ltc3612 Linear Technology Corporation, ltc3612 Datasheet - Page 4

• Manufacturer Part Number: ltc3612
• Description: 3a, 4mhz Monolithic Synchronous Step-down Dc/dc Converter
• Manufacturer: Linear Technology Corporation

LTC3612
ELECTRICAL CHARACTERISTICS
SYMBOL
PGOOD
t
R
V
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 LTC3612E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3612I is guaranteed
over the full –40°C to 125°C operating junction temperature range.
Note 3: This parameter is tested in a feedback loop which servos V
the midpoint for the error amplifi er (V
Note 4: External compensation on ITH pin.
Note 5: Tying the ITH pin to SV
AVP mode.
TYPICAL PERFORMANCE CHARACTERISTICS
4
temperature range, otherwise specifi cations are at T
PGOOD
RUN
PGOOD
100
90
80
70
60
50
40
30
20
10
0
1
Effi ciency vs Load Current
(V
V
OUT
MODE
= 1.8V
10
= 0V)
OUTPUT CURRENT (mA)
PARAMETER
Power Good Voltage Windows
Power Good Blanking Time
Power Good Pull-Down On-Resistance
RUN voltage
100
IN
enables the internal compensation and
1000
V
V
V
ITH
IN
IN
IN
= 5V
= 3.3V
= 2.5V
= 0.75V).
3612 G01
10000
100
90
80
70
60
50
40
30
20
10
0
1
Effi ciency vs Load Current
(V
A
CONDITIONS
TRACK/SS = SV
TRACK/SS = SV
Entering and Leaving Window
Input High
Input Low
V
OUT
= 25°C. V
MODE
V
V
V
V
FB
FB
FB
FB
= 1.2V
The
FB
Ramping Up
Ramping Down
Ramping Up
Ramping Down
= 0V)
10
to
OUTPUT CURRENT (mA)
l
IN
denotes the specifi cations which apply over the full operating junction
= 3.3V, RT/SYNC = SV
IN
IN
, Entering Window
, Leaving Window
100
Note 6: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 7: See description of the TRACK/SS pin in the Pin Functions section.
Note 8: In sourcing mode the average output current is fl owing out of SW
pin. In sinking mode the average output current is fl owing into the SW Pin.
Note 9: See description of the MODE pin in the Pin Functions section.
Note 10: Guaranteed by correlation and design to wafer level
measurements for QFN packages.
Note 11: 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.
1000
V
V
V
IN
IN
IN
= 5V
= 3.3V
= 2.5V
V
3612 G02
IN
10000
= 3.3V, RT/SYNC = SV
IN
l
l
unless otherwise specifi ed (Notes 1, 2, 11).
100
90
80
70
60
50
40
30
20
10
MIN
–3.5
3.5
0
70
8
1
1
Effi ciency vs Load Current
V
OUT
= 1.8V
10
OUTPUT CURRENT (mA)
IN
TYP
105
–6
–9
17
6
9
unless otherwise noted.
100
MAX
–11
140
0.4
11
33
Burst Mode
EXTERNAL
CLAMP = 0.7V
Burst Mode
INTERNAL
CLAMP
PULSE-
SKIPPING
MODE
FORCED
CONTINUOUS
MODE
1000
3612 G03
UNITS
10000
3612f
μs
%
%
%
%
Ω
V
V