LTC1922EG-1 Linear Technology, LTC1922EG-1 Datasheet - Page 3

• Manufacturer Part Number: LTC1922EG-1
• Description: IC CTRLR PWM SYNC 20SSOP
• Manufacturer: Linear Technology

Specifications of LTC1922EG-1

• Pwm Type: Voltage/Current Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 99%
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply: -

temperature range, otherwise specifications are at V
SYMBOL
Oscillator
OSCT
OSCV
OSYT
OSYW
OSYWX
OSOP
Error Amplifier
V
FBI
AVOL
I
V
V
I
I
Reference
V
REFTV
REFLD
REFLN
REFSC
Outputs
OUTH(X)
OUTL(X)
R
R
t
t
Current Limit and Shutdown
CLPP
CLSD
SSI
SSR
FLT
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: SYNC pulse width is valid from >20ns and <0.4 • (1/f
V
Note 3: FB is driven by a servo loop amplifier to control V
tests.
IB
SOURCE
SINK
r(X)
f(X)
FB
OH
OL
REF
HI(X)
LO(X)
SYNC
= 0V to 5V.
PARAMETER
Total Variation
C
SYNC Threshold
Minimum SYNC Pulse Width
Maximum SYNC Pulse Width
SYNC Output Pulse Width
FB Input Voltage
FB Input Range
Open-Loop Gain
Input Bias Current
Output High
Output Low
Output Source Current
Output Sink Current
Initial Accuracy
Total Variation
Load Regulation
Line Regulation
Short-Circuit Current
Output High Voltage
Output Low Voltage
Pull-Up Resistance
Pull-Down Resistance
Rise Time
Fall Time
Pulse-by-Pulse Current Limit Threshold
Shutdown Current Limit Threshold
Soft-Start Current
Soft-Start Reset Threshold
FAULT Reset Threshold
T
RAMP Amplitude
COMP
CC
OSC
for these
= 9.5V, C
Measured on CS
CONDITIONS
V
Measured on C
Measured on SYNC
Measured at Outputs (Note 2)
Measured on Outputs, C
Measured on SYNC, R
COMP = 2.5V (Note 3)
Measured on FB (Note 4)
COMP = 1V to 3V (Note 3)
COMP = 2.5V (Note 3)
Load on COMP = –100 A
Load on COMP = 100 A
COMP = 2.5V
COMP = 2.5V
T
Line, Load and Temperature
Load on V
V
V
I
I
I
I
C
C
Measured on CS
SS = 2.5V
Measured on SS
Measured on SS
OUT(X)
OUT(X)
OUT(X)
OUT(X)
),
CC
A
CC
REF
OUT(X)
OUT(X)
= 25 C, Measured on V
The
= 6.5V to 9.5V
= 6.5V to 9.5V
Shorted to GND
= –50mA
= 50mA
= –50mA to –10mA
= –50mA to –10mA
= 50pF
= 50pF
T
REF
denotes the specifications which apply over the full operating
= 180pF, T
= 100 A to 5mA
T
Note 4: Set FB to –0.3V, 2.5 and insure that COMP does not phase invert.
Note 5: The LTC1922-1E is guaranteed to meet performance specifications
from 0 C to 85 C. Specification over the –40 C to 85 C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC1922-1I is guaranteed and tested
over the – 40 C to 85 C operating temperature range.
SYNC
T
A
= 180pF
= T
REF
= 5.1k
MIN
to T
MAX
unless other wise noted.
1.179
– 400
4.925
–0.3
0.34
0.55
MIN
236
3.6
1.6
4.7
4.9
7.9
0.7
4.4
70
18
3
7
LTC1922-1
1.204
0.415
– 800
3.85
4.92
0.18
0.64
TYP
277
170
1.8
0.1
8.4
0.6
0.4
4.1
90
30
22
12
12
6
5
7
5
5
2
5
5
1.229
5.075
MAX
0.48
0.73
319
4.2
2.2
1.3
2.5
0.4
5.1
0.1
3.8
50
15
10
45
30
20
15
15
17
1
UNITS
3
kHz
mA
mV
mV
mA
dB
nA
ns
ns
ns
ns
V
V
V
V
V
V
A
V
V
V
V
V
V
A
V
V
s