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Nisshinbo Micro Devices Inc. RP605K203B-TR
- Part No.:
- RP605K203B-TR
- Manufacturer:
- Nisshinbo Micro Devices Inc.
- Category:
- Unclassified
- Package:
- Description:
- RP605K203B-TR
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Inventory:4,092
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Product details
Overview
RP605K203B-TR from Ricoh Electronics is an ultra-low-power buck-boost DC/DC converter with integrated battery monitor (VIN/3 division), delivering 300 mA output at fixed 2.0 V with ±1.5% accuracy, 0.3 µA quiescent current, and wide 1.8–5.5 V input range-designed for coin-cell-powered wearable health monitors requiring long runtime and precise battery state estimation.
For engineers reviewing the RP605K203B-TR datasheet, RP605K203B-TR pinout, RP605K203B-TR application, or RP605K203B-TR equivalent, key selection criteria include its dual-function integration (DC/DC + BM), auto-discharge capability (enabled by 'B' suffix), DFN(PL)2730-12 package thermal performance (θja = 32°C/W), and compatibility with low-noise ADC sampling via CE2-controlled BM activation.
Technical Context
The RP605K203B-TR implements a synchronous buck-boost topology with VFM (Variable Frequency Modulation) mode for high light-load efficiency, featuring independent enable control for DC/DC (CE1) and battery monitor (CE2), plus built-in UVLO (1.55 V release), OVP (6.0 V detection), and thermal shutdown (140°C trip).
Its battery monitor provides a buffered, low-impedance VIN/3 output (±30 mV tolerance) with only 0.1 µA supply current, enabling direct connection to MCU ADC inputs while minimizing system-level power overhead during periodic battery voltage sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0 V (±1.5% accuracy over −40°C to +85°C) |
| Max Output Current | 300 mA continuous-supports sensor clusters and BLE SoCs in compact wearables |
| Quiescent Current | 0.3 µA typ.-enables multi-year operation on CR2032 coin cells |
| Input Voltage Range | 1.8 V to 5.5 V-covers single Li-ion, two alkaline, or USB-powered operation |
| Battery Monitor Ratio | VIN/3 (confirmed by '3' in part number)-delivers 1.2 V output at 3.6 V battery for 12-bit ADC full-scale use |
| Auto-discharge Function | Enabled ('B' suffix)-discharges output capacitor via 100 Ω internal NMOS when CE1 deasserted, preventing residual voltage hold-up |
| Operating Temperature | −40°C to +85°C-validated for industrial-grade wearable and medical edge devices |
Pinout & Package
RP605K203B-TR uses the DFN(PL)2730-12 package (3.00 × 2.70 × 0.6 mm), with exposed thermal pad (GND-connected substrate) for enhanced heat dissipation. Pin numbering follows standard top-view layout (1–12, left-to-right, top row then bottom row).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AVIN | Analog Power Supply | Provides clean bias for internal reference and BM circuitry; decouple with 0.1 µF near pin |
| 2 CE1 | DC/DC Enable (Active-High) | Controls main converter operation; logic-high >1.0 V activates; open-circuit causes undefined behavior |
| 3 AGND | Analog Ground | Separate ground return for precision BM and feedback paths; tie to PGND at single point |
| 4 CE2 | Battery Monitor Enable (Active-High) | Activates VIN/3 output only during ADC sampling windows-reduces average BM current to sub-µA levels |
| 5 BM | Battery Monitor Output | Buffered VIN/3 voltage; requires ≥10 ms stabilization time after CE2 assertion before ADC sampling |
| 6 VFB | Feedback Input | Monitors regulated output; connects to resistor divider for adjustable versions-fixed 2.0 V version ties internally |
| 7 VOUT | Regulated Output | Delivers 2.0 V to load; requires 22 µF ceramic output capacitor (low-ESR, ≥1.5× VOUT rating) |
| 8 BOLX | Boost Switching Node | Connects to boost inductor; high dv/dt node-keep trace short and away from sensitive analog signals |
| 9 PGND | Power Ground (Pin 9) | Main return path for switching currents; connect to thermal pad and PCB ground plane |
| 10 PGND | Power Ground (Pin 10) | Second dedicated PGND pin-improves current sharing and reduces ground bounce |
| 11 BULX | Buck Switching Node | Connects to buck inductor; shares same high-frequency switching constraints as BOLX |
| 12 PVIN | Main Power Input | Accepts 1.8–5.5 V input; requires 10 µF ceramic input capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Battery Monitor | VIN/3 buffered output with 0.1 µA IQ enables accurate, low-overhead battery SOC estimation without external dividers or op-amps |
| Ultra-Low Quiescent Current | 0.3 µA typ. operating IQ and 0.01 µA standby IQ extend coin-cell life beyond 5 years in sleep-dominated applications |
| Auto-Discharge Function | 100 Ω internal NMOS discharges VOUT to <100 mV within 10 ms of CE1 deactivation-eliminates need for external discharge FET |
| Thermal Robustness | Thermal shutdown at 140°C (release at 100°C) combined with 3100 mW max power dissipation (DFN package) supports sustained 300 mA loads in confined spaces |
| VFM Light-Load Efficiency | Variable frequency modulation maintains >85% efficiency down to 10 µA load-critical for intermittent-sensing IoT nodes |
Applications
| Smart Watch Power Management | Wireless Health Sensor Node |
|---|---|
|
Use Scenario: CR2032-powered smartwatch with OLED display, accelerometer, and BLE radio operating in burst-mode sensing. IC Role / Device Role / Timing Role: Primary power regulator and battery fuel gauge-supplies 2.0 V to MCU and sensors while feeding VIN/3 to ADC for real-time battery % calculation. Use Value: Eliminates discrete voltage divider and LDO, reducing BOM count by 3 components and PCB area by 12 mm². |
Use Scenario: Disposable ECG patch using lithium coin cell, measuring biopotentials every 5 seconds and transmitting via Bluetooth LE. IC Role / Device Role / Timing Role: Dual-role power IC-regulates stable 2.0 V rail during active measurement/transmit cycles and enables precise battery monitoring only during 10-ms ADC window. Use Value: Achieves 3.2-year battery life (per IEC 62366) by limiting BM current to 0.1 µA × 0.2% duty cycle = 0.2 nA average drain. |
| Low-Power RF Module Supply | Energy-Harvesting Edge Node |
|
Use Scenario: Compact Zigbee module powered by two AAA batteries, requiring 2.0 V for transceiver and microcontroller across varying input (2.4–3.2 V). IC Role / Device Role / Timing Role: Buck-boost regulator maintaining constant 2.0 V output while monitoring input voltage decay to trigger low-battery alerts before brownout. Use Value: Wide 1.8–5.5 V input range accommodates full battery discharge curve without external pre-regulator or voltage supervisor. |
Use Scenario: Indoor light-harvesting sensor node using amorphous silicon PV cell (1.8–4.5 V output) powering temperature/humidity sensor and LoRa transmitter. IC Role / Device Role / Timing Role: Efficient energy converter harvesting microwatt-level ambient power and providing regulated 2.0 V, with BM verifying harvested voltage sufficiency before wake-up. Use Value: 0.3 µA IQ ensures net energy gain even under dim lighting (≥50 lux), enabling maintenance-free deployment for >7 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost with battery monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77650BEW+T | Single-inductor buck-boost with integrated charger, 1.8–5.5 V input, but no dedicated VIN/3 BM output-requires external resistor divider for battery monitoring | Lacks native BM function; adds 2 resistors, 1 capacitor, and routing complexity; higher total solution IQ (1.2 µA) | Choose if battery charging is required alongside regulation; avoid if BM simplicity and ultra-low IQ are critical |
| TPS63802DLAR | 3 A buck-boost with PMBus interface and programmable VOUT, but no integrated battery monitor-BM must be implemented externally | Higher output current and digital control flexibility, but increases design effort and component count for battery monitoring | Select for high-current systems (>500 mA) needing dynamic voltage scaling; not suitable for space-constrained, ultra-low-power BM applications |
Compared with MAX77650BEW+T and TPS63802DLAR, RP605K203B-TR uniquely integrates a low-IQ, buffered VIN/3 battery monitor in a 12-pin DFN-reducing bill-of-materials, PCB area, and validation effort for battery-state-aware wearables where 300 mA output suffices.
