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Microchip Technology TC1303B-ZI0EUN
- Part No.:
- TC1303B-ZI0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-ZI0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
TC1303B-ZI0EUN 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 1.8V/500 mA and 3.3V/300 mA outputs, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature - used in portable medical instruments and USB-powered devices requiring tightly regulated dual-rail supplies.
For engineers reviewing the TC1303B-ZI0EUN datasheet, TC1303B-ZI0EUN pinout, TC1303B-ZI0EUN application, or TC1303B-ZI0EUN equivalent, key selection criteria include LDO-specific PG monitoring, independent shutdown control per rail, 137 mV typical dropout at 200 mA, internal compensation, and compatibility with 1 µF ceramic output capacitors for minimal board area.
Technical Context
The TC1303B-ZI0EUN implements a synchronous buck stage with PFM/PWM auto-transition for light/heavy load efficiency optimization, and a separate LDO stage with push-pull power-good output tied exclusively to VOUT2 regulation. Its feedback architecture uses a 0.8 V reference with ±0.3% output voltage tolerance over temperature and line/load variations.
Undervoltage lockout (2.55 V nominal) prevents startup below safe input thresholds, while integrated thermal shutdown (165°C) and overcurrent protection safeguard both regulators. The device supports sequenced enable via independent SHDN1/SHDN2 inputs and requires no external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA maximum - supports processor core rails with stable transient response under full load |
| LDO Output Current | 300 mA maximum - powers auxiliary logic, I/O, or sensors without external pass elements |
| Quiescent Current | 65 µA typical - enables >10-year battery life in always-on portable applications |
| PG Monitoring Target | LDO output only - asserts high when VOUT2 reaches 94% of nominal, with 300 ms delay for reset timing |
| Dropout Voltage (LDO) | 137 mV typical @ 200 mA - allows operation with <2.7 V input for 2.5 V output, minimizing headroom loss |
| Switching Frequency | 2.0 MHz fixed - permits use of compact 4.7 µH inductors and reduces EMI filtering burden |
| Operating Temp Range | –40°C to +125°C - qualified for industrial and automotive cabin-adjacent environments |
Pinout & Package
TC1303B-ZI0EUN is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), pin-compatible with MSOP-10. The DFN variant offers 41°C/W junction-to-ambient thermal resistance on a 4-layer PCB with ground plane and thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN2 | LDO shutdown control | Active-high logic input (>45% VIN); enables/disables LDO independently of buck stage |
| VIN2 | LDO input supply | Accepts 2.7–5.5 V input; must be routed adjacent to VIN1 to minimize noise coupling |
| VOUT2 | LDO regulated output | Delivers fixed 3.3 V (per ZI0EUN suffix); requires ≥1 µF ceramic capacitor to AGND |
| PG | Power-good indicator | Push-pull output asserting high when VOUT2 is within 94–96% of target; 300 ms delay built-in |
| AGND | Analog ground reference | Separate ground return for feedback and sensing; must connect to quiet analog ground plane |
| VFB1/VOUT1 | Buck feedback or output | Configured as VOUT1 for fixed-output variants; connects directly to buck output node |
| PGND | Power ground return | High-current return path for buck switch; isolated from AGND except at single-point star ground |
| LX | Switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace routing |
| VIN1 | Buck input supply | Accepts 2.7–5.5 V; shared with VIN2 in most designs to simplify input filtering |
| SHDN1 | Buck shutdown control | Active-high logic input (>45% VIN); enables/disables buck stage independently of LDO |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staggered power-up/down sequencing between buck and LDO rails |
| Internal compensation | Eliminates need for external compensation network - reduces BOM count and layout sensitivity |
| Low-noise LDO output | 1.8 µV/√Hz output noise and 62 dB PSRR at ≤100 Hz support noise-sensitive analog circuitry |
| Auto PFM/PWM mode transition | Seamlessly shifts from PWM (heavy load) to PFM (light load) without external control or instability |
| Robust protection suite | Includes UVLO (2.55 V), thermal shutdown (165°C), and short-circuit current limiting on both outputs |
Applications
| Portable Medical Instruments | USB-Powered Devices |
|---|---|
Use Scenario: Powering handheld glucose meters and pulse oximeters with dual-voltage sensor front-ends and microcontroller subsystems. IC Role / Device Role / Timing Role: Provides isolated 1.8 V core supply for MCU and 3.3 V bias for analog signal chain, with PG-driven system reset coordination. Use Value: 137 mV LDO dropout enables operation down to 2.7 V input from single-cell Li-ion, extending usable battery range by ~12%. | Use Scenario: Regulating power for USB-C peripheral dongles with embedded USB PHY, flash memory, and status LEDs. IC Role / Device Role / Timing Role: Generates clean 3.3 V LDO rail for USB interface logic and 1.8 V buck rail for low-power MCU, with PG confirming LDO readiness before enumeration. Use Value: 65 µA quiescent current ensures <1 µA system standby draw when both rails are shut down via SHDN1/SHDN2. |
| Cellular Phones | Handheld Industrial Scanners |
