Datasheet

2
LTC1261
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
LTC1261CS8
LTC1261CS8-4
LTC1261CS8-4.5
S8 PART MARKING
1261
12614
126145
Consult factory for Industrial or Military grade parts.
LTC1261CS
E
LECTR
IC
AL C CHARA TERIST
ICS
0 ° C ≤ T
A
≤ 70 ° C–40 ° C ≤ T
A
≤ 85 ° C
(Note 7)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
REF
Reference Voltage ● 1.20 1.24 1.28 1.20 1.24 1.28 V
I
S
Supply Current No Load, SHDN Floating, Doubler Mode ● 600 1000 600 1500 µA
No Load, SHDN Floating, Tripler Mode ● 900 1500 900 2000 µA
No Load, V
SHDN
= V
CC
● 520 520 µA
f
OSC
Internal Oscillator Frequency 550 550 kHz
P
EFF
Power Efficiency 65 65 %
V
OL
REG Output Low Voltage I
REG
= 1mA ● 0.1 0.8 0.1 0.8 V
I
REG
REG Sink Current V
REG
= 0.8V, V
CC
= 3.3V ● 58 58 mA
V
REG
= 0.8V, V
CC
= 5.0V ● 815 815 mA
I
ADJ
Adjust Pin Current V
ADJ
= 1.24V ● 0.01 1 0.01 1 µA
V
IH
SHDN Input High Voltage ● 22 V
V
IL
SHDN Input Low Voltage ● 0.8 0.8 V
I
IN
SHDN Input Current V
SHDN
= V
CC
● 520 525 µA
t
ON
Turn-On Time I
OUT
= 15mA 500 500 µs
ORDER PART
NUMBER
ORDER PART
NUMBER
T
JMAX
= 150°C, θ
JA
= 150°C/W
T
JMAX
= 150°C, θ
JA
= 110°C/W
V
CC
= 3V to 6.5V, T
A
= 25°C unless otherwise specified.
1
2
3
4
8
7
6
5
TOP VIEW
SHDN
REG
OUT
ADJ (COMP*)
V
CC

C1
+

C1
–

GND
S8 PACKAGE
8-LEAD PLASTIC SO
*FOR FIXED VERSIONS
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
1
2
3
4
5
6
7

14
13
12
11
10
9
8

NC
C1
+

C1
–

C2
+

C2
–

GND
R0
V
CC

SHDN
REG
OUT
ADJ
R
ADJ

R1
(Note 1)
Supply Voltage (Note 2)............................................ 9V
Output Voltage (Note 5).............................. 0.3V to –9V
Total Voltage, V
CC
to V
OUT
(Note 2) ........................ 12V
Input Voltage
SHDN Pin ................................. –0.3V to V
CC
+ 0.3V
REG Pin ............................................... –0.3V to 12V
ADJ, R
O,
R1, R
ADJ
............... V
OUT
– 0.3V to V
CC
+ 0.3V
Output Short-Circuit Duration......................... Indefinite
Operating Temperature Range
Commercial ............................................ 0°C to 70°C
Extended Commercial (Note 7).......... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C