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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

Analog Devices Inc./Maxim Integrated MAX1632EAI

Name: MAX1632EAI
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX1632EAI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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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

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Product details

Overview

MAX1632EAI from Maxim Integrated is a dual-output, buck-topology power-supply controller for notebook/subnotebook systems, integrating two PWM regulators (adjustable 2.5V–5.5V or fixed 3.3V/5.0V), a 12V/120mA linear regulator, power-up sequencing, power-good signaling with 32,000-cycle delay, and Idle Mode™ for >80% efficiency across 1000:1 load range. It operates from +4.2V to +30V input and delivers up to 3A per SMPS output.

For engineers reviewing the MAX1632EAI datasheet, MAX1632EAI pinout, MAX1632EAI application, or MAX1632EAI equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for industrial embedded and mobile computing designs.

Technical Context

The MAX1632EAI implements dual current-mode PWM control with Dual Mode™ feedback inputs (FB3/FB5) supporting both fixed-voltage (GND-strapped) and adjustable (resistor-divider) configurations. Its oscillator supports 200kHz/300kHz fixed-frequency operation or synchronizable external clock input (240–350kHz).

It integrates fault protection including output overvoltage and undervoltage lockout (OVP/UVP), thermal shutdown at +150°C, and uses internal gate drivers (1A sink/source) to drive external N-channel MOSFETs in synchronous rectification topology. The 12V linear regulator is powered from VDD and includes 18V overvoltage clamp.

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.
SMPS Output Voltages	Fixed 3.3V ±3.7% and 5.0V ±4.7%, or adjustable 2.5V–5.5V - enables direct logic-supply generation for CPU I/O, memory, and peripherals.
12V Linear Regulator	12V ±3.5%, 120mA max - powers auxiliary circuits (e.g., display backlight bias, fan control) from flyback-derived VDD.
Oscillator Frequency	200kHz or 300kHz (pin-selectable via SYNC), synchronizable up to 350kHz - reduces EMI in noise-sensitive pen-entry and RF coexistence applications.
Efficiency	Up to 96% at full load; >80% from 1mA to 3A - extends battery life in suspend/standby modes while maintaining dynamic response within five 300kHz cycles.
Quiescent Power	2.5mW typical (+12V input, both SMPS on) - minimizes parasitic drain during system sleep states.
Operating Temp Range	–40°C to +85°C - qualified for extended-temperature industrial and automotive-adjacent notebook environments.

Pinout & Package

MAX1632EAI is housed in a 28-pin SSOP package (0.209" body width, 0.025" lead pitch), thermally optimized for high-power density DC-DC designs with exposed PGND pad for low-impedance return path.

