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PDF MAX1624 Data sheet ( Hoja de datos )
| Número de pieza | MAX1624 | |
| Descripción | High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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.
1 page  
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
__________________________________________Typical Operating Characteristics
(TA = +25°C, using the MAX1624 evaluation kit, unless otherwise noted.)
MAX1624
LOAD-TRANSIENT RESPONSE
(WITHOUT GLITCHCATCHER)
(1.1V)
LG = REF
A
B
C
MAX1624
LOAD-TRANSIENT RESPONSE
(WITH GLITCHCATCHER)
(1.1V )
LG = REF
A
B
C
MAX1624
LOAD-TRANSIENT RESPONSE DETAIL
(WITH GLITCHCATCHER)
(1.1V)
LG = REF
A
B
C
D
10µs/div
A: VOUT, 50mV/div, AC COUPLED
B: INDUCTOR CURRENT, 10A/div
C: LOAD CURRENT, 0A TO 10A, tRISE = tFALL = 100ns
10µs/div
A: VOUT, 50mV/div, AC COUPLED
B: INDUCTOR CURRENT, 10A/div
C: LOAD CURRENT, 0A TO 10A, tRISE = tFALL = 100ns
10µs/div
A: PDRV, 5V/div
B: VOUT, 50mV/div, AC COUPLED
C: NDRV, 5V/div
D: LOAD CURRENT, 0A TO 10A, tRISE = tFALL = 100ns
MAX1624
LOAD-TRANSIENT RESPONSE
(WITHOUT GLITCHCATCHER)
(2.5V)
LG = REF
A
B
C
10µs/div
A: VOUT, 50mV/div, AC COUPLED
B: INDUCTOR CURRENT, 10A/div
C: LOAD CURRENT, 0A TO 10A, tRISE = tFALL = 100ns
MAX1624
LOAD-TRANSIENT RESPONSE
(WITH GLITCHCATCHER)
(2.5V)
LG = REF
A
B
C
10µs/div
A: VOUT, 50mV/div, AC COUPLED
B: INDUCTOR CURRENT, 10A/div
C: LOAD CURRENT, 0A TO 10A, tRISE = tFALL = 100ns
MAX1624
LOAD-TRANSIENT RESPONSE
(WITHOUT GLITCHCATCHER)
(3.5V)
LG = REF
A
B
C
10µs/div
A: VOUT, 100mV/div, AC COUPLED
B: INDUCTOR CURRENT, 10A/div
C: LOAD CURRENT, 0A TO 11A, tRISE = tFALL = 100ns
_______________________________________________________________________________________ 5
5 Page 
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
Table 1. Component List for Standard 3.3V Applications by Load Current*
(Output Voltage = 3.3V, Frequency = 500kHz)
COMPONENT
Application Equipment
C1 Input Capacitor
C2 Output Capacitor
C10 Capacitor
CC1 Capacitor
CC2 Capacitor
D1 Rectifier
D2 Rectifier
L1 Inductor
N1 High-Side MOSFET
N2 Low-Side MOSFET
N3/P1 (MAX1624)
R1 Resistor
R2 Resistor
R3 Resistor
R11 Resistor (MAX1624)
RC1 Resistor
6A
Power PC/Pentium/GTL
bus termination
DESCRIPTION BY LOAD CURRENT
12A
11A
(LOW-COST VRM)
Pentium Pro
Pentium Pro
100µF, 10V Sanyo
OS-CON 10SL100M
3 x 100µF, 10V Sanyo
OS-CON 10SL100M
3 x 2700µF, 6.3V
aluminum electrolytic,
Sanyo 6MV2700GX
2 x 220µF, 4V Sanyo
OS-CON 4SP220M
3 x 220µF, 4V Sanyo
OS-CON 4SP220M
4 x 2700µF, 6.3V
aluminum electrolytic,
Sanyo 6MV2700GX
Optional (see text)
680pF ceramic
1000pF ceramic
1000pF ceramic
0.056µF ceramic
0.056µF ceramic
0.056µF ceramic
Optional Schottky,
Nihon
NSQ03A02
Optional Schottky,
Nihon
NSQ03A02
Optional Schottky,
Nihon
NSQ03A02
Central Semiconductor
CMPSH-3
Central Semiconductor
CMPSH-3
Central Semiconductor
CMPSH-3
1.5µH, 8A Coiltronics UP2-1R5
0.5µH, 17A Coilcraft
DO5022P-501HC
0.5µH Coiltronics UP4-R47,
Coilcraft DO5022P-501HC
International Rectifier IRF7413
International Rectifier
IRL3103S, D2PAK
International Rectifier IRF7413
x2
International Rectifier IRF7413
International Rectifier
IRL3103S, D2PAK
International Rectifier IRF7413
x2
International Rectifier IRF7107
12mΩ Dale WSL-2512-R012-F
2 x 12mΩ in parallel,
Dale WSL-2512-R012-F
2 x 12mΩ in parallel
Dale WSL-2512-R012-F
200kΩ, 1% resistor
100kΩ, 1% resistor
1kΩ, 5% resistor
N/A
N/A
500mΩ Dale WSL-2512-R500
1kΩ, 5% resistor
N/A
N/A
N/A
1kΩ, 5% resistor
*MAX1624: LG = REF, D4–D0 = 10010.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX1624.PDF ] | |
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