EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 33°C/W,
θ
JC
= 8°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3042EDD#PBF
LT3042IDD#PBF
LT3042HDD#PBF
LT3042MPDD#PBF
LT3042EMSE#PBF
LT3042IMSE#PBF
LT3042HMSE#PBF
LT3042MPMSE#PBF
TAPE AND REEL
LT3042EDD#TRPBF
LT3042IDD#TRPBF
LT3042HDD#TRPBF
LT3042MPDD#TRPBF
LT3042EMSE#TRPBF
LT3042IMSE#TRPBF
LT3042HMSE#TRPBF
LT3042MPMSE#TRPBF
http://www.linear.com/product/LT3042#orderinfo
PART MARKING*
LGSJ
LGSJ
LGSJ
LGSJ
LTGSH
LTGSH
LTGSH
LTGSH
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead (3mm
×
3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult ADI Marketing for information on nonstandard lead based finish parts.
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.
2
3042fb
For more information
www.linear.com/LT3042
LT3042
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
CONDITIONS
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
1.78
75
MAX
2
101
102
UNITS
V
mV
µA
µA
mA
Minimum IN Pin Voltage I
LOAD
= 200mA, V
IN
UVLO Rising
(Note 2)
V
IN
UVLO Hysteresis
V
IN
= 2V, I
LOAD
= 1mA, V
OUT
= 1.3V
SET Pin Current (I
SET
)
2V < V
IN
< 20V, 0V < V
OUT
< 15V, 1mA < I
LOAD
< 200mA (Note 3)
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
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
< 200mA (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 200mA, V
IN
= 2V, V
OUT
= 1.3V
I
LOAD
= 1mA to 200mA, 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
99
98
100
100
2
l
l
l
l
l
l
l
l
l
–1
–2
0.5
0.5
3
0.1
30
0.03
150
0.3
220
270
350
1.9
2
3.2
4.5
7.6
300
60
2
5
1.9
0.8
1.6
6
95
117
91
78
79
56
104
85
73
72
57
1
2
±2
±3
0.5
400
0.6
600
2
270
300
mV
mV
nA/V
µV/V
nA
mV
nA
mV
nA
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
= 150mA (Note 5)
I
LOAD
= 200mA (Note 5)
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Note 6)
I
LOAD
= 10µA
I
LOAD
= 1mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 200mA
I
LOAD
= 200mA, Frequency = 10Hz, C
OUT
= 4.7µF, C
SET
= 0.47µF, V
OUT
= 3.3V
I
LOAD
= 200mA, Frequency = 10Hz, C
OUT
= 4.7µF, C
SET
= 4.7µF, 1.3V ≤ V
OUT
≤ 15V
I
LOAD
= 200mA, Frequency = 10kHz, C
OUT
= 4.7µF, C
SET
= 0.47µF, 1.3V ≤ V
OUT
≤ 15V
I
LOAD
= 200mA, Frequency = 10kHz, C
OUT
= 4.7µF, C
SET
= 0.47µF, 0V ≤ V
OUT
< 1.3V
I
LOAD
= 200mA, BW = 10Hz to 100kHz, C
OUT
= 4.7µF, C
SET
= 0.47µF, V
OUT
= 3.3V
I
LOAD
= 200mA, BW = 10Hz to 100kHz, C
OUT
= 4.7µF, C
SET
= 4.7µF, 1.3V ≤ V
OUT
≤ 15V
I
LOAD
= 200mA, BW = 10Hz to 100kHz, C
OUT
= 4.7µF, C
SET
= 4.7µF, 0V ≤ V
OUT
< 1.3V
l
l
l
l
3.5
5
7
13
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, 15)
Ripple Rejection
0V ≤ V
OUT
< 1.3V
V
IN
– V
OUT
= 2V (Avg)
(Notes 4, 8)
EN/UV Pin Threshold
EN/UV Pin Hysteresis
EN/UV Pin Current
V
RIPPLE
= 500mV
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 4.7µF
V
RIPPLE
= 150mV
P-P
, f
RIPPLE
= 10kHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 150mV
P-P
, f
RIPPLE
= 100kHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 150mV
P-P
, f
RIPPLE
= 1MHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 80mV
P-P
, f
RIPPLE
= 10MHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 500mV
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 10kHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 100kHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 1MHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 10MHz, I
LOAD
= 200mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
EN/UV Trip Point Rising (Turn-On), V
IN
= 2V
EN/UV Trip Point Hysteresis, V
IN
= 2V
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
1.18
1.24
170
0.2
8
1.32
±1
15
V
mV
µA
µA
µA
3042fb
For more information
www.linear.com/LT3042
3
LT3042
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
CONDITIONS
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
0.3
MAX
1
10
320
250
220
55
309
UNITS
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
= 625Ω
V
IN
= 2V, V
OUT
= 0V, R
ILIM
= 2.5kΩ
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
220
130
180
45
291
270
300
180
125
200
50
300
7
25
l
l
l
30
100
1
50
mV
µA
µA
µA
µA
2
l
5
Minimum Load Required V
OUT
< 1V
(Note 13)
Thermal Shutdown
Start-Up Time
T
J
Rising
Hysteresis
V
OUT(NOM)
= 5V, I
LOAD
= 200mA, C
SET
= 0.47µF, V
IN
= 6V, V
PGFB
= 6V
V
OUT(NOM)
= 5V, I
LOAD
= 200mA, C
SET
= 4.7µF, V
IN
= 6V, V
PGFB
= 6V
V
OUT(NOM)
= 5V, I
LOAD
= 200mA, 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
162
8
55
550
10
–0.01
°C
°C
ms
ms
ms
%/W
Thermal Regulation
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.
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.
Linear Technology is unable to guarantee maximum
dropout voltage specifications at high currents due to production test
limitations with Kelvin-sensing the package pins.
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.
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 LT3042 is tested and specified under pulsed load conditions
such that T
J
≈ T
A
. The LT3042E 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 LT3042I is guaranteed
over the full –40°C to 125°C operating temperature range. The LT3042MP
is 100% tested and guaranteed over the full –55°C to 150°C operating
temperature range. The LT3042H is 100% tested at the 150°C operating
junction temperature. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
3042fb
4
For more information
www.linear.com/LT3042
LT3042
ELECTRICAL CHARACTERISTICS
Note 10:
Parasitic diodes exist internally between the 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 LT3042 requires a 10µA
minimum load current for stability.
Note 14:
Maximum OUT-to-OUTS differential is guaranteed by design.
Note 15:
The PSRR at 120Hz is guaranteed by design, characterization,
and correlation with statistical process controls.
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Electronics Design Contest
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