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参数资料
| 型号： | ADP2138ACBZ-2.5-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 2.5V .8A 6WLCSP |
| 产品变化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.5V |
| 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： | 800mA |
| 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： | 6-UFBGA，WLCSP |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-WLCSP（1.03x1.50） |
ADP2138/ADP2139
SHORT-CIRCUIT PROTECTION
The ADP2138/ADP2139 include frequency fold back to prevent
output current runaway on a hard short. When the voltage at
the feedback pin falls below half the target output voltage, indi-
cating the possibility of a hard short at the output, the switching
frequency is reduced to half the internal oscillator frequency.
The reduction in the switching frequency allows more time for
the inductor to discharge, preventing a runaway of output current.
UNDERVOLTAGE LOCKOUT
To protect against battery discharge, undervoltage lockout
(UVLO) circuitry is integrated on the ADP2138/ADP2139. If
the input voltage drops below the 2.15 V UVLO threshold, the
ADP2138/ADP2139 shut down, and both the power switch and
the synchronous rectifier turn off. When the voltage rises above
the UVLO threshold, the soft start period is initiated, and the
part is enabled.
THERMAL PROTECTION
In the event that the ADP2138/ADP2139 junction temperature
rises above 150°C, the thermal shutdown circuit turns off the
converter. Extreme junction temperatures can be the result of
high current operation, poor circuit board design, or high ambient
temperature. A 20°C hysteresis is included so that when thermal
shutdown occurs, the ADP2138/ADP2139 do not return to
operation until the on-chip temperature drops below 130°C.
When coming out of thermal shutdown, soft start is initiated.
SOFT START
The ADP2138/ADP2139 have an internal soft start function
that ramps the output voltage in a controlled manner upon
Data Sheet
possible input voltage drops when a battery or a high impedance
power source is connected to the input of the converter.
After the EN pin is driven high, internal circuits begin to power
up. Start-up time in the ADP2138/ADP2139 is the measure of
when the output is in regulation after the EN pin is driven high.
Start-up time consists of the power-up time and the soft start time.
CURRENT LIMIT
Each ADP2138/ADP2139 has protection circuitry to limit the
amount of positive current flowing through the PFET switch
and the synchronous rectifier. The positive current limit on the
power switch limits the amount of current that can flow from
the input to the output. The negative current limit prevents the
inductor current from reversing direction and flowing out of
the load.
100% DUTY OPERATION
With a drop in V IN or with an increase in I LOAD , the ADP2138/
ADP2139 reach a limit where, even with the PFET switch on
100% of the time, V OUT drops below the desired output voltage.
At this limit, the ADP2138/ADP2139 smoothly transition to a
mode where the PFET switch stays on 100% of the time. When the
input conditions change again and the required duty cycle falls,
the ADP2138/ADP2139 immediately restart PWM regulation
without allowing overshoot on V OUT .
DISCHARGE SWITCH
The ADP2139 has an integrated switched resistor (of typically
100 Ω) to discharge the output capacitor when the EN pin goes
low or when the device enters undervoltage lockout or thermal
shutdown. The time to discharge is typically 200 μs.
startup, thereby limiting the inrush current. This prevents
PWM
COMP
GM ERROR
AMP
VOUT
SOFT START
PSM
COMP
PWM/
PSM
CONTROL
I LIMIT
LOW
VIN
CURRENT
SW
MODE
OSCILLATOR
UNDER-VOLTAGE
LOCK OUT
DRIVER
AND
ANTISHOOT
THROUGH
ADP2139
THERMAL
SHUTDOWN
GND
EN
Figure 34. ADP2139 Functional Block Diagram
Rev. C | Page 12 of 20
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| ADP2138ACBZ-3.0-R7 | 功能描述:IC REG BUCK SYNC 3V 0.8A 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 |
| ADP2138ACBZ-3.3-R7 | 功能描述:IC REG BUCK SYNC 3.3V .8A 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 |
| ADP2138CB-1.8EVALZ | 功能描述:BOARD EVALUATION FOR ADP2138 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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