My Inquiry
My Account
Microchip Technology TC1303B-VS0EUN
- Part No.:
- TC1303B-VS0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-VS0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,351
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TC1303B-VS0EUN 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 1.8V/500 mA and 3.3V/300 mA outputs, operates from 2.7–5.5V input, achieves >90% peak efficiency at 2.0 MHz switching frequency, and supports -40°C to +125°C junction temperature - ideal for portable medical instruments requiring stable dual-rail biasing.
For engineers reviewing the TC1303B-VS0EUN datasheet, TC1303B-VS0EUN pinout, TC1303B-VS0EUN application, or TC1303B-VS0EUN equivalent, key selection criteria include its LDO-monitored PG output, independent shutdown control per rail, 65 µA typical quiescent current, 137 mV typical dropout at 200 mA, and compatibility with 1 µF ceramic output capacitors on both outputs.
Technical Context
The TC1303B-VS0EUN implements a fixed-frequency 2.0 MHz PWM buck stage with automatic transition to PFM mode under light load to minimize quiescent current, while its LDO uses internal compensation and requires only a single 1 µF output capacitor. The device integrates undervoltage lockout (2.55 V nominal), overtemperature protection (165°C trip), and short-circuit protection on both outputs.
Its power-good (PG) signal is a push-pull output referenced exclusively to VOUT2 regulation (94% threshold, 300 ms delay), distinguishing it from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored). Shutdown logic is independent: SHDN1 controls the buck, SHDN2 controls the LDO, enabling flexible power sequencing in battery-powered systems.
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 supply without external pre-regulation. |
| Buck Output Current | 500 mA - sufficient for core voltage of low-power microcontrollers or DSPs (e.g., 1.8 V @ 500 mA). |
| LDO Output Current | 300 mA - powers I/O peripherals, sensors, or RF sections (e.g., 3.3 V @ 300 mA) with minimal board area. |
| LDO Dropout Voltage | 137 mV typical @ 200 mA - enables operation with <200 mV headroom, critical for low-input-voltage battery end-of-life. |
| Quiescent Current | 65 µA typical - extends battery life in always-on portable devices such as handheld medical monitors. |
| Switching Frequency | 2.0 MHz fixed (±0.4 MHz) - allows use of compact 4.7 µH inductors and reduces EMI filtering requirements. |
| Power-Good Delay | 300 ms active timeout - provides reliable processor reset timing after LDO stabilization, per JEDEC JESD22-A103. |
Pinout & Package
TC1303B-VS0EUN is housed in a 10-lead 3×3 mm DFN package with exposed thermal pad (EP), rated for θJA = 41°C/W on a 4-layer PCB with internal ground plane and 2 vias under EP. Pin 1 is marked by a dot; EP must be soldered to AGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control input | Active-high logic (>45% VIN); enables/disables 300 mA LDO independently of buck regulator. |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1 (2.7–5.5 V); must be routed with minimal trace length to reduce noise coupling. |
| 3 (VOUT2) | LDO regulated output | Fixed 3.3 V output; requires ≥1 µF ceramic capacitor to AGND for stability and transient response. |
| 4 (PG) | Power-good status output | Push-pull output asserting high when VOUT2 reaches 94% of 3.3 V; drives processor RESET directly. |
| 5 (AGND) | Analog ground reference | Must connect to clean analog ground plane; separate from PGND to avoid switching noise injection. |
| 6 (PGND) | Power ground return | High-current return path for buck switch node (LX); ties to AGND only at single point near EP. |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor and 4.7 µF input/output capacitors; carries high di/dt ripple current. |
| 8 (VIN1) | Buck input supply | Primary input for 500 mA buck stage; tied to VIN2 on PCB for shared input source. |
| 9 (SHDN1) | Buck shutdown control input | Active-high logic (>45% VIN); enables/disables buck regulator independently for dynamic power gating. |
| 10 (VFB1/VOUT1) | Buck feedback/sense node | Configured as VOUT1 (1.8 V fixed) for this variant; no external divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-rail shutdown | SHDN1 and SHDN2 allow staggered enable/disable of buck and LDO - essential for controlled power sequencing in multi-voltage SoCs. |
| Internally compensated LDO | Eliminates need for external compensation network; works with 1 µF ceramic output capacitor - reduces BOM count and layout area. |
| PFM/PWM auto-transition | Seamlessly shifts from 2.0 MHz PWM to pulse-frequency modulation below ~10 mA load - maintains >85% efficiency down to µA loads. |
| LDO-monitored push-pull PG | PG asserts high only when VOUT2 (3.3 V) is within 94% tolerance; eliminates external comparator and pull-up resistor. |
| Thermal and short-circuit protection | 165°C thermal shutdown with 10°C hysteresis and cycle-by-cycle current limiting on both outputs - ensures robustness in unattended operation. |
Applications
| Portable Medical Instrumentation | USB-Powered Diagnostic Device |
|---|---|
Use Scenario: Handheld blood glucose meter operating from single-cell Li-ion battery (2.7–4.2 V) with LCD display and Bluetooth LE radio. IC Role / Device Role / Timing Role: Provides 1.8 V core supply for ARM Cortex-M0+ MCU and 3.3 V I/O rail for sensor interface and BLE transceiver; PG asserts RESET after LDO stabilizes. Use Value: 65 µA quiescent current extends battery life beyond 12 months in standby; 137 mV LDO dropout sustains 3.3 V output down to 3.43 V battery voltage. |
Use Scenario: USB bus-powered ECG front-end module drawing up to 450 mA peak during signal acquisition. IC Role / Device Role / Timing Role: Generates 1.8 V for ADC/DSP and 3.3 V for op-amps and USB PHY; PG synchronizes firmware initialization with stable 3.3 V rail. Use Value: 2.0 MHz switching enables use of 2.2 µH inductor (reducing solution size by 30% vs. 500 kHz designs); integrated UVLO prevents brownout resets during USB port hot-plug. |
| Industrial Handheld Terminal | Low-Power IoT Sensor Node |
