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Microchip Technology MCP1603BT-180I/OS
- Part No.:
- MCP1603BT-180I/OS
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MCP1603BT-180I/OS.pdf
- Description:
- IC REG BUCK 1.8V 500MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MCP1603BT-180I/OS from Microchip Technology is a fixed-output 1.8 V, 500 mA synchronous buck DC-DC regulator optimized for single-cell Li-Ion and multi-cell NiMH/NiCd battery-powered portable electronics. It operates from 2.7 V to 5.5 V input, delivers >90% typical efficiency at full load, features 2.0 MHz PWM-only switching, and integrates P- and N-channel MOSFETs in an 8-pin 2×3 DFN package with exposed thermal pad.
For engineers reviewing the MCP1603BT-180I/OS datasheet, MCP1603BT-180I/OS pinout, MCP1603BT-180I/OS application, or MCP1603BT-180I/OS equivalent, key selection criteria include its PWM-only operation (no PFM ripple), 1.8 V fixed output, 0.1 µA shutdown current, thermal shutdown at 150°C, and compatibility with compact 4.7 µH inductor + 4.7 µF ceramic capacitor designs.
Technical Context
The MCP1603BT-180I/OS is the PWM-only variant of the MCP1603/B/L family - it disables automatic PFM mode transition and maintains constant 2.0 MHz switching across all load conditions, eliminating low-frequency output ripple. This makes it suitable for noise-sensitive analog or RF subsystems where PFM-induced spectral content is unacceptable.
It uses internal current-mode control with cycle-by-cycle peak current limiting (860 mA typical), integrated 0.8 V reference feedback, undervoltage lockout (2.28 V typical, 140 mV hysteresis), and overtemperature protection with 10°C hysteresis. The device requires no external compensation when used in fixed-output configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% over –40°C to +85°C; eliminates need for external resistor divider. |
| Max Output Current | 500 mA continuous; supports power rails for microcontrollers, sensors, and USB peripherals. |
| Input Voltage Range | 2.7 V to 5.5 V; compatible with 1-cell Li-Ion (2.7–4.2 V) and 3-cell NiMH (3.6–4.5 V) sources. |
| Switching Frequency | 2.0 MHz typical; enables use of small 4.7 µH inductors and 4.7 µF ceramic capacitors. |
| Shutdown Current | 0.1 µA typical; extends battery life in standby or sleep modes. |
| Quiescent Current | 2.7 mA typical in PWM mode; stable under light-load conditions without pulse skipping. |
| Thermal Shutdown | 150°C junction temperature threshold with 10°C hysteresis; protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Package: 8-lead 2×3 mm DFN with exposed thermal pad (EP), rated θJA = 68°C/W on 4-layer board with 2 vias to internal ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Enable/disable logic input | Active-high control; requires >45% VIN to enable; <15% VIN to disable; leakage ±0.1 µA. |
| 2 (NC) | No connect | Not internally bonded; must be left floating or tied to GND per layout best practice. |
| 3 (VFB/VOUT) | Output voltage sense / feedback | Direct connection to regulated 1.8 V output; 0.1 nA bias current enables high-impedance stability. |
| 4 (VIN) | Main power input | Accepts 2.7–5.5 V; requires local 4.7 µF ceramic decoupling to GND. |
| 5 (NC) | No connect | Not internally bonded; must be left floating or tied to GND. |
| 6 (NC) | No connect | Not internally bonded; must be left floating or tied to GND. |
| 7 (GND) | Power and signal ground | Primary return path; connects to exposed thermal pad (EP) for heat dissipation. |
| 8 (LX) | Switch node | Drives external 4.7 µH buck inductor; carries high di/dt; requires shortest possible trace to minimize EMI. |
| EP | Exposed thermal pad | Electrically GND; must be soldered to PCB ground plane with ≥2 thermal vias for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| PWM-only operation | Eliminates PFM pulse-skipping ripple; ensures consistent 2.0 MHz switching spectrum for EMC-constrained designs. |
| Internally compensated | Zero external compensation components required for fixed 1.8 V output; reduces BOM count and layout area. |
| 100% duty cycle capability | Supports ultra-low dropout operation when VIN approaches VOUT; maintains regulation down to VIN = VOUT + headroom. |
| Integrated MOSFETs | P- and N-channel synchronous switches with 500 mΩ RDS(on) each; eliminates need for external diode or second FET. |
| Robust protection suite | UVLO (2.28 V), overtemperature (150°C), and cycle-by-cycle current limit (860 mA) ensure safe operation under fault conditions. |
Applications
| Portable Medical Sensors | USB-Powered Peripherals |
|---|---|
Use Scenario: Compact wearable glucose monitors powered by coin-cell or Li-Poly batteries requiring stable 1.8 V for low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, ripple-controlled 1.8 V rail with minimal quiescent draw during sensor sampling intervals. Use Value: PWM-only operation prevents PFM-induced noise coupling into sensitive analog measurement paths, preserving ADC accuracy. | Use Scenario: Bus-powered USB audio interfaces needing regulated 1.8 V for digital audio processors and I²S transceivers. IC Role / Device Role / Timing Role: Input-to-rail converter accepting 4.75–5.25 V USB VBUS and generating tightly regulated 1.8 V with fast transient response. Use Value: 2.0 MHz switching allows use of miniature passive components while maintaining low output ripple (<15 mV) critical for jitter-sensitive clock domains. |
| Industrial Handheld Terminals | Low-Power IoT Edge Nodes |
