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参数资料
| 型号： | MAX685ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ 10MA 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | -9 V ~ 24 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 220kHz，400kHz |
| 电流 - 输出： | 10mA |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
Dual-Output (Positive and Negative),
DC-DC Converter for CCD and LCD
Applications Information
Figure 3 shows the standard application circuit for the
MAX685. The values shown in Table 1 will work well for
output currents up to 10mA. However, this circuit can
be optimized to a particular application by using differ-
ent capacitors and a different inductor.
Higher Output Voltages
If the application requires output voltages greater than
-7.5V or +24V, use the circuit of Figure 4. This circuit
uses a charge pump to increase the output voltage
without increasing the voltage stress on the LX_ pin.
The maximum output voltages of the circuit in Figure 4
are -15V and +48V.
The voltage rating on D2, D5, and D6 must be 30V or
greater. For a larger negative output voltage without a
larger positive output (or vice versa), use one-half of
the Figure 4 circuit with one-half of the Figure 3 circuit.
Inductor Selection
A 22μH inductor is suitable for most applications.
Larger inductances will reduce inductor ripple current
and output voltage ripple, but they also typically require
larger physical size if increased resistance and losses
are not also allowed.
V IN
Small inductors are typically preferred because of
compact design and low cost. Murata LHQ and
TDK NLC types are examples of small surface-mount
inductors that work for most applications. Because these
small-size inductors use thinner wire, they exhibit higher
resistance and have greater losses than larger ones. If
the application demands higher efficiency, use larger,
lower resistance coils such as the Sumida CD43 or CD54,
Coilcraft DT1608 or DO1608, or Coiltronics UP1V series.
Filter Capacitor Selection
The output ripple voltage is a function of the peak in-
ductor current, frequency, and type and value of the
output capacitors. Capacitors with low equivalent-
series resistance (ESR) and large capacitance reduce
output ripple. Typically, tantalum or ceramic capacitors
are optimal. Tantalum capacitors have higher ESR and
higher capacitance than ceramic capacitors. Therefore
the ESR of tantalum capacitors determines the output
ripple, because at the frequencies used the ESR domi-
nates the impedance of the capacitor. If ceramic
capacitors are used, the capacitance determines the
output ripple.
V IN
C1
10 μ F
R5
100k
C1
10 μ F
R5
100k
C2
0.22 μ F
REF VP
V DD POK
POK
C2
0.22 μ F
REF VP
V DD POK
POK
R4
124k
FBN
MAX685 SHDN
SYNC
FBP
SHDN
SYNC
R4
FBN
MAX685 SHDN
SYNC
FBP
SHDN
SYNC
R3
750k
LXP GND PGND LXN
R1
1.0M
C5
47pF
R2
90.9k
R3
C6
1 μ F
LXP GND PGND LXN
C8
1 μ F
R1
C5
47pF
R2
-7.5V
V OUT-
+15V
V OUT+
V OUT-
V OUT+
C3
2.2 μ F
D1
MBR0520
L1
22 μ H
D2
MBR0520
C4
2.2 μ F
C7
2.2 μ F
D3
D4
C3
2.2 μ F
D1
L1
22 μ H
D2
C4
2.2 μ F
D5
D6
C9
2.2 μ F
Figure 3. Standard Application Circuit
Figure 4. Circuit for Output Voltages < -9V and > +24V
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX685ETG+ | 功能描述:直流/直流开关转换器 DC/DC Converter for CCD & LCD RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX685ETG+T | 功能描述:直流/直流开关转换器 DC/DC Converter for CCD & LCD RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX685ETG-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX685EUE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX685EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX685 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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