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Microchip Technology TC1303B-VS0EMFTR
- Part No.:
- TC1303B-VS0EMFTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-VS0EMFTR.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,591
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Product details
Overview
TC1303B-VS0EMFTR 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 the power-good (PG) output monitoring only the LDO output (VOUT2). It delivers 1.8 V on VOUT1 and 3.3 V on VOUT2, operates from 2.7–5.5 V input, achieves >90% typical efficiency at heavy load, and features 65 µA total quiescent current. It is designed for space-constrained portable electronics requiring tightly regulated dual-rail supplies.
For engineers reviewing the TC1303B-VS0EMFTR datasheet, TC1303B-VS0EMFTR pinout, TC1303B-VS0EMFTR application, or TC1303B-VS0EMFTR equivalent, key selection criteria include LDO-monitored PG behavior, independent shutdown control (SHDN1/SHDN2), 2.0 MHz fixed-frequency PWM operation with automatic PFM transition, 137 mV typical dropout at 200 mA on VOUT2, and compatibility with 1 µF ceramic output capacitors.
Technical Context
The TC1303B-VS0EMFTR implements a synchronous buck topology with integrated high- and low-side MOSFETs (RDS(on) = 450 mΩ each), fixed 2.0 MHz switching frequency under heavy load, and seamless auto-transition to PFM mode at light loads to maintain ultra-low IQ. Its LDO stage uses internal compensation and delivers 300 mA with 137 mV typical dropout voltage at 200 mA.
Power-good logic is configured exclusively for VOUT2 regulation (per TC1303B variant), with push-pull output, 94% VOUT2 threshold high, 89% threshold low, 2% hysteresis, and a 300 ms active timeout period - optimized for processor reset timing in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 1.8 V, 500 mA max; adjustable range 0.8–4.5 V; 2.0 MHz fixed PWM + auto PFM mode |
| Output 2 (LDO) | 3.3 V, 300 mA max; 137 mV typical dropout @ 200 mA; internally compensated |
| Power-Good Logic | Monitors only VOUT2; push-pull output; 94% VOUT2 threshold high; 300 ms active timeout |
| Quiescent Current | 65 µA typical total device IQ; 38 µA buck-only; 46 µA LDO-only |
| Input Voltage Range | 2.7 V to 5.5 V; UVLO at 2.55 V nominal with 200 mV hysteresis |
| Operating Temp | -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 (4-layer board) |
Pinout & Package
The TC1303B-VS0EMFTR 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 | Active-high logic input; enables/disables VOUT2; VIH ≥ 45% VIN, VIL ≤ 15% VIN |
| 2 (VIN2) | LDO input supply | Input for 3.3 V LDO stage; must be tied closely to VIN1; supports 2.7–5.5 V |
| 3 (VOUT2) | LDO regulated output | 3.3 V / 300 mA output; requires ≥1 µF ceramic capacitor to AGND |
| 4 (PG) | Power-good indicator | Push-pull output asserting when VOUT2 ≥ 94% of 3.3 V; 300 ms timeout after fault |
| 5 (AGND) | Analog ground reference | Low-noise ground return for feedback and regulation circuits; tie to analog ground plane |
| 6 (PGND) | Power ground | High-current ground return for buck switch node (LX); separate from AGND for noise isolation |
| 7 (LX) | Buck switch node | Connection to external inductor; integrates synchronous N/P-channel MOSFETs |
| 8 (VIN1) | Buck input supply | Input for 1.8 V buck stage; must be tied closely to VIN2; supports 2.7–5.5 V |
| 9 (SHDN1) | Buck shutdown control | Active-high logic input; enables/disables VOUT1; VIH ≥ 45% VIN, VIL ≤ 15% VIN |
| 10 (VFB1/VOUT1) | Buck feedback/output | Fixed 1.8 V output pin; no external divider needed; connects directly to VOUT1 trace |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output integration | Combines 500 mA buck + 300 mA LDO in single 3×3 mm DFN, reducing BOM count and PCB area vs. discrete solutions |
| Ultra-low quiescent current | 65 µA total IQ enables >1-week battery runtime in always-on portable devices with light-load duty cycles |
| LDO-monitored power-good | PG asserts only when VOUT2 is in regulation - critical for systems where auxiliary rail integrity determines system readiness |
| Independent shutdown control | SHDN1 and SHDN2 allow staggered enable/disable sequencing of VOUT1 and VOUT2 without external logic |
| Robust protection suite | Includes UVLO, overtemperature shutdown (165°C), overcurrent limiting, and short-circuit protection on both outputs |
Applications
| Cellular Handsets | USB-Powered Peripherals |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.8 V core) and RF transceiver bias (3.3 V). IC Role / Device Role / Timing Role: Primary dual-output PMIC providing sequenced, low-noise supplies with LDO-monitored reset signaling. Use Value: Eliminates need for separate LDO and buck ICs; 137 mV dropout ensures stable 3.3 V under USB 5 V min (4.75 V) input variation. | Use Scenario: Compact bus-powered hub or dongle requiring clean 1.8 V logic and 3.3 V I/O rails. IC Role / Device Role / Timing Role: Single-chip solution delivering regulated dual outputs with PG-driven host reset coordination. Use Value: 65 µA IQ extends battery backup life; 2.0 MHz switching allows use of tiny 4.7 µH inductors and 4.7 µF input caps. |
| Portable Medical Sensors | Handheld PDAs |
