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PDF MAX5041 Data sheet ( Hoja de datos )
| Número de pieza | MAX5041 | |
| Descripción | Dual-Phase / Parallelable / Average Current-Mode Controllers | |
| Fabricantes | Maxim Integrated | |
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19-2514; Rev 3; 8/04
Dual-Phase, Parallelable, Average Current-Mode
Controllers
General Description
The MAX5038/MAX5041 dual-phase, PWM controllers
provide high-output-current capability in a compact
package with a minimum number of external compo-
nents. The MAX5038/MAX5041 utilize a dual-phase,
average current-mode control that enables optimal use
of low RDS(ON) MOSFETs, eliminating the need for exter-
nal heatsinks even when delivering high output currents.
Differential sensing enables accurate control of the out-
put voltage, while adaptive voltage positioning provides
optimum transient response. An internal regulator
enables operation with input voltage ranges of +4.75V to
+5.5V or +8V to +28V. The high switching frequency, up
to 500kHz per phase, and dual-phase operation allow
the use of low-output inductor values and input capacitor
values. This accommodates the use of PC board-
embedded planar magnetics achieving superior reliabili-
ty, current sharing, thermal management, compact size,
and low system cost.
The MAX5038/MAX5041 also feature a clock input
(CLKIN) for synchronization to an external clock, and a
clock output (CLKOUT) with programmable phase delay
(relative to CLKIN) for paralleling multiple phases. The
MAX5038 offers a variety of factory-trimmed preset output
voltages (see Selector Guide) and the MAX5041 offers an
adjustable output voltage from +1.0V to +3.3V.
The MAX5038/MAX5041 operate over the extended
industrial temperature range (-40°C to +85°C) and are
available in a 28-pin SSOP package. Refer to the
MAX5037 data sheet for a VRM 9.0-compatible, VID-
controlled output voltage controller in a 44-pin MQFP or
QFN package.
Applications
Servers and Workstations
Point-Of-Load High-Current/High-Density
Telecom DC-DC Regulators
Networking Systems
Large-Memory Arrays
RAID Systems
High-End Desktop Computers
Features
♦ +4.75V to +5.5V or +8V to +28V Input Voltage
Range
♦ Up to 60A Output Current
♦ Internal Voltage Regulator for a +12V or +24V
Power Bus
♦ True Differential Remote Output Sensing
♦ Two Out-Of-Phase Controllers Reduce Input
Capacitance Requirement and Distribute Power
Dissipation
♦ Average Current-Mode Control
Superior Current Sharing Between Individual
Phases and Paralleled Modules
Accurate Current Limit Eliminates MOSFET and
Inductor Derating
♦ Integrated 4A Gate Drivers
♦ Selectable Fixed Frequency 250kHz or 500kHz Per
Phase (Up to 1MHz for 2 Phases)
♦ Fixed (MAX5038) or Adjustable (MAX5041) Output
Voltages
♦ 0.5% Accurate Reference (MAX5041B)
♦ External Frequency Synchronization from 125kHz
to 600kHz
♦ Internal PLL with Clock Output for Paralleling
Multiple DC-DC Converters
♦ Thermal Protection
♦ 28-Pin SSOP Package
Ordering Information
PART
TEMP RANGE PIN-
OUTPUT
PACKAGE VOLTAGE
MAX5038EAI12
MAX5038EAI15
MAX5038EAI18
MAX5038EAI25
MAX5038EAI33
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
28 SSOP
28 SSOP
28 SSOP
28 SSOP
28 SSOP
Fixed +1.2V
Fixed +1.5V
Fixed +1.8V
Fixed +2.5V
Fixed +3.3V
MAX5041EAI
-40°C to +85°C 28 SSOP Adj +1.0V to
+3.3V
MAX5041BEAI -40°C to +85°C 28 SSOP Adj +1.0V to
+3.3V
Pin Configuration appears at end of data sheet.
