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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.

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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 _______________________________________________________________________________________

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500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(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
Maximum Duty Factor
SYNC Input High-Pulse Width
SYNC Input Low-Pulse Width
SYNC Rise/Fall Time
SYNC Input Frequency Range
CONDITIONS
SYNC = VL
SYNC = 0 (Note 2)
Not tested
Not tested
Not tested
Current-Sense Input Leakage Current
V+ = VL = 0,
CSL3 = CSH3 = CSL5 = CSH5 = 5.5V
FLYBACK CONTROLLER
VDD Regulation Threshold
SECFB Regulation Threshold
DL Pulse Width
VDD Shunt Threshold
VDD Shunt Sink Current
VDD Leakage Current
12V LINEAR REGULATOR (Note 3)
12OUT Output Voltage
12OUT Current Limit
Quiescent VDD Current
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
VL Undervoltage Lockout-Fault Threshold
VL Switchover Threshold
REF Output Voltage
REF Load Regulation
REF Sink Current
REF Fault-Lockout Voltage
V+ Operating Supply Current
V+ Standby Supply Current
Falling edge (Note 3)
Falling edge (MAX1901/MAX1904)
VDD < 13V or SECFB < 2.44V
Rising edge, hysteresis = 1% (Note 3)
VDD = 20V (Note 3)
VDD = 5V, off mode (Notes 3, 4)
13V < VDD < 18V, 0 < ILOAD < 120mA
12OUT forced to 11V, VDD = 13V
VDD = 18V, run mode, no 12OUT load
SHDN = V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0mA < ILOAD < 50mA
Falling edge, hysteresis = 1%
Rising edge of CSL5, hysteresis = 1%
No external load (Note 5)
0 < ILOAD < 50µA
0 < ILOAD < 5mA
Falling edge
VL switched over to CSL5, 5V SMPS on
V+ = 5.5V to 30V, both SMPSs off, includes
current into SHDN
V+ Standby Supply Current in Dropout
V+ Shutdown Supply Current
V+ = 4.2V to 5.5V, both SMPSs off, includes
current into SHDN
V+ = 4.0V to 30V, SHDN = 0
MIN
95
96.5
200
200
400
TYP
97
98
0.01
MAX UNITS
%
ns
ns
200 ns
583 kHz
10 µA
13
2.44
18
10
0.75
14
2.60
20
30
V
V
µs
V
mA
µA
11.65
12.10
150
50
12.50
100
V
mA
µA
4.7 5.1 V
3.5
4.2
2.45
10
1.8
3.6 3.7
V
4.5 4.7
V
2.5 2.55
V
12.5
100.0
mV
µA
2.4 V
5 50 µA
30 60 µA
50 200 µA
4 10 µA
Quiescent Power Consumption
Both SMPSs enabled,
FB3 = FB5 = 0,
CSL3 = CSH3 = 3.5V,
CSL5 = CSH5 = 5.3V
(Note 3)
MAX1901/MAX1904
2.5 4
mW
1.5 4
_______________________________________________________________________________________ 3

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500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(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
FAULT DETECTION (MAX1901/MAX1902)
Overvoltage Trip Threshold
Overvoltage Fault Propagation Delay
Output Undervoltage Threshold
Output Undervoltage Lockout Time
Thermal-Shutdown Threshold
RESET
RESET Trip Threshold
RESET Propagation Delay
RESET Delay Time
INPUTS AND OUTPUTS
Feedback-Input Leakage Current
Logic Input-Low Voltage
Logic Input-High Voltage
Input Leakage Current
Logic Output-Low Voltage
Logic Output-High Current
TIME/ON5 Input Trip Level
TIME/ON5 Source Current
TIME/ON5 On-Resistance
Gate-Driver Sink/Source Current
Gate-Driver On-Resistance
CONDITIONS
MIN TYP MAX UNITS
With respect to unloaded output voltage
CSL_ driven 2% above overvoltage trip
threshold
With respect to unloaded output voltage
From each SMPS enabled, with respect to
fOSC
Typical hysteresis = 10°C
4 7 10
1.5
60 70 80
5,000 6,144 7,000
150
%
µs
%
clks
°C
With respect to unloaded output voltage,
falling edge; typical hysteresis = 1%
Falling edge, CSL_ driven 2% below RESET
trip threshold
With respect to fOSC
-7 -5.5 -4
1.5
27,000 32,000 37,000
%
µs
clks
FB3, FB5; SECFB = 2.6V
1 50 nA
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
0.6 V
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC
2.4
V
RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),
SHDN, STEER, SYNC, SEQ; VPIN = 0V or 3.3V
RESET, ISINK = 4mA
RESET = 3.5V
1
±1 µA
0.4 V
mA
SEQ = 0 or VL
TIME/ON5 = 0, SEQ = 0 or VL
TIME/ON5; RUN/ON3 = 0, SEQ = 0 or VL
DL3, DH3, DL5, DH5; forced to 2V
2.4 2.6 V
2.5 3 3.5 µA
15 80
1A
High or low (Note 6)
SSOP package
QFN package
1.5 7
1.5 8
4 _______________________________________________________________________________________

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500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS
(V+ = 15V, both PWMs on, SYNC = VL, VL load = 0, REF load = 0, SKIP = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 7)
PARAMETER
MAIN SMPS CONTROLLERS
Input Voltage Range
CONDITIONS
3V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH3 - CSL3 = 0,
CSL3 tied to FB3
3V Output Voltage in Fixed Mode
V+ = 4.2V to 30V, 0 < CSH3 - CSL3
< 80mV, FB3 = 0
5V Output Voltage in Adjustable Mode
V+ = 4.2V to 30V, CSH5 - CSL5 = 0,
CSL5 tied to FB5
5V Output Voltage in Fixed Mode
V+ = 5.3V to 30V, 0 < CSH5 - CSL5
< 80mV, FB5 = 0
Output Voltage Adjust Range
Adjustable-Mode Threshold Voltage
Current-Limit Threshold
Oscillator Frequency
Maximum Duty Factor
SYNC Input Frequency Range
FLYBACK CONTROLLER
VDD Regulation Threshold
SECFB Regulation Threshold
VDD Shunt Threshold
VDD Shunt Sink Current
12V LINEAR REGULATOR (Note 3)
12OUT Output Voltage
Quiescent VDD Current
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
VL Undervoltage Lockout-Fault Threshold
VL Switchover Threshold
REF Output Voltage
REF Load Regulation
REF Sink Current
REF Fault Lockout Voltage
V+ Operating Supply Current
Either SMPS
Dual-mode comparator
CSH3 - CSL3 or CSH5 - CSL5
SKIP = VL or VDD < 13V or SECFB < 2.44V
SYNC = VL
SYNC = 0
SYNC = VL
SYNC = 0 (Note 2)
Falling edge (Note 3)
Falling edge (MAX1901/MAX1904)
Rising edge, hysteresis = 1% (Note 3)
VDD = 20V (Note 3)
13V < VDD < 18V, 0mA < ILOAD < 100mA
VDD = 18V, run mode, no 12OUT load
SHDN = V+, RUN/ON3 = TIME/ON5 = 0,
5.4V < V+ < 30V, 0 < ILOAD < 50mA
Falling edge, hysteresis = 1%
Rising edge of CSL5, hysteresis = 1%
No external load (Note 5)
0 < ILOAD < 50µA
0 < ILOAD < 5mA
Falling edge
VL switched over to CSL5, 5V SMPS on
MIN TYP MAX UNITS
4.2
2.42
30.0
2.58
V
V
3.20 3.47 V
2.42 2.58 V
4.85 5.25 V
REF 5.5 V
0.5 1.1 V
80 120
mV
-50 -150
450 550
kHz
283 383
95
%
97
400 583 kHz
13
2.44
18
10
14
2.60
20
V
V
V
mA
11.65
12.50
100
V
µA
4.7
3.5
4.2
2.45
10
1.8
5.1
3.7
4.7
2.55
12.5
100.0
2.4
50
V
V
V
V
mV
µA
V
µA
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