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Microchip Technology TC1303B-ZA0EUN
- Part No.:
- TC1303B-ZA0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-ZA0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,545
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Product details
Overview
TC1303B-ZA0EUN 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 (VOUT2). It delivers 1.8 V at 500 mA and 2.5 V at 300 mA, operates from 2.7–5.5 V input, and features 65 µA typical quiescent current and 137 mV typical dropout voltage @ 200 mA - ideal for battery-powered portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-ZA0EUN datasheet, TC1303B-ZA0EUN pinout, TC1303B-ZA0EUN application, or TC1303B-ZA0EUN equivalent, key selection criteria include its LDO-monitored PG output, independent SHDN2 control, 2.0 MHz fixed-frequency PWM operation with automatic PFM transition, 10-pin DFN package (3×3 mm), and -40°C to +125°C junction temperature rating.
Technical Context
The TC1303B-ZA0EUN implements a synchronous buck stage with integrated P-channel and N-channel MOSFETs (RDS(on) = 450 mΩ each), operating at a fixed 2.0 MHz switching frequency under heavy load and transitioning automatically to pulse-frequency modulation (PFM) at light loads to maintain ultra-low quiescent current. Its LDO stage uses internal compensation and requires only a single 1 µF ceramic output capacitor.
Power-good functionality is implemented as a push-pull output (PG) that asserts when VOUT2 reaches ≥94% of regulation, with 300 ms active timeout and 165 µs delay; this PG signal is explicitly tied to the LDO output per TC1303B variant specification - unlike TC1303A (buck-monitored) or TC1303C/TC1304 (dual-monitored).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 500 mA max, adjustable 0.8–4.5 V or fixed 0.8/1.2/1.5/1.8/2.5/3.3 V; 2.0 MHz PWM with PFM mode transition |
| Output 2 (LDO) | 300 mA max, fixed 1.5/1.8/2.5/3.3 V; 137 mV dropout @ 200 mA; requires only 1 µF ceramic output cap |
| Power-Good (PG) | Push-pull output monitoring VOUT2 only; 94% threshold high, 89% low, 300 ms timeout, 165 µs delay |
| Quiescent Current | 65 µA typical total device IQ (buck + LDO active); 38 µA buck-only, 46 µA LDO-only |
| Input Voltage Range | 2.7 V to 5.5 V; undervoltage lockout at 2.55 V nominal with 200 mV hysteresis |
| Operating Temperature | -40°C to +125°C junction; thermal shutdown at 165°C with 10°C hysteresis |
| Package | 10-pin 3×3 mm DFN (exposed pad tied to AGND); θJA = 41°C/W on 4-layer board |
Pinout & Package
TC1303B-ZA0EUN is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. Pin numbering follows standard DFN orientation (pin 1 top-left, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control input | Active-high logic input; >45% VIN enables LDO, <15% VIN disables it; independent of buck control |
| 2 (VIN2) | LDO input supply | Accepts 2.7–5.5 V; must be routed with minimal trace length to VIN1; powers LDO stage only |
| 3 (VOUT2) | LDO regulated output | Delivers fixed 2.5 V @ up to 300 mA; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-good status output | Push-pull output indicating VOUT2 ≥94% regulation; drives processor reset directly |
| 5 (AGND) | Analog ground reference | Must connect to clean analog ground plane; separate from PGND; ties to EP |
| 6 (PGND) | Power ground return | High-current return path for buck switch node (LX); connects to power ground plane |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor; integrates P/N-MOSFETs; requires low-ESR input cap |
| 8 (VIN1) | Buck input supply | Accepts 2.7–5.5 V; shared with VIN2 via short PCB trace; powers buck stage only |
| 9 (SHDN1) | Buck shutdown control input | Active-high logic input; >45% VIN enables buck, <15% VIN disables it; independent of SHDN2 |
| 10 (VFB1/VOUT1) | Buck feedback or output | For fixed-output variants like TC1303B-ZA0EUN: direct connection to 1.8 V buck output (VOUT1) |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shutdown control | SHDN1 disables buck only; SHDN2 disables LDO only - enables flexible power sequencing in multi-rail systems |
| Ultra-low quiescent current | 65 µA typical total IQ supports >1-week battery life in always-on portable medical sensors |
| LDO-monitored power-good | PG asserts only when VOUT2 is stable - critical for systems where auxiliary bias rail must be validated before processor boot |
| Internally compensated regulators | Eliminates need for external compensation components; reduces BOM count and layout complexity |
| Robust protection suite | Includes UVLO, overtemperature shutdown (165°C), output short-circuit limiting (240 mA avg), and LX diode protection |
Applications
| USB-Powered Portable Instrument | Handheld Medical Diagnostic Device |
|---|---|
Use Scenario: A portable blood glucose meter powered via USB 5 V input requiring clean 1.8 V for MCU core and stable 2.5 V for analog sensor front-end. IC Role / Device Role / Timing Role: TC1303B-ZA0EUN provides dual regulated rails with LDO-monitored PG ensuring sensor bias is valid before MCU initialization. Use Value: 137 mV LDO dropout enables full 2.5 V output even as USB voltage sags to 2.7 V; 65 µA IQ extends battery backup runtime. |
Use Scenario: A handheld ECG monitor using lithium-ion battery (2.7–4.2 V) needing precise 1.8 V digital supply and low-noise 2.5 V analog reference. IC Role / Device Role / Timing Role: TC1303B-ZA0EUN's buck stage supplies low-noise 1.8 V; LDO delivers PSRR >62 dB @ 100 Hz for analog circuitry. Use Value: 1.8 V buck efficiency >90% at 100 mA reduces thermal load; 1 µF LDO output cap minimizes board area in compact enclosure. |
| Low-Power Cellular IoT Node | Industrial Handheld Scanner |
