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Microchip Technology TC1303B-SD0EMF
- Part No.:
- TC1303B-SD0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-SD0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,984
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Product details
Overview
TC1303B-SD0EMF 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 on the LDO output. It delivers 1.8V at 500 mA (buck) and 3.3V at 300 mA (LDO), features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature. It is designed for portable USB-powered devices requiring sequenced, low-noise dual-rail supplies.
For engineers reviewing the TC1303B-SD0EMF datasheet, TC1303B-SD0EMF pinout, TC1303B-SD0EMF application, or TC1303B-SD0EMF equivalent, key selection criteria include LDO-monitored PG functionality, independent SHDN1/SHDN2 control, 137 mV typical dropout at 200 mA, DFN-10 package thermal resistance (41°C/W), and compatibility with ceramic output capacitors as small as 1 µF for the LDO.
Technical Context
The TC1303B-SD0EMF implements a synchronous buck stage with PFM/PWM auto-transition and internal compensation, paired with an independently controlled LDO featuring push-pull power-good output referenced solely to VOUT2. Its UVLO threshold is 2.55 V (typical) with 200 mV hysteresis, and thermal shutdown activates at 165°C with 10°C hysteresis.
Unlike TC1303A (PG monitors buck) or TC1303C/TC1304 (PG monitors both rails), the TC1303B variant exclusively ties PG assertion to LDO regulation - enabling precise reset timing for peripherals powered by VOUT2. The device supports adjustable (0.8–4.5 V) or fixed buck outputs and standard LDO voltages (1.5/1.8/2.5/3.3 V), with this specific part configured for 1.8 V buck and 3.3 V LDO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output | 1.8 V @ 500 mA, fixed; enables core voltage supply for low-power processors |
| LDO Output | 3.3 V @ 300 mA, fixed; powers I/O, USB PHY, or sensors with low noise |
| Power-Good Logic | Push-pull PG tied to VOUT2; asserts when LDO reaches 94% of 3.3 V (3.102 V) |
| Quiescent Current | 65 µA typical total IQ; minimizes battery drain in standby mode |
| Dropout Voltage | 137 mV typical @ 200 mA on LDO; allows operation down to VIN2 = 3.437 V |
| Switching Frequency | 2.0 MHz fixed (buck); enables use of compact 4.7 µH inductor and 4.7 µF output cap |
| Operating Temp | –40°C to +125°C junction; qualified for industrial and extended-temperature portable designs |
Pinout & Package
TC1303B-SD0EMF is housed in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP) connected to AGND. The package provides θJA = 41°C/W on a 4-layer board with internal ground plane and two vias under the EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown input | Active-high logic; >45% VIN enables LDO; <15% VIN disables it |
| 2 (VIN2) | LDO input supply | Accepts 2.7–5.5 V; must be short-traced to VIN1 to minimize noise coupling |
| 3 (VOUT2) | LDO regulated output | 3.3 V source; requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 (PG) | Power-good output | Push-pull, active-high; indicates VOUT2 ≥ 3.102 V with 300 ms delay |
| 5 (AGND) | Analog ground reference | Separate ground node for feedback and regulation circuitry; tie to analog ground plane |
| 6 (PGND) | Power ground return | High-current return path for buck switch; connect to power ground near LX |
| 7 (LX) | Buck switch node | Connects to external inductor; carries high di/dt; requires tight layout to PGND |
| 8 (VIN1) | Buck input supply | Accepts 2.7–5.5 V; shared with VIN2 in most applications |
| 9 (SHDN1) | Buck shutdown input | Active-high logic; independent control of buck stage; same voltage thresholds as SHDN2 |
| 10 (VFB1/VOUT1) | Buck feedback/sense | Fixed 1.8 V output: connect directly to VOUT1; no divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staggered enable/disable of buck and LDO for sequencing or fault isolation |
| LDO-monitored power-good | PG asserts only after VOUT2 stabilizes - critical for resetting peripherals powered by 3.3 V rail |
| Low-noise buck architecture | 2.0 MHz switching + automatic PWM-to-PFM transition reduces EMI and extends battery life at light loads |
| Internally compensated regulators | Eliminates need for external compensation components - reduces BOM count and layout complexity |
| Robust protection suite | Includes UVLO, overtemperature shutdown (165°C), and short-circuit protection on both outputs |
Applications
| USB-Powered Portable Instrument | Handheld Medical Sensor Module |
|---|---|
Use Scenario: Battery-operated glucose meter with microcontroller (1.8 V core) and analog front-end (3.3 V I/O). IC Role / Device Role / Timing Role: TC1303B-SD0EMF supplies dual rails and generates processor reset via PG tied to stable 3.3 V LDO output. Use Value: Ensures MCU does not execute until analog sensor bias is fully regulated, preventing measurement errors during power-up. | Use Scenario: Portable pulse oximeter using low-power MCU and optical sensor array. IC Role / Device Role / Timing Role: Provides 1.8 V for MCU sleep-mode operation and 3.3 V for LED drivers and ADC reference. Use Value: 65 µA quiescent current extends battery life; 137 mV LDO dropout enables operation down to 3.44 V battery voltage. |
| Industrial Handheld Terminal | Low-Power IoT Edge Node |
