參數(shù)資料
型號(hào)： ADP5022ACBZ-6-R7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 20/28頁(yè)
文件大?。?/td> 1071K
描述： IC REG TRPL BCK/LINEAR 16WLCSP
產(chǎn)品變化通告： 8mm Carrier Tape Changes 28/Feb/2012
標(biāo)準(zhǔn)包裝： 1
拓?fù)洌?/td> 降壓（降壓）同步（2），線性（LDO）（1）
功能： 任何功能
輸出數(shù)： 3
頻率 - 開(kāi)關(guān)： 3MHz
電壓/電流 - 輸出 1： 1V，600mA
電壓/電流 - 輸出 2： 1.8V，600mA
電壓/電流 - 輸出 3： 2.5V，150mA
帶 LED 驅(qū)動(dòng)器： 無(wú)
帶監(jiān)控器： 無(wú)
帶序列發(fā)生器： 是
電源電壓： 2.3 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-WFBGA，WLCSP
供應(yīng)商設(shè)備封裝： 16-WLCSP
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： ADP5022ACBZ-6-R7DKR
ADP5022
 
 
Rev. C | Page 20 of 28
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
V
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
2
2?/DIV>
OUT
SW
RIPPLE
C
f   ?/DIV>
?/DIV>
=
8
 
Capacitors with lower equivalent series resistance (ESR) are
preferred to guarantee low output voltage ripple, as shown in
the following equation:
RIPPLE
RIPPLE
COUT
I
V
ESR
d
 
The effective capacitance needed for stability, which includes
temperature and dc bias effects, is a minimum of 7 糉 and a
maximum of 40 糉.
Table 8. Suggested 10 糉 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
 
The buck regulators require 10 糉 output capacitors to guar-
antee stability and response to rapid load variations and to
transition in and out the PWM/PSM modes. In certain
applications, where one or both buck regulator powers a
processor, the operating state is known because it is con-
trolled 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 糉 to 4.7 糉
because the regulator does not expect a large load variation
when working in PSM mode, see Figure 50.
SW1
VIN1
VIN2
EN1
EN2
EN3
VDDA
VIN3
VOUT1
PGND1
MODE
VOUT3
L1
1礖
C4
4.7礔
SW2
VOUT2
PGND2
L2
1礖
C5
4.7礔
C6
1礔
C2
4.7礔
C3
4.7礔
C1
1礔
  V
IN
.5V TO 5.5V
MICRO PMU
ADP5022
PROCESSOR
ANALOG
SUB-SYSTEM
VCORE
GPIO
VIO
VANA
 
Figure 50. Processor System Power Management with PSM/PWM Control
Input Capacitor
Higher value input capacitors help to reduce the input voltage
ripple and improve transient response. Maximum input capa-
citor current is calculated using the following equation:
IN
OUT
IN
OUT
MAX
LOAD
CIN
V
V
V
V
I
I
)
(
)
(

e
 
To minimize supply noise, place the input capacitor as close
to the VIN pin of the BUCK as possible. 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 糉 and a
maximum of 10 糉. A list of suggested capacitors is shown in
Table 9.
Table 9. Suggested 4.7 糉 Capacitors
Vendor
Type    Model
Case
Size
Voltage
Rating
(V)
Murata
X5R
GRM188R60J475ME19D    0603     6.3
Taiyo Yuden    X5R
JMK107BJ475
0603     6.3
Panasonic
X5R
ECJ-0EB0J475M
0402     6.3
 
LDO CAPACITOR SELECTION
Output Capacitor
The ADP5022 LDO is designed for operation with small, space-
saving ceramic capacitors but functions with most commonly
used capacitors as long as care is taken with the ESR value. The
ESR of the output capacitor affects stability of the LDO control
loop. A minimum of 0.70 糉 capacitance with an ESR of 1 ?
or less is recommended to ensure stability of the ADP5022.
Transient response to changes in load current is also affected
by output capacitance. Using a larger value of output capacit-
ance improves the transient response of the ADP5022 to large
changes in load current.
Input Bypass Capacitor
Connecting a 1 糉 capacitor from VIN3 to GND reduces
the circuit sensitivity to printed circuit board (PCB) layout,
especially when long input traces or high source impedance
are encountered. If greater than 1 糉 of output capacitance is
required, increase the input capacitor to match it.
Table 10. Suggested 1.0 糉 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
 
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