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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1774 Datasheet

Dual / High-Efficiency / Step-Down Converter

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MAX1774 pdf
19-1810; Rev 2; 12/03
EVAALVUAAILTAIOBNLEKIT
Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
General Description
The MAX1774 is a complete power-supply solution for
PDAs and other hand-held devices. It integrates two
high-efficiency step-down converters, a boost converter
for backup battery regulation, and four voltage detec-
tors in a small 32-pin QFN or 28-pin QSOP package.
The MAX1774 accepts inputs from +2.7V to +28V and
provides an adjustable main output from 1.25V to 5.5V
at over 2A. The secondary core converter delivers an
adjustable voltage from 1V to 5V and can deliver up to
1.5A. Both the main and core regulators have separate
shutdown inputs.
When the AC adapter power is removed, an external P-
channel MOSFET switches input to the main battery.
When the main battery is low, the backup step-up con-
verter sustains the main output voltage. When the back-
up battery can no longer deliver the required load, the
system shuts down safely to prevent damage. Four on-
board voltage detectors monitor the status of the AC
adapter power, main battery, and backup battery.
The MAX1774 evaluation kit is available to help reduce
design time.
________________________Applications
Hand-Held Computers
PDAs
Internet Access Tablets
POS Terminals
Subnotebooks
Pin Configurations
TOP VIEW
GND
GND
MDRV
PGNDC
PGND
NDRV
CVL
IN
PDRV
CVH
1
2
3
4
5
6
7
8
MAX1774
24 ACO
23 INC
22 GND
21 FBC
20 CS-
19 CS+
18 FBM
17 N.C.
GND GND
Features
Dual, High-Efficiency, Synchronous-Rectified
Step-Down Converters
Thin, Small (1mm High) QFN Package
Step-Up Converter for Backup Battery
Main Power
Adjustable from +1.25V to +5.5V
Over 2A Load Current
Up to 95% Efficiency
Core Power
Adjustable from 1V to 5V
Internal Switches
Up to 1.5A Load Current
Up to 91% Efficiency
Automatic Main Battery Switchover
100% (max) Duty Cycle
Up to 1.25MHz Switching Frequency
Input Voltage Range from +2.7V to +28V
Four Low-Voltage Detectors
170µA Quiescent Current
8µA Shutdown Current
Digital Soft-Start
Independent Shutdown Inputs
Ordering Information
PART
MAX1774EEI
MAX1774EGJ
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
32 7mm x 7mm QFN
Functional Diagram
AC
ADAPTER
MAIN
BATTERY
BACKUP
BATTERY
MAX1774
MAIN (+3.3V)
CORE (+1.8V)
AC OK
LOW MAIN BATTERY
DEAD MAIN BATTERY
32 7mm x 7mm QFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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

MAX1774 Datasheet

Dual / High-Efficiency / Step-Down Converter

No Preview Available !

MAX1774 pdf
Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
ABSOLUTE MAXIMUM RATINGS
IN, SHDNM, MDRV, DBI, LBI, ACI,
CVH to GND .......................................................-0.3V to +30V
IN to CVH, PDRV ......................................................-0.3V to +6V
BIN to CS-.................................................................-0.3V to +6V
LXB to GND ................................................-0.3V to (VBIN+ 0.7V)
PDRV to GND..................................(VCVH - 0.3V) to (VIN + 0.3V)
All Other Pins to GND...............................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
32-Pin QFN (derate 23.2mW/°C above +70°C) ........1860mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
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
(Figure 1, VIN = VINS +12V, VINC = VCS- = VCS+ = +3.3V, VCORE = +1.8V, 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
18 40 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
IINC
VFBM = +1.5V, VFBC = +1.5V,
V SHDNM = V SHDNC = +3.3V
60 105 µA
Backup Mode BIN Quiescent
Supply Current
IN Shutdown Supply Current
MAIN REGULATOR
VBIN = +3.3V, CS- open
IBIN VFBM = +1.5V, V SHDNM = +3.3V,
V BKOFF = +1.5V, SHDNC = GND
SHDNM = SHDNC = GND
60 105 µA
8 40 µA
Main Output Voltage Adjust
Range
1.25 5.5 V
FBM Regulation Threshold
FBM Input Current
Current-Limit Threshold
Minimum Current-Limit
Threshold
VFBM
IFBM
V(CS+ - CS-) = 0 to +60mV,
VIN = +3.5V to +28V
VFBM = +1.3V
VCS+ - VCS-
VCS+ - VCS-
1.21
-0.1
60
5
1.25
80
15
1.29
0.1
100
25
V
µA
mV
mV
Valley Current Threshold
Zero Current Threshold
PDRV, NDRV Gate Drive
Resistance
CS- to CVL Switch Resistance
PDRV, NDRV Dead Time
VCS+ - VCS-
VCS+ - VCS-
VCS- = +3.3V, IPDRV, INDRV = 50mA
ICVL = 50mA
40 50 60 mV
0 5 15 mV
2 5.5
4.5 9.5
50
ns
2 _______________________________________________________________________________________


Part Number MAX1774
Description Dual / High-Efficiency / Step-Down Converter
Maker Maxim
Total Page 21 Pages
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