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Analog Devices Inc./Maxim Integrated MAX1632EAI+
- Part No.:
- MAX1632EAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1632EAI+.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,054
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Product details
Overview
MAX1632EAI+ from Maxim Integrated is a dual-output, buck-topology power-supply controller for notebook and subnotebook computers, featuring 3.3V/5V synchronous PWM regulators, a 12V/120mA linear regulator, programmable power-up sequencing, and power-good signaling with delay. It operates from +4.2V to +30V input, delivers up to 96% efficiency via synchronous rectification and Idle Mode™ control, and supports fixed or adjustable outputs in a 28-pin SSOP package.
For engineers reviewing the MAX1632EAI+ datasheet, MAX1632EAI+ pinout, MAX1632EAI+ application, or MAX1632EAI+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for industrial embedded and mobile computing designs.
Technical Context
The MAX1632EAI+ integrates two independent current-mode PWM controllers-one for 3.3V and one for 5V outputs-each with Dual Mode™ feedback (fixed or adjustable), internal slope compensation, and cycle-by-cycle current limiting. It includes dedicated gate drivers (1A sink/source) for external N-channel MOSFETs, a 12V linear regulator powered from VDD, and on-chip 2.5V precision reference with ±2% tolerance.
It implements programmable power-up sequencing via SEQ pin (3.3V-first, 5V-first, or independent ON/OFF), generates RESET after 32,000 clock cycles, and features output overvoltage/undervoltage protection. Its Idle Mode™ reduces quiescent current to 4μA in shutdown and enables >80% efficiency across a 1000:1 load range, critical for battery life in suspend/standby modes.
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 without external pre-regulation. |
| Output Voltages | 3.3V fixed (±3.5%) and 5.0V fixed (±2.5%), plus adjustable mode (2.5V–5.5V) - enables flexible logic supply generation for mixed-voltage SoCs. |
| Oscillator Frequency | 200kHz or 300kHz (pin-selectable via SYNC) - balances efficiency vs. EMI; fixed-frequency operation minimizes RF interference in pen-entry and comms systems. |
| Efficiency | Up to 96% at full load; >80% from 1mA to 3A - extends runtime in dynamic CPU load scenarios and maintains regulation during deep sleep. |
| Quiescent Power | 2.5mW typical (+12V input, both SMPS on) - enables ultra-low standby consumption without compromising wake-up responsiveness. |
| Shutdown Current | 4μA typical - meets stringent battery-leakage budgets for long-term storage or always-on RTC subsystems. |
| Package | 28-pin SSOP (0.209" width) - surface-mount compatible with high-density notebook PCB layouts; RoHS-compliant and lead-free (+ suffix). |
Pinout & Package
MAX1632EAI+ uses a 28-pin SSOP (Shrink Small Outline Package) with 0.025" pitch, optimized for thermal performance and board space in portable computing applications. Pin functions are validated per Maxim's official datasheet Rev 4 (8/05).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB3 | 3.3V Feedback Input | Dual Mode™ pin: tied to GND for 3.3V fixed output; connected to resistor divider for adjustable mode (regulates at REF ≈2.5V). |
| FB5 | 5V Feedback Input | Dual Mode™ pin: tied to GND for 5V fixed output; connected to resistor divider for adjustable mode (regulates at REF ≈2.5V). |
| CSH3 / CSL3 | 3.3V Current Sense Inputs | CSH3 senses high-side MOSFET current; CSL3 serves as low-side sense and fixed-mode feedback node (100mV threshold). |
| CSH5 / CSL5 | 5V Current Sense Inputs | CSH5 senses high-side MOSFET current; CSL5 serves as low-side sense, fixed-mode feedback, and VL bootstrap supply when >4.5V. |
| DH3 / DH5 | High-Side Gate Drivers | Floating outputs driving N-channel MOSFET gates; swing from LX3/LX5 to BST3/BST5 - require 0.1µF boost capacitors. |
| DL3 / DL5 | Low-Side Gate Drivers | Ground-referenced outputs driving synchronous rectifiers; swing 0V to VL - enable efficient discontinuous conduction mode. |
| SEQ | Power-Up Sequencing Control | Pin-strapped selection: GND = 5V before 3.3V; REF = independent ON3/ON5 control; VL = 3.3V before 5V. |
| RESET | Active-Low Timed Reset Output | Asserts low for 32,000 oscillator cycles after power-up - provides deterministic system reset timing for CPU initialization. |
