EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 33°C/W,
θ
JC
= 8°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3045EDD-1#PBF
LT3045IDD-1#PBF
LT3045EMSE-1#PBF
LT3045IMSE-1#PBF
TAPE AND REEL
LT3045EDD-1#TRPBF
LT3045IDD-1#TRPBF
LT3045EMSE-1#TRPBF
LT3045IMSE-1#TRPBF
http://www.linear.com/product/LT3045-1#orderinfo
PART MARKING*
LHBR
LHBR
30451
30451
PACKAGE DESCRIPTION
12-Lead (3mm
×
3mm) Plastic DFN
12-Lead (3mm
×
3mm) Plastic DFN
12-Lead Plastic MSOP
12-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
LT3045 Options
PART NUMBER
LT3045-1
LT3045
VIOC FUNCTION
Yes
No
30451fa
2
For more information
www.linear.com/LT3045-1
LT3045-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Input Voltage Range
Minimum IN Pin Voltage I
LOAD
= 500mA, V
IN
UVLO Rising
V
IN
UVLO Hysteresis
(Note 2)
Output Voltage Range
V
IN
> V
OUT
SET Pin Current (I
SET
)
Fast Start-Up Set Pin
Current
Output Offset Voltage
V
OS
(V
OUT
– V
SET
)
(Note 4)
Line Regulation: ∆I
SET
Line Regulation: ∆V
OS
Load Regulation: ∆I
SET
Load Regulation: ∆V
OS
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
Dropout Voltage
(Note 5)
V
IN
= 2V, I
LOAD
= 1mA, V
OUT
= 1.3V
2V < V
IN
< 20V, 0V < V
OUT
< 15V, 1mA < I
LOAD
< 500mA (Note 3)
V
PGFB
= 289mV, V
IN
= 2.8V, V
SET
= 1.3V
V
IN
= 2V, I
LOAD
= 1mA, V
OUT
= 1.3V
2V < V
IN
< 20V, 0V < V
OUT
< 15V, 1mA < I
LOAD
< 500mA (Note 3)
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)
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)
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)
I
LOAD
= 1mA, 50mA
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l
l
l
l
TYP
1.78
75
MAX
20
2
15
UNITS
V
V
mV
V
µA
µA
mA
2
0
99
98
100
100
2
–1
–2
0.5
0.5
3
0.1
30
0.03
150
0.3
220
220
101
102
l
l
l
l
l
l
l
l
1
2
±2
±3
0.5
400
0.6
600
2
275
330
280
350
350
450
4
5.5
7
25
mV
mV
nA/V
µV/V
nA
mV
nA
mV
nA
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
µV
RMS
µV
RMS
µV
RMS
nA
RMS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
I
LOAD
= 300mA
l
I
LOAD
= 500mA
l
260
2.2
2.4
3.5
4.3
15
500
70
2
5
2.5
0.8
1.8
6
117
90
77
76
53
104
85
72
64
54
l
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
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
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
l
l
l
l
Output Noise Spectral
Density (Notes 4, 8)
Output RMS Noise
(Notes 4, 8)
Reference Current RMS BW = 10Hz to 100kHz
Output Noise (Notes 4, 8)
Ripple Rejection
1.3V ≤ V
OUT
≤ 15V
V
IN
– V
OUT
= 2V (Avg)
(Notes 4, 8)
Ripple Rejection
0V ≤ V
OUT
< 1.3V
V
IN
– V
OUT
= 2V (Avg)
(Notes 4, 8)
EN/UV Pin Threshold
EN/UV Pin Hysteresis
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
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
EN/UV Trip Point Rising (Turn-On), V
IN
= 2V
EN/UV Trip Point Hysteresis, V
IN
= 2V
1.18
1.24
130
1.32
V
mV
30451fa
For more information
www.linear.com/LT3045-1
3
LT3045-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
EN/UV Pin Current
CONDITIONS
V
EN/UV
= 0V, V
IN
= 20V
V
EN/UV
= 1.24V, V
IN
= 20V
V
EN/UV
= 20V, V
IN
= 0V
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
0.03
8
0.3
MAX
±1
15
1
10
850
430
550
110
309
UNITS
µA
µA
µA
µA
µA
mA
mA
mA
mA • kΩ
mA
mA
mV
mV
nA
Quiescent Current in
V
IN
= 6V
Shutdown (V
EN/UV
= 0V)
Internal Current Limit
(Note 12)
Programmable
Current Limit
PGFB Trip Point
PGFB Hysteresis
PGFB Pin Current
PG Output Low Voltage
PG Leakage Current
Reverse Input Current
Reverse Output Current
V
IN
= 2V, V
OUT
= 0V
V
IN
= 12V, V
OUT
= 0V
V
IN
= 20V, V
OUT
= 0V
Programming Scale Factor: 2V < V
IN
< 20V (Note 11)
V
IN
= 2V, V
OUT
= 0V, R
ILIM
= 300Ω
V
IN
= 2V, V
OUT
= 0V, R
ILIM
= 1.5kΩ
PGFB Trip Point Rising
PGFB Trip Point Hysteresis
V
IN
= 2V, V
PGFB
= 300mV
I
PG
= 100µA
V
PG
= 20V
V
IN
= –20V, V
EN/UV
= 0V, V
OUT
= 0V, V
SET
= 0V
V
IN
= 0, V
OUT
= 5V, SET = Open
570
230
450
90
291
710
700
330
150
500
100
300
7
25
l
l
l
30
100
1
100
mV
µA
µA
µA
µA
14
l
25
Minimum Load Required V
OUT
< 1V
(Note 13)
Thermal Shutdown
Start-Up Time
T
J
Rising
Hysteresis
V
OUT(NOM)
= 5V, I
LOAD
= 500mA, C
SET
= 0.47µF, V
IN
= 6V, V
PGFB
= 6V
V
OUT(NOM)
= 5V, I
LOAD
= 500mA, C
SET
= 4.7µF, V
IN
= 6V, V
PGFB
= 6V
V
OUT(NOM)
= 5V, I
LOAD
= 500mA, C
SET
= 4.7µF, V
IN
= 6V, R
PG1
= 50kΩ,
R
PG2
= 700kΩ (with Fast Start-Up to 90% of V
