MAX1680 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – 125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
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.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Power Efficiency
MAX1680
90
R_L = 100Ω to GND, FSEL = IN _MAX1681
80
%
ELECTRICAL CHARACTERISTICS
(Typical Operating Circuits (inverter configuration), FSEL = LV = GND, V_IN = 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF
(MAX1681), TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
Input Voltage Range
SYMBOL
V_IN
CONDITIONS
Inverter configuration,
R_L = 1kΩ, LV = GND
Doubler configuration,
R_L = 1kΩ, LV = OUT
MAX1680
MAX1681
MAX1680
MAX1681
MIN TYP MAX UNITS
2.0
5.5
3.0
5.5
V
2.5
5.5
4.0
5.5
Supply Current
MAX1680
I+
MAX1681
FSEL = IN
(125kHz)
FSEL = LV
(250kHz)
FSEL = IN
(500kHz)
FSEL = LV
(1MHz)
5.4
mA
10.8
mA
21.6
43.2
Output Voltage Under Load
(Note 2)
V_LOAD I_LOAD = 125mA
-3.75
V
Output Resistance (Note 2)
Output Resistance in
Shutdown
R_OUT
FSEL = IN or LV
R_OUT(SHUT) SHDN = IN
10
Ω
5
Ω
Shutdown Current
Input Bias Current (SHDN)
Input Bias Current (FSEL)
Shutdown, FSEL Thresholds
Switching Frequency
I+_SHDN
I_SHDN
I_FSEL
V_IL
V_IH
f_OSC
OUT = GND, SHDN = IN
LV = GND (Note 3)
MAX1680
MAX1681
-1
-1
4
FSEL = LV
157
FSEL = IN
79
FSEL = LV
570
FSEL = IN
285
1
µA
1
µA
1
µA
1
V
348
174
kHz
1490
745
Note 2: C1 and C2 are low-ESR (<0.2Ω) 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 0.2Ω 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.
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