Datasheet

LTC3407-2
3
sn34072 34072fs
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Load Step
Burst Mode Operation
Pulse Skipping Mode
Efficiency vs Input Voltage
Oscillator Frequency vs Supply
Voltage
Oscillator Frequency vs
Temperature
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3407-2E is guaranteed to meet specified performance
from 0°C to 70°C. Specifications over the – 40°C and 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC3407-2 is tested in a proprietary test mode that connects
V
FB
to the output of the error amplifier.
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T
J
is calculated from the ambient T
A
and power dissipation P
D
according to the following formula: T
J
= T
A
+ (P
D
• θ
JA
).
Note 6: The DFN switch on-resistance is guaranteed by correlation to
wafer level measurements.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, unless otherwise specified. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
POR Power-On Reset Threshold V
FBX
Ramping Up, MODE/SYNC = 0V 8.5 %
V
FBX
Ramping Down, MODE/SYNC = 0V –8.5 %
Power-On Reset On-Resistance 100 200 Ω
Power-On Reset Delay 262,144 Cycles
V
RUN
RUN Threshold ● 0.3 1 1.5 V
I
RUN
RUN Leakage Current ● 0.01 1 µA
2.5
2.4
2.3
2.2
2.1
2.0
FREQUENCY (MHz)
10
8
6
4
2
0
–2
–4
–6
–8
–10
FREQUENCY DEVIATION (%)
SUPPLY VOLTAGE (V)
2
3407 G06
3
456
INPUT VOLTAGE (V)
2
3407 G04
3407 G01 3407 G02 3407 G03
3
456
TEMPERATURE (°C)
–50 25 75
3407 G05
–25 0
50 100 125
100
95
90
85
80
75
70
65
60
EFFICIENCY (%)
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 100mA
CIRCUIT OF FIGURE 1
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 20mA
CIRCUIT OF FIGURE 1
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 80mA TO 800mA
CIRCUIT OF FIGURE 1
V
OUT
= 1.8V
Burst Mode OPERATION
CIRCUIT OF FIGURE 1
800mA
10mA
100mA
1mA
SW
5V/DIV
V
OUT
100mV/DIV
I
L
200mA/DIV
SW
5V/DIV
V
OUT
10mV/DIV
I
L
200mA/DIV
V
OUT
200mV/DIV
I
L
500mA/DIV
I
LOAD
500mA/DIV
2µs/DIV 1µs/DIV 20µs/DIV
V
IN
= 3.6V
T
A
= 25°C unless other wise specified.