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LT3668EMSE#PBF

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LT3668
7
3668fa
For more information www.linear.com/LT3668
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Waveforms,
Burst Mode Operation
Switching Waveforms, Full
Frequency Continuous Operation EN Threshold
EN Pin Current
LDOs:
Typical Dropout Voltage
LDOs:
Tracking
LDOs:
Tracking Error
LDOs:
Tracking Error
LDOs:
Guaranteed Dropout Voltage
T
A
= 25°C, unless otherwise noted.
EN PIN VOLTAGE (V)
0
EN PIN CURRENT (µA)
0.6
0.8
1.0
15 25 40
3668 G22
0.4
0.2
0
5 10
20
30 35
3668 G19
1µs/DIV
V
SW
5V/DIV
V
OUT1
5mV/DIV
I
L
100mA/DIV
I
LOAD
= 10mA
FRONT PAGE APPLICATION, V
OUT1
= 5V
3668 G20
1µs/DIV
V
SW
5V/DIV
V
OUT1
5mV/DIV
I
L
200mA/DIV
I
LOAD
= 400mA, FRONT PAGE APPLICATION
TEMPERATURE (°C)
–50
0
THRESHOLD VOLTAGE (V)
0.1
0.3
0.4
0.5
1.0
0.7
0
50
75
3668 G21
0.2
0.8
0.9
0.6
–25 25
100
125
150
OUTPUT CURRENT (mA)
0
DROPOUT VOLTAGE (mV)
300
400
500
600
160
3668 G26
200
100
250
350
450
550
150
50
0
40
80
120
20 180
60
100
140
200
T
A
= –50°C
T
A
= 25°C
T
A
= 125°C
T
A
= 150°C
OUTPUT CURRENT (mA)
0
DROPOUT VOLTAGE (mV)
400
500
600
180160
3668 G27
300
200
0
40
80
120
20 200
60
100
140
100
800
T
J
= 125°C
T
J
= 25°C
700
= TEST POINTS
ADJ2/3 VOLTAGE (V)
0
OUT2/3 VOLTAGE (V)
8
9
10
V
IN2/3
= 11V
5 7 10
7
6
5
4
3
2
1
0
1 2 3 4 6 8 9
TEMPERATURE (°C)
50
V
OUT2/3
-V
ADJ2/3
(mV)
8
9
10
V
IN2/3
= 6V
V
ADJ2/3
= 5V
50 75 150
3668 G24
7
6
5
4
3
2
1
0
–25 0 25 100 125
V
ADJ2/3
(V)
1
V
OUT2/3
-V
ADJ2/3
(mV)
3
4
6 7 10
3668 G25
2
1
0
–1
2 43 5 8 9
LT3668
8
3668fa
For more information www.linear.com/LT3668
TYPICAL PERFORMANCE CHARACTERISTICS
ADJ2, ADJ3 Pin Bias Current
LDOs:
Internal Current Limit
LDOs:
Internal Current Limit
LDOs:
Reverse Output Current
LDOs:
Reverse Output Current
LDOs:
Input Ripple Rejection
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50
ADJ2/3 PIN BIAS CURRENT (nA)
300
350
400
25 75 150
3668 G31
250
200
150
100
–25 0
50
100 125
V
ADJ2/3
= 5V
INPUT/OUTPUT DIFFERENTIAL (V)
0
0
CURRENT LIMIT (mA)
50
150
200
250
350
5
25
35
3668 G32
100
300
20
45
10
15
30 40
T
A
= 140°C
T
A
= 125°C
T
A
= 25°C
T
A
= –50°C
OUTPUT VOLTAGE (V)
0
200
CURRENT LIMIT (mA)
225
250
275
325
5
25
35
3668 G33
300
20
45
10
15
30 40
T
A
= 140°C
T
A
= 125°C
T
A
= 25°C
T
A
= –50°C
V
IN2/3
-V
OUT2/3(NOMINAL)
= 1V
VOLTAGE (V)
0
0
CURRENT (mA)
0.4
1.2
10
20
25 45
3668 G34
0.2
0.8
1.0
0.6
5 15
30
35
40
V
IN2/3
= 0V
I
OUT2/3
I
ADJ2/3
TEMPERATURE (°C)
–50
0
CURRENT (µA)
5
15
20
25
40
35
0
50
75 150
3668 G35
10
30
–25 25
100
125
V
OUT2/3
= V
ADJ2/3
= 10V
V
IN2/3
= 0V
I
ADJ2/3
I
OUT2/3
FREQUENCY (Hz)
10 100
INPUT RIPPLE REJECTION (dB)
40
60
80
1k 10k 100k 1M 10M
3668 G36
20
0
100
120
V
IN1
= 12V
I
OUT2/3
= 200mA
V
OUT2/3
= 5V
V
IN2/3
= 6V + 50mV
RMS
RIPPLE
OUT2
OUT3
LDOs:
IN2, IN3 Quiescent Current
LDOs:
5V Quiescent Current IN2
LDOs:
5V Quiescent Current IN3/BD
