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Microchip Technology TC1303B-PG0EUN
- Part No.:
- TC1303B-PG0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-PG0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,709
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Product details
Overview
TC1303B-PG0EUN 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 focused on the LDO output. It delivers 1.8 V (buck) and 3.3 V (LDO) fixed outputs, operates from 2.7–5.5 V input, achieves >90% peak efficiency at 2.0 MHz switching frequency, and supports -40°C to +125°C junction temperature - used in portable medical instruments requiring stable dual-rail biasing.
For engineers reviewing the TC1303B-PG0EUN datasheet, TC1303B-PG0EUN pinout, TC1303B-PG0EUN application, or TC1303B-PG0EUN equivalent, key selection criteria include LDO-monitored PG functionality, independent shutdown control per rail, 137 mV typical dropout at 200 mA, internal compensation, and DFN/MSOP package compatibility for space-constrained USB-powered systems.
Technical Context
The TC1303B-PG0EUN implements a fixed-frequency PWM buck stage (2.0 MHz nominal) with automatic transition to PFM mode under light load to maintain ultra-low quiescent current (65 µA typical total IQ). Its LDO output is internally compensated and requires only a single 1 µF ceramic capacitor.
Power-good logic is configured as a push-pull output (unlike open-drain variants) and monitors regulation of VOUT2 only - asserting high when VOUT2 reaches ≥94% of nominal and holding active for 262 ms minimum after valid regulation is lost. UVLO (2.55 V typ), thermal shutdown (165°C), and overcurrent protection are integrated.
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 core voltage supply of low-power microcontrollers or FPGAs. |
| LDO Output Current | 300 mA max - powers I/O peripherals, sensors, or RF sections requiring low-noise bias. |
| LDO Dropout Voltage | 137 mV typical @ 200 mA - enables operation with <300 mV headroom, critical for battery-end-of-life support. |
| Power-Good Output | Push-pull, monitors VOUT2 only, 94% threshold, 262 ms timeout - directly drives processor RESET with no external pull-up. |
| Total Quiescent Current | 65 µA typical - extends battery life in always-on portable devices such as handheld diagnostics. |
| Operating Junction Temp | -40°C to +125°C - qualified for industrial and automotive cabin-adjacent medical applications. |
Pinout & Package
TC1303B-PG0EUN is available in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), pin-compatible with the MSOP variant. 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 LDO independently of buck stage. |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1 (buck input); must be routed with minimal trace length to reduce noise coupling. |
| 3 (VOUT2) | LDO regulated output | Delivers fixed 3.3 V (or other standard options); requires ≥1 µF ceramic capacitor to AGND. |
| 4 (PG) | Power-good indicator | Push-pull output signaling VOUT2 regulation status; sinks/source up to 1.2 mA. |
| 5 (AGND) | Analog ground reference | Separate ground node for feedback and sensing; must connect to low-impedance analog ground plane. |
| 6 (PGND) | Power ground return | High-current return path for buck switch; isolated from AGND except at single-point star ground. |
| 7 (LX) | Buck switch node | Connects to external inductor; carries high di/dt switching current - requires tight layout and Kelvin connection. |
| 8 (VIN1) | Buck input supply | Main input for switching regulator; shares source with VIN2 but routed separately for optimal EMI control. |
| 9 (SHDN1) | Buck shutdown control | Active-high logic input (>45% VIN); independent enable/disable of buck stage. |
| 10 (VFB1/VOUT1) | Buck feedback/sense | For fixed-output versions like PG0EUN, connects directly to VOUT1 (1.8 V); sets regulation point. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staggered power sequencing - e.g., disable LDO first during system sleep to avoid backfeed. |
| Internally compensated LDO | Eliminates need for external compensation network; reduces BOM count and layout sensitivity. |
| Automatic PWM-to-PFM transition | Maintains high efficiency across 0.1–500 mA load range without control-loop reconfiguration or external bias. |
| Low-noise LDO output | 1.8 µV/√Hz output noise (1 kHz) and 62 dB PSRR (<100 Hz) enable clean analog/RF supply rails. |
| Integrated protection | UVLO, thermal shutdown (165°C), and short-circuit current limiting prevent damage during fault conditions. |
Applications
| Portable Medical Diagnostics | USB-Powered Test Equipment |
|---|---|
Use Scenario: Handheld blood glucose meter with LCD display and Bluetooth LE radio. IC Role / Device Role / Timing Role: Provides 1.8 V core voltage for ARM Cortex-M0+ MCU and 3.3 V for sensor interface and BLE transceiver. Use Value: LDO-monitored PG ensures reliable MCU reset before sensor initialization; 137 mV dropout extends usable battery range by >15 minutes at end-of-life. | Use Scenario: Field-deployable oscilloscope probe with integrated ADC and USB 2.0 interface. IC Role / Device Role / Timing Role: Generates clean 3.3 V analog supply for 12-bit SAR ADC and 1.8 V digital core for FPGA-based signal processing. Use Value: Push-pull PG output directly asserts USB suspend/resume handshake; internal compensation avoids layout-sensitive stability tuning. |
| Industrial Handheld Terminals | Wearable Health Monitors |
