1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
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)
PARAMETER
LOGIC AND CONTROL INPUTS
Input Low Voltage (Note 7)
Input High Voltage (Note 7)
Input High Voltage (Note 7)
Logic Input Current
Internal Oscillator Frequency
Oscillator Maximum Duty Cycle
External Clock Frequency
Range
1.2V < V
OUT
< 5.5V, ONA and
ONB
2.5V < V
OUT
< 5.5V, CLK/SEL
1.2V < V
OUT
< 5.5V, ONA and
ONB
2.5V < V
OUT
< 5.5V, CLK/SEL
ONA,
ONB,
and CLK/SEL
CLK/SEL = OUT
0.8V
OUT
0.8V
OUT
-1
260
80
200
1
340
92
400
0.2V
OUT
0.2V
OUT
V
V
µA
kHz
%
kHz
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1700/MAX1701
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.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX1701
SHUTDOWN CURRENT
vs. INPUT VOLTAGE (V)
MAX1700-02
MAX1770-03
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
MAX1700-01
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V)
100
V
IN
= 3.6V
90
80
70
60
50
V
IN
= 1.2V
V
IN
= 2.4V
7.0
6.0
SHUTDOWN CURRENT (µA)
5.0
4.0
3.0
2.0
1.0
0
0.1
1
10
100
1000
0
1
100
90
EFFICIENCY (%)
80
70
60
50
40
0.1
1
10
100
V
IN
= 1.2V
V
IN
= 2.4V
T = 25°C
EFFICIENCY (%)
T = 85°C
V
IN
= 0.9V
PFM
PWM
1000
T = -40°C
40
30
PFM
PWM
2
3
4
5
6
LOAD CURRENT (mA)
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
