LTC3407-3 Linear Technology, LTC3407-3 Datasheet - Page 3

• Manufacturer Part Number: LTC3407-3
• Description: Dual Synchronous 1.8V/0.8A and 3.3V/0.8A 2.25MHz Step-Down DC/DC Regulator
• Manufacturer: Linear Technology

200mV/DIV
500mA/DIV
500mA/DIV
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. No pin shall exceed 6V.
Note 2: The LTC3407E-3 is guaranteed to meet specified performance
from 0°C to 85°C. Specifications over the – 40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
200mA/DIV
ELECTRICAL CHARACTERISTICS
TYPICAL PERFOR A CE CHARACTERISTICS
20mV/DIV
5V/DIV
I
V
V
LOAD
OUT
OUT
SW
I
I
L
L
Burst Mode Operation
V
V
I
Load Step
V
V
I
CIRCUIT OF FIGURE 1
LOAD
LOAD
IN
OUT
IN
OUT
= 3.6V
= 5V
= 1.8V
= 3.3V
= 100mA
= 80mA TO 800mA
2µs/DIV
20µs/DIV
W
34073 G04
34073 G01
U
200mA/DIV
20mV/DIV
5V/DIV
V
OUT
SW
2.5
2.4
2.3
2.2
2.1
2.0
I
L
–50
Oscillator Frequency vs
Temperature
Pulse Skipping Mode
V
V
I
LOAD
V
IN
OUT
IN
= 3.6V
–25
= 3.6V
= 1.8V
= 20mA
0
TEMPERATURE (°C)
25
1µs/DIV
Note 3: The LTC3407-3 is tested in a proprietary test mode that connects
the output of the error amplifier to an outside servo loop.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T
according to the following formula: T
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
50
75
J
is calculated from the ambient T
100
34073 G05
T
34073 G02
A
= 25°C unless other wise specified.
125
200mV/DIV
500mA/DIV
500mA/DIV
I
V
LOAD
–10
OUT
– 2
– 4
– 6
– 8
10
I
8
6
4
2
0
L
2
Oscillator Frequency Deviation
vs Supply Voltage
V
V
I
CIRCUIT OF FIGURE 1
Load Step
LOAD
IN
OUT
J
= T
= 3.6V
= 1.8V
= 80mA TO 800mA
A
A
+ (P
w w w . D a t a S h e e t 4 U . c
3
and power dissipation P
SUPPLY VOLTAGE (V)
LTC3407-3
D
• θ
JA
20µs/DIV
4
).
5
34073 G06
34073fa
D
34073 G03
3
6