Datasheet
LT3045
3
Rev. B
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range
l
2 20 V
Minimum IN Pin Voltage
(Note 2)
I
LOAD
= 500mA, V
IN
UVLO Rising
V
IN
UVLO Hysteresis
l
1.78
75
2 V
mV
Output V
oltage Range V
IN
> V
OUT
l
0 15 V
SET Pin Current (I
SET
) V
IN
= 2V, I
LOAD
= 1mA, V
OUT
= 1.3V
2V < V
IN
< 20V, 0V < V
OUT
< 15V, 1mA < I
LOAD
< 500mA (Note 3)
l
99
98
100
100
101
102
µA
µA
Fast Start-Up Set Pin
Current
V
PGFB
= 289mV, V
IN
= 2.8V, V
SET
= 1.3V 2 mA
Output Offset Voltage
V
OS
(V
OUT
– V
SET
)
(Note 4)
V
IN
= 2V, I
LOAD
= 1mA, V
OUT
= 1.3V
2V < V
IN
< 20V, 0V < V
OUT
< 15V, 1mA < I
LOAD
< 500mA (Note 3)
l
–1
–2
1
2
mV
mV
Line Regulation
: ∆I
SET
Line Regulation: ∆V
OS
V
IN
= 2V to 20V, I
LOAD
= 1mA, V
OUT
= 1.3V
V
IN
= 2V to 20V, I
LOAD
= 1mA, V
OUT
= 1.3V (Note 4)
l
l
0.5
0.5
±
2
±3
nA/V
µV/V
Load Regulation: ∆I
SET
Load Regulation: ∆V
OS
I
LOAD
= 1mA to 500mA, V
IN
= 2V, V
OUT
= 1.3V
I
LOAD
= 1mA to 500mA, V
IN
= 2V, V
OUT
= 1.3V (Note 4)
l
3
0.1
0.5
nA
mV
Change in I
SET
with V
SET
Change in V
OS
with V
SET
Change in I
SET
with V
SET
Change in V
OS
with V
SET
V
SET
= 1.3V to 15V, V
IN
= 20V, I
LOAD
= 1mA
V
SET
= 1.3V to 15V, V
IN
= 20V, I
LOAD
= 1mA (Note 4)
V
SET
= 0V to 1.3V, V
IN
= 20V, I
LOAD
= 1mA
V
SET
= 0V to 1.3V, V
IN
= 20V, I
LOAD
= 1mA (Note 4)
l
l
l
l
30
0.03
150
0.3
400
0.6
600
2
nA
mV
nA
mV
Dropout V
oltage I
LOAD
= 1mA, 50mA
l
220 275
330
mV
mV
I
LOAD
= 300mA (Note 5)
l
220 280
350
mV
mV
I
LOAD
= 500mA (Note 5)
l
260 350
450
mV
mV
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Note 6)
I
LOAD
= 10µA
I
LOAD
= 1mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 500mA
l
l
l
l
2.2
2.4
3.5
4.3
15
4
5.5
7
25
mA
mA
mA
mA
mA
Output Noise Spectral
Density (Notes 4, 8)
I
LOAD
= 500mA, Frequency = 10Hz, C
OUT
= 10µF, C
SET
= 0.47µF, V
OUT
= 3.3V
I
LOAD
= 500mA, Frequency = 10Hz, C
OUT
= 10µF, C
SET
= 4.7µF, 1.3V ≤ V
OUT
≤ 15V
I
LOAD
= 500mA, Frequency = 10kHz, C
OUT
= 10µF, C
SET
= 0.47µF, 1.3V ≤ V
OUT
≤ 15V
I
LOAD
= 500mA, Frequency = 10kHz, C
OUT
= 10µF, C
SET
= 0.47µF, 0V ≤ V
OUT
< 1.3V
500
70
2
5
nV/√Hz
nV/√
Hz
nV/√
Hz
nV/√
Hz
Output RMS Noise
(Notes 4, 8)
I
LOAD
= 500mA, BW = 10Hz to 100kHz, C
OUT
= 10µF, C
SET
= 0.47µF, V
OUT
= 3.3V
I
LOAD
= 500mA, BW = 10Hz to 100kHz, C
OUT
= 10µF, C
SET
= 4.7µF, 1.3V ≤ V
OUT
≤ 15V
I
LOAD
= 500mA, BW = 10Hz to 100kHz, C
OUT
= 10µF, C
SET
= 4.7µF, 0V ≤ V
OUT
< 1.3V
2.5
0.8
1.8
µV
RMS
µV
RMS
µV
RMS
Reference Current RMS
Output Noise (Notes 4, 8)
BW = 10Hz to 100kHz 6 nA
RMS
Ripple Rejection
1.3V ≤ V
OUT
≤ 15V
V
IN
– V
OUT
= 2V (Avg)
(Notes 4, 8)
V
RIPPLE
= 500mV
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 4.7µF
V
RIPPLE
= 150mV
P-P
, f
RIPPLE
= 10kHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
V
RIPPLE
= 150mV
P-P
, f
RIPPLE
= 100kHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
V
RIPPLE
= 150mV
P-P
, f
RIPPLE
= 1MHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
V
RIPPLE
= 80mV
P-P
, f
RIPPLE
= 10MHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
117
90
77
76
53
dB
dB
dB
dB
dB
Ripple Rejection
0V ≤ V
OUT
< 1.3V
V
IN
– V
OUT
= 2V (Avg)
(Notes 4, 8)
V
RIPPLE
= 500mV
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 10kHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 100kHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 1MHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 10MHz, I
LOAD
= 500mA, C
OUT
= 10µF, C
SET
= 0.47µF
104
85
72
64
54
dB
dB
dB
dB
dB
EN/UV Pin Threshold EN/UV Trip Point Rising (Turn-On), V
IN
= 2V
l
1.18 1.24 1.32 V
EN/UV Pin Hysteresis EN/UV Trip Point Hysteresis, V
IN
= 2V 130 mV
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