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Microchip Technology TC1303B-PI0EUN
- Part No.:
- TC1303B-PI0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-PI0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,236
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Product details
Overview
TC1303B-PI0EUN 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 94% regulation threshold accuracy, 137 mV typical dropout at 200 mA for VOUT2, and operates across –40°C to +125°C junction temperature. It targets portable battery-powered systems requiring tightly sequenced, low-noise dual-rail supplies - such as USB-powered medical instruments or handheld PDAs.
For engineers reviewing the TC1303B-PI0EUN datasheet, TC1303B-PI0EUN pinout, TC1303B-PI0EUN application, or TC1303B-PI0EUN equivalent, key selection considerations include its LDO-monitored PG output (distinct from TC1303A/C), independent SHDN1/SHDN2 control, 2.0 MHz fixed-frequency PWM operation, PFM mode transition under light load, and compatibility with 1 µF ceramic output capacitance on VOUT2.
Technical Context
The TC1303B-PI0EUN implements a synchronous buck stage with integrated P-channel and N-channel MOSFETs (RDS(on) = 450 mΩ each), operating at 2.0 MHz nominal switching frequency with automatic PWM-to-PFM mode transition to maintain ultra-low quiescent current (65 µA typical total IQ). Its LDO stage uses internal compensation and achieves 137 mV dropout at 200 mA while supporting standard fixed outputs (1.5V, 1.8V, 2.5V, 3.3V).
Power-good logic is dedicated to VOUT2 regulation with push-pull output (unlike open-drain in TC1303A/C), 94% high-threshold and 92% low-threshold hysteresis, 300 ms active timeout, and ±30 ppm/°C tempco. UVLO triggers at 2.55 V (typ) 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 core voltage supply of ARM Cortex-M microcontrollers or FPGA I/O banks. |
| LDO Output Current | 300 mA max - powers analog sensors, RF front-ends, or low-noise peripherals requiring clean bias. |
| LDO Dropout Voltage | 137 mV typical @ 200 mA - enables operation with <100 mV headroom above output, critical for 1.8 V/2.5 V rails from 3.3 V input. |
| Power-Good Logic | Monitors VOUT2 only, push-pull output, 94% threshold - provides direct reset assertion for processors tied to LDO rail. |
| Quiescent Current | 65 µA typical total - extends battery life in always-on sensor nodes or standby modes. |
| Operating Temperature | –40°C to +125°C junction - qualified for industrial and automotive cabin-adjacent applications. |
Pinout & Package
TC1303B-PI0EUN is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), pin-compatible with the MSOP variant. The package supports high thermal efficiency (θJA = 41°C/W on 4-layer board) and requires EP soldered to AGND for safe operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | Active-high enable for LDO (VOUT2); >45% VIN = ON, <15% VIN = OFF - allows independent LDO sequencing or disable during sleep. |
| 2 | VIN2 | LDO input supply - must be tied closely to VIN1; accepts same 2.7–5.5 V input as buck stage. |
| 3 | VOUT2 | Regulated LDO output - requires ≥1 µF ceramic capacitor to AGND; delivers fixed 1.5V/1.8V/2.5V/3.3V per variant. |
| 4 | PG | Push-pull power-good output - asserts high when VOUT2 reaches 94% of target; used directly for processor RESET. |
| 5 | AGND | Analog ground reference - separate low-impedance return path for feedback and regulation circuitry; must tie to system AGND plane. |
| 6 | PGND | Power ground - high-current return for buck switch node (LX); must be routed separately from AGND and joined at single point. |
| 7 | LX | Buck switch node - connects to external 4.7 µH inductor; carries pulsed current up to 700 mA peak. |
| 8 | VIN1 | Buck input supply - shares input source with VIN2; feeds synchronous rectifier stage. |
| 9 | SHDN1 | Active-high enable for buck regulator (VOUT1); independent control enables staggered startup/shutdown. |
| 10 | VFB1/VOUT1 | Buck feedback/sense - connected to output divider (adjustable) or directly to VOUT1 (fixed); sets 0.8–4.5 V output range. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | Separate SHDN1 (buck) and SHDN2 (LDO) pins enable precise power sequencing - e.g., hold LDO active while buck ramps down. |
| Internally compensated LDO | Eliminates need for external compensation components; stable with only 1 µF ceramic output capacitor - reduces BOM count and PCB area. |
| 2.0 MHz fixed-frequency PWM | Enables use of small 4.7 µH inductors and 4.7 µF input/output capacitors - ideal for space-constrained portable designs. |
| Automatic PWM-to-PFM transition | Maintains >85% efficiency down to 1 mA load without manual mode control - extends battery runtime in intermittent-sensing applications. |
| LDO-monitored push-pull PG | Provides immediate, rail-referenced reset signal for microcontrollers powered by VOUT2 - no external pull-up or level-shifting required. |
Applications
| USB-Powered Medical Sensors | Handheld Diagnostic PDAs |
|---|---|
Use Scenario: Portable ECG or pulse oximeter powered via USB-C with dual-rail requirements (1.8 V analog front-end + 3.3 V MCU). IC Role / Device Role / Timing Role: TC1303B-PI0EUN generates both rails from 5 V USB input; PG monitors 3.3 V LDO to assert MCU reset on undervoltage. Use Value: Single-chip solution eliminates discrete LDO + buck controller, reducing layout complexity and enabling sub-20 mm² power section. |
Use Scenario: Battery-operated clinical PDA with ARM-based SoC requiring 1.2 V core and 2.5 V I/O supply. IC Role / Device Role / Timing Role: TC1303B-PI0EUN's buck delivers 1.2 V core; LDO delivers 2.5 V I/O; independent SHDN pins allow controlled power-down sequence. Use Value: 65 µA quiescent current extends standby time beyond 72 hours on 500 mAh Li-ion cell. |
| Industrial Handheld Scanners | Low-Power IoT Edge Nodes |
