LT1952EGN-1#PBF Linear Technology, LT1952EGN-1#PBF Datasheet - Page 4

• Manufacturer Part Number: LT1952EGN-1#PBF
• Description: IC CTLR PWM SGL SWITCH 16-SSOP
• Manufacturer: Linear Technology

Specifications of LT1952EGN-1#PBF

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 560kHz
• Duty Cycle: 90%
• Voltage - Supply: 6.82 V ~ 25 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SSOP
• Frequency-max: 560kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ELECTRICAL CHARACTERISTICS
LT1952/LT1952-1
temperature range, otherwise specifi cations are at T
= 0.1μF , SD_V
PARAMETER
SOUT DRIVER
SOUT Clamp Voltage
SOUT Low Level
SOUT High Level
SOUT Active Pull-Off in Shutdown
SOUT to OUT (Rise) DELAY (t
V
OUT DRIVER
OUT Rise Time
OUT Fall Time
OUT Clamp Voltage
OUT Low Level
OUT High Level
OUT Active Pull-Off in Shutdown
OUT Max Duty Cycle
OUT Max Duty Cycle Clamp
SOFT-START
SS_MAXDC Low Level: V
SS_MAXDC Soft-Start Reset Threshold
SS_MAXDC Active Threshold
SS_MAXDC Input Current (Soft-Start Pull-Down: Idis)
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: The LT1952EGN/LT1952EGN-1 are guaranteed to meet
performance specifi cations from 0°C to 125°C junction temperature.
Specifi cations over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LT1952IGN/LT1952IGN-1 are guaranteed
over the full –40°C to 125°C operating junction temperature range.
Note 3: Rise and Fall times are measured at 10% and 90% levels.
Note 4: Guaranteed by correlation to static test.
4
DELAY
SEC
= 2V, BLANK = 121k, DELAY = 121k, I
OL
DELAY
)
CONDITIONS
I
I
I
FB = 1V
V
COMP = 2.5V, FB = 1V (Note 10)
R
FB = 1V, CL = 1nF (Notes 3, 6)
FB = 1V, CL = 1nF (Notes 3, 6)
I
I
I
I
FB = 1V
I
FB = 1V
V
COMP = 2.5V, FB = 1V, R
(f
SD_V
COMP = 2.5V, FB = 1V, R
(f
SD_V
SD_V
I
Measured on SS_MAXDC
FB = 1V, DC > 0%
SS_MAXDC = 1V, SD_V
(GATE)
(GATE)
(GATE)
(GATE)
(GATE)
(GATE)
(GATE)
(GATE)
(SS_MAXDC)
IN
IN
A
DELAY
OSC
OSC
= 25°C. COMP = open, FB = 1.4V, R
SENSE
= 5V, SD_V
= 5V, SD_V
SEC
SEC
SEC
= 200kHz), V
= 200kHz), V
= 0μA, COMP = 2.5V, FB = 1V
= 25mA
= –25mA, V
= 0μA, COMP = 2.5V, FB = 1V
= 20mA
= 200mA
= –20mA, V
= –200mA, V
= 120k
= 1.4V, SS_MAXDC = V
= 1.32V, SS_MAXDC = 1.84V
= 2.64V, SS_MAXDC = 1.84V
The
= 0V, OC = 0V, OUT = 1nF , V
= 150μA, OC = 1V
SEC
l
SEC
denotes the specifi cations which apply over the full operating
IN
IN
IN
IN
= 0V, SOUT = 1V
= 0V, OUT = 1V
IN
= 10V
= 10V
= 12V, COMP = 2.5V,
= 12V, COMP = 2.5V,
= 12V, COMP = 2.5V,
Note 5: Each IC includes over-temperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when over-temperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
Note 6: Guaranteed but not tested.
Note 7: Maximum recommended SYNC frequency = 500kHz.
Note 8: In applications where the V
network from a SYSTEM V
V
Note 9: V
scaled by x 1.18 (to correlate to worst case V
Note 10: Timing for R = 40k derived from measurement with R = 240k.
SEC
IN ON(MAX)
DELAY
DELAY
= 1.4V, OC = 1V
= 10k
= 10k
IN
REF
< V
start-up current is measured at V
Z
< 25V should be connected from the V
IN
OSC
= 15V, SOUT = open, unless otherwise specifi ed.
= 178k, SYNC = 0V, SS_MAXDC = V
IN
> 25V, an external zener with clamp voltage
IN
10.5
11.5
9.75
63.5
MIN
9.9
10
20
83
25
pin is supplied via an external RC
1
IN
IN
0.45
1.25
0.45
TYP
120
800
= V
0.5
0.9
0.2
0.8
start-up current at V
12
40
50
30
13
90
72
33
IN ON
IN
– 0.25V and
MAX
13.5
0.75
14.5
0.75
80.5
pin to ground.
1.8
41
REF
, V
IN ON
UNITS
19521fd
REF
mA
mA
μA
ns
ns
ns
ns
).
%
%
%
V
V
V
V
V
V
V
V
V
V
V
V