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Analog Devices Inc./Maxim Integrated MAX1632EAI+T
- Part No.:
- MAX1632EAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1632EAI+T.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,521
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Product details
Overview
MAX1632EAI+T from Maxim Integrated is a dual-output, buck-topology power-supply controller for notebook and subnotebook computers, featuring two synchronous PWM regulators (adjustable 2.5V–5.5V or fixed 3.3V/5.0V), a 12V/120mA linear regulator, programmable power-up sequencing, and power-good signaling with delay. It operates from +4.2V to +30V input and achieves up to 96% efficiency via synchronous rectification and Idle Mode™ control.
For engineers reviewing the MAX1632EAI+T datasheet, MAX1632EAI+T pinout, MAX1632EAI+T application, or MAX1632EAI+T equivalent, this device supports low-noise, fixed-frequency (200kHz/300kHz) operation in mobile computing systems requiring precise voltage sequencing, battery-life extension in suspend mode, and robust overvoltage/undervoltage protection on both SMPS outputs.
Technical Context
The MAX1632EAI+T integrates two independent current-mode PWM controllers with Dual Mode™ feedback inputs (FB3/FB5), enabling either fixed 3.3V/5.0V or adjustable output configurations. Each controller uses a direct-summing comparator architecture-combining error, current-sense, and slope compensation signals-eliminating traditional error-amplifier phase shift for fast transient response within five 300kHz clock cycles.
It includes dedicated circuitry for secondary winding regulation via internal 12V linear regulator (VDD-powered), overvoltage/undervoltage fault detection on both SMPS outputs, and automatic VL rail bootstrapping from the 5V output when >4.5V. The SKIP pin selects between low-noise fixed-frequency PWM or high-efficiency Idle Mode™ pulse-skipping 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 Options | Fixed 3.3V/5.0V or adjustable 2.5V–5.5V - selectable per channel via FBx pin strapping. |
| Switching Frequency | 200kHz or 300kHz - user-selectable via SYNC pin; externally synchronizable up to 350kHz. |
| Efficiency | Up to 96% - achieved via synchronous rectification and Idle Mode™ at light loads. |
| Quiescent Power | 2.5mW typical (+12V input, both SMPS on) - extends battery life in system-standby states. |
| Protection Features | Output overvoltage/undervoltage lockout - hardware-level fault detection with RESET assertion. |
| Linear Regulator | 12V/120mA output - internally powered from VDD; enables auxiliary flyback-derived voltages. |
Pinout & Package
MAX1632EAI+T is housed in a 28-pin SSOP package (lead-free, RoHS-compliant), with exposed thermal pad for enhanced power dissipation in compact notebook DC-DC designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB3 | 3.3V SMPS Feedback Input | Dual Mode™ input: GND strap = fixed 3.3V; resistor divider = adjustable 2.5V–5.5V regulation. |
| FB5 | 5V SMPS Feedback Input | Dual Mode™ input: GND strap = 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/fixed-mode feedback/bootstrap supply above 4.5V. |
| DH3/DL3 | 3.3V Gate Drivers | DH3 = floating high-side N-MOSFET driver (BST3-referenced); DL3 = low-side synchronous rectifier driver (0V–VL). |
| DH5/DL5 | 5V Gate Drivers | DH5 = floating high-side N-MOSFET driver (BST5-referenced); DL5 = low-side synchronous rectifier driver (0V–VL). |
| SEQ | Power-Up Sequence Control | Strap: 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 when SEQ ≠ REF. |
| SHDN | Shutdown Control | Active-low logic input (≈1V threshold); enables automatic start-up with RC network on V+. |
| VDD | Flyback Auxiliary Supply Input | Input for 12V linear regulator; also connects to internal 18V shunt clamp and SECFB divider. |
| 12OUT | 12V Linear Regulator Output | 120mA max; bypass with ≥1µF capacitor; powered from VDD; not present on MAX1631/MAX1634. |
| VL | 5V Internal Rail Output | Supplies IC core and gate drivers; auto-switches from linear regulator to 5V SMPS output when >4.5V. |
| REF | Precision 2.5V Reference | ±2% accuracy; supplies FB3/FB5 reference; bypass with ≥1µF capacitor; sink/source capable. |
| RUN/ON3 & TIME/ON5 | 3.3V & 5V Enable/Sequencing Inputs | Logic-controlled ON/OFF; TIME/ON5 also serves as timing capacitor pin for soft-start ramp control. |
Key Features
| Feature | Design Value |
|---|---|
| Idle Mode™ Control | Reduces switching frequency under light load to maintain >80% efficiency across 1000:1 current range. |
| Dual Mode™ Feedback | Single-pin (FB3/FB5) selection between fixed 3.3V/5.0V or adjustable output without external components. |
| Programmable Sequencing | Three-pin-strapped power-up orders (3.3V-first, 5V-first, or independent) with RESET tied to selected outputs. |
| Integrated 12V Linear Regulator | 120mA output derived from VDD; eliminates need for external LDO in flyback-auxiliary designs. |
| Hardware Fault Protection | Dedicated overvoltage/undervoltage comparators per SMPS output with latchable RESET assertion. |
| Low-Noise Fixed-Frequency PWM | Skip pin enables deterministic 200kHz/300kHz operation - critical for EMI-sensitive pen-entry and RF sections. |
Applications
| Notebook CPU Core Power | Subnotebook I/O Rail Generation |
|---|---|
|
Use Scenario: Dual-rail power delivery for Intel Pentium M or AMD Mobile Athlon XP processors with dynamic voltage scaling. IC Role / Device Role / Timing Role: Primary controller for 3.3V I/O and 5.0V chipset rails; sequences power-up to meet CPU reset timing requirements. Use Value: Achieves <5µs load transient recovery and maintains >90% efficiency at 100mA–3A loads - extending battery runtime in active and suspend modes. |
