LTC3803-5
4
38035fd
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–60
780
785
790
795
800
805
810
815
820
V
FB
VOLTAGE (mV)
60 90
38035 G01
0–30 30 150120
V
CC
= 5V
V
CC
SUPPLY VOLTAGE (V)
4.0
V
FB
VOLTAGE (mV)
792
796
812
800
5.0
6.0
6.5
38035 G02
788
804
808
4.5
5.5
7.0
7.5
T
A
= 25°C
V
CC
≤ V
CLAMP1mA
I
CC
(mA)
0
V
FB
VOLTAGE (mV)
792
796
800
15
25
38035 G03
788
510 20
804
808
812
T
A
= 25°C
TEMPERATURE (°C)
–60
180
190
200
210
220
230
240
OSCILLATOR FREQUENCY (kHz)
0 30 150120
38035 G04
–30
60
90
V
CC
= 5V
V
CC
SUPPLY VOLTAGE (V)
4.0
OSCILLATOR FREQUENCY (kHz)
180
190
200
4.5
5.0
5.5 6.0
38035 G05
6.5 7.0
210
220
185
195
205
215
7.5
T
A
= 25°C
I
CC
(mA)
0
OSCILLATOR FREQUENCY (kHz)
180
190
200
5
10
15 20
38035 G06
210
220
185
195
205
215
25
T
A
= 25°C
Reference Voltage
vs V
CC
Shunt Regulator Current
Reference Voltage
vs Supply VoltageReference Voltage vs Temperature
Oscillator Frequency
vs V
CC
Shunt Regulator Current
Oscillator Frequency
vs Supply Voltage
Oscillator Frequency
vs Temperature
ELECTRICAL CHARACTERISTICS
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 LTC3803-5 is tested under pulsed load conditions such
that T
J
≈ T
A
. The LTC3803E-5 is guaranteed to meet specifi cations
from 0°C to 85°C junction temperature. Specifi cations over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3803I-5 is guaranteed over the –40°C to 125°C operating junction
temperature range, the LTC3803H-5 is guaranteed over the –40°C to
150°C operating junction temperature range and the LTC3803MP-5 is
tested and guaranteed over the full –55°C to 150°C operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifi cations is determined by specifi c operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
Junction temperature (T
J
) is calculated from the ambient temperature T
A
and the power dissipation P
D
in the LTC3803-5 using the formula:
T
J
= T
A
+ (P
D
• 230°C/W)
Note 3: High junction temperatures degrade operating lifetimes; operating
lifetime is derated for junction temperatures greater than 125°C.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC3803-5 is tested in a feedback loop that servos V
FB
to the
output of the error amplifi er while maintaining I
TH
/RUN at the midpoint of
the current limit range.
Note 6: Peak current sense voltage is reduced dependent on duty cycle
and an optional external resistor in series with the SENSE pin (R
SL
). For
details, refer to the programmable slope compensation feature in the
Applications Information section.
Note 7: Guaranteed by design.
