參數(shù)資料
型號(hào)： MAX1802EHJ
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Digital Camera Step-Down Power Supply
中文描述： 0.75 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQFP32
封裝： 5 X 5 MM, 1 MM HEIGHT, TQFP-32
文件頁(yè)數(shù)： 16/28頁(yè)
文件大?。?/td> 469K
代理商： MAX1802EHJ
M
Digital Camera Step-Down
Power Supply
16
______________________________________________________________________________________
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
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:
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-
I
V
V
V
A
V
R
I
I
V
V
f
V
L
LIM
COMPC MAX
REF
OUT
VSWC
IN
CSC
OUT MAX
(
LIM
OUT
IN
2
OUT
OSC
=
+
=
(
)
)
1
1
OSC
COMPM
FBM
ONM
COMPC
FBC
ONC
SOFT-START
V
REF
V
REF
V
REF
SOFT-START
PGND
LXC
VDDC
GND
VL
PGNDM
DLM
LXM
DHM
VDDM
VH
REF
REFERENCE
VH
MAIN
CURRENT-MODE DC-DC
CONTROLLER
VL LDO
CLK
CLK
100ns
ONE-SHOT
CLK
2.4V
CORE
CURRENT MODE
DC-DC
CONTROLLER
CLOCK
GENERATOR
Figure 2. Simplified Block Diagram, Including Main and Core
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
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
MAX1804EUB+ 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 Feedback Integrator for Power Supply 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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