Datasheet

3
LTC1472
1472fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: V
ENH
= 5V, V
ENL
= 0V. See V
CC
and VPP Switch Truth Tables for
programming enable inputs for desired output states.
Note 3: Power for the V
CC
input logic and charge pump circuitry is derived
from the 5V
IN
power supply which must be continuously powered. 12V
and 3.3V power is not required to control the NMOS V
CC
switches. (See
Applications Information.)
Note 4: The two 3V
IN
supply input pins (14 and 15) must be connected
together and the two V
CC(OUT)
output pins (1 and 16) must be connected
together. The 3V
IN
supply pins do not need to be continuously powered
and may drop to 0V when not required.
Note 5: The V
CC
and VPP output are protected with foldback current limit
which reduces the short-circuit (0V) currents below peak permissible
current levels at higher output voltages.
Note 6: To 90% of final value.
Note 7: 12V power is only required when VPP
OUT
is programmed to 12V.
The external 12V regulator can be shutdown at all other times. Built-in
charge pumps power the internal NMOS switches from the 5V V
DD
supply
when 12V is not present.
Note 8: Power for the VPP input logic and charge pump circuitry is derived
from the V
DD
power supply which must be continuously powered.
Note 9: To 90% of the final value, C
OUT
= 0.1µF, R
OUT
= 2.9k.
Note 10: To 10% of the final value, C
OUT
= 0.1µF, R
OUT
= 2.9k.
Note 11: To 50% of the initial value, C
OUT
= 0.1µF, R
OUT
= 2.9k.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC(IN)
V
CC
Input Voltage Range ● 3 5.5 V
VPP
IN
VPP Input Voltage Range (Note 7) ● 0 12.6 V
V
DD
Logic Supply Voltage Range (Note 8) ● 4.5 5.5 V
I
CCIN
V
CC(IN)
Supply Current, No Load Program to VPP
IN
or V
CC(IN)
VPP
IN
= 12V ● 35 60 µA
Program to 0V or Hi-Z
● 0.01 10 µA
I
PPIN
VPP
IN
Supply Current, No Load Program to VPP
IN
or V
CC(IN)
● 40 80 µA
Program to 0V or Hi-Z
● 0.01 10 µA
I
DD
V
DD
Supply Current, No Load Program to VPP
IN
● 70 120 µA
Program to V
CC(IN)
, VPP
IN
= 0V ● 85 150 µA
Program to V
CC(IN)
, VPP
IN
= 12V ● 40 80 µA
Program to 0V or Hi-Z
● 0.01 10 µA
I
VPPOUT
Hi-Z Output Leakage Current Program to Hi-Z, 0V < VPP
OUT
< 12V ● 0.01 10 µA
R
ON
On Resistance VPP
OUT
to VPP
IN
VPP
IN
= 12V, I
LOAD
= 120mA 0.50 1 Ω
On Resistance VPP
OUT
to V
CC(IN)
V
CC(IN)
= 5V, I
LOAD
= 5mA 1.70 5 Ω
On Resistance VPP
OUT
to GND V
DD
= 5V, I
SINK
= 1mA 100 250 Ω
VPP
ENH
VPP Enable Input High Voltage V
DD
= 5V ● 2V
VPP
ENL
VPP Enable Input Low Voltage V
DD
= 5V ● 0.8 V
I
VPPEN
VPP Enable Input Current 0V < VPP EN < VDD ● ±1 µA
V
SDH
SHDN Output High Voltage Program to 0V, V
CC(IN)
or Hi-Z, I
LOAD
= 400µA ● 3.5 V
V
SDL
SHDN Output Low Voltage Program to VPP
IN
, I
SINK
= 400µA ● 0.4 V
I
LIMVCC
VPP
OUT
Current Limit, V
CC(IN)
Program to V
CC(IN)
, VPP
OUT
= 0V (Note 5) 60 mA
I
LIMVPP
VPP
OUT
Current Limit, VPP
IN
Program to VPP
IN
, VPP
OUT
= 0V (Note 5) 100 mA
t
VPP1
Delay and Rise Time From 0V to V
CC(IN)
,VPP
IN
= 0V (Note 9) 5 15 50 µs
t
VPP2
Delay and Rise Time From 0V to VPP
IN
(Note 9) 25 85 250 µs
t
VPP3
Delay and Rise Time From V
CC(IN)
to VPP
IN
(Note 9) 30 100 300 µs
t
VPP4
Delay and Fall Time From VPP
IN
to V
CC(IN)
(Note 10) 5 15 50 µs
t
VPP5
Delay and Fall Time From VPP
IN
to 0V (Note 11) 10 35 100 µs
t
VPP6
Delay and Fall Time From V
CC(IN)
to 0V, VPP
IN
= 0V (Note 11) 10 30 100 µs
t
VPP7
Output Turn-On Delay From Hi-Z to V
CC(IN)
(Note 9) 5 15 50 µs
t
VPP8
Output Turn-On Delay From Hi-Z to VPP
IN
(Note 9) 25 85 250 µs
(VPP Switch Section) The ● denotes specifications which apply over the full operating temperature range, otherwise specifications
are at T
A
= 25°C. V
DD
= 5V, V
CC(IN)
= 5V, VPP
IN
= 12V, V
CCEN0
= V
CCEN1
= 0V, (Note 2) unless otherwise noted.