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| 型号： | MAX17067EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.3A 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 18 V |
| 输入电压： | 2.6 V ~ 4 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 640kHz，1.2MHz |
| 电流 - 输出： | 300mA |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
Low-Noise Step-Up DC-DC Converter
SHDN
SKIP
COMPARATOR
4 μ A
IN
BIAS
COMP
SKIP
SOFT-
START
SS
ERROR
FB
1.24V
AMPLIFIER
∞
ERROR
COMPARATOR
CONTROL
AND DRIVER
N
LX
LOGIC
CLOCK
GND
FREQ
OSCILLATOR
SLOPE
COMPEN-
SATION
Σ
CURRENT
SENSE
5 μ A
Figure 2. Functional Diagram
MAX17067
IN Supply Clamp Circuit
The MAX17067 features an internal clamp to allow appli-
cations where there is overvoltage stress on the supply
line. In many cases, high-voltage spikes happen on pro-
duction lines and are difficult to protect against. The
MAX17067’s internal clamp circuit can solve this prob-
?
The external resistor causes a DC voltage drop in
the IN supply line. The voltage at the IN pin has to
be properly maintained when clamping is used. The
worst-case quiescent current of the IN pin is 2.5mA;
therefore, the worst-case voltage drop is 2.5mA
multiplied by R IN .
lem. The internal clamp circuit limits the voltage at the IN
pin to 6.4V (typ) to protect the IN pin from a continuous
or transient overvoltage stress condition on the supply
line. To use the clamp circuit, put a series resistor (R IN )
between supply and IN, and a decoupling capacitor
(1μF typical) from IN to GND. To properly size the exter-
nal resistor, several factors should be considered:
? The maximum current for the clamp is 40mA, and the
clamp voltage at the IN pin is 6.05V (min). Therefore,
the external resistor is:
R IN ≥ ?? ( V IN - 6 . 05 ) 0 . 04 ?? Ω
? Power dissipation in the clamp is in addition to the
total power loss.
Output-Current Capability
The output-current capability of the MAX17067 is a
function of current limit, input voltage, operating fre-
quency, and inductor value. Because of the slope com-
pensation used to stabilize the feedback loop, the duty
cycle affects the current limit. The output-current capa-
bility is governed by the following equation:
I OUT(MAX) = [I LIM x (1.26 - 0.4 x Duty) -
0.5 x Duty x V IN /(f OSC x L)] x η x V IN /V OUT
where:
I LIM = current limit specified at 68% (see the Electrical
Characteristics):
Duty = duty cycle = (V OUT - V IN + V DIODE )/
(V OUT - I LIM x R ON + V DIODE )
V DIODE = catch diode forward voltage at I LIM
η = conversion efficiency, 85% nominal
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