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参数资料
| 型号： | MAX618EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.5A 16QSOP |
| 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： | 可调至 28V |
| 输入电压： | 3 V ~ 28 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 250kHz |
| 电流 - 输出： | 500mA |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
28V, PWM, Step-Up DC-DC Converter
VL can be overdriven by an external supply between
2.7V and 5.5V. In systems with +3.3V or +5V logic
power supplies available, improve efficiency by power-
ing VL and V IN directly from the logic supply as shown
in Figure 3.
Operating Configurations
The MAX618 can be connected in one of three configura-
tions described in Table 2 and shown in Figures 1, 3, and
4. The VL linear regulator allows operation from a single
supply between +3V and +28V as shown in Figure 1.
Table 2. Input Configurations
The circuit in Figure 3 allows a logic supply to power
the MAX618 while using a separate source for DC-DC
conversion power (inductor voltage). The logic supply
(between 2.7V and 5.5V) connects to VL and IN. VL =
IN; voltages of 3.3V or more improve efficiency by pro-
viding greater gate drive for the internal MOSFET.
The circuit in Figure 4 allows separate supplies to
power IN and the inductor voltage. It differs from the
connection in Figure 3 in that the MAX618 chip supply
is not limited to 5.5V.
CIRCUIT
CONNECTION
V IN
RANGE
INDUCTOR
VOLTAGE
BENEFITS/COMMENTS
? Single-supply operation.
Figure 1
Input voltage connects
to IN and inductor.
3V to V OUT
(up to 28V)
V IN
? SHDN must be connected to or pulled up to VL. On/off
control requires an open-drain or open-collector connection
to SHDN.
? Increased efficiency.
Figure 3
IN and VL connect
together. Inductor volt-
age supplied by a
separate source.
2.7V to 5.5V
0 to V OUT
(up to 28V)
? SHDN can be driven by logic powered from the supply con-
nected to IN and VL, or can be connected to or pulled up to
VL.
? Input power source (inductor voltage) is separate from the
MAX618’s bias (V IN = VL) and can be less than or greater
than V IN .
? Input power source (inductor voltage) is separate from the
Figure 4
IN and inductor volt-
age supplied by sepa-
rate sources.
3V to 28V
0 to V OUT
(up to 28V)
MAX618’s bias (V IN ) and can be less than or greater than
V IN .
? SHDN must be connected to or pulled up to VL. On/off
control requires an open-drain or open-collector connection
to SHDN.
V IND
UP TO 28V
C IND
L
V IND
UP TO 28V
C IND
L
1 μ F
IN
2.7V TO 5.5V
IN
MAX618
LX
C OUT
OUT
UP TO 28V
IN
3V TO 28V
1 μ F
IN
MAX618
LX
C OUT
OUT
UP TO 28V
SHDN
R1
SHDN
PGND
R1
PGND
4.7 μ F
VL
FB
4.7 μ F
VL
FB
C COMP
COMP
GND
C P
R2
C COMP
COMP
GND
C P
R2
Figure 3. Dual-Supply Operation (V IN = 2.7V to 5.5V)
Figure 4. Dual-Supply Operation (V IN = 3V to 28V)
8
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