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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1901 Datasheet

500kHz Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers

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19-2224; Rev 3; 12/03
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
General Description
The MAX1901/MAX1902/MAX1904 are buck-topology,
step-down, switch-mode, power-supply controllers that
generate logic-supply voltages in battery-powered sys-
tems. These high-performance, dual/triple-output devices
include on-board power-up sequencing, power-good sig-
naling with delay, digital soft-start, secondary winding
control, low dropout circuitry, internal frequency-compen-
sation networks, and automatic bootstrapping.
Up to 97% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ control
scheme. Efficiency is greater than 80% over a 1000:1
load-current range, which extends battery life in system
suspend or standby mode. Excellent dynamic response
corrects output load transients within five clock cycles.
Strong 1A on-board gate drivers ensure fast external N-
channel MOSFET switching.
These devices feature a logic-controlled and synchroniz-
able, fixed-frequency, pulse-width modulation (PWM)
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Asserting the SKIP pin enables fixed-frequency
mode, for lowest noise under all load conditions.
The MAX1901/MAX1902/MAX1904 include two PWM reg-
ulators, adjustable from 2.5V to 5.5V with fixed 5.0V and
3.3V modes. All these devices include secondary feed-
back regulation, and the MAX1902 contains a 12V/120mA
linear regulator. The MAX1901/MAX1904 include a sec-
ondary feedback input (SECFB), plus a control pin
(STEER) that selects which PWM (3.3V or 5V) receives the
secondary feedback signal. SECFB provides a method
for adjusting the secondary winding voltage regulation
point with an external resistor divider, and is intended to
aid in creating auxiliary voltages other than fixed 12V.
The MAX1901/MAX1902 contain internal output overvolt-
age and undervoltage protection features.
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters
Features
o 97% Efficiency
o 4.2V to 30V Input Range
o 2.5V to 5.5V Dual Adjustable Outputs
o Selectable 3.3V and 5V Fixed or Adjustable
Outputs (Dual Mode™)
o 12V Linear Regulator
o Adjustable Secondary Feedback
(MAX1901/MAX1904)
o 5V/50mA Linear Regulator Output
o Precision 2.5V Reference Output
o Programmable Power-Up Sequencing
o Power-Good (RESET) Output
o Output Overvoltage Protection
(MAX1901/MAX1902)
o Output Undervoltage Shutdown
(MAX1901/MAX1902)
o 333kHz/500kHz Low-Noise, Fixed-Frequency
Operation
o Low-Dropout, 98% Duty-Factor Operation
o 2.5mW Typical Quiescent Power (12V input, both
SMPSs on)
o 4µA Typical Shutdown Current
Ordering Information
PART
MAX1901EAI
MAX1901ETJ
MAX1902EAI
MAX1902ETJ
MAX1904EAI
MAX1904ETJ
TEMP RANGE
-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
-40°C to +85°C
PIN-PACKAGE
28 SSOP
32 Thin QFN 5mm x 5mm
28 SSOP
32 Thin QFN 5mm x 5mm
28 SSOP
32 Thin QFN 5mm x 5mm
Functional Diagram
INPUT
5V (RTC)
5V
LINEAR
12V
LINEAR
12V
3.3V 3.3V 5V
SMPS
SMPS
5V
Idle Mode is a trademark of Maxim Integrated Products, Inc.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
ON/OFF
POWER-UP POWER-
SEQUENCE GOOD
RESET
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1901 Datasheet

500kHz Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers

No Preview Available !

500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +36V
PGND to GND.....................................................................±0.3V
VL to GND ................................................................-0.3V to +6V
BST3, BST5 to GND ..............................................-0.3V to +36V
CSH3, CSH5 to GND................................................-0.3V to +6V
FB3 to GND ..............................................-0.3V to (CSL3 + 0.3V)
FB5 to GND ...............................................-0.3V to (CSL5 +0.3V)
LX3 to BST3..............................................................-6V to +0.3V
LX5 to BST5..............................................................-6V to +0.3V
REF, SYNC, SEQ, STEER, SKIP,
TIME/ON5, SECFB, RESET to GND ........-0.3V to (VL + 0.3V)
VDD to GND. ...........................................................-0.3V to +20V
RUN/ON3, SHDN to GND.............................-0.3V to (V+ + 0.3V)
12OUT to GND ..........................................-0.3V to (VDD + 0.3V)
DL3, DL5 to PGND........................................-0.3V to (VL + 0.3V)
DH3 to LX3 ..............................................-0.3V to (BST3 + 0.3V)
DH5 to LX5 ..............................................-0.3V to (BST5 + 0.3V)
VL, REF Short to GND ................................................Momentary
12OUT Short to GND..................................................Continuous
REF Current...........................................................+5mA to -1mA
VL Current.........................................................................+50mA
12OUT Current . .............................................................+200mA
VDD Shunt Current. ...........................................................+15mA
Continuous Power Dissipation (TA = +70°C)
28-Pin SSOP (derate 9.52mW/°C above +70°C) ......762mW
32-Pin Thin QFN (derate 21.3mW/°C above +70°C) ..1702mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10s) ................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0, REF load = 0, SKIP = 0, TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
MAIN SMPS CONTROLLERS
Input Voltage Range
3V Output Voltage in Adjustable Mode
CONDITIONS
V+ = 4.2V to 30V, CSH3 - CSL3 = 0,
CSL3 tied to FB3
MIN TYP MAX UNITS
4.2 30.0
2.42 2.5 2.58
V
V
3V Output Voltage in Fixed Mode
V+ = 4.2V to 30V, 0 < CSH3 - CSL3
< 80mV, FB3 = 0
3.20 3.39 3.47
V
5V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH5 - CSL5 = 0,
CSL5 tied to FB5
2.42 2.5 2.58
V
5V Output Voltage in Fixed Mode
Output Voltage Adjust Range
Adjustable-Mode Threshold Voltage
Load Regulation
Line Regulation
Current-Limit Threshold
Idle Mode Threshold
Soft-Start Ramp Time
Oscillator Frequency
V+ = 5.3V to 30V, 0 < CSH5 - CSL5
< 80mV, FB5 = 0
Either SMPS
Dual-mode comparator
Either SMPS, 0 < CSH_ - CSL_ < 80mV
Either SMPS, 5.2V < V+ < 30V
CSH3 - CSL3 or CSH5 - CSL5
SKIP = VL or VDD < 13V or SECFB < 2.44V
SKIP = 0, not tested
From enable to 95% full current limit with
respect to fOSC (Note 1)
SYNC = VL
SYNC = 0
4.85 5.13 5.25
V
REF 5.5 V
0.5 1.1 V
-2 %
0.03 %/V
80 100 120
mV
-50 -100 -150
10 25 40 mV
512 clks
450 500 550
kHz
283 333 383
2 _______________________________________________________________________________________


Part Number MAX1901
Description 500kHz Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers
Maker Maxim
Total Page 30 Pages
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