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Analog Devices Inc./Maxim Integrated MAX1630CAI+
- Part No.:
- MAX1630CAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1630CAI+.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
MAX1630CAI+ from Maxim Integrated is a dual-output, buck-topology, synchronous PWM power-supply controller for notebook and subnotebook computers. It delivers adjustable 3.3V and 5V SMPS outputs (2.5V–5.5V range), integrates a 12V/120mA linear regulator, supports 4.2V–30V input, achieves up to 96% efficiency via Idle Mode™ and synchronous rectification, and provides programmable power-up sequencing with RESET output.
For engineers reviewing the MAX1630CAI+ datasheet, MAX1630CAI+ pinout, MAX1630CAI+ application, or MAX1630CAI+ equivalent, key selection criteria include its dual adjustable/fixed SMPS outputs, integrated 12V linear regulator, 28-pin SSOP package, 200kHz/300kHz selectable oscillator, and secondary feedback capability for auxiliary voltage generation in portable computing power architectures.
Technical Context
The MAX1630CAI+ implements two independent current-mode PWM controllers with Dual Mode™ feedback-supporting both fixed (3.3V/5V) and adjustable (2.5V–5.5V) outputs via FB3/FB5 pins. Each controller uses direct-summing comparators without error amplifiers, enabling fast transient response (<5 cycles at 300kHz) and cycle-by-cycle regulation.
It features an internal 5V VL rail powered by a linear regulator, automatic bootstrap switchover from VL to 5V SMPS output above 4.5V, and integrated gate drivers (1A sink/source) for external N-channel MOSFETs. The device includes on-chip overvoltage/undervoltage protection, digital soft-start, and logic-controlled sequencing via SEQ, RUN/ON3, and TIME/ON5 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +4.2V to +30V - supports wide battery input including Li-ion stacks and legacy 12V rails. |
| SMPS Output Range | 2.5V to 5.5V (adjustable) or fixed 3.3V/5.0V - enables flexible logic supply generation with resistor-divider tuning. |
| Oscillator Frequency | 200kHz or 300kHz (pin-selectable via SYNC) - balances efficiency vs. EMI in noise-sensitive mobile applications. |
| Efficiency | Up to 96% - achieved via synchronous rectification and Idle Mode™ for >80% efficiency across 1000:1 load range. |
| Quiescent Power | 2.5mW typical (+12V input, both SMPS on) - extends battery life in suspend/standby modes. |
| Shutdown Current | 4μA typical - minimizes leakage during system off-state. |
| Package | 28-pin SSOP - surface-mount compatible with high-density portable PCB layouts. |
Pinout & Package
MAX1630CAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, JEDEC MO-153 compliant, and lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB3 | 3.3V SMPS Feedback Input | Dual Mode input: tied to GND for fixed 3.3V; connected to resistor divider for adjustable mode (regulates at REF ≈ 2.5V). |
| FB5 | 5V SMPS Feedback Input | Dual Mode input: tied to GND for fixed 5V; connected to resistor divider for adjustable mode (regulates at REF ≈ 2.5V). |
| CSH3 / CSL3 | 3.3V Current Sense Inputs | CSH3 = high-side sense; CSL3 = low-side sense & fixed-mode feedback; 100mV current-limit threshold referenced to CSL3. |
| CSH5 / CSL5 | 5V Current Sense Inputs | CSH5 = high-side sense; CSL5 = low-side sense, bootstrap supply, and fixed-mode feedback; 100mV current-limit threshold. |
| DH3 / DL3 | 3.3V Gate Drivers | DH3 = floating high-side driver (LX3–BST3); DL3 = low-side driver (0V–VL); drives external N-MOSFETs. |
| DH5 / DL5 | 5V Gate Drivers | DH5 = floating high-side driver (LX5–BST5); DL5 = low-side driver (0V–VL); drives external N-MOSFETs. |
| SEQ | Power-Up Sequencing Control | Pin-strapped: GND = 5V before 3.3V; REF = independent ON3/ON5 control; VL = 3.3V before 5V. |
| RESET | Active-Low Timed Reset Output | Asserts after fixed 32,000 clock cycles post-power-up; logic-high when both outputs are in regulation. |
| SHDN | Active-Low Shutdown Input | Logic threshold ~1V; connects to V+ via 220kΩ for auto-start; pulls down to disable all regulators. |
| SECFB | Secondary Feedback Input | Regulates auxiliary winding at 2.5V; tied to VL if unused; enables quasi-regulated flyback outputs beyond 12V. |
| 12OUT | 12V Linear Regulator Output | 120mA max; powered from VDD; requires 1µF bypass; used for RTC, BIOS, or auxiliary analog rails. |
| VL | Internal 5V Rail Output | Supplies IC core and gate drivers; switches from linear regulator to 5V SMPS output above 4.5V for bootstrapping. |
| REF | Precision 2.5V Reference Output | ±2% accuracy; supplies feedback references for both SMPS loops; requires 1µF bypass. |
| RUN/ON3 | 3.3V SMPS Enable Input | Active-high; controls 3.3V output independently when SEQ = REF. |
| TIME/ON5 | 5V SMPS Enable & Timing Pin | Active-high enable for 5V output; also sets soft-start timing when capacitor connected. |
