900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1638 Datasheet

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

No Preview Available !

19-1313; Rev 0; 11/97
EVAALVUAAILTAIOBNLEKIT
High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
_______________General Description
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 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.
The MAX1638 is available in 24-pin SSOP and QSOP
(future package) packages, and offers additional fea-
tures such as a digitally programmable output;
adjustable transient response; and selectable 0.5%, 1%,
or 2% AC load regulation. Fast recovery from load tran-
sients is ensured by a GlitchCatcher™ current-boost cir-
cuit 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% refer-
ence output.
________________________Applications
Pentium Pro™, Pentium II™, PowerPC™, Alpha™,
and K6™ Systems
Workstations
Desktop Computers
LAN Servers
GTL Bus Termination
______________Ordering Information
PART
MAX1638EAG
MAX1638EEG*
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 SSOP
24 QSOP
Pin Configuration appears at end of data sheet.
*Future product—contact factory for package availability.
Pentium Pro and Pentium II are trademarks of Intel Corp.
PowerPC is a trademark of IBM Corp.
Alpha is a trademark of Digital Equipment Corp.
K6 is a trademark of Advanced Micro Devices.
GlitchCatcher is a trademark of Maxim Integrated Products.
____________________________Features
o Better than ±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 Digitally Programmable Output from 1.3V to 3.5V
o Current-Mode Control for Fast Transient
Response and Cycle-by-Cycle Current-Limit
Protection
o Short-Circuit Protection with Foldback Current
Limiting
o Glitch-Catcher Circuit for Fast Load-Transient
Response
o Crowbar Overvoltage Protection
o Power-Good (PWROK) Output
o Digital Soft-Start
o High-Current (2A) Drive Outputs
o Complies with Intel VRM 8.2 Specification
__________Typical Operating Circuit
VCC
AGND
VDD
BST
TO VDD MAX1638 DH
LX
PWROK
D0
D1
DL
D2
D3 PGND
D4
REF
LG
FREQ
CC1
CC2
CSH
CSL
FB
INPUT
+5V
OUTPUT
1.3V TO 4.5V
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1638 Datasheet

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

No Preview Available !

High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
ABSOLUTE MAXIMUM RATINGS
VDD, VCC, PWROK to AGND ......................................-0.3V to 6V
PGND to AGND ..................................................................±0.3V
CSH, CSL to AGND ....................................-0.3V to (VCC + 0.3V)
NDRV, PDRV, DL to PGND.........................-0.3V to (VDD + 0.3V)
REF, CC1, CC2, LG, D0–D4, FREQ,
FB to AGND.............................................-0.3V to (VCC + 0.3V)
BST to PGND ............................................................-0.3V to 12V
BST to LX ....................................................................-0.3V to 6V
DH to LX.............................................(LX - 0.3V) to (BST + 0.3V)
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.70mW/°C above +70°C) .....................696mW
QSOP θJC..................................................................40°C/W
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
SSOP θJC ..................................................................45°C/W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = VCC = D4 = +5V, PGND = AGND = D0–D3 = 0V, FREQ = REF, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX
Output Voltage (FB) Accuracy
Input Voltage Range
Input Undervoltage Lockout
VCC Supply Current
Over line and load
(Note 1)
TA = +25°C to +85°C
TA = 0°C to +85°C
VCC = VDD
VCC rising edge, 1% hysteresis
VCC = VDD
= 5.5V
Operating
mode
Shutdown
mode
FB overdrive = 200mV
FB overdrive = 0V
DAC code = 11111
VREF = 0V
±1
±1.5
4.5 5.5
4.0 4.2
2.5
5
0.3
3.6 10
VDD Supply Current
VCC = VDD = 5.5V, FB forced 200mV above
regulation point, operating or standby mode
0.1
Reference Voltage
No load
3.465 3.5 3.535
Reference Load Regulation
0µA < IREF < 100µA
Reference Undervoltage Lockout Rising edge, 1% hysteresis
10
2.7 3.0
Reference Short-Circuit Current
AC Load Regulation
(Note 2)
DC Load Regulation
(Note 2)
PWROK Trip Level
PWROK Output Voltage Low
PWROK Output Current High
VREF = 0V
CSH - CSL =
0mV to 80mV
LG = GND
LG = REF
LG = VCC
CSH - CSL =
0mV to 80mV
LG = GND
LG = REF
LG = VCC
Rising FB, 1% hysteresis with respect to VREF
Falling FB, 1% hysteresis with respect to VREF
ISINK = 2mA, VCC = 4.5V
PWROK = 5.5V
0.5 4.0
0.5
1
2
0.05
0.1
0.2
-7.5 -6 -4.5
6.5 8 9.5
0.4
1
Switching Frequency
FREQ = VCC
FREQ = REF
850 1000 1150
540 600 660
FREQ = AGND
255 300 345
UNITS
%
V
V
mA
mA
V
mV
V
mA
%
%
%
V
µA
kHz
2 _______________________________________________________________________________________


Part Number MAX1638
Description High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
Maker Maxim
Total Page 16 Pages
PDF Download

MAX1638 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 MAX163 (MAX163 - MAX167) CMOS 12-Bit A/D Converters
Maxim Integrated Products
2 MAX1630 Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers
Maxim
3 MAX1630A (MAX1630A - MAX1635A) Multi Output Low Noise Power Supply Controllers
Maxim Integrated Products
4 MAX1631 Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers
Maxim
5 MAX1631A (MAX1630A - MAX1635A) Multi Output Low Noise Power Supply Controllers
Maxim Integrated Products
6 MAX1632 Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers
Maxim
7 MAX1632A (MAX1630A - MAX1635A) Multi Output Low Noise Power Supply Controllers
Maxim Integrated Products
8 MAX1633A (MAX1630A - MAX1635A) Multi Output Low Noise Power Supply Controllers
Maxim Integrated Products
9 MAX1634 Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers
Maxim





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy