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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:3,706
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Product details
Overview
MAX1630CAI from Maxim Integrated is a dual-output, buck-topology, synchronous step-down power-supply controller for battery-powered notebook and subnotebook systems. It delivers adjustable 3.3V and 5.0V 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, 0°C to +70°C temperature grade, and support for secondary feedback regulation in compatible variants.
Technical Context
The MAX1630CAI implements two independent current-mode PWM controllers with Dual Mode™ feedback-supporting both fixed (3.3V/5.0V) and adjustable (2.5V–5.5V) output configurations via FB3/FB5 pins. It uses a shared 200kHz/300kHz synchronizable oscillator and features automatic bootstrapping, where VL switches from internal 5V LDO to regulated 5V SMPS output when VOUT exceeds 4.5V.
Fault protection includes output overvoltage and undervoltage lockout on both SMPS rails, with RESET propagation delay of 32,000 clock cycles and 1.5µs overvoltage-fault response. Idle Mode™ enables pulse-skipping at light loads (down to 4µA shutdown current), while SKIP pin assertion forces fixed-frequency PWM for low-noise operation.
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 logic supply generation with Dual Mode™ pin-strapping. |
| 12V Linear Regulator | 12V/120mA output - supplies auxiliary rails from VDD, with internal 18V overvoltage clamp. |
| Oscillator Frequency | 200kHz or 300kHz (pin-selectable via SYNC) - balances efficiency vs. EMI in portable designs. |
| Quiescent Power | 2.5mW typical (+12V input, both SMPS on) - extends battery life in suspend/standby modes. |
| Shutdown Current | 4µA typical - meets ultra-low-power requirements for system-level power gating. |
| Package | 28-pin SSOP - surface-mount footprint compatible with high-density notebook 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 rated for 0°C to +70°C ambient operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| FB3 | 3.3V SMPS Feedback Input | Dual Mode™ pin: GND = fixed 3.3V; resistor divider = adjustable 2.5V–5.5V regulation. |
| FB5 | 5V SMPS Feedback Input | Dual Mode™ pin: GND = fixed 5.0V; resistor divider = adjustable 2.5V–5.5V regulation. |
| CSH3/CSL3 | 3.3V Current Sense Inputs | CSH3 = high-side sense; CSL3 = low-side sense & fixed-mode feedback; 100mV current-limit threshold. |
| CSH5/CSL5 | 5V Current Sense Inputs | CSH5 = high-side sense; CSL5 = low-side sense, bootstrap supply, and fixed-mode feedback. |
| DH3/DL3 | 3.3V Gate Drivers | DH3 = floating high-side N-MOS driver (BST3 referenced); DL3 = low-side N-MOS driver (0V–VL swing). |
| DH5/DL5 | 5V Gate Drivers | DH5 = floating high-side N-MOS driver (BST5 referenced); DL5 = low-side N-MOS driver (0V–VL swing). |
| 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 oscillator cycles; monitors both SMPS outputs unless SEQ = REF. |
| SHDN | Active-Low Shutdown Input | Logic threshold ~1V; enables system-level power management with external RC timing network. |
| SKIP | Idle Mode Disable | High = fixed-frequency PWM only; low = automatic Idle Mode™ pulse-skipping for light-load efficiency. |
| VDD | Flyback Supply Input | Input for 12V linear regulator; connects to auxiliary winding; includes 18V shunt clamp. |
| 12OUT | 12V Linear Regulator Output | 12V/120mA output; bypass with ≥1µF capacitor; disabled when VDD < 13V or SECFB < 2.44V. |
| VL | Internal 5V Rail & Bias Supply | 5V/25mA output; powers IC core and gate drivers; auto-switches from LDO to 5V SMPS when VOUT > 4.5V. |
| REF | Precision 2.5V Reference | 2.5V ±2%, 100µA max load; used as feedback reference for both SMPS regulators. |
| RUN/ON3 & TIME/ON5 | 3.3V & 5V Enable Controls | Independent ON/OFF control; TIME/ON5 also serves as timing capacitor pin for soft-start delay. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Feedback | Single pin (FB3/FB5) selects fixed 3.3V/5.0V or adjustable 2.5V–5.5V output without external components. |
| Idle Mode™ Control | Reduces quiescent current to 4µA in shutdown and enables pulse-skipping below 100mA load for >80% efficiency at 1000:1 load range. |
| Programmable Sequencing | Three SEQ pin states define 5V-first, 3.3V-first, or independent enable timing - critical for CPU/core voltage ramp compliance. |
| Synchronous Rectification | Integrated 1A gate drivers (DH/DL) eliminate external Schottky losses and support >96% peak efficiency. |
| Secondary Feedback Support | VDD input and internal 18V clamp enable flyback-derived 12V rail; SECFB not present on MAX1630CAI but supported in family variants. |
Applications
| Notebook Power Management | Subnotebook DC-DC Conversion |
|---|---|
Use Scenario: Primary power controller in 12V-input notebook platforms requiring tightly sequenced 3.3V and 5V logic rails. IC Role / Device Role / Timing Role: Dual PWM controller managing buck converters for CPU I/O and chipset supplies with RESET coordination. Use Value: Eliminates need for discrete sequencing ICs and external 12V LDOs; reduces BOM count by integrating gate drivers, reference, and fault logic. | Use Scenario: Compact DC-DC solution in space-constrained subnotebooks with Li-ion battery input (7.4V–12.6V). IC Role / Device Role / Timing Role: Synchronous buck controller delivering 3.3V/5V from single inductor pair, with VL bootstrap enabling self-sustaining operation. Use Value: Achieves 96% peak efficiency and 4µA shutdown current - directly extending battery runtime in suspend mode. |
