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Renesas RAA230121GSB#HA0
- Part No.:
- RAA230121GSB#HA0
- Manufacturer:
- Renesas
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
RAA230121GSB#HA0.pdf
- Description:
- IC REG BUCK 3.3V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
RAA230121GSB#HA0 from Renesas Electronics is a 1-channel synchronous step-down DC/DC converter with integrated battery backup circuitry, designed for lithium primary cell–based backup systems. It operates from 4.5V to 16V input, delivers up to 3A output at fixed 3.3V, features 1.1MHz fixed-frequency PWM operation, auto PFM mode for light-load efficiency, and includes short-circuit latch protection and thermal shutdown at 165°C. It is used in smart meters and security devices requiring seamless power switchover.
For engineers reviewing the RAA230121GSB#HA0 datasheet, RAA230121GSB#HA0 pinout, RAA230121GSB#HA0 application, or RAA230121GSB#HA0 equivalent, key selection considerations include its 16-pin HTSSOP package, VBB_IN/VBB_OUT battery backup interface, EN and x_AutoPFM control logic, integrated discharge circuit, and fixed 3.3V output with ±2.5% accuracy under load.
Technical Context
The RAA230121GSB#HA0 implements a current-mode synchronous buck regulator with internal high-side (180 mΩ) and low-side (130 mΩ) MOSFETs, fixed 1.1 MHz switching frequency, and digital soft-start (2 ms typ.). Its battery backup function enables automatic switchover between main DC supply and lithium primary cell via dedicated VBB_IN and VBB_OUT pins, with on-resistances of 400 Ω (VBB_IN→VBB_OUT) and 100 Ω (VOUT→VBB_OUT).
Control logic includes active-high EN enabling full operation and x_AutoPFM pin selecting between auto PFM (light-load efficiency) and forced PWM (heavy-load stability). Protection includes latch-type short-circuit detection, auto-recovery thermal shutdown (165°C), and UVLO with 3.9V turn-on / 3.7V turn-off hysteresis - all operating independently of VREG (5.0V typ.) and grounded through five GND pins for thermal and noise integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports wide industrial input rails including 12V nominal systems and 16V transients. |
| Output Voltage | Fixed 3.3V - eliminates external feedback resistors; ±2.5% accuracy ensures reliable MCU/SOC core rail compliance. |
| Max Output Current | 3A - sufficient for powering SoCs, wireless modules, and sensor hubs without external current boosting. |
| Switching Frequency | 1.1MHz (fixed) - enables compact LC filter design using ≤3.3 µH inductors and 22 µF ceramic output capacitors. |
| Shutdown Current | 1 µA (typ.) - minimizes battery drain during system standby in backup mode. |
| Battery Backup Interface | VBB_IN and VBB_OUT pins - provides seamless lithium primary cell switchover without external diodes or controllers. |
| Protection Features | Latch-type SCP, thermal shutdown (165°C), UVLO - ensures robust fault handling in unattended embedded deployments. |
Pinout & Package
RAA230121GSB#HA0 uses a 16-pin HTSSOP package (Renesas code PTSP0016JC-A) with exposed thermal pad connected to GND. The pinout supports high-current paths (LX, VIN, VOUT), dual ground routing (five GND pins), and dedicated battery backup terminals (VBB_IN, VBB_OUT).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Feedback node | Connects to output capacitor; monitors regulated 3.3V rail for closed-loop control. |
| 2 FB | Feedback input | Open for fixed-output variants; used only in adjustable versions (e.g., RAA230123). |
| 3 VBB_IN | Battery input | Accepts 2.7–3.7V lithium primary cell; enables backup source selection. |
| 4 VBB_OUT | Battery backup output | Delivers backup voltage to system; automatically switches between VOUT and VBB_IN based on relative voltage levels. |
| 5 EN | Enable input | Active-high logic: tie to VIN for always-on, or drive externally for controlled startup/shutdown. |
| 6 x_AutoPFM | Mode select | Low = auto PFM/PWM transition; High = forced PWM - critical for transient response tuning. |
| 7 VREG | Internal LDO output | Supplies 5.0V (typ.) to internal circuitry; requires 1 µF ceramic decoupling to GND. |
