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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1624 Datasheet

High-Speed Step-Down Controllers

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19-1227; Rev 1; 6/97
EVAALVUAAILTAIOBNLEKIT
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
_______________General Description
The MAX1624/MAX1625 are ultra-high-performance,
step-down DC-DC controllers 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, they deliver
over 35A from 1.1V to 3.5V with ±1% total accuracy from
a +5V ±10% supply. Excellent dynamic response cor-
rects output transients caused by the latest dynamically
clocked CPUs. These controllers achieve over 90% effi-
ciency by using synchronous rectification. Flying-capaci-
tor bootstrap circuitry drives inexpensive, external
N-channel MOSFETs.
The switching frequency is resistor programmable from
100kHz to 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 MAX1624 is available in a 24-pin SSOP and offers
additional features such as a digitally programmable out-
put in 100mV increments; adjustable transient response;
selectable 0.5%, 1%, or 2% AC load regulation; and gate
drive for a current-boost MOSFET. The MAX1625 is resis-
tor adjustable and comes in a 16-pin narrow SO pack-
age. Other features in both controllers include internal
digital soft-start, a power-good output, and a 3.5V ±1%
reference output. For a similar controller compatible with
the latest Intel VRM/VID specification, see the MAX1638*
data sheet.
________________________Applications
Pentium Pro™, Pentium II™, PowerPC™, Alpha™,
and K6™ Systems
Desktop Computers
LAN Servers
Industrial Computers
GTL Bus Termination
______________Ordering Information
PART
MAX1624EAG
MAX1625ESE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
24 SSOP
16 Narrow SO
Pin Configurations appear at end of data sheet.
*Future product.
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 90% Efficiency
o Excellent Transient Response
o Resistor-Programmable Fixed Switching
Frequency from 100kHz to 1MHz
o Over 35A Output Current
o Digitally Programmable Output from 1.1V to 3.5V
in 100mV Increments (MAX1624)
o Resistor-Adjustable Output down to 1.1V
(MAX1625)
o Remote Sensing
o Adjustable AC Loop Gain (MAX1624)
o GlitchCatcher™ Circuit for Fast Load-Transient
Response (MAX1624)
o Power-Good (PWROK) Output
o Current-Mode Feedback
o Digital Soft-Start
o Strong 2A Gate Drivers
o Current-Limited Output
__________Typical Operating Circuit
TO AGND
VCC VDD
CSH
TO VDD
MAX1625
PWROK
CSL
BST
DH
LX
FREQ
CC2
CC1
DL
PGND
FB
REF
AGND
(SIMPLIFIED)
N
N
INPUT
+5V
OUTPUT
1.1V 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

MAX1624 Datasheet

High-Speed Step-Down Controllers

No Preview Available !

High-Speed Step-Down Controllers 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)
24 Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
16 Pin Narrow SO (derate 8.70mW/°C above 70°C).....696mW
Operating Temperature Range
MAX162_E_ _.......................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +125°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, RFREQ = 33.3k, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
Input Voltage Range
Input Undervoltage Lockout
VCC Supply Current
CONDITIONS
VCC = VDD
VCC rising edge, 1% hysteresis
VCC = VDD = 5.5V,
Operating mode
FB overdrive = 200mV Standby mode
MIN TYP MAX
4.5 5.5
4.0 4.2
2.5
0.3
VDD Supply Current
VCC = VDD = 5.5V, FB overdrive = 200mV,
operating or standby mode
0.1
Reference Voltage
Reference Load Regulation
Reference Undervoltage Lockout
Reference Short-Circuit Current
FB Accuracy
FB Set Voltage
AC Load Regulation
(Note 3)
DC Load Regulation
(Note 3)
PWROK Trip Level
PWROK Output Voltage Low
PWROK Output Current High
Switching Frequency
No load
0µA < ILOAD < 100µA
Rising edge, 1% hysteresis
VREF = 0V
MAX1624, over line
and load (Note 1)
TA = +25°C to +85°C
TA = 0°C to +85°C
MAX1625, over line
and load (Note 2)
TA = +25°C to +85°C
TA = 0°C to +85°C
LG = GND
CSH - CSL =
0mV to 80mV
MAX1624 LG = REF
LG = VCC
MAX1625
LG = GND
CSH - CSL =
0mV to 80mV
MAX1624 LG = REF
LG = VCC
MAX1625
Rising FB, 1% hysteresis with respect to VREF
Falling FB, 1% hysteresis with respect to VREF
ISINK = 2mA, VCC = 4.5V
PWROK = 5.5V
RFREQ = 20k
RFREQ = 33.3k
RFREQ = 200k
3.465
2.7
0.5
-7.5
6.5
850
540
85
3.5
0.5
1
2
1
0.05
0.1
0.2
0.1
-6
8
1000
600
100
3.535
10
3.0
4.0
±1
±1.5
±1
±1.5
-4.5
9.5
0.4
1
1150
660
115
UNITS
V
V
mA
mA
V
mV
V
mA
%
%
%
%
%
V
µA
kHz
kHz
2 _______________________________________________________________________________________


Part Number MAX1624
Description High-Speed Step-Down Controllers
Maker Maxim
Total Page 24 Pages
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