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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)： | 12/13頁 |
| 文件大小： | 266K |
| 代理商： | EN5335QI |
00846
06/01/2010
Rev: F
EN5335QI
Enpirion 2010 all rights reserved, E&OE
www.enpirion.com
8
Theory of Operation
Synchronous Buck Converter
The
EN5335QI
is
a
synchronous,
pin
programmable power supply with integrated
power
MOSFET
switches
and
integrated
inductor. The nominal input voltage range is 2.4-
5.0V. The output can be set to common pre-set
voltages by connecting appropriate combinations
of 3 voltage selection pins to ground. The
feedback control loop is a type III voltage-mode
and the part uses a low-noise PWM topology. Up
to 3A of output current can be drawn from this
converter.
The
5MHz
operating
frequency
enables the use of small-size output capacitors.
The power supply has the following protection
features:
Over-current protection (to protect the IC
from excessive load current)
Thermal shutdown with hysteresis
Over-voltage protection
Under-voltage lockout circuit to disable the
converter output when the input voltage is
less than approximately 2.2V
Additional features include:
Soft-start circuit, limiting the in-rush
current when the converter is powered up
Power good circuit indicating whether the
output voltage is within 90% - 120% of the
programmed voltage
Output Voltage Programming
The EN5335QI output voltage is programmed
using a 3-pin voltage-ID or VID selector.
Three
binary VID pins allow the user to choose one of
seven pre-set voltages. Refer to Table 1 for the
proper VID pin settings to choose VOUT.
The voltage select pins, VS0, VS1, and VS2, are
pulled-up internally and so will default to a logic
high, or “1”, if left “open”. Connecting the voltage
select pin to ground will result in a logic “0”.
Table 1: Output Voltage Select Table:
VS2*
VS1*
VS0*
Output Voltage
0
3.3V
0
1
2.5V
0
1
0
1.8V
0
1
1.5V
1
0
1.25V
1
0
1
1.2V
1
0
0.8V
1
Reserved
Input Capacitor Selection
The EN5335QI requires about 20uF of input
capacitance.
Low-cost,
low-ESR
ceramic
capacitors should be used as input capacitors for
this converter. The dielectric must be X5R or
X7R rated. In some applications, lower value
capacitors are needed in parallel with the larger,
capacitors in order to provide high frequency
decoupling. It is recommended to use 10V rated
MLCC capacitors.
Table 2. Recommended input capacitors.
Description
MFG
P/N
10uF, 10V, 10%
X7R, 1206
(2 capacitors needed)
Murata
Taiyo Yuden
GRM31CR71A106KA01L
LMK316B7106KL-T
22uF, 10V, 10%
X7R, 1210
(1 capacitor needed)
Murata
Taiyo Yuden
GRM32ER71A226KE20L
LMK325B7226KM-T
Output Capacitor Selection
The EN5335QI has been optimized for use with
approximately 50F of output capacitance. Low
ESR ceramic capacitors are required with X5R or
X7R rated dielectric formulation.
Y5V or
equivalent dielectric formulations must not be
used as these lose capacitance with frequency,
temperature and bias voltage.
Output ripple voltage is determined by the
aggregate output capacitor impedance. Output
impedance, denoted as Z, is comprised of
effective series resistance, ESR, and effective
series inductance, ESL:
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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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