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參數(shù)資料
| 型號(hào)： | MAX1802 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Digital Camera Step-Down Power Supply |
| 中文描述： | 數(shù)碼相機(jī)降壓型電源 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大小： | 469K |
| 代理商： | MAX1802 |
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M
Digital Camera Step-Down
Power Supply
12
______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
FBM
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.
P ow er G ound for M ai n D C D C C ontr ol er P G N D M al so ser ves as a l ow si d e cur ent- sense i np ut for
the m ai n D C D C contr ol er C onnect P GN D M as cl ose as p ossi b e to the sour ce of the exter nal
N channel sw chi ng M OS FE T for the m ai n contr ol er
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
).
2
COMPM
3
ONM
4
VH
5
VDDM
6
DHM
7
LXM
8
DLM
9
PGNDM
10
OSC
11
DCON1
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
).
12
DL1
13
ON1
14
COMP1
15
FB1
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).
16
FB2
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| MAX1802EHJ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Step-Up Slave DC/DC Controller RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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| MAX1802EHJ+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Step-Up Slave DC/DC Controller RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1802EHJ-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Step-Up Slave DC/DC Controller RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1804EUB | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
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