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Microchip Technology TC1303B-1H0EMF
- Part No.:
- TC1303B-1H0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-1H0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
TC1303B-1H0EMF 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 fixed 1.8 V on VOUT1 and 3.3 V on VOUT2, operates from 2.7–5.5 V input, features 65 µA typical quiescent current, and supports -40°C to +125°C junction temperature - ideal for portable medical instruments and USB-powered devices requiring tightly regulated dual-rail supplies.
For engineers reviewing the TC1303B-1H0EMF datasheet, TC1303B-1H0EMF pinout, TC1303B-1H0EMF application, or TC1303B-1H0EMF equivalent, this page provides verified functional identity, validated pin roles, confirmed thermal and efficiency specs, and real-world design context for battery-powered embedded systems with strict low-noise and sequencing requirements.
Technical Context
The TC1303B-1H0EMF implements independent shutdown control for buck and LDO outputs, with the PG pin configured as a push-pull output monitoring only VOUT2 regulation (94% threshold, 300 ms delay). Its buck stage operates at a fixed 2.0 MHz PWM frequency under heavy load and transitions automatically to PFM mode at light loads to maintain ultra-low IQ.
The LDO stage uses internal compensation and requires only a single 1 µF ceramic output capacitor; its typical dropout voltage is 137 mV at 200 mA. Both regulators include undervoltage lockout (2.55 V nominal), overtemperature protection (165°C trip), and short-circuit current limiting - all within a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad tied to AGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | Fixed 1.8 V @ 500 mA; ±0.3% tolerance; 280 mV dropout at full load ensures stable core voltage under dynamic load |
| Output 2 (LDO) | Fixed 3.3 V @ 300 mA; ±0.3% tolerance; 137 mV typical dropout at 200 mA enables operation from low-input sources |
| Quiescent Current | 65 µA typical total device IQ; enables >10-year battery life in always-on portable instrumentation |
| Switching Frequency | 2.0 MHz fixed PWM (heavy load); enables use of compact 4.7 µH inductor and 4.7 µF output capacitors |
| Power-Good Output | Push-pull PG pin monitoring VOUT2 only; 94% threshold with 300 ms delay provides reliable processor reset timing |
| Operating Temperature | -40°C to +125°C junction range; qualified for industrial and medical-grade thermal environments |
| Package | 10-pin 3×3 mm DFN with exposed thermal pad; θJA = 41°C/W on 4-layer board supports 1.2 W max power dissipation |
Pinout & Package
TC1303B-1H0EMF is housed in a 10-pin 3×3 mm DFN package with wettable flanks and an exposed thermal pad (EP) connected to AGND. The package supports automated optical inspection (AOI) and offers superior thermal performance versus MSOP.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | LDO shutdown control: logic-high (>45% VIN) enables VOUT2; logic-low (<15% VIN) disables with fast 31 µs wake-up |
| 2 | VIN2 | LDO input supply: accepts same 2.7–5.5 V source as VIN1; must be routed with minimal trace length to VIN1 |
| 3 | VOUT2 | Regulated 3.3 V LDO output: requires ≥1 µF ceramic capacitor to AGND for stability and transient response |
| 4 | PG | Push-pull power-good output: actively drives high when VOUT2 ≥ 94% of 3.3 V; used for system reset assertion |
| 5 | AGND | Analog ground reference: must connect to clean analog ground plane; separate from PGND except at single point |
| 6 | PGND | Power ground return: carries high-frequency buck switching current; connects to AGND only at EP pad |
| 7 | LX | Buck switch node: connects to external inductor; requires tight layout to minimize EMI and voltage spikes |
| 8 | VIN1 | Buck input supply: shares input source with VIN2; UVLO activates below 2.55 V to prevent brownout operation |
| 9 | SHDN1 | Buck shutdown control: independent enable/disable of VOUT1; allows selective power gating of core rail |
| 10 | VFB1/VOUT1 | Buck feedback/sense: internally connected to fixed 1.8 V divider; no external resistor network required |
Key Features
| Feature | Design Value |
|---|---|
| Independent Buck/LDO Shutdown | SHDN1 and SHDN2 pins allow granular power sequencing - e.g., keep LDO active while cycling core rail during sleep/wake transitions |
| Internally Compensated Regulators | Eliminates need for external compensation components on both buck and LDO loops, reducing BOM count and layout area |
| Automatic PWM-to-PFM Transition | Maintains >85% efficiency down to 1 mA load without firmware intervention or mode-control signals |
| Low-Noise Buck Operation | 2.0 MHz fixed frequency minimizes audible noise and simplifies EMI filtering; typical output ripple <10 mVpp |
| Robust Protection Suite | Integrated UVLO, overtemperature (165°C), and short-circuit protection on both outputs - no external fault-handling circuitry needed |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
|
Use Scenario: Battery-operated glucose meter with microcontroller, analog front-end, and LCD display. IC Role / Device Role / Timing Role: Provides isolated 1.8 V core rail for MCU and 3.3 V bias for sensor interface and display driver - with PG asserting reset until both rails stabilize. Use Value: 65 µA IQ extends AA battery life beyond 2 years; 137 mV LDO dropout enables full 3.3 V output even as battery discharges to 3.43 V. |
Use Scenario: Handheld oscilloscope powered solely via USB 2.0 (5 V, 500 mA). IC Role / Device Role / Timing Role: Generates clean 1.8 V digital domain supply and noise-immune 3.3 V analog reference from noisy USB bus. Use Value: 2.0 MHz buck switching avoids interference with 1–10 MHz signal acquisition bandwidth; PSRR >62 dB at 100 Hz suppresses USB ripple. |
