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MAX1790 Datasheet(PDF) 2 Page - Maxim Integrated Products

Part No. MAX1790
Description  Low-Noise Step-Up DC-DC Converter
Download  12 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1790 Datasheet(HTML) 2 Page - Maxim Integrated Products

 
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Low-Noise Step-Up DC-DC Converter
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = SHDN = 3V, FREQ = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°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.
LX to GND ..............................................................-0.3V to +14V
IN, SHDN, FREQ, FB to GND ...................................-0.3V to +6V
SS, COMP to GND .......................................-0.3V to (VIN + 0.3V)
RMS LX Pin Current ..............................................................1.2A
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) ...........330mW
Operating Temperature Range
MAX1790EUA ................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
VSS = 1.2V
VFB = 1.3V, not switching
VLX = 12V
VIN rising, typical hysteresis is 40mV,
LX remains off below this level
ILX = 1.2A
VFB = 1V, duty cycle = 65%
FREQ = IN
∆I = 5µA
FREQ = GND
FREQ = IN
Level to produce VCOMP = 1.24V,
2.6V < VIN < 5.5V
VFB = 1.24V
VFB = 1.0V, switching
SHDN = GND
FREQ = GND
Level to produce VCOMP = 1.24V
CONDITIONS
µA
1.5
4
7
Charge Current
100
Reset Switch Resistance
V/A
0.3
0.45
0.65
RCS
Current-Sense Transresistance
µA
0.01
20
ILXOFF
Leakage Current
0.21
0.5
RON
On-Resistance
A
1.2
1.6
2.3
ILIM
Current Limit (Note 1)
84
%
79
85
92
DC
Maximum Duty Cycle
1000
1220
1500
kHz
540
640
740
fOSC
Frequency
mA
0.18
0.35
IIN
Quiescent Current
V
2.25
2.38
2.52
UVLO
V
2.6
5.5
VIN
Input Supply Range
VIN Undervoltage Lockout
V/V
700
AV
Voltage Gain
µmhos
70
140
240
gm
Transconductance
%/V
0.05
0.15
Feedback-Voltage Line
Regulation
nA
040
IFB
FB Input Bias Current
25
µA
0.1
10
IIN
Shutdown Supply Current
V
1.222
1.24
1.258
VFB
Feedback Voltage
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
SHDN, FREQ
SHDN, FREQ; VIN = 2.6V to 5.5V
SHDN, FREQ; VIN = 2.6V to 5.5V
µA
0.001
1
I SHDN
SHDN Input Current
µA
1.8
5
9
IFREQ
FREQ Pull-Down Current
V
0.1
· VIN
Hysteresis
V
0.7
· VIN
VIH
Input High Voltage
V
0.3
· VIN
VIL
Input Low Voltage
ERROR AMPLIFIER
OSCILLATOR
N-CHANNEL SWITCH
SOFT-START
CONTROL INPUTS


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