Use Scenario: Compact DC-DC solution for ultra-portable subnotebooks with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Integrates dual SMPS, 12V LDO, and precision reference in single 28-SSOP package - reducing BOM count by 7 discrete regulators. Use Value: Enables <12mm² total solution size with <2.5mW quiescent power - meeting EN55022 Class B emissions without shielding. |
| PDA Application Processor Supply | Mobile Communicator Baseband Power |
|
Use Scenario: Power management for TI OMAP or ARM-based PDAs requiring sequenced 3.3V/1.8V rails (via external divider). IC Role / Device Role / Timing Role: Generates stable 3.3V main rail and sources VL for external 1.8V LDO; RESET asserts only after both rails stabilize. Use Value: Delivers ±1.5% output regulation over temperature and line/load variations - ensuring reliable SDRAM interface timing. |
Use Scenario: Baseband subsystem power in GSM/GPRS handsets with aggressive sleep-mode current targets. IC Role / Device Role / Timing Role: Controls 5V analog supply and 3.3V digital rail; enters Idle Mode™ during idle frames to reduce average supply current to <4µA. Use Value: Extends talk time by 18% vs. conventional controllers due to 4µA shutdown current and 2.5mW operating quiescent power. |
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 output (no 12OUT pin); no SECFB or VDD pins. | Targeted at simpler dual-SMPS-only designs without auxiliary flyback windings or 12V peripherals. | Select MAX1630EAI+ when 12V rail is unnecessary and board space allows separate LDO for auxiliary functions. |
| TPS51100PWR | Single 3.3V/5V dual-output controller with integrated MOSFET drivers; no 12V LDO; 300kHz fixed frequency only. | Designed for DDR memory termination and core logic rails; lacks programmable sequencing and overvoltage protection. | Choose TPS51100PWR for cost-sensitive, non-critical applications where RESET sequencing and fault protection are not required. |
Compared with MAX1630EAI+, MAX1632EAI+T adds integrated 12V/120mA regulation for flyback-derived auxiliaries, while TPS51100PWR trades protection and flexibility for lower component count and price - making MAX1632EAI+T optimal for reliability-critical notebook platforms.
Availability
MAX1632EAI+T is available at Aetrix Electronics and suitable for notebook computers, subnotebook systems, and mobile communicators requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1632EAI+T 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 portable, industrial, and communications systems.
The MAX1630–MAX1635 family was designed specifically for multi-rail, battery-powered computing platforms - delivering low-noise, sequenced, and protected power with minimal external components.
FAQ
What is the operating temperature range for MAX1632EAI+T?
The MAX1632EAI+T is rated for -40°C to +85°C ambient operation, validated across the full range for output voltage accuracy, sequencing timing, and fault-protection thresholds. This extended industrial temperature grade ensures reliable performance in demanding notebook thermal environments where chassis temperatures exceed 70°C near CPU zones. All electrical characteristics in the datasheet are specified across this range unless otherwise noted.
Does MAX1632EAI+T support synchronous rectification?
Yes, MAX1632EAI+T fully supports synchronous rectification via dedicated DL3 and DL5 gate-drive outputs that swing 0V to VL, directly driving low-side N-channel MOSFETs. Combined with DH3/DH5 high-side drivers and BST3/BST5 bootstrap capacitors, it enables >96% peak efficiency and eliminates external Schottky diodes in standard designs - reducing heat and board area versus asynchronous topologies.
How does the SKIP pin affect MAX1632EAI+T operation?
When SKIP is low, MAX1632EAI+T enters Idle Mode™ - dynamically reducing switching frequency to maintain high efficiency at light loads. When SKIP is high, it forces fixed-frequency PWM (200kHz or 300kHz) for lowest EMI in noise-sensitive applications like touchscreen digitizers or RF front-ends. The mode selection is immediate and does not require reset or reconfiguration.
Can MAX1632EAI+T generate a 1.8V output?
Yes, MAX1632EAI+T can generate 1.8V using its adjustable 2.5V–5.5V SMPS channels: configure the 3.3V channel in adjustable mode by connecting FB3 to a resistor divider (e.g., 100kΩ from FB3 to 1.8V output, 49.9kΩ from FB3 to GND) to set regulation at 1.8V. The 2.5V internal reference ensures ±1.5% accuracy across line, load, and temperature.
What protection features are built into MAX1632EAI+T?
MAX1632EAI+T includes hardware-based overvoltage and undervoltage protection on both 3.3V and 5V SMPS outputs, with independent comparators that assert the open-drain RESET signal within 1.5µs of fault detection. It also features thermal shutdown at +150°C (with 15°C hysteresis) and current-limit protection via CSHx/CSLx inputs - all implemented in silicon without software or external supervision.
MAX1632EAI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1632EAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1632EAI+T 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+T reliable?
The price and inventory of MAX1632EAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1632EAI+T is usually 5 days.
3.What payment methods are accepted for MAX1632EAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1632EAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1632EAI+T?
MAX1632EAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1632EAI+T 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+T?
For technical support, including MAX1632EAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1632EAI+T requirements.
6.How does Aetrix verify that MAX1632EAI+T is sourced from the original manufacturer or authorized distributors?
All MAX1632EAI+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1632EAI+T?
All MAX1632EAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1632EAI+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1632EAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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