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参数资料
| 型号： | MAX15031ATE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC BOOST CONV/CURRENT MON 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 应用： | 转换器电流监控器，APD 偏压应用 |
| 输入电压： | 2.7 V ~ 11 V |
| 输出数： | 1 |
| 输出电压： | 3.7 V ~ 76 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（4x4） |
| 包装： | 托盘 |
80V, 300mW Boost Converter and Current
Monitor for APD Bias Applications
The MAX15031 includes a versatile current monitor
intended for monitoring the APD, PIN, or varactor diode
DC current in fiber and other applications. The
MAX15031 features more than three decades of
dynamic current ranging from 500nA to 4mA and pro-
vides an output current accurately proportional to the
APD current at MOUT.
The MAX15031 also features a shutdown logic input to
disable the device and reduce its standby current to
2μA (max).
Fixed-Frequency PWM Controller
The heart of the MAX15031 current-mode PWM con-
troller is a BiCMOS multiple-input comparator that
simultaneously processes the output-error signal and
switch current signal. The main PWM comparator uses
direct summing, lacking a traditional error amplifier and
its associated phase shift. The direct summing configu-
ration approaches ideal cycle-by-cycle control over the
output voltage since there is no conventional error
amplifier in the feedback path.
The device operates in PWM mode using a fixed-fre-
quency, current-mode operation. The current-mode fre-
quency loop regulates the peak inductor current as a
function of the output error signal.
The current-mode PWM controller is intended for DCM
(discontinuous conduction mode) operation. No internal
slope compensation is added to the current signal.
Charge Pump
At low supply voltages (2.7V to 5.5V), internal charge-
pump circuitry and an external 10nF ceramic capacitor
connected between CP and CN double the available inter-
nal supply voltage to drive the internal switch efficiently.
In the 5.5V to 11V supply voltage range, the charge
pump is not required. In this configuration, disable the
charge pump by connecting CP to IN and leaving CN
unconnected.
Monitor Current Limit (RLIM)
The current limit of the current monitor is programmable
from 1mA to 5mA. Connect a resistor from RLIM to
ground to program the current-limit threshold up to 5mA.
The current monitor mirrors the current out of APD with
a 1:10 ratio, and the MOUT current can be converted to
a voltage signal by connecting a resistor from MOUT to
SGND.
The APD current-monitor range is from 500nA to 4mA,
and the MOUT current-mirror output accuracy is ±10%
from 500nA to 1mA of APD current and ±3.5% from
1mA to 4mA of APD current.
Clamping the Monitor
Output Voltage (CLAMP)
CLAMP provides a means for diode clamping the volt-
age at MOUT; thus V MOUT is limited to (V CLAMP +
0.6V). CLAMP can be connected to either an external
supply or BIAS. CLAMP can be left unconnected if volt-
age clamping is not required.
Adjusting the Boost Converter
Output Voltage (FB/CNTRL)
The boost converter output voltage can be set by con-
necting FB to a resistor-divider from V OUT to ground.
The set-point feedback reference is the 1.245V (typ)
internal reference voltage when V CNTRL > 1.5V and is
equal to the CNTRL voltage when V CNTRL < 1.25V.
To change the converter output on the fly, apply a volt-
age lower than 1.25V (typ) to the CNTRL input and
adjust the CNTRL voltage, which is the reference input
of the error amplifier when V CNTRL < 1.25V (see the
Functional Diagram). This feature can be used to adjust
the APD voltage based on the APD mirror current,
which compensates for the APD avalanche gain varia-
tion with temperature and manufacturing process. As
shown in Figure 4, the voltage signal proportional to the
MOUT current is connected to the ADC (analog to digi-
tal) input of the APD module, which then controls the
reference voltage of the boost converter error amplifier
through a DAC (digital to analog) block connected to
the CNTRL input. The BIAS voltage and, therefore, the
APD current, are controlled based on the MOUT mirror
current, forming a negative feedback loop.
Shutdown ( SHDN )
The MAX15031 features an active-low shutdown input
( SHDN ). Pull SHDN low to enter shutdown. During shut-
down, the supply current drops to 2 μA (30 μA from
BIAS) (max). However, the output remains connected to
the input through the inductor and the output diode,
holding the output voltage to one diode drop below
PWR when the MAX15031 shuts down. Connect SHDN
to IN for always-on operation.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15031ATE+ | 功能描述:直流/直流开关转换器 80V 300mW Boost Conv/Current Mtr 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 |
| MAX15031ATE+T | 功能描述:直流/直流开关转换器 80V 300mW Boost Conv/Current Mtr 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 |
| MAX15031AWE+ | 制造商:Maxim Integrated Products 功能描述:BOOST CNVRTR AND CURRENT MONITOR 16TQFN EP - Rail/Tube |
| MAX15031EVKIT | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX15031 - Bulk |
| MAX15031EVKIT+ | 功能描述:电源管理IC开发工具 MAX15031 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 |
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