MAX1760 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1760 Datasheet PDF : 14 Pages
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0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued)
(CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) (Note 7)
PARAMETER
CONDITIONS
MIN
MAX UNITS
N-Channel Current Limit
REFERENCE
Reference Output Voltage
LOGIC INPUTS
IREF = 0
1.0
1.230
1.6
A
1.270
V
CLK/SEL Input Low Level
2.5V ≤ VOUT ≤ 5.5V
0.2 x
VOUT
V
CLK/SEL Input High Level
ON, ON Input Low Level (Note 6)
ON, ON Input High Level (Note 6)
Input Leakage Current
2.5V ≤ VOUT ≤ 5.5V
1.1V ≤ VOUT ≤ 1.8V
1.8V ≤ VOUT ≤ 5.5V
1.1V ≤ VOUT ≤ 1.8V
1.8V ≤ VOUT ≤ 5.5V
CLK/SEL, ON, ON
0.8 x
VOUT
VOUT + 0.2
1.6
V
0.2
V
0.4
V
1
µA
Note 1: Operating voltage—since the regulator is bootstrapped to the output, once started, the MAX1760 operates 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 (MAX1760) and ON (MAX1760H) have a hysteresis of approximately 0.15 × VOUT.
Note 7: Specifications to -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(Circuit of Figure 2, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 3.3V
100
A
90
80
70
B
60
50
C
40
30
20
10
0
0.0001
0.001
= AUTO MODE
= FPWM MODE
A: VIN = 2.4V
B: VIN = 1.2V
C: VIN = 0.9V
0.01
0.1
1
OUTPUT CURRENT (A)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V
100
90
80
BA
70
C
60
50
40
30
20
10
0
0.0001
0.001
= AUTO MODE
= FPWM MODE
A: VIN = 3.6V
B: VIN = 2.4V
C: VIN = 1.2V
0.01
0.1
1
OUTPUT CURRENT (A)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
0.9
0.8
0.7
VOUT = 3.3V
0.6
0.5
VOUT = 5V
0.4
0.3
0.2
0.1
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
INPUT VOLTAGE (V)
4 _______________________________________________________________________________________
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