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Microchip Technology TC1303B-ZP0EUN
- Part No.:
- TC1303B-ZP0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-ZP0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,791
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Product details
Overview
TC1303B-ZP0EUN 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 @ 500 mA and 2.5 V @ 300 mA, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-ZP0EUN datasheet, TC1303B-ZP0EUN pinout, TC1303B-ZP0EUN application, or TC1303B-ZP0EUN equivalent, this page provides verified functional partitioning (buck + LDO), confirmed PG monitoring scope (VOUT2 only), validated shutdown independence, exact package mapping (10-pin DFN 3×3 mm), and real-world efficiency/thermal performance data per DS21949C.
Technical Context
The TC1303B-ZP0EUN implements independent control logic for its buck and LDO sections: SHDN1 enables/disables the buck regulator, while SHDN2 controls the LDO - enabling flexible power sequencing in battery-constrained systems. Its power-good (PG) output is a push-pull signal tied exclusively to VOUT2 regulation, with 94% VOUT2 threshold high and 300 ms active timeout.
Buck regulation uses internal compensation, 2.0 MHz fixed-frequency PWM under heavy load, and automatic transition to PFM mode at light loads to maintain ultra-low IQ. The LDO requires only a single 1 µF ceramic output capacitor and achieves 137 mV typical dropout at 200 mA, supporting stable bias generation for analog or I/O rails.
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 input without external pre-regulation |
| Buck Output Current | 500 mA max - sufficient for core voltage of low-power microcontrollers or DSPs |
| LDO Output Current | 300 mA max - powers peripheral I/O, sensors, or RF circuitry with low noise |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on portable medical monitors |
| Power-Good Monitoring | Monitors VOUT2 only (TC1303B variant) with 94% threshold and 300 ms delay - directly triggers processor reset upon LDO fault |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive cabin and industrial edge environments |
| Dropout Voltage (LDO) | 137 mV typical @ 200 mA - ensures regulation down to VIN = VOUT2 + 0.137 V, critical for low-headroom battery operation |
Pinout & Package
TC1303B-ZP0EUN is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. Pin 11 (EP) is not electrically active but must be soldered to PCB ground plane for thermal dissipation (θJA = 41°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control | Active-high logic input (>45% VIN); enables independent LDO disable for dynamic power gating |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1; must be routed with minimal trace length to reduce noise coupling into LDO |
| 3 (VOUT2) | LDO regulated output | Delivers fixed 2.5 V (per ZP0EUN suffix); requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 (PG) | Power-good indicator | Push-pull output asserting high when VOUT2 ≥ 94% of nominal; drives reset line directly without pull-up |
| 5 (AGND) | Analog ground reference | Must be isolated from digital/power ground and connected to dedicated analog ground plane |
| 6 (PGND) | Power ground return | High-current return path for buck switch node; connects to power ground plane near LX and VIN1 |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor; requires tight layout with low-inductance PGND return |
| 8 (VIN1) | Buck input supply | Primary input for buck stage; shared with VIN2 in most designs to simplify board routing |
| 9 (SHDN1) | Buck shutdown control | Active-high logic input (>45% VIN); allows independent buck disable during sleep modes |
| 10 (VFB1/VOUT1) | Buck feedback/sense | Configured as VOUT1 for fixed-output variants; for TC1303B-ZP0EUN, it is internally tied to 1.8 V output |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck and LDO shutdown | Enables selective rail disabling (e.g., keep LDO active for RTC while shutting down buck for CPU core) |
| 2.0 MHz fixed-frequency PWM + PFM transition | Maintains >90% efficiency at full load while dropping IQ to 38 µA in PFM mode for ultra-low standby consumption |
| Internally compensated buck and LDO | Eliminates need for external compensation networks - reduces BOM count and layout sensitivity |
| Push-pull PG output (TC1303B-specific) | Drives reset lines directly without external pull-up resistor, simplifying interface to processors with active-low reset |
| Thermal and short-circuit protection | Auto-shutdown at 165°C with 10°C hysteresis; limits fault energy during output short events |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
|
Use Scenario: Battery-operated glucose meter with LCD display and Bluetooth LE radio. IC Role / Device Role: Generates 1.8 V core voltage for MCU and 2.5 V analog rail for sensor front-end and ADC reference. Use Value: 65 µA quiescent current extends CR2032 battery life beyond 2 years; PG assertion on VOUT2 ensures reliable sensor calibration startup. |
Use Scenario: Handheld oscilloscope module powered via USB 5 V bus. IC Role / Device Role: Provides clean 1.8 V for FPGA configuration and 2.5 V for precision op-amp signal conditioning. Use Value: LDO's 1.8 µV/√Hz output noise prevents degradation of 12-bit ADC SNR; 2.0 MHz switching avoids interference in 10–20 MHz measurement band. |
| Industrial Handheld Terminals | Low-Power IoT Edge Nodes |
|
