MAX1790 Maxim, MAX1790 Datasheet - Page 2

• Manufacturer Part Number: MAX1790
• Description: Low-Noise Step-Up DC-DC Converter
• Manufacturer: Maxim

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