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参数资料
| 型号： | MAX1802EHJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/28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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页当前第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
Digital Camera Step-Down
Power Supply
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
FBM
COMPM
ONM
VH
VDDM
DHM
LXM
DLM
PGNDM
OSC
DCON1
DL1
ON1
COMP1
FB1
FB2
FUNCTION
Main DC-DC Converter Feedback Input. Connect a feedback resistive voltage-divider from the output
to FBM to set the main output voltage. Regulation voltage is V REF (1.25V).
Compensation for Main Controller. Output of main transconductance error amplifier. Connect a series
resistor and capacitor to GND to compensate the main control loop (see Compensation Design ).
Main Converter Enable Input. High level turns on the main converter and VL regulator. Connect ONM
to VDDM to automatically start the converter. When the main converter is off, all other outputs are
disabled.
Internal Bias Voltage. VH provides bias to the main controller. Bypass VH to VDDM with a 0.1μF or
greater ceramic capacitor.
Battery Input. VDDM supplies power to the IC and also serves as a high-side current-sense input
for the main DC-DC controller. Connect VDDM as close as possible to the source of the external
P-channel switching MOSFET for the main controller.
External P-Channel MOSFET Gate-Drive Output for Main Controller. DHM swings between VDDM and
PGNDM with 400mA (typ) drive current. Connect DHM to the gate of the external P-channel switching
MOSFET for the main controller.
Main DC-DC Controller Current-Sense Input. Connect LXM to the drains of the external P- and N-
channel switching MOSFETs for the main converter. LXM serves as the current-sense input for both
P- and N-channel switching MOSFETs. Connect LXM as close as possible to the drain of the external
P-channel switching MOSFET for the main controller.
External N-Channel MOSFET Gate-Drive Output for Main Controller. DLM swings between VDDM
and PGNDM with 400mA (typ) drive current. Connect DLM to the gate of the external N-channel
switching MOSFET for the main controller.
Power Ground for Main DC-DC Controller. PGNDM also serves as a low-side current-sense input for
the main DC-DC controller. Connect PGNDM as close as possible to the source of the external
N-channel switching MOSFET for the main controller.
Oscillator Control. Connect a timing capacitor from OSC to GND and a timing resistor from OSC to VL
to set the switching frequency between 100kHz and 1MHz (see Setting the Switching Frequency ).
Maximum Duty Cycle Control Input for Auxiliary Controller 1. Connect DCON1 to VL 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 300mV to turn the controller off.
External MOSFET Gate Drive Output for Auxiliary Controller 1. DL1 swings between VDDC and PGND
with 400mA (typ) 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 VL to automatically start auxiliary controller 1.
Compensation for Auxiliary Controller 1. Output of auxiliary controller 1 transconductance error
amplifier. Connect a series resistor and capacitor from COMP1 to GND to compensate the auxiliary
controller 1 control loop (see Compensation Design ).
Feedback Input for Auxiliary Controller 1. Connect a feedback resistive voltage-divider from the
output of auxiliary controller 1 to FB1 to set the output voltage. Regulation voltage is V REF (1.25V).
Feedback Input for Auxiliary Controller 2. Connect a feedback resistive voltage-divider from the
output of auxiliary controller 2 to FB2 to set the output voltage. Regulation voltage is V REF (1.25V).
12
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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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