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參數資料
| 型號： | ADP5042ACPZ-2-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 23/32頁 |
| 文件大?。?/td> | 1378K |
| 描述： | IC REG TRPL BCK/LINEAR 20LFCSP |
| 標準包裝： | 1 |
| 拓撲： | 降壓（降壓）同步（1），線性（LDO）（2） |
| 功能： | 任何功能 |
| 輸出數： | 3 |
| 頻率 - 開關： | 3MHz |
| 電壓/電流 - 輸出 1： | 1.5V，800mA |
| 電壓/電流 - 輸出 2： | 1.8V，300mA |
| 電壓/電流 - 輸出 3： | 3.3V，300mA |
| 帶 LED 驅動器： | 無 |
| 帶監控器： | 是 |
| 帶序列發生器： | 是 |
| 電源電壓： | 1.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-WFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 20-LFCSP-WQ（4x4） |
| 包裝： | 標準包裝 |
| 其它名稱： | ADP5042ACPZ-2-R7DKR |
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Data Sheet
ADP5042
Rev. A | Page 23 of 32
APPLICATIONS INFORMATION
BUCK EXTERNAL COMPONENT SELECTION
Trade-offs between performance parameters such as efficiency
and transient response can be made by varying the choice of
external components in the applications circuit, as shown in
Figure 66.
Inductor
The high switching frequency of the ADP5042 buck allows for
the selection of small chip inductors. For best performance, use
inductor values between 0.7 糎 and 3 糎. Suggested inductors
are shown in Table 11.
The peak-to-peak inductor current ripple is calculated using
the following equation:
L
f
V
V
V
V
I
SW
IN
OUT
IN
OUT
RIPPLE
?/DIV>
?/DIV>
?/DIV>
=
)
(
where:
f
SW
is the switching frequency.
L is the inductor value.
The minimum dc current rating of the inductor must be greater
than the inductor peak current. The inductor peak current is
calculated using the following equation:
2
)
(
RIPPLE
MAX
LOAD
PEAK
I
I
I
+
=
Inductor conduction losses are caused by the flow of current
through the inductor, which has an associated internal dc
resistance (DCR). Larger sized inductors have smaller DCR,
which may decrease inductor conduction losses. Inductor core
losses are related to the magnetic permeability of the core material.
Because the buck is high switching frequency dc-to-dc converters,
shielded ferrite core material is recommended for its low core
losses and low EMI.
Table 11. Suggested 1.0 糎 Inductors
Vendor
Model
Dimensions
(mm)
ISAT
(mA)
DCR
(m?
Murata
LQM2MPN1R0NG0B 2.0 ?1.6 ?0.9
1400
85
Murata
LQM18FN1R0M00B 1.6 ?0.8 ?0.8
150
26
Taiyo Yuden CBMF1608T1R0M
1.6 ?0.8 ?0.8 290
90
Coilcraft
EPL2014-102ML
2.0 ?2.0 ?1.4
900
59
TDK
GLFR1608T1R0M-LR 1.6 ?0.8 ?0.8 230
80
Coilcraft
0603LS-102
1.8 ?1.69 ?1.1 400
81
Toko
MDT2520-CN
2.5 ?2.0 ?1.2
1350
85
Output Capacitor
Higher output capacitor values reduce the output voltage ripple
and improve load transient response. When choosing this value,
it is also important to account for the loss of capacitance due to
output voltage dc bias.
Ceramic capacitors are manufactured with a variety of dielec-
trics, each with a different behavior over temperature and
applied voltage. Capacitors must have a dielectric adequate
to ensure the minimum capacitance over the necessary
temperature range and dc bias conditions. X5R or X7R
dielectrics with a voltage rating of 6.3 V or 10 V are recom-
mended for best performance. Y5V and Z5U dielectrics are
not recommended for use with any dc-to-dc converter because
of their poor temperature and dc bias characteristics.
The worst-case capacitance accounting for capacitor variation
over temperature, component tolerance, and voltage is calcu-
lated using the following equation:
C
EFF = COUT ?/SPAN> (1 TEMPCO) ?/SPAN> (1 TOL)
where:
CEFF is the effective capacitance at the operating voltage.
TEMPCO is the worst-case capacitor temperature coefficient.
TOL is the worst-case component tolerance.
In this example, the worst-case temperature coefficient (TEMPCO)
over 40癈 to +85癈 is assumed to be 15% for an X5R dielectric.
The tolerance of the capacitor (TOL) is assumed to be 10%, and
COUT is 9.2481 糉 at 1.8 V, as shown in Figure 61.
Substituting these values in the equation yields
CEFF = 9.2481 糉 ?(1 0.15) ?(1 0.1) = 7.0747 糉
To guarantee the performance of the buck, it is imperative
that the effects of dc bias, temperature, and tolerances on the
behavior of the capacitors be evaluated for each application.
0
2
4
6
8
10
12
0
1
2
3
4
5
6
DC BIAS VOLTAGE V
Figure 61. Typical Capacitor Performance
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相關代理商/技術參數 |
參數描述 |
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| ADP5042CP-1-EVALZ | 功能描述:電源管理IC開發工具 Output Buck Regulator + Dual Fixed Eval RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| ADP5042CP-2-EVALZ | 功能描述:電源管理IC開發工具 Output Buck Regulator + Dual Fixed Eval RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| ADP5043ACPZ-1-R7 | 功能描述:IC REG DL BUCK/LINEAR 20LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數:5 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監控器:無 帶序列發生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| ADP5043CP-1-EVALZ | 功能描述:BOARD EVAL ADP5043CP-1 RoHS:是 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:* 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADP50450003CBZR | 制造商:Analog Devices 功能描述: |
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