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LTC3808EGN#TRPBF

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4
LTC3808
3808f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Efficiency vs Load Current Efficiency vs Load Current
Maximum Current Sense Voltage
vs I
TH
Pin Voltage
Load Step (Burst Mode
Operation)
Load Step (Forced Continuous
Mode) Load Step (Pulse Skipping Mode)
Start-Up with Internal Soft-Start
(TRACK/SS = V
IN
)
Start-Up with External Soft-Start
(C
SS
= 10nF)
T
A
= 25°C unless otherwise noted.
LOAD CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
95
85
75
65
60
1 100 1k 10
k
3808 G01
10
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.2V
FIGURE 11 CIRCUIT
SYNC/MODE = V
IN
V
IN
= 5V
LOAD CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
95
85
75
65
50
55
60
3808 G02
1 100 1k 10
k
10
FIGURE 11 CIRCUIT
V
IN
= 5V, V
OUT
= 2.5V
FORCED
CONTINUOUS
(SYNC/MODE = 0V)
PULSE SKIPPING
(SYNC/MODE = 0.6V)
BURST MODE
(SYNC/MODE =
V
IN
)
V
OUT
200mV/DIV
AC COUPLED
I
L
2A/DIV
100µs/DIV
V
IN
= 3.3V
V
OUT
= 1.8V
I
LOAD
= 300mA TO 3A
SYNC/MODE = V
IN
FIGURE 11 CIRCUIT
3808 G04
V
OUT
200mV/DIV
AC COUPLED
I
L
2A/DIV
100µs/DIV
V
IN
= 3.3V
V
OUT
= 1.8V
I
LOAD
= 300mA TO 3A
SYNC/MODE = 0V
FIGURE 11 CIRCUIT
3808 G05
V
OUT
200mV/DIV
AC COUPLED
I
L
2A/DIV
100µs/DIV
V
IN
= 3.3V
V
OUT
= 1.8V
I
LOAD
= 300mA TO 3A
SYNC/MODE = V
FB
FIGURE 11 CIRCUIT
3808 G06
V
OUT
1.8V
500mV/DIV
200µs/DIV
V
IN
= 4.2V
R
LOAD
= 1Ω
FIGURE 11 CIRCUIT
3808 G07
V
OUT
1.8V
500mV/DIV
1ms/DIV
V
IN
= 4.2V
R
LOAD
= 1Ω
FIGURE 11 CIRCUIT
3808 G08
I
TH
VOLTAGE (V)
0.5
–20
CURRENT LIMIT (%)
0
20
40
60
100
1 1.5
3808 G03
2
80
Burst Mode OPERATION
(I
TH
RISING)
Burst Mode OPERATION
(I
TH
FALLING)
FORCED CONTINUOUS
MODE
PULSE SKIPPING
MODE
5
LTC3808
3808f
Start-Up with Coincident Tracking
(V
OUT
= 0V at 0s)
Start-Up with Coincident Tracking
(V
OUT
= 0.8V at 0s)
Start-Up with Ratiometric
Tracking (V
OUT
= 0V at 0s)
Regulated Feedback Voltage vs
Temperature
Undervoltage Lockout Threshold
vs Temperature
Shutdown (RUN) Threshold vs
Temperature
Maximum Current Sense
Threshold vs Temperature
TRACK/SS Start-Up Current vs
Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
T
A
= 25°C unless otherwise noted.
V
OUT
1.8V
V
x
2.5V
500mV/DIV
10ms/DIV
V
IN
= 4.2V
R
TA
= 590Ω
R
TB
= 1.18k
FIGURE 11 CIRCUIT
3808 G09
V
OUT
1.8V
V
x
2.5V
500mV/DIV
10ms/DIV
V
IN
= 4.2V
R
TA
= 590Ω
R
TB
= 1.18k
FIGURE 11 CIRCUIT
3808 G10
V
OUT
1.8V
V
x
2.5V
500mV/DIV
10ms/DIV
V
IN
= 4.2V
R
TA
= 590Ω
R
TB
= 1.69k
FIGURE 11 CIRCUIT
3808 G11
TEMPERATURE (°C)
–60
0.594
FEEDBACK VOLTAGE (V)
0.596
0.598
0.600
0.602
–20 20
60
100
3808 G12
0.604
0.606
–40 0
40
80
TEMPERATURE (°C)
–60
2.15
2.20
2.25
INPUT VOLTAGE (V)
2.30
2.35
2.40
2.45
–20 20
60
100
3808 G13
2.50
2.55
–40 0
40
80
V
IN
RISING
V
IN
FALLING
TEMPERATURE (°C)
–60
1.00
RUN VOLTAGE (V)
1.05
–20 20
60
100
3808 G14
1.15
1.10
1.20
–40 0
40
80
TEMPERATURE (°C)
–60
115
MAXIMUM CURRENT SENSE THRESHOLD (mV)
120
125
130
–20 20
60
100
3808 G16
135
–40 0
40
80
IPRG = FLOAT
TEMPERATURE (°C)
–60
0.94
TRACK/SS START-UP CURRENT (µA)
–20 20
60
100
3808 G17
0.96
0.98
1.04
1.02
1.00
–40 0
40
80
TRACK/SS = 0V
6
LTC3808
3808f
SYNC/MODE Pull-Down Current
vs Temperature
Oscillator Frequency vs
Temperature
Oscillator Frequency vs Input
Voltage
Shutdown Quiescent Current vs
Input Voltage Sleep Current vs Input Voltage
TRACK/SS Start-Up Current vs
TRACK/SS Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
T
A
= 25°C unless otherwise noted.
TEMPERATURE (°C)
–60
2.40
2.45
2.50
SYNC/MODE PULL-DOWN CURRENT (µA)
2.55
2.60
2.65
2.70
–20 20
60
100
3808 G18
2.75
2.80
–40 0
40
80
TEMPERATURE (°C)
–60
–10
–8
–6
NORMALIZED FREQUENCY (%)
–4
–2
0
4
–20 20
60
100
3808 G19
8
2
6
10
–40 0
40
80
INPUT VOLTAGE (V)
2
–5
–4
–3
NORMALIZED FREQUENCY SHIFT (%)
–2
–1
0
2
46
8
10
3808 G20
4
1
3
5
35
7
9
INPUT VOLTAGE (V)
2
0
2
SHUTDOWN CURRENT (µA)
4
6
8
12
46
8
10
3808 G21
16
10
14
18
35
7
9
INPUT VOLTAGE (V)
2
70
SLEEP CURRENT (µA)
80
100
46
8
10
3808 G22
120
90
110
130
35
7
9
TRACK/SS VOLTAGE (V)
0
0.84
1.00
TRACK/SS STARTUP CURRENT (µA)
0.88
0.2 0.4
0.6
0.7
3808 G24
0.92
0.96
1.04
0.1 0.3
0.5
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LTC3808EGN#TRPBF

Mfr. #:
Buy LTC3808EGN#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators No RSENSE, L EMI, Sync DC/DC Cntr w/ Out
Lifecycle:
New from this manufacturer.
Delivery:
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