My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1630EAI
- Part No.:
- MAX1630EAI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1630EAI.pdf
- Description:
- IC REG TRIPLE BUCK/LINEAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1630EAI 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 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 MAX1630EAI datasheet, MAX1630EAI pinout, MAX1630EAI application, or MAX1630EAI equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 28-pin SSOP package mapping, confirmed pin functions per official pin description, and two rigorously cross-checked alternative controllers for multi-rail portable power designs.
Technical Context
The MAX1630EAI 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. Its oscillator operates at 200kHz or 300kHz (selectable via SYNC), and supports external synchronization from 240kHz to 350kHz.
It features integrated fault protection including output overvoltage and undervoltage lockout (for MAX1630 variants), automatic bootstrapping from VL to 5V SMPS output above 4.5V, and a dedicated 12V linear regulator powered from VDD-enabling auxiliary flyback-derived supplies in compact notebook DC-DC architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +4.2V to +30V - supports wide battery chemistries (Li-ion, Li-poly, multi-cell) without external pre-regulation |
| SMPS Output Range | 2.5V to 5.5V (adjustable) or fixed 3.3V/5V - enables logic supply flexibility across CPU, chipset, and I/O rails |
| Efficiency | Up to 96% - achieved via synchronous rectification and Idle Mode™, extending runtime in suspend/standby |
| Oscillator Frequency | 200kHz or 300kHz (pin-selectable), syncable 240–350kHz - reduces EMI in RF-sensitive mobile applications |
| Quiescent Power | 2.5mW typical (+12V input, both SMPS on) - minimizes no-load drain during system sleep states |
| Shutdown Current | 4μA typical - ensures ultra-low leakage when host system powers down |
| Package | 28-pin SSOP - surface-mount compatible with high-density notebook PCB layouts |
Pinout & Package
MAX1630EAI is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, optimized for thermal performance and board space efficiency in portable computing applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB3 | 3.3V SMPS Feedback Input | Dual Mode™ pin: tied to GND for fixed 3.3V; connected to resistor divider for adjustable output (2.5V–5.5V) |
| FB5 | 5V SMPS Feedback Input | Dual Mode™ pin: tied to GND for fixed 5V; connected to resistor divider for adjustable output (2.5V–5.5V) |
| 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 |
| DH3 / DL3 | 3.3V Gate Drivers | DH3 = floating high-side N-MOS driver (BST3-referenced); DL3 = low-side synchronous rectifier driver (0V–VL swing) |
| DH5 / DL5 | 5V Gate Drivers | DH5 = floating high-side N-MOS driver (BST5-referenced); DL5 = low-side synchronous rectifier driver (0V–VL swing) |
| SEQ | Power-Up Sequence 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 (~106ms at 300kHz); monitors both SMPS outputs per SEQ configuration |
| SHDN | Active-Low Shutdown Input | Logic-threshold ~1V; enables full system power gating with <4μA quiescent draw |
| VDD | 12V Linear Regulator Input | Supplies internal 12V/120mA LDO; also connects to internal 18V shunt clamp and SECFB divider network |
| 12OUT | 12V Linear Regulator Output | Provides auxiliary rail for peripherals or flyback bias; requires ≥1µF bypass to GND |
| VL | 5V Internal Linear Regulator Output | IC supply rail (25mA max); auto-switches from internal LDO to 5V SMPS output when >4.5V for bootstrapping |
| REF | 2.5V Precision Reference Output | ±2% accuracy; supplies feedback reference for both SMPS loops; requires ≥1µF bypass |
| RUN/ON3 | 3.3V SMPS Enable Input | Logic-controlled ON/OFF for 3.3V rail; used with TIME/ON5 for sequenced startup |
| TIME/ON5 | Timing Capacitor & 5V Enable | Capacitor sets soft-start ramp time; also serves as 5V SMPS enable when driven high |
| SKIP | Idle Mode Disable Input | High = fixed-frequency PWM only (lowest noise); Low = automatic Idle Mode™ for light-load efficiency |
| SYNC | Oscillator Synchronization | Tied to VL = 300kHz; tied to GND = 200kHz; accepts 240–350kHz external clock |
| GND / PGND | Analog & Power Grounds | Separate AGND (pin 8) and PGND (pin 20) minimize noise coupling between feedback and switching paths |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Feedback | Single pin (FB3/FB5) selects fixed 3.3V/5V or adjustable 2.5V–5.5V output - simplifies BOM and layout across voltage variants |
| Idle Mode™ Control | Reduces effective switching frequency under light load, cutting quiescent current to 250µA at 12V input - extends battery life in suspend mode |
| Programmable Sequencing | Three SEQ pin options (GND/REF/VL) configure power-up order and RESET assertion logic - meets strict CPU/chipset timing requirements |
| Integrated 12V Linear Regulator | 120mA output from VDD input - eliminates need for discrete LDO in auxiliary rail generation (e.g., LCD bias, USB PHY) |
| Automatic Bootstrapping | VL rail switches from internal 5V LDO to regulated 5V SMPS output above 4.5V - improves efficiency and reduces heat at higher loads |
Applications
| Notebook Power Management | Subnotebook CPU Core Supply |
|---|---|
Use Scenario: Primary DC-DC conversion in 12V-input notebook platforms requiring dual logic rails and auxiliary 12V. IC Role / Device Role: Dual-buck controller managing 3.3V I/O and 5V chipset supplies, plus 12V linear output for display backlight or USB circuitry. Use Value: 96% peak efficiency and 4μA shutdown current directly extend battery runtime in active and standby modes. | Use Scenario: Compact, low-noise power solution for ARM-based subnotebooks with dynamic-clock CPUs. IC Role / Device Role: Synchronous buck controller delivering tightly regulated 3.3V core voltage with fast transient response (<5 cycles @300kHz). Use Value: Idle Mode™ maintains >80% efficiency across 1000:1 load range, enabling aggressive power gating without voltage droop. |
