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| 型号： | ADP2105ACPZ-3.3-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 1A 16LFCSP |
| 产品培训模块： | Powering 90nm/65nm FPGAs and Processors |
| 设计资源： | Powering the AD9788 Using ADP2105 for Increased Efficiency (CN0141) |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘，CSP |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-LFCSP-VQ |
| 其它名称： | ADP2105ACPZ-3.3-R7DKR |
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Data Sheet
ADP2105/ADP2106/ADP2107
0.1μF
1 0Ω
V IN
INPUT VOLTAGE = 2.7V TO 5.5V
C IN1
FB
16
15
14
13
OFF
ON
1
EN
FB
GND
IN
PWIN1
LX2 12
2
3
4
GND
GND
GND
ADP2105/
ADP2106/
ADP2107
PGND 11
LX1 10
PWIN2 9
V IN
L
FB
R TOP
OUTPUT VOLTAGE
= 0.8V TO V IN
C OUT
LOAD
COMP
5
SS
6
AGND NC
7
8
C IN2
R BOT
R COMP
C SS
C COMP
NC = NO CONNECT
Figure 38. Typical Applications Circuit for Adjustable Output Voltage Option of ADP2105/ADP2106/ADP2107(ADJ)
R TOP = R BOT ? OUT
I PK = I LOAD ( MAX ) + ?
? ? I L ?
? 2 ?
? I L = OUT
V × ( V IN ? V OUT ) I LOAD ( MAX )
When R BOT is determined, calculate the value of the top resistor
( R TOP ) by using the following equation:
? V ? V FB ?
?
? V FB ?
The ADP2105/ADP2106/ADP2107(x.x V) include the resistive
voltage divider internally, reducing the external circuitry required.
For improved load regulation, connect the FB to the output
voltage as close as possible to the load.
INDUCTOR SELECTION
The high switching frequency of ADP2105/ADP2106/ADP2107
allows for minimal output voltage ripple even with small inductors.
The sizing of the inductor is a trade-off between efficiency and
transient response. A small inductor leads to larger inductor
current ripple that provides excellent transient response but
degrades efficiency. Due to the high switching frequency of
ADP2105/ADP2106/ADP2107, shielded ferrite core inductors
are recommended for their low core losses and low electromagnetic
interference (EMI).
As a guideline, the inductor peak-to-peak current ripple (ΔI L ) is
typically set to 1/3 of the maximum load current for optimal
transient response and efficiency, as shown in the following
equations:
≈
V IN × f SW × L 3
For the ADP2106
L > (0.83 μH/V) × V OUT
For the ADP2107
L > (0.66 μH/V) × V OUT
Inductors 4.7 μH or larger are not recommended because they
may cause instability in discontinuous conduction mode under
light load conditions. It is also important that the inductor be
capable of handling the maximum peak inductor current (I PK )
determined by the following equation:
?
Table 6. Minimum Inductor Value for Common Output
Voltage Options for the ADP2105 (1 A)
V IN
V OUT 2.7 V 3.6 V 4.2 V 5.5 V
1.2 V 1.67 μH 2.00 μH 2.14 μH 2.35 μH
1.5 V 1.68 μH 2.19 μH 2.41 μH 2.73 μH
1.8 V 2.02 μH 2.25 μH 2.57 μH 3.03 μH
2.5 V 2.80 μH 2.80 μH 2.80 μH 3.41 μH
3.3 V 3.70 μH 3.70 μH 3.70 μH 3.70 μH
Table 7. Minimum Inductor Value for Common Output
Voltage Options for the ADP2106 (1.5 A)
V IN
2 . 5 × V OUT × ( V IN ? V OUT )
V IN × I LOAD ( MAX )
? L IDEAL = μ H
where f SW is the switching frequency (1.2 MHz).
The ADP2105/ADP2106/ADP2107 use slope compensation in
the current control loop to prevent subharmonic oscillations
V OUT
1.2 V
1.5 V
1.8 V
2.5 V
3.3 V
2.7 V
1.11 μH
1.25 μH
1.49 μH
2.08 μH
2.74 μH
3.6 V
2.33 μH
1.46 μH
1.50 μH
2.08 μH
2.74 μH
4.2 V
2.43 μH
1.61 μH
1.71 μH
2.08 μH
2.74 μH
5.5 V
1.56 μH
1.82 μH
2.02 μH
2.27 μH
2.74 μH
when operating beyond 50% duty cycle. The fixed slope compen-
sation limits the minimum inductor value as a function of
output voltage.
For the ADP2105
L > (1.12 μH/V) × V OUT
Rev. D | Page 17 of 36
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| ADP2105ACPZ-R7 | 功能描述:IC REG BUCK SYNC ADJ 1A 16LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
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| ADP2105-EVAL | 制造商:Analog Devices 功能描述:EVAL KIT FOR 1 AMP/1.5 AMP/2 AMP SYNCH, STEP-DOWN DC-TO-DC C - Bulk |
| ADP2105-EVALZ | 功能描述:BOARD EVAL 2.5V ADJ ADP2105 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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