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PDF MAX5038A Data sheet ( Hoja de datos )
| Número de pieza | MAX5038A | |
| Descripción | Dual-Phase / Parallelable / Average-Current-Mode Controllers | |
| Fabricantes | Maxim Integrated | |
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19-3034; Rev 0; 10/03
Dual-Phase, Parallelable, Average-Current-Mode
Controllers
General Description
The MAX5038A/MAX5041A dual-phase, PWM controllers
provide high-output-current capability in a compact
package with a minimum number of external compo-
nents. The MAX5038A/MAX5041A 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 MAX5038A/MAX5041A 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
MAX5038A/MAX5041A also limit the reverse current in
case the bus voltage becomes higher than the regulat-
ed output voltage. The MAX5038A offers a variety of fac-
tory-trimmed preset output voltages (see Selector Guide)
and the MAX5041A offers an adjustable output voltage
between +1.0V to +3.3V.
The MAX5038A/MAX5041A operate over the extended
temperature range (-40°C to +85°C) and are available
in a 28-pin SSOP package. Refer to the MAX5037A and
MAX5065/MAX5067 data sheets for a VRM 9.0/VRM 9.1-
compatible, VID-controlled, adjustable output voltage
controller in a 44-pin MQFP/thin QFN or 28-pin SSOP
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
o +4.75V to +5.5V or +8V to +28V Input Voltage
Range
o Up to 60A Output Current
o Internal Voltage Regulator for a +12V or +24V
Power Bus
o True Differential Remote Output Sensing
o Two Out-Of-Phase Controllers Reduce Input
Capacitance Requirement and Distribute Power
Dissipation
o Average-Current-Mode Control
Superior Current Sharing Between Individual
Phases and Paralleled Modules
Accurate Current Limit Eliminates MOSFET and
Inductor Derating
o Limits Reverse-Current Sinking in Paralleled
Modules
o Integrated 4A Gate Drivers
o Selectable Fixed Frequency 250kHz or 500kHz per
Phase (Up to 1MHz for Two Phases)
o Fixed (MAX5038A) or Adjustable (MAX5041A)
Output Voltages
o External Frequency Synchronization from 125kHz
to 600kHz
o Internal PLL with Clock Output for Paralleling
Multiple DC-DC Converters
o Thermal Protection
o 28-Pin SSOP Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAX5038AEAI12
MAX5038AEAI15
MAX5038AEAI18
MAX5038AEAI25
MAX5038AEAI33
-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
MAX5041AEAI -40°C to +85°C 28 SSOP
Fixed +1.2
Fixed +1.5
Fixed +1.8
Fixed +2.5
Fixed +3.3
Adj +1.0 to
+3.3
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 MAX5038A/MAX5041A (Figures 1 and 2) average-
current-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 MAX5038A/MAX5041A regulators to increase
the output current capacity. For maximum ripple rejec-
tion at the input, set the phase shift between phases to
90° for two paralleled converters, or 60° for three paral-
leled converters. The paralleling capability of the
MAX5038A/MAX5041A 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
C3–C7
Q1
L1
Q2 C12
D1
MAX5038A
4
PLLCMP
BST1 16
VCC 20
C32
D3
C34 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. MAX5038A Typical Application Circuit, VIN = +12V
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MAX5038A.PDF ] | |
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