Use Scenario: Supplying baseband processor core (1.8 V) and RF transceiver bias (3.3 V) in legacy 2G/3G feature phones. IC Role / Device Role / Timing Role: Dual-output PMIC delivering tightly regulated rails with independent enable timing to meet modem power sequencing requirements. Use Value: 2.0 MHz switching frequency allows use of miniature 1.0 × 1.0 mm inductors, reducing solution footprint by 35% vs. 500 kHz alternatives. | Use Scenario: Powering barcode scanner modules with CMOS image sensor, laser driver, and ARM Cortex-M4 host MCU. IC Role / Device Role / Timing Role: Supplies 3.3 V to image sensor and laser diode driver, and 1.8 V to MCU core - PG signal triggers firmware initialization upon LDO stabilization. Use Value: Push-pull PG output drives reset directly without pull-up resistor, simplifying schematic and improving noise immunity in ESD-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16311-H/MS | Single 600 mA buck only; no integrated LDO or PG - requires external LDO and monitoring circuit | Suitable only when LDO rail is omitted or implemented separately; lacks LDO-specific PG assertion | Select when higher buck current (600 mA) is required and system-level power sequencing is handled externally |
| TPS65023RGZR | Triple-output (2 buck + 1 LDO); 2.25 MHz switching; PG monitors buck1 only; different pinout and enable logic | Used in OMAP-based handhelds; not drop-in due to different PG behavior and lack of LDO-specific monitoring | Choose when three regulated rails are needed and LDO PG is not mandatory - verify sequencing compatibility |
Compared with MCP16311-H/MS and TPS65023RGZR, TC1303B-ZI0EUN uniquely provides LDO-targeted power-good signaling, independent shutdown per rail, and internal compensation - making it optimal for space-constrained dual-rail systems where LDO stability confirmation is critical to system boot integrity.
Availability
TC1303B-ZI0EUN is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered peripherals, and handheld industrial scanners requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC1303B-ZI0EUN 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, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets with high-reliability semiconductor products.
The TC1303 family was designed specifically for cost-sensitive, space-constrained portable electronics needing dual-rail power with minimal external components and guaranteed LDO output validation - targeting battery-operated instrumentation and interface devices.
FAQ
What output voltages does the TC1303B-ZI0EUN provide?
The TC1303B-ZI0EUN delivers a fixed 1.8 V buck output (VOUT1) and a fixed 3.3 V LDO output (VOUT2), as indicated by the "ZI0EUN" part number suffix per Microchip's ordering guide. Both outputs are factory-trimmed to ±0.3% tolerance across temperature and load, and require no external resistive feedback network. The LDO output is monitored by the power-good (PG) signal, which asserts high only when VOUT2 reaches 94% of its nominal value.
How does the power-good (PG) function work on the TC1303B-ZI0EUN?
The TC1303B-ZI0EUN features a push-pull PG output that monitors only the LDO output (VOUT2), distinguishing it from TC1303A (buck-only monitoring) and TC1303C (dual monitoring). PG asserts high when VOUT2 reaches 94% of its target voltage, with built-in 300 ms delay to ensure stable regulation before enabling downstream circuitry. The PG threshold exhibits ±2% hysteresis and 30 ppm/°C tempco, ensuring reliable reset timing across –40°C to +125°C.
Can the TC1303B-ZI0EUN operate from a single 3.3 V input source?
Yes - the TC1303B-ZI0EUN supports input voltages from 2.7 V to 5.5 V on both VIN1 and VIN2, and the datasheet explicitly states VIN1 and VIN2 should be connected together with short board traces. With a 3.3 V input, the 1.8 V buck output operates efficiently (≥85% typical), and the 3.3 V LDO output functions in dropout mode (0 V differential), maintaining regulation as long as input remains ≥3.3 V. Undervoltage lockout activates below 2.55 V.
What is the thermal performance of the TC1303B-ZI0EUN in its DFN package?
The TC1303B-ZI0EUN in the 10-pin 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 thermal vias under the exposed pad. At full 500 mA buck + 300 mA LDO load with 3.6 V input, power dissipation remains below 0.5 W, resulting in <25°C junction rise above ambient - well within the +125°C max rating. Thermal shutdown activates at 165°C with 10°C hysteresis.
Does the TC1303B-ZI0EUN require external compensation components?
No - the TC1303B-ZI0EUN integrates full compensation for both the buck and LDO regulators, eliminating the need for external RC networks or type-II/III compensators. This is confirmed in the Features section of DS21949C and validated by the typical application circuits, which show no compensation components. Designers only need input/output capacitors (4.7 µF input, 4.7 µF buck output, 1 µF LDO output) and a 4.7 µH inductor for complete implementation.
TC1303B-ZI0EUN 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:
- 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-ZI0EUN FAQ
1.How can I place an order for TC1303B-ZI0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZI0EUN 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-ZI0EUN reliable?
The price and inventory of TC1303B-ZI0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZI0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-ZI0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZI0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZI0EUN?
TC1303B-ZI0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZI0EUN 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-ZI0EUN?
For technical support, including TC1303B-ZI0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZI0EUN requirements.
6.How does Aetrix verify that TC1303B-ZI0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZI0EUN 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-ZI0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-ZI0EUN?
All TC1303B-ZI0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZI0EUN, 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-ZI0EUN part is unused and in its original packaging.
Return procedure for TC1303B-ZI0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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