Use Scenario: Rugged barcode scanner using 3.7 V Li-ion battery, needing 1.5 V laser driver bias and 3.3 V logic rail. IC Role / Device Role / Timing Role: TC1303B-PI0EUN's LDO supplies clean 1.5 V to laser diode driver; buck supplies 3.3 V logic; PG ensures reliable boot after cold start. Use Value: 137 mV LDO dropout enables full 1.5 V output even at end-of-battery (3.2 V input), maintaining scan accuracy. |
Use Scenario: Wireless environmental sensor node with BLE SoC (3.3 V) and analog temperature/humidity IC (1.8 V). IC Role / Device Role / Timing Role: TC1303B-PI0EUN's buck powers BLE radio; LDO powers analog sensor; PG tied to sensor enable pin ensures synchronized wake-up. Use Value: Push-pull PG drives sensor enable directly - no external buffer needed - cutting bill-of-materials by one component. |
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-PI0EUN | PG monitors buck output (VOUT1), not LDO; open-drain PG output requires external pull-up. | Suitable when system reset must track core voltage (e.g., CPU VDD), not peripheral rail. | Select TC1303A-PI0EUN only if VOUT1 is the primary regulated rail requiring PG supervision. |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO), 2.25 MHz switching, I2C programmability, but 1.5 mA higher IQ (1.2 mA vs. 65 µA). | Supports complex multi-rail SoCs (e.g., OMAP), but over-spec'd for simple dual-rail portable devices. | Choose TPS65023RGZR only when additional output or digital configuration is required - otherwise TC1303B-PI0EUN offers superior efficiency and footprint. |
Compared with TC1303A-PI0EUN, TC1303B-PI0EUN provides LDO-specific reset signaling essential for peripherals; versus TPS65023RGZR, it delivers 18× lower quiescent current and 40% smaller footprint - making it optimal for cost- and battery-sensitive dual-rail applications.
Availability
TC1303B-PI0EUN is available at Aetrix Electronics and suitable for USB-powered medical instruments, handheld diagnostic PDAs, industrial scanners, and low-power IoT edge nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303B-PI0EUN 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 company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and embedded system integration.
The TC1303 family was designed for space-constrained, battery-operated portable electronics requiring highly integrated, low-quiescent dual-rail power solutions - emphasizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the power-good (PG) behavior of TC1303B-PI0EUN?
The TC1303B-PI0EUN features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches 94% of its nominal voltage and deasserts low when falling below 92%, with a 300 ms active timeout period. This differs from TC1303A (which monitors VOUT1) and TC1303C/TC1304 (which monitor both outputs). The push-pull structure eliminates need for an external pull-up resistor.
Can TC1303B-PI0EUN support adjustable buck output voltage?
Yes, TC1303B-PI0EUN supports adjustable VOUT1 from 0.8 V to 4.5 V via external resistor divider connected to the VFB1/VOUT1 pin. The internal feedback reference is 0.8 V (±2.5%), and the device maintains ±0.2% line/load regulation. Fixed-output variants (e.g., 1.2 V, 1.8 V) are also available, but TC1303B-PI0EUN itself is a fixed-VOUT2 version with adjustable or fixed VOUT1 depending on external components.
What is the minimum output capacitance required for VOUT2 on TC1303B-PI0EUN?
TC1303B-PI0EUN requires a minimum 1 µF ceramic capacitor on VOUT2 to AGND for stability and transient response. The datasheet confirms stable operation with 1 µF X5R/X7R types; larger values (e.g., 2.2 µF) improve load-step immunity but are not mandatory. No ESR requirement is specified - unlike many LDOs, TC1303B-PI0EUN is internally compensated and insensitive to capacitor ESR.
How does TC1303B-PI0EUN handle light-load efficiency?
TC1303B-PI0EUN automatically transitions from PWM to PFM mode when buck load drops below ~10 mA, reducing switching losses and maintaining >85% efficiency down to 1 mA. Total quiescent current remains at 65 µA typical across temperature, and the LDO contributes only 46 µA in shutdown - enabling multi-day battery life in duty-cycled sensor applications.
Is TC1303B-PI0EUN pin-compatible with other TC1303 variants?
Yes, TC1303B-PI0EUN shares identical 10-pin DFN/MSOP pinout with all TC1303A/B/C and TC1304 variants. Pin functions (e.g., SHDN1, SHDN2, PG, VOUT2) are electrically and physically identical across the family - allowing drop-in replacement where functional differences (e.g., PG monitoring target, sequencing logic) are acceptable or configurable in firmware.
TC1303B-PI0EUN 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:
- 2.5V, 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-PI0EUN FAQ
1.How can I place an order for TC1303B-PI0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-PI0EUN 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-PI0EUN reliable?
The price and inventory of TC1303B-PI0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-PI0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-PI0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-PI0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-PI0EUN?
TC1303B-PI0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-PI0EUN 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-PI0EUN?
For technical support, including TC1303B-PI0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-PI0EUN requirements.
6.How does Aetrix verify that TC1303B-PI0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-PI0EUN 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-PI0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-PI0EUN?
All TC1303B-PI0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-PI0EUN, 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-PI0EUN part is unused and in its original packaging.
Return procedure for TC1303B-PI0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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