| 8–11, 15–16 GND | Power/Signal ground | Five dedicated GND pins minimize impedance and improve thermal dissipation via exposed pad. |
| 12 LX | Switch node | Connects to inductor; carries high di/dt switching current - requires tight layout to reduce EMI. |
| 13 Boost | Bootstrap supply | Requires 0.1 µF ceramic capacitor to LX for high-side gate drive; enables 100% duty cycle capability. |
| 14 VIN | Main power input | Accepts 4.5–16V; must be bypassed with ≥10 µF ceramic capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Topology | Integrated 180 mΩ/130 mΩ MOSFETs eliminate external power switches and reduce BOM count by 4+ components. |
| Auto PFM Mode | Enables >85% efficiency at 10 mA load while maintaining 1.1 MHz PWM at full 3A - extends battery life in intermittent-use applications. |
| Dedicated Battery Backup Circuit | VBB_IN/VBB_OUT interface replaces discrete diode-OR solutions, reducing voltage drop by ~0.3V and board area by 30%. |
| Integrated Discharge Function | Activates on EN deassertion to rapidly bleed output capacitance via internal switch - prevents residual voltage from interfering with system reset sequencing. |
| Robust Protection Suite | Latch-type SCP prevents repeated fault cycling; thermal shutdown (165°C) and UVLO (3.7V/3.9V) ensure safe operation across industrial temperature range (−40°C to +85°C). |
Applications
| Smart Meter Power Management | Security System Backup Supply |
|---|---|
Use Scenario: Maintains real-time clock, memory, and communication module during AC mains failure in residential/utility smart meters. IC Role / Device Role / Timing Role: Primary 3.3V DC/DC regulator with automatic lithium cell switchover via VBB_IN/VBB_OUT pins. Use Value: Eliminates need for external backup diodes and reduces voltage loss to <0.1V, extending 3.6V Li primary cell runtime by 22% versus discrete solutions. | Use Scenario: Powers door lock controllers, motion sensors, and alarm processors in building security panels during grid outage. IC Role / Device Role / Timing Role: Dual-role power IC: main 3.3V rail generator and battery-backed keep-alive supply. Use Value: Enables <1 µA shutdown current and seamless transition to backup mode within 10 µs - prevents false alarms during power flicker events. |
| Industrial Surveillance Camera | Home Gateway Router |
Use Scenario: Supplies image sensor, ISP, and Wi-Fi SoC in outdoor IP cameras exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Main 3.3V power stage with thermal shutdown (165°C) and UVLO hysteresis for stable operation in −40°C to +85°C environments. Use Value: Delivers full 3A output with <15 mVpp ripple (22 µF ceramic output cap) - ensures clean power for low-noise analog video signal chain. | Use Scenario: Powers baseband processor, Ethernet PHY, and USB peripherals in residential broadband gateways with PoE or wall adapter input. IC Role / Device Role / Timing Role: High-efficiency 3.3V buck converter supporting auto PFM for low-idle power and forced PWM for burst data transmission. Use Value: Achieves >92% efficiency at 500 mA (12V input) and <2 ms soft-start - prevents inrush-induced brownouts during router boot-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter with battery backup applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RAA230122GSB#HA0 | Fixed 5.0V output (vs. 3.3V); identical pinout, package, and feature set. | Suitable where system requires 5V I/O rail instead of 3.3V core rail - no PCB changes needed. | Select RAA230122GSB#HA0 only when 5V output is required; shares same thermal and layout constraints. |
| TPS63020DSJR | Buck-boost topology (2.5–5.5V input, 1.2–5.5V adjustable output); no integrated battery backup; 3A max. | Used where input voltage may fall below output (e.g., single-cell Li-ion systems); lacks VBB_IN/VBB_OUT functionality. | Choose TPS63020DSJR only for buck-boost flexibility - requires external backup circuitry and different feedback network. |
Compared with RAA230121GSB#HA0, RAA230122GSB#HA0 offers identical form-factor and protection but targets 5V loads, while TPS63020DSJR provides input voltage flexibility at the cost of losing integrated battery switchover and requiring additional components for backup functionality.
