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LT1959 Datasheet(PDF) 3 Page - Linear Technology

Part No. LT1959
Description  4.5A, 500kHz Step-Down Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1959 Datasheet(HTML) 3 Page - Linear Technology

 
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LT1959
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Switch On Resistance (Note 7)
ISW = 4.5A
0.07
0.1
q
0.13
Maximum Switch Duty Cycle
VFB = 1.05V
90
93
%
q
86
93
%
Switch Frequency
VC Set to Give 50% Duty Cycle
460
500
540
kHz
q
440
560
kHz
Switch Frequency Line Regulation
4.3V
≤ VIN ≤ 15V
q
0
0.15
%/ V
Frequency Shifting Threshold on FB Pin
∆f = 10kHz
q
0.5
0.7
1.0
V
Minimum Input Voltage (Note 3)
q
4.0
4.3
V
Minimum Boost Voltage (Note 4)
ISW ≤ 4.5A
q
2.3
3.0
V
Boost Current (Note 5)
ISW = 1A
q
20
35
mA
ISW = 4.5A
q
90
140
mA
Input Supply Current (Note 6)
q
3.8
5.4
mA
Shutdown Supply Current
VSHDN = 0V, VSW = 0V, VC Open
15
50
µA
q
75
µA
Lockout Threshold
VC Open
q
2.3
2.38
2.46
V
Shutdown Thresholds
VC Open Device Shutting Down
q
0.13
0.37
0.60
V
Device Starting Up
q
0.25
0.45
0.7
V
Synchronization Threshold
q
1.5
2.2
V
Synchronizing Range
580
1000
kHz
SYNC Pin Input Resistance
40
k
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Gain is measured with a VC swing equal to 200mV above the
switching threshold 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 defined as the voltage where internal bias lines are still
regulated so that the reference voltage and oscillator frequency remain
constant. Actual minimum input voltage to maintain a regulated output will
depend on 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 flowing into the boost pin with the pin
held 5V above input voltage. It flows only during switch on time.
Note 6: Input supply current is the bias current drawn by the input pin
with switching disabled.
Note 7: Switch on resistance is calculated by dividing VIN to VSW voltage
by the forced current (4.5A). See Typical Performance Characteristics for
the graph of switch voltage at other currents.
The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, TJ = 25°C, VIN = 5V, VC = 1.5V, Boost = VIN + 5V, switch open, unless
otherwise noted.


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