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参数资料
| 型号： | MAX8625AETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.8A 14TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，1.25 V ~ 4 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 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： | 14-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 其它名称： | MAX8625AETD+TDKR |
High-Efficiency, Seamless Transition,
Step-Up/Down DC-DC Converter
or oscillation between the boost and buck modes as
seen in other step-up/down converters. See the switch-
ing waveforms for each of the three modes and transi-
tion waveforms in the Typical Operating Characteristics
section.
Forced-PWM Mode
Drive SKIP high to operate the MAX8625A in forced-
PWM mode. In this mode, the IC operates at a constant
1MHz switching frequency with no pulse skipping. This
scheme is desirable in noise-sensitive applications
because the output ripple is minimized and has a pre-
dictable noise spectrum. Forced PWM consumes higher
supply current at light loads due to constant switching.
Skip Mode
Drive SKIP low to operate the MAX8625A in skip mode
to improve light-load efficiency. In skip mode, the IC
switches only as necessary to maintain the output at
light loads, but still operates with fixed-frequency PWM
at medium and heavy loads. This maximizes light-load
efficiency and reduces the input quiescent current to
37μA (typ).
Do not dynamically transition between skip and FPWM.
The MAX8625A is not designed for dynamic transitions
between FPWM and skip modes. Spikes of negative
inductor current are possible when making these types
of dynamic transitions. The magnitude of the spike
depends on the load and output capacitance. The
MAX8625A has no protection against these types of
negative current spikes.
Load Regulation and Transient Response
During a load transient, the output voltage instantly
changes due to the ESR of the output capacitors by an
amount equal to their ESR times the change in load
current ( ? V OUT = R ESR x ? I LOAD ). The output voltage
then deviates further based on the speed at which the
loop compensates for the load step. Increasing the out-
put capacitance reduces the output-voltage droop. See
the Capacitor Selection section. The typical application
circuit limits the output transient droop to less than 3%.
See the Typical Operating Characteristics section.
Soft-Start
Soft-start prevents input inrush current during startup.
Internal soft-start circuitry ramps the peak inductor cur-
rent with an internal DAC in 8ms. Once the output
reaches regulation, the current limit immediately jumps
to the maximum threshold. This allows full load capabil-
ity as soon as regulation is reached, even if it occurs
before the 8ms soft-start time is complete.
When using the MAX8625A at low input voltages (close
to UVLO and < 3V), it is recommended that the ON pin
should not be tied to the BATT or supply voltage node
directly. The ON pin should be held low for > 1ms after
power to the MAX8625A is applied before it is driven
high for normal operation.
Shutdown
Drive ON low to place the MAX8625A in shutdown
mode and reduce supply current to less than 1μA.
During shutdown, OUT is disconnected from IN, and
LX1 and LX2 are connected to GND. Drive ON high for
normal operation.
Fault and Thermal Shutdown
The MAX8625A contains current-limit and thermal shut-
down circuitry to protect the IC from fault conditions.
When the inductor current exceeds the current limit (2A
for the MAX8625A), the converter immediately enters
phase 3 and an internal 100ms timer starts. The con-
verter continues to commutate through the three phas-
es, spending most of its time in phase 1 and phase 3. If
the overcurrent event continues and the output is out of
regulation for the duration of the 100ms timer, the IC
enters shutdown mode and the output latches off. ON
must then be toggled to clear the fault. If the overload
is removed before the 100ms timer expires, the timer is
cleared and the converter resumes normal operation.
The thermal-shutdown circuitry disables the IC switching
if the die temperature exceeds +165°C. The IC begins
soft-start once the die temperature cools by 15°C.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8625AEVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVAL BD FOR MAX8625A - Boxed Product (Development Kits) |
| MAX8625EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY SEAMLESS TRANSITIO - Boxed Product (Development Kits) |
| MAX8627ETD+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 14TDFN EP - Rail/Tube |
| MAX8627ETD+T | 功能描述:直流/直流开关转换器 20uA 1MHz Synch Boost Converter 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 |
| MAX8627EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW VBATT 20+A IQ 1MHZ SYNCHRONO - Rail/Tube |
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