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Maxim Integrated Products - (MAX1540 / MAX1541) Dual Step-Down Controllers with Saturation Protection / Dynamic Output and Linear Regulator

Numéro de référence MAX1541
Description (MAX1540 / MAX1541) Dual Step-Down Controllers with Saturation Protection / Dynamic Output and Linear Regulator
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MAX1541 fiche technique
19-2861; Rev 2; 1/05
EVAALVUAAILTAIOBNLEKIT
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
General Description
The MAX1540/MAX1541 dual pulse-width modulation
(PWM) controllers provide the high efficiency, excellent
transient response, and high DC-output accuracy nec-
essary for stepping down high-voltage batteries to gen-
erate low-voltage chipset and RAM power supplies in
notebook computers.
The Maxim proprietary Quick-PWM™ controllers are
free running, constant on-time with input feed forward.
This configuration provides ultra-fast transient
response, wide input-output (I/O) differential range, low
supply current, and tight load-regulation characteris-
tics. The controllers can accurately sense the inductor
current across an external current-sense resistor in
series with the output to ensure reliable overload and
inductor saturation protection. Alternatively, the con-
trollers can use the synchronous rectifier itself or loss-
less inductor current-sensing methods to provide
overload protection with lower power dissipation.
For a single step-down PWM controller with inductor-
saturation protection, external-reference input voltage,
and dynamically selectable output voltages, refer to the
MAX1992/MAX1993 data sheet.
Applications
Notebook Computers
Core/IO Supplies as Low as 0.7V
0.7V to 5.5V Supply Rails
CPU/Chipset/GPU with Dynamic Voltage Core
Supplies (MAX1541)
DDR Memory Termination (MAX1541)
Active Termination Buses (MAX1541)
Features
Inductor-Saturation Protection
Accurate Differential Current-Sense Inputs
Dual Ultra-High-Efficiency Quick-PWMs with
100ns Load-Step Response
MAX1540
1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable
Output (OUT1)
2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable
Output (OUT2)
Fixed 5V, 100mA Linear Regulator
MAX1541
External Reference Input (REFIN1)
Dynamically Selectable Output Voltage—0.7V
to 5.5V (OUT1)
2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable
Output (OUT2)
Optional Power-Good and Fault Blanking
During Transitions
Fixed 5V or Adjustable 100mA Linear Regulator
1% VOUT Accuracy over Line and Load
2V to 28V Battery Input Range
170kHz to 620kHz Selectable Switching
Frequency
Overvoltage/Undervoltage-Protection Option
1.7ms Digital Soft-Start
Drives Large Synchronous-Rectifier FETs
2V ±0.7% Reference Output
Separate Power-Good Window Comparators
Pin Configurations
TOP VIEW
PART
MAX1540ETJ
MAX1541ETL
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 Thin QFN 5mm x 5mm
40 Thin QFN 6mm x 6mm
OVP/UVP
SKIP
LSAT
TON
VCC
ILIM1
ILIM2
REF
1
2
3
4
5
6
7
8
MAX1540
24 LX1
23 BST1
22 LDOON
21 DL1
20 LDOOUT
19 V+
18 DL2
17 GND
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
THIN QFN
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.

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