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参数资料
| 型号： | LTC3589HUJ-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2600 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-40 |
| 文件页数： | 35/46页 |
| 文件大小： | 570K |
| 代理商： | LTC3589HUJ-1#PBF |
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LTC3589/LTC3589-1
40
3589fc
THERMAL CONSIDERATIONS AND BOARD LAYOUT
Printed Circuit Board Power Dissipation
In order to ensure optimal performance and the ability
to deliver maximum output power to any regulator, it is
critical that the exposed ground pad on the backside of
the LTC3589/LTC3589-1 package be soldered to a ground
plane on the board. The exposed pad is the only GND con-
nection for the LTC3589/LTC3589-1. Correctly soldered to
a 2500mm2 ground plane on a double sided 1oz copper
board the LTC3589/LTC3589-1 has a thermal resistance
(
θJA) of approximately 34°C/W. Failure to make good
thermal contact between the exposed pad on the backside
of the package and an adequately sized ground plane will
result in thermal resistances far greater than 34°C/W.
To ensure the junction temperature of the LTC3589/
LTC3589-1 die does not exceed the maximum rated limit and
to prevent overtemperature faults, the power output of the
LTC3589/LTC3589-1 must be managed by the application.
The total power dissipation in the LTC3589/LTC3589-1 is
approximated by summing the power dissipation in each
of the switching regulators and the LDO regulators.
The power dissipation in a switching regulator is esti-
mated by:
PD(SWX) =(VOUTX IOUTX)
100 – Eff
100
Where VOUTX is the programmed output voltage, IOUTX
is the load current and Eff is the % efficiency that can
be measured or looked up in an efficiency table for the
programmed output voltage.
The power dissipated by an LDO regulator is estimated by:
PD(LDOX) =(VIN(LDOX)–V LDOX) ILDOX
Where VLDOX is the programmed output voltage, VIN(LDOX)
is the LDO supply voltage, and ILDOX is the output load
current. If one of the switching regulator outputs is used
as an LDO supply voltage, remember to include the LDO
supply current in the switching regulator load current for
calculating power loss.
An example using the equations above with the parameters
in Table 19 shows an application that is at the maximum
junction temperature of 125°C at an ambient temperature
of 85°C. LDO2, LDO3, and LDO4 are powered by step-
down switching regulator 2 and the buck-boost switching
regulator. The total load on those two switching regula-
tors is the sum of the application load and the LDO load.
This example is with the LDO regulators at one half rated
current and the switching regulators at three quarters
rated current.
Table 19. TJ Calculation Example
OUTPUT
VIN
VOUT APP LOAD TOTAL
LOAD
EFF
POWER
DISS
LDO1_VSTB 3.8V
1.2V
10mA
30mW
LDO2
1.8V
1.2V
100mA
60mW
LDO3
3.3V
1.8V
100mA
150mW
LDO4
3.3V
2.5V
100mA
80mW
VOUT1
3.8V
1.2V
1.2A
80%
290mW
VOUT2
3.8V
1.8V
0.65A
0.75A
90%
140mW
VOUT3
3.8V
1.25V
0.75A
85%
140mW
VOUT4
3.8V
3.3V
0.70A
0.90A
90%
300mW
TOTAL POWER
1180mW
INTERNAL JUNCTION TEMPERATURE AT 85°C AMBIENT
125°C
OPERATION
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