 English |
|
|
|
|
|
|
|
| LTC3826-1 Datasheet, PDF (4/32 Pages) Linear Technology – 30μA IQ, Dual, 2-Phase Synchronous Step-Down Controller | |||
| |||
| ◁ |
LTC3826-1
ELECTRICAL CHARACTERISTICS
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 LTC3826E-1 is guaranteed to meet performance speciï¬cations
from 0°C to 85°C. Speciï¬cations over the â40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3826I-1 is guaranteed to
meet performance speciï¬cations over the full â40°C to 85°C operating
temperature range.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD ⢠95 °C/W)
Note 4: The LTC3826-1 is tested in a feedback loop that servos VITH1, 2 to
a speciï¬ed voltage and measures the resultant VFB1, 2.
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 speciï¬ed for an inductor
peak-to-peak ripple current â¥40% of IMAX (see minimum on-time
considerations in the Applications Information section).
TYPICAL PERFORMANCE CHARACTERISTICS
Efï¬ciency and Power Loss
vs Output Current
100
Burst Mode OPERATION
90
FORCED CONTINUOUS MODE
PULSE SKIPPING
80
MODE
70
10000
1000
60
100
50
40
10
30
20
1
10
0
0.00001 0.0001 0.001 0.01
VIN = 12V
VOUT = 3.3V 0.1
0.1 1 10
OUTPUT CURRENT (A)
FIGURE 13 CIRCUIT
38261 G01
Efï¬ciency vs Load Current
100
90
80
70
60
50
40
30
20
10
0
0.00001 0.0001 0.001 0.01
VIN = 12V
VIN = 5V
VOUT = 3.3V
0.1 1 10
OUTPUT CURRENT (A)
FIGURE 13 CIRCUIT
38261 G02
Efï¬ciency vs Input Voltage
98
96
94
92
90
88
86
84
82
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
38261 G03
Load Step
(Burst Mode Operation)
VOUT
100mV/DIV
AC
COUPLED
Load Step
(Forced Continuous Mode)
VOUT
100mV/DIV
AC
COUPLED
Load Step
(Pulse Skipping Mode)
VOUT
100mV/DIV
AC
COUPLED
IL
2A/DIV
IL
2A/DIV
IL
2A/DIV
20μs/DIV
FIGURE 13 CIRCUIT
VOUT = 3.3V
38261 G04
20μs/DIV
FIGURE 13 CIRCUIT
VOUT = 3.3V
38261 G05
20μs/DIV
FIGURE 13 CIRCUIT
VOUT = 3.3V
38261 G06
38261fb
4
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese