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參數(shù)資料
| 型號： | ADP5024ACPZ-1-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC24 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, MO-220, LCC-24 |
| 文件頁數(shù)： | 7/27頁 |
| 文件大?。?/td> | 926K |
| 代理商： | ADP5024ACPZ-1-R7 |
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Preliminary Technical Data
ADP5024
Rev. PrA | Page 15 of 27
POWER DISSIPATION AND THERMAL CONSIDERATIONS
The ADP5024 is a highly efficient PMU, and, in most cases,
the power dissipated in the device is not a concern. However,
if the device operates at high ambient temperatures and maxi-
mum loading condition, the junction temperature can reach
the maximum allowable operating limit (125°C).
When the temperature exceeds 150°C, the ADP5024 turns off
all the regulators, allowing the device to cool down. When the
die temperature falls below 130°C, the ADP5024 resumes
normal operation.
This section provides guidelines to calculate the power dissi-
pated in the device and ensure that the ADP5024 operates
below the maximum allowable junction temperature.
The efficiency for each regulator on the ADP5024 is given by
100%
×
=
IN
OUT
P
η
(1)
where:
η
is the efficiency.
PIN
is the input power.
POUT
is the output power.
Power loss is given by
PLOSS
= PIN POUT
(2a)
or
PLOSS
= POUT (1 η)/η
(2b)
Power dissipation can be calculated in several ways. The most
intuitive and practical is to measure the power dissipated at
the input and all the outputs. Perform the measurements at
the worst-case conditions (voltages, currents, and
temperature). The difference between input and output
power is dissipated in the device and the inductor. Use
Equation 4 to derive the power lost in the inductor, and from
this use Equation 3 to calculate the power dissipation in the
ADP5024 buck converter.
A second method to estimate the power dissipation uses the
efficiency curves provided for the buck regulator, and the
power lost on the LDO can be calculated using Equation 12.
When the buck efficiency is known, use Equation 2b to derive
the total power lost in the buck regulator and inductor, use
Equation 4 to derive the power lost in the inductor, and then
calculate the power dissipation in the buck converter using
Equation 3. Add the power dissipated in the buck and in the
LDO to find the total dissipated power.
Note that the buck efficiency curves are typical values and
may not be provided for all possible combinations of VIN,
VOUT, and IOUT. To account for these variations it is necessary
to include a safety margin when calculating the power dissipated
in the buck.
A third way to estimate the power dissipation is analytical
and involves modeling the losses in the buck circuit provided
by Equation 8 to Equation 11 and the losses in the LDO
provided by Equation 12.
BUCK REGULATOR POWER DISSIPATION
The power loss of the buck regulator is approximated by
PLOSS
= PDBUCK1 + PDBUCK2 + PL
(3)
where:
PDBUCK
is the power dissipation on one of the ADP5024 buck
regulators.
PL
is the inductor power losses.
The inductor losses are external to the device and they do not
have any effect on the die temperature.
The inductor losses are estimated (without core losses) by
PL ≈ IOUT1(RMS)
2 × DCRL
(4)
where:
DCRL is the inductor series resistance.
IOUT1(RMS)
is the rms load current of the buck regulator.
12
+
1
)
(
1
r
I
OUT1
RMS
OUT
×
=
(5)
where r is the inductor ripple current
r
≈ VOUT1 × (1 D)/(IOUT1 × L × fSW)
(6)
where:
L
is the inductance.
fSW
is the switching frequency.
D
is the duty cycle.
D
= VOUT1/VIN1
(7)
ADP5024 buck regulator power dissipation, PDBUCK, includes
the power switch conductive losses, the switch losses, and the
transition losses of each channel. There are other sources of
loss, but these are generally less significant at high output
load currents, where the thermal limit of the application is.
Equation 8 captures the calculation that must be made to
estimate the power dissipation in the buck regulator.
PDBUCK
= PCOND + PSW + PTRAN
(8)
The power switch conductive losses are due to the output
current, IOUT1, flowing through the P-MOSFET and the N-
MOSFET power switches that have internal resistance,
RDSON-P and RDSON-N. The amount of conductive power loss
is found by
PCOND
= [RDSON-P × D + RDSON-N × (1 D)] × IOUT12
(9)
where RDSON-P is approximately 0.2 , and RDSON-N is approxi-
mately 0.16 at 125°C junction temperature and VIN1 = VIN2
= 3.6 V. At VIN1 = VIN2 = 2.3 V, these values change to 0.31
and 0.21 , respectively, and at VIN1 = VIN2 = 5.5 V, the
values are 0.16 and 0.14 , respectively.
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