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D8213 の電気的特性と機能

D8213のメーカーはiDESYNです、この部品の機能は「Dual High-Efficiency PWM Step-Down DC-DC Converter」です。


製品の詳細 ( Datasheet PDF )

部品番号 D8213
部品説明 Dual High-Efficiency PWM Step-Down DC-DC Converter
メーカ iDESYN
ロゴ iDESYN ロゴ 




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D8213 Datasheet, D8213 PDF,ピン配置, 機能
iDESYN
D8213
Dual High-Efficiency
PWM Step-Down DC-DC Converter
General Description
The i D8213 is a dual high efficiency Pul se Width
Modulated ( PWM) step-down DC-DC c onverter. I t i s
capable o f delivering 1. 2A output curr ent o ver a w ide
input v oltage range f rom 2.6V t o 5.5V, t he i D8213 is
ideally s uited for port able electronic de vices that are
powered f rom 1-cell Li-ion battery or from ot her power
sources w ithin the range such as cel lular phones ,
PDAs and other handheld devices.
Two operat ional m odes are a vailable: PWM/Low-
Dropout auto-switch and shutdown m odes. Internal
synchronous rect ifier wi th low RDS(ON) dramatically
reduces conduct ion loss at P WM mode. No external
Schottky diode is required in practical application.
The i D8213 ent ers Low -Dropout mode w hen norm al
PWM cannot pro vide regulated out put voltage by
continuously t urning on t he upper PMOS. The iD8213
enter shutdo wn m ode and consum es less than 0. 1 A
when EN pin is pulled low.
The s witching ripple is easily smoothed-out by s mall
package fi ltering e lements due to a fixed operation
frequency of 1.5MHz. This along with small TDFN-12L
and T DFN-10 pac kage pr ovides small PCB ar ea
application. O ther f eatures i nclude soft start, l ower
internal r eference voltage w ith 3% accurac y, over
temperature protection, and over current protection.
Ordering Information
iD8213 -
Taping
Package R: Tape and Reel
FEC:TDFN-12L (3x3)
FEA:TDFN-10 (3x3)
Output Voltage Voltage Code
Adjustable
AD
Applications
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Features
2.6V to 5.5V Input Range
Adjustable Output Voltage
1.2A Output Current per Channel
95% Efficiency
No Schottky Diode Required
40 A Quiescent Current per Channel
1.5MHz Fixed-Frequency PWM Operation
Small TDFN-12 and TDFN-10 Package
RoHS Compliant and Green
Marking Information
For marking information, please contact our sales
representative directly or through distributor around
your location.
Jan. 2014
1
V0.2
http://www.Datasheet4U.com

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D8213 pdf, ピン配列
iDESYN
Pin Configurations (Top View)
VIN2
SW2
GND
FB1
NC1
EN1
1
2
3
4
5
6
GND
13
12 EN2
11 NC2
10 FB2
9 GND
8 SW1
7 VIN1
TDFN-12L Package
iD8213
(Top View)
TDFN-10 (3mm x 3mm)
EN1 1
FB1 2
IN2 3
GND2 4
SW2 5
10 SW1
9 GND1
8 IN1
7 FB2
6 EN2
Exposed pad
on backside
TDFN-10 Package
Absolute Maximum Ratings (Note 1)
Supply Voltage VIN
6V
Power Dissipation, PD @ TA=25°C
TDFN-12L / TDFN-10
2.083W
Thermal Resistance, ja
TDFN-12L / TDFN-10
48°C/W
Lead Temperature
260°C
Storage Temperature
ESD Susceptibility
HBM (Human Body Mode)
MM (Machine Mode)
-65°C to 150°C
2 kV
2 00V
Recommended Operating Conditions
In put Voltage VIN
2.6 V to 5.5V
EN Input Voltage
0V to VIN
Junction Temperature
-4 0°C to 125°C
Ambient Operating Temperature
-40°C to 85°C
Jan. 2014
3
V0.2


3Pages


D8213 電子部品, 半導体
iDESYN
iD8213
Functional Description
The basic iD8213 application circuit is shown in Typical
Application C ircuit. E xternal c omponent selection is
determined by the m aximum l oad current and begins
with t he select ion of the inductor value and oper ating
frequency followed by CIN and COUT.
Inductor Selection
For a given input and output voltage, the inductor value
and operat ing frequency det ermine t he ripple current.
The ripple current IL increases with higher VIN and
decreases with higher inductance.
IL VOUT
1 VOUT
fL
VIN
Having a l ower ripple current reduces the ESR losses
in the out put capacitors and t he out put voltage ripple.
Highest efficiency operation is ach ieved at low
frequency wit h s mall ripple cur rent. This, however,
requires a large inductor.
A r easonable start ing po int for selecting the ripple
current is IL = 0.4(I MAX). The largest ri pple cur rent
occurs at t he highest VIN. To guarantee that the ripple
current stays below a specified maximum, the i nductor
value should be chosen acc ording t o t he following
equation:
L VOUT
1 VOUT
f IL(MAX )
VIN ( MAX )
Inductor Core Selection
Once the value for L is know n, the t ype of inductor
must be selected. High efficiency c onverters generally
cannot afford the core loss found in low cost powdered
iron cores, forcing the use of more expensive ferrite or
permalloy cores. A ctual core loss is i ndependent of
core si ze f or a fix ed induc tor v alue but it i s very
dependent on t he i nductance s elected. As the
inductance increases, core losses decrease. However,
increased i nductance r equires m ore turns of wire and
therefore copper losses will increase.
Ferrite desi gns ha ve very low core loss es and are
preferred a t high sw itching frequencies, so design
goals can conc entrate on copper l oss and pre venting
saturation. Ferrite cor e material saturates hard,
which m eans that inductance collapses abruptly when
the peak design current is exceeded.
This res ults in an abrupt i ncrease i n inductor ri pple
current and consequent output voltage ripple.
Do not allow the core to saturate!
Different cor e m aterials and shapes w ill c hange the
size/current and pr ice/current rel ationship of an
inductor. T oroid or shi elded pot cores in ferrite or
permalloy materials are small and don't radiate energy
but generally cost more than powdered i ron core
inductors w ith similar characteristics. The choi ce o f
which style inductor to use mainly depend on the pr ice
vs. s ize r equirements and any radiated field/EMI
requirements.
CIN and COUT Selection
The input capacitance, CIN, is needed to filter the
trapezoidal current at t he source of t he t op MOSFET.
To pr event l arge ripple voltage, a low ES R i nput
capacitor sized for the ma ximum RMS cur rent should
be used. RMS current is given by :
IRMS
VOUT
IOUT ( MAX )
VIN
VIN
VOUT
1
This formula has a maximum at VIN = 2VOUT, where
IRMS = IOUT/2. This sim ple worst-case condi tion is
commonly us ed for desi gn because e ven significant
deviations do not offer much r elief. Note that ripple
current ratings from capacitor manufacturers are oft en
based on onl y 2000 hours of life w hich makes i t
advisable t o further de-rate the capacitor, or c hoose a
capacitor rated at a hi gher temperature than required.
Several capacitors may also be paralleled to meet size
or height requirements in the design.
The s election o f COUT is deter mined by the effective
Jan. 2014
6
V0.2

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Dual High-Efficiency PWM Step-Down DC-DC Converter

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