Datasheet

LT1241 Series
2
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Section
Output Voltage I
O
= 1mA, T
J
= 25°C 4.925 5.000 5.075 V
Line Regulation 12V < V
CC
< 25V ● 320mV
Load Regulation 1mA < I
VREF
< 20mA ● –6 –25 mV
Temperature Stability 0.1 mV/°C
Total Output Variation Line, Load, Temp ● 4.87 5.13 V
Output Noise Voltage 10Hz < F < 10kHz, T
J
= 25°C50µV
Long Term Stability T
A
= 125°C, 1000 Hrs. 5 25 mV
Output Short-Circuit Current ● –30 –90 –180 mA
Oscillator Section
Initial Accuracy R
T
= 10k, C
T
= 3.3nF, T
J
= 25°C 47.5 50 52.5 kHz
R
T
= 13.0k, C
T
= 500pF, T
J
= 25°C 228 248 268 kHz
Voltage Stability 12V < V
CC
< 25V, T
J
= 25°C1%
Temperature Stability T
MIN
< T
J
< T
MAX
–0.05 %/°C
Amplitude T
J
= 25°C (Pin 4) 1.7 V
Clock Ramp Reset Current V
OSC
(Pin 4) = 2V, T
J
= 25°C 7.9 8.2 8.5 mA
Error Amplifier Section
Feedback Pin Input Voltage V
PIN1
= 2.5V ● 2.42 2.50 2.58 V
Input Bias Current V
FB
= 2.5V ● –2 µA
Open-Loop Voltage Gain 2 < V
O
< 4V ● 65 90 dB
Unity-Gain Bandwidth T
J
= 25°C 0.7 1.3 2 MHz
Power Supply Rejection Ratio 12V < V
CC
< 25V ● 60 dB
Output Sink Current V
PIN2
= 2.7V, V
PIN1
= 1.1V ● 26 mA
Output Source Current V
PIN2
= 2.3V, V
PIN1
= 5V ● –0.5 –0.75 mA
E
LECTR
IC
AL C CHARA TERIST
ICS
(Notes 1, 2)
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage ........................................................ 25V
Output Current....................................................... ±1A*
Output Energy (Capacitive Load per Cycle)...............5µJ
Analog Inputs (Pins 2, 3)...............................–0.3 to 6V
Error Amplifier Output Sink Current...................... 10mA
Power Dissipation at T
A
≤ 25°C ................................ 1W
Operating Junction Temperature Range
LT124XC ............................................. 0°C to 100°C
LT124XI......................................... – 40°C to 100°C
LT124XM........................................ –55°C to 125°C
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
requirements.
ORDER PART
NUMBER
LT124XCJ8
LT124XCN8
LT124XCS8
LT124XIN8
LT124XIS8
LT124XMJ8
S8 PART MARKING
124X
124XI
WU
U
PACKAGE
/
O
RDER I FOR ATIO
COMP
FB
I
SENSE

R
T
/C
T
V
REF

V
CC

OUTPUT
GND
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
J8 PACKAGE
8-LEAD CERDIP
1
2
3
4
8
7
6
5

TOP VIEW
T
JMAX
= 125°C, θ
JA
= 100°C/W (J8)
T
JMAX
= 100°C, θ
JA
= 130°C/W (N8)
T
JMAX
= 100°C, θ
JA
= 150°C/W (S8)