Datasheet

3
LTC1261
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 (Note 2) MIN TYP MAX MIN TYP MAX UNITS
∆V
OUT
Output Regulation –1.24V ≥ V
OUT
≥ –4V, 0 ≤ I
OUT
≤ 8mA ● 15 %
(Note 2) –1.24V ≥ V
OUT
≥ –4V, 0 ≤ I
OUT
≤ 7mA ● 15 %
–4V ≥ V
OUT
≥ –5V, 0 ≤ I
OUT
≤ 8mA (Note 6) 2 2 %
I
SC
Output Short-Circuit Current V
OUT
= 0V ● 60 125 60 125 mA
V
RIP
Output Ripple Voltage I
OUT
= 5mA, V
OUT
= –4V 5 5 mV
Doubler Mode. V
CC
= 5V ±10%, C1 = 0.1µF, C2 = 0 (Note 4), C
OUT
= 3.3µF unless otherwise specified.
LTC1261CS Only. Tripler Mode. V
CC
= 2.7V, C1 = C2 = 0.1µF (Note 4), C
OUT
= 3.3µF unless otherwise specified.
0 ° C ≤ T
A
≤ 70 ° C–40 ° C ≤ T
A
≤ 85 ° C
(Note 7)
SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS
∆V
OUT
Output Regulation –1.24V ≥ V
OUT
≥ –4V, 0 ≤ I
OUT
≤ 5mA ● 15 15 %
I
SC
Output Short-Circuit Current V
OUT
= 0V ● 60 125 60 125 mA
V
RIP
Output Ripple Voltage I
OUT
= 5mA, V
OUT
= –4V 5 5 mV
0 ° C ≤ T
A
≤ 70 ° C–40 ° C ≤ T
A
≤ 85 ° C
(Note 7)
SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS
∆V
OUT
Output Regulation –1.24V ≥ V
OUT
≥ –4.5V, 0 ≤ I
OUT
≤ 6mA ● 15 15 %
(Note 2) –4.5V ≥ V
OUT
≥ –5V, 0 ≤ I
OUT
≤ 3.5mA ● 25 2 %
I
SC
Output Short-Circuit Current V
OUT
= 0V ● 35 75 35 75 mA
V
RIP
Output Ripple Voltage I
OUT
= 5mA, V
OUT
= –4V 5 5 mV
0 ° C ≤ T
A
≤ 70 ° C–40 ° C ≤ T
A
≤ 85 ° C
(Note 7)
SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS
∆V
OUT
Output Regulation –1.24V ≥ V
OUT
≥ –4V, 0 ≤ I
OUT
≤ 12mA ● 15 15 %
–4V ≥ V
OUT
≥ –5V, 0 ≤ I
OUT
≤ 10mA ● 25 25 %
I
SC
Output Short-Circuit Current V
OUT
= 0V ● 35 75 35 75 mA
V
RIP
Output Ripple Voltage I
OUT
= 5mA, V
OUT
= –4V 5 5 mV
LTC1261CS Only. Tripler Mode. V
CC
= 5V ±10%, C1 = C2 = 0.1µF (Note 4), C
OUT
= 3.3µF unless otherwise specified.
LTC1261CS Only. Tripler Mode. V
CC
= 3.3V ±10%, C1 = C2 = 0.1µF (Note 4), C
OUT
= 3.3µF unless otherwise specified.
to C2
–
with C1
–
and C2
+
floating. For the LTC1261CS8 in doubler mode,
C1 connects from C1
+
to C1
–
; there are no C2 pins.
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
CC
– 12V.
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.
The
● denotes specifications which apply over the full operating
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
A
= 25°C.
Note 4: C1 = C2 = 0.1µF means the specifications apply to tripler mode
where V
CC
– V
OUT
= 3V
CC
(LTC1261CS only; the LTC1261CS8 cannot be
connected in tripler mode) with C1 connected between C1
+
and C1
–
and
C2 connected between C2
+
and C2
–
. C2 = 0 implies doubler mode where
V
CC
– V
OUT
= 2V
CC
; for the LTC1261CS this means C1 connects from C1
+