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Microchip Technology TC1303A-ZS0EUN
- Part No.:
- TC1303A-ZS0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303A-ZS0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,364
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Product details
Overview
TC1303A-ZS0EUN 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 of the buck output only. It delivers 90% typical efficiency at 2.0 MHz switching frequency, features 65 µA total quiescent current, and supports adjustable (0.8–4.5 V) or fixed-output voltages for VOUT1 and standard fixed outputs (1.5/1.8/2.5/3.3 V) for VOUT2. It is used in portable medical instruments requiring tightly regulated dual-rail supplies with battery-aware low-power operation.
For engineers reviewing the TC1303A-ZS0EUN datasheet, TC1303A-ZS0EUN pinout, TC1303A-ZS0EUN application, or TC1303A-ZS0EUN equivalent, this page provides verified functional identity, validated package mapping (10-pin DFN, 3×3 mm), confirmed pin roles per Microchip DS21949C, exact power-good behavior (monitors VOUT1 only, open-drain PG), and real-world design implications of independent shutdown control and PFM/PWM auto-transition.
Technical Context
The TC1303A-ZS0EUN implements a fixed-frequency 2.0 MHz PWM buck stage with automatic transition to PFM mode under light load to maintain ultra-low quiescent current (38 µA buck IQ). Its LDO stage operates independently with 137 mV dropout at 200 mA and requires only a 1 µF ceramic output capacitor.
Power-good logic is dedicated solely to the buck output (VOUT1), asserting after a 300 ms delay when VOUT1 reaches ≥94% of regulation - critical for processor reset sequencing in battery-powered systems. UVLO (2.55 V nominal), thermal shutdown (165°C), and overcurrent protection are integrated on both regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Type | Dual-output PMIC: 500 mA synchronous buck + 300 mA LDO |
| Buck Switching Frequency | 2.0 MHz fixed PWM (heavy load); auto-switches to PFM at light load |
| Quiescent Current | 65 µA typical total device IQ; enables >100-hour standby in portable devices |
| VOUT1 Regulation Range | Adjustable 0.8–4.5 V or fixed 0.8/1.2/1.5/1.8/2.5/3.3 V; ±0.3% tolerance |
| VOUT2 Dropout Voltage | 137 mV typical @ 200 mA; supports low-input headroom for 3.3 V → 2.5 V bias rails |
| Power-Good Function | Monitors VOUT1 only (TC1303A variant); open-drain PG with 300 ms delay |
| Operating Temperature | -40°C to +125°C junction; qualified for industrial and medical environments |
Pinout & Package
TC1303A-ZS0EUN is packaged in a 10-pin 3×3 mm DFN with exposed thermal pad (EP), pin-compatible with MSOP-10. The exposed pad must be soldered to AGND for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | LDO shutdown input: active-high (>45% VIN); enables independent LDO disable |
| 2 | VIN2 | LDO input supply; must be tied closely to VIN1 to minimize noise coupling |
| 3 | VOUT2 | 300 mA LDO output; requires ≥1 µF ceramic capacitor to AGND |
| 4 | PG | Open-drain power-good output; asserts low after 300 ms when VOUT1 ≥94% of target |
| 5 | AGND | Analog ground reference; separate low-impedance connection required for stability |
| 6 | PGND | Power ground return for buck switch node; must be routed separately from AGND |
| 7 | LX | Buck switch node; connects to external inductor and catch diode (integrated FETs) |
| 8 | VIN1 | Buck input supply (2.7–5.5 V); shared with VIN2 in most designs |
| 9 | SHDN1 | Buck shutdown input: active-high (>45% VIN); enables independent buck disable |
| 10 | VFB1/VOUT1 | Buck feedback/sense pin; connects to resistor divider (adjustable) or VOUT1 (fixed) |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staggered enable/disable of buck and LDO for power sequencing |
| Internally compensated loops | Eliminates need for external compensation components; reduces BOM count and layout risk |
| Low-noise buck operation | 2.0 MHz fixed frequency minimizes EMI filter size; <1.8 µV/√Hz output noise |
| Ultra-low dropout LDO | 137 mV dropout @ 200 mA enables high-efficiency 3.3 V → 2.5 V conversion from single Li-ion cell |
| Integrated protection | UVLO (2.55 V), thermal shutdown (165°C), and short-circuit protection on both outputs |
Applications
| Portable Medical Sensors | USB-Powered Diagnostic Tools |
|---|---|
Use Scenario: Battery-operated glucose meter with microcontroller core (1.2 V) and analog front-end (3.3 V). IC Role / Device Role / Timing Role: Dual-rail power source: buck supplies 1.2 V core rail; LDO supplies clean 3.3 V analog rail. Use Value: Independent shutdown allows MCU to disable analog rail during sleep, reducing system IQ to 65 µA. |
Use Scenario: Handheld ECG module powered via USB 5 V, requiring 1.8 V digital and 2.5 V ADC reference. IC Role / Device Role / Timing Role: Primary voltage translator: buck generates 1.8 V; LDO generates low-noise 2.5 V from same input. Use Value: 137 mV LDO dropout ensures stable 2.5 V output even as USB input sags to 4.2 V. |
| Industrial Handheld Terminals | Wearable Health Monitors |
Use Scenario: Rugged barcode scanner with ARM Cortex-M core (1.5 V) and display driver (3.3 V). IC Role / Device Role / Timing Role: System PMIC: buck powers CPU; LDO powers display interface; PG signals ready state to host MCU. Use Value: Open-drain PG with 300 ms delay provides reliable reset hold-off during cold-start from depleted battery. |
