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参数资料
| 型号： | ADP2109ACBZ-1.8-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V .6A 5WLCSP |
| 产品变化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 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： | 1.8V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 5-WFBGA，WLCSP |
| 包装： | 标准包装 |
| 供应商设备封装： | 5-WLCSP |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
| 配用： | ADP2109CB-1.8EVALZ-ND - BOARD EVAL FOR 1.8V ADP2109 |
| 其它名称： | ADP2109ACBZ-1.8-R7DKR |
ADP2109
THEORY OF OPERATION
PWM
Data Sheet
GM ERROR
COMP
PSM
AMP
VIN
SOFT START
I LIMIT
FB
PSM
COMP
PWM/
LOW
CONTROL CURRENT
SW
OSCILLATOR
UNDERVOLTAGE
LOCKOUT
THERMAL
SHUTDOWN
DRIVER
AND
ANTISHOOT-
THROUGH
GND
ADP2109
EN
Figure 26. Functional Block Diagram
The ADP2109 is a step-down dc-to-dc converter that uses a
fixed frequency and high speed current mode architecture. The
high switching frequency and tiny 5-ball WLCSP package allow
for a small step-down dc-to-dc converter solution.
The ADP2109 operates with an input voltage of 2.3 V to 5.5 V and
regulates an output voltage down to 1.0 V.
CONTROL SCHEME
The ADP2109 operates with a fixed frequency, current mode
PWM control architecture at medium to high loads for high
efficiency, but it shifts to a power save mode control scheme
at light loads, to lower the regulation power losses. When
operating in fixed frequency PWM mode, the duty cycle of the
integrated switches is adjusted and regulates the output voltage.
When operating in power save mode at light loads, the output
voltage is controlled in a hysteretic manner, with higher V OUT
ripple. During part of this time, the converter is able to stop
switching and enters an idle mode, which improves conversion
efficiency.
PWM MODE
In PWM mode, the ADP2109 operates at a fixed frequency of
3 MHz, set by an internal oscillator. At the start of each oscillator
cycle, the PFET switch is turned on, putting a positive voltage
across the inductor. Current in the inductor increases until the
current sense signal crosses the peak inductor current threshold
that turns off the PFET switch and turns on the NFET syn-
synchronous rectifier stays on for the rest of the cycle. The
ADP2109 regulates the output voltage by adjusting the peak
inductor current threshold.
POWER SAVE MODE
The ADP2109 smoothly transitions to the power save mode
of operation when the load current decreases below the power
save mode current threshold. On entry to power save mode,
an offset is induced in the PWM regulation level, which makes
the output voltage rise. When it has reached a level of approx-
imately 1.5 % above the PWM regulation level, PWM operation
is turned off. At this point, both power switches are off and the
ADP2109 enters an idle mode. C OUT discharges until V OUT falls
to the PWM regulation voltage, at which point the device drives
the inductor to make V OUT rise again to the upper threshold.
This process repeats while the load current is below the power
save mode current threshold.
Power Save Mode Current Threshold
The power save mode current threshold is set to 80 mA. The
ADP2109 employs a scheme that enables this current to remain
accurately controlled, independent of V IN and V OUT levels. This
scheme also ensures that there is very little hysteresis between
the power save mode current threshold for entry to and exit
from the power save mode. The power save mode current
threshold has been optimized for excellent efficiency over
all load currents.
chronous rectifier. This puts a negative voltage across the
inductor, causing the inductor current to decrease. The
Rev. B | Page 10 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2109CB-1.8EVALZ | 功能描述:BOARD EVAL FOR 1.8V ADP2109 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ADP2109CB-1.8EVALZ | 制造商:Analog Devices 功能描述:ADP2109, DC TO DC CONV, STEP DOWN, EVAL |
| ADP2114 | 制造商:AD 制造商全称:Analog Devices 功能描述:Configurable, Dual 2 A/Single 4 A, Synchronous Step-Down DC-to-DC Regulator |
| ADP2114-2PH-EVALZ | 功能描述:BOARD EVALUATION 1.2V 4A 1.2MHZ RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ADP2114ACPZ-R2 | 功能描述:直流/直流开关调节器 Dual-Step Down Converter w/ 2A x 2output RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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