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Microchip Technology TC1303B-ZS0EUN
- Part No.:
- TC1303B-ZS0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-ZS0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,947
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Product details
Overview
TC1303B-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 focused on the LDO output. It delivers 1.8 V at 500 mA (VOUT1) and 3.3 V at 300 mA (VOUT2), operates from 2.7–5.5 V input, features 65 µA typical quiescent current, and supports -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-ZS0EUN datasheet, TC1303B-ZS0EUN pinout, TC1303B-ZS0EUN application, or TC1303B-ZS0EUN equivalent, key selection criteria include its LDO-monitored push-pull PG output, independent SHDN2 control for the LDO, 137 mV typical dropout at 200 mA, 2.0 MHz fixed-frequency PWM operation, and compatibility with 1 µF ceramic output capacitors on VOUT2.
Technical Context
The TC1303B-ZS0EUN implements a synchronous buck stage with PFM/PWM auto-transition and internal compensation, delivering up to 500 mA with ≤280 mV dropout at 3.3 V output. Its LDO stage provides 300 mA with 137 mV typical dropout voltage and ±0.3% output tolerance over temperature.
Power-good logic monitors only the LDO output (VOUT2) with 94% threshold high, 89% threshold low, and 300 ms active timeout - configured as a push-pull output per datasheet Note 2. Shutdown is independently controlled: SHDN1 disables the buck regulator; SHDN2 disables the LDO.
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 rails without external pre-regulation. |
| Buck Output (VOUT1) | 1.8 V fixed @ 500 mA - optimized for processor core supply with 0.5 ms startup time and 2.0 MHz switching frequency. |
| LDO Output (VOUT2) | 3.3 V fixed @ 300 mA - requires only 1 µF ceramic output capacitor; 137 mV dropout enables operation down to 3.437 V input. |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on portable medical sensors with both outputs active. |
| Power-Good Output | Push-pull PG monitoring VOUT2 only - asserts high when VOUT2 ≥ 94% of 3.3 V (≥3.102 V); 300 ms timeout prevents false resets during transient load steps. |
| Operating Temperature | -40°C to +125°C junction - qualified for industrial and automotive cabin-temperature embedded applications. |
| Protection Features | UVLO (2.55 V nominal), overtemperature shutdown (165°C), short-circuit current limiting (240 mA avg on LDO), and internal MOSFET overcurrent protection. |
Pinout & Package
TC1303B-ZS0EUN is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. Pin assignments are validated per DS21949C-page 3 and page 19: SHDN2 (Pin 1), VIN2 (Pin 2), VOUT2 (Pin 3), PG (Pin 4), AGND (Pin 5), PGND (Pin 6), LX (Pin 7), VIN1 (Pin 8), SHDN1 (Pin 9), VFB1/VOUT1 (Pin 10).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN2 (Pin 1) | LDO enable control | Active-high logic input (>45% VIN); enables/disables 300 mA LDO independently of buck stage. |
| VIN2 (Pin 2) | LDO input supply | Accepts same input as VIN1 (2.7–5.5 V); must be routed with minimal trace length to VIN1 for noise coupling control. |
| VOUT2 (Pin 3) | LDO regulated output | Delivers 3.3 V ±0.3%; requires ≥1 µF X5R/X7R ceramic capacitor to AGND for stability and transient response. |
| PG (Pin 4) | Power-good status | Push-pull output indicating VOUT2 regulation; sinks 1.2 mA or sources 300–500 µA depending on VOUT2 level. |
| AGND (Pin 5) | Analog ground reference | Must connect to clean analog ground plane; separate from PGND except at single-point star connection under EP. |
| PGND (Pin 6) | Power ground return | High-current return path for buck switch node (LX); requires low-inductance connection to input/output capacitors. |
| LX (Pin 7) | Buck switch node | Connects to external 4.7 µH inductor; carries pulsed current up to 700 mA peak; sensitive to layout parasitics. |
| VIN1 (Pin 8) | Buck input supply | Primary input for 500 mA buck stage; shares source with VIN2 but requires local 4.7 µF ceramic decoupling. |
| SHDN1 (Pin 9) | Buck enable control | Active-high logic input (>45% VIN); enables/disables buck regulator independently of LDO. |
| VFB1/VOUT1 (Pin 10) | Buck feedback/output | Fixed 1.8 V output pin; no external divider needed; connects directly to load and output capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staged power sequencing: LDO can remain active while buck is disabled for low-power sleep modes. |
| LDO-monitored push-pull PG | Eliminates need for external pull-up resistor; enables direct connection to microcontroller reset pin without level-shifting. |
| Internally compensated buck | Reduces BOM count by removing external compensation network; supports stable operation with standard 4.7 µH inductor and 4.7 µF output capacitor. |
| Low-LDO dropout voltage | 137 mV @ 200 mA allows 3.3 V output from 3.437 V input - critical for extending runtime in single-cell Li-ion systems near end-of-discharge. |
| Ultra-low quiescent current | 65 µA total device IQ enables >10-year shelf life in battery-backed medical diagnostics with both regulators enabled. |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Continuous glucose monitor with BLE radio and analog front-end requiring isolated 1.8 V digital core and 3.3 V analog/RF supply. IC Role / Device Role / Timing Role: Dual-rail PMIC providing sequenced, low-noise, battery-efficient power with PG-driven system reset on LDO undervoltage. Use Value: 137 mV LDO dropout extends usable battery range by 12% vs. competitive 200+ mV solutions; push-pull PG eliminates external pull-up, saving PCB area. | Use Scenario: Handheld oscilloscope module powered via USB 5 V, needing clean 1.8 V FPGA core and 3.3 V ADC/reference supply. IC Role / Device Role / Timing Role: Integrated buck+LDO regulator delivering low-noise 3.3 V for precision ADC and efficient 1.8 V for digital logic, with PG confirming LDO readiness before ADC initialization. Use Value: 2.0 MHz buck switching enables <1 mm² inductor footprint; 1 µF VOUT2 capacitor reduces board area by 60% vs. legacy 10 µF tantalum designs. |
