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| 型号： | MAX1802EHJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC PWR SPLY STEP DOWN 32-TQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 360 |
| 应用： | 控制器，数字式相机 |
| 输入电压： | 2.5 V ~ 11 V |
| 输出数： | 5 |
| 输出电压： | 1.25 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-TQFP |
| 供应商设备封装： | 32-TQFP（5x5） |
| 包装： | 托盘 |
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Digital Camera Step-Down
Power Supply
OSC
CLOCK
V REF
REFERENCE
REF
GENERATOR
100ns
CLK
ONE-SHOT
CLK
VH
VH
COMPM
FBM
MAIN
VDDM
DHM
CURRENT-MODE DC-DC
LXM
CONTROLLER
DLM
ONM
SOFT-START
V REF
CLK
2.4V
VL LDO
PGNDM
VL
GND
COMPC
FBC
CORE
CURRENT MODE
VDDC
DC-DC
CONTROLLER
LXC
ONC
V REF
SOFT-START
PGND
Figure 2. Simplified Block Diagram, Including Main and Core
V COMPC ( MAX ) ? V REF ? 1 + OUT VSWC ?
Core DC-DC Converter
The MAX1802 core step-down DC-DC converter gener-
ates a 1.25V to 5.5V output voltage from the main con-
troller output. The core converter has the same
low-noise, constant-frequency PWM current-mode
architecture as the main controller. However, it uses an
I LIM =
? V A ?
? V IN ?
R CSC
? ? 1 ? OUT ? V OUT ?
I OUT ( MAX ) = I LIM ? ??
?
?
?
?
?
internal P-channel MOSFET power switch and N-chan-
nel MOSFET synchronous rectifier to maximize efficien-
cy and reduce circuit size and external component
count. The core converter internally monitors the induc-
tor current for current-mode regulation of the output
voltage, as well as overload protection, automatic Idle
Mode switchover, and turning off the synchronous recti-
fier when the inductor current approaches zero. By
switching to Idle Mode at light loads and turning the
synchronous rectifier off at zero current, light-load effi-
ciency is improved. The core converter is inactive until
the main output has started.
The voltage at COMPC is typically clamped to
V COMPC(MAX) = 2.14V, thereby limiting the inductor
current. The peak inductor current limit (I LIM ) and the
maximum average output current (I OUT(MAX) ) are
determined by the following equations:
? ? V ? ?
? V IN ? ?
2 f OSC L
? ?
where A VSWC is the core slope compensation gain
(0.20V/V), R CSC is the transresistance of the core cur-
rent-sense amplifier (1V/A), and L is the inductor value.
Note that the current limit increases as the input/output
ratio increases.
Auxiliary DC-DC Controllers
The MAX1802 ’ s three auxiliary controllers operate in a
low-noise, fixed-frequency, PWM mode with output
power limited by the external components. The con-
16
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相关代理商/技术参数 |
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|---|---|
| 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 |
| MAX1804EUB+ | 功能描述:电流和电力监控器、调节器 Feedback Integrator for Power Supply 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 |
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