________________________________________________________________Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Dual-Phase, Parallelable, Average Current-Mode
Controllers
(Circuit of Figure 1. TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
EFFICIENCY vs. OUTPUT CURRENT AND
INTERNAL OSCILLATOR FREQUENCY
100
90
f = 500kHz
80 f = 250kHz
70
60
50
VIN = +5V
VOUT = +1.8V
40
0 4 8 12 16 20 24 28 32 36 40 44 48 52
IOUT (A)
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
100
90
80
70
VOUT = +1.5V VOUT = +1.8V
60
VOUT = +1.1V
50
40
30
20
10 VIN = +12V
fSW = 250kHz
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
IOUT (A)
SUPPLY CURRENT
vs. TEMPERATURE AND FREQUENCY
100
90
80 250kHz
70
60
50 125kHz
40
30
20 VIN = +12V
10 CDL_ = 22nF
CDH_ = 8.2nF
0
-40 -15
10
35
TEMPERATURE (°C)
60
85
EFFICIENCY vs. OUTPUT CURRENT
AND INPUT VOLTAGE
100
90
80 VIN = +12V
70
60 VIN = +5V
50
40
30
20
10 VOUT = +1.8V
fSW = 250kHz
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
IOUT (A)
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
100
90
80
70
VOUT = +1.5V
VOUT = +1.8V
60
50
VOUT = +1.1V
40
30
20
10 VIN = +5V
fSW = 500kHz
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
IOUT (A)
SUPPLY CURRENT
vs. TEMPERATURE AND FREQUENCY
175
600kHz
150
500kHz
125
100
75
50
VIN = +5V
CDL_ = 22nF
CDH_ = 8.2nF
25
-40 -15
10
35
TEMPERATURE (°C)
60
85
EFFICIENCY vs. OUTPUT CURRENT
100
90
80
70
60
50
40
30
20 VIN = +24V
10
VOUT = +1.8V
fSW = 125kHz
0
0 4 8 12 16 20 24 28 32 36 40 44 48 52
IOUT (A)
SUPPLY CURRENT
vs. FREQUENCY AND INPUT VOLTAGE
12.0
11.5
11.0
10.5 VIN = +24V
10.0
9.5
9.0
8.5 VIN = +12V
8.0
7.5
7.0
6.5
VIN = +5V EXTERNALCLOCK
NO DRIVER LOAD
6.0
100 150 200 250 300 350 400 450 500 550 600
FREQUENCY (kHz)
SUPPLY CURRENT
vs. LOAD CAPACITANCE PER DRIVER
100
90
80
70
60
50
40
30
20
10 VIN = +12V
fSW = 250kHz
0
1 3 5 7 9 11 13 15
CDRIVER (nF)
_______________________________________________________________________________________ 5
5 Page 
Dual-Phase, Parallelable, Average Current-Mode
Controllers
Detailed Description
The MAX5038/MAX5041 (Figures 1 and 2) average cur-
rent-mode PWM controllers drive two out-of-phase
buck converter channels. Average current-mode con-
trol improves current sharing between the channels
while minimizing component derating and size. Parallel
multiple MAX5038/MAX5041 regulators to increase the
output current capacity. For maximum ripple rejection
at the input, set the phase shift between phases to 90°
for two paralleled converters, or 60° for three paralleled
converters. Paralleling the MAX5038/MAX5041s
improves design flexibility in applications requiring
upgrades (higher load).
VIN = +12V
C1, C2
R1
VCC
C25
VCC
RX
C26
R4
R7
R8
C29 R6
C30
C28
3 PHASE
15 EN
21 IN
C39
28
CLKIN
SENSE -
SENSE +
CSN1
CSP1
9
8
14
13
DH1 17
LX1 18
DL1 19
VIN
Q1
C3–C7
L1
Q2 C12
D1
4
PLLCMP
MAX5038
BST1 16
VCC 20
C32
D3
C31
10
DIFF
11 EAN
12
EAOUT
7
CLP1
DH2 25
LX2 24
DL2 23
VIN C8–C11
D4
Q1
L2
Q2 C13
D2
5 CLP2
BST2 26
R2
R3
C27 R5
6
22 SGND
PGND
1
CSP2
2
CSN2
NOTE: SEE TABLE 1 FOR COMPONENT VALUES.
+1.8V AT 60A
VOUT
C14, C16–C24, LOAD
C15 C33
Figure 1. MAX5038 Typical Application Circuit, VIN = +12V
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MAX5041.PDF ] | |
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