Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX1760 User Manual
Page 4
MAX1760
0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
4
_______________________________________________________________________________________
Note 1: Operating voltage—since the regulator is bootstrapped to the output, once started the MAX1760 will operate down
to 0.7V input.
Note 2: Startup is tested with the circuit shown in Figure 6.
Note 3: Defines maximum step-up ratio.
Note 4: The regulator is in startup mode until this voltage is reached. Do not apply full load current until the output exceeds 2.3V.
Note 5: Supply current into the OUT pin. This current correlates directly to the actual battery-supply current, but is reduced in
value according to the step-up ratio and efficiency.
Note 6: ON has a hysteresis of approximately 0.15
×
V
OUT
.
Note 7: Specifications to -40°C are guaranteed by design and not production tested.
100
0
0.0001
0.001
0.01
0.1
1
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 3.3V
20
MAX1760 toc01
OUTPUT CURRENT (A)
EFFICIENCY (%)
40
70
90
60
80
10
30
50
A
B
C
A: V
IN
= 2.4V
B: V
IN
= 1.2V
C: V
IN
= 0.9V
= AUTO MODE
= FPWM MODE
MAX1760-02
100
0
0.0001
0.001
0.01
0.1
1
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 5V
20
OUTPUT CURRENT (A)
EFFICIENCY (%)
40
70
90
60
80
10
30
50
A: V
IN
= 3.6V
B: V
IN
= 2.4V
C: V
IN
= 1.2V
= AUTO MODE
= FPWM MODE
A
B
C
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1760-03
0.1
1.0
0.5
1.5
2.0
2.5
3.0
3.5
4.0
0.3
0.2
0.5
0.4
0.8
0.7
0.6
0.9
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
V
OUT
= 3.3V
V
OUT
= 5V
ELECTRICAL CHARACTERISTICS (continued)
(CLK/SEL = ON = FB = PGND = GND, ISET = REF, OUT = POUT, V
OUT
= 3.6V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 7)
Typical Operating Characteristics
(Circuit of Figure 2, V
IN
= 2.4V, V
OUT
= 3.3V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
LOGIC INPUTS
CLK/SEL Input Low Level
2.5V
≤ V
OUT
≤ 5.5V
(0.2)V
OUT
V
CLK/SEL Input High Level
2.5V
≤ V
OUT
≤ 5.5V
(0.8)V
OUT
V
1.1V
≤ V
OUT
≤ 1.8V
0.2
ON Input Low Level (Note 6)
1.8V
≤ V
OUT
≤ 5.5V
0.4
V
1.1V
≤ V
OUT
≤ 1.8V
V
OUT
+ 0.2
ON Input High Level (Note 6)
1.8V
≤ V
OUT
≤ 5.5V
1.6
V
Input Leakage Current
CLK/SEL, ON
1
µA