Datasheet
LT3692
3
3692fa
For more information www.linear.com/3692
elecTrical characTerisTics
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)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Voltage Regulation V
VIN1/2
= 3 to 40V, V
VC1/2
= 0.6 to 1.6V
l
780 806 830 mV
Feedback Voltage Offset Ch 1 to Ch 2 V
VC1/2
= 1V
l
–12 0 12 mV
Feedback Bias Current Ch 1/2 V
FB1/2
= 0.8V, V
VC1/2
= 1V
l
0 85 200 nA
T
J
Output Voltage (Note 7) T
J
= 25°C, I
TJ
= 25µA, Temperature = 25°C
I
TJ
= 25µA, Temperature = 125°C
I
TJ
= 25µA, Temperature = –40°C
250
1.23
–380
mV
V
mV
T
J
Error
l
–60 0 60 mV
Error Amp g
m
Ch 1/2 V
VC1/2
= 1V, I
VC1/2
= ±5µA 350 400 450 µMho
Error Amp Source Current Ch 1/2 V
FB1/2
= 0.6V, V
VC1/2
= 1V 19 25 31 µA
Error Amp Sink Current Ch 1/2 V
FB1/2
=1V, V
VC1/2
= 1V 22 28 34 µA
Error Amp High Clamp Ch 1/2 V
FB1/2
= 0.6V 1.7 1.9 2.1 V
Error Amp Switching Threshold Ch 1/2 V
FB1/2
= 0.6V 0.75 0.9 1.05 V
Soft-Start Source Current Ch 1/2 V
FB1/2
= 0.9V, V
SS1/2
= 0.05V
l
9.5 12 14.5 µA
Soft-Start V
OH
Ch 1/2 V
FB1/2
= 0.9V 1.9 2.15 2.4 V
Soft-Start Sink Current Ch 1/2 V
FB1/2
= 0.4V, V
SS1/2
= 2V 0.9 1.4 2 mA
Soft-Start V
OL
Ch 1/2 V
FB1/2
= 0V 120 160 200 mV
Soft-Start to Feedback Offset Ch 1/2 V
VC1/2
= 1V, V
SS1/2
= 0.4V
l
–12 0 12 mV
Soft-Start Sink Current Ch 1/2 POR V
FB1/2
= 0V, V
SS1/2
= 0.12V (Note 8) 150 400 600 µA
Soft-Start POR Threshold Ch 1/2 V
FB1/2
= 0V (Note 8) 70 90 120 mV
Soft-Start SW Disable Ch 1/2 V
FB1/2
= 0V (Note 8) 95 115 150 mV
CMPI Bias Current Ch 1/2 V
CMPI1/2
= 0.8V –100 0 100 nA
CMPO Leakage Ch 1/2 V
CMP1/2
= 0.8V, V
CMPO1/2
= 25V, 70 200 nA
CMPI Threshold Ch 1/2 V
CMPI1/2
Rising
l
700 720 740 mV
CMPI Threshold Ch 1/2 of V
FB1/2
V
CMPI1/2
Rising (Note 9) 86 90 94 %
CMPI Hysteresis Ch 1/2 V
CMPI1/2
35 60 85 mV
CMPO Sink Current Ch 1/2 V
CMPI1/2
= 0.6V, V
CMPO1/2
= 0.2V, 200 300 400 µA
RT/SYNC Reference Current V
FB1/2
= 0.9V, V
RT/SYNC
= 0.5V
l
11.3 12 12.7 µA
Minimum Switching Frequency R
RT/SYNC
=0Ω 50 110 150 kHz
Switching Frequency R
RT/SYNC
= 28k 925 1 1075 MHz
Maximum Switching Frequency R
RT/SYNC
=100k 2.25 2.5 2.75 MHz
Switching Phase Angle Ch 1 ≥ Ch 2 185 Deg
DIV Reference Current V
FB1/2
= 0.9V, V
DIV
= 0.5V
l
10.5 12 13.5 µA
CH1 DIV 2 Threshold R
RT/SYNC
= 0V 0.51 0.58 0.61 V
CH1 DIV 4 Threshold R
RT/SYNC
= 0V 0.9 1.05 1.1 V
CH1 DIV 8 Threshold R
RT/SYNC
= 0V 1.45 1.55 V
CLKOUT V
OL
I
CLKOUT
= –100µA 0.25 V
CLKOUT V
OH
I
CLKOUT
= 100µA 2 V
CLKOUT to SW1ON Delay ( t
DCLKOSW1
) CLKOUT Rising 60 ns
CLKOUT to SW2ON Delay ( t
DCLKOSW2
) CLKOUT Falling 30 ns