lt3692a Linear Technology Corporation, lt3692a Datasheet - Page 4

• Manufacturer Part Number: lt3692a
• Description: Monolithic Dual Tracking 3.5a Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
LT3692A
PARAMETER
CH1 DIV 4 Threshold
CH1 DIV 8 Threshold
CLKOUT V
CLKOUT V
CLKOUT to SW1ON Delay ( t
CLKOUT to SW2ON Delay ( t
RT/SYNC to CLKOUT Delay ( t
RT/SYNC to CLKOUT Delay ( t
SYNC Frequency Range
SYNC Phase Angle Ch 1 to Ch 2
Minimum Switch On-Time Ch 1/2
Minimum Switch Off-Time Ch 1/2
Minimum Boost for 100% DC Ch 1/2 (Note 9)
IND + V
ILIM1/2 Reference Current
IND to V
Switch Leakage Current Ch 1/2
Switch Saturation Voltage Ch 1/2
Boost Current Ch 1/2
Minimum Boost Voltage Ch1/2 (Note 11)
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: Absolute Maximum Voltage at V
nonrepetitive 1 second transients and 40V for continuous operation.
Note 3: The LT3692AEUH/LT3692AEFE 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 LT3692AIUH/LT3692AIFE is guaranteed over the full –40°C to 125°C
operating junction temperature range. High junction temperatures degrade
operating lifetimes. Operating lifetime is derated at junction temperatures
greater than 125°C.
Note 4: V
pin must exceed for operation. The threshold guarantees that internal bias
lines are regulated and switching frequency is constant. Actual minimum
input voltage to maintain a regulated output will depend upon output
voltage and load current. See Applications Information.
Note 5: V
halts converter operation. See Applications Information.
temperature range, otherwise specifications are at T
4
OUT
OUT
IN
IN
OL
OH
Current Ch 1/2
undervoltage lockout is defined as the voltage which the V
overvoltage lockout is defined as the voltage when exceeded
Maximum Current Ch 1/2
DCLKOSW1
DCLKOSW2
DRTSYNCH
DRTSYNCL
)
)
)
)
IN1/2
and SHDN1/2 pins is 60V for
CONDITIONS
R
R
CLKOUT Rising
CLKOUT Falling
V
V
SYNC Frequency = 250kHz
V
V
V
V
V
V
V
V
V
V
I
I
I
I
I
SW1/2
SW1/2
SW1/2
SW1/2
SW1/2
RT/SYNC
RT/SYNC
RT/SYNC
RT/SYNC
VOUT1/2
VOUT1/2
ILIM
ILIM1/2
ILIM1/2
ILIM1/2
ILIM1/2
ILIM1/2
ILIM1/2
SW1/2
= 0V
= 500mA, V
= 3A, V
= 500mA, V
= 3A, V
= 3A, V
= 0V
= 0V, V
= 0V, V
= 0.5V, V
= 0.5V, V
= 1.5V, V
= 1.5V, V
= 0V
= 5V
= 0V to 2V Rising Edge
= 2V to 0V Falling Edge
= 0V
= 0V
A
= 25°C. V
BST1/2
BST1/2
BST1/2
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
The
BST1/2
BST1/2
IN
= 1V (Note 10)
= 5V (Note 10)
= 18V
= 8V
= 8V
l
= 1V (Note 10)
= 5V (Note 10)
= 1V (Note 10)
= 5V (Note 10)
VIN1/2
denotes the specifications which apply over the full operating
= 18V
= 8V
Note 6: The T
of the die while dissipating quiescent power. Due to switch power
dissipation and temperature gradients across the die, the T
voltage measurement does not guarantee that absolute maximum junction
temperature will not be exceeded.
Note 7: An internal power on reset (POR) latch is set on the positive
transition of the SHDN1/2 pin through its threshold, thermal shutdown or
overvoltage lockout. The output of the latch activates current sources on
each SS pin which typically sink 400μA and discharge the SS capacitor.
The latch is reset when both SS pins are driven below the soft-start POR
threshold or the SHDN pin is taken below its threshold.
Note 8: The threshold is expressed as a percentage of the feedback
reference voltage for the channel.
Note 9: To enhance dropout operation, the output switch will be turned off
for the minimum off-time only when the voltage across the boost capacitor
drops below the minimum boost for 100% duty cycle threshold.
Note 10: The IND to V
current flowing from the IND pin to the V
latch when the V
Note 11: This is the minimum voltage across the boost capacitor needed
to guarantee full saturation of the internal power switch.
= 15V unless otherwise specified. (Note 3)
J
output voltage represents the temperature at the center
C
pin is at its high clamp.
l
l
l
l
OUT
maximum current is defined as the value of
1.25
MIN
250
0.9
1.2
1.6
0.8
1.4
1.8
3.7
3.7
1.6
10
35
7
OUT
1.05
1.55
0.25
TYP
300
150
180
140
200
100
300
2.2
1.5
0.5
1.8
2.2
2.6
4.6
4.6
2.2
60
30
12
13
55
2
2
1
pin which resets the switch
2000
MAX
1.15
1.8
2.6
2.6
3.0
3.6
3.8
5.8
5.8
3.0
16
10
40
85
5
5
J
output
UNITS
3692af
Deg
kHz
mV
mV
mA
mA
μA
μA
μA
μA
ns
ns
ns
ns
ns
ns
V
V
V
V
V
A
A
A
A
A
A
V