Use Scenario: Ruggedized barcode scanner with cold-cathode backlight and Wi-Fi module, powered by replaceable Li-ion pack. IC Role / Device Role / Timing Role: Supplies 1.8 V to application processor and 3.3 V to imager sensor and RF front-end; independent SHDN2 enables rapid LDO disable during sleep. Use Value: Dual independent shutdown pins reduce system sleep current to <1 µA; -40°C to +125°C rating ensures operation in outdoor warehouse environments. |
Use Scenario: Battery-operated soil moisture sensor transmitting data every 15 minutes via LoRaWAN, requiring ultra-low idle power. IC Role / Device Role / Timing Role: Powers 1.8 V microcontroller and 3.3 V analog sensor chain; PG signal triggers wake-up interrupt upon LDO readiness after deep-sleep exit. Use Value: 300 ms PG delay aligns with sensor warm-up time; 1 µF LDO output cap minimizes footprint in space-constrained PCB design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303B-VM0EUN | Same package and pinout; delivers 1.2 V/500 mA buck + 2.5 V/300 mA LDO instead of 1.8 V/3.3 V. | Suitable for systems requiring lower core voltage (e.g., 1.2 V FPGA fabric) and 2.5 V analog rails. | Select when target voltage combination matches VM0EUN's fixed outputs; no layout change needed. |
| TPS650350RGER | 3.3 V/600 mA buck + 1.8 V/300 mA LDO; 2.25 MHz switching; requires external compensation on LDO; open-drain PG. | Higher buck current and tighter LDO accuracy (±1%), but lacks independent LDO shutdown and has higher IQ (85 µA). | Prefer for higher-current buck needs or tighter LDO tolerance; verify PG interface compatibility (open-drain vs. push-pull). |
Compared with TC1303B-VS0EUN, TC1303B-VM0EUN offers identical functionality with different fixed voltages - enabling drop-in replacement where voltage rails match - while TPS650350RGER trades independent shutdown and lower IQ for higher buck current and improved LDO precision, requiring redesign of PG and shutdown logic.
Availability
TC1303B-VS0EUN is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered diagnostic devices, industrial handheld terminals, and low-power IoT sensor nodes requiring stable dual-rail supply with precise power sequencing and long battery life.
Supply support for TC1303B-VS0EUN 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 components, and power management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon solutions.
The TC1303 series was designed specifically for space-constrained, battery-powered applications needing efficient dual-rail generation with minimal external components - emphasizing low quiescent current, small footprint, and robust protection features.
FAQ
What output voltages does the TC1303B-VS0EUN provide?
The TC1303B-VS0EUN provides fixed 1.8 V at up to 500 mA from its synchronous buck regulator and fixed 3.3 V at up to 300 mA from its low-dropout linear regulator. These outputs are factory-trimmed and require no external feedback resistors - the VFB1/VOUT1 pin is internally connected to deliver 1.8 V, and VOUT2 is hardwired to 3.3 V.
How does the power-good (PG) output function on the TC1303B-VS0EUN?
The TC1303B-VS0EUN features a push-pull PG output that monitors only the LDO output (VOUT2 = 3.3 V). It asserts high when VOUT2 reaches 94% of its nominal value (3.102 V), with a 300 ms active timeout period and 2% hysteresis. This differs from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored), making TC1303B-VS0EUN optimal for systems where LDO stability is the critical startup condition.
Can the TC1303B-VS0EUN operate from a single-cell Li-ion battery?
Yes, the TC1303B-VS0EUN operates across an input range of 2.7 V to 5.5 V, fully covering the discharge curve of a single-cell Li-ion battery (2.7–4.2 V). Its 137 mV typical dropout at 200 mA ensures the 3.3 V LDO remains regulated until the battery drops below 3.43 V, and its 65 µA quiescent current maximizes runtime in standby modes.
What is the thermal performance of the TC1303B-VS0EUN in its DFN package?
In its 10-lead 3×3 mm DFN package with exposed pad, the TC1303B-VS0EUN 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. Its thermal shutdown activates at 165°C with 10°C hysteresis, ensuring safe operation even under sustained 500 mA buck + 300 mA LDO load at +85°C ambient.
Does the TC1303B-VS0EUN require external compensation components?
No, the TC1303B-VS0EUN is fully internally compensated for both regulators. The buck stage uses fixed-frequency PWM with automatic PFM transition, and the LDO requires only a single 1 µF ceramic output capacitor on VOUT2 - eliminating external RC networks, reducing BOM cost, and simplifying layout for compact portable designs.
TC1303B-VS0EUN 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:
- 1.2V, 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-VS0EUN FAQ
1.How can I place an order for TC1303B-VS0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-VS0EUN 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-VS0EUN reliable?
The price and inventory of TC1303B-VS0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-VS0EUN is usually 5 days.
3.What payment methods are accepted for TC1303B-VS0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-VS0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-VS0EUN?
TC1303B-VS0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-VS0EUN 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-VS0EUN?
For technical support, including TC1303B-VS0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-VS0EUN requirements.
6.How does Aetrix verify that TC1303B-VS0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303B-VS0EUN 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-VS0EUN meets industry standards.
7.What is the process for return or replacement of TC1303B-VS0EUN?
All TC1303B-VS0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-VS0EUN, 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-VS0EUN part is unused and in its original packaging.
Return procedure for TC1303B-VS0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TC1303B-VS0EUN Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
