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| 型号： | MAX1790EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.8A 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： | 2.6 V ~ 12 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 640kHz, 1.22MHz |
| 电流 - 输出： | 1.2A |
| 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 Converters
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
MAX1790
MAX8715
Figure 2. Functional Diagram
Output-Current Capability
The output-current capability of the MAX1790/MAX8715
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 65% (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
Soft-Start
The MAX1790/MAX8715 can be programmed for soft-
start upon power-up with an external capacitor. When the
shutdown pin is taken high, the soft-start capacitor (C SS )
is immediately charged to 0.5V. Then the capacitor is
charged at a constant current of 4μA (typ). During this
time, the SS voltage directly controls the peak inductor
current, allowing 0A at V SS = 0.5V to the full current limit
at V SS = 1.5V. The maximum load current is available
after the soft-start cycle is completed. When the shut-
down pin is taken low, the soft-start capacitor is
discharged to ground.
Frequency Selection
The MAX1790/MAX8715s ’ frequency can be user
selected to operate at either 640kHz or 1.2MHz.
Connect FREQ to GND for 640kHz operation. For a
1.2MHz switching frequency, connect FREQ to IN. This
allows the use of small, minimum-height external com-
ponents while maintaining low output noise. FREQ has
an internal pulldown, allowing the user the option of
leaving FREQ unconnected for 640kHz operation.
Shutdown
The MAX1790/MAX8715 are shut down to reduce the
supply current to 0.1μA when SHDN is low. In this
mode, the internal reference, error amplifier, compara-
tors, and biasing circuitry turn off while the n-channel
MOSFET is turned off. The boost converter’s output is
connected to IN by the external inductor and catch
diode.
Applications Information
Boost DC-DC converters using the MAX1790/MAX8715
can be designed by performing simple calculations for
a first iteration. All designs should be prototyped and
tested prior to production. Table 1 provides a list of
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