MAX1638EAG+ by Analog Devices

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power


The MAX1638 is an ultra-high-performance, step-down DC-DC controller for CPU power in high-end computer systems. Designed for demanding applications in which output voltage precision and good transient response are critical for proper operation, it delivers over 35A from 1.3V to 3.5V with ±1% total accuracy from a +5V ±10% supply. Excellent dynamic response corrects output transients caused by the latest dynamically clocked CPUs. This controller achieves over 90% efficiency by using synchronous rectification. Flying-capacitor bootstrap circuitry drives inexpensive, external N-channel MOSFETs. The switching frequency is pin-selectable for 300kHz, 600kHz, or 1MHz. High switching frequencies allow the use of a small surface-mount inductor and decrease output filter capacitor requirements, reducing board area and system cost. The MAX1638 is available in 24-pin SSOP and QSOP (future package) packages, and offers additional features such as a digitally programmable output; adjustable transient response; and selectable 0.5%, 1%, or 2% AC load regulation. Fast recovery from load transients is ensured by a GlitchCatcher™ current-boost circuit that eliminates delays caused by the buck inductor. Output overvoltage protection is enforced by a crowbar circuit that turns on the low-side MOSFET with 100% duty factor when the output is 200mV above the normal regulation point. Other features include internal digital soft-start, a power-good output, and a 3.5V ±1% reference output.

Where to Buy

Prices starting from US$6.67

Distributor Stock
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Farnell
from US$10.65
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Analog Devices
from US$6.67
447
in stock
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Newark Electronics
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-
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Features

Better than ±1% Output Accuracy Over Line and Load
Greater than 90% Efficiency Using N-Channel MOSFETs
Pin-Selected High Switching Frequency (300kHz, 600kHz, or 1MHz)
Over 35A Output Current
Digitally Programmable Output from 1.3V to 3.5V
Current-Mode Control for Fast Transient Response and Cycle-by-Cycle Current-Limit Protection
Short-Circuit Protection with Foldback Current Limiting
Glitch-Catcher Circuit for Fast Load-Transient Response
Crowbar Overvoltage Protection
Power-Good (PWROK) Output
Digital Soft-Start
High-Current (2A) Drive Outputs
Complies with Intel VRM 8.2 Specification

Specifications

VIN (V) (min) 4.5
VIN (V) (max) 5.5
VOUT1 (V) (min) 1.3
VOUT1 (V) (max) 3.5
IOUT1 (A) (max) 35
Switch Type External
Output Adjust. Method Digital/VIDResistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 3006001000
Package/Pins SSOP/24
BudgetaryPrice (See Notes) 5.42


MAX1638EAG+ Semiconductors - ICs by Analog Devices

DC/DC CONTROLLER BUCK 1MHZ QSOP-24

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Supply Voltage Min 4.5V
Supply Voltage Max 5.5V
No. of Outputs -
Duty Cycle (%) 90%
Controller IC Case Style QSOP
No. of Pins 24Pins
Switching Frequency 1MHz
Topology Buck (Step Down)
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Product Range -
Automotive Qualification Standard -
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

High-Speed Step-Down Controlle | Analog Devices
DC/DC CONTROLLER, BUCK, 1MHZ, QSOP-24 | Farnell
Dc/Dc Controller, Buck, 1Mhz, Qsop-24 | Newark Electronics

Frequently Asked Questions

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Is the MAX1638EAG+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Analog Devices, Farnell and Newark Electronics have stock available or on a lead time for MAX1638EAG+ .

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