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參數(shù)資料
| 型號(hào)： | MAX1708 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類(lèi)： | DC/DC變換器 |
| 英文描述： | High-Frequency, High-Power, Low-Noise, Step-Up DC-DC Converter |
| 中文描述： | 高頻、大功率、低噪聲、升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 332K |
| 代理商： | MAX1708 |
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M
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
______________________________________________________________________________________
11
__________________Design Procedure
Inductor Selection (L1)
The MAX1708
’
s high switching frequency allows the
use of a small-size inductor. Use a 2.2μH inductor for
600kHz operation. If the MAX1708 is synchronized at a
different frequency, scale the inductor value with the
inverse of frequency (L
1
= 2.2μH
600kHz / f
SYNC
).
The PWM design tolerates inductor values within ±25%
of this calculated value, so choose the closest standard
inductor value. For example, use 3.3μH for 350kHz and
1.5μH for 1MHz).
Inductors with a ferrite core or equivalent are recom-
mended; powder iron cores are not recommended for
use at high switching frequencies. Ensure the induc-
tor
’
s saturation rating (the current at which the core
begins to saturate and inductance falls) exceeds the
internal current limit. Note that this current may be
reduced through SS/LIM if less than the MAX1708
’
s full
load current is needed (see
Electrical Characteristics
for ratings). For highest efficiency, use a coil with low
DC resistance, preferably under 20m
. To minimize
radiated noise, use a toroid, pot core, or shielded
inductor. See Tables 3 and 4 for a list of recommended
components and component suppliers. To calculate
the maximum output current (in amperes), use the fol-
lowing equation:
where:
V
IN
= input voltage
V
D
= forward voltage drop of the Schottky diode
at I
LIM
V
OUT
= output voltage
D' = (V
IN
) / (V
OUT
+ V
D
), neglecting switch voltage
drop
f = switching frequency
L1 = inductor value
I
LIM
= minimum value of switch current limit from
Electrical Characteristics
or set by R1 of
Figure 1.
I
D I
'
D
V
V
V
L
OUT MAX
(
LIM
OUT
D
IN
)
'
=
+
× ×
1
2
SUPPLIER
Central
Coilcraft
Coiltronics
Motorola
Panasonic
PHONE
631-435-1110
847-639-6400
561-241-7876
602-303-5454
714-373-7939
FAX
631-435-1824
847-639-1489
561-241-9339
602-994-6430
714-373-7183
Table 4. Component Suppliers
Table 3. Component Selection Guide
PRODUCTION
INDUCTORS
CAPACITORS
DIODES
Coiltronics UP2B-2R2
Coilcraft DO3316P-222HC
Sanyo 6TPC100M
Panasonic EEFUE0J151R
Motorola MBRD1035CTL
Central CMSH5-20
Surface mount
Figure 3. Simplified PWM Controller Functional Diagram
N
R
S
Q
LX
PGND
11m
REF
SLOPE
COMP
FB
SS/LIM
12.5
OSCILLATOR
(LIMITED TO 100mV)
Figure 4. Adjustable Output Voltage
R4
R3
KEEP SHORT
FB
V
IN
V
OUT
LX
MAX1708
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| MAX17080EVKIT+ | 功能描述:電源管理IC開(kāi)發(fā)工具 MAX17080 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX17080GTL+ | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Integrated Circuits (ICs) Voltage Regulators - Special Purpose - IC CONTROLLER AMD SVI 40-TQFN RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX17080GTL+T | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Integrated Circuits (ICs) Voltage Regulators - Special Purpose - IC CONTROLLER AMD SVI 40-TQFN RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX17081EVKIT+ | 功能描述:電源管理IC開(kāi)發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX17081EWV+ | 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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