Use Scenario: Ruggedized barcode scanner operating in warehouses from -20°C to +60°C ambient. IC Role / Device Role / Timing Role: Dual-rail supply for CMOS image sensor (3.3 V) and low-power application processor (1.8 V). Use Value: -40°C to +125°C rating ensures startup reliability in cold storage environments; 2.0 MHz switching enables compact 4.7 µH inductor. | Use Scenario: Clinical-grade pulse oximeter with optical sensor, analog front-end, and BLE SoC. IC Role / Device Role / Timing Role: Powers photodiode amplifier (3.3 V LDO) and digital controller (1.8 V buck) from coin-cell or rechargeable LiPo. Use Value: 65 µA total IQ minimizes standby drain; independent SHDN pins allow dynamic rail gating during optical measurement cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303A-PG0EUN | PG monitors buck output (VOUT1), not LDO; PG is open-drain, requiring external pull-up. | Suitable where primary rail (e.g., processor core) must trigger reset, not auxiliary rail. | Select when system reset must be synchronized to main CPU supply stability, not peripheral bias. |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO), higher current (1 A buck), I²C programmable, larger QFN package. | Used in complex embedded systems needing configurable sequencing and higher power density. | Choose for designs requiring >500 mA buck current, software-controlled voltage scaling, or multi-rail coordination. |
Compared with TC1303A-PG0EUN, TC1303B-PG0EUN provides LDO-centric power-good assertion ideal for sensor-peripheral reset timing; versus TPS65023RGZR, it offers lower cost, smaller footprint, and simpler integration where triple output or I²C control is unnecessary.
Availability
TC1303B-PG0EUN is available at Aetrix Electronics and suitable for portable medical diagnostics, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TC1303B-PG0EUN 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, serving industrial, automotive, consumer, and communications markets.
The TC1303 series is designed specifically for space-constrained, battery-operated portable electronics requiring highly integrated, low-quiescent dual-rail power conversion with precise power-good signaling.
FAQ
What output voltages does the TC1303B-PG0EUN provide?
The TC1303B-PG0EUN provides fixed 1.8 V from its synchronous buck regulator (VOUT1) and fixed 3.3 V from its low-dropout linear regulator (VOUT2). These values are factory-set and do not require external resistor dividers. The part number suffix "PG0EUN" confirms this specific dual-voltage configuration, with power-good monitoring tied exclusively to the 3.3 V LDO output.
How does the power-good (PG) function operate in TC1303B-PG0EUN?
In TC1303B-PG0EUN, the PG pin is a push-pull output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value and remains active for a guaranteed minimum of 262 ms after VOUT2 falls below regulation. This behavior differs from TC1303A variants, which monitor the buck output and use open-drain PG.
Can TC1303B-PG0EUN support independent enable/disable of each regulator?
Yes. TC1303B-PG0EUN features two dedicated shutdown inputs: SHDN1 controls the buck regulator and SHDN2 controls the LDO. Both are active-high logic inputs requiring >45% of VIN to enable. This allows independent sequencing - for example, enabling the buck first to stabilize VOUT1 before enabling the LDO to power sensitive analog circuitry.
What is the thermal performance of TC1303B-PG0EUN in the DFN package?
The TC1303B-PG0EUN in its 10-lead 3×3 mm DFN package has a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two vias under the exposed pad. This enables continuous 500 mA buck and 300 mA LDO operation at ambient temperatures up to +85°C without forced airflow, provided the EP is soldered to AGND.
Does TC1303B-PG0EUN require external compensation components?
No. Both the buck regulator and LDO in TC1303B-PG0EUN are internally compensated. The buck stage uses a fixed 2.0 MHz oscillator and integrated gate drivers; the LDO requires only a single 1 µF ceramic output capacitor on VOUT2. No external RC networks, compensation capacitors, or feedback resistors are needed for stable operation.
TC1303B-PG0EUN 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:
- 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-PG0EUN FAQ
1.How can I place an order for TC1303B-PG0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-PG0EUN 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-PG0EUN reliable?
The price and inventory of TC1303B-PG0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-PG0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-PG0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-PG0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-PG0EUN?
TC1303B-PG0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-PG0EUN 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-PG0EUN?
For technical support, including TC1303B-PG0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-PG0EUN requirements.
6.How does Aetrix verify that TC1303B-PG0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-PG0EUN 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-PG0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-PG0EUN?
All TC1303B-PG0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-PG0EUN, 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-PG0EUN part is unused and in its original packaging.
Return procedure for TC1303B-PG0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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