Availability
RAA230121GSB#HA0 is available at Aetrix Electronics and suitable for smart metering, security system backup, industrial surveillance camera, home gateway router, and building automation applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for RAA230121GSB#HA0 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
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.
The RAA23012x product line delivers highly integrated DC/DC converters with battery backup for mission-critical embedded systems where power continuity, small footprint, and industrial-grade reliability are essential.
FAQ
What is the output voltage configuration of the RAA230121GSB#HA0?
The RAA230121GSB#HA0 provides a fixed 3.3V output - no external feedback resistors are required. This configuration is confirmed in the Product Lineup Table (Page 2) and Electrical Characteristics section (Page 8), where VOUT is specified as "3.3V(fixed)" with ±2.5% accuracy. The FB pin remains open in this variant, unlike adjustable versions such as RAA230123.
Does the RAA230121GSB#HA0 support automatic power switchover between main supply and battery?
Yes, the RAA230121GSB#HA0 integrates a dedicated battery backup circuit with VBB_IN and VBB_OUT pins. As documented on Page 16, it automatically selects between VOUT and VBB_IN based on relative voltage levels - delivering VOUT during normal operation and switching to VBB_IN when main power fails. This eliminates external diodes and reduces voltage drop by up to 0.3V.
What package type and thermal characteristics does the RAA230121GSB#HA0 use?
The RAA230121GSB#HA0 uses a 16-pin HTSSOP package (Renesas code PTSP0016JC-A) with exposed thermal pad. Its total power dissipation is rated at 2900 mW at TA ≤ +25°C, derating by −29.0 mW/°C above that temperature (Page 6). Five GND pins and the exposed pad enable effective heat transfer to PCB copper layers per the specified 4-layer board layout.
How does the x_AutoPFM pin affect operation of the RAA230121GSB#HA0?
The x_AutoPFM pin determines switching mode behavior: logic low enables auto PFM (PFM at light load, PWM at heavy load), while logic high forces fixed PWM mode. This is explicitly defined in the Pin Function table (Page 5) and Detailed Description (Page 12). Unlike RAA23013x, the RAA230121GSB#HA0 supports both modes - critical for optimizing efficiency vs. transient response trade-offs.
What protection features are implemented in the RAA230121GSB#HA0?
The RAA230121GSB#HA0 includes latch-type short-circuit protection (SCP), auto-recovery thermal shutdown at 165°C (±20°C hysteresis), and auto-recovery UVLO with 3.9V turn-on / 3.7V turn-off thresholds. These are detailed in the Protection Circuit View (Page 18) and Absolute Maximum Ratings (Page 6). All protections operate independently of EN state and maintain VREG functionality during fault conditions.
RAA230121GSB#HA0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
RAA230121GSB#HA0 FAQ
1.How can I place an order for RAA230121GSB#HA0 through Aetrix?
Please submit a Request for Quotation (RFQ) for RAA230121GSB#HA0 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 RAA230121GSB#HA0 reliable?
The price and inventory of RAA230121GSB#HA0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RAA230121GSB#HA0 is usually 5 days.
3.What payment methods are accepted for RAA230121GSB#HA0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RAA230121GSB#HA0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RAA230121GSB#HA0?
RAA230121GSB#HA0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RAA230121GSB#HA0 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 RAA230121GSB#HA0?
For technical support, including RAA230121GSB#HA0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RAA230121GSB#HA0 requirements.
6.How does Aetrix verify that RAA230121GSB#HA0 is sourced from the original manufacturer or authorized distributors?
All RAA230121GSB#HA0 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 RAA230121GSB#HA0 meets industry standards.
7.What is the process for return or replacement of RAA230121GSB#HA0?
All RAA230121GSB#HA0 units undergo pre-shipment inspection (PSI). If there is an issue with RAA230121GSB#HA0, 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 RAA230121GSB#HA0 part is unused and in its original packaging.
Return procedure for RAA230121GSB#HA0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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