LTC3604 Linear Technology, LTC3604 Datasheet - Page 4

• Manufacturer Part Number: LTC3604
• Description: 2.5A 15V Monolithic Synchronous Step-Down Regulator
• Manufacturer: Linear Technology

LTC3604
ELECTRICAL CHARACTERISTICS
Note 3: T
dissipation, P
where θ
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.
TYPICAL PERFORMANCE CHARACTERISTICS
T
4
A
= 25°C, V
T
100
100
J
90
80
70
60
50
40
30
20
10
80
70
60
95
90
85
75
65
= T
0
0.001
JA
4
Effi ciency vs Load Current
Burst Mode Operation
Effi ciency vs Input Voltage
Burst Mode Operation
J
A
V
= 45°C/W for the QFN package and θ
OUT
is calculated from the ambient temperature, T
+ (P
D
IN
= 1.8V
, according to the following formula:
6
D
I
I
I
I
LOAD
LOAD
LOAD
LOAD
0.01
= 12V, f
• θ
JA
LOAD CURRENT (A)
INPUT VOLTAGE (V)
= 100mA
= 500mA
= 10mA
= 2.5A
8
)
O
0.1
= 1MHz, L = 1.5μH unless otherwise noted.
10
12
1
V
V
V
IN
IN
IN
14
= 4V
= 8V
= 12V
3604 G01
3604 G04
10
16
JA
= 38°C/W for the MSOP
A
100
, and power
90
80
70
60
50
40
30
20
10
94
92
90
88
86
84
82
0.001
0
0.5
Effi ciency vs Load Current
Forced Continuous Mode
Effi ciency vs Frequency
Forced Continuous Mode
V
V
I
LOAD
OUT
OUT
= 1.8V
= 1.8V
= 800mA
1
0.01
LOAD CURRENT (A)
FREQUENCY (MHz)
1.5
L = 0.68μH
0.1
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 specifi ed maximum operating junction
temperature may impair device reliability.
L = 1.5μH
2
1
2.5
V
V
V
IN
IN
IN
= 4V
= 8V
= 12V
3604 G02
3604 G05
10
3
0.605
0.603
0.601
0.599
0.597
0.595
100
90
80
70
60
50
40
30
20
10
0
0.001
–50 –25
Effi ciency vs Load Current
Reference Voltage vs
Temperature
BURST
0.01
www.DataSheet4U.com
0
LOAD CURRENT (A)
TEMPERATURE (°C)
25
FORCED
CONTINUOUS
0.1
50
75
V
V
1
OUT
OUT
100
= 3.3V
= 5V
3604 G03
3604 G06
3604f
125
10