Datasheet

LTC2913
6
2913fb
PIN FUNCTIONS
TMR (Pin 9): Reset Delay Timer. Attach an external capacitor
(C
TMR
) of at least 10pF to GND to set a reset delay time
of 9ms/nF. A 1nF capacitor will generate an 8.5ms reset
delay time. Tie TMR to V
CC
to bypass timer.
UV (Pin 7): Undervoltage Logic Output. Asserts low when
either VH input voltage is below threshold. Held low for a
programmed delay time after both VH inputs are valid. UV
has a weak pull-up to V
CC
and may be pulled above V
CC
using an external pull-up. Leave UV open if unused.
V
CC
(Pin 10): Supply Voltage. Bypass this pin to GND with
a 0.1μF (or greater) capacitor. Operates as a direct supply
input for voltages up to 6V. Operates as a shunt regulator for
supply voltages greater than 6V and must have a resistance
between the pin and the supply to limit input current to no
greater than 10mA. When used without a current-limiting
resistance, V
CC
voltage must not exceed 6V.
VH1/VH2 (Pin 1/Pin 3): Voltage High Inputs 1 and 2. When
the voltage on this pin is below 0.5V, an undervoltage
condition is triggered. Tie pin to V
CC
if unused.
VL1/VL2 (Pin 2/Pin 4): Voltage Low Inputs 1 and 2. When
the voltage on this pin is above 0.5V, an overvoltage condi-
tion is triggered. Tie pin to GND if unused.
0.5V
+
4
V
L2
3
+
V
H2
+
2
V
L1
1
+
V
H1
+
UVLO
UVLO
2V
V
CC
+
1V
V
CC
OV PULSE
GENERATOR
DISABLE
DISABLE
OV LATCH
CLEAR/BYPASS
LTC2913-1
TMRV
CC
9
OV
6
LATCH
8
+
1V
2μA
DIS
8
GND
2913 BD
5
10
UV PULSE
GENERATOR
OSCILLATOR
V
CC
400k
UV
7
400k
LTC2913-2
BLOCK DIAGRAM