 µA quiescent current extends standby time; LDO-monitored PG ensures reliable reset during brownout recovery. | Use Scenario: Compact wearable device powered from USB 5 V, requiring isolated 1.8 V and 3.3 V rails for sensor interface and BLE radio. IC Role / Device Role / Timing Role: Single-chip dual-output regulator with minimal external components and guaranteed startup timing. Use Value: 1 µF output capacitors reduce board area by >40% vs. legacy solutions; 2.0 MHz switching enables <2 mm² inductor footprint. |
| Industrial Portable Data Logger | Handheld Diagnostic Tool |
Use Scenario: Battery-operated logger using Li-ion (2.7–4.2 V) to power microcontroller (1.8 V) and SD card interface (3.3 V). IC Role / Device Role / Timing Role: High-efficiency dual regulator with wide input range and extended temperature operation. Use Value: 90%+ buck efficiency at 500 mA minimizes heat rise in sealed enclosure; -40°C to +125°C rating ensures reliability in uncontrolled environments. | Use Scenario: Field-deployable tool with LCD display, touch controller, and USB host - all requiring stable, low-noise supplies. IC Role / Device Role / Timing Role: Integrated power solution delivering clean, sequenced rails with built-in power-good assertion. Use Value: Push-pull PG output drives reset line directly without pull-up resistor; LDO's 25 ppm/°C drift maintains accuracy across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303A-AD0EUN | PG monitors buck output (VOUT1), not LDO; open-drain PG output requires external pull-up | Suitable where processor reset must track core voltage, not I/O rail | Select when system reset timing depends on CPU core supply stability |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO), 2.25 MHz switching, higher IQ (80 µA), QFN-24 package | Supports more complex SoC power trees; larger footprint and higher cost | Choose when additional voltage rails or higher integration justify size/cost trade-off |
Compared with TC1303A-AD0EUN and TPS65023RGZR, TC1303B-AG0EUN uniquely provides LDO-monitored push-pull power-good signaling in a compact 3×3 mm DFN, making it optimal for space-constrained, single-processor systems where I/O rail integrity dictates system readiness.
Availability
TC1303B-AG0EUN is available at Aetrix Electronics and suitable for cellular handsets, USB-powered medical sensors, and industrial data loggers requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for TC1303B-AG0EUN 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 devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC1303 family was designed specifically for portable, battery-powered applications demanding high integration, ultra-low quiescent current, and robust dual-rail power delivery in minimal PCB area.
FAQ
What output voltages does the TC1303B-AG0EUN provide?
The TC1303B-AG0EUN provides fixed 1.8 V on its buck output (VOUT1) and fixed 3.3 V on its LDO output (VOUT2). These values are factory-trimmed and require no external feedback resistors. The part number suffix "AG0EUN" explicitly denotes this 1.8 V / 3.3 V configuration in Microchip's ordering matrix.
How does the power-good (PG) function operate in TC1303B-AG0EUN?
In TC1303B-AG0EUN, the PG pin is a push-pull output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of 3.3 V and deasserts when falling below 92%, with a fixed 300 ms delay. This behavior is hardwired for the TC1303B variant and differs from TC1303A (buck-monitored) and TC1303C (dual-monitored).
Can TC1303B-AG0EUN operate from a single 3.3 V input source?
Yes - TC1303B-AG0EUN supports input voltages from 2.7 V to 5.5 V. With a 3.3 V input, the buck regulator (1.8 V output) operates efficiently in PWM mode, while the LDO (3.3 V output) functions in dropout with ~137 mV headroom required - meaning it remains functional as long as input stays ≥3.437 V. Below that, VOUT2 regulation is lost.
What is the minimum output capacitance required for stable operation of TC1303B-AG0EUN?
TC1303B-AG0EUN requires a minimum of 1 µF ceramic capacitor on VOUT2 (LDO) and 4.7 µF on VOUT1 (buck) for stable operation across temperature and load. These values are specified in the datasheet's typical application circuits and validated for phase margin >45°. Using smaller values may cause instability or excessive output ripple.
Does TC1303B-AG0EUN support independent enable control of its two outputs?
Yes - TC1303B-AG0EUN provides fully independent shutdown control: SHDN1 enables/disables only the buck output (VOUT1), and SHDN2 enables/disables only the LDO output (VOUT2). Both inputs are active-high (≥45% VIN threshold), allowing precise sequencing - for example, enabling VOUT2 first to power peripherals before asserting VOUT1 for the processor core.
TC1303B-AG0EUN 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:
- 3.3V, 500mA
- Voltage/Current - Output 2:
- 2.7V, 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-AG0EUN FAQ
1.How can I place an order for TC1303B-AG0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-AG0EUN 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-AG0EUN reliable?
The price and inventory of TC1303B-AG0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-AG0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-AG0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-AG0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-AG0EUN?
TC1303B-AG0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-AG0EUN 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-AG0EUN?
For technical support, including TC1303B-AG0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-AG0EUN requirements.
6.How does Aetrix verify that TC1303B-AG0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-AG0EUN 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-AG0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-AG0EUN?
All TC1303B-AG0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-AG0EUN, 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-AG0EUN part is unused and in its original packaging.
Return procedure for TC1303B-AG0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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