ltc3827ig-1 Linear Technology Corporation, ltc3827ig-1 Datasheet - Page 4

• Manufacturer Part Number: ltc3827ig-1
• Description: Low Iq, Dual, 2-phase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC3827-1
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 LTC3827E-1 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3827I-1 is guaranteed to meet
performance specifications over the –40°C to 85°C operating temperature range.
Note 3: T
dissipation P
TYPICAL PERFOR A CE CHARACTERISTICS
4
100mV/DIV
COUPLED
T
2A/DIV
J
100
V
= T
90
80
70
60
50
40
30
20
10
OUT
0.001
0
AC
I
J
A
L
Efficiency and Power Loss
vs Output Current
FIGURE 13 CIRCUIT
is calculated from the ambient temperature T
V
V
Load Step
(Burst Mode Operation)
+ (P
FIGURE 13 CIRCUIT
V
IN
OUT
OUT
D
0.01
= 12V
according to the following formula:
D
= 3.3V
= 3.3V
• 95 °C/W)
Burst Mode OPERATION
FORCED CONTINUOUS MODE
PULSE SKIPPING MODE
0.1
LOAD CURRENT (mA)
1
20μs/DIV
10
W
100 1000 10000
U
38271 G04
38271 G01
10000
1000
100
10
0.1
1
100mV/DIV
COUPLED
A
2A/DIV
and power
V
OUT
AC
100
I
L
90
80
70
60
40
50
0.001
FIGURE 13 CIRCUIT
Load Step
(Forced Continuous Mode)
FIGURE 13 CIRCUIT
V
OUT
Efficiency vs Load Current
= 3.3V
0.01
V
V
V
IN
IN
OUT
= 12V
= 5V
0.1
LOAD CURRENT (mA)
= 3.3V
20μs/DIV
Note 4: The LTC3827-1 is tested in a feedback loop that servos V
a specified voltage and measures the resultant V
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 specified for an inductor
peak-to-peak ripple current ≥ 40% of I
considerations in the Applications Information section).
1
10
100 1000 10000
38271 G05
38271 G02
100mV/DIV
COUPLED
2A/DIV
V
98
96
94
92
90
88
86
84
82
OUT
AC
I
0
L
Efficiency vs Input Voltage
FIGURE 13 CIRCUIT
Load Step
(Pulse Skip Mode)
FIGURE 13 CIRCUIT
V
V
OUT
OUT
MAX
5
= 3.3V
= 3.3V
(see minimum on-time
10
INPUT VOLTAGE (V)
15
FB1, 2.
20μs/DIV
20
25
30
ITH1, 2
35
38271fd
38271 G06
38271 G03
to
40