My Inquiry
My Account
Microchip Technology TC1303B-SI0EMF
- Part No.:
- TC1303B-SI0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-SI0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TC1303B-SI0EMF 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. It delivers 1.8 V @ 500 mA and 2.5 V @ 300 mA in typical fixed-output configuration, operates from 2.7–5.5 V input, and features 65 µA total quiescent current and -40°C to +125°C junction temperature range - ideal for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-SI0EMF datasheet, TC1303B-SI0EMF pinout, TC1303B-SI0EMF application, or TC1303B-SI0EMF equivalent, key selection considerations include its LDO-monitored push-pull PG output, independent SHDN2 control, 137 mV dropout at 200 mA, 2.0 MHz fixed-frequency PWM/PFM transition, and compatibility with 1 µF ceramic output capacitors on both rails.
Technical Context
The TC1303B-SI0EMF implements a synchronous buck stage with integrated P- and N-channel MOSFETs (RDS(on) = 450 mΩ each), operating at 2.0 MHz under heavy load and automatically transitioning to PFM mode at light loads to maintain ultra-low IQ. Its LDO stage uses internal compensation and achieves 137 mV dropout at 200 mA with ±0.3% output voltage tolerance over temperature.
Power-good logic is dedicated to VOUT2 regulation (94% threshold, 300 ms delay), with a push-pull PG output - a distinguishing feature versus open-drain variants (TC1303A/C/TC1304). Shutdown is independently controlled via SHDN2 for the LDO, while SHDN1 manages the buck regulator, 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 V cutoff) and USB 5 V supply without external pre-regulation |
| Buck Output Current | 500 mA - sufficient for core voltage of low-power microcontrollers and DSPs |
| LDO Output Current | 300 mA - powers I/O peripherals, sensors, or RF sections requiring low-noise bias |
| Quiescent Current | 65 µA typical - enables >1-year battery life in always-on portable medical monitors |
| LDO Dropout Voltage | 137 mV @ 200 mA - allows operation down to 2.84 V input for 2.7 V LDO output |
| PG Monitoring Target | VOUT2 only - ensures reliable reset assertion for processors powered by the LDO rail |
| Operating Temperature | -40°C to +125°C junction - qualified for industrial and automotive cabin applications |
Pinout & Package
TC1303B-SI0EMF is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for high thermal conductivity and compact layout. Pin 11 (EP) must be soldered to AGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control | Active-high logic input (>45% VIN); enables independent LDO disable for dynamic power gating |
| 2 (VIN2) | LDO input supply | Accepts same input as VIN1; requires short trace coupling to minimize noise coupling into LDO |
| 3 (VOUT2) | LDO regulated output | Delivers fixed 2.5 V (per SI0EMF suffix); requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 (PG) | Power-good indicator | Push-pull output asserting high when VOUT2 reaches 94% of target - eliminates external pull-up resistor |
| 5 (AGND) | Analog ground reference | Separate ground node for feedback and regulation circuitry; must be tied to low-impedance analog ground plane |
| 6 (PGND) | Power ground return | High-current return path for buck switch node; requires direct connection to thermal pad and power ground |
| 7 (LX) | Buck switch node | Connects to external 4.7 µH inductor; carries high di/dt switching current - demands tight loop layout |
| 8 (VIN1) | Buck input supply | Primary input for buck stage; shares source with VIN2 but routed separately for optimal EMI control |
| 9 (SHDN1) | Buck shutdown control | Independent active-high enable for buck regulator - supports staggered startup/shutdown |
| 10 (VFB1/VOUT1) | Buck feedback or output | Configured as VOUT1 in fixed-output variants (SI0EMF = 1.8 V); no external divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck and LDO shutdown | Enables precise power sequencing: e.g., keep LDO active during buck sleep mode for real-time clock backup |
| Push-pull PG output (TC1303B only) | Eliminates need for external pull-up resistor and reduces BOM count and board area |
| Internally compensated LDO | Stable with only 1 µF ceramic output capacitor - cuts cost and footprint vs. traditional 10–22 µF tantalum solutions |
| Automatic PWM-to-PFM transition | Maintains >85% efficiency down to 1 mA load without firmware intervention or external mode control |
| 2.0 MHz fixed-frequency switching | Enables use of small 4.7 µH inductors and 4.7 µF input/output capacitors - critical for space-constrained handheld designs |
| Overtemperature & short-circuit protection | Thermal shutdown at 165°C with 10°C hysteresis prevents latch-up; protects against PCB-level faults without system-level watchdog |
Applications
| Handheld Medical Instrument | USB-Powered Sensor Hub |
|---|---|
Use Scenario: Portable blood glucose meter with LCD display, Bluetooth LE radio, and precision ADC. IC Role / Device Role / Timing Role: Dual-rail power source: 1.8 V for MCU core and 2.5 V for analog front-end and RF transceiver. Use Value: 65 µA quiescent current extends coin-cell battery life; LDO-monitored PG ensures clean reset before ADC sampling begins. |
Use Scenario: Industrial environmental sensor node powered directly from USB host port. IC Role / Device Role / Timing Role: Primary power converter generating stable 1.8 V (MCU) and 2.5 V (sensor bias) from 5 V USB input. Use Value: 2.0 MHz switching avoids AM radio band interference; 137 mV LDO dropout maintains regulation even as USB voltage sags to 4.4 V. |
| Portable Diagnostic Ultrasound Probe | Low-Power Wearable ECG Monitor |