| SHDN | Active-Low Shutdown Input | Logic-threshold ~1V; connects to V+ via 220kΩ resistor for automatic start-up with 0.01µF timing capacitor. |
| VDD | 12V Linear Regulator Input | Supplies internal 12V/120mA LDO; also feeds SECFB divider and 18V overvoltage clamp - used only in MAX1632/MAX1635 variants. |
Key Features
| Feature | Design Value |
|---|---|
| Idle Mode™ Control | Reduces switching frequency under light load to cut gate-charge and transition losses - achieves 4μA shutdown current and >80% efficiency down to 1mA. |
| Dual Mode™ Feedback | Single-pin configuration (FB3/FB5) selects fixed 3.3V/5V or adjustable output - eliminates external DACs or trim-pots for BOM simplification. |
| Programmable Sequencing | Three SEQ pin states define startup order and RESET dependency - ensures safe power-rail ramp-up for multi-voltage processors and FPGAs. |
| Integrated 12V Linear Regulator | 120mA output derived from VDD with internal 18V shunt clamp - powers auxiliary circuits (e.g., display bias, audio codec) without extra ICs. |
| 2.5V Precision Reference | ±2% accuracy, 100µVpp noise, 100mA load capability - serves as stable feedback source for both SMPS loops and external analog circuitry. |
Applications
| Notebook CPU Core & I/O Power | Subnotebook System-on-Chip Supply |
|---|---|
Use Scenario: Dual-rail power delivery for Intel Pentium M or AMD Geode processors requiring tightly sequenced 3.3V I/O and 5V core supplies with fast transient response. IC Role / Device Role / Timing Role: Primary multi-output controller managing SMPS timing, sequencing, and fault monitoring - RESET asserts after 32,000 clocks to align with CPU boot ROM requirements. Use Value: Eliminates discrete sequencing ICs and external references; 96% peak efficiency extends battery life by >18 minutes per charge cycle in active use. |
Use Scenario: Compact power solution for ARM-based subnotebooks with integrated graphics, where board space limits use of multiple DC-DC converters. IC Role / Device Role / Timing Role: Single-chip power manager delivering 3.3V/5V/12V rails from single Li-ion input - SEQ=VL configures 3.3V-first startup to meet SoC boot voltage ordering. Use Value: Reduces component count by 7 parts versus discrete controller + LDO + reference solution; SSOP package fits within 8mm × 8mm footprint. |
| PDA Main Logic Supply | Mobile Communicator Baseband Power |
Use Scenario: Powering TI OMAP or Qualcomm MSM application processors in PDAs with dynamic voltage scaling and deep-sleep modes. IC Role / Device Role / Timing Role: Efficiency-optimized controller enabling Idle Mode™ during suspend - quiescent current drops to 4μA while maintaining regulated 3.3V rail for RTC and wake logic. Use Value: Extends shelf-life battery drain from 12% to <0.5% per month; soft-start prevents inrush current damage to thin-film polymer capacitors. |
Use Scenario: Generating clean, low-noise 3.3V and 5V supplies for GSM/GPRS baseband ICs sensitive to switching noise near RF front-end. IC Role / Device Role / Timing Role: Fixed-frequency PWM mode (SKIP=high) suppresses conducted EMI - 300kHz operation avoids interference with 2.4GHz Bluetooth bands. Use Value: Meets EN 55022 Class B radiated emissions without added ferrite beads or shielding - cuts EMC test failures by 100% in pre-compliance validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1635EAI+ | Same pinout, identical 3.3V/5V SMPS and 12V LDO; differs only in power-up sequence default (MAX1635 defaults to independent ON3/ON5 control). | Preferred when separate enable control of each SMPS is required - e.g., FPGA partial reconfiguration or dynamic voltage scaling. | Select MAX1635EAI+ if SEQ=REF behavior is needed; otherwise MAX1632EAI+ offers simpler 3.3V-first or 5V-first sequencing. |
| TPS54290RGTR | Single 3.3V/5V dual-output controller (no 12V LDO); 2.95V–20V input; 2.5% output accuracy; no Idle Mode™ - fixed 300kHz only. | Suitable for cost-sensitive designs omitting 12V auxiliary rail; lacks programmable sequencing and overvoltage protection. | Choose TPS54290RGTR only when 12V rail is unnecessary and strict sequencing/fault protection are not required. |
Compared with MAX1635EAI+, MAX1632EAI+ provides guaranteed 3.3V-first sequencing and integrated 12V LDO - eliminating external regulators in notebook designs. Versus TPS54290RGTR, it adds critical safety features (OVP/UVP), lower quiescent current, and adaptive efficiency modes essential for battery longevity.
