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PDF MAX1901ETJ Data sheet ( Hoja de datos )
| Número de pieza | MAX1901ETJ | |
| Descripción | 500kHz Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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.
1 page  
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
_______________________________________________________________________________________ 5
5 Page 
500kHz Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
INPUT
7V TO 24V
C3
5V OUTPUT
R1
C1 *
C4
0.1µF
L1
Q1
Q2
5V ON/OFF
3.3V ON/OFF
ON/OFF
10Ω
4.7µF
0.1µF
0.1µF
V+ SHDN SECFB VL
SYNC
BST5 BST3
DH5 DH3
LX5 LX3
DL5 MAX1901
MAX1904 DL3
PGND
GND
CSH5
CSL5
CSH3
CSL3
FB3
FB5
TIME/ON5
RUN/ON3
RESET
SKIP
STEER
REF SEQ
1µF
Figure 1. Standard 3.3V/5V Application Circuit (MAX1901/MAX1904)
0.1µF
5V ALWAYS ON
4.7µF
0.1µF
Q3
C5
0.1µF
L2
Q4
R2 3.3V OUTPUT
* C2
RESET OUTPUT
2.5V ALWAYS ON
*1A SCHOTTKY DIODE REQUIRED
FOR THE MAX1901 (SEE THE OUTPUT
OVERVOLTAGE PROTECTION SECTION).
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 33 Páginas | |
| PDF Descargar | [ Datasheet MAX1901ETJ.PDF ] | |
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