LTC3835-1 Linear Technology, LTC3835-1 Datasheet - Page 4

• Manufacturer Part Number: LTC3835-1
• Description: Low IQ Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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LTC3835-1
Note 3: T
dissipation P
Note 4: The LTC3835-1 is tested in a feedback loop that servos V
specifi ed voltage and measures the resultant V
TYPICAL PERFORMANCE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
4
100mV/DIV
COUPLED
LTC3835GN-1: T
LTC3835EDHC-1: T
2A/DIV
V
100
OUT
90
80
70
60
40
30
20
10
50
AC
0.001
I
0
J
L
is calculated from the ambient temperature T
Effi ciency and Power Loss
vs Output Current
Load Step
(Burst Mode Operation)
FIGURE 10 CIRCUIT
V
OUT
D
V
V
0.01
according to the following formulas:
IN
OUT
= 3.3V
= 12V
Burst Mode OPERATION
FORCED CONTINUOUS MODE
PULSE SKIPPING MODE
= 3.3V
J
0.1
LOAD CURRENT (mA)
= T
J
= T
A
+ (P
20μs/DIV
A
1
+ (P
D
FIGURE 10 CIRCUIT
• 90°C/W)
10
D
• 43.5°C/W)
100 1000 10000
38351 G04
FB
38351 G01
.
10000
1000
100
10
0.1
1
100mV/DIV
COUPLED
A
and power
2A/DIV
V
OUT
AC
I
100
L
90
80
70
60
40
50
0.001
FIGURE 10 CIRCUIT
V
Load Step
(Forced Continuous Mode)
ITH
OUT
Effi ciency vs Load Current
= 3.3V
to a
0.01
V
V
V
IN
IN
OUT
= 12V
= 5V
0.1
LOAD CURRENT (mA)
= 3.3V
20μs/DIV
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: The minimum on-time condition is specifi ed for an inductor
peak-to-peak ripple current ≥40% of I
Considerations in the Applications Information section).
1
FIGURE 10 CIRCUIT
10
100 1000 10000
T
A
38351 G05
= 25°C, unless otherwise noted.
38351 G02
100mV/DIV
COUPLED
2A/DIV
82
98
96
94
92
90
88
86
84
V
OUT
AC
0
Effi ciency vs Input Voltage
I
L
Load Step
(Pulse-Skipping Mode)
FIGURE 10 CIRCUIT
V
OUT
MAX
5
= 3.3V
(see Minimum On-Time
10
INPUT VOLTAGE (V)
15
20ms/DIV
20
FIGURE 10 CIRCUIT
25
V
30
OUT
= 3.3V
35
38351fc
38351 G03
38351 G06
40