Electrical characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX8715 User Manual
Page 3
MAX1790/MAX8715
Low-Noise Step-Up DC-DC Converters
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS
(V
IN
= SHDN = 3V, FREQ = GND,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 2)
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= SHDN = 3V, FREQ = GND,
T
A
= 0°C to +85°C
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1790
0.30
0.45
0.65
Current-Sense Transresistance
R
CS
MAX8715
0.20
0.30
0.43
V/A
SOFT-START
Reset Switch Resistance
100
Ω
Charge Current
V
SS
= 1.2V
1.5
4
7.0
µA
CONTROL INPUTS
Input Low Voltage
V
IL
SHDN, FREQ
0.3 x V
IN
V
Input High Voltage
V
IH
SHDN, FREQ
0.7 x V
IN
V
Hysteresis
SHDN, FREQ
0.1 x V
IN
V
FREQ Pulldown Current
I
FREQ
1.8
5
9.0
µA
SHDN Input Current
I
SHDN
0.001
1
µA
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply Range
V
IN
2.6
5.5
V
V
IN
Undervoltage Lockout
UVLO
V
IN
rising, typical hysteresis is 40mV,
LX remains off below this level
2.25
2.52
V
V
FB
= 1.3V, not switching
0.35
MAX1790
V
FB
= 1.0V, switching
5
V
FB
= 1.3V, not switching
0.35
Quiescent Current
I
IN
MAX8715
V
FB
= 1.0V, switching
5
mA
Shutdown Supply Current
I
IN
SHDN = GND
10
µA
ERROR AMPLIFIER
Feedback Voltage
V
FB
Level to produce V
COMP
= 1.24V
1.215
1.24
1.260
V
MAX1790
40
FB Input Bias Current
I
FB
V
FB
= 1.24V
MAX8715
190
nA
Feedback-Voltage Line
Regulation
Level to produce V
COMP
= 1.24V,
2.6V < V
IN
< 5.5V
0.15
%/V
MAX1790
70
260
Transconductance
g
m
∆I = 5µA
MAX8715
70
260
µS
OSCILLATOR
FREQ = GND
490
770
Frequency
f
OSC
FREQ = IN
900
1500
kHz
Maximum Duty Cycle
DC
FREQ = GND
78
92
%