Datasheet

LTC3375
6
3375fc
For more information www.linear.com/3375
elecTrical characTerisTics
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
CC
= V
IN1-8
= 3.3V, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Interface Logic Pins (EN1, EN2, EN3, EN4, EN5, EN6, EN7, EN8)
V
HI_ALLOFF
Enable Rising Threshold All Regulators Disabled
l
400 730 1200 mV
V
EN_HYS
Enable Hysteresis 60 mV
V
HI
Enable Rising Threshold At Least One Regulator Enabled
l
380 400 420 mV
I
EN
Enable Pin Leakage Current EN = V
CC
= V
IN
= 5.5V –1 1 µA
Pushbutton Parameters, C
T
= 0.01µF
t
PB_LO
PB Low Time to IRQ Low ON High 28 50 72 ms
t
PB_ON
PB Low Time to ON High 140 200 260 ms
t
PB_OFF
PB Low to ON Forced Low 7 10 13 sec
t
HR
Time for Which All Enabled Regulators
Are Disabled After KILL is Asserted High
ON High 0.7 1 1.3 sec
t
IRQ_PW
IRQ Minimum Pulse Width ON High 28 50 72 ms
t
KILLH
Time in Which KILL Must Be Asserted
High
After ON Rising Edge 7 10 13 sec
t
KILLL
KILL Low Time to ON Low ON High 28 50 72 ms
t
RST
RST Assertion Delay 160 230 300 ms
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3375 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3375E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3375I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LTC3375H is guaranteed over the –40°C to 150°C
operating junction temperature range. High junction temperatures degrade
operating lifetimes; operating lifetime is derated for junction temperatures
greater than 125°C. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors. The junction temperature
(T
J
in °C) is calculated from the ambient temperature (T
A
in °C) and
power dissipation (P
D
in Watts) according to the formula:
T
J
= T
A
+ (P
D
• θ
JA
)
where θ
JA
(in °C/W) is the package thermal impedance.
Note 3: The LTC3375 includes overtemperature protection which protects
the device during momentary overload conditions. Junction temperatures
will exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
may impair device reliability.
Note 4: Static current, switches not switching. Actual current may be
higher due to gate charge losses at the switching frequency.
Note 5: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current rating may result in device
degradation over time.