Availability
MAX1632EAI+ is available at Aetrix Electronics and suitable for notebook computers, subnotebook systems, and mobile communicators requiring stable component supply with extended temperature support (-40°C to +85°C).
Supply support for MAX1632EAI+ 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 and mixed-signal ICs for power management, sensing, and communications.
The MAX1630–MAX1635 family was designed specifically for multi-rail, low-noise power delivery in portable computing - integrating sequencing, protection, and efficiency optimization into a single 28-pin controller to replace 4–6 discrete components.
FAQ
What is the operating temperature range for MAX1632EAI+?
The MAX1632EAI+ is rated for -40°C to +85°C ambient operation, making it suitable for industrial-grade notebooks and mobile devices exposed to extended environmental conditions. This extended range is confirmed in the "Ordering Information" table of the official datasheet (Rev 4, 8/05), where MAX1632EAI+ is explicitly listed with the -40°C to +85°C grade. The device maintains full electrical specifications across this range, including 96% peak efficiency and 4μA shutdown current.
Does MAX1632EAI+ support both fixed and adjustable output voltages?
Yes, MAX1632EAI+ supports both fixed and adjustable outputs via its Dual Mode™ architecture. For the 3.3V output, tying FB3 to GND selects fixed mode (3.39V ±3.5%); connecting FB3 to a resistor divider enables adjustment from 2.5V to 5.5V. Similarly, FB5 selects fixed 5.0V (5.13V ±2.5%) or adjustable mode. This is validated in the "Electrical Characteristics" table and "Pin Description" section, where FB3/FB5 functionality is explicitly defined for both modes.
How does the power-up sequencing work on MAX1632EAI+?
MAX1632EAI+ implements pin-strapped sequencing via the SEQ pin: SEQ = GND configures 5V-before-3.3V startup; SEQ = VL configures 3.3V-before-5V; SEQ = REF enables independent RUN/ON3 and TIME/ON5 controls. The RESET signal is asserted after 32,000 oscillator cycles and its assertion depends on the selected mode - e.g., in 3.3V-first mode, RESET is determined solely by the 3.3V output. This behavior is fully documented in the "Functional Diagram" and "Pin Description" sections of the datasheet.
What is the role of the VDD pin on MAX1632EAI+?
On MAX1632EAI+, the VDD pin serves three functions: (1) input supply for the integrated 12V/120mA linear regulator (12OUT), (2) connection point for the SECFB resistor divider to regulate auxiliary flyback windings, and (3) input to an internal 18V overvoltage shunt clamp. This is specific to MAX1632/MAX1635 variants - confirmed in the "Features" list and "Pin Description" table, which state "MAX1630/MAX1632/MAX1633/MAX1635 each contain 12V/120mA linear regulators."
Can MAX1632EAI+ operate in fixed-frequency PWM mode only?
Yes, MAX1632EAI+ can be forced into fixed-frequency PWM mode by asserting the SKIP pin high. In this mode, it operates continuously at either 200kHz or 300kHz (selected by SYNC pin), eliminating pulse-skipping noise - ideal for EMI-sensitive applications like mobile communications. The datasheet confirms SKIP = VL enables fixed-frequency operation "for lowest noise under all load conditions," and Table 3 explicitly defines SKIP=high as constant-frequency PWM regardless of load level.
MAX1632EAI+ 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:
- Active
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
MAX1632EAI+ FAQ
1.How can I place an order for MAX1632EAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1632EAI+ 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 MAX1632EAI+ reliable?
The price and inventory of MAX1632EAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1632EAI+ is usually 5 days.
3.What payment methods are accepted for MAX1632EAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1632EAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1632EAI+?
MAX1632EAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1632EAI+ 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 MAX1632EAI+?
For technical support, including MAX1632EAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1632EAI+ requirements.
6.How does Aetrix verify that MAX1632EAI+ is sourced from the original manufacturer or authorized distributors?
All MAX1632EAI+ 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 MAX1632EAI+ meets industry standards.
7.What is the process for return or replacement of MAX1632EAI+?
All MAX1632EAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1632EAI+, 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 MAX1632EAI+ part is unused and in its original packaging.
Return procedure for MAX1632EAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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