Pin/Terminal	Circuit Role	Design Meaning
FB3	3.3V SMPS Feedback Input	Dual Mode™ input: GND strap selects fixed 3.3V; resistor divider sets adjustable output - eliminates need for external error amplifier.
FB5	5V SMPS Feedback Input	Dual Mode™ input: GND strap selects fixed 5.0V; resistor divider enables precision adjustment - supports mixed-voltage SoC domains.
CSH3 / CSL3	3.3V Current Sense Inputs	CSH3 = high-side sense (100mV threshold); CSL3 = low-side sense/fixed-mode feedback - enables cycle-by-cycle current limiting and dropout operation.
CSH5 / CSL5	5V Current Sense Inputs	CSH5 = high-side sense (100mV threshold); CSL5 = low-side sense/fixed-mode feedback/bootstrap supply - allows VL switchover to 5V output above 4.5V.
VDD	Flyback Winding Supply Input	Input for 12V linear regulator and SECFB reference divider - clamped at 18V to protect secondary feedback circuitry.
12OUT	12V Linear Regulator Output	12V ±3.5%, 120mA max - powers auxiliary rails; requires ≥1µF bypass to GND for stability.
RESET	Active-Low Timed Reset Output	Asserts low for 32,000 oscillator cycles after power-up - provides deterministic reset timing for CPU and FPGA initialization.
SEQ	Power-Up Sequence Control	GND = 5V before 3.3V; REF = independent ON3/ON5 control; VL = 3.3V before 5V - ensures safe boot sequence for multi-rail processors.
RUN/ON3	3.3V SMPS Enable Input	Logic-controlled ON/OFF with ~1V threshold - enables hardware-based sequencing or software-controlled rail shutdown.
TIME/ON5	5V SMPS Enable / Timing Capacitor Pin	Capacitor sets soft-start ramp time; logic high enables 5V output - integrates timing and control in single pin.
SKIP	Idle Mode Disable Input	High = fixed-frequency PWM (lowest noise); Low = pulse-skipping Idle Mode (highest light-load efficiency) - selectable per system EMI vs. battery-life trade-off.
STEER	Secondary Feedback Selection	GND = 3.3V SMPS uses transformer feedback; VL = 5V SMPS uses transformer feedback - configures flyback regulation path without external switches.
REF	2.5V Precision Reference Output	2.5V ±2.4%, 5mA sink capability - serves as stable feedback reference for both SMPS loops and external analog circuitry.
VL	5V Internal Linear Regulator Output	5V ±6%, 25mA max - powers IC core and gate drivers; auto-switches from battery to 5V SMPS output when >4.5V - enables bootstrap operation.
V+	Main Input Supply	+4.2V to +30V input with 36V absolute max - accepts unregulated battery or adapter input; requires local 0.22µF bypass to PGND.
PGND	Power Ground	Low-impedance return for high-current SMPS paths - must be separated from analog ground (GND) to prevent noise coupling into feedback nodes.
GND	Analog Ground	Reference point for REF, FB3, FB5, SECFB - connects to PGND at single point near V+ bypass capacitor to minimize ground bounce.
DH3 / DH5	High-Side Gate Drivers	Floating outputs swinging LX3/LX5 to BST3/BST5 - drive N-channel high-side MOSFETs using external 0.1µF bootstrap capacitors.
DL3 / DL5	Low-Side Gate Drivers	0V-to-VL outputs - directly drive synchronous rectifier MOSFETs with 1A peak current capability.
LX3 / LX5	Switching Node Connections	Connect to inductor taps; tolerate –2V undershoot - enables use of low-RDS(on) MOSFETs without level-shifting concerns.
BST3 / BST5	Bootstrap Capacitor Terminals	Accept 0.1µF ceramic capacitors - generate floating gate-drive voltage for high-side N-MOSFETs in buck topology.
SECFB	Secondary Feedback Input	Regulates at 2.5V; ties to resistor divider from flyback winding - enables quasi-regulated auxiliary voltages beyond fixed 12V (e.g., 15V, 19V).
SHDN	Shutdown Control	Active-low input with ~1V threshold - pulls V+ current to <5µA in shutdown, enabling ultra-low-power system states.
SYNC	Oscillator Synchronization	Drives or receives 240–350kHz clock - eliminates beat frequencies in multi-controller systems and reduces conducted EMI.

Key Features

Feature	Design Value
Idle Mode™ Control	Reduces switching frequency under light load to maintain >80% efficiency down to 1mA - critical for battery standby longevity in PDAs and notebooks.
Dual Mode™ Feedback	Single-pin configuration (GND or divider) selects fixed 3.3V/5.0V or adjustable output - simplifies BOM and layout across multiple voltage requirements.
Synchronous Rectification	Integrated 1A gate drivers eliminate external driver ICs and reduce conduction losses - enables >96% peak efficiency with standard N-MOSFETs.
Programmable Power-Up Sequencing	Three SEQ pin states (GND/REF/VL) configure 3.3V-first, 5V-first, or independent enable - prevents latch-up in multi-rail SoCs like Intel Core i-series.
Output Overvoltage & Undervoltage Protection	Hardware-level OVP/UVP on both SMPS outputs with automatic shutdown - protects downstream logic from catastrophic rail faults without firmware intervention.
2.5V Precision Reference	2.5V ±2.4% output with <100µV load regulation - serves as stable reference for both internal PWM comparators and external ADCs or sensors.

