LTC3589 Linear Technology, LTC3589 Datasheet - Page 8

• Manufacturer Part Number: LTC3589
• Description: 8-Output Regulator
• Manufacturer: Linear Technology

ELECTRICAL CHARACTERISTICS
LTC3589
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 LTC3589 is tested under pulsed load conditions such that T
The LTC3589E is guaranteed to meet specifi cations from 0°C to 85°C
junction temperature. Specifi cations over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3589I is guaranteed
over the –40°C to 125°C operating junction temperature range and the
LTC3589H is guaranteed over the full –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. The junction temperature (T
ambient temperature (T
according to the formula:
T
impedance θ
TYPICAL PERFORMANCE CHARACTERISTICS
8
J
= T
120
100
40
20
14
12
10
80
60
0
A
8
6
4
2
0
2.5
2.5
Standby I
+ (PD • θ
Step-Down Switching Regulator
I
DD
ALL REGULATORS DISABLED
Burst Mode OPERATION
ENABLE TWO BUCKS
vs V
JA
3.0
3.0
= 34°C/W.
JA
IN
VIN
), where the package junction to ambient thermal
ENABLE ONE BUCK
3.5
3.5
vs V
VOLTAGE (V)
VOLTAGE (V)
A
ENABLE THREE BUCKS
in °C) and power dissipation (PD, in Watts)
4.0
4.0
IN
4.5
4.5
5.0
5.0
J
in °C) is calculated from the
22554 G01
3589 G04
5.5
5.5
1200
1000
250
200
150
100
800
600
400
200
50
0
0
–50
2.5
LDO2 to LDO4 I
Input Supply Current vs
Temperature
–25
ENABLE THREE LDOs
ENABLE TWO LDOs
ENABLE ONE LDO
3.0
ALL REGULATORS ENABLED
Burst Mode OPERATION
J
0
≈ T
STANDBY (ONLY LDO1 ON)
TEMPERATURE (°C)
ALL REGULATORS ENABLED
PULSE-SKIPPING MODE
3.5
A
25
.
VOLTAGE (V)
DD
4.0
50
Note that the maximum ambient temperature consistent with these
specifi cations is determined by specifi c operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 3: The LTC3589 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating temperature
may impair device reliability.
Note 4: Dropout voltage is defi ned as (V
(V
measured with V
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Soft-Start measured in test mode with regulator error amplifi er in
unity gain mode.
I
VIN
IN_LDO
75
4.5
vs V
100 125 150
– V
IN
5.0
LDO
T
3589 G02
3589 G05
A
) for other LDOs when V
IN
= 25°C, unless otherwise noted.
5.5
= V
IN_LDO
900
800
700
600
500
400
300
200
100
450
400
350
300
250
200
150
100
= 4.3V.
50
0
0
2.5
2.5
Step-Down Switching Regulator
I
Buck-Boost I
DD
PULSE-SKIPPING MODE
ENABLE THREE BUCKS
ENABLE TWO BUCKS
vs V
3.0
3.0
ENABLE ONE BUCK
IN
LDO
IN
– V
3.5
3.5
is 3% lower than V
LDO
VOLTAGE (V)
DD
FORCED
CONTINUOUS
VOLTAGE (V)
Burst Mode OPERATION
www.DataSheet4U.com
) for LDO1 or
vs V
4.0
4.0
IN
4.5
4.5
LDO
5.0
5.0
3589 G03
3589 G06
3589p
5.5
5.5