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)： 15/27頁
文件大?。?/td> 926K
代理商： ADP5024ACPZ-1-R7
ADP5024
Preliminary Technical Data
Rev. PrA | Page 22 of 27
The peak-to-peak output voltage ripple for the selected
output capacitor and inductor values is calculated using the
following equation:
(
)
OUT
SW
IN
RIPPLE
C
L
f
V
×
=
2
2π
OUT
SW
RIPPLE
C
f
I
×
=
8
Capacitors with lower equivalent series resistance (ESR) are
preferred to guarantee low output voltage ripple, as shown in
the following equation:
RIPPLE
COUT
I
V
ESR
≤
The effective capacitance needed for stability, which includes
temperature and dc bias effects, is a minimum of 7 F and a
maximum of 40 F.
The buck regulators require 10 F output capacitors to
guarantee stability and response to rapid load variations and to
transition into and out of the PWM/PSM modes. A list of
suggested capacitors is shown in Table 9. In certain
applications where one or both buck regulator powers a
processor, the operating state is known because it is
controlled by software. In this condition, the processor can
drive the MODE pin according to the operating state;
consequently, it is possible to reduce the output capacitor
from 10 F to 4.7 F because the regulator does not expect a
large load variation when working in PSM mode (see Figure 50).
Input Capacitor
Higher value input capacitors help to reduce the input voltage
ripple and improve transient response. Maximum input
capacitor current is calculated using the following equation:
IN
OUT
IN
OUT
MAX
LOAD
CIN
V
I
)
(
)
(
≥
To minimize supply noise, place the input capacitor as close
as possible to the VINx pin of the buck. As with the output
capacitor, a low ESR capacitor is recommended.
The effective capacitance needed for stability, which includes
temperature and dc bias effects, is a minimum of 3 F and a
maximum of 10 F. A list of suggested capacitors is shown in
Table 10.
Table 9. Suggested 10 μF Capacitors
Vendor
Type
Model
Case
Size
Voltage
Rating
(V)
Murata
X5R
GRM188R60J106
0603
6.3
Taiyo Yuden
X5R
JMK107BJ475
0603
6.3
TDK
X5R
C1608JB0J106K
0603
6.3
Panasonic
X5R
ECJ1VB0J106M
0603
6.3
Table 10. Suggested 4.7 μF Capacitors
Vendor
Type
Model
Case
Size
Voltage
Rating
(V)
Murata
X5R
GRM188R60J475ME19D
0402
6.3
Taiyo Yuden
X5R
JMK107BJ475
0402
6.3
Panasonic
X5R
ECJ-0EB0J475M
0402
6.3
Table 11. Suggested 1.0 μF Capacitors
Vendor
Type
Model
Case
Size
Voltage
Rating
(V)
Murata
X5R
GRM155B30J105K
0402
6.3
TDK
X5R
C1005JB0J105KT
0402
6.3
Panasonic
X5R
ECJ0EB0J105K
0402
6.3
Taiyo
Yuden
X5R
LMK105BJ105MV-F
0402
10.0
L1 - 1uH
C5
10uF
L2 - 1uH
C6
10uF
C7
1uF
BUCK1
BUCK2
LDO
(Analog)
C1
4.7uF
C3
1uF
2.3V to 5.5V
VIN1
VIN2
VIN3
EN1
VOUT3
PGND2
VOUT2
SW2
PGND1
VOUT1
SW1
VOUT1 @
1200mA
VOUT2 @
1200mA
VOUT3 @
300mA
MODE
AGND
ON
OFF
PSM/PWM
PWM
EN1
EN2
EN3
1.7V to 5.5V
C2
4.7uF
MODE
EN2
EN3
ON
OFF
R1
R2
FB1
R3
R4
FB2
R5
R6
FB3
AVIN
CFILT
0.1uF
Housekeeping
Figure 50. Processor System Power Management with PSM/PWM Control
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