TEMPERATURE (°C)
–50
0
QUIESCENT CURRENT (µA)
10
20
30
40
0 50
100
150
3668 G28
50
60
IN2
–25 25
75
125
V
IN2/3
= 6V
V
EN
= 0.3V
V
IN2/3
= 6V
V
EN
= 12V, V
IN1
= 0
V
OUT2/3
= 5V
I
LOAD
= 5µA
IN3/BD
V
IN2
(V)
0
0
QUIESCENT CURRENT I
IN2
(µA)
20
10
40
50
60
30 35 40
100
3668 G29
30
15
5
20
10
25 45
70
80
90
V
IN1
= V
EN
= 12V
V
ADJ2
= 5V
V
EN2/ILIM2
= 0V
V
EN2/ILIM2
= 2V
V
IN3/BD
(V)
0
0
QUIESCENT CURRENT I
IN3/BD
(µA)
20
10
40
50
60
100
3668 G30
30
15
5
20
10
25 30
70
80
90
V
IN1
= V
EN
= 12V
V
ADJ3
= 5V
V
EN3/ILIM3
= 0V
V
EN3/ILIM3
= 2V
LT3668
9
3668fa
For more information www.linear.com/LT3668
LDOs:
Minimum Input Voltage
LDOs:
Load Regulation
LDOs:
Output Noise Spectral Density
TEMPERATURE (°C)
–50
MINIMUM INPUT VOLTAGE (V)
0.6
1.8
2.0
2.2
0
50
75 100
3667 G37
0.2
1.4
1.0
0.4
1.6
0
1.2
0.8
–25
25
125
150
I
L
= 200mA
V
OUT2/3
= 1.1V
V
IN1
= 5V
TEMPERATURE (°C)
–50
–10
LOAD REGULATION (mV)
–4
–5
–6
–7
–8
–9
–3
–2
–1
0 50
100
150
3668 G38
0
–25 25
75
125
∆I
OUT2/3
= 1mA TO 200mA
V
OUT2/3
= 1.1V
V
IN2/3
= 2.2V
V
IN1
= 12V
FREQUENCY (Hz)
10n
OUTPUT NOISE SPECTRAL DENSITY (V/√Hz)
100n
10 1k 10k 1M100k
3668 G39
1n
100
1µ
C
OUT2/3
= 10µF
V
IN2/3
= 6V
V
ADJ2/3
= 5V
I
OUT2/3
= 200mA
TYPICAL PERFORMANCE CHARACTERISTICS
LDOs:
RMS Output Noise
LDOs:
Small Signal Transfer Function
LDOs:
Transient Response
LDOs: External Current Limit,
R
EN/ILIM
= 1.54k
LDOs: External Current Limit,
R
EN/ILIM
= 6.19k
LDOs: External Current Limit,
R
EN/ILIM
= 31.6k
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (mA)
20
OUTPUT NOISE VOLTAGE (µV
RMS
)
40
50
70
80
0.01 1 10 100
3668 G40
0
0.1
60
30
10
C
OUT
= 10µF
f
OUT2/3
= 10Hz TO 100kHz
V
IN2/3
= 6V
V
ADJ2/3
= 5V
FREQUENCY (Hz)
GAIN (dB)
–20
–10
10
20
10 1k 10k 100k 1M
3668 G41
–40
100
0
–30 –180
PHASE (°)
–90
–45
45
–225
0
–135
C
OUT
= 10µF
f
OUT2/3
= 10Hz TO 100kHz
V
IN2/3
= 6V
V
ADJ2/3
= 5V
I
OUT2/3
= 200mA
I
OUT2/3
= 20mA
PHASE
GAIN
3668 G42
100µs/DIV
V
OUT2/3
50mV/DIV
I
OUT2/3
100mA/DIV
I
OUT3/2
= 20mA
V
OUT3/2
1mV/DIV
V
IN2/3
= 6V, V
OUT2/3
= 5V
C
OUT2/3
= 10µF
I
OUT2/3
= 20mA TO 200mA
TEMPERATURE (°C)
–50
CURRENT LIMIT (mA)
190
200
150
3668 G43
180
170
0
50
100
–25
25
75
125
210
V
OUT2/3
= 5V
185
195
175
205
V
IN2/3
= 5.6V
V
IN2/3
= 15V
V
IN2/3
= 10V
TEMPERATURE (°C)
–50
CURRENT LIMIT (mA)
50.0
51.0
150
3668 G44
49.0
48.0
0
50
100
–25
25
75
125
52.0
V
OUT2/3
= 5V
49.5
50.5
48.5
51.5
V
IN2/3
= 5.6V
V
IN2/3
= 15V
V
IN2/3
= 10V
TEMPERATURE (°C)
–50
9.8
CURRENT LIMIT (mA)
9.9
10.0
10.1
10.2
–25 0 25 50
3668 G45
75 100 125 150
V
OUT2/3
= 5V
V
IN2/3
= 5.6V
V
IN2/3
= 15V
V
IN2/3
= 10V
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LT3668EMSE#PBF

Mfr. #:
Buy LT3668EMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 40V 400mA Step-Down Switching Regulator with Dual Fault Protected Tracking LDOs
Lifecycle:
New from this manufacturer.
Delivery:
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