Availability
RP605K203B-TR is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE sensor nodes, and energy-harvesting edge devices requiring stable component supply, guaranteed long-term availability, and RoHS-compliant packaging.
Supply support for RP605K203B-TR 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
Ricoh Electronics is a Japanese semiconductor manufacturer specializing in highly integrated power management ICs for portable and ultra-low-power applications, with decades of expertise in DC/DC conversion and battery interface solutions.
RP605K203B-TR belongs to the RP605x series-designed specifically for space-constrained, battery-operated devices where simultaneous high-efficiency regulation and precise, low-overhead battery state monitoring are essential.
FAQ
What is the purpose of the CE2 pin, and how should it be used?
The CE2 pin enables and disables the battery monitor (BM) section independently of the DC/DC converter. It must be driven high (>1.0 V) to activate the VIN/3 output, and a minimum 10 ms stabilization delay is required before sampling BM with an ADC. This allows precise, low-duty-cycle battery voltage measurement-reducing average BM current to nanampere levels and extending battery life significantly in intermittently active systems.
Does RP605K203B-TR require external compensation components?
No external compensation components are required. The RP605K203B-TR uses internal compensation optimized for the specified 22 µF output capacitor and 2.2 µH inductor. Deviating from the recommended COUT1 (22 µF ceramic, X5R/X7R, ≥1.5× VOUT rating) or L (2.2 µH, low-DCR, saturation-current-rated ≥600 mA) may cause instability or degraded transient response, as verified in the typical application circuit and test conditions.
How does the auto-discharge function operate, and when is it active?
The auto-discharge function (enabled by the 'B' suffix) activates automatically when CE1 transitions from high to low, turning on an internal 100 Ω NMOS between VOUT and PGND. This discharges the output capacitor to <100 mV within ~10 ms, eliminating residual voltage that could interfere with system reset or cause unintended peripheral wake-up-no external FET or control logic is needed.
Can RP605K203B-TR operate with input voltages below 1.8 V?
No. The absolute minimum input voltage is 1.8 V per the recommended operating conditions, and the undervoltage lockout (UVLO) release threshold is 1.55–1.80 V. Operation below 1.8 V is not guaranteed-output regulation fails, and the device enters UVLO shutdown. For sub-1.8 V sources (e.g., partially depleted coin cells), a different regulator with lower VIN min, such as the RP604Z, would be required.
RP605K203B-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nisshinbo Micro Devices Inc.
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
RP605K203B-TR FAQ
1.How can I place an order for RP605K203B-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for RP605K203B-TR 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 RP605K203B-TR reliable?
The price and inventory of RP605K203B-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RP605K203B-TR is usually 5 days.
3.What payment methods are accepted for RP605K203B-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP605K203B-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RP605K203B-TR?
RP605K203B-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RP605K203B-TR 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 RP605K203B-TR?
For technical support, including RP605K203B-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP605K203B-TR requirements.
6.How does Aetrix verify that RP605K203B-TR is sourced from the original manufacturer or authorized distributors?
All RP605K203B-TR 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 RP605K203B-TR meets industry standards.
7.What is the process for return or replacement of RP605K203B-TR?
All RP605K203B-TR units undergo pre-shipment inspection (PSI). If there is an issue with RP605K203B-TR, 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 RP605K203B-TR part is unused and in its original packaging.
Return procedure for RP605K203B-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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