lt3430-1 Linear Technology Corporation, lt3430-1 Datasheet - Page 3

• Manufacturer Part Number: lt3430-1
• Description: High Voltage, 3a, 100khz Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
PARAMETER
Maximum Switch Duty Cycle (LT3430-1)
Switch Frequency (LT3430)
Switch Frequency (LT3430-1)
f
f
Minimum Input Voltage
Minimum Boost Voltage
Boost Current (Note 5)
Input Supply Current (I
Bias Supply Current (I
Shutdown Supply Current
Lockout Threshold
Shutdown Threshold
Minimum SYNC Amplitude
SYNC Frequency Range (LT3430)
SYNC Frequency Range (LT3430-1)
SYNC Input Resistance
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: Gain is measured with a V
clamp level to 200mV below the upper clamp level.
Note 3: Minimum input voltage is not measured directly, but is guaranteed
by other tests. It is defi ned as the voltage where internal bias lines are still
regulated so that the reference voltage and oscillator remain constant.
Actual minimum input voltage to maintain a regulated output will depend
upon output voltage and load current. See Applications Information.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 5: Boost current is the current fl owing into the BOOST pin with the
pin held 5V above input voltage. It fl ows only during switch on time.
Note 6: Input supply current is the quiescent current drawn by the input
pin when the BIAS pin is held at 5V with switching disabled. Bias supply
current is the current drawn by the BIAS pin when the BIAS pin is held
at 5V. Total input referred supply current is calculated by summing input
supply current (I
With V
temperature range, otherwise specifi cations are at T
SW = Open Circuit, unless otherwise noted.
SW
SW
I
Line Regulation
Shifting Threshold
TOTAL
IN
= 15V, V
= I
VIN
+ (I
VIN
OUT
) with a fraction of bias supply current (I
BIAS
= 5V, I
BIAS
VIN
)(V
)
)
OUT
VIN
/V
= 1.4mA, I
IN
C
)
swing equal to 200mV above the low
BIAS
= 2.9mA, I
CONDITIONS
V
5.5V ≤ V
Df = 10kHz
(Note 3)
(Note 4) I
Boost = V
Boost = V
(Note 6) V
(Note 6) V
⎯ S ⎯ H ⎯ D ⎯ N = 0V, V
V
V
V
C
C
C
C
TOTAL
Set to Give DC = 50%
Open
Open, Shutting Down
Open, Starting Up
BIAS
J
= 25°C. V
= 2.4mA.
IN
):
SW
IN
IN
BIAS
BIAS
≤ 60V
+ 5V, I
+ 5V, I
≤ 2.5A
The
IN
= 5V
= 5V
≤ 60V, SW = 0V, V
●
IN
SW
SW
denotes the specifi cations which apply over the full operating
= 15V, V
= 0.75A
= 2.5A
Note 7: Switch on resistance is calculated by dividing V
by the forced current (3A). See Typical Performance Characteristics for the
graph of switch voltage at other currents.
Note 8: The LT3430EFE/LT3430EFE-1 are guaranteed to meet performance
specifi cations from 0°C to 125°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 LT3430IFE/LT3430IFE-1 are guaranteed over the full –40°C to 125°C
operating junction temperature range.
Note 9: See Peak Switch Current Limit vs Junction Temperature graph in
the Typical Performance Characteristics section.
Note 10: 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.
Note 11: The maximum operational Boost-SW voltage is limited by
thermal and load current constraints. See ‘Boost Pin’ and ‘Thermal
Calculations’ in the Applications Information section.
C
= 1.5V, ⎯ S ⎯ H ⎯ D ⎯ N = 1V, BOOST = Open Circuit,
C
Open
●
●
●
●
●
●
●
●
●
●
●
●
LT3430/LT3430-1
0.15
0.25
MIN
184
172
228
125
2.3
96
94
88
85
0.05
2.42
0.37
0.42
TYP
200
200
100
100
0.8
4.6
1.8
1.5
3.1
1.5
98
25
75
30
20
IN
MAX
0.15
2.53
0.58
0.60
to SW voltage
216
228
115
120
120
100
200
700
250
5.5
2.2
4.2
50
3
UNITS
34301fa
3
%/V
kHz
kHz
kHz
kHz
kHz
kHz
mA
mA
mA
mA
kΩ
µA
µA
%
%
V
V
V
V
V
V
V