Datasheet

LTC2908
8
2908fd
PIN FUNCTIONS
V1 (Pin 1/Pin 4): Voltage Input 1. V1 is the internal V
CC
.
The operating voltage on this pin shall not exceed 6V.
When in normal operation, this pin draws approximately
22μA. Bypass this pin to ground with a 0.1μF (or greater)
capacitor.
V
ADJ5
(Pin 2/Pin 3): Adjustable Voltage Input 5. See Table 1
for recommended ADJ resistors values.
RST (Pin 3/Pin 4): Reset Logic Output. Pulls low when
any voltage input is below the reset threshold and is held
low for 200ms after all voltage inputs are above threshold.
This pin has a weak pull-up to V
CC
and may be pulled above
V
CC
using an external pull-up.
GND (Pin 4/Pin 1): Device Ground.
V
ADJ4
(Pin 5/Pin 8): Adjustable Voltage Input 4.
See Table 1 for recommended ADJ resistors values.
V
ADJ3
(Pin 6/Pin 7): Adjustable Voltage Input 3.
See Table 1 for recommended ADJ resistors values.
V
ADJ2
(Pin 7/Pin 6): Adjustable Voltage Input 2.
See Table 1 for recommended ADJ resistors values.
V
ADJ1
(Pin 8/Pin 5): Adjustable Voltage Input 1.
See Table 1 for recommended ADJ resistors values.
Exposed Pad (Pin 9, DDB8 Only): Exposed pad may be
left open or connected to device ground.
(TS8 Package/DDB8 Package) LTC2908-C1
BLOCK DIAGRAMS
–
+
–
+
–
+
–
+
–
+
–
+
POWER
DETECT
V
CC
V1
C1
C2
C3
C4
C5
C6
V2
V3
V4
V
ADJ1
V
ADJ2
2908 BD
GND
BANDGAP
REFERENCE
V
CC
LTC2908-A1/LTC2908-B1
200ms
RESET PULSE
GENERATOR
RST
6μA