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参数资料
| 型号： | MAX1837EUT50#TG16 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 0.25A SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.5 V ~ 24 V |
| 电流 - 输出： | 250mA |
| 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： | 带卷 (TR) |
| 供应商设备封装： | SOT-6 |
24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
INPUT
4.5V OR 24V
C IN
IN
SHDN
LX
D1
L1
OUTPUT
3.3V OR 5V
C OUT
V SENSE
OUT
R
Q
MAXIMUM
FB
S
Q
OFF-TIME
DELAY
TRIG
100mV
V SET
Q
TRIG
MAXIMUM
ON-TIME
DELAY
1.25V
GND
MAX1836
MAX1837
Figure 3. Functional Diagram
When the output voltage is too low, an error comparator
sets a flip-flop, which turns on the internal p-channel
MOSFET and begins a switching cycle (Figure 3). As
shown in Figure 4, the inductor current ramps up linear-
ly, charging the output capacitor and servicing the
load. The MOSFET turns off when the current limit is
reached, or when the maximum on-time is exceeded
10V
0
A
while the output voltage is in regulation. Otherwise, the
MOSFET remains on, allowing a duty cycle up to 100%
to ensure the lowest possible dropout voltage. Once
the MOSFET turns off, the flip-flop resets, diode D1
turns on, and the current through the inductor ramps
back down, transferring the stored energy to the output
capacitor and load. The MOSFET remains off until the
0.5μs minimum off-time expires and the inductor cur-
rent ramps down to zero, and the output voltage drops
back below the set point.
3.3V
500mA
0
4 μ s/div
CIRCUIT OF FIGURE 2, V IN = 12V
A. V LX , 5V/div
B. V OUT = 3.3V, 20mV/div, 200mA LOAD
C. INDUCTOR CURRENT, 500mA/div
B
C
Figure 4. Discontinuous-Conduction Operation
8
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