800mA, Low-Noise, Step-Up DC-DC Converter
with 500mA Linear Regulator
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
OUT
= V
POUT
= V
INL
= V
ONA
= V
ONL
= 3.6V, CLK/SEL = FBL = ONB= TRACK = PGND = GND, ISET = REF (bypassed with
0.22礔), LX = open, OUTL = open (bypassed with 4.7礔), T
A
= -40癈 to +85癈, unless otherwise noted.) (Note 6)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
CONTROL INPUTS
1.1V < V
OUT
< 1.8V
0.2
O N A, O NB, O N L
( N ote 5)
1.8V < V
OUT
< 5.5V
0.4
CLK/SEL
1.2V < V
OUT
< 5.5V
0.2 ?/DIV>
V
OUT
Input Low Level
TRACK
1.2V < V
INL
< 5.5V
0.2 ?/DIV>
V
INL
V
1.1V < V
OUT
< 1.8V
V
OUT
- 0.2
O N A, O NB, O N L
( N ote 5)
1.8V < V
OUT
< 5.5V 1.6
CLK/SEL
1.2V < V
OUT
< 5.5V
0.8 ?/DIV>
V
OUT
Input High Level
TRACK
1.2V < V
INL
< 5.5V
0.8 ?/DIV>
V
INL
V
Input Leakage Current
(CLK/SEL, ONA, ONB,
ONL, TRACK)
1 糀
Internal Oscillator Frequency
CLK/SEL = OUT
0.8
1.2 MHz
Oscillator Maximum Duty Cycle
79
90 %
Note 1: Operating voltage. Since the regulator is bootstrapped to the output, once started it will operate down to 0.7V input.
Note 2: The device is in startup mode when V
OUT
is below this value (see Low-Voltage Startup Oscillatorsection). Do not apply full
load current.
Note 3: Supply current into the OUT and POUT pins. This current correlates directly to the actual battery-supply current, but is
reduced in value according to the step-up ratio and efficiency.
Note 4: Minimum recommended ISET voltage in normal mode is 0.625V.
Note 5: ONA, ONB, ONL have hysteresis of approximately 0.15
V
OUT
.
Note 6: Specifications to -40?/SPAN>C are guaranteed by design and not production tested.
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