MAX1845 Maxim, MAX1845 Datasheet
MAX1845
Manufacturer Part Number
MAX1845
Description
Dual / High-Efficiency / Step-Down Controller with Accurate Current Limit
Manufacturer
Maxim
Datasheet
1.MAX1845.pdf
(27 pages)
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Pin Configurations appear at end of data sheet.
The MAX1845 is a dual PWM controller configured for
step-down (buck) topologies that provides high efficien-
cy, excellent transient response, and high DC output
accuracy necessary for stepping down high-voltage bat-
teries to generate low-voltage chipset and RAM power
supplies in notebook computers. The CS_ inputs can be
used with low-side sense resistors to provide accurate
current limits or can be connected to LX_, using low-side
MOSFETs as current-sense elements.
The on-demand PWM controllers are free running, con-
stant on-time with input feed-forward. This configuration
provides ultra-fast transient response, wide input-output
differential range, low supply current, and tight load-reg-
ulation characteristics. The MAX1845 is simple and easy
to compensate.
Single-stage buck conversion allows the MAX1845 to
directly step down high-voltage batteries for the highest
possible efficiency. Alternatively, two-stage conversion
(stepping down the 5V system supply instead of the bat-
tery at a higher switching frequency) allows the minimum
possible physical size.
The MAX1845 is intended for generating chipset, DRAM,
CPU I/O, or other low-voltage supplies down to 1V. For a
single-output version, refer to the MAX1844 data sheet.
The MAX1845 is available in 28-pin QSOP and 36-pin
thin QFN packages.
19-1955; Rev 2; 1/03
Quick-PWM and Dual Mode are trademarks of Maxim Integrated
Products.
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.
Notebook Computers
CPU Core Supplies
Chipset/RAM Supply as Low as 1V
1.8V and 2.5V I/O Supplies
________________________________________________________________ Maxim Integrated Products
Controller with Accurate Current Limit
General Description
Applications
Dual, High-Efficiency, Step-Down
o Ultra-High Efficiency
o Accurate Current-Limit Option
o Quick-PWM™ with 100ns Load-Step Response
o 1% V
o Dual Mode™ Fixed 1.8V/1.5V/Adj or 2.5V/Adj Outputs
o Adjustable 1V to 5.5V Output Range
o 2V to 28V Battery Input Range
o 200/300/420/540kHz Nominal Switching Frequency
o Adjustable Overvoltage Protection
o 1.7ms Digital Soft-Start
o Drives Large Synchronous-Rectifier FETs
o Power-Good Window Comparator
o 2V ±1% Reference Output
OUTPUT1
1.8V
MAX1845EEI
MAX1845ETX
5V INPUT
PART
OUT
Accuracy over Line and Load
Minimal Operating Circuit
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
TON
CS1
V
V
ILIM1
ILIM2
ON1
ON2
BST1
DH1
LX1
DL1
OUT1
PGOOD
REF
FB1
DD
CC
GND
OUT2
BST2
UVP
SKIP
OVP
DH2
CS2
DL2
FB2
LX2
V+
PIN-PACKAGE
28 QSOP
36 Thin QFN
6mm
Features
BATTERY
4.5V TO 28V
MAX1845EEI
✕
6mm
OUTPUT2
2.5V
1
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