LTC3604
4
3604fa
For more information www.linear.com/LTC3604
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
Burst Mode Operation
Efficiency vs Load Current
Forced Continuous Mode
Efficiency vs Frequency
Forced Continuous Mode
Reference Voltage vs
Temperature
ELECTRICAL CHARACTERISTICS
Efficiency vs Input Voltage
Burst Mode Operation
Efficiency vs Load Current
T
A
= 25°C, V
IN
= 12V, f
O
= 1MHz, L = 1.5µH unless otherwise noted.
TEMPERATURE (°C)
–50 –25
0.595
V
REF
(V)
0.599
0.605
0
50
75
0.597
0.603
0.601
25
100
125
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.001 0.1 1 10
3604 G01
0
0.01
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
V
OUT
= 1.8V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.001 0.1 1 10
3604 G02
0
0.01
V
IN
= 4V
V
IN
= 8V
V
IN
= 12V
V
OUT
= 1.8V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.001 0.1 1 10
3604 G03
0
0.01
V
OUT
= 3.3V
V
OUT
= 5V
BURST
FORCED
CONTINUOUS
INPUT VOLTAGE (V)
4
EFFICIENCY (%)
75
80
85
10
14
70
65
60
6 8 12
90
95
100
16
I
LOAD
= 500mA
I
LOAD
= 100mA
I
LOAD
= 10mA
I
LOAD
= 2.5A
FREQUENCY (MHz)
0.5
82
EFFICIENCY (%)
84
86
88
90
92
94
1 1.5 2 2.5
3
V
OUT
= 1.8V
I
LOAD
= 800mA
L = 1.5µH
L = 0.68µH
Note 3: T
J
is calculated from the ambient temperature, T
A
, and power
dissipation, P
D
, according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
)
where θ
JA
= 45°C/W for the QFN package and θ
JA
= 38°C/W for the MSOP
package.
Note 4: Maximum allowed current draw when used as a regulated output
is 5mA. This supply is only intended to provide additional DC load current
as needed and not intended to regulate large transient or AC behavior as
these waveforms may impact LTC3604 operation.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
