Rainbow Electronics MAX1760 - 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