| SKIP | Idle Mode Disable Input | High = fixed-frequency PWM only (lowest noise); low = automatic Idle Mode™ for light-load efficiency. |
| V+ | Main Input Supply | Battery input; bypassed to PGND with 0.22µF; powers internal VL regulator and VDD shunt clamp. |
| GND / PGND | Analog & Power Grounds | GND = analog reference; PGND = high-current return for switching nodes and MOSFET sources. |
| BST3 / BST5 | Bootstrap Capacitor Connections | Each requires 0.1µF ceramic cap to respective LX pin; enables high-side N-MOSFET gate drive above V+. |
| LX3 / LX5 | Switching Node Outputs | Connect to inductor center taps; swing 2V below ground safely; drive synchronous rectifier timing. |
| SYNC | Oscillator Synchronization Input | Tied to VL = 300kHz; tied to GND = 200kHz; accepts 240–350kHz external clock for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Feedback | Single pin (FB3/FB5) selects fixed 3.3V/5V or adjustable mode via resistor divider - reduces BOM count and layout complexity. |
| Idle Mode™ Control | Automatically transitions between pulse-skipping (light load) and fixed-frequency PWM (heavy load) - maintains >80% efficiency across 1000:1 current range. |
| Programmable Sequencing | Three SEQ pin states define 3.3V/5V power-up order and RESET assertion logic - ensures safe initialization of CPU and memory subsystems. |
| Integrated 12V Linear Regulator | 120mA output with internal 18V overvoltage clamp - eliminates need for discrete LDO in RTC, keyboard, or always-on peripheral rails. |
| Secondary Feedback (SECFB) | 2.5V regulation point for coupled-inductor flyback windings - enables precise auxiliary voltages (e.g., 15V, 19V) without optocouplers or external references. |
| 2.5V Precision Reference | ±2% accuracy, <100ppm/°C drift, 100µA max load - serves as stable feedback source for both SMPS loops and external circuitry. |
Applications
| Mobile Computing Power Management | Notebook CPU Core Supply |
|---|---|
Use Scenario: Powering main logic rails (3.3V I/O, 5V peripherals) in subnotebook systems with Li-ion battery input (7.4V–12.6V). IC Role / Device Role / Timing Role: Dual-output buck controller managing independent sequencing, soft-start, and RESET signaling for SoC and chipset initialization. Use Value: Eliminates discrete DC-DC converters and sequencing ICs; 96% peak efficiency extends runtime by >18% versus legacy controllers under mixed-load conditions. | Use Scenario: Delivering tightly regulated 5V supply to CPU local VRM stages in ultra-thin notebooks where board space is constrained. IC Role / Device Role / Timing Role: Primary 5V SMPS controller with adjustable output, synchronized oscillator, and fast transient response (<1.7µs recovery at 300kHz). Use Value: Maintains ±1.5% output regulation during CPU burst loads; 300kHz operation allows smaller inductors (e.g., 4.7µH) without compromising ripple or thermal performance. |
| Embedded System Auxiliary Power | Portable Communication Baseband Supply |
Use Scenario: Generating 12V for real-time clock (RTC), BIOS flash, and always-on USB suspend circuits in industrial handhelds. IC Role / Device Role / Timing Role: Integrated 12V/120mA linear regulator (12OUT) powered from VDD, with internal 18V shunt clamp for overvoltage safety. Use Value: Replaces discrete 12V LDO + protection circuitry; quiescent current of 4μA in shutdown enables >1-year battery shelf life in maintenance-free deployments. | Use Scenario: Providing low-noise 3.3V supply to baseband processors and RF front-end ICs in PDA-class mobile communicators. IC Role / Device Role / Timing Role: 3.3V SMPS with SKIP pin forced high for fixed-frequency 300kHz operation - minimizing conducted EMI in sensitive RF bands. Use Value: Reduces RF interference by >15dB compared to variable-frequency alternatives; 2.5mW quiescent power preserves standby time during cellular registration cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1632CAI+ | Includes identical dual SMPS + 12V LDO, but adds output overvoltage/undervoltage protection and integrated fault latching - no SECFB pin. | Preferred for systems requiring autonomous fault shutdown (e.g., unattended medical devices) where auxiliary flyback regulation is unnecessary. | Select MAX1632CAI+ when OVP/UVP is mandatory and secondary winding control is not required. |
| TPS54290RGTR | Single 3.3V/5V dual-channel buck controller (not multi-output); no integrated 12V LDO or SECFB; supports 4.5V–28V input; 600kHz max frequency. | Suitable for cost-optimized designs where auxiliary 12V rail is generated externally and higher switching frequency is acceptable. | Choose TPS54290RGTR when footprint and BoM cost are prioritized over integrated auxiliary regulation and low-noise 200kHz operation. |
Compared with MAX1632CAI+, MAX1630CAI+ omits fault latching but retains SECFB for flexible flyback design; versus TPS54290RGTR, it offers integrated 12V LDO and lower EMI 200kHz/300kHz operation but lacks 600kHz high-frequency capability.
