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參數(shù)資料
| 型號： | MAX1724EZK27 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5 |
| 中文描述： | 1.5uA智商，升壓型DC - DC轉(zhuǎn)換器，在薄型SOT23 - 5 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 292K |
| 代理商： | MAX1724EZK27 |
For most applications, the peak inductor current equals
the current limit. However, for applications using large
inductor values or low input voltages, the maximum on-
time limits the peak inductor current (see
Inductor
Selection
section).
Capacitor Selection
Choose input and output capacitors to supply the input
and output peak currents with acceptable voltage rip-
ple. The input filter capacitor (C
IN
) reduces peak cur-
rents drawn from the battery and improves efficiency.
Low equivalent series resistance (ESR) capacitors are
recommended. Ceramic capacitors have the lowest
ESR, but low ESR tantalum or polymer capacitors offer
a good balance between cost and performance.
Output voltage ripple has two components: variations
in the charge stored in the output capacitor with each
LX pulse, and the voltage drop across the capacitor
’
s
ESR caused by the current into and out of the capaci-
tor:
where I
PEAK
is the peak inductor current (see
Inductor
Selection
section). For ceramic capacitors, the output
voltage ripple is typically dominated by V
RIPPLE(C)
. For
example, a 10μF ceramic capacitor and a 10μH induc-
tor typically provide 75mV of output ripple when step-
ping up from 3.3V to 5V at 50mA. Low input-to-output
voltage differences (i.e. two cells to 3.3V) require high-
er output capacitor values.
Capacitance and ESR variation of temperature should
be considered for best performance in applications
with wide operating temperature ranges. Table 2 lists
suggested capacitors and suppliers.
PC Board Layout Considerations
Careful PC board layout is important for minimizing
ground bounce and noise. Keep the IC
’
s GND pin and
the ground leads of the input and output capacitors
less than 0.2in (5mm) apart using a ground plane. In
addition,
keep
all
(MAX1722/MAX1723 only) and LX as short as possible.
connections
to
FB
V
V
V
V
V
L
V
V
C
)
I
RIPPLE
RIPPLE C
≈
)
RIPPLE ESR
RIPPLE ESR
RIPPLE C
OUT
BATT
OUT
=
+
R
≈
(
(
)
)
)
PEAK
ESR COUT
PEAK
I
OUT
-
-
2
1
2
2
M
1.5μA I
Q
, Step-Up DC-DC Converters
in Thin SOT23-5
10
______________________________________________________________________________________
Table 2. Suggested Surface-Mount Capacitors and Manufacturers (C1 and C2)
MANUFACTURER
CAPACITOR
VALUE
DESCRIPTION
PHONE
WEBSITE
1
μ
F to 10
μ
F
X7R Ceramic
AVX
10
μ
F to 330
μ
F
TAJ Tantalum Series
TPS Tantalum Series
843-448-9411
www.avxcorp.com
1
μ
F to 22
μ
F
10
μ
F to 330
μ
F
68
μ
F to 330
μ
F
X5R/X7R Ceramic
T494 Tantalum Series
T520 Tantalum Series
Kemet
864-963-6300
www.kemet.com
Sanyo
33
μ
F to 330
μ
F
TPC Polymer Series
408-749-9714
www.secc.co.jp
Taiyo Yuden
33
μ
F to 330
μ
F
X5R/X7R Ceramic
800-368-2496
www.t-yuden.org
TDK
1
μ
F to 10
μ
F
X7R Ceramic
847-803-6100
www.tdk.com
Vishay Sprague
10
μ
F to 330
μ
F
594D Tantalum Series
595D Tantalum Series
203-452-5664
www.vishay.com
Chip Information
TRANSISTOR COUNT: 863
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1724EZK27-T | 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5 |
| MAX1722 | Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP -40 to 85 |
| MAX1722EZK | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0 |
| MAX1723 | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0 |
| MAX1723EZK | Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP 0 to 0 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1724EZK27+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 5PIN TSOT-23 - Rail/Tube |
| MAX1724EZK27+T | 功能描述:直流/直流開關轉(zhuǎn)換器 1.5uA IQ Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| MAX1724EZK27-T | 功能描述:直流/直流開關轉(zhuǎn)換器 1.5uA IQ Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| MAX1724EZK30 | 制造商:Maxim Integrated Products 功能描述:1.5UA IQ STEP-UP DC-DC CONVERTERS - Rail/Tube |
| MAX1724EZK30+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 5PIN TSOT-23 - Rail/Tube |
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