Use Scenario: Ruggedized barcode scanners using 3-cell NiMH packs (3.6–4.5 V) powering ARM Cortex-M MCUs and CMOS image sensors. IC Role / Device Role / Timing Role: Main power supply IC providing 500 mA 1.8 V rail for core logic and memory interface under varying load profiles. Use Value: 0.1 µA shutdown current extends operational runtime between charges; thermal shutdown prevents latch-up during extended scanning sessions. | Use Scenario: Battery-operated environmental sensor nodes transmitting via BLE or LoRa, requiring ultra-low standby power and reliable wake-up sequencing. IC Role / Device Role / Timing Role: Always-on power manager supplying 1.8 V to ultra-low-power MCU and RF transceiver in deep-sleep and active transmit states. Use Value: Fixed 1.8 V output with ±2.5% tolerance ensures consistent timing margins for crystal oscillators and RF synthesizers across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.8 V fixed, 500 mA, 3.6 MHz PWM-only, 2.05–6.0 V input, 1.5 µA quiescent current | Higher switching frequency enables smaller passives but increases EMI risk; lacks thermal shutdown hysteresis | Select when board space is constrained and higher-frequency filtering is acceptable; verify thermal margin with θJA = 120°C/W. |
| RT8059HGJ6F | 1.8 V fixed, 600 mA, 1.5 MHz PWM-only, 2.5–5.5 V input, 0.3 µA shutdown current | Lower switching frequency improves EMI profile but requires larger inductor (6.8 µH); no UVLO hysteresis spec | Select when lower radiated emissions are prioritized over minimum footprint; confirm UVLO behavior matches system brown-out requirements. |
Compared with TPS62231DRYR and RT8059HGJ6F, the MCP1603BT-180I/OS offers superior thermal protection (150°C shutdown with 10°C hysteresis), tighter output tolerance (±2.5% vs. ±3%), and lower shutdown current (0.1 µA), making it optimal for thermally isolated or long-duration battery applications where reliability trumps raw size reduction.
Availability
MCP1603BT-180I/OS is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered peripherals, and industrial handheld terminals requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MCP1603BT-180I/OS 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 Inc. 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 MCP1603/B/L product line was designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, low-noise, fixed- or adjustable-output DC-DC conversion with minimal external components.
FAQ
What is the minimum load requirement for regulation of the MCP1603BT-180I/OS?
The MCP1603BT-180I/OS requires a minimum load current to maintain regulation due to its PWM-only architecture. As shown in Figure 2-15 of DS22042B, the minimum load depends on input-to-output voltage ratio - for example, at VIN = 3.6 V and VOUT = 1.8 V, regulation is maintained down to ~5 mA. Below this, output voltage rises above 1.8 V. This behavior is inherent to constant-frequency operation without pulse skipping.
Does the MCP1603BT-180I/OS require external compensation components?
No, the MCP1603BT-180I/OS does not require external compensation components when used in fixed-output configuration. Its internal error amplifier and compensation network are fully optimized for the 1.8 V output option. External RC compensation is only needed for adjustable-output variants, as specified in Section 5.3 of DS22042B.
What is the thermal performance of the MCP1603BT-180I/OS in its DFN package?
The MCP1603BT-180I/OS in the 8-lead 2×3 mm DFN package has a typical junction-to-ambient thermal resistance (θJA) of 68°C/W when mounted on a 4-layer PCB with internal ground plane and two thermal vias connecting the exposed pad to the ground plane. This enables continuous 500 mA operation at ambient temperatures up to +85°C with proper layout.
Can the MCP1603BT-180I/OS be used with ceramic output capacitors?
Yes, the MCP1603BT-180I/OS is fully compatible with low-ESR ceramic output capacitors. The datasheet specifies 4.7 µF X5R or X7R ceramics as standard, and recommends values up to 22 µF. Ceramic capacitors provide optimal transient response and low ripple - critical for noise-sensitive applications like audio or RF subsystems powered by the MCP1603BT-180I/OS.
How does the SHDN pin interface with common microcontroller GPIOs?
The SHDN pin of the MCP1603BT-180I/OS is a CMOS-compatible logic input: it asserts enable when pulled above 45% of VIN (e.g., >1.26 V for VIN = 2.8 V) and disables the regulator when pulled below 15% of VIN (e.g., <0.42 V). Most 1.8 V or 3.3 V GPIOs can directly drive it, provided the microcontroller's output high level exceeds the required threshold at the lowest expected VIN.
MCP1603BT-180I/OS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MCP1603BT-180I/OS FAQ
1.How can I place an order for MCP1603BT-180I/OS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP1603BT-180I/OS 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 MCP1603BT-180I/OS reliable?
The price and inventory of MCP1603BT-180I/OS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP1603BT-180I/OS is usually 5 days.
3.What payment methods are accepted for MCP1603BT-180I/OS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP1603BT-180I/OS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP1603BT-180I/OS?
MCP1603BT-180I/OS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP1603BT-180I/OS 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 MCP1603BT-180I/OS?
For technical support, including MCP1603BT-180I/OS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP1603BT-180I/OS requirements.
6.How does Aetrix verify that MCP1603BT-180I/OS is sourced from the original manufacturer or authorized distributors?
All MCP1603BT-180I/OS 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 MCP1603BT-180I/OS meets industry standards.
7.What is the process for return or replacement of MCP1603BT-180I/OS?
All MCP1603BT-180I/OS units undergo pre-shipment inspection (PSI). If there is an issue with MCP1603BT-180I/OS, 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 MCP1603BT-180I/OS part is unused and in its original packaging.
Return procedure for MCP1603BT-180I/OS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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