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参数资料
| 型号： | MAX1800EHJ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | Digital Camera Step-Up Power Supply |
| 中文描述： | 2 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封装： | 5 X 5 MM, 1 MM HEIGHT, TQFP-32 |
| 文件页数： | 11/24页 |
| 文件大小： | 461K |
| 代理商： | MAX1800EHJ |
M
Digital Camera Step-Up
Power Supply
______________________________________________________________________________________
11
the output voltage. The controller forces the inductor cur-
rent to rise above the 300mA Idle Mode threshold to
ensure pulse skipping and improved efficiency at light
loads.
Auxiliary DC-DC Controllers
The MAX1800 auxiliary controllers operate in a low-noise,
fixed-frequency, PWM mode, with output power limited by
the external components. The controllers regulate their out-
put voltages by modulating the pulse width of the drive sig-
nal for an external N-channel MOSFET switch. The auxiliary
controllers are inactive until the main output has started.
Figure 3 shows a block diagram for a MAX1800 auxil-
iary PWM controller. A sawtooth oscillator signal at OSC
governs the internal timing. At the beginning of each
cycle, DL_ goes high to turn on the external MOSFET
switch. The MOSFET switch turns off when the internally
level-shifted sawtooth rises above COMP_ or when the
maximum duty cycle is exceeded. The switch remains
off until the beginning of the next cycle. An internal
transconductance amplifier establishes an integrated
error voltage at COMP_, thereby increasing the loop
gain for improved regulation accuracy.
D
Q
1
Q
2
EN
EN
Q
FB
EN
EN
ON
REF
V
REF
0.9V
REF
RDY
OSC
COMP
AUX1
AUX2
AUX3
IC POWER
2.35V
1.25V
POUT
POUT
LX
LX
PGND
PGND
STARTUP
OSCILLATOR
MAIN PWM
CONTROLLER
REFERENCE
GAIN
BLOCK
DCON1
ONM
REF
GND
OSC
FBM
COMPM
FB1
COMP1
OUT
FB2
COMP2
DCON2
FB3
COMP3
DCON3
AI
ON1
ON2
ON3
ONA
OSCILLATOR
UNDERVOLTAGE LOCKOUT
OSC
FB
EN
Q
COMP
DUTY
OSC
FB
EN
COMP
DUTY
OSC
FB
EN
EN
COMP
DUTY
Q
Q
N
P
N
DL1
DL2
DL3
AO
RDYM
MAX1800
Figure 2. Simplified Functional Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1800 | Digital Camera Step-Up Power Supply |
| MAX1806 | 3A Fixed Low Dropout Linear Regulator (LDO) |
| MAX1806EUA | 3A Fixed Low Dropout Linear Regulator (LDO) |
| MAX1806EUA08 | 3A Fixed Low Dropout Linear Regulator (LDO) |
| MAX1806EUA15 | 3A Fixed Low Dropout Linear Regulator (LDO) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX1801EKA+T | 功能描述:DC/DC 开关控制器 Step-Up Slave DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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