- 您现在的位置：买卖IC网 > PDF目录1838 > MAX16974AUE/V+ (Maxim Integrated Products)IC REG BUCK SYNC 5V/ADJ 16TSSOP PDF资料下载
参数资料
| 型号： | MAX16974AUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V/ADJ 16TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1 V ~ 10 V |
| 输入电压： | 3.5 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 260kHz ~ 2.2MHz |
| 电流 - 输出： | 2A |
| 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-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
Skip Mode
During light-load operation, I INDUCTOR P 240mA, the
device enters skip-mode operation. Skip mode turns
off the internal switch and allows the output to drop
below regulation voltage before the switch is turned on
again. The lower the load current, the longer it takes for
RESETI
R FB1
V OUT
the regulator to initiate a new cycle. Because the con-
verter skips unnecessary cycles, the converter efficiency
increases. During skip mode the quiescent current drops
to 35 F A.
Overtemperature Protection
Thermal-overload protection limits the total power dissipa-
tion in the device. When the junction temperature exceeds
+175°C (typ), an internal thermal sensor shuts down the
MAX16974
FB
R FB2
R FB3
internal bias regulator and the step-down controller, allow-
ing the IC to cool. The thermal sensor turns on the device
again after the junction temperature cools by +15°C.
Applications Information
Output Voltage/Reset Threshold
Resistive Divider Network
Although the device’s output voltage and reset thresh-
old can be set individually, Figure 3 shows a combined
resistive divider network to set the desired output voltage
and the reset threshold using three resistors. Use the
following formula to determine the R FB3 of the resistive
divider network:
Figure 3. Output Voltage/Reset Threshold Resistive Divider
Network
Boost Capacitor for
Dropout Operation
The device has an internal boost capacitor refresh algo-
rithm for dropout operation. This is required to ensure
proper boost capacitor voltage, which delivers power to
the gate drive circuitry. If the high-side MOSFET is on
consecutively for 3.65 clock cycles, the internal counter
detects this and turns off the high-side MOSFET for 0.35
clock cycles. This is of particular concern when V IN is
falling and approaching V OUT and a minimum switching
frequency of 220kHz is used.
R FB3 =
R TOTAL × V REF
V OUT
The worst-case condition for boost capacitor refresh time
is with no load on the output. For the boost capacitor
to recharge completely, the LX node must be pulled to
where V REF = 1V, R TOTAL = selected total resistance of
R FB1 , R FB2 , and R FB3 in ohms, and V OUT is the desired
output voltage in volts.
ground. If there is no current in the inductor, the LX node
does not go to ground. To solve this issue, an internal
load of approximately 100mA is turned on at the 6th
clock cycle, which is determined by a separate counter.
R FB2 =
R TOTAL × V REF_RES
V RES
- R FB3
In the worst-case condition with no load, the LX node
does not go below ground during the first detect of the
3.65 clock cycles. It must wait for the next 3.65 clock
where V REF_RES is 1.2V (see the Electrical Characteristics
table), and V RES is the desired reset threshold in volts.
The precision of the reset threshold function is dependent
on the tolerance of the resistors used for the divider. Care
must be taken to choose the values of the resistors. Too
small a resistor value adds to the device’s quiescent cur-
rent, whereas if the resistors are too large, there is some
noise susceptibility to the FB pin.
cycles to finish. This means the soonest the LX node can
go below ground is 4 + 3.65 = 7.65 clock cycles. This
time does not factor in the size of the inductor and the
time it takes for the inductor current to build up to 100mA
(internal load).
So no-load minimum time before refresh is:
dt (no load) = 7.65 clock cycles = 7.65 x 5μs
(at 220kHz) = 34.77μs
12_ _ ______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16975AEE/V+ | IC REG BUCK SYNC 5V/ADJ 16QSOP |
| MAX16976AEE/V+ | IC REG BUCK 5V/ADJ 0.6A 16QSOP |
| MAX16977SAUE/V+ | IC BUCK SYNC ADJ 2A 16TSSOP |
| MAX1697REUT#TG16 | IC REG SWITCHED CAP INV SOT23-6 |
| MAX16998DAUA/V+ | IC TIMER WATCHDOG 8UMAX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16974EVKIT+ | 功能描述:电源管理IC开发工具 MAX16974 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX16975AAEE/V+ | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16975AAEE/V+T | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16975AEE/V+ | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX16975AEE/V+T | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。