Max1790 low-noise step-up dc-dc converter, Electrical characteristics – Rainbow Electronics MAX1790 User Manual
Page 3
MAX1790
Low-Noise Step-Up DC-DC Converter
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS
(V
IN
= SHDN = 3V, FREQ = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
Note 1: Current limit varies with duty cycle due to slope compensation. See the Output Current Capability section.
Note 2: Specifications to -40°C are guaranteed by design and not production tested.
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Feedback Voltage
V
FB
1.215
1.26
V
Shutdown Supply Current
I
IN
10
µA
4
5
FB Input Bias Current
I
FB
40
nA
Feedback-Voltage Line
Regulation
0.15
%/V
Transconductance
g
m
70
260
µmhos
V
IN
Undervoltage Lockout
Input Supply Range
V
IN
2.6
5.5
V
UVLO
2.25
2.52
V
Quiescent Current
I
IN
0.2
0.35
mA
Frequency
f
OSC
490
770
kHz
900
1500
Maximum Duty Cycle
DC
78
92
%
Current Limit
I
LIM
1.2
2.3
A
On-Resistance
R
ON
0.5
Ω
Current-Sense Transresistance
R
CS
0.3
0.65
V/A
Input Low Voltage
V
IL
0.3
·
V
IN
V
Input High Voltage
V
IH
0.7
·
V
IN
V
CONDITIONS
FREQ = GND
Level to produce V
COMP
= 1.24V
FREQ = IN
SHDN = GND
V
FB
= 1.0V, switching
V
FB
= 1.24V
Level to produce V
COMP
= 1.24V,
2.6V < V
IN
< 5.5V
FREQ = GND
∆I = 5µA
V
FB
= 1V, duty cycle = 65%
I
LX
= 1.2A
V
IN
rising, typical hysteresis is 40mV,
LX remains off below this level
SHDN, FREQ, V
IN
= 2.6V to 5.5V
SHDN, FREQ, V
IN
= 2.6V to 5.5V
V
FB
= 1.3V, not switching
ERROR AMPLIFIER
OSCILLATOR
N-CHANNEL SWITCH
CONTROL INPUTS