Use Scenario: An NB-IoT asset tracker operating from primary Li-SOCl₂ cell (3.6 V) with deep-sleep duty cycle demanding microamp-level system IQ. IC Role / Device Role / Timing Role: TC1303B-ZA0EUN powers modem (1.8 V) and RF front-end (2.5 V); PG signal triggers wake-up only after both rails stabilize. Use Value: Automatic buck PFM mode reduces IQ to 38 µA during sleep; LDO's 25 ppm/°C tempco ensures ADC reference stability across temperature. |
Use Scenario: A rugged barcode scanner with wide ambient temperature range (-20°C to +70°C) requiring reliable dual-rail startup under cold conditions. IC Role / Device Role / Timing Role: TC1303B-ZA0EUN delivers 1.8 V/500 mA and 2.5 V/300 mA while maintaining regulation down to -40°C junction. Use Value: Guaranteed operation to -40°C enables use in refrigerated logistics; 10-pin DFN footprint supports high-density PCB layout. |
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-ZA0EUN | Monitors both buck and LDO outputs for PG assertion; same pinout and electrical specs otherwise | Required where system reset must wait for both rails to stabilize - e.g., FPGA-based designs with strict sequencing | Select TC1303C-ZA0EUN only if dual-rail PG validation is mandatory; TC1303B-ZA0EUN suffices when LDO rail governs system readiness |
| TPS65023RSBR | Triple-output (2 buck + 1 LDO); higher IQ (120 µA); 16-pin QFN; no LDO-specific PG option | Used in OMAP/ARM application processors needing three rails; lacks dedicated LDO-monitored PG | Choose TPS65023RSBR for complex SoC power trees; TC1303B-ZA0EUN is optimal for cost-sensitive dual-rail systems prioritizing LDO rail integrity |
Compared with TC1303C-ZA0EUN, TC1303B-ZA0EUN offers simpler PG logic focused solely on VOUT2 - reducing design risk in applications where auxiliary bias stability determines system readiness. Versus TPS65023RSBR, it delivers lower IQ and smaller footprint but targets narrower dual-rail use cases.
Availability
TC1303B-ZA0EUN is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for TC1303B-ZA0EUN 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 global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability and long-life product support.
The TC1303 family was designed for space-constrained, battery-operated portable electronics requiring high-efficiency dual-rail power conversion with minimal external components and robust fault protection.
FAQ
What output voltages does the TC1303B-ZA0EUN provide?
The TC1303B-ZA0EUN delivers a fixed 1.8 V output from its synchronous buck regulator (VOUT1) and a fixed 2.5 V output from its low-dropout linear regulator (VOUT2). These values are factory-programmed and non-adjustable; the "ZA0" suffix in TC1303B-ZA0EUN confirms the 1.8 V / 2.5 V configuration. Both outputs are internally compensated and require no external feedback resistors.
How does the power-good (PG) function work on the TC1303B-ZA0EUN?
The TC1303B-ZA0EUN features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal 2.5 V value and remains active for a guaranteed 262 ms minimum timeout period. This behavior is specific to the TC1303B variant - unlike TC1303A (buck-monitored) or TC1303C (dual-monitored) - and is intended to signal processor reset readiness based on auxiliary rail stability.
Can the TC1303B-ZA0EUN operate from a single input source?
Yes, the TC1303B-ZA0EUN is designed to operate from a single 2.7–5.5 V input applied to both VIN1 and VIN2. The datasheet explicitly states that VIN1 and VIN2 should be connected together with short PCB traces. This simplifies power routing in compact layouts and ensures coordinated operation of the buck and LDO stages without requiring separate input supplies.
What is the thermal performance of the TC1303B-ZA0EUN in its DFN package?
In its 10-pin 3×3 mm DFN package with exposed pad, the TC1303B-ZA0EUN achieves 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 pad. This allows continuous 500 mA buck and 300 mA LDO operation at ambient temperatures up to +85°C without forced airflow, supported by internal thermal shutdown at 165°C with 10°C hysteresis.
Does the TC1303B-ZA0EUN require external compensation components?
No, the TC1303B-ZA0EUN does not require external compensation components for either regulator. Both the synchronous buck and LDO stages are fully internally compensated, as confirmed in the Features section of the datasheet. This eliminates the need for external RC networks or type-II/type-III compensators, reducing bill-of-materials cost and PCB area while simplifying layout for first-pass success.
TC1303B-ZA0EUN 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:
- 3.3V, 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-ZA0EUN FAQ
1.How can I place an order for TC1303B-ZA0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZA0EUN 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-ZA0EUN reliable?
The price and inventory of TC1303B-ZA0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZA0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-ZA0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZA0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZA0EUN?
TC1303B-ZA0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZA0EUN 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-ZA0EUN?
For technical support, including TC1303B-ZA0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZA0EUN requirements.
6.How does Aetrix verify that TC1303B-ZA0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZA0EUN 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-ZA0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-ZA0EUN?
All TC1303B-ZA0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZA0EUN, 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-ZA0EUN part is unused and in its original packaging.
Return procedure for TC1303B-ZA0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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