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| 型号： | ADP1874-0.6-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP1874 |
| 标准包装： | 1 |
| 系列： | * |
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ADP1874/ADP1875
ON-BOARD LOW DROPOUT REGULATOR
The ADP1874 / ADP1875 use an on-board LDO to bias the
internal digital and analog circuitry. Connect the VREG and
VREG_IN pins together for normal LDO operation for low
ON-BOARD REGULATOR
Data Sheet
The RES detect circuit digitizes the value of the resistor at the
RES pin (Pin 6). An internal ADC outputs a 2-bit digital code
that is used to program four separate gain configurations in the
current-sense amplifier (see Figure 69). Each configuration corre-
sponds to a current-sense gain (A CS ) of 3 V/V, 6 V/V, 12 V/V, or
24 V/V, respectively (see Table 6 and Table 7). This variable is used
VREG
VREG_IN
REF
VIN
for the valley current-limit setting, which sets up the appropriate
current-sense gain for a given application and sets the compensation
necessary to achieve loop stability (see the Valley Current-Limit
Setting section and the Compensation Network section).
Q1
DRVH
Figure 67. Connecting VREG and VREG_IN Together
SW
With proper bypass capacitors connected to the VREG pin (output
of the internal LDO), this pin also provides power for the internal
MOSFET drivers. It is recommended to float VREG/VREG_IN
RES
DRVL
CS GAIN
PROGRAMMING
Q2
if VIN is used for greater than 5.5 V operation. The minimum
Figure 68. Programming Resistor Location
voltage where bias is guaranteed to operate is 2.75 V at VREG.
For applications where VIN is decoupled from VREG, the
minimum voltage at VIN must be 2.9 V. It is recommended to tie
CS
AMP
SW
PGND
VIN and VREG together if the VIN pin is subjected to a 2.75 V rail.
CS GAIN
SET
ADC
0.4V
Table 5. Power Input and LDO Output Configurations
VIN
>5.5 V
VREG/VREG_IN
Float
Comments
Must use the LDO.
<5.5 V
<5.5 V
VIN Ranging
Above and
Below 5.5 V
Connect to VIN
Float
Float
LDO drop voltage is not
realized (that is, if VIN = 2.75 V,
then VREG = 2.75 V).
LDO drop is realized.
LDO drop is realized,
minimum VIN
recommendation is 2.95 V.
RES
Figure 69. RES Detect Circuit for Current-Sense Gain Programming
Table 6. Current-Sense Gain Programming
Resistor A CS
47 kΩ 3 V/V
THERMAL SHUTDOWN
The thermal shutdown is a self-protection feature to prevent the
22 kΩ
Open
100 kΩ
6 V/V
12 V/V
24 V/V
IC from damage due to a very high operating junction temperature.
If the junction temperature of the device exceeds 155°C, the part
enters the thermal shutdown state. In this state, the device shuts off
both the upper side and lower side MOSFETs and disables the entire
controller immediately, thus reducing the power consumption of
the IC. The part resumes operation after the junction temperature
of the part cools to less than 140°C.
PROGRAMMING RESISTOR (RES) DETECT CIRCUIT
Upon startup, one of the first blocks to become active is the RES
detect circuit. This block powers up before soft start begins. It
forces a 0.4 V reference value at the RES pin (see Figure 68) and is
programmed to identify four possible resistor values: 47 k?, 22 k?,
open, and 100 k?.
VALLEY CURRENT-LIMIT SETTING
The architecture of the ADP1874 / ADP1875 is based on valley
current-mode control. The current limit is determined by three
components: the R ON of the lower side MOSFET, the current-
sense amplifier output voltage swing, and the current-sense gain.
The CS output voltage range is internally fixed at 1.4 V. The
current-sense gain is programmable via an external resistor at
section). The R ON of the lower side MOSFET can vary over
temperature and usually has a positive T C (meaning that it
increases with temperature); therefore, it is recommended to
program the current-sense gain resistor based on the rated R ON
of the MOSFET at 125°C.
Rev. A | Page 20 of 44
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP1874-1.0-EVALZ | 功能描述:BOARD EVAL FOR ADP1874 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 |
| ADP1874ARQZ-0.3-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| ADP1874ARQZ-0.6-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| ADP1874ARQZ-1.0-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| ADP1875 | 制造商:AD 制造商全称:Analog Devices 功能描述:Synchronous Buck Controller with Constant On-Time and Valley Current Mode |
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