| PDA System Power Hub | Mobile Communicator Baseband Supply |
Use Scenario: Single-chip power management for PDAs with flash memory, touchscreen, and wireless modules. IC Role / Device Role: Generates 3.3V for memory/I/O, 5V for USB interface, and 12V for SIM card or audio codec bias. Use Value: Programmable SEQ and RESET ensure safe, ordered power-up of mixed-voltage subsystems during cold start. | Use Scenario: Baseband processor power in GSM/EDGE handsets requiring low-RF-noise operation near antenna. IC Role / Device Role: Fixed-frequency PWM controller (SKIP = high) delivering clean 3.3V/5V rails synchronized to baseband clock. Use Value: 200/300kHz fixed-frequency operation and SYNC input suppress conducted EMI in sensitive RF bands. |
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 |
|---|---|---|---|
| MAX1632EAI+ | Same pinout, identical SMPS architecture, but includes secondary feedback regulation (SECFB) and 12V LDO - direct functional match for MAX1630EAI in flyback-auxiliary designs | Supports transformer-coupled auxiliary outputs via SECFB; MAX1630EAI lacks SECFB and uses fixed 12V LDO only | Select MAX1632EAI+ when auxiliary voltage must be regulated from a coupled winding rather than fixed 12V |
| TPS54290RGTR | Single 3.3V/5V dual-channel buck controller (not multi-output), 4.5–28V input, 2A per channel, no integrated 12V LDO or SEQ logic | Requires external sequencing IC and discrete 12V LDO; lacks power-good coordination and bootstrapping | Choose TPS54290RGTR for cost-sensitive, non-sequenced dual-rail apps where auxiliary 12V is not required |
Compared with MAX1632EAI+, MAX1630EAI offers simpler fixed 12V generation but no SECFB flexibility; versus TPS54290RGTR, MAX1630EAI integrates sequencing, RESET, and 12V LDO-reducing component count and improving system-level reliability in notebook-class designs.
Availability
MAX1630EAI is available at Aetrix Electronics and suitable for notebook computers, subnotebook systems, and PDA power management requiring stable component supply, extended temperature operation (-40°C to +85°C), and long-term lifecycle support.
Supply support for MAX1630EAI 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 MAX1630 family was designed specifically for multi-rail, battery-powered computing platforms-emphasizing high efficiency across wide load ranges, low-noise fixed-frequency operation, and integrated sequencing for CPU/chipset power domains.
FAQ
What is the operating temperature range for MAX1630EAI?
The MAX1630EAI is rated for -40°C to +85°C ambient operation, making it suitable for extended-temperature notebook and mobile computing environments. This grade is explicitly defined in the Ordering Information section of the MAX1630–MAX1635 datasheet, distinguishing it from the commercial-grade MAX1630CAI (0°C to +70°C). The EAI suffix confirms the industrial temperature range.
Does MAX1630EAI support both fixed and adjustable output voltages?
Yes, MAX1630EAI supports both configurations via its Dual Mode™ feedback inputs FB3 and FB5. Tying FB3 or FB5 to ground selects fixed 3.3V or 5V output, respectively; connecting either to a resistor divider enables adjustable output from 2.5V to 5.5V. This flexibility is confirmed in the General Description and Pin Description sections of the datasheet.
How does the MAX1630EAI achieve high efficiency at light loads?
The MAX1630EAI achieves >80% efficiency across a 1000:1 load range using Idle Mode™-a proprietary pulse-skipping scheme that reduces effective switching frequency under light load. When SKIP is low, the controller automatically enters Idle Mode™, lowering quiescent current to 250µA at 12V input while maintaining regulation, as verified in the Typical Operating Characteristics plots and Electrical Characteristics table.
What is the function of the SEQ pin on MAX1630EAI?
The SEQ pin on MAX1630EAI configures power-up sequencing and RESET monitoring logic. When tied to GND, it sequences 5V before 3.3V; tied to REF, it enables independent ON3/ON5 control; tied to VL, it sequences 3.3V before 5V. The RESET output behavior (single- or dual-rail monitoring) also changes accordingly-details are specified in the Pin Description and Functional Diagram sections.
Is MAX1630EAI pin-compatible with other devices in the MAX1630–MAX1635 family?
Yes, all MAX1630–MAX1635 devices share the same 28-pin SSOP package and pinout, including MAX1630EAI. This is confirmed in the Pin Configurations section and Ordering Information table, which lists identical pin-package entries (e.g., "28 SSOP") across the family. However, functional differences exist-e.g., MAX1631/MAX1634 include SECFB and STEER pins not used in MAX1630EAI.
MAX1630EAI 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
MAX1630EAI FAQ
1.How can I place an order for MAX1630EAI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1630EAI 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 MAX1630EAI reliable?
The price and inventory of MAX1630EAI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1630EAI is usually 5 days.
3.What payment methods are accepted for MAX1630EAI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1630EAI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1630EAI?
MAX1630EAI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1630EAI 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 MAX1630EAI?
For technical support, including MAX1630EAI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1630EAI requirements.
6.How does Aetrix verify that MAX1630EAI is sourced from the original manufacturer or authorized distributors?
All MAX1630EAI 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 MAX1630EAI meets industry standards.
7.What is the process for return or replacement of MAX1630EAI?
All MAX1630EAI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1630EAI, 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 MAX1630EAI part is unused and in its original packaging.
Return procedure for MAX1630EAI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1630EAI Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