Use Scenario: Battery-operated ultrasound probe with FPGA-based beamformer and analog receive chain. IC Role / Device Role / Timing Role: Supplies 1.8 V to FPGA I/O banks and 2.5 V to high-speed ADC drivers and op-amps. Use Value: Independent SHDN1/SHDN2 allows FPGA to gate LDO during idle periods while keeping buck ready for rapid wake-up. |
Use Scenario: Patch-style ECG monitor using ultra-low-power MCU and analog signal conditioning. IC Role / Device Role / Timing Role: Provides regulated 1.8 V (digital domain) and 2.5 V (analog front-end) from single Li-ion cell (2.7–4.2 V). Use Value: -40°C to +125°C rating ensures reliability across body-worn temperature extremes; PG asserts only after LDO stabilizes, preventing false starts. |
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-SI0EMF | Monitors both buck and LDO outputs with open-drain PG; identical pinout and electrical specs otherwise | Required where system reset must depend on stability of *both* rails (e.g., FPGA with separate core/I/O supplies) | Select TC1303C-SI0EMF if dual-rail PG assertion is mandatory; otherwise TC1303B-SI0EMF simplifies design with push-pull PG |
| TPS62231DRYR | Single-output 600 mA buck only; no integrated LDO or PG monitoring - requires external LDO and supervisor | Suitable when LDO rail is not required or can be added discretely; smaller solution size for single-rail needs | Choose TPS62231DRYR only if LDO functionality is unnecessary or can be implemented externally with minimal BOM impact |
Compared with TC1303C-SI0EMF, the TC1303B-SI0EMF offers simpler reset circuitry via push-pull PG but lacks dual-rail monitoring; versus TPS62231DRYR, it provides higher integration and lower system-level component count at the cost of fixed dual-rail topology.
Availability
TC1303B-SI0EMF is available at Aetrix Electronics and suitable for handheld medical instruments, USB-powered sensor hubs, and portable diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TC1303B-SI0EMF 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 family is designed for space- and power-constrained portable electronics, delivering highly integrated dual-rail power conversion with minimal external components and robust protection features for battery-operated systems.
FAQ
What output voltages does the TC1303B-SI0EMF provide?
The TC1303B-SI0EMF is a fixed-output variant delivering 1.8 V from its synchronous buck regulator (VOUT1) and 2.5 V from its low-dropout linear regulator (VOUT2), as indicated by the "SI0EMF" part number suffix per Microchip's ordering guide. Both outputs are factory-trimmed to ±0.3% tolerance over temperature and load.
How does the power-good (PG) function work on the TC1303B-SI0EMF?
The TC1303B-SI0EMF monitors only the LDO output (VOUT2) for power-good assertion, with a 94% threshold and 300 ms delay. Its PG pin is a push-pull output - unlike TC1303A/C/TC1304 - meaning it actively drives high when VOUT2 is in regulation and low when out-of-regulation, eliminating the need for an external pull-up resistor.
Can the TC1303B-SI0EMF operate from a single Li-ion cell?
Yes. The TC1303B-SI0EMF supports input voltages from 2.7 V to 5.5 V, matching the discharge curve of a standard Li-ion cell (2.7–4.2 V). Its 137 mV LDO dropout at 200 mA ensures the 2.5 V rail remains regulated down to ~2.64 V input, and its 280 mV buck dropout at 500 mA maintains 1.8 V output until ~2.08 V input.
What is the thermal performance of the TC1303B-SI0EMF in the 10-pin DFN package?
In the 10-pin 3×3 mm DFN package with exposed pad soldered to AGND, the TC1303B-SI0EMF has a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer board with internal ground plane and two thermal vias. This enables full 500 mA buck + 300 mA LDO load at ambient temperatures up to +85°C without forced airflow.
Does the TC1303B-SI0EMF require external compensation components?
No. Both the synchronous buck regulator and the LDO in the TC1303B-SI0EMF are internally compensated. The buck stage only requires an external 4.7 µH inductor and 4.7 µF input/output capacitors; the LDO requires just a single 1 µF ceramic capacitor on VOUT2 - no resistors, capacitors, or feedback networks are needed for stability.
TC1303B-SI0EMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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:
- 1.5V, 500mA
- Voltage/Current - Output 2:
- 2.5V, 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-SI0EMF FAQ
1.How can I place an order for TC1303B-SI0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-SI0EMF 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-SI0EMF reliable?
The price and inventory of TC1303B-SI0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-SI0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-SI0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-SI0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-SI0EMF?
TC1303B-SI0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-SI0EMF 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-SI0EMF?
For technical support, including TC1303B-SI0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-SI0EMF requirements.
6.How does Aetrix verify that TC1303B-SI0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-SI0EMF 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-SI0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-SI0EMF?
All TC1303B-SI0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-SI0EMF, 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-SI0EMF part is unused and in its original packaging.
Return procedure for TC1303B-SI0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TC1303B-SI0EMF 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…
