Datasheet

3
LTC1928-5
Note 5: CN/SHDN must be driven with a source impedance of at least
100 (R
SOURCE
) to prevent damage to the part. This pin is multiplexed
and may be connected through a low switch impedance to V
IN
. There may
be a large amount of current (V
IN
/R
SOURCE
) until the shutdown state
occurs after which the charge pump switches at CN/SHDN become high
impedance and the current will fall to <8µA.
CPO Output Resistance vs V
IN
Min and Max V
CPO
vs V
IN
V
OUT
Transient Response
Note 4: Operating conditions are limited by maximum junction
temperature. The regulated output specification will not apply for all
possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range may be
limited. When operating at maximum output current, the input voltage
range may be limited.
Shutdown to Enable Timing
(Figure 5)
Enable to Shutdown Timing
(Figure 5)
V
IN
(V)
R
CPO
()
35
30
25
20
15
10
5
2.5 3.0 3.5
19285 G01
4.0 4.5
T
A
= 25°C
C
FLY
= 0.47µF
I
OUT
= 10mA
V
IN
(V)
V
CPO
(V)
9
8
7
6
5
4
3
2.5 3.0 3.5
19285 G02
4.0 4.5
(A)
(A) THE MAXIMUM GENERATED NO LOAD
CPO VOLTAGE
(B) THE MINIMUM ALLOWABLE CPO VOLTAGE,
AT FULL LOAD, TO ENSURE THAT THE LDO
IS NOT DISABLED
(B)
V
CPO
= 1.45(V
IN
)
V
CPO
= 2(V
IN
)
T
A
= 25°C
TIME (µs)
050
V
OUT
(mV)I
OUT
(mA)
100 200150
250
300
19285 G03
10
5
0
–5
–10
15
10
5
0
T
A
= 25°C
V
IN
= 3V
V
OUT
= 5V
C
OUT
= 4.7µF
200µs/DIV
SHDN (V)V
OUT
(V)
2
0
5
4
3
2
1
0
19285 G04
T
A
= 25°C
V
IN
= 3V
V
OUT
= 5V
I
OUT
= 10mA
C
OUT
= C
CPO
= 4.7µF
1ms/DIV
SHDN (V)V
OUT
(V)
2
0
5
4
3
2
1
0
19285 G05
NO LOAD
T
A
= 25°C
V
IN
= 3V
V
OUT
= 5V
C
OUT
= 4.7µF
ELECTRICAL CHARACTERISTICS
V
OUT
Voltage vs Temperature
TEMPERATURE (°C)
–50
5.040
5.030
5.020
5.010
5.000
4.990
4.980
25 75
19285 G06
–25 0
50 100 125
V
OUT
VOLTAGE (V)
V
IN
= 3V
I
OUT
= 10mA
TYPICAL PERFOR A CE CHARACTERISTICS
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