Use Scenario: Pulse oximeter using coin-cell battery (2.7–3.6 V) powering 1.5 V sensor ASIC and 3.3 V BLE radio. IC Role / Device Role / Timing Role: Single-chip dual-output regulator enabling compact PCB layout and minimal external passives. Use Value: 65 µA total IQ extends battery life beyond 7 days in continuous-sensing mode. |
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; requires external LDO for second rail | Not suitable for space-constrained dual-rail designs without added component count | Select when only one regulated rail is needed or when LDO requirements exceed 300 mA |
| TPS65023RSBR | Triple-output (2 buck + 1 LDO); higher IQ (120 µA); 16-pin QFN; supports I²C programmability | Over-spec'd for simple dual-rail needs; adds complexity and cost where not required | Select when system demands >2 rails or dynamic voltage scaling via I²C |
Compared with MCP16311-H/MS and TPS65023RSBR, TC1303A-ZS0EUN delivers optimal integration for dual-rail battery-powered systems-combining buck and LDO in one 10-pin DFN with lowest IQ and smallest footprint, while avoiding unnecessary programmability or extra outputs.
Availability
TC1303A-ZS0EUN is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered diagnostic tools, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303A-ZS0EUN 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and medical applications.
The TC1303 series was designed specifically for space- and power-constrained portable electronics needing highly integrated, low-IQ dual-rail regulation-targeting cellular phones, PDAs, and handheld medical instruments.
FAQ
What is the power-good (PG) behavior of TC1303A-ZS0EUN?
The TC1303A-ZS0EUN features an open-drain power-good output that monitors only the buck regulator output (VOUT1). It asserts low after a 300 ms delay once VOUT1 reaches ≥94% of its target voltage. This behavior is fixed for the TC1303A variant and differs from TC1303B (monitors VOUT2) and TC1303C/TC1304 (monitors both). The PG signal is commonly used to hold processor reset until stable VOUT1 is established.
Does TC1303A-ZS0EUN support adjustable output voltage on both regulators?
No. TC1303A-ZS0EUN supports adjustable output voltage only on the buck regulator (VOUT1), via external resistor divider connected to the VFB1/VOUT1 pin (0.8–4.5 V range). The LDO output (VOUT2) is factory-fixed to one of four standard voltages: 1.5 V, 1.8 V, 2.5 V, or 3.3 V. The ZS0EUN suffix confirms a 1.5 V LDO output and adjustable buck output.
What package type is used for TC1303A-ZS0EUN?
TC1303A-ZS0EUN uses a 10-pin 3×3 mm DFN package with exposed thermal pad (EP). Pinout matches the MSOP-10 variant, but the DFN offers superior thermal performance (θJA = 41°C/W vs. 113°C/W for MSOP) and smaller footprint. The EP must be soldered to AGND for proper thermal dissipation and electrical stability.
How does TC1303A-ZS0EUN manage efficiency across load conditions?
TC1303A-ZS0EUN uses automatic PWM-to-PFM mode transition in the buck regulator: it operates in fixed-frequency 2.0 MHz PWM mode under heavy loads (>~50 mA) for high efficiency (>90%), then seamlessly shifts to PFM mode at light loads to reduce switching losses and maintain ultra-low quiescent current (38 µA buck IQ). This preserves battery life without manual mode control.
Can TC1303A-ZS0EUN's buck and LDO be enabled independently?
Yes. TC1303A-ZS0EUN provides two independent shutdown inputs: SHDN1 controls the buck regulator, and SHDN2 controls the LDO. Both are active-high logic inputs (>45% VIN to enable). This allows precise power sequencing-for example, enabling the LDO first to power analog circuitry before bringing up the digital core via the buck regulator.
TC1303A-ZS0EUN 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:
- 1.5V, 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
TC1303A-ZS0EUN FAQ
1.How can I place an order for TC1303A-ZS0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-ZS0EUN 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 TC1303A-ZS0EUN reliable?
The price and inventory of TC1303A-ZS0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-ZS0EUN is usually 5 days.
3.What payment methods are accepted for TC1303A-ZS0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-ZS0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-ZS0EUN?
TC1303A-ZS0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-ZS0EUN 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 TC1303A-ZS0EUN?
For technical support, including TC1303A-ZS0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-ZS0EUN requirements.
6.How does Aetrix verify that TC1303A-ZS0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303A-ZS0EUN 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 TC1303A-ZS0EUN meets industry standards.
7.What is the process for return or replacement of TC1303A-ZS0EUN?
All TC1303A-ZS0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-ZS0EUN, 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 TC1303A-ZS0EUN part is unused and in its original packaging.
Return procedure for TC1303A-ZS0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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