LTC4215 Linear Technology, LTC4215 Datasheet - Page 9

• Manufacturer Part Number: LTC4215
• Description: Hot Swap Controller
• Manufacturer: Linear Technology

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PI FU CTIO S
per 1nF of soft-start capacitor to ensure proper start-up.
Use 1nF minimum to ensure an accurate inrush current.
TIMER: Start-Up Timer Input. Connect a capacitor be-
tween this pin and ground to set a 12.3ms/µF duration
for start-up, after which an overcurrent fault is logged if
the inrush is still current limited. The duration of the off
time is 600ms/µF when overcurrent auto-retry is enabled,
resulting in a 1:50 duty cycle. An internal timer provides
a 100ms start-up time and 5 seconds auto-retry time if
this pin is tied to INTV
timer capacitance per 1nF of soft-start (SS) capacitor to
FU CTIO AL DIAGRA
U
U
U
U
SS
FB
UV
OV (QFN)
EN
(QFN)
ON
V
ADIN (QFN)
SDAI (QFN)
SDAO (QFN)
SDA (SSOP)
SCL
ALERT
DD
INTV
U
10µA
CC
CC
10µA
. Allow an additional 10nF of
V
1.235V
1.235V
1.235V
1.235V
CC
2.84V
15.6V
0.4V
+
–
+
–
+
–
+
–
+
–
+
–
+
–
UVLO1
W
I
RST
OV1
OV2
2
UV
EN
ON
C
V
RESET
OV
DD(UVLO)
OV2
UV
EN
ON
1.235V
0.6V
1.235V
FOLDBACK
AND dI/dt
+
–
V
DD
PG
– V
SOURCE
PWRGD
SENSE
FAULT
LOGIC
I
TM1
TM2
2
C ADDR
CB
ensure proper start-up. The minimum value for the TIMER
capacitor is 10nF.
UV: Undervoltage Comparator Input. Connect this pin
to an external resistive divider from V
at this pin falls below 1.227V, an undervoltage fault is
detected and the GATE turns off. Pulling this pin below
0.4V resets all faults and allows the GATE to turn back on.
Tie to INTV
V
lockout threshold of 2.84V and overvoltage lockout
threshold of 15.6V.
SENSE
+
–
+
–
+
–
DD
5
: Supply Voltage Input. This pin has an undervoltage
0.2V
1.235V
–
–
+
CONVERTER
SENSE
1 OF 27
+ –
A/D
CC
+
(QFN), V
if unused.
–
+
UVLO2
8
CS
2µA
GP
DD
100µA
+
–
+
–
(SSOP)
FET ON
GATE DRIVER
1V
2.64V
PUMP AND
CHARGE
3.1V
GEN
ADR1 (QFN)
ADR2 (QFN)
SOURCE
INTV
TIMER
ADRO
GATE
GPI0
CC
4215 BD
DD
LTC4215
. If the voltage
4215fb
9