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PDF MAX1957 Data sheet ( Hoja de datos )
| Número de pieza | MAX1957 | |
| Descripción | Low-Cost / High-Frequency / Current-Mode PWM Buck Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2373; Rev 0; 4/02
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
General Description
The MAX1953/MAX1954/MAX1957 is a family of versa-
tile, economical, synchronous current-mode, pulse-width
modulation (PWM) buck controllers. These step-down
controllers are targeted for applications where cost and
size are critical.
The MAX1953 operates at a fixed 1MHz switching fre-
quency, thus significantly reducing external component
size and cost. Additionally, excellent transient response
is obtained using less output capacitance. The MAX1953
operates from low 3V to 5.5V input voltage and can sup-
ply up to 10A of output current. Selectable current limit is
provided to tailor to the external MOSFETs’ on-resistance
for optimum cost and performance. The output voltage is
adjustable from 0.8V to 0.86VIN.
With the MAX1954, the drain-voltage range on the high-
side FET is 3V to 13.2V and is independent of the supply
voltage. It operates at a fixed 300kHz switching frequen-
cy and can be used to provide up to 25A of output cur-
rent with high efficiency. The output voltage is adjustable
from 0.8V to 0.86VHSD.
The MAX1957 features a tracking output voltage range of
0.4V to 0.86VIN and is capable of sourcing or sinking
current for applications such as DDR bus termination
and PowerPC™/ASIC/DSP core supplies. The MAX1957
operates from a 3V to 5.5V input voltage and at a fixed
300kHz switching frequency.
The MAX1953/MAX1954/MAX1957 provide a COMP pin
that can be pulled low to shut down the converter in
addition to providing compensation to the error amplifier.
An input undervoltage lockout (ULVO) is provided to
ensure proper operation under power-sag conditions to
prevent the external power MOSFETs from overheating.
Internal digital soft-start is included to reduce inrush cur-
rent. The MAX1953/MAX1954/MAX1957 are available in
tiny 10-pin µMAX packages.
Applications
Printers and Scanners
Graphic Cards and Video Cards
PCs and Servers
Microprocessor Core Supply
Low-Voltage Distributed Power
Telecommunications and Networking
†Patent Pending
PowerPC is a trademark of Motorola, Inc.
Features
o Low-Cost Current-Mode Controllers
o Fixed-Frequency PWM
o MAX1953
1MHz Switching Frequency
Small Component Size, Low Cost
Adjustable Current Limit
o MAX1954
3V to 13.2V Input Voltage
25A Output Current Capability
93% Efficiency
300kHz Switching Frequency
o MAX1957
Tracking 0.4V to 0.86VIN Output Voltage Range
Sinking and Sourcing Capability of 3A
o Shutdown Feature
o All N-Channel MOSFET Design for Low Cost
o No Current-Sense Resistor Needed
o Internal Digital† Soft-Start
o Thermal Overload Protection
o Small 10-Pin µMAX Package
Ordering Information
PART
MAX1953EUB
MAX1954EUB
MAX1957EUB
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
10 µMAX
Pin Configurations
TOP VIEW
ILIM 1
COMP 2
FB 3
GND 4
IN 5
MAX1953EUB
10 BST
9 LX
8 DH
7 PGND
6 DL
µMAX
Pin Configurations continued 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  
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
(TA = +25°C, unless otherwise noted.)
