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Microchip Technology TC1303B-SH0EMF
- Part No.:
- TC1303B-SH0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-SH0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,061
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Product details
Overview
TC1303B-SH0EMF 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 tied to the LDO output. It delivers 1.8V/500 mA and 3.3V/300 mA outputs, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature - used in portable medical instruments and USB-powered devices requiring sequenced dual-rail supplies.
For engineers reviewing the TC1303B-SH0EMF datasheet, TC1303B-SH0EMF pinout, TC1303B-SH0EMF application, or TC1303B-SH0EMF equivalent, this page provides verified functional identity, validated pin roles, confirmed LDO-monitored PG behavior, exact package mapping (10-pin DFN 3×3 mm), and two field-validated alternative parts for dual-output PMIC selection in battery-powered embedded systems.
Technical Context
The TC1303B-SH0EMF implements independent shutdown control for buck (SHDN1) and LDO (SHDN2) sections, enabling flexible power sequencing. Its buck regulator transitions automatically between PWM (heavy load) and PFM (light load) modes without external intervention, maintaining >90% efficiency at 500 mA while minimizing no-load IQ.
The LDO section uses internal compensation and achieves 137 mV typical dropout at 200 mA, monitored by a push-pull PG output referenced solely to VOUT2 with 94% regulation threshold and 300 ms delay - distinct from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored or sequenced).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA max - supports core voltage rails for ARM Cortex-M microcontrollers or FPGA I/O banks |
| LDO Output Current | 300 mA max - powers analog sensors, RF front-ends, or USB PHY circuitry with low noise |
| Quiescent Current | 65 µA typical - enables multi-week battery life in always-on wearable medical monitors |
| PG Monitoring Target | LDO output only (VOUT2) - ensures system reset is asserted only when auxiliary rail is stable |
| Switching Frequency | 2.0 MHz fixed (±0.4 MHz) - allows use of compact 4.7 µH inductors and reduces EMI filtering burden |
| Operating Temperature | –40°C to +125°C junction - qualified for under-hood automotive accessory modules and industrial handhelds |
| Dropout Voltage (LDO) | 137 mV typical @ 200 mA - sustains 3.3V output down to 3.437V input, critical for Li-ion battery discharge tail |
Pinout & Package
TC1303B-SH0EMF is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. The package supports high-power-density layouts and achieves θJA = 41°C/W on 4-layer PCBs with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN2 | LDO shutdown input | Active-high logic input (>45% VIN); enables/disables LDO independently of buck stage |
| 2 - VIN2 | LDO input supply | Accepts 2.7–5.5V; must be short-traced to VIN1 to minimize noise coupling into LDO path |
| 3 - VOUT2 | LDO regulated output | Delivers fixed 3.3V (per SH0EMF suffix); requires ≥1 µF ceramic capacitor to AGND |
| 4 - PG | Power-good indicator | Push-pull output asserting high when VOUT2 reaches 94% of 3.3V; 300 ms delay enables processor reset timing |
| 5 - AGND | Analog ground reference | Single-point connection for feedback resistors, VFB, and output capacitors; isolated from PGND |
| 6 - PGND | Power ground return | High-current return path for buck switch node (LX); must be routed separately from AGND |
| 7 - LX | Buck switch node | Connects to external 4.7 µH inductor; switching waveform has fast edges requiring tight layout |
| 8 - VIN1 | Buck input supply | Accepts 2.7–5.5V; shares input source with VIN2 but requires local 4.7 µF decoupling |
| 9 - SHDN1 | Buck shutdown input | Active-high logic input (>45% VIN); controls buck stage independently for dynamic power gating |
| 10 - VFB1/VOUT1 | Buck feedback/sense | Configured as VOUT1 for fixed-output variants; SH0EMF delivers 1.8V, so pin connects directly to output |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck/LDO shutdown | Enables staggered power-up of digital core (buck) before analog peripherals (LDO), reducing inrush current |
| PFM/PWM auto-transition | Maintains >85% efficiency at 1 mA load without external mode-control signals or firmware overhead |
| LDO-monitored push-pull PG | Eliminates need for external pull-up resistor and level-shifter when interfacing with 3.3V microcontroller reset inputs |
| Internal compensation | Reduces BOM count by removing external compensation networks - only input/output capacitors required |
| Thermal/UVLO/short-circuit protection | Prevents field failures in unattended portable equipment; latches off until VIN drops below 2.4V UVLO threshold |
Applications
| Portable Medical Instrumentation | USB-Powered Test Equipment |
|---|---|
|
Use Scenario: Handheld ECG monitor powered via USB-C with dual-rail sensor front-end and MCU core. IC Role / Device Role / Timing Role: TC1303B-SH0EMF supplies 1.8V to ADC/DAC and 3.3V to op-amps and USB transceiver, with PG asserting reset only after analog rail stabilizes. Use Value: 137 mV LDO dropout extends usable battery time by 12% during Li-ion discharge from 3.6V to 3.4V. |
Use Scenario: Field-deployable oscilloscope probe with integrated signal conditioning and USB 2.0 interface. IC Role / Device Role / Timing Role: Delivers clean 3.3V to USB PHY and 1.8V to precision amplifier chain; PG delay synchronizes MCU boot with analog subsystem readiness. Use Value: 2.0 MHz switching frequency enables <12 mm² total passive area (inductor + caps), meeting handheld form factor constraints. |
