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Microchip Technology TC1303B-ZI0EUNTR
- Part No.:
- TC1303B-ZI0EUNTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-ZI0EUNTR.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,363
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Product details
Overview
TC1303B-ZI0EUNTR 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 90% typical efficiency at 2.0 MHz switching frequency, features 65 µA total quiescent current, and supports -40°C to +125°C operation in a 10-pin 3×3 mm DFN package - ideal for space-constrained portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-ZI0EUNTR datasheet, TC1303B-ZI0EUNTR pinout, TC1303B-ZI0EUNTR application, or TC1303B-ZI0EUNTR equivalent, key selection considerations include its LDO-monitored push-pull PG output, independent SHDN1/SHDN2 control, adjustable VOUT1 (0.8–4.5 V), fixed VOUT2 options (1.5/1.8/2.5/3.3 V), and thermal/UVLO/short-circuit protection.
Technical Context
The TC1303B-ZI0EUNTR implements a fixed-frequency 2.0 MHz PWM buck stage with automatic transition to PFM mode under light load to maintain ultra-low IQ, while its LDO uses internal compensation and achieves 137 mV dropout at 200 mA. The power-good signal is actively driven as a push-pull output referenced solely to VOUT2 regulation, with 94% threshold and 300 ms delay - designed specifically for processor reset sequencing in battery-powered systems.
Its dual shutdown architecture allows independent enable/disable of buck (SHDN1) and LDO (SHDN2) outputs, enabling flexible power sequencing without external logic. Both regulators are internally compensated and require only ceramic output capacitors: 4.7 µF for VOUT1 and 1 µF for VOUT2 - minimizing BOM count and PCB area in compact designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA max - supports core voltage rails for microcontrollers and FPGAs |
| LDO Output Current | 300 mA max - powers I/O, sensors, or analog circuitry requiring low-noise bias |
| Switching Frequency | 2.0 MHz (±0.4 MHz) - enables use of small 4.7 µH inductors and reduces EMI filtering burden |
| Quiescent Current | 65 µA typical - extends battery life in always-on portable applications |
| LDO Dropout Voltage | 137 mV @ 200 mA - maintains regulation down to VIN2 = VOUT2 + 0.137 V |
| Power-Good Delay | 300 ms nominal - provides stable reset assertion after LDO output reaches regulation |
| Operating Temp Range | -40°C to +125°C junction - qualified for industrial and automotive-adjacent environments |
Pinout & Package
TC1303B-ZI0EUNTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. The package supports high-power-density layouts and offers θJA = 41°C/W on a 4-layer board with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown input | Active-high logic input (>45% VIN); controls LDO enable independently of buck stage |
| 2 (VIN2) | LDO input supply | Accepts 2.7–5.5 V; must be tied closely to VIN1 to minimize noise coupling |
| 3 (VOUT2) | LDO regulated output | Fixed 1.5/1.8/2.5/3.3 V output; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-good indicator | Push-pull output asserting when VOUT2 ≥ 94% of nominal; drives processor RESET directly |
| 5 (AGND) | Analog ground reference | Separate ground node for feedback and sensing; must connect to quiet analog ground plane |
| 6 (PGND) | Power ground return | High-current return path for buck switch; connects to power ground plane with low-inductance trace |
| 7 (LX) | Buck switch node | Connects to external inductor; carries high di/dt switching current - requires tight layout |
| 8 (VIN1) | Buck input supply | Accepts 2.7–5.5 V; shared input with VIN2 in most implementations |
| 9 (SHDN1) | Buck shutdown input | Active-high logic input (>45% VIN); enables/disables buck regulator independently |
| 10 (VFB1/VOUT1) | Buck feedback or output | Configurable: for adjustable VOUT1, connect voltage divider center; for fixed output, tie directly to VOUT1 |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shutdown | SHDN1 and SHDN2 allow staggered power-up/down of buck and LDO outputs without external timing components |
| LDO-monitored push-pull PG | TC1303B-specific PG output actively drives high/low - eliminates need for external pull-up resistor in reset circuits |
| Internally compensated regulators | Eliminates external compensation networks; reduces design risk and component count for both buck and LDO loops |
| Low-noise LDO output | 1.8 µV/√Hz output noise and 62 dB PSRR below 100 Hz - suitable for ADC references and RF bias rails |
| Thermal & UVLO protection | 165°C thermal shutdown with 10°C hysteresis and 2.55 V ±150 mV undervoltage lockout - ensures safe operation under fault conditions |
Applications
| Portable Medical Instrumentation | USB-Powered Peripherals |
|---|---|
Use Scenario: Powering handheld glucose meters or pulse oximeters with dual-rail requirements (1.8 V MCU core + 3.3 V sensor interface). IC Role / Device Role / Timing Role: TC1303B-ZI0EUNTR supplies regulated VOUT1 (1.8 V) and VOUT2 (3.3 V) from a single 3.7 V Li-ion cell, with PG asserting reset after LDO stabilization. Use Value: 65 µA quiescent current extends battery runtime; 137 mV LDO dropout preserves operation down to 3.43 V cell voltage. | Use Scenario: Providing clean, sequenced power to USB-C audio adapters with integrated DAC and headphone amplifier. IC Role / Device Role / Timing Role: TC1303B-ZI0EUNTR generates 1.2 V for digital logic and 2.5 V for analog bias, using independent SHDN1/SHDN2 to coordinate startup with USB enumeration. Use Value: Push-pull PG output directly drives system enable logic; 2.0 MHz switching minimizes inductor size for ultra-thin form factors. |
| Industrial Handheld Terminals | Low-Power IoT Edge Sensors |
