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參數(shù)資料
| 型號： | EN5335QI |
| 廠商： | ENPIRION INC |
| 元件分類： | 穩(wěn)壓器 |
| 中文描述： | SWITCHING REGULATOR, 5000 kHz SWITCHING FREQ-MAX, QCC44 |
| 封裝： | ROHS COMPLIANT, QFN-44 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 266K |
| 代理商： | EN5335QI |
00846
06/01/2010
Rev: F
EN5335QI
Enpirion 2010 all rights reserved, E&OE
www.enpirion.com
9
Z = ESR + ESL.
Placing output capacitors in parallel reduces the
impedance and will hence result in lower ripple
voltage.
n
Total
Z
1
...
1
2
1
+
=
Typical ripple versus capacitance is given below:
Output Capacitor
Configuration
Typical Output Ripple (mVp-p)
(as measured on EN5335QI
Evaluation Board)
1 x 47 uF
30
3 x 22 uF
15
Table 3. Recommended output capacitors.
Description
MFG
P/N
22uF, 6.3V, 10%
X5R, 1206
(3 capacitors needed)
Murata
Taiyo Yuden
GRM31CR60J226KE19L
JMK316BJ226KL-T
47uF, 10V, 10%
X5R, 1210
47uF, 6.3V, 10%
X5R, 1210
(1 capacitor needed)
Murata
AVX
GRM32ER61A476KE20L
12106D476KAT2A
Enable Operation
The ENABLE pin provides a means to shut down
the device, or enable normal operation. A logic
high will enable the converter into normal
operation. When the ENABLE pin is asserted,
the device will undergo a normal soft start. A
logic low will disable the converter and cause it to
shut down. When Enable goes low, circuitry
internal to the device continue to operate to
ensure the output voltage is gradually returned to
zero and the circuits turn off subsequently. A
short low going pulse on Enable is ignored.
Soft-Start Operation
Soft start is a method to reduce in-rush current
when the device is enabled. The output voltage
is ramped up slowly upon start-up.
The output
rise time is controlled by choice of a soft-start
capacitor, which is placed between the SS pin
(pin 37) and the AGND pin (pin 29).
Rise Time: TR = Css* 75K
During start-up of the converter, the reference
voltage to the error amplifier is gradually
increased from zero to its final level by an
internal current source of typically 10uA. Typical
soft-start rise time is 1mS to 3mS. The rise time
is measured from the time when AVIN > VUVLO
and the Enable signal crosses its logic high
threshold. Typical SS capacitor values are in the
range of 15nF to 50 nF.
Power-up Sequencing
The sequencing of AVIN, PVIN and ENABLE
should meet the following requirements:
1. ENABLE should not be asserted before PVIN.
2. PVIN should not be applied before AVIN.
Note that tying AVIN, PVIN and ENABLE
together and brought up at the same time does
meet these requirements.
POK Operation
The POK signal is an open drain signal from the
converter indicating the output voltage is within
the specified range. The POK signal will be a
logic high when the output voltage is within 90% -
120% of the programmed output voltage. If the
output voltage goes outside of this range, the
POK signal will be a logic low until the output
voltage has returned to within this range. In the
event of an over-voltage condition the POK
signal will go low and will remain in this condition
until the output voltage has dropped to 95% of
the programmed output voltage before returning
to the high state (see also: Over Voltage
Protection).
Over-Current Protection
The current limit function is achieved by sensing
the current flowing through the sense P-
MOSFET. When the sensed current exceeds the
current limit, both NFET and PFET switches are
turned off. If the over-current condition is
removed, the over-current protection circuit will
enable the PWM operation. This circuit is
designed to provide high noise immunity.
The nominal over current trip point is set to 4.5A.
It is possible to increase the over-current set
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EN5335QI-E | 功能描述:電源管理IC開發(fā)工具 3AMP MOD INT IND VID EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| EN5336QI | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3AMP BUCK CONVERTER 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 |
| EN5336QI-E | 功能描述:電源管理IC開發(fā)工具 3AMP MOD INT INDUC EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| EN5337QI | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3AMP BUCK CONVERTER DC-DC Conv, Int Ind 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 |
| EN5337QI-E | 功能描述:電源管理IC開發(fā)工具 Eval Board EN5337QI 3A Sync. Buck Convtr RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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