datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1797 Datasheet

Low Supply Current / Step-Up DC-DC Converters with True-Shutdown

No Preview Available !

MAX1797 pdf
19-1798; Rev 0; 12/00
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
General Description
The MAX1795/MAX1796/MAX1797 are high efficiency
step-up DC-DC converters intended for small portable
hand-held devices. These devices feature Maxim’s
True-Shutdown™ circuitry, which fully disconnects the
output from the input in shutdown, improves efficiency,
and eliminates costly external components. All three
devices also feature Maxim’s proprietary LX-damping
circuitry for reduced EMI in noise-sensitive applica-
tions. For additional in-system flexibility, a battery moni-
toring comparator (LBI/LBO) remains active even when
the DC-DC converter is in shutdown.
The input voltage range is +0.7V to VOUT, where VOUT
can be set from +2V to +5.5V. Startup is guaranteed
from +0.85V. The MAX1795/MAX1796/MAX1797 have a
preset, pin-selectable 5V or 3.3V output. The output
can also be adjusted to other voltages, using two exter-
nal resistors. The three devices differ only in their cur-
rent limits, allowing optimization of external components
for different loads: The MAX1795, MAX1796, and
MAX1797 have current limits of 0.25A, 0.5A, and 1A,
respectively. All devices are packaged in a compact 8-
pin µMAX package that is only 1.09mm tall and half the
size of an 8-pin SO.
________________________Applications
Portable Digital Audio Players
PDAs/Palmtops
Wireless Handsets
Portable Terminals
Features
o >95% Efficiency
o True-Shutdown Circuitry
Output Disconnects from Input in Shutdown
No External Schottky Diode Needed
o 25µA Quiescent Supply Current
o Low-Noise Antiringing Feature
o LBI/LBO Comparator Enabled in Shutdown
o 2µA Shutdown Current
o 8-Pin µMAX Package
PART
MAX1795EUA
MAX1796EUA
MAX1797EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
8 µMAX
True-Shutdown is a trademark of Maxim Integrated Products.
Pin Configuration
TOP VIEW
LBI 1
FB 2
LBO 3
SHDN 4
MAX1795
MAX1796
MAX1797
µMAX
8 BATT
7 OUT
6 LX
5 GND
Typical Operating Circuit
IN
0.7V TO
5.5V
OFF
ON
BATT LX
LBI
MAX1795
MAX1796
OUT
MAX1797 FB
LBO
SHDN
GND
OUT
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1797 Datasheet

Low Supply Current / Step-Up DC-DC Converters with True-Shutdown

No Preview Available !

MAX1797 pdf
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
ABSOLUTE MAXIMUM RATINGS
OUT, LX, SHDN, LBI, LBO, BATT to GND................-0.3V to +6V
FB .............................................................-0.3V to (VOUT + 0.3V)
ILX, IOUT..............................................................................±1.5A
Output Short-Circuit Duration ...................................................5s
Continuous Power Dissipation
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-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
(VBATT = +2V, OUT = FB (VOUT = +3.3V), SHDN = LBI = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
Minimum Input Voltage
SYMBOL
CONDITIONS
After startup
MIN TYP MAX UNITS
0.7 V
Operating Voltage
Startup Voltage
Startup Voltage Tempco
Output Voltage
VBATT
(Note 1)
TA = +25°C, RL = 3k
VOUT
FB = OUT
FB = GND
1.0 5.5 V
0.85 1.0
V
-2.2 mV/°C
3.17 3.3 3.43
4.80 5.0 5.20
V
Adjustable Output Voltage
Range
2.0 5.5 V
Steady-State Output Current
IOUT
BATT = +2V,
FB = OUT
(VOUT = +3.3V)
BATT = +2V,
FB = GND
(VOUT = +5.0V)
MAX1795
MAX1796
MAX1797
MAX1795
MAX1796
MAX1797
100 180
200 300
400 550
50 120
100 200
250 370
mA
Feedback Set-Point Voltage
(Adjustable Mode)
VFB VOUT = +2V to +5.5V
1.20 1.24 1.28
V
Feedback Input Current
Internal NFET, PFET On-
Resistance
LX Switch Current Limit (NFET
only)
LX Leakage Current
IFB
RDS(ON)
ILIM
ILEAK
VFB = +1.24V
VOUT = +3.3V,
ILX = 100mA
NFET
PFET
MAX1795
MAX1796
MAX1797
VLX = 0 and +5.5V, VOUT = +5.5V
4 100 nA
0.17 0.3
0.27 0.45
0.2 0.25 0.35
0.4 0.5 0.625 A
0.8 1.0 1.25
0.2 µA
Synchronous Rectifier Turn-Off
Current Limit
25 mA
Damping Switch On-Resistance
Operating Current into OUT
(Note 2)
RDAMP
VFB = +1.4V
100 200 400
25 45
µA
2 _______________________________________________________________________________________


Part Number MAX1797
Description Low Supply Current / Step-Up DC-DC Converters with True-Shutdown
Maker Maxim
Total Page 13 Pages
PDF Download
MAX1797 pdf
MAX1797 Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 MAX1790 Low-Noise Step-Up DC-DC Converters Maxim Integrated Products
Maxim Integrated Products
MAX1790 pdf
2 MAX1791 High-Efficiency / 10-Pin MAX / Step-Down Controllers for Notebooks Maxim
Maxim
MAX1791 pdf
3 MAX1792 500mA Low-Dropout Linear Regulator in MAX Maxim
Maxim
MAX1792 pdf
4 MAX1793 Low-Dropout / Low IQ / 1A Linear Regulator Maxim
Maxim
MAX1793 pdf
5 MAX1795 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown Maxim
Maxim
MAX1795 pdf
6 MAX1796 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown Maxim
Maxim
MAX1796 pdf
7 MAX1797 Low Supply Current / Step-Up DC-DC Converters with True-Shutdown Maxim
Maxim
MAX1797 pdf
8 MAX1798 CDMA Cellular/PCS System Power Supplies Maxim
Maxim
MAX1798 pdf
9 MAX1799 CDMA Cellular/PCS System Power Supplies Maxim
Maxim
MAX1799 pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy