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参数资料
| 型号： | MAX1800 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Digital Camera Step-Up Power Supply |
| 中文描述： | 数码相机升压型电源 |
| 文件页数： | 8/24页 |
| 文件大小： | 461K |
| 代理商： | MAX1800 |
M
Digital Camera Step-Up
Power Supply
8
_______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1, 19
PGND
Power Ground. Sources of internal N-channel MOSFET power switches. Connect both PGND pins to GND as
close to the IC as possible.
External MOSFET Gate Drive Output for Auxiliary Controller 1. DL1 swings between POUT and GND with
typical 500mA drive current. Connect DL1 to the gate of the external switching N-channel MOSFET for
auxiliary controller 1.
Enable Input for Auxiliary Controller 1. Connect ON1 to POUT to automatically start auxiliary controller 1.
Feedback Input for Auxiliary Controller 1. Connect a feedback resistive voltage-divider from the output to FB1
to set the output voltage. Regulation voltage is V
REF
(1.25V).
Compensation for Auxiliary Controller 1. Output of transconductance error amplifier. Connect a series resistor
and capacitor to GND to compensate the control loop. See
Compensation Design
.
Maximum Duty-Cycle Control Input for Auxiliary Controller 1. Connect to POUT to set the default maximum
duty cycle. Connect a resistive voltage-divider from REF to DCON1 to set the maximum duty cycle between
40% and 90%. Pull DCON1 below 400mV to turn the controller off.
Main Power Output. Source of P-channel MOSFET synchronous rectifier switch. Connect both POUT pins
together as close to the IC as possible.
External MOSFET Gate Drive Output for Auxiliary Controller 2. DL2 swings between POUT and GND with
typical 500mA drive current. Connect DL2 to the gate of the external switching N-channel MOSFET for
auxiliary controller 2.
Enable Input for Auxiliary Controller 2. Connect ON2 to POUT to automatically start auxiliary controller 2.
Feedback Input for Auxiliary Controller 2. Connect a feedback resistive voltage-divider from the output to FB2
to set the output voltage. Regulation voltage is V
REF
(1.25V).
Compensation for Auxiliary Controller 2. Output of transconductance error amplifier. Connect a series resistor
and capacitor to GND to compensate the control loop. See
Compensation Design
.
Maximum Duty-Cycle Control Input for Auxiliary Controller 2. Connect to POUT to set the default maximum
duty cycle. Connect a resistive voltage-divider from REF to DCON2 to set the maximum duty cycle between
40% and 90%. Pull DCON2 below 400mV to turn the controller off.
Internal Bias Supply Input. Connect to POUT through a resistor, and bypass OUT to GND with a capacitor.
See
Compensation Design
.
1.250V Reference Output. Bypass REF to GND with a 0.1μF or greater ceramic capacitor.
Analog Ground. Connect GND to PGND at a single point near the IC.
Oscillator Control. Connect a timing capacitor from OSC to GND and a timing resistor from OSC to POUT to
set the switching frequency between 100kHz and 1MHz. See
Setting the Switching Frequency
.
Main DC/DC Converter Feedback Input. Connect a feedback resistive voltage-divider from POUT to FBM to
set the output voltage. Regulation voltage is V
REF
(1.25V).
Compensation for Main Controller. Output of transconductance error amplifier. Connect a series resistor and
capacitor to GND to compensate the control loop. See
Compensation Design
.
Main Power Switching Node. Drains of the internal P-channel and N-channel MOSFET switches. Connect the
LX pins together as close to the IC as possible.
Main Converter Ready Output. An open-drain output sinks current when V
FBM
< 1.125V, indicating that the
main output is more than 10% out of regulation.
2
DL1
3
ON1
4
FB1
5
COMP1
6
DCON1
7, 22
POUT
8
DL2
9
ON2
10
FB2
11
COMP2
12
DCON2
13
OUT
14
15
REF
GND
16
OSC
17
FBM
18
COMPM
20,
21
LX
23
RDYM
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1800EHJ | 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 |
| MAX1800EHJ-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 |
| MAX1800EVKIT | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1801EKA | 制造商:Maxim Integrated Products 功能描述:DIGITAL CAMERA STEP-UP SLAVE DC-DC - Rail/Tube |
| MAX1801EKA+ | 制造商:Maxim Integrated Products 功能描述:DC DC CNTRLR SGL-OUT STEP UP 2.7V TO 5.5V 8PIN SOT-23 - Rail/Tube |
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