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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1775 Datasheet

Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers

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MAX1775 pdf
19-1811; Rev 1; 8/01
EVAALVUAAILTAIOBNLEKIT
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
General Description
The MAX1775 is a dual, step-down DC-DC converter
that generates both the main (+3.3V at over 2A) and
core (+1.8V at up to 1.5A) supplies for a complete
power solution for PDAs, subnotebooks, and other
hand-held devices. The main output is adjustable from
+1.25V to +5.5V. The core output is adjustable from 1V
to 5V. Both switching converters operate at up to
1.25MHz for small external components and use syn-
chronous rectifiers to achieve efficiencies up to 95%.
Operation with up to 100% duty cycle provides the low-
est possible dropout voltage to extend useful battery
life.
The MAX1775 accepts inputs from +2.7V up to +28V,
allowing use with many popular battery configurations as
well as AC-DC wall adapters. Digital soft-start reduces
battery current surges at power-up. Both the main and
core converters have separate shutdown inputs. The
MAX1775 comes in a small 16-pin QSOP package.
The MAX1775 evaluation kit is available to help reduce
design time.
________________________Applications
Hand-Held Computers
PDAs
Internet Access Tablets
POS Terminals
Subnotebooks
Features
o Dual, High-Efficiency, Synchronous Rectified
Step-Down Converter
o Main Power
Adjustable from +1.25V to +5.5V
Over 2A Load Current
Up to 95% Efficiency
o Core Power
Adjustable from 1V to 5V
Internal Switches
Up to 1.5A Load Current
Up to 92% Efficiency
o 100% (max) Duty Cycle
o Up to 1.25MHz Switching Frequency
o Input Voltage Range from +2.7V to +28V
o 170µA Quiescent Current
o 5µA Shutdown Current
o Digital Soft-Start
o Independent Shutdown Inputs
PART
MAX1775EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 QSOP
Typical Operating Circuit
IN 2.7V TO 5.5V (28V IN CASCADE)
Pin Configuration
TOP VIEW
SHDNM 1
SHDNC 2
PGND 3
NDRV 4
CVL 5
IN 6
PDRV 7
CVH 8
MAX1775
16 LXC
15 INC
14 GND
13 FBC
12 CS-
11 CS+
10 FBM
9 REF
16 QSOP
IN CVH
ON
OFF SHDNM
INC
ON
OFF SHDNC
PDRV
NDRV
CVL
MAX1775 CS+
REF CS-
FBM
PGND
GND
LXC
FBC
MAIN
3.3V
OVER 2A
CORE
1.8V
1.5A
________________________________________________________________ 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

MAX1775 Datasheet

Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers

No Preview Available !

MAX1775 pdf
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
ABSOLUTE MAXIMUM RATINGS
IN, SHDNM, CVH to GND.......................................-0.3V to +30V
IN to CVH, PDRV ......................................................-0.3V to +6V
PDRV to GND..................................(VCVH - 0.3V) to (VIN + 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
All Other Pins to GND...............................................-0.3V to +6V
Core Output Short Circuit...........................................Continuous
Continuous Power Dissipation
16-Pin QSOP (derate 7.1mW/°C above +70°C)..........571mW
Operating Temperature .......................................-40°C to +85°C
Storage Temperature.........................................-65°C to +150°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
(VIN = +12V, VMAIN = VINC = VCS- = VCS+ = +3.3V, VCORE = +1.8V, Circuit of Figure 4, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
Input Voltage
Input Quiescent Supply Current
SYMBOL
VIN
IIN
CONDITIONS
VFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V
MIN TYP MAX UNITS
2.7 28 V
15 30 µA
CS- Quiescent Supply Current
ICS-
VFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V
110 220 µA
Core Regulator Quiescent
Supply Current
IN Shutdown Supply Current
MAIN REGULATOR
Main Output Voltage Adjust
Range
FBM Regulation Threshold
FBM Input Current
Current-Limit Threshold
Minimum Current-Limit
Threshold
IINC
VFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V
SHDNM = SHDNC = GND
60 120 µA
5 30 µA
VFBM
IFBM
VCLM
VMIN
V(CS+ - CS-) = 0 to +60mV, VIN = +2.7V to +28V
VFBM = +1.3V
VCS+ - VCS-
VCS+ - VCS-
1.25
1.21
-0.1
60
6
1.25
80
15
5.5
1.29
0.1
100
24
V
V
µA
mV
mV
Valley Current Threshold
Zero Current Threshold
PDRV, NDRV Gate Drive
Resistance
VVALLEY
VZERO
VCS+ - VCS-
VCS+ - VCS-
VCS- = +3.3V, ILOAD = 50mA
40 50 60 mV
0 15 mV
2 4.4
CS- to CVL Switch Resistance
PDRV, NDRV Dead Time
Maximum Duty Cycle
Minimum On-Time
Minimum Off-Time
ICVL = 50mA
4.5 8
50
100
200 400 650
200 400 650
ns
%
ns
ns
2 _______________________________________________________________________________________


Part Number MAX1775
Description Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers
Maker Maxim
Total Page 15 Pages
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