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LTC3869-2 Datasheet(PDF) 5 Page - Linear Technology

Part # LTC3869-2
Description  Dual, Fast, Accurate Step-Down DC/DC Controller
Download  54 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3869-2 Datasheet(HTML) 5 Page - Linear Technology

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LTC3838
5
3838fa
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 (TJ, in °C) is calculated from the ambient
temperature (TA, in °C) and power dissipation (PD, in Watts) according to
the formula:
TJ = TA + (PD • θJA)
where
θJA (in °C/W) is the package thermal impedance.
Note 3: The LTC3838 is tested under pulsed loading conditions such that
TJ ≈ TA. The LTC3838E is guaranteed to meet specifications over the 0°C
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.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted (Note 3).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Internal VCC Regulator
VDRVCC1
Internally Regulated DRVCC1 Voltage
6V < VIN < 38V
5.0
5.3
5.6
V
DRVCC1 Load Regulation
IDRVCC1 = 0mA to –100mA
–1.5
–3
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Rising
4.4
4.6
4.8
V
EXTVCC Switchover Hysteresis
200
mV
EXTVCC to DRVCC2 Voltage Drop
VEXTVCC = 5V, IDRVCC2 = –100mA
200
mV
PGood Output
OV
PGOOD Overvoltage Threshold
VFB1,2 Rising, with Respect to Regulated Voltage
5
7.5
10
%
UV
PGOOD Undervoltage Threshold
VFB1,2 Falling, with Respect to Regulated Voltage
–5
–7.5
–10
%
PGOOD Threshold Hysteresis
VFB1,2 Returning to Reference Voltage
2
%
VPGOOD(L)1,2
PGOOD Low Voltage
IPGOOD = 2mA
0.1
0.3
V
tD(PGOOD)1,2
Delay from VFB Fault (OV/UV) to PGOOD
Falling
Delay from VFB Good to PGOOD Rising
50
20
μs
μs
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
(VOUTSENSE1+ – VOUTSENSE1–) or VFB2 to achieve specified error amplifier
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.


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