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参数资料
| 型号： | ADP2121-1.8-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 1.8V ADP2121 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 600mA |
| 输入电压： | 2.3 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 6MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2121 |
ADP2121
THEORY OF OPERATION
V BAT
2.3V TO 5.5V
2.2μF
X5R
6.3V
PV IN
VIN
A2
FB
AV IN
V OUT
C1
R1
R2
AGND
EAMP
PWM
COMP
SHOOT-
THROUGH
CONTROL
PDRIVE
NDRIVE
SW
B1
470nH
V OUT
4.7μF
BG
COMPENSATION
RAMP
V(V IN )
PGND
GND
X5R
6.3V
AGND
THERMAL
PILIM
C2
SHUTDOWN
6MHz
OSCILLATOR
PREF
AGND
SOFT START
LOGIC
AND
ZXCOMP
REF PFM
PFM
PWM/PFM
CONTROL
NREF
COMPARATOR
PFM
DETECT
V IN
FB
BG
THRESHOLD
DETECT
BANDGAP
THRESHOLD
DETECT
B2 EN
ON
OFF
A1 MODE
PWM
AUTO
Figure 51. Internal Block Diagram
OVERVIEW
The ADP2121 is a high efficiency, synchronous step-down
dc-to-dc converter that provides up to 600 mA of continuous
output current. It operates from a 2.3 V to 5.5 V input voltage
for the 1.8 V, 1.82 V, 1.85 V, and 1.875 V (typical) fixed-output
voltages, and from a 2.9 V to 5.5 V input voltage for the 2.3 V
(typical) output voltage. The 6 MHz operating frequency
enables the use of tiny external components. The internal
control schemes of the ADP2121 give excellent stability and
transient response. External control for mode selection and
device enable provide power-saving options that are aided by
internal features such as synchronous rectification and compen-
sation. Other internal features, such as cycle-by-cycle peak current
limit, soft start, undervoltage lockout, output-to-ground short-
circuit protection, and thermal shutdown, protect the internal
and external circuit components.
MODE SELECTION
The ADP2121 has two modes of operation (PWM mode and
auto mode), determined by the state of the MODE pin.
Pull the MODE pin high to force the converter to operate in
PWM mode regardless of the output current. Otherwise, set
MODE low to allow the converter to automatically enter the
power-saving PFM mode at light load currents. Do not leave
this pin floating. The MODE pin is not designed for dynamic
control and should not be changed after the ADP2121 is enabled.
Pulse-Width Modulation (PWM) Mode
The PWM mode forces the part to maintain a fixed frequency
of 6 MHz (typical) over all load conditions. The ADP2121 uses
a hybrid proprietary voltage mode control scheme to control
the duty cycle over load current and line voltage variation. This
control provides excellent stability, transient response, and output
regulation but results in lower efficiencies at light load currents.
Rev. B | Page 14 of 20
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| ADP2121ACBZ-1.85R7 | 功能描述:IC REG BUCK SYNC 1.85V 6WLCSP 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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