参数资料
| 型号： | MAX1801EKA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR DC-DC SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，数字式相机 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
Digital Camera Step-Up Slave
DC-DC Controller
V BATT
C IN
10 μ F
L
2.2 μ H
MBRO520L
C OUT
47 μ F
V OUT
MAX1800
OR
3.3V
IN
MAX1801
DL
FDN337N
R1
OSC
FB
MAX1802
1.25V
REF
COMP
R C
10k
R2
R3
DCON
GND
C C
1000pF
R4
Figure 1. Typical Application Circuit
Detailed Description
Master-Slave Configuration
The MAX1801 is a step-up slave DC-DC controller that
obtains its input power, voltage reference, and oscilla-
tor signal directly from a MAX1800 or MAX1802 master
DC-DC converter (Figure 1). The master-slave configu-
ration reduces system cost by eliminating redundant
circuitry and controls the harmonic content of noise by
synchronizing converter switching.
Step-Up DC-DC Controller
The MAX1801 controller operates in a low-noise fixed-
frequency PWM mode, with output power limited by the
external components. The controller regulates the out-
put voltage by modulating the pulse width of the drive
signal for an external N-channel MOSFET switch. The
user-adjusted switching frequency is constant (100kHz
to 1MHz) and set by the master converter.
Figure 2 shows a block diagram of the MAX1801 PWM
controller. A sawtooth oscillator signal from the master
converter (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 waveform
voltage rises above the voltage at 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, increasing the loop gain for
improved regulation accuracy and compensation con-
trol.
Reference
The MAX1801 requires a 1.25V reference voltage that
is obtained from the MAX1800 or the MAX1802. REF
typically sinks 0.5μA in shutdown mode, 3μA in active
mode, and up to 30μA during startup. If multiple
MAX1801 controllers are turned on simultaneously,
ensure that the master voltage reference can provide
sufficient current, or buffer the reference with an appro-
priate unity-gain amplifier.
_______________________________________________________________________________________
7
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1802EHJ+ | IC PWR SPLY STEP DOWN 32-TQFP |
| MAX1804EUB+ | IC FEEDBACK INTERGRATOR 10UMAX |
| MAX1806EUA18+ | IC REG LDO 1.8V/ADJ .5A 8-UMAX |
| MAX1809ETI+ | IC DDR TERMINATION 28-TQFN |
| MAX1810ESA | IC REG SMART CARD NETWORK 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1802EHJ | 功能描述:直流/直流开关转换器 Step-Up Slave DC/DC Controller 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 |
| MAX1802EHJ+ | 功能描述:直流/直流开关转换器 Step-Up Slave DC/DC Controller 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 |
| MAX1802EHJ+T | 功能描述:直流/直流开关转换器 Step-Up Slave DC/DC Controller 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 |
| MAX1802EHJ-T | 功能描述:直流/直流开关转换器 Step-Up Slave DC/DC Controller 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 |
| MAX1804EUB | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。