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MAX1639ESE+ Datasheet

  • MAX1639ESE+

  • 高速、同步整流、降壓型控制器，用于CPU電源

  • 13頁

  • MAXIM   MAXIM

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19-1337; Rev 0; 2/98
IT
TION K
VALUA
E
BLE
AVAILA
High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
________________General Description
The MAX1639 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 1.1V
to 4.5V with 鹵1% total accuracy from a +5V 鹵10% supply.
Excellent dynamic response corrects output transients
caused by the latest dynamically clocked CPUs. This
controller achieves over 90% efficiency by using synchro-
nous 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 out-
put filter capacitor requirements, reducing board area
and system cost.
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 鹵1% refer-
ence output. The MAX1639 is available in a 16-pin
narrow SOIC package.
____________________________Features
o
Better than 鹵1% Output Accuracy Over
Line and Load
o
Greater than 90% Efficiency Using N-Channel
MOSFETs
o
Pin-Selected High Switching Frequency:
300kHz, 600kHz, or 1MHz
o
Over 35A Output Current
o
Resistor-Divider Adjustable Output from
1.1V to 4.5V
o
Current-Mode Control for Fast Transient
Response and Cycle-by-Cycle Current-Limit
Protection
o
Short-Circuit Protection with Foldback Current
Limiting
o
Crowbar Overvoltage Protection
o
Power-Good (PWROK) Output
o
Digital Soft-Start
o
High-Current (2A) Drive Outputs
MAX1639
________________________Applications
Local DC-DC Converters for CPUs
Workstations
Desktop Computers
LAN Servers
GTL Bus Termination
__________
Typical Operating Circuit
INPUT
+5V
V
CC
AGND
TO V
DD
V
DD
BST
MAX1639
DH
LX
PWROK
OUTPUT
1.1V TO 4.5V
_______________Ordering Information
PART
MAX1639ESE
TEMP. RANGE
-40擄C to +85擄C
PIN-PACKAGE
16 Narrow SO
REF
DL
PGND
CSH
CSL
Pin Configuration appears at end of data sheet.
FREQ
CC1
CC2
FB
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.

MAX1639ESE+ 產品屬性

  • Lead (SnPb) Finish for COTSObsolescence Mitigation Program

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 1.2MHz

  • 84%

  • 4.5 V ~ 5.5 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 16-SOIC（0.154"，3.90mm 寬）

  • 管件

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