LT3692AEUH ..................................... –40°C to 125°C
LT3692AIUH ...................................... –40°C to 125°C
LT3692AHUH ..................................... –40°C to 150°C
LT3692AEFE ...................................... –40°C to 125°C
LT3692AIFE ....................................... –40°C to 125°C
LT3692AHFE ...................................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguraTion
TOP VIEW
NC
IND1
SHDN1
TOP VIEW
V
OUT1
DNC*
DNC*
IND1
SW1
V
IN1
NC
SS1
V
OUT1
NC
24 ILIM1
23 V
C1
22 RT/SYNC
33
GND
21 CLKOUT
20 T
J
19 DIV
18 V
C2
17 ILIM2
9 10 11 12 13 14 15 16
IND2
SW2
DNC*
DNC*
SHDN2
V
OUT2
V
IN2
SS2
BST1
CMPO1
CMPI1
FB1
1
2
3
4
5
6
7
8
9
39
GND
38 SW1
37 NC
36 V
IN1
35 SHDN1
34 SS1
33 I
LIM1
32 V
C1
31 NC
30 RT/SYNC
29 CLKOUT
28 T
J
27 DIV
26 V
C2
25 I
LIM2
24 SS2
23 SHDN2
22 V
IN2
21 NC
20 SW2
32 31 30 29 28 27 26 25
BST1 1
CMPO1 2
CMPI1 3
FB1 4
FB2 5
CMPI2 6
CMPO2 7
BST2 8
NC 10
FB2 11
CMPI2 12
CMPO2 13
BST2 14
NC 15
V
OUT2
16
NC 17
IND2 18
NC 19
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
θ
JA
= 23°C/W,
θ
JC(PAD)
= 1.5°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
*DO NOT CONNECT
FE PACKAGE
38-LEAD PLASTIC TSSOP
θ
JA
= 17.5°C/W,
θ
JC(PAD)
= 3°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
2
3692afc
For more information
www.linear.com/3692A
LT3692A
orDer inForMaTion
LEAD FREE FINISH
LT3692AEUH#PBF
LT3692AIUH#PBF
LT3692AHUH#PBF
LT3692AEFE#PBF
LT3692AIFE#PBF
LT3692AHFE#PBF
TAPE AND REEL
LT3692AEUH#TRPBF
LT3692AIUH#TRPBF
LT3692AHUH#TRPBF
LT3692AEFE#TRPBF
LT3692AIFE#TRPBF
LT3692AHFE#TRPBF
PART MARKING*
3692A
3692A
3692A
3692AFE
3692AFE
3692AFE
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
elecTrical characTerisTics
PARAMETER
SHDN Voltage Threshold Ch 1/2
SHDN Input Current Ch 1/2
V
IN1
Undervoltage Lockout (Note 4)
V
IN
Overvoltage Lockout Ch 1/2 (Note 5)
V
IN1
Shutdown Current
V
IN2
Shutdown Current
V
IN1
Quiescent Current
V
IN2
Quiescent Current
Feedback Voltage Ch 1/2
Feedback Voltage Regulation
Feedback Voltage Offset Ch 1 to Ch 2
Feedback Bias Current Ch 1/2
T
J
Output Voltage (Note 6)
T
J
Error
Error Amp g
m
Ch 1/2
Error Amp Source Current Ch 1/2
Error Amp Sink Current Ch 1/2
Error Amp High Clamp Ch 1/2
Error Amp Switching Threshold Ch 1/2
V
SHDN
= 0V
V
SHDN
= 0V
V
SHDN
= 2V
V
SHDN
= 2V
V
VC1/2
= 1V
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
VIN1/2
= 15V unless otherwise specified. (Note 3)
MIN
l
TYP
1.32
0
2.8
39
6
0
MAX
1.4
1
3.1
43
13
2
5
1000
822
830
13
200
UNITS
V
µA
V
V
µA
µA
mA
µA
mV
mV
mV
nA
mV
V
mV
1.24
–1
2.5
36
V
SHDN
= 1.35V
l
l
3
400
l
l
l
l
4
630
806
806
0
85
250
1.23
–380
790
780
–13
0
V
VIN1/2
= 3V to 35V, V
VC1/2
= 0.5V to 1.4V
V
VC1/2
= 1V
V
VC1/2
= 1V
T
J
= 25°C, I
TJ
= 25µA, Temperature = 25°C
I
TJ
= 25µA, Temperature = 125°C
I
TJ
= 25µA, Temperature = –40°C
Temperature = 25°C to 125°C
V
VC1/2
= 1V, I
VC1/2
= ±10µA
V
FB1/2
= 0.7V, V
VC1/2
= 1V
V
FB1/2
=0.9V, V
VC1/2
= 1V
V
FB1/2
= 0.7V
V
FB1/2
= 0V
l
–100
300
17
20
1.7
0.7
0
400
25
28
1.9
0.9
100
500
33
36
2.1
1.08
mV
µMho
µA
µA
V
V
3692afc
For more information
www.linear.com/3692A
3
LT3692A
elecTrical characTerisTics
PARAMETER
Soft-Start Source Current Ch 1/2
Soft-Start V
OH
Ch 1/2
Soft-Start Sink Current Ch 1/2
Soft-Start V
OL
Ch 1/2
Soft-Start to Feedback Offset Ch 1/2
Soft-Start Sink Current Ch 1/2 POR
Soft-Start POR Threshold
Soft-Start SW Disable Ch 1/2
CMPI Bias Current Ch 1/2
CMPO Leakage Ch 1/2
CMPI Threshold Ch 1/2
CMPI Threshold Ch 1/2 of V
FB1/2
CMPI Hysteresis Ch 1/2
CMPO Sink Current Ch 1/2
RT/SYNC Reference Current
Minimum Switching Frequency
Switching Frequency
Maximum Switching Frequency