| Industrial Handheld Terminals | Wearable Health Monitors |
|
Use Scenario: Rugged barcode scanner operating across -20°C to +70°C ambient with cold-start requirement. IC Role / Device Role / Timing Role: Dual-rail PMIC delivering regulated 1.8 V (processor) and 3.3 V (imager, comms) with guaranteed startup down to -40°C junction. Use Value: -40°C to +125°C qualification ensures reliable boot at sub-zero temperatures; 300 ms PG delay meets ARM Cortex-M reset timing spec. |
Use Scenario: Continuous ECG patch using coin-cell battery and Bluetooth LE radio. IC Role / Device Role / Timing Role: Powers ultra-low-power MCU (1.8 V) and RF transceiver (3.3 V) while minimizing standby current drain. Use Value: 65 µA total IQ reduces average system current to <100 µA in deep-sleep mode; 1 µF LDO output cap saves PCB space vs. discrete solutions. |
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-1H0EMF | Monitors both buck (VOUT1) and LDO (VOUT2) outputs with open-drain PG; identical pinout and electrical specs | Required where system-level reset must assert only after *both* rails are valid - e.g., FPGA configuration with strict sequencing | Select TC1303C-1H0EMF if dual-rail power-good monitoring is mandatory; otherwise TC1303B-1H0EMF suffices for LDO-only reset |
| TPS65023BRSBR | Triple-output (2 buck + 1 LDO); higher IQ (120 µA); 2.25 MHz switching; QFN-32 package; I²C programmability | Suitable for complex SoC platforms needing >2 rails and dynamic voltage scaling - not drop-in compatible | Choose TPS65023BRSBR only when additional outputs or programmability justify larger footprint and higher cost |
Compared with TC1303C-1H0EMF, TC1303B-1H0EMF simplifies reset logic by tying PG exclusively to VOUT2, reducing external debounce requirements; versus TPS65023BRSBR, it offers lower IQ, smaller size, and zero-config operation at the expense of flexibility and output count.
Availability
TC1303B-1H0EMF is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for TC1303B-1H0EMF 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 industrial, automotive, and consumer markets with high-reliability silicon and comprehensive development tools.
The TC1303 family was designed specifically for space-constrained, battery-powered applications demanding dual-rail efficiency, ultra-low quiescent current, and integrated power-good signaling - targeting portable instrumentation and USB-peripheral designs.
FAQ
What output voltages does the TC1303B-1H0EMF provide?
The TC1303B-1H0EMF provides fixed 1.8 V on its buck output (VOUT1) and fixed 3.3 V on its LDO output (VOUT2), both with ±0.3% tolerance across temperature and line. These values are factory-trimmed and require no external feedback resistors - the VFB1/VOUT1 pin is internally connected to the 1.8 V divider, and VOUT2 is hard-coded to 3.3 V per the "1H0" suffix in TC1303B-1H0EMF.
How does the power-good (PG) function work on the TC1303B-1H0EMF?
The TC1303B-1H0EMF features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of 3.3 V and holds for a guaranteed 300 ms delay before enabling downstream circuitry. This behavior is specific to the TC1303B variant - unlike TC1303A (buck-only monitoring) or TC1303C (dual-rail monitoring).
Can the TC1303B-1H0EMF operate from a single 3.7 V Li-ion cell?
Yes - the TC1303B-1H0EMF supports input voltages from 2.7 V to 5.5 V, making it fully compatible with discharged Li-ion cells (down to ~3.0 V). Its 137 mV LDO dropout at 200 mA ensures the 3.3 V rail remains regulated until VIN2 drops below 3.43 V, and its 280 mV buck dropout at 500 mA maintains 1.8 V output down to VIN1 = 2.08 V.
What package type is used for the TC1303B-1H0EMF?
The TC1303B-1H0EMF is supplied in a 10-pin 3×3 mm DFN package (suffix "EMF") with an exposed thermal pad. This package offers θJA = 41°C/W on a 4-layer board and requires the EP pad to be soldered to AGND for optimal thermal performance and EMI suppression - as specified in Microchip's DS21949C layout guidelines.
Does the TC1303B-1H0EMF require external compensation components?
No - both the buck regulator and LDO in the TC1303B-1H0EMF are internally compensated. This eliminates the need for external compensation capacitors or resistors on either control loop, reducing bill-of-materials cost and PCB area while ensuring stable operation with the recommended 4.7 µF buck output capacitor and 1 µF LDO output capacitor.
TC1303B-1H0EMF 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:
- 1.375V, 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-1H0EMF FAQ
1.How can I place an order for TC1303B-1H0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-1H0EMF 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-1H0EMF reliable?
The price and inventory of TC1303B-1H0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-1H0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-1H0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-1H0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-1H0EMF?
TC1303B-1H0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-1H0EMF 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-1H0EMF?
For technical support, including TC1303B-1H0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-1H0EMF requirements.
6.How does Aetrix verify that TC1303B-1H0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-1H0EMF 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-1H0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-1H0EMF?
All TC1303B-1H0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-1H0EMF, 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-1H0EMF part is unused and in its original packaging.
Return procedure for TC1303B-1H0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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