Use Scenario: Powering ruggedized barcode scanners operating across -20°C to +70°C ambient with wide-input USB or adapter supply. IC Role / Device Role / Timing Role: TC1303B-ZI0EUNTR delivers 3.3 V (VOUT2) to display driver and 1.5 V (VOUT1) to ARM Cortex-M core, with PG monitoring LDO for reliable boot. Use Value: -40°C to +125°C junction rating ensures reliability in uncontrolled environments; 90% peak efficiency reduces thermal load in sealed enclosures. | Use Scenario: Supplying dual rails to LoRaWAN sensor nodes powered by coin-cell or energy-harvesting sources. IC Role / Device Role / Timing Role: TC1303B-ZI0EUNTR powers 1.8 V MCU and 3.3 V radio transceiver from 3.0–4.2 V input, entering PFM mode during sleep to sustain multi-year battery life. Use Value: Automatic PWM-to-PFM transition cuts IQ to 38 µA (buck only) and 46 µA (LDO only); 1 µF LDO output cap saves board space vs. traditional solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16311-H/MS | Single-output 600 mA buck only; no integrated LDO or PG; requires external LDO for dual-rail | Suitable only when LDO rail is omitted or implemented separately | Select if higher buck current (600 mA) is required and LDO functionality is handled externally |
| TPS65023RSBR | Triple-output (2 buck + 1 LDO); 2.25 MHz switching; I²C programmable; larger 4×4 mm QFN | Supports dynamic voltage scaling and more complex sequencing via I²C | Select when programmability, higher integration, or additional output flexibility justifies larger footprint and cost |
Compared with MCP16311-H/MS and TPS65023RSBR, TC1303B-ZI0EUNTR offers the smallest solution size for fixed dual-rail applications with guaranteed LDO-monitored reset timing, while avoiding I²C overhead or external component dependencies.
Availability
TC1303B-ZI0EUNTR is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered peripherals, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for TC1303B-ZI0EUNTR 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, FPGA, and power management semiconductors, serving industrial, automotive, communications, and consumer markets with high-reliability silicon and development tools.
The TC1303 family was engineered to deliver cost-effective, space-efficient dual-rail power solutions for battery-operated portable electronics - emphasizing low IQ, internal compensation, and robust protection in minimal footprints.
FAQ
What output voltages does TC1303B-ZI0EUNTR support for VOUT1 and VOUT2?
TC1303B-ZI0EUNTR supports an adjustable VOUT1 from 0.8 V to 4.5 V (via external resistor divider on VFB1) and fixed VOUT2 options of 1.5 V, 1.8 V, 2.5 V, or 3.3 V. The specific VOUT2 voltage is determined by the device variant suffix - ZI0EUNTR corresponds to 1.8 V LDO output, as confirmed in Microchip's ordering information and DS21949C revision C.
How does the power-good (PG) function operate in TC1303B-ZI0EUNTR?
In TC1303B-ZI0EUNTR, the PG output is a push-pull driver that asserts high when VOUT2 reaches ≥94% of its nominal value and holds for ≥300 ms. It monitors only the LDO output - not the buck output - and is designed to drive processor RESET pins directly without external pull-up resistors, distinguishing it from TC1303A/C variants with open-drain PG.
Can TC1303B-ZI0EUNTR operate from a single 3.3 V input source?
Yes, TC1303B-ZI0EUNTR can operate from a single 3.3 V input applied to both VIN1 and VIN2, provided the selected VOUT1 and VOUT2 voltages satisfy dropout constraints: VOUT1 ≤ 3.3 V – 0.28 V (buck dropout) and VOUT2 ≤ 3.3 V – 0.137 V (LDO dropout). For example, 1.8 V/3.3 V dual output is fully supported with 3.3 V input.
What is the thermal performance of TC1303B-ZI0EUNTR in the 3×3 mm DFN package?
TC1303B-ZI0EUNTR 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 thermal vias under the exposed pad. This enables continuous 500 mA buck and 300 mA LDO operation up to +85°C ambient when properly laid out - verified per Microchip DS21949C page 10.
Does TC1303B-ZI0EUNTR require external compensation components for stability?
No, TC1303B-ZI0EUNTR features both regulators as internally compensated - neither the buck nor LDO loop requires external compensation capacitors or resistors. Stability is guaranteed with the recommended 4.7 µF input/output capacitors for VOUT1 and 1 µF for VOUT2, as specified in DS21949C page 5 typical application circuits.
TC1303B-ZI0EUNTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-ZI0EUNTR FAQ
1.How can I place an order for TC1303B-ZI0EUNTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZI0EUNTR 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-ZI0EUNTR reliable?
The price and inventory of TC1303B-ZI0EUNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZI0EUNTR is usually 5 days.
3.What payment methods are accepted for TC1303B-ZI0EUNTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZI0EUNTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZI0EUNTR?
TC1303B-ZI0EUNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZI0EUNTR 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-ZI0EUNTR?
For technical support, including TC1303B-ZI0EUNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZI0EUNTR requirements.
6.How does Aetrix verify that TC1303B-ZI0EUNTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZI0EUNTR 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-ZI0EUNTR meets industry standards.
7.What is the process for return or replacement of TC1303B-ZI0EUNTR?
All TC1303B-ZI0EUNTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZI0EUNTR, 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-ZI0EUNTR part is unused and in its original packaging.
Return procedure for TC1303B-ZI0EUNTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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