LT1247CS8 Linear Technology, LT1247CS8 Datasheet - Page 2

• Manufacturer Part Number: LT1247CS8
• Description: IC PWM CURRENT MODE 1MHZ 8SOIC
• Manufacturer: Linear Technology

Specifications of LT1247CS8

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 100%
• Voltage - Supply: 8.2 V ~ 25 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: 0°C ~ 100°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

A
LT1246/LT1247
Supply Voltage ....................................................... 25V
Output Current ...................................................... 1A*
Output Energy (Capacitive Load per Cycle) ............. 5 J
Analog Inputs (Pins 2, 3) .............................. – 0.3 to 6V
Error Amplifier Output Sink Current ..................... 10mA
Power Dissipation at T
Operating Junction Temperature Range
Storage Temperature Range ................ – 65 C to 150 C
Lead Temperature (Soldering, 10 sec)................. 300 C
*The 1A rating for output current is based on transient switching
2
ELECTRICAL C
PARAMETER
Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Output Variation
Output Noise Voltage
Long-Term Stability
Output Short-Circuit Current
Oscillator Section
Initial Accuracy
Voltage Stability
Temperature Stability
Amplitude
Clock Ramp Reset Current
Error Amplifier Section
Feedback Pin Input Voltage
Input Bias Current
Open-Loop Voltage Gain
Unity-Gain Bandwidth
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
requirements.
BSOLUTE
LT1246C/LT1247C ............................. 0 C to 100 C
W
A
HARA TERISTICS
A
XI
25 C ............................... 1W
W
U
C
W
CONDITIONS
I
12V < V
1mA < I
Line, Load, Temperature
10Hz < F < 10kHz, T
T
R
R
12V < V
T
Pin 4
V
V
V
2 < V
T
12V < V
V
V
O
A
MIN
J
T
T
OSC
PIN 1
FB
PIN 2
PIN 2
= 1mA, T
= 25 C
= 125 C, 1000 Hrs.
= 10k, C
= 6.2k, C
= 2.5V
R
O
< T
(Pin 4) = 2V, T
= 2.5V
= 2.7V, V
= 2.3V, V
< 4V
A
CC
REF
CC
CC
J
< T
< 25V
< 25V, T
< 25V
TI
T
J
< 20mA
T
= 3.3nF, T
= 25 C
MAX
= 500pF, T
U
PIN 1
PIN 1
G
J
J
J
= 25 C
= 1.1V
= 5V
= 25 C
= 25 C
S
(Notes 1, 2)
J
J
= 25 C
= 25 C
Consult factory for Industrial and Military grade parts.
PACKAGE/ORDER I FOR ATIO
I
COMP
SENSE
R
T
/C
T
T
FB
JMAX
JMAX
T
1
2
3
4
8-LEAD PLASTIC SO
= 100 C,
= 100 C,
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
TOP VIEW
4.925
– 0.5
4.87
47.5
2.42
MIN
– 30
JA
JA
465
7.9
65
60
1
2
= 130 C/W (N8)
= 150 C/W (S8)
8
7
6
5
V
V
OUTPUT
GND
REF
CC
– 0.05
– 0.75
5.000
2.50
TYP
– 90
500
– 6
0.1
1.7
8.2
50
50
90
3
5
2
6
U
S8 PART MARKING
ORDER PART
5.075
– 180
MAX
5.13
52.5
2.58
LT1246CN8
LT1246CS8
LT1247CN8
LT1247CS8
– 25
535
8.5
– 2
20
25
1
NUMBER
W
1246
1247
UNITS
mV/ C
U
%/ C
MHz
kHz
kHz
mV
mV
mV
mA
mA
mA
mA
dB
dB
%
V
V
V
V
V
A