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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1639 Datasheet

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

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MAX1639 pdf
19-1337; Rev 0; 2/98
EVAALVUAAILTAIOBNLEKIT
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 ±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.
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. The MAX1639 is available in a 16-pin
narrow SOIC package.
________________________Applications
Local DC-DC Converters for CPUs
Workstations
Desktop Computers
LAN Servers
GTL Bus Termination
_______________Ordering Information
PART
MAX1639ESE
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
Pin Configuration appears at end of data sheet.
____________________________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 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
__________ Typical Operating Circuit
VCC
AGND
VDD
BST
TO VDD MAX1639 DH
PWROK
LX
DL
PGND
INPUT
+5V
OUTPUT
1.1V TO 4.5V
REF
FREQ
CC1
CC2
CSH
CSL
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1639 Datasheet

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

No Preview Available !

MAX1639 pdf
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)
DL to PGND................................................-0.3V to (VDD + 0.3V)
REF, CC1, CC2, 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)
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ....696mW
SO θJC...........................................................................65°C/W
Operating Temperature Range
MAX1639ESE....................................................-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 = +5V, PGND = AGND = 0V, FREQ = REF, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
FB Voltage
Input Voltage Range
Input Undervoltage Lockout
VCC Supply Current (ICC)
Includes line and load
regulation errors
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 = 60mV
FB overdrive = 0V
VREF = 0V
1.089
1.083
4.5
4.0
TYP
5
3.6
VDD Supply Current (IDD)
VCC = VDD = 5.5V, FB forced 60mV above
regulation point, operating or standby mode
Reference Voltage
Reference Load Regulation
Reference Undervoltage Lockout
Reference Short-Circuit Current
AC Load Regulation
DC Load Regulation
PWROK Trip Level
PWROK Output Voltage Low
PWROK Output Current High
Switching Frequency
Maximum Duty Cycle
FREQ Input Voltage
FREQ Input Voltage
No load
0µA < IREF < 100µA
Rising edge, 1% hysteresis
VREF = 0V
CSH - CSL = 0mV to 80mV
CSH - CSL = 0mV to 80mV
Rising FB, 1% hysteresis with respect to VREF
Falling FB, 1% hysteresis with respect to VREF
ISINK = 2mA, VCC = 4.5V
PWROK = 5.5V
FREQ = VCC
FREQ = REF
FREQ = AGND
FREQ = VCC
GND (low)
REF (mid)
VCC (high)
3.465 3.5
2.7
0.5
1
0.1
-7.5 -6
6.5 8
850 1000
540 600
255 300
85 90
3.3
VCC - 0.1
MAX
1.111
1.117
5.5
4.2
2.5
10
0.1
3.535
10
3.0
4.0
-4.5
9.5
0.4
1
1150
660
345
0.2
3.7
UNITS
V
V
V
mA
mA
V
mV
V
mA
%
%
%
V
µA
kHz
%
V
2 _______________________________________________________________________________________


Part Number MAX1639
Description High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
Maker Maxim
Total Page 13 Pages
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