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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1631 Datasheet

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

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MAX1631 pdf
19-0480; Rev 3; 4/97
EVAALVUAAILTAIOBNLEKIT Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
________________General Description
The MAX1630–MAX1635 are buck-topology, step-down,
switch-mode, power-supply controllers that generate
logic-supply voltages in battery-powered systems. These
high-performance, dual/triple-output devices include on-
board power-up sequencing, power-good signaling with
delay, digital soft-start, secondary winding control, low-
dropout circuitry, internal frequency-compensation net-
works, and automatic bootstrapping.
Up to 96% 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 caused by the latest
dynamic-clock CPUs within five 300kHz 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 MAX1630–MAX1635 include two PWM regulators,
adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V
modes. All these devices include secondary feedback
regulation, and the MAX1630/MAX1632/MAX1633/
MAX1635 each contain 12V/120mA linear regulators. The
MAX1631/MAX1634 include a secondary feedback input
(SECFB), plus a control pin (STEER) that selects which
PWM (3.3V or 5V) receives the secondary feedback sig-
nal. SECFB provides a method for adjusting the sec-
ondary winding voltage regulation point with an external
resistor divider, and is intended to aid in creating auxiliary
voltages other than fixed 12V.
The MAX1630/MAX1631/MAX1632 contain internal out-
put overvoltage and undervoltage protection features.
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters
____________________________Features
o 96% 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
(MAX1631/MAX1634)
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
(MAX1630/MAX1631/MAX1632)
o Output Undervoltage Shutdown
(MAX1630/MAX1631/MAX1632)
o 200kHz/300kHz Low-Noise, Fixed-Frequency
Operation
o Low-Dropout, 99% Duty-Factor Operation
o 2.5mW Typical Quiescent Power (+12V input, both
SMPSs on)
o 4µA Typical Shutdown Current
o 28-Pin SSOP Package
_______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1630CAI
0°C to +70°C
28 SSOP
MAX1630EAI
-40°C to +85°C
28 SSOP
Ordering Information continued on last page.
________________Functional Diagram
INPUT
+5V (RTC)
5V
LINEAR
12V
LINEAR
+12V
+3.3V
3.3V
SMPS
5V
SMPS
+5V
Pin Configurations and Selector Guide appear at end of data
sheet.
Idle Mode and Dual Mode are trademarks of Maxim Integrated
Products.
ON/OFF
POWER-UP POWER-
SEQUENCE GOOD
RESET
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1631 Datasheet

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

No Preview Available !

MAX1631 pdf
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
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 +6V
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
Operating Temperature Ranges
MAX163_CAI.......................................................0°C to +70°C
MAX163_EAI ....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Continuous Power Dissipation (TA = +70°C)
SSOP (derate 9.52mW/°C above +70°C) ....................762mW
Lead Temperature (soldering, 10sec) .............................+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 = 0mA, REF load = 0mA, SKIP = 0V, TA = TMIN to TMAX, 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 = 0V,
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, 0mV < CSH3–CSL3 < 80mV,
FB3 = 0V
3.20 3.39 3.47
V
5V Output Voltage in
Adjustable Mode
V+ = 4.2V to 30V, CSH5–CSL5 = 0V,
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
Maximum Duty Factor
V+ = 5.2V to 30V, 0mV < CSH–CSL5 < 80mV,
FB5 = 0V
Either SMPS
Dual Mode comparator
Either SMPS, 0V < CSH_–CSL_ < 80mV
Either SMPS, 5.2V < V+ < 30V
CSH3–CSL3 or CSH5–CSL5
SKIP = VL or VDD < 13V or SECFB < 2.44V
SKIP = 0V, not tested
From enable to 95% full current limit with respect to
fOSC (Note 1)
SYNC = VL
SYNC = 0V
SYNC = VL
SYNC = 0V (Note 2)
4.85
REF
0.5
80
-50
10
270
170
97
98
5.13
-2
0.03
100
-100
25
512
300
200
98
99
5.25
5.5
1.1
120
-150
40
330
230
V
V
V
%
%/V
mV
mV
clks
kHz
%
2 _______________________________________________________________________________________


Part Number MAX1631
Description Multi-Output / Low-Noise Power-Supply Controllers for Notebook Computers
Maker Maxim
Total Page 28 Pages
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MAX1631 pdf
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