Electrical characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX1681 User Manual
Page 3
mA
ELECTRICAL CHARACTERISTICS
(
Typical Operating Circuits
(inverter configuration), FSEL = LV = GND, V
IN
= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF
(MAX1681),
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 4)
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
_______________________________________________________________________________________
3
FSEL = IN
FSEL = LV
MAX1681
I
LOAD
= 125mA
21.6
mA
Inverter configuration,
R
L
= 1k
Ω
, LV = GND
43.2
Doubler configuration,
R
L
= 1k
Ω
, LV = OUT
MAX1681
FSEL = LV
FSEL = IN
MAX1680
LV = GND (Note 3)
FSEL = IN or LV
SHDN = IN
OUT = GND, SHDN = IN
CONDITIONS
I+
FSEL = IN
(500kHz)
Supply Current
FSEL = LV
(1MHz)
kHz
285
745
f
OSC
570
1490
79
174
157
348
Switching Frequency
4
V
IH
V
-3.75
V
LOAD
Output Voltage Under Load
(Note 2)
3.0
5.5
V
2.0
5.5
4.0
5.5
V
IN
V
-1
1
V
IL
Shutdown, FSEL Thresholds
µA
-1
1
I
FSEL
Input Bias Current (FSEL)
Ω
10
R
OUT
Output Resistance (Note 2)
Ω
5
R
OUT(SHUT)
Output Resistance in
Shutdown
µA
1
I+
SHDN
Shutdown Current
µA
1
I
SHDN
Input Bias Current (SHDN)
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX1681
MAX1680
2.5
5.5
Input Voltage Range
MAX1681
MAX1680
MAX1680
5.4
10.8
FSEL = IN
(125kHz)
FSEL = LV
(250kHz)
ELECTRICAL CHARACTERISTICS (continued)
(
Typical Operating Circuits
(inverter configuration), FSEL = LV = GND, V
IN
= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF
(MAX1681),
T
A
= 0°C to +85°C
, unless otherwise noted. Typical values are at T
A
= +25°C.)
Note 2:
C1 and C2 are low-ESR (<0.2
Ω
) capacitors. Capacitor ESR adds to the circuit’s output resistance. Using capacitors with
higher ESR reduces output voltage and efficiency. The specified output resistance includes the C1 and C2 0.2
Ω
ESR.
Note 3:
The typical threshold for V
INPUT
other than +5V is 0.35V
INPUT
(V
IL
= V
IH
).
Note 4:
Specifications to -40°C are guaranteed by design, not production tested.
R
L
= 100
Ω
to GND, FSEL = IN
MAX1680
MAX1681
%
80
90
Power Efficiency
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
CONDITIONS