Use Scenario: Powering low-power ADC front-end (1.8 V) and display interface (3.3 V) in battery-operated diagnostic tools. IC Role / Device Role / Timing Role: Precision dual-rail regulator with tight output tolerance (±0.3%) and low 1.8 µV/√Hz output noise on LDO. Use Value: PSRR of 62 dB at ≤100 Hz suppresses USB or battery ripple from sensitive analog measurements. | Use Scenario: Supplying application processor core (1.8 V) and memory/I/O (3.3 V) in legacy PDA platforms. IC Role / Device Role / Timing Role: Integrated PMIC with independent shutdown enabling dynamic power gating of subsystems. Use Value: Independent SHDN1/SHDN2 pins allow software-controlled power-down of CPU or peripherals without affecting other rails. |
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 600 mA buck only; no integrated LDO or PG; requires external LDO for second rail | Lacks LDO-monitored PG and dual-rail integration; needs extra components for 3.3 V rail | Select when only buck regulation is required and board space permits discrete LDO + PG circuit |
| TPS65136RSAT | 300 mA buck + 300 mA LDO; PG monitors buck output only; 1.2 MHz switching; higher IQ (120 µA) | PG behavior mismatch (buck-monitored vs. TC1303B's LDO-monitored); less efficient at light loads | Select only if buck-rail monitoring aligns with system reset architecture and higher IQ is acceptable |
Compared with MCP16311-H/MS and TPS65136RSAT, the TC1303B-VS0EMFTR uniquely provides LDO-monitored power-good in a fully integrated dual-output package with industry-leading 65 µA quiescent current - making it optimal for portable systems where auxiliary rail integrity drives system boot readiness and battery life is critical.
Availability
TC1303B-VS0EMFTR is available at Aetrix Electronics and suitable for cellular handsets, USB-powered peripherals, and portable medical sensors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303B-VS0EMFTR 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The TC1303 series is part of Microchip's integrated power management portfolio, designed specifically for space- and efficiency-constrained portable electronics needing dual-rail regulation with intelligent power sequencing and monitoring.
FAQ
What output voltages does the TC1303B-VS0EMFTR deliver?
The TC1303B-VS0EMFTR delivers a fixed 1.8 V output on VOUT1 (buck regulator) and a fixed 3.3 V output on VOUT2 (LDO). These values are factory-set per the "VS0" suffix designation and require no external feedback resistors. The buck output supports adjustable configurations in other variants, but TC1303B-VS0EMFTR is strictly fixed 1.8 V / 3.3 V.
How does the power-good (PG) function work on the TC1303B-VS0EMFTR?
The TC1303B-VS0EMFTR configures its PG pin as a push-pull output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of 3.3 V and deasserts when VOUT2 falls below 89% of 3.3 V, with built-in 300 ms timeout to hold reset during transient dips - a behavior specific to the TC1303B variant.
Can the TC1303B-VS0EMFTR operate from a single 3.7 V Li-ion battery?
Yes. The TC1303B-VS0EMFTR supports input voltages from 2.7 V to 5.5 V, fully covering the discharge range of a single-cell Li-ion battery (typically 4.2 V down to 3.0 V). Its 137 mV dropout on VOUT2 ensures stable 3.3 V output even at end-of-discharge (3.0 V input), and UVLO prevents malfunction below 2.55 V.
What is the thermal performance of the TC1303B-VS0EMFTR in its DFN package?
In a standard 4-layer PCB with internal ground plane and two vias under the exposed pad, the TC1303B-VS0EMFTR exhibits a junction-to-ambient thermal resistance (θJA) of 41°C/W. With maximum power dissipation limited by thermal shutdown at 165°C, this enables continuous 500 mA buck + 300 mA LDO operation at ambient temperatures up to +85°C under typical layout conditions.
Does the TC1303B-VS0EMFTR require external compensation components?
No. Both the buck regulator and LDO stages of the TC1303B-VS0EMFTR are internally compensated. The design requires only a 4.7 µH power inductor and 4.7 µF input capacitor for the buck stage, and a single 1 µF ceramic capacitor on VOUT2 - eliminating loop compensation design effort and improving design robustness.
TC1303B-VS0EMFTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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:
- 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-DFN (3x3)
TC1303B-VS0EMFTR FAQ
1.How can I place an order for TC1303B-VS0EMFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-VS0EMFTR 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-VS0EMFTR reliable?
The price and inventory of TC1303B-VS0EMFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-VS0EMFTR is usually 5 days.
3.What payment methods are accepted for TC1303B-VS0EMFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-VS0EMFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-VS0EMFTR?
TC1303B-VS0EMFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-VS0EMFTR 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-VS0EMFTR?
For technical support, including TC1303B-VS0EMFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-VS0EMFTR requirements.
6.How does Aetrix verify that TC1303B-VS0EMFTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-VS0EMFTR 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-VS0EMFTR meets industry standards.
7.What is the process for return or replacement of TC1303B-VS0EMFTR?
All TC1303B-VS0EMFTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-VS0EMFTR, 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-VS0EMFTR part is unused and in its original packaging.
Return procedure for TC1303B-VS0EMFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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