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| 型号： | MAX5025EUT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 40MA SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4.5 V ~ 36 V |
| 输入电压： | 4.5 V ~ 11 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 40mA |
| 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： | SOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-6 |
| 产品目录页面： | 1411 (CN2011-ZH PDF) |
| 其它名称： | MAX5025EUT+TDKR |
500kHz, 36V Output, SOT23,
Step-Up DC-DC Converters
Pin Description
PIN
MAX5025/
MAX5026
1
2
3
—
4
5
6
MAX5027/
MAX5028
1
2
—
3
4
5
6
NAME
PGND
GND
FB
FB
SHDN
V CC
LX
FUNCTION
Power Ground. Connect directly to local ground plane. Use a star ground configuration
for low noise.
Ground. Connect directly to local ground plane.
Feedback Pin. Reference voltage is approximately 1.25V. Connect resistive-divider tap
here. Minimize trace area at FB. See Setting the Output Voltage section.
Feedback Pin. Connect V OUT to FB for +30V. Internal resistors divide down the output
voltage.
Shutdown Pin. Connect to V CC to enable device. Connect to GND to shut down.
Input Supply Voltage. Bypass with a 4.7μF ceramic capacitor.
Drain of Internal 40V N-Channel DMOS. Connect inductor/diode to LX. Minimize trace
area at this pin to keep EMI down.
Detailed Description
The MAX5025 –MAX5028 current-mode PWM con-
trollers operate in a wide range of DC-DC conversion
applications including boost, flyback, and isolated out-
put configurations. These converters provide low-
noise, high output voltages making them ideal for var-
actor diode tuning applications as well as TFT LCD
bias. Other features include shutdown, fixed 500kHz
PWM oscillator, and a wide input range: 3V to 11V for
MAX5026/MAX5028 and 4.5V to 11V for MAX5025/
MAX5027.
The MAX5025 –MAX5028 operate in discontinuous
mode in order to reduce the switching noise at the out-
put. Other continuous mode boost converters generate
a large voltage spike at the output when the LX switch
turns on because there is a conduction path between
the output, diode, and switch to ground during the time
needed for the diode to turn off.
To reduce the output noise even further, the LX switch
turns off by taking 40ns typically to transition from “ON”
to “OFF.” As a consequence, the positive slew rate of
the LX node is reduced and the current from the induc-
tor does not “force ” the output voltage as hard as
would be the case if the LX switch were to turn off more
quickly.
PWM Controller
The heart of the MAX5025 –MAX5028 current-mode
PWM controllers is a BiCMOS multi-input comparator
that simultaneously processes the output-error signal
and switch current signal. The main PWM comparator
is direct summing, lacking a traditional error amplifier
and its associated phase shift. The direct summing
configuration approaches ideal cycle-by-cycle control
over the output voltage since there is no conventional
error amp in the feedback path.
The device operates in PWM mode using a fixed-fre-
quency, current-mode operation. The current-mode
feedback loop regulates peak inductor current as a
function of the output error signal.
SHDN Input
The SHDN pin provides shutdown control. Connect
SHDN to V CC for normal operation. To disable the
device, connect SHDN to GND.
Design Procedure
The MAX5025–MAX5028 can operate in a number of
DC-DC converter configurations including step-up, sin-
gle-ended primary inductance converter (SEPIC), and
flyback. The following design discussions are limited to
step-up, with a complete circuit shown in the
Application Circuits section.
Setting the Output Voltage
The output voltage of the MAX5027/MAX5028 is fixed
at 30V. The output voltage of the MAX5025/MAX5026 is
set by two external resistors (R1 and R2, Figure 2 and
Figure 3). First select the value of R2 in the 5k Ω to
50k Ω range. R1 is then given by:
8
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