MAX1953EUB+ Maxim Integrated Products, MAX1953EUB+ Datasheet
MAX1953EUB+
Manufacturer Part Number
MAX1953EUB+
Description
IC CNTRLR PWM BUCK 10-UMAX
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX1954EUB.pdf
(22 pages)
Specifications of MAX1953EUB+
Internal Switch(s)
No
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 4.73 V
Current - Output
10A
Frequency - Switching
1MHz
Voltage - Input
3 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Power - Output
444mW
Output Voltage
0.8 V
Input Voltage
3 V to 5.5 V
Supply Current
1 mA
Switching Frequency
1 MHz
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Duty Cycle (max)
89 %
Output Current
4000 mA
Mounting Style
SMD/SMT
Synchronous Pin
No
Topology
Boost, Buck
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 0.86V
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 0.86V
The MAX1957 features a tracking output voltage range of
0.4V to 0.86V
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.
19-2373; Rev 0; 4/02
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.
†Patent Pending
PowerPC is a trademark of Motorola, Inc.
Low-Cost, High-Frequency, Current-Mode PWM
Printers and Scanners
Graphic Cards and Video Cards
PCs and Servers
Microprocessor Core Supply
Low-Voltage Distributed Power
Telecommunications and Networking
IN
and is capable of sourcing or sinking
HSD
________________________________________________________________ Maxim Integrated Products
.
General Description
IN
.
Applications
o Low-Cost Current-Mode Controllers
o Fixed-Frequency PWM
o MAX1953
o MAX1954
o MAX1957
o Shutdown Feature
o All N-Channel MOSFET Design for Low Cost
o No Current-Sense Resistor Needed
o Internal Digital
o Thermal Overload Protection
o Small 10-Pin µMAX Package
Pin Configurations continued at end of data sheet.
MAX1953EUB
MAX1954EUB
MAX1957EUB
Tracking 0.4V to 0.86V
Sinking and Sourcing Capability of 3A
1MHz Switching Frequency
Small Component Size, Low Cost
Adjustable Current Limit
3V to 13.2V Input Voltage
25A Output Current Capability
93% Efficiency
300kHz Switching Frequency
PART
TOP VIEW
COMP
ILIM
GND
FB
IN
Buck Controller
†
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
1
2
3
4
5
Soft-Start
Ordering Information
MAX1953EUB
Pin Configurations
IN
MAX
Output Voltage Range
10 µMAX
10 µMAX
10 µMAX
10
9
8
7
6
PIN-PACKAGE
BST
LX
DH
PGND
DL
Features
1
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