LT1109A Datasheet, PDF (4/8 Pages) Linear Technology – Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V

LT1109A
TYPICAL PERFOR A CE CHARACTERISTICS
LT1109A-12
Output Voltage
12.3
12.2
12.1
12.0
11.9
11.8
11.7
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1109A G09
Minimum/Maximum
Oscillator Frequency vs t_ON
160
150
0°C ≤ T_A ≤ 70°C
140
130
120
T_A= 25°C
110
100
90
80
3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
t_ON (µs)
1109A G10
BLOCK DIAGRA S
LT1109A-5, LT1109A-12
V_IN SENSE
1.25V
REF
R2
250k
+
COMP
A1
–
R1*
SW
120kHz
OSC
Q1
DRIVER
GND
SHUTDOWN
*LT1109A-5: R1 = 83k
LT1109A-12: R1 = 29k
PGND
LT1109A (Adjustable)
V_IN
FB
SW
1.25V
REF
+
COMP
A1
–
120kHz
OSC
Q1
DRIVER
GND
SHUTDOWN
PGND
1109A BD
4