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| 型号： | MAX685ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11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
TO V OUT-
POK
V DD
VP
MAX685
NEGATIVE
TO V OUT+
FBN
ERROR
AMP
P
LXP
D1
V OUT-
FBP
REF
POSITIVE
ERROR
AMP
1.25V
REF
GND
CONTROL
LOGIC
N
PGND
LXN
D2
V OUT+
SYNC
SEQ
SHDN
Figure 1. Functional Diagram
output is within 90% of its regulation point. The power-
OK output (POK) indicates that both output voltages
LXN
+15V
0V
+5V
are in regulation. When both outputs are within 90% of
their regulation points, POK becomes high impedance.
Should one or both of the output voltages fall below
90% of their regulation points, POK pulls to ground.
POK can sink up to 2mA. To reduce current consump-
tion, POK is high impedance while the part is in shut-
down. When coming out of shutdown, POK remains
LXP
0V
-7.5V
high impedance for 50ns (typ) before going low.
Connect POK to V DD through a 100k ? resistor.
Synchronization/Internal
Frequency Selection
Figure 2. LXN and LXP Waveforms (see also Figure 5)
The current into the LXN pin is sensed to measure the
inductor current. The MAX685 controls the inductor cur-
rent to regulate both the positive and negative output
voltages.
SEQ and Power OK (POK)
The SEQ pin controls the power-up sequence. If SEQ is
low, the positive output is disabled until the negative
output is within 90% of its regulation point. If SEQ is
high, the negative output is disabled until the positive
The MAX685 operates at a fixed switching frequency.
Set the operating frequency using the SYNC pin. If
SYNC is grounded, the part operates at the internally set
220kHz frequency. When SYNC is connected to V DD ,
the part operates at 400kHz. The MAX685 can also be
synchronized to signals between 200kHz and 480kHz.
Note that each output switches at half the oscillator or
synchronized frequency. Since the actual switching fre-
quency is one-half the applied clock signal, drive SYNC
at twice the desired switching frequency.
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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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