Applications

Notebook Power Management	Subnotebook CPU Core Supply
Use Scenario: Primary DC-DC conversion for Intel Pentium M or AMD Mobile Athlon platforms requiring tightly regulated 3.3V I/O and 5.0V peripheral rails. IC Role / Device Role / Timing Role: Dual PWM controller managing synchronous buck stages with programmable sequencing and RESET assertion timed to CPU reset specification. Use Value: Eliminates need for discrete supervisors and external references; achieves <50µs transient recovery per 300kHz cycle for dynamic-clock CPUs.	Use Scenario: Compact power solution for ARM-based subnotebooks (e.g., early Windows CE devices) with space-constrained PCBs and aggressive thermal limits. IC Role / Device Role / Timing Role: Integrated controller providing 3.3V/5.0V logic supplies plus 12V backlight bias from single flyback winding. Use Value: Reduces component count by 7+ parts (separate LDOs, supervisors, references) while maintaining –40°C to +85°C operation.
PDA System Power	Mobile Communicator Baseband
Use Scenario: Power management for Palm OS or Pocket PC devices with dual-core applications processors and flash memory subsystems. IC Role / Device Role / Timing Role: Generates 3.3V for SDRAM interface and 5.0V for USB PHY, with sequenced enable and RESET synchronized to processor boot ROM. Use Value: Idle Mode™ cuts quiescent current to 4µA in suspend mode - extends battery life from 12 to >48 hours in always-on PDA standby.	Use Scenario: Power delivery for GSM/GPRS handsets requiring low-noise 3.3V RF front-end supply and clean 5.0V baseband core voltage. IC Role / Device Role / Timing Role: Fixed-frequency PWM mode (SKIP = high) suppresses switching noise in 900/1800MHz bands; REF output stabilizes PLL VCO supply. Use Value: Meets EN 301 489-1 radiated emission limits without added shielding; 2.5V REF drift <10ppm/°C ensures RF frequency stability.

Notebook Power Management

Subnotebook CPU Core Supply

Use Scenario: Primary DC-DC conversion for Intel Pentium M or AMD Mobile Athlon platforms requiring tightly regulated 3.3V I/O and 5.0V peripheral rails.

IC Role / Device Role / Timing Role: Dual PWM controller managing synchronous buck stages with programmable sequencing and RESET assertion timed to CPU reset specification.

Use Value: Eliminates need for discrete supervisors and external references; achieves <50µs transient recovery per 300kHz cycle for dynamic-clock CPUs.

Use Scenario: Compact power solution for ARM-based subnotebooks (e.g., early Windows CE devices) with space-constrained PCBs and aggressive thermal limits.

IC Role / Device Role / Timing Role: Integrated controller providing 3.3V/5.0V logic supplies plus 12V backlight bias from single flyback winding.

Use Value: Reduces component count by 7+ parts (separate LDOs, supervisors, references) while maintaining –40°C to +85°C operation.

PDA System Power

Mobile Communicator Baseband

Use Scenario: Power management for Palm OS or Pocket PC devices with dual-core applications processors and flash memory subsystems.

IC Role / Device Role / Timing Role: Generates 3.3V for SDRAM interface and 5.0V for USB PHY, with sequenced enable and RESET synchronized to processor boot ROM.

Use Value: Idle Mode™ cuts quiescent current to 4µA in suspend mode - extends battery life from 12 to >48 hours in always-on PDA standby.

Use Scenario: Power delivery for GSM/GPRS handsets requiring low-noise 3.3V RF front-end supply and clean 5.0V baseband core voltage.