Availability
MAX1630CAI+ is available at Aetrix Electronics and suitable for notebook computers, PDAs, and desktop CPU local DC-DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1630CAI+ 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
Maxim Integrated (now part of Analog Devices) is a fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.
The MAX1630 family was designed specifically for multi-rail, low-noise, high-efficiency power conversion in portable computing - emphasizing battery life extension, compact layout, and robust sequencing for x86 and ARM-based platforms.
FAQ
What is the operating temperature range for MAX1630CAI+?
The MAX1630CAI+ is rated for 0°C to +70°C ambient operation, making it suitable for commercial-grade notebook and subnotebook applications where thermal management is controlled via chassis airflow or passive heatsinking. Its absolute maximum junction temperature is 150°C, and thermal shutdown activates at approximately 150°C with 10°C hysteresis.
Does MAX1630CAI+ support both fixed and adjustable output voltages?
Yes, MAX1630CAI+ supports Dual Mode™ operation on both FB3 and FB5 pins: tying either pin to GND configures fixed 3.3V or 5.0V output; connecting to a resistor divider enables adjustable output from 2.5V to 5.5V, regulated against the internal 2.5V reference. This flexibility simplifies design reuse across multiple platform voltage requirements.
How does the Idle Mode™ feature improve efficiency in MAX1630CAI+?
Idle Mode™ in MAX1630CAI+ dynamically reduces switching frequency under light loads while maintaining peak inductor current above 25% of full-scale limit - skipping cycles to minimize gate charge and transition losses. This achieves >80% efficiency down to 1mA load, extending battery life in suspend/standby modes far beyond conventional fixed-frequency controllers.
Can MAX1630CAI+ generate a 12V output, and how is it implemented?
Yes, MAX1630CAI+ integrates a 12V/120mA linear regulator (12OUT) powered from the VDD rail, which is derived from the main input via an internal resistor divider. It includes an 18V overvoltage shunt clamp and requires only a 1µF ceramic bypass capacitor. This eliminates the need for an external 12V LDO in RTC, BIOS, or always-on subsystems.
What is the function of the SECFB pin on MAX1630CAI+?
The SECFB pin on MAX1630CAI+ provides secondary feedback regulation for coupled-inductor flyback windings, setting the auxiliary output voltage to 2.5V via an external resistor divider. When unused, SECFB must be tied to VL. Unlike MAX1631/MAX1634, MAX1630CAI+ does not use SECFB for PWM steering - it is solely for auxiliary voltage trimming.
MAX1630CAI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (2), Linear (LDO) (1)
- Number of Outputs:
- 3
- Frequency - Switching:
- 200kHz ~ 300kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- 12V, 120mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 4.2V ~ 30V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
MAX1630CAI+ FAQ
1.How can I place an order for MAX1630CAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1630CAI+ 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 MAX1630CAI+ reliable?
The price and inventory of MAX1630CAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1630CAI+ is usually 5 days.
3.What payment methods are accepted for MAX1630CAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1630CAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1630CAI+?
MAX1630CAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1630CAI+ 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 MAX1630CAI+?
For technical support, including MAX1630CAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1630CAI+ requirements.
6.How does Aetrix verify that MAX1630CAI+ is sourced from the original manufacturer or authorized distributors?
All MAX1630CAI+ 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 MAX1630CAI+ meets industry standards.
7.What is the process for return or replacement of MAX1630CAI+?
All MAX1630CAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1630CAI+, 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 MAX1630CAI+ part is unused and in its original packaging.
Return procedure for MAX1630CAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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