Use Scenario: Ruggedized barcode scanner with display backlight and wireless interface. IC Role / Device Role / Timing Role: Delivers clean 3.3 V for RF transceiver and 1.8 V for ARM Cortex-M0+ core. Use Value: 2.0 MHz buck switching avoids AM radio band interference; PG signal synchronizes firmware boot with RF readiness. | Use Scenario: Battery-powered environmental sensor node transmitting via BLE. IC Role / Device Role / Timing Role: Powers ultra-low-power MCU (1.8 V) and BLE SoC I/O (3.3 V) with independent shutdown control. Use Value: SHDN1/SHDN2 allow dynamic rail gating - disabling LDO during BLE transmit saves ~46 µA IQ while preserving buck readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16321-3302H/DC | Single 3.3 V buck-only regulator; no integrated LDO or PG monitoring | Requires external LDO and reset supervisor for dual-rail systems | Choose only if LDO rail is unnecessary or already provided externally |
| TPS65023BRSBR | Triple-output PMIC (2 buck + 1 LDO); 2.25 MHz switching; PG monitors buck1 only | Higher integration but lacks LDO-monitored PG; larger 4×4 QFN package | Prefer when system needs three rails and can accept buck-referenced reset timing |
Compared with MCP16321-3302H/DC and TPS65023BRSBR, TC1303B-SD0EMF uniquely combines LDO-monitored PG, independent shutdown, and DFN-10 footprint - making it optimal for space-constrained, dual-rail USB devices where LDO stability dictates system readiness.
Availability
TC1303B-SD0EMF is available at Aetrix Electronics and suitable for USB-powered portable instruments, handheld medical sensors, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for TC1303B-SD0EMF 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 devices, and power management ICs, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC1303 family was engineered to deliver cost-effective, space-efficient dual-rail power solutions for battery-powered portable electronics - emphasizing low IQ, thermal robustness, and flexible output configuration without external compensation.
FAQ
What output voltages does the TC1303B-SD0EMF provide?
The TC1303B-SD0EMF provides a fixed 1.8 V output from its synchronous buck regulator (VOUT1) and a fixed 3.3 V output from its low-dropout linear regulator (VOUT2). These values are factory-configured and do not require external feedback resistors. The part number suffix "SD0EMF" explicitly denotes this 1.8 V / 3.3 V combination in the DFN-10 package.
How does the power-good (PG) function work on the TC1303B-SD0EMF?
The TC1303B-SD0EMF features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value (≥3.102 V for 3.3 V), with a built-in 300 ms delay to ensure stable regulation before signaling system readiness. This differs from TC1303A (PG monitors buck) and TC1303C/TC1304 (PG monitors both rails).
Can the TC1303B-SD0EMF operate from a single 3.6 V Li-ion battery?
Yes, the TC1303B-SD0EMF supports input voltages from 2.7 V to 5.5 V on both VIN1 and VIN2. With a nominal 3.6 V Li-ion battery, it delivers 1.8 V @ 500 mA and 3.3 V @ 300 mA efficiently. Its 137 mV typical LDO dropout ensures VOUT2 remains regulated down to VIN2 = 3.437 V, covering most of the battery discharge curve.
What is the thermal performance of the TC1303B-SD0EMF in its DFN package?
The TC1303B-SD0EMF in the 3×3 mm DFN package 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 exposed pad. This enables full 500 mA buck + 300 mA LDO load capability at +85°C ambient, with thermal shutdown activating at 165°C junction temperature.
Does the TC1303B-SD0EMF require external compensation components?
No, the TC1303B-SD0EMF uses internally compensated control loops for both the buck regulator and LDO. This eliminates the need for external compensation capacitors or resistors, reducing bill-of-materials cost and PCB area - a key advantage over many competing dual-output regulators that require careful loop compensation design.
TC1303B-SD0EMF 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:
- 3V, 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-SD0EMF FAQ
1.How can I place an order for TC1303B-SD0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-SD0EMF 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-SD0EMF reliable?
The price and inventory of TC1303B-SD0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-SD0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-SD0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-SD0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-SD0EMF?
TC1303B-SD0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-SD0EMF 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-SD0EMF?
For technical support, including TC1303B-SD0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-SD0EMF requirements.
6.How does Aetrix verify that TC1303B-SD0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-SD0EMF 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-SD0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-SD0EMF?
All TC1303B-SD0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-SD0EMF, 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-SD0EMF part is unused and in its original packaging.
Return procedure for TC1303B-SD0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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