Datasheet
LTC1700
3
1700fa
SUPPLY VOLTAGE (V)
1.5
QUIESCENT CURRENT (µA)
250
200
150
100
50
0
2.5
3.5
4.0 6.0
1700 G03
2.0 3.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
1.5
SHUTDOWN CURRENT (µA)
20
18
16
14
12
10
8
6
4
2
0
2.5
3.5
4.0 6.0
1700 G02
2.0 3.0
4.5
5.0
5.5
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TG Transition Time
TG t
r
TG Gate Drive Rise Time C
LOAD
= 3000pF, 10% to 90% 60 100 ns
TG t
f
TG Gate Drive Fall Time C
LOAD
= 3000pF, 90% to 10% 60 100 ns
BG Transition Time
BG t
r
BG Gate Drive Rise Time C
LOAD
= 3000pF, 10% to 90% 80 100 ns
BG t
f
BG Gate Drive Fall Time C
LOAD
= 3000pF, 90% to 10% 50 70 ns
Dead Time
t
dll
BG and TG Gates Go Low C
LOAD
= 3000pF on BG and TG 88 110 ns
t
dhh
BG and TG Gates Go High C
LOAD
= 3000pF on TG and BG 66 90 ns
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
V
OUT
= 3V unless otherwise specified.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1700E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
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
• 150°C/W)
Note 4: At an input supply less than 2.3V, only the start-up circuitry of the
LTC1700 is active. This test ensures the start-up circuitry is working.
Note 5: An input supply at or above this minimum operating voltage
activates the main control loop. Start-up circuitry of the LTC1700 is
shut off.
Note 6: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 7: The LTC1700 is tested in a feedback loop that servos V
FB
to the
feedback point for the error amplifier (V
ITH
= 0.6V)
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Reference Voltage vs
Temperature
Quiescent Current vs Supply
Voltage
Shutdown Current vs Supply
Voltage
TEMPERATURE (°C)
–55
REFERENCE VOLTAGE (V)
1.210
1.208
1.206
1.204
1.202
1.200
1.198
1.196
1.194
1.192
1.190
–15
25
45 125
1700 G01
–35 5
65
85
105