| Industrial Handheld Terminal | Low-Power IoT Sensor Node |
|
Use Scenario: Ruggedized barcode scanner operating from single-cell Li-ion with display backlight and imager. IC Role / Device Role / Timing Role: Powers 3.3V imager interface and 1.8V SoC core; independent SHDN1/SHDN2 allows deep-sleep mode where only RTC remains active. Use Value: 65 µA total IQ extends standby time to >18 months on 500 mAh battery, per IEC 62368-1 energy budgeting. |
Use Scenario: Battery-operated environmental sensor transmitting data over BLE every 5 minutes. IC Role / Device Role / Timing Role: Generates 1.8V for ultra-low-power MCU and 3.3V for RF transceiver; PG signal triggers wake-up only when both rails are valid. Use Value: LDO-monitored PG prevents false wake-ups caused by buck ripple during light-load PFM operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1826S-3302E/DB | Single 3.3V LDO only (no buck stage); 300 mA output; no PG or shutdown control | Requires external buck converter for 1.8V rail; lacks power sequencing and fault monitoring | Use only if existing design already includes discrete buck regulator and needs LDO-only upgrade path |
| TPS65023RSBR | Triple-output (2 buck + 1 LDO); 2.0 MHz switching; PG monitors buck1 only; 10-pin QFN | Supports more complex SoC power trees but lacks LDO-specific PG - unsuitable where auxiliary rail stability is primary reset condition | Select when powering OMAP or DaVinci processors needing three rails; avoid when LDO-monitored reset is mandatory |
Compared with MCP1826S-3302E/DB and TPS65023RSBR, TC1303B-SH0EMF uniquely combines LDO-monitored push-pull PG, independent shutdown, and integrated buck+LDO in a 3×3 mm DFN - making it the only option that satisfies strict reset timing dependencies on auxiliary rail stability in space-constrained portable designs.
Availability
TC1303B-SH0EMF is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with guaranteed long-term manufacturability and full traceability.
Supply support for TC1303B-SH0EMF 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 vertically integrated silicon and software tools.
The TC1303 family was designed specifically for space- and power-constrained portable electronics needing tightly regulated dual-rail supplies with minimal external components and robust fault monitoring - targeting battery-powered medical, test, and industrial handheld applications.
FAQ
What output voltages does the TC1303B-SH0EMF provide?
The TC1303B-SH0EMF delivers a fixed 1.8V output from its synchronous buck regulator (VOUT1) and a fixed 3.3V output from its low-dropout linear regulator (VOUT2), as indicated by the "SH0" and "EMF" suffixes in the part number. Both outputs are internally compensated and require no external feedback resistors.
How does the power-good (PG) function operate in the TC1303B-SH0EMF?
In the TC1303B-SH0EMF, the PG pin is a push-pull output that asserts high only when VOUT2 (the 3.3V LDO output) reaches and maintains ≥94% of its nominal value, with a built-in 300 ms delay. This behavior is specific to the TC1303B variant and differs from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored or sequenced).
What package type is used for the TC1303B-SH0EMF?
The TC1303B-SH0EMF is supplied in a 10-pin 3×3 mm DFN package with an exposed thermal pad (EP), designated as "EMF" in Microchip's packaging nomenclature. The EP must be soldered to AGND for thermal performance and electrical integrity, achieving θJA = 41°C/W on standard 4-layer PCBs.
Can the TC1303B-SH0EMF support independent enable/disable of its two regulators?
Yes - the TC1303B-SH0EMF provides separate shutdown inputs: SHDN1 controls the buck regulator (VOUT1), and SHDN2 controls the LDO (VOUT2). Each accepts active-high logic (≥45% VIN) and draws <1 µA leakage, enabling precise power sequencing and ultra-low-power sleep states where only one rail remains active.
What is the typical quiescent current of the TC1303B-SH0EMF under full operation?
The TC1303B-SH0EMF exhibits a typical total device quiescent current of 65 µA when both regulators are enabled and unloaded (IOUT1 = IOUT2 = 0 mA), measured at TA = +25°C with VIN = 3.6V. This value remains stable across –40°C to +85°C ambient, supporting multi-year battery life in always-on portable applications.
TC1303B-SH0EMF 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:
- 2.6V, 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-SH0EMF FAQ
1.How can I place an order for TC1303B-SH0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-SH0EMF 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-SH0EMF reliable?
The price and inventory of TC1303B-SH0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-SH0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-SH0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-SH0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-SH0EMF?
TC1303B-SH0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-SH0EMF 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-SH0EMF?
For technical support, including TC1303B-SH0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-SH0EMF requirements.
6.How does Aetrix verify that TC1303B-SH0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-SH0EMF 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-SH0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-SH0EMF?
All TC1303B-SH0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-SH0EMF, 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-SH0EMF part is unused and in its original packaging.
Return procedure for TC1303B-SH0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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