| PDA System Power | Mobile Communicator Baseband Supply |
Use Scenario: Multi-rail power source in PDAs with dynamic load profiles (e.g., LCD backlight, RF transceiver bursts). IC Role / Device Role / Timing Role: Dual-output controller with SKIP pin enabling noise-sensitive fixed-frequency mode during RF transmission. Use Value: Maintains <1% output ripple under 5A transient loads within five 300kHz cycles - stabilizing baseband processor voltage. | Use Scenario: Core supply for GSM/EDGE baseband processors requiring clean, sequenced 3.3V and 5V rails. IC Role / Device Role / Timing Role: Fault-protected controller with OV/UV lockout and 32k-cycle RESET delay ensuring reliable boot after brownout. Use Value: Prevents processor latch-up by holding RESET until both SMPS outputs stabilize - meeting JEDEC JESD84-A44 timing requirements. |
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 integrated overvoltage/undervoltage protection circuitry on both outputs. | Preferred for systems requiring autonomous fault response without external monitoring ICs. | Select MAX1632CAI if OV/UV fault latching and automatic shutdown are required; MAX1630CAI suffices where host MCU handles fault recovery. |
| TPS54294PWP | TI dual-channel 3.3V/5V buck controller; 4.5V–20V input; no integrated 12V LDO; requires external gate drivers. | Used in cost-optimized industrial designs where auxiliary 12V rail is generated separately. | Choose TPS54294PWP when board area allows discrete 12V generation and higher input voltage range (up to 20V) is needed. |
Compared with MAX1632CAI, MAX1630CAI omits autonomous OV/UV fault latching but retains identical sequencing, efficiency, and pinout - making it suitable for firmware-managed systems. Against TPS54294PWP, MAX1630CAI integrates more functions (12V LDO, REF, gate drivers) but has higher minimum input voltage (4.2V vs. 4.5V) and narrower temp range (0°C–70°C vs. –40°C–125°C).
Availability
MAX1630CAI is available at Aetrix Electronics and suitable for notebook computers, subnotebook systems, and mobile communicators requiring stable component supply with long-term lifecycle support.
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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for portable, industrial, and communications applications.
The MAX1630CAI belongs to Maxim's multi-output power-supply controller product line, designed specifically for battery-powered computing platforms requiring high efficiency, low quiescent current, and precise power sequencing across multiple voltage rails.
FAQ
What is the operating temperature range for the MAX1630CAI?
The MAX1630CAI is specified for commercial temperature operation from 0°C to +70°C. This grade is intended for indoor, non-industrial environments such as consumer notebooks and PDAs. The device does not support extended or automotive temperature ranges; for –40°C to +85°C operation, the MAX1630EAI+ variant must be selected instead of the MAX1630CAI.
Does the MAX1630CAI support secondary feedback regulation using the SECFB pin?
No, the MAX1630CAI does not include the SECFB pin or secondary feedback functionality. That feature is exclusive to the MAX1631 and MAX1634 variants in the same family. The MAX1630CAI instead integrates a dedicated 12V/120mA linear regulator (12OUT) powered from VDD, which is intended for flyback-derived auxiliary supplies - eliminating the need for external SECFB circuitry.
How does the MAX1630CAI achieve automatic bootstrapping of the VL supply?
The MAX1630CAI automatically switches the VL supply from its internal 5V LDO to the regulated 5V SMPS output when the 5V rail exceeds 4.5V. This transition is controlled by internal logic monitoring CSL5. Once engaged, VL is sourced from the 5V output, reducing power loss and enabling higher efficiency. The MAX1630CAI maintains VL regulation throughout this switchover, ensuring uninterrupted bias for gate drivers and internal circuitry.
Can the MAX1630CAI be used in fixed-frequency PWM mode only, without Idle Mode™?
Yes, asserting the SKIP pin high forces the MAX1630CAI into fixed-frequency PWM operation regardless of load conditions. In this mode, the device operates continuously at either 200kHz or 300kHz (selected by SYNC pin), eliminating pulse-skipping noise. This is recommended for RF-sensitive applications like mobile communicators where spectral purity is critical - and the MAX1630CAI maintains >80% efficiency across 1000:1 load range even in fixed-frequency mode.
What protection features are built into the MAX1630CAI?
MAX1630CAI includes output overvoltage and undervoltage protection on both 3.3V and 5V SMPS outputs, with RESET output asserting upon fault detection. It also features thermal shutdown at +150°C, input overvoltage clamp (36V absolute max on V+), and gate-driver shoot-through prevention. However, unlike the MAX1632CAI, it does not integrate autonomous fault latching - fault recovery requires external reset or host MCU intervention.
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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