Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX1701 User Manual
Page 5
Input High Voltage (Note 7)
MAX1700/MAX1701
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
_______________________________________________________________________________________
5
Note 1:
Operating voltage. Since the regulator is bootstrapped to the output, once started it will operate down to 0.7V input.
Note 2:
Start-up is tested with the circuit of Figure 2.
Note 3:
In low-power mode (CLK/SEL = GND), the output voltage regulates 1% higher than low-noise mode (CLK/SEL = OUT or
synchronized).
Note 4:
The regulator is in start-up mode until this voltage is reached. Do not apply full load current.
Note 5:
Load regulation is measured from no-load to full load where full load is determined by the N-channel switch current limit.
Note 6:
Supply current from the 3.30V output is measured between the 3.30V output and 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. Set V
OUT
= 3.6V to keep the internal switch open when measuring the current into the device.
Note 7:
ONA and ONB have hysteresis of approximately 0.15xV
OUT
.
Note 8:
Specifications to -40°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(CLK/SEL = ONA = ONB = FB = PGND = GND, OUT = POUT, V
OUT
= 3.6V, MAX1701: AIN = LBN = GND, LBP = REF,
T
A
= -40°C to +85°C, unless otherwise noted.) (Note 8)
CONDITIONS
2.5V < V
OUT
< 5.5V, CLK/SEL
1.2V < V
OUT
< 5.5V, ONA and ONB
0.2V
OUT
V
0.2V
OUT
Input Low Voltage (Note 7)
1.2V < V
OUT
< 5.5V, ONA and ONB
0.8V
OUT
Input High Voltage (Note 7)
ONA, ONB, and CLK/SEL
2.5V < V
OUT
< 5.5V, CLK/SEL
µA
-1
1
Logic Input Current
V
0.8V
OUT
CLK/SEL = OUT
kHz
260
340
Internal Oscillator Frequency
UNITS
MIN
TYP
MAX
PARAMETER
%
80
92
Oscillator Maximum Duty Cycle
kHz
200
400
External Clock Frequency
Range
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
100
90
40
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
50
MAX1700-01
LOAD CURRENT (mA)
EFFICIENCY (%)
60
70
80
PFM
PWM
V
IN
= 0.9V
V
IN
= 1.2V
V
IN
= 2.4V
MAX1700-02
100
90
40
30
0.1
1
10
100
1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V)
50
LOAD CURRENT (mA)
EFFICIENCY (%)
60
70
80
V
IN
= 1.2V
V
IN
= 2.4V
V
IN
= 3.6V
PFM
PWM
0
2.0
1.0
4.0
3.0
6.0
5.0
7.0
0
2
3
1
4
5
6
MAX1701
SHUTDOWN CURRENT
vs. INPUT VOLTAGE (V)
MAX1770-03
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (
µ
A)
T = 85°C
T = 25°C
T = -40°C
LOGIC AND CONTROL INPUTS