LTC3855 LINER [Linear Technology], LTC3855 Datasheet - Page 5

• Manufacturer Part Number: LTC3855
• Description: Dual, Fast, Accurate Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
SYMBOL
Internal V
V
V
PGood Output
OV
UV
V
t
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 junction temperature (T
temperature (T
the formula:
where θ
Note 3: The LTC3838 is tested under pulsed loading conditions such that
T
to 85°C operating junction temperature range. Specifications over the
–40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3838I is guaranteed to meet specifications over the –40°C to
125°C operating junction temperature range . 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.
junction temperature range, otherwise specifications are at T
D(PGOOD)1,2
J
DRVCC1
EXTVCC
PGOOD(L)1,2
≈ T
T
J
A
= T
. The LTC3838E is guaranteed to meet specifications over the 0°C
JA
A
CC
(in °C/W) is the package thermal impedance.
+ (P
Regulator
A
D
, in °C) and power dissipation (P
• θ
PARAMETER
Internally Regulated DRV
DRV
EXTV
EXTV
EXTV
PGOOD Overvoltage Threshold
PGOOD Undervoltage Threshold
PGOOD Threshold Hysteresis
PGOOD Low Voltage
Delay from V
Falling
Delay from V
JA
)
CC1
CC
CC
CC
Switchover Voltage
Switchover Hysteresis
to DRV
Load Regulation
FB
FB
CC2
Fault (OV/UV) to PGOOD
Good to PGOOD Rising
J
, in °C) is calculated from the ambient
Voltage Drop
CC1
Voltage
D
, in Watts) according to
CONDITIONS
6V < V
I
EXTV
V
V
V
V
I
DRVCC1
PGOOD
EXTVCC
FB1,2
FB1,2
FB1,2
The
CC
IN
Rising, with Respect to Regulated Voltage
Falling, with Respect to Regulated Voltage
Returning to Reference Voltage
A
= 2mA
= 0mA to –100mA
Rising
= 5V, I
< 38V
l
= 25°C. V
denotes the specifications which apply over the specified operating
DRVCC2
Note 4: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 5: The LTC3838 is tested in a feedback loop that adjusts
(V
output voltages (ITH1,2).
Note 6: Delay times are measured with top gate (TG) and bottom gate
(BG) driving minimum load, and using 50% levels.
OUTSENSE1
IN
= –100mA
= 15V unless otherwise noted (Note 3).
+
– V
OUTSENSE1
–
) or V
FB2
to achieve specified error amplifier
MIN
5.0
4.4
–5
5
–1.5
–7.5
TYP
200
200
5.3
4.6
7.5
0.1
50
20
2
LTC3838
MAX
–10
5.6
4.8
0.3
–3
10
UNITS
3838fa
5
mV
mV
μs
μs
%
%
%
%
V
V
V