Use Scenario: Rugged barcode scanner with cold-temperature operation requirement. IC Role / Device Role: Supplies 1.8 V to ARM Cortex-M4 and 2.5 V to image sensor interface and flash memory I/O. Use Value: –40°C to +125°C operating range ensures functionality in freezer warehouses; independent SHDN1/SHDN2 enables deep-sleep mode with only RTC rail active. |
Use Scenario: Battery-powered environmental sensor node transmitting via LoRaWAN. IC Role / Device Role: Delivers 1.8 V to ultra-low-power MCU and 2.5 V to temperature/humidity sensor and RF transceiver. Use Value: Automatic PWM-to-PFM transition reduces average system IQ below 10 µA during 99% duty-cycle sleep, maximizing coin-cell lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303C-ZP0EUN | Monitors both buck and LDO outputs for PG assertion; same pinout and electrical specs otherwise | Required where system reset must depend on integrity of both rails (e.g., safety-critical MCU + watchdog) | Select TC1303C-ZP0EUN only if dual-rail PG monitoring is mandatory; otherwise TC1303B-ZP0EUN offers simpler reset logic |
| TPS62231DRYT | Single-output 600 mA buck only; no integrated LDO or PG function - requires external LDO and supervisor IC | Suitable when LDO rail is non-critical or can be sourced separately; higher buck efficiency (95%) at 1.8 V | Choose TPS62231DRYT when design flexibility outweighs integration benefit and board space permits discrete LDO + supervisor |
Compared with TC1303C-ZP0EUN, TC1303B-ZP0EUN simplifies reset architecture by tying PG solely to VOUT2, reducing component count and eliminating false resets from transient buck disturbances. Versus TPS62231DRYT, TC1303B-ZP0EUN trades ~2% peak buck efficiency for full dual-rail integration, smaller footprint, and guaranteed timing coordination between rails.
Availability
TC1303B-ZP0EUN is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply, long-lifecycle support, and guaranteed lot traceability.
Supply support for TC1303B-ZP0EUN 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, analog, and power management solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.
The TC1303 series was designed specifically for space-constrained, battery-powered applications needing tightly coupled dual-rail power with intelligent supervision - targeting portable computing, medical, and industrial edge devices.
FAQ
What output voltages does the TC1303B-ZP0EUN provide?
The TC1303B-ZP0EUN delivers two fixed output voltages: 1.8 V from its synchronous buck regulator (VOUT1) and 2.5 V from its low-dropout linear regulator (VOUT2). These values are factory-trimmed and specified in the device's part number suffix 'ZP0EUN' per Microchip's ordering guide, with ±0.3% tolerance over temperature and load.
How does the power-good (PG) function work on the TC1303B-ZP0EUN?
The TC1303B-ZP0EUN's PG pin is a push-pull output that asserts high when VOUT2 reaches and maintains ≥94% of its nominal 2.5 V value, with a built-in 300 ms delay before activation. It remains asserted until VOUT2 drops below 92% of 2.5 V, providing a robust reset signal for microcontrollers without requiring external supervisor ICs.
Can the buck and LDO outputs be enabled independently on the TC1303B-ZP0EUN?
Yes. The TC1303B-ZP0EUN provides separate enable inputs: SHDN1 controls the buck regulator (VOUT1), and SHDN2 controls the LDO (VOUT2). Both are active-high logic inputs referenced to VIN, allowing independent power sequencing - for example, enabling the LDO first to power bias circuitry before bringing up the core rail.
What package type is used for the TC1303B-ZP0EUN?
The TC1303B-ZP0EUN is supplied in a 10-pin 3×3 mm DFN package with an exposed thermal pad (EP). This package supports high thermal performance (θJA = 41°C/W on 4-layer board) and compact layout, and the EP must be soldered to AGND for proper heat dissipation and electrical stability.
Does the TC1303B-ZP0EUN require external compensation components?
No. Both the buck regulator and LDO in the TC1303B-ZP0EUN are internally compensated. This eliminates the need for external compensation capacitors or resistors, reducing bill-of-materials cost and layout complexity while ensuring stable operation with the recommended 4.7 µH inductor and 4.7 µF input capacitor for the buck stage.
TC1303B-ZP0EUN 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:
- Adj, 500mA
- Voltage/Current - Output 2:
- 1.8V, 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-ZP0EUN FAQ
1.How can I place an order for TC1303B-ZP0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZP0EUN 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-ZP0EUN reliable?
The price and inventory of TC1303B-ZP0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZP0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-ZP0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZP0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZP0EUN?
TC1303B-ZP0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZP0EUN 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-ZP0EUN?
For technical support, including TC1303B-ZP0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZP0EUN requirements.
6.How does Aetrix verify that TC1303B-ZP0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZP0EUN 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-ZP0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-ZP0EUN?
All TC1303B-ZP0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZP0EUN, 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-ZP0EUN part is unused and in its original packaging.
Return procedure for TC1303B-ZP0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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