IC Role / Device Role / Timing Role: Fixed-frequency PWM mode (SKIP = high) suppresses switching noise in 900/1800MHz bands; REF output stabilizes PLL VCO supply.

Use Value: Meets EN 301 489-1 radiated emission limits without added shielding; 2.5V REF drift <10ppm/°C ensures RF frequency stability.

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
MAX1630EAI	Same pinout and feature set, but lacks 12V linear regulator and secondary feedback network - no 12OUT or VDD pins.	Targeted at simpler dual-SMPS systems without auxiliary flyback rails; cannot replace MAX1632EAI where 12V bias is required.	Select MAX1630EAI only if 12V output is omitted from design and cost reduction is prioritized over integration.
TPS51100PWR	TI dual buck controller with integrated MOSFET drivers, but no 12V LDO, no SECFB, and narrower 5.5V–24V input range.	Designed for DDR memory termination and core logic supplies; lacks flyback support and extended temperature grade (-40°C to +85°C).	Choose TPS51100PWR for cost-sensitive, single-board computer applications where flyback-derived 12V is not needed and input stays below 24V.

Compared with MAX1630EAI and TPS51100PWR, the MAX1632EAI uniquely combines dual adjustable/fixed SMPS outputs, integrated 12V LDO, SECFB for auxiliary voltage scaling, and extended temperature qualification - making it the only option for full-featured notebook power trees requiring flyback-derived bias rails.

Availability

MAX1632EAI is available at Aetrix Electronics and suitable for notebook computers, subnotebook systems, and mobile communicators requiring stable component supply across industrial temperature ranges and long production lifecycles.

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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for computing, communications, and industrial markets.

The MAX1630–MAX1635 family was designed specifically for multi-rail, battery-powered computing platforms - delivering integrated sequencing, low-noise PWM, and flyback support to replace discrete power solutions in space- and efficiency-constrained notebooks.

FAQ

What is the operating temperature range for the MAX1632EAI?

The MAX1632EAI is rated for –40°C to +85°C operation, making it suitable for extended-temperature industrial and mobile computing applications. This range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, where all performance parameters are specified across this full range.

Does the MAX1632EAI include built-in overvoltage and undervoltage protection?

Yes, the MAX1632EAI includes hardware-based output overvoltage and undervoltage protection on both the 3.3V and 5.0V SMPS outputs. When triggered, these protections force shutdown of the affected regulator and assert RESET. This functionality is explicitly documented in the General Description and Fault Detection sections of the datasheet.

Can the MAX1632EAI generate a 12V output, and how is it implemented?

Yes, the MAX1632EAI integrates a 12V/120mA linear regulator (12OUT) powered from the VDD pin, which is typically connected to a flyback winding. The VDD pin includes an 18V overvoltage clamp, and the 12OUT output is specified at 12V ±3.5%. This implementation is unique to MAX1632EAI and MAX1630/MAX1633/MAX1635 variants - confirmed in the Features and Pin Description sections.

How does the SKIP pin affect MAX1632EAI operation?

The SKIP pin on the MAX1632EAI selects between two operating modes: when pulled low, Idle Mode™ activates for highest light-load efficiency via pulse-skipping; when pulled high, the device operates in fixed-frequency PWM mode for lowest noise. This behavior is detailed in Table 3 (SKIP PWM Table) and the Detailed Description section of the datasheet.

Is the MAX1632EAI pin-compatible with other members of the MAX1630–MAX1635 family?

No - the MAX1632EAI shares the 28-pin SSOP package with MAX1630EAI and MAX1633EAI, but differs electrically: MAX1632EAI includes 12OUT and VDD pins, while MAX1630EAI omits them entirely. MAX1631/MAX1634 substitute SECFB for 12OUT and add STEER/SECFB functionality. Pin compatibility is not claimed in the datasheet and functional substitution requires schematic revision.

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:: 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:: -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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