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LT3999 Datasheet(PDF) 3 Page - Linear Technology

Part No. LT3999
Description  Low Noise, 1A, 1MHz Push-Pull DC/DC Driver with Duty Cycle Control
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3999 Datasheet(HTML) 3 Page - Linear Technology

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LT3999
3
3999fa
For more information www.linear.com/LT3999
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply and Shutdown
VIN Minimum Operating Voltage
l
2.7
V
VIN Overvoltage Lockout
Internal, Rising
l
36
40
42
V
VIN Supply Current
(Note 3)
4.3
mA
VIN Shutdown Current
VUVLO = 0.3V
0.1
1
μA
UVLO Threshold (Rising)
l
1.15
1.25
1.35
V
UVLO Hysteresis
125
mV
UVLO Pin Current
VUVLO = 1.25V
10
100
nA
OVLO/DC Threshold (Rising)
l
1.15
1.25
1.35
V
OVLO/DC Hysteresis
125
mV
OVLO/DC Pin Current
VOVLO/DC = 1.25V
10
100
nA
Power Switches (SWA, SWB)
Switch Saturation Voltage
ISW = 1A
350
mV
Switch Current Limit
Internal Default
l
1.0
1.4
1.7
A
Non Overlap Time
70
ns
Switch Base Drive Current
ISW = 1A
35
mA
Oscillator/Sync
Switching Frequency
RT = 316k
RT = 49.9k
RT = 12.1k
l
280
50
300
1000
320
kHz
kHz
kHz
Synchronization Frequency Range
100
1000
kHz
SYNC Voltage Threshold
1.5
V
SYNC Pin Input Resistance
200
ILIM/SS
SWA and SWB Current Limit
RILIM/SS = 43.2k
l
0.4
0.5
0.6
A
ILIM/SS Pin Current
10
μA
Duty Cycle
Switch Duty Cycle
OVLO/DC = 0.8V, RDC = 24.3k, RT = 49.9k
OVLO/DC = 0.612V, RDC = 24.3k, RT = 49.9k
OVLO/DC = 0.3V, RDC = 24.3k, RT = 49.9k
l
22
20
25
48
30
%
%
%
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 the device
reliability and lifetime.
Note 2: The LT3999E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3999I Is guaranteed over the –40°C to 125°C operating junction
temperature range. The LT3999H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT3999MP is 100%
tested and guaranteed over the –55°C to 150°C junction temperature
range. High junction temperatures degrade operating lifetimes; operating
lifetime is derated for junction temperatures greater than 125°C.
Note 3: Supply current specification does not include switch drive
currents. Actual supply currents will be higher.


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