OUT
)
10ms Pulse
10
165
8
55
550
10
–0.01
1
°C
°C
ms
ms
ms
%/W
V/V
4
V
V
µA
15
µA
Thermal Regulation
VIOC Amplifier Gain
Input-to-Output
Differential Voltage
VIOC Pin Voltage Range: V
OUT
> V
VIOC
+ 0.5V
Control (VIOC) (Note 15)
VIOC Pin Voltage: V
OUT
≤ 1.5V, V
IN
= 2.5V
VIOC Pin Source Current
VIOC Pin Sink Current: V
IN
≥ 2.5V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The EN/UV pin threshold must be met to ensure device operation.
Note 3:
Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current, especially due to the
internal current limit foldback which starts to decrease current limit at
V
IN
– V
OUT
> 12V. If operating at maximum output current, limit the input
voltage range. If operating at the maximum input voltage, limit the output
current range.
l
1
1
200
l
l
Note 4:
OUTS ties directly to OUT.
Note 5:
Dropout voltage is the minimum input-to-output differential
voltage needed to maintain regulation at a specified output current. The
dropout voltage is measured when output is 1% out of regulation. This
definition results in a higher dropout voltage compared to hard dropout —
which is measured when V
IN
= V
OUT(NOMINAL)
. For lower output voltages,
below 1.5V, dropout voltage is limited by the minimum input voltage
specification. Please consult the Typical Performance Characteristics
for curves of dropout voltage as a function of output load current and
temperature measured in a typical application circuit.
4
30451fa
For more information
www.linear.com/LT3045-1
LT3045-1
ELECTRICAL CHARACTERISTICS
Note 6:
GND pin current is tested with V
IN
= V
OUT(NOMINAL)
and a current
source load. Therefore, the device is tested while operating in dropout. This
is the worst-case GND pin current. GND pin current decreases at higher
input voltages. Note that GND pin current does not include SET pin or ILIM
pin current but Quiescent current does include them.
Note 7:
SET and OUTS pins are clamped using diodes and two 25Ω series
resistors. For less than 5ms transients, this clamp circuitry can carry
more than the rated current. Refer to Applications Information for more
information.
Note 8:
Adding a capacitor across the SET pin resistor decreases output
voltage noise. Adding this capacitor bypasses the SET pin resistor’s
thermal noise as well as the reference current’s noise. The output noise
then equals the error amplifier noise. Use of a SET pin bypass capacitor
also increases start-up time.
Note 9:
The LT3045-1 is tested and specified under pulsed load conditions
such that T
J
≈ T
A
. The LT3045-1E is 100% tested at 25°C and performance
is guaranteed from 0°C to 125°C. Specifications over the –40°C to 125°C
operating temperature range are assured by design, characterization, and
correlation with statistical process controls. The LT3045-1I is guaranteed
over the full –40°C to 125°C operating temperature range. High junction
temperatures degrade operating lifetimes. Operating lifetime is derated at
junction temperatures greater than 125°C.
Note 10:
Parasitic diodes exist internally between the VIOC, ILIM, PG,
PGFB, SET, OUTS, and OUT pins and the GND pin. Do not drive these pins
more than 0.3V below the GND pin during a fault condition. These pins
must remain at a voltage more positive than GND during normal operation.
Note 11:
The current limit programming scale factor is specified while the
internal backup current limit is not active. Note that the internal current
limit has foldback protection for V
IN
– V
OUT
differentials greater than 12V.
Note 12:
The internal back-up current limit circuitry incorporates foldback
protection that decreases current limit for V
IN
– V
OUT
> 12V. Some level of
output current is provided at all V
IN
– V
OUT
differential voltages. Consult the
Typical Performance Characteristics graph for current limit vs V
IN
– V
OUT
.
Note 13:
For output voltages less than 1V, the LT3045-1 requires a 10µA
minimum load current for stability.
Note 14:
Maximum OUT-to-OUTS differential is guaranteed by design.
Note 15:
The VIOC buffer outputs a voltage equal to V
IN
– V
OUT
or
V
IN
– 1.5V (for V
OUT
≤ 1.5V). See Block Diagram and Applications
Information for further information. The VIOC pin’s source current should
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