Switching Phase Angle Ch 1 ≥ Ch 2
DIV Reference Current
CH1 DIV 2 Threshold
CH1 DIV 4 Threshold
CH1 DIV 8 Threshold
CLKOUT V
OL
CLKOUT V
OH
CLKOUT to SW1ON Delay ( t
DCLKOSW1
)
CLKOUT to SW2ON Delay ( t
DCLKOSW2
)
RT/SYNC to CLKOUT Delay ( t
DRTSYNCH
)
RT/SYNC to CLKOUT Delay ( t
DRTSYNCL
)
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
SYNC Frequency = 250kHz
CLKOUT Rising
CLKOUT Falling
V
RT/SYNC
= 0V to 2V Rising Edge
V
RT/SYNC
= 2V to 0V Falling Edge
250
180
140
200
V
DIV
= 1V
R
RT/SYNC
= 0V
R
RT/SYNC
= 0V
R
RT/SYNC
= 0V
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
VIN1/2
= 15V unless otherwise specified. (Note 3)
CONDITIONS
V
FB1/2
= 2V, V
SS1/2
= 0.07V
V
FB1/2
= 2V
V
FB1/2
= 0.7V, V
SS1/2
= 2V
V
FB1/2
= 0V
V
VC1/2
= 1V, V
SS1/2
= 0.4V
V
FB1/2
= 2V, V
SS1/2
= 0.14V (Note 7)
V
FB1/2
= 0V (Note 7)
V
CMPI1/2
= 0.8V
V
CMPI1/2
= 0.8V, V
CMPO1/2
= 40V,
V
CMPI1/2
Rising
V
CMPI1/2
Rising (Note 8)
V
CMPI1/2
V
CMPI1/2
= 0.6V, V
CMPO1/2
= 0.2V,
V
RT/SYNC
= 0.36V (E- and I-Grade)
V
RT/SYNC
= 0.36V (H-Grade)
R
RT/SYNC
=0Ω
R
RT/SYNC
= 28k
R
RT/SYNC
=100k
l
l
l
l
l
MIN
9.5
1.9
0.7
120
–12
150
70
95
–100
700
86
35
200
11.3
11.2
50
925
2.25
10.7
0.44
0.89
1.39
TYP
12
2.15
1.4
160
0
400
100
115
0
70
720
90
60
300
12
12
110
1
2.5
185
12
0.5
1.0
1.5
0.25
2
60
30
300
150
MAX
14.5
2.4
2
200
12
600
140
150
100
500
760
94
85
12.7
13
150
1075
3.0
13.3
0.56
1.06
1.56
UNITS
µA
V
mA
mV
mV
µA
mV
mV
nA
nA
mV
%
mV
µA
µA
µA
kHz
kHz
MHz
Deg
µA
V
V
V
V
V
ns
ns
ns
ns
2000
kHz
Deg
ns
ns
4
3692afc
For more information
www.linear.com/3692A
LT3692A
elecTrical characTerisTics
PARAMETER
Minimum Boost for 100% DC Ch 1/2 (Note 9)
IND + V
OUT
Current Ch 1/2
ILIM1/2 Reference Current
IND to V
OUT
Maximum Current Ch 1/2
V
VOUT1/2
= 0V
V
VOUT1/2
= 5V
V
ILIM
= 0V
V
ILIM1/2
= 0V, V
VOUT
= 1V (Note 10)
V
ILIM1/2
= 0V, V
VOUT
= 5V (Note 10)
V
ILIM1/2
= 0.5V, V
VOUT
= 1V (Note 10)
V
ILIM1/2
= 0.5V, V
VOUT
= 5V (Note 10)
V
ILIM1/2
= 1.5V, V
VOUT
= 1V (Note 10)
V
ILIM1/2
= 1.5V, V
VOUT
= 5V (Note 10)
V
SW1/2
= 0V
I
SW1/2
= 500mA, V
BST1/2
= 18V
I
SW1/2
= 3A, V
BST1/2
= 18V
I
SW1/2
= 500mA, V
BST1/2
= 8V
I
SW1/2
= 3A, V
BST1/2
= 8V
I
SW1/2
= 3A, V
BST1/2
= 8V
7
35
1.6
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
VIN1/2
= 15V unless otherwise specified. (Note 3)
CONDITIONS
MIN
1.6
TYP
2.2
1.5
0.5
10
0.8
1.25
1.4
1.8
3.7
3.7
12
1.8
2
2.2
2.6
4.6
4.6
1
100
300
13
55
2.2
40
85
3.0
MAX
2.6
5
5
16
2.6
3.0
3.6
3.8
5.8
5.8
10
UNITS
V
µA
µA
µA
A
A
A
A
A
A
µA
mV
mV
mA
mA
V
l
l
l
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
IN1/2
and SHDN1/2 pins is 60V for
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. The LT3692AHUH/LT3692AHFE is
guaranteed over the full –40°C to 150°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
IN
undervoltage lockout is defined as the voltage which the V
IN
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 the Applications Information section.
Note 5:
V
IN
overvoltage lockout is defined as the voltage when exceeded
halts converter operation. See the Applications Information section.
Note 6:
The T
J
output voltage represents the temperature at the center
of the die while dissipating quiescent power. Due to switch power
dissipation and temperature gradients across the die, the T
J
output
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
OUT
maximum current is defined as the value of
current flowing from the IND pin to the V
OUT
pin which resets the switch
latch when the V
C
pin is at its high clamp.
Note 11:
This is the minimum voltage across the boost capacitor needed
to guarantee full saturation of the internal power switch.
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