| Industrial Handheld Terminals | Wearable Health Monitors |
Use Scenario: Ruggedized barcode scanner operating across -20°C to +70°C ambient, requiring reliable dual-voltage startup and brownout recovery. IC Role / Device Role / Timing Role: Power supervisor and regulator combining UVLO, thermal shutdown, and LDO-monitored PG to ensure deterministic reset behavior during cold-start and thermal stress. Use Value: -40°C to +125°C junction rating guarantees operation at full spec in sealed enclosures; 300 ms PG delay prevents spurious resets during motor-induced supply dips. | Use Scenario: ECG patch with ultra-low-power MCU and analog signal chain, running 7 days on a 120 mAh coin cell. IC Role / Device Role / Timing Role: Ultra-low-IQ dual-output regulator enabling deep-sleep mode where only the 300 mA LDO remains active to power real-time clock and sensor bias. Use Value: 65 µA total IQ reduces standby current by 40% vs. discrete buck+LDO solutions; independent SHDN2 allows LDO-only wake-up without buck switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303C-ZS0EUN | Monitors both buck and LDO outputs for PG assertion; open-drain PG output instead of push-pull. | Suitable when system-level reset must depend on stability of both rails - e.g., SoC with separate core/I/O domains. | Select TC1303C-ZS0EUN if dual-rail PG monitoring is required; note external pull-up needed for open-drain PG. |
| MCP1826-3302E/DB | Single 3.3 V LDO only (300 mA), no buck stage or integrated PG; requires external buck converter and reset supervisor. | Applicable only when buck regulation is handled separately - increases BOM count and layout complexity. | Choose MCP1826-3302E/DB only if existing design already includes a discrete buck regulator and needs LDO replacement only. |
Compared with TC1303C-ZS0EUN, TC1303B-ZS0EUN offers simpler reset integration via push-pull PG tied solely to the LDO rail, reducing component count; versus MCP1826-3302E/DB, it eliminates the need for an external buck stage and discrete supervisor, cutting solution size by >40%.
Availability
TC1303B-ZS0EUN is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for TC1303B-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, and power management ICs for industrial, automotive, and consumer applications.
The TC1303 family is designed for space-constrained, battery-operated systems needing highly integrated dual-rail power with minimal external components and robust thermal performance.
FAQ
What is the power-good (PG) behavior of TC1303B-ZS0EUN?
The TC1303B-ZS0EUN features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value (e.g., ≥3.102 V for 3.3 V output) and holds active for ≥300 ms after crossing the threshold. The PG pin drives high to VOUT2 level (0.9×VOUT2 minimum) and sinks to ≤0.2 V when low - eliminating need for external pull-up resistors in most microcontroller reset circuits.
Can TC1303B-ZS0EUN operate with a single 3.6 V Li-ion battery?
Yes, TC1303B-ZS0EUN operates across 2.7 V to 5.5 V input, making it fully compatible with single-cell Li-ion batteries (2.7–4.2 V). At 3.6 V input, it delivers 1.8 V @ 500 mA from the buck stage and 3.3 V @ 300 mA from the LDO with 137 mV dropout - ensuring stable 3.3 V output down to 3.437 V input, extending usable battery capacity.
How does TC1303B-ZS0EUN manage efficiency at light loads?
The TC1303B-ZS0EUN automatically transitions from fixed-frequency PWM to pulse-frequency modulation (PFM) mode when buck load drops below ~50 mA. This reduces switching losses and maintains >85% efficiency at 1 mA load, while keeping total device quiescent current at 65 µA typical - critical for battery longevity in always-on sensor nodes.
What capacitor values are required for stable operation of TC1303B-ZS0EUN?
TC1303B-ZS0EUN requires a 4.7 µF ceramic input capacitor on VIN1/VIN2, a 4.7 µH shielded inductor with 4.7 µF ceramic output capacitor on VOUT1, and a minimum 1 µF X5R/X7R ceramic capacitor on VOUT2. All capacitors must be placed within 3 mm of respective pins; the DFN's exposed pad must be soldered to AGND for thermal and electrical integrity.
Is TC1303B-ZS0EUN pin-compatible with other TC1303 variants?
Yes, TC1303B-ZS0EUN shares identical 10-pin DFN/MSOP pinout and footprint with TC1303A, TC1303C, and TC1304 variants. However, functional differences exist: TC1303B uses push-pull PG monitoring VOUT2 only, while TC1303A monitors VOUT1 and TC1303C monitors both outputs - requiring firmware or schematic review before substitution.
TC1303B-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
TC1303B-ZS0EUN FAQ
1.How can I place an order for TC1303B-ZS0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-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 TC1303B-ZS0EUN reliable?
The price and inventory of TC1303B-ZS0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZS0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-ZS0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZS0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZS0EUN?
TC1303B-ZS0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-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 TC1303B-ZS0EUN?
For technical support, including TC1303B-ZS0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZS0EUN requirements.
6.How does Aetrix verify that TC1303B-ZS0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-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 TC1303B-ZS0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-ZS0EUN?
All TC1303B-ZS0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-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 TC1303B-ZS0EUN part is unused and in its original packaging.
Return procedure for TC1303B-ZS0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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