參數(shù)資料
型號(hào)： MAX863EEE
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： Dual, High-Efficiency, PFM, Step-Up DC-DC Controller
中文描述： DUAL SWITCHING CONTROLLER, PDSO16
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-16
文件頁(yè)數(shù)： 7/16頁(yè)
文件大小： 194K
代理商： MAX863EEE
M
Dual, High-Effic ienc y, PFM, S tep-Up
DC-DC Controller
_______________________________________________________________________________________
7
Continuous/Disc ontinuous-Conduc tion
Modes
Each converter in the MAX863 determines from moment
to moment whether to switch or not, waiting until the out-
put voltage drops before initiating another cycle. Under
light loads, the inductor current ramps to zero before the
next cycle; this is discontinuous-conduction mode.
Continuous-conduction mode occurs when the next
switching cycle begins while current is still flowing
through the inductor. The transition point between dis-
continuous- and continuous-conduction mode is deter-
mined by input and output voltages, and by the size of
the inductor relative to the peak switching current. In
general, reducing inductance toward the minimum rec-
ommended value pushes the transition point closer to
the maximum load current. If the inductor value is low
enough or the output/input voltage ratio high enough,
the DC-DC converter may remain in discontinuous-con-
duction mode throughout its entire load range.
The MAX863 transitions into continuous-conduction
mode in two ways, depending on whether preset or
adjustable mode is used and how the external feed-
back network is compensated. Under light loads, the IC
switches in single pulses (Figure 3a). The threshold of
transition into continuous-conduction mode is reached
when the inductor current waveforms are adjacent to
one another, as shown in Figure 3b. As the load
increases, the transition into continuous-conduction
mode progresses by raising the minimum inductor cur-
rent (Figures 3c, 3d). Depending on feedback compen-
sation, transition into continuous-conduction mode may
also progress with grouped pulses (Figures 3e, 3f).
Pulse groups should be separated by less than two or
three switching cycles. Output ripple should not be
significantly more than the single-cycle no-load case.
MAX863
EXT2
CS2
V
OUT2
= 3.3V
V
OUT1
= 5V
V
IN
= 1.5V TO THE LOWER OF V
OUT1
OR V
OUT2
N1B
IRF7301
C7
0.1
μ
F
R4
100k
1%
C6
10pF
C5
330
μ
F
10V
≤
0.1
R2
50m
R3
165k
1%
N1A
R1
50m
R7
100k
C1
220
μ
F
10V
≤
0.1
R5
R6
C2
0.1
μ
F
D1
MBRS340T3
D2
MBRS340T3
L1
10
μ
H
2A
L2
10
μ
H
2A
C3
100
μ
F
10V
≤
0.1
C4
100
μ
F
10V
≤
0.1
ON/OFF
FB2
SHDN1
EXT1
CS1
LBO
LOW-BATTERY
DETECTOR OUTPUT
LBI
SENSE1
V
DD
PGND
BOOT
GND
FB1
SHDN2
REF
Figure 2. Bootstrapped Typical Operating Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX863EEE+ 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual PFM Step-Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX863EEE+T 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual PFM Step-Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX863EEE-T 功能描述:DC/DC 開(kāi)關(guān)控制器 Dual PFM Step-Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX863EVKIT 功能描述:DC/DC 開(kāi)關(guān)控制器 Evaluation Kit for the MAX863 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX8640EVKIT 制造商:Maxim Integrated Products 功能描述:500MA 4MHZ/2MHZ SYNCHRONOUS STEP-D - Rail/Tube
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