LT1109A Linear Technology, LT1109A Datasheet - Page 4

• Manufacturer Part Number: LT1109A
• Description: Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V/ 12V
• Manufacturer: Linear Technology

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