MAX1957
OUTPUT VOLTAGE vs. LOAD CURRENT
1.35
1.30
1.25
VIN = 5V
1.20
1.15
-3
CIRCUIT OF FIGURE 3
-2 -1 0 1
LOAD CURRENT (A)
2
3
Typical Operating Characteristics (continued)
MAX1953
OUTPUT VOLTAGE vs. INPUT VOLTAGE
2.60
2.55
ILOAD = 3A
2.50
ILOAD = 0
2.45
2.40
3.0
CIRCUIT OF FIGURE 1
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
MAX1954
OUTPUT VOLTAGE vs. INPUT VOLTAGE
1.76
1.74
1.72
ILOAD = 0
1.70
1.68 ILOAD = 5A
1.66
1.64
3.0
CIRCUIT OF FIGURE 2
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
MAX1954
OUTPUT VOLTAGE vs. INPUT VOLTAGE
2.52
2.51
ILOAD = 0
2.50
2.49
ILOAD = 5A
2.48
2.47
2.46
3.0
CIRCUIT OF FIGURE 2
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
MAX1953
FREQUENCY vs. INPUT VOLTAGE
1.06 VOUT = 2.5V
1.04
TA = -40°C
1.02
1.00
TA = +85°C
0.98 TA = +25°C
0.96
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
MAX1957
OUTPUT VOLTAGE vs. INPUT VOLTAGE
1.29
1.27
ILOAD = 0
1.25
1.23 ILOAD = 3A
1.21
1.19
3.0
CIRCUIT OF FIGURE 3
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
MAX1954/MAX1957
FREQUENCY vs. INPUT VOLTAGE
320
VOUT = 1.25V
315
310
305 TA = -40°C
300
295 TA = +25°C
290
285
280 TA = +85°C
275
270
3.0
3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
_______________________________________________________________________________________ 5
5 Page 
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
Table 1. Suggested Components (continued)
DESIGNATION
C4
C5
C6
MAX1953
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
4.7µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ475MG
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
MAX1954
180µF, 4V SP Polymer
Panasonic
EEFUEOG181R
—
—
C7 —
—
C8 —
—
C9-C13
—
—
C14
CC
Cf
D1
L1
N1-N2
N3-N4
R1
R2
R3
RC
——
270pF, 10V X7R CER
Kemet
C0402C271M8RAC
—
Schottky diode
Central Semiconductor
CMPSH1-4
1µH 3.6A
Toko 817FY-1R0M
Dual MOSFET 20V 5A
Fairchild
FDS6898A
—
16.9kΩ 1%
8.06kΩ 1%
1000pF, 10V X7R CER
Kemet
C0402C102M8RAC
47pF, 10V C0G CER
Kemet
C0402C470K8GAC
Schottky diode
Central Semiconductor
CMPSH1-4
2.7µH 6.6A
Coilcraft
DO3316-272HC
Dual MOSFET 20V
Fairchild
FDS6890A
—
9.09kΩ 1%
8.06kΩ 1%
33kΩ 5%
62kΩ 5%
MAX1957
270µF, 2V SP Polymer
Panasonic
EEFUEOD271R
270µF, 2V SP Polymer
Panasonic
EEFUEOD271R
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
4.7µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ475MG
0.1µF, 50V X7R CER
Taiyo Yuden
UMK107BJ104KA
—
1500pF, 50V X7R CER
Murata
GRM39X7R152K50
470pF, 50V X7R CER
Murata
GRM39X7R471K50
68pF, 50V COG CER
Murata
GRM39COG680J50
Schottky diode
Central Semiconductor
CMPSH1-4
2.7µH 6.6A
Coilcraft
DO3316-272HC
Dual MOSFET 20V
Fairchild
FDS6898A
—
2kΩ 1%
2kΩ 1%
10kΩ 5%
51.1kΩ 5%
20A CIRCUIT
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
10µF, 6.3V X5R CER
Taiyo Yuden
JMK212BJ106MG
0.1µF, 50V X7R CER
Taiyo Yuden
UMK107BJ104KA
270µF, 2V SP polymer
Panasonic
EEFUEOD271R
270µF, 2V SP polymer
Panasonic
EEFUEOD271R
—
560pF, 10V X7R CER
Kemet
C0402C561M8RAC
15pF, 10V C0G CER
Kemet
C0402C150K8GAC
Schottky diode
Central Semiconductor
CMPSH1-4
0.8µH 27.5A
Sumida
CEP125U-0R8
N-channel 30V
International Rectifier
IRF7811W
N-channel 30V
Siliconix Si4842DY
10kΩ 1%
8.06kΩ 1%
270kΩ 5%
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX1957.PDF ] | |
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