LTC1261IS8 Linear Technology, LTC1261IS8 Datasheet - Page 3

• Manufacturer Part Number: LTC1261IS8
• Description: IC VOLT INVERT SW CAP ADJ 8SOIC
• Manufacturer: Linear Technology
• Type: Switched Capacitor (Charge Pump), Invertingr

Specifications of LTC1261IS8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: -1.25 ~ -8 V
• Current - Output: 15mA
• Frequency - Switching: 550kHz
• Voltage - Input: 3 ~ 8 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

Doubler Mode. V
SYMBOL PARAMETER
I
V
SYMBOL PARAMETER
I
V
LTC1261CS Only. Tripler Mode. V
SYMBOL PARAMETER
I
V
SYMBOL PARAMETER
I
V
The
temperature range.
Note 1: The Absolute Maximum Ratings are those values beyond which
the life of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: All typicals are given at T
Note 4: C1 = C2 = 0.1 F means the specifications apply to tripler mode
where V
connected in tripler mode) with C1 connected between C1
C2 connected between C2
V
ELECTRICAL C
LTC1261CS Only. Tripler Mode. V
LTC1261CS Only. Tripler Mode. V
SC
SC
SC
SC
RIP
RIP
RIP
RIP
V
V
V
V
CC
OUT
OUT
OUT
OUT
– V
denotes specifications which apply over the full operating
OUT
CC
– V
Output Regulation
(Note 2)
Output Short-Circuit Current V
Output Ripple Voltage
Output Regulation
Output Short-Circuit Current V
Output Ripple Voltage
Output Regulation
(Note 2)
Output Short-Circuit Current V
Output Ripple Voltage
Output Regulation
Output Short-Circuit Current V
Output Ripple Voltage
= 2V
OUT
CC
= 3V
; for the LTC1261CS this means C1 connects from C1
CC
= 5V 10%, C1 = 0.1 F, C2 = 0 (Note 4), C
CC
(LTC1261CS only; the LTC1261CS8 cannot be
+
and C2
HARA TERISTICS
A
= 25 C.
–
. C2 = 0 implies doubler mode where
CC
CC
CC
C
= 3.3V 10%, C1 = C2 = 0.1 F (Note 4), C
= 2.7V, C1 = C2 = 0.1 F (Note 4), C
= 5V 10%, C1 = C2 = 0.1 F (Note 4), C
CONDITIONS (Note 2)
– 1.24V V
– 1.24V V
– 4V V
I
CONDITIONS (Note 2)
– 1.24V V
I
CONDITIONS (Note 2)
– 1.24V V
– 4.5V V
I
CONDITIONS (Note 2)
– 1.24V V
– 4V V
I
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
= 5mA, V
= 5mA, V
= 5mA, V
= 5mA, V
= 0V
= 0V
= 0V
= 0V
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
– 5V, 0 I
– 5V, 0 I
+
– 5V, 0 I
and C1
– 4V, 0 I
– 4V, 0 I
– 4V, 0 I
– 4.5V, 0 I
– 4V, 0 I
= – 4V
= – 4V
= – 4V
= – 4V
–
OUT
OUT
and
OUT
OUT
OUT
OUT
OUT
OUT
OUT
+
8mA (Note 6)
10mA
3.5mA
= 3.3 F unless otherwise specified.
12mA
8mA
7mA
5mA
6mA
to C2
C1 connects from C1
Note 5: Setting output to < – 7V will exceed the absolute voltage maximum
rating with a 5V supply. With supplies higher than 5V, the output should
never be set to exceed V
Note 6: For output voltages below – 4.5V the LTC1261 may reach 50%
duty cycle and fall out of regulation with heavy load or low input voltages.
Beyond this point, the output will follow the input with no regulation.
Note 7: C grade device specifications are guaranteed over the 0 C to 70 C
temperature range. In addition, C grade device specifications are assured
over the –40 C to 85 C temperature range by design or correlation, but
are not production tested.
OUT
–
= 3.3 F unless otherwise specified.
with C1
OUT
OUT
= 3.3 F unless otherwise specified.
= 3.3 F unless otherwise specified.
–
MIN
MIN
MIN
MIN
and C2
0 C T
0 C T
0 C T
0 C T
+
to C1
+
TYP
TYP
TYP
TYP
CC
60
60
35
35
floating. For the LTC1261CS8 in doubler mode,
1
2
5
1
5
1
2
5
1
2
5
A
A
A
A
– 12V.
–
; there are no C2 pins.
70 C
70 C
70 C
70 C
MAX
MAX
MAX
MAX
125
125
75
75
5
5
5
5
5
5
MIN
MIN
MIN
MIN
– 40 C
– 40 C
– 40 C T
– 40 C T
(Note 7)
(Note 7)
(Note 7)
(Note 7)
TYP
TYP
TYP
TYP
60
60
35
35
1
2
5
1
5
1
2
5
1
2
5
T
T
LTC1261
A
A
A
A
MAX
MAX
MAX
MAX
85 C
85 C
125
85 C
125
85 C
75
75
5
5
5
5
5
UNITS
UNITS
UNITS
UNITS
3
mA
mV
mA
mV
mA
mV
mA
mV
%
%
%
%
%
%
%
%