LTC3722-1/LTC3722-2
4
372212fb
For more information www.linear.com/LTC3722
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: Sync amplitude = 5V
P-P
, pulse width = 50ns. Verify output (A-F)
frequency = one-half sync frequency.
Note 3: Includes leading edge blanking delay, R
LEB
= 20k.
Note 4: FB is driven by a servo-loop amplifier to control V
COMP
for these
tests.
Note 5: Set FB to –0.3V, 2.5V and insure that COMP does not phase invert.
Note 6: The LTC3722 is tested under pulsed load condition such that
T
J
≈ T
A
. The LTC3722E-1/LTC3722E-2 are guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to
85°C operating junction temperature range are assured by design,
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference
V
REF
Initial Accuracy T
A
= 25°C, Measured on V
REF
4.925 5.00 5.075 V
REFLD Load Regulation Load on V
REF
= 100µA to 5mA 2 15 mV
REFLN Line Regulation V
CC
= 6.5V to 9.5V 0.9 10 mV
REFTV Total Variation Line, Load
l
4.900 5.000 5.100 V
REFSC Short-Circuit Current V
REF
Shorted to GND 18 30 45 mA
Outputs
OUTH(x) Output High Voltage I
OUT(x)
= –50mA 7.9 8.4 V
OUTL(x) Output Low Voltage I
OUT(x)
= 50mA 0.6 1 V
R
HI(x)
Pull-Up Resistance I
OUT(x)
= –50mA to –10mA 22 30 Ω
R
LO(x)
Pull-Down Resistance I
OUT(x)
= –50mA to –10mA 12 20 Ω
t
r(x)
Rise Time C
OUT(x)
= 50pF (Note 8) 5 15 ns
t
f(x)
Fall Time C
OUT(x)
= 50pF (Note 8) 5 15 ns
SDEL SYNC Driver Turn-0ff Delay R
SPRG
= 100k 180 ns
Current Limit and Shutdown
CLPP Pulse by Pulse Current Limit Threshold Measured on CS
LTC3722E-1/LTC3722I-1/LTC3722E-2/LTC3722I-2
LTC3722H-1
270
270
300
300
330
340
mV
mV
CLSD Shutdown Current Limit Threshold Measured on CS 0.55 0.65 0.73 V
CLDEL Current Limit Delay to Output 100mV Overdrive on CS (Notes 3, 7) 80 ns
SSI Soft-Start Current SS = 2.5V 7 12 17 µA
SSR Soft-Start Reset Threshold Measured on SS 0.7 0.4 0.1 V
F LT Fault Reset Threshold Measured on SS 4.5 3.9 3.5 V
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9.5V, C
T
= 270pF, R
DPRG
= 60.4k, R
SPRG
= 100k, unless
otherwise noted (Note 6).
characterization and correlation with statistical process controls. The
LTC3722I-1/LTC3722I-2 are guaranteed over the –40°C to 85°C operating
junction temperature range and the LTC3722H-1 is guaranteed over the
–40°C to 150°C operating junction temperature range.
High junction temperatures degrade operating lifetimes; operating lifetime
is derated for junction temperatures greater than 125°C. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors.
Note 7: Guaranteed by design, not tested in production.
Note 8: Rise time is measured from the 10% to 90% points of the rising
edge of the driver output signal. Fall time is measured from the 90% to
10% points of the falling edge of the driver output signal.
ELECTRICAL CHARACTERISTICS
