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부품번호 | EML3171 기능 |
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기능 | Synchronous Step-Down DC-DC Converter | ||
제조업체 | Elite Semiconductor | ||
로고 | |||
ESMT
EML3171
2.0A, Synchronous Step-Down DC-DC Converter
General Description
EML3171 is a high efficiency, DC-DC synchronous
buck converter which provides 2.0A output loading
after output voltage reach preset voltage. EML3171
uses different modulation algorithms for various
loading conditions. Under heavy load, EML3171
regulates the output voltage using Pulse Width
Modulation (PWM). The PWM mode provides low
output voltage ripple and fixed frequency noise.
While in light load, it enters Power Skip Modulation
(PSM) automatically to ensure a highly efficient
operation at light load condition. Under very heavy
load condition or when the input voltage
approaches the output voltage, EML3171 enters low
dropout voltage operation under 100% duty cycle.
The internal generated 0.8V precision feedback
reference voltage is designed for low output voltage
request. Low Power-FET Ron synchronous switch
dramatically reduces conduction loss.
The EML3171 is available in an 8-pin, space-saving
TDFN-3x3 package.
Typical Application
Features
Wide Operating Voltage Ranges : 2.6V to 5.5V
2.0A Output Current
High efficiency Buck Power Converter
Auto-select PSM/PWM
LDO mode: duty cycle: 100%
Synchronous Power Switches Rectification, no
Schottky Diode Required
1.4MHz Switching Frequency
Internal Soft-Start
Current Limit Protection
Over Temperature Protection
Output Shorting Protect
Output Over Voltage Protection
Applications
Cellular telephone
Wireless and DSL Modems
Digital Still Cameras
Portable Products
MP3 Players
R
V = V × (1 + 1 )
OUT
FB
R
2
Fig. 1 EML3171 application circuit
Elite Semiconductor Memory Technology Inc.
Publication Date: Dec. 2013
Revision: 0.1
1/16
ESMT
EML3171
Absolute Maximum Ratings
Devices are subjected to fail if they stay above absolute maximum ratings.
Input Voltage (VIN, VCC) ---------------- – 0.3V to 6.0V
EN, FB Voltages -------------------------------- – 0.3V to VIN
SW Voltage -------------------------- – 0.3V to (VIN + 0.3V)
Lead Temperature (Soldering, 10 sec)----------- 260°C
Operating Temperature Range ----- –40°C to 85°C
Junction Temperature (Note 1) ------------------- 150°C
Storage Temperature Range -------- – 65°C to 150°C
Thermal data
Package
TDFN-8
(3x3mm)
Thermal resistance
θJA (Note 2)
θJT (Note 3)
Parameter
Junction-ambient
Junction-top of package
Value
110oC/W
8.5oC/W
Electrical Characteristics
VIN=VVCC=VEN=3.6V, VOUT=1.2V, VFB=0.8V, L=2.2uH, CIN=22uF, COUT=22uF, TA = 25°C unless otherwise specified.
Symbol
Parameter
VIN Input Voltage Range
IQ Supply Current VIN=3.6V
UVLO
Vref
VEN
Under Voltage Lockout
Reference Voltage
Enable Threshold
Conditions
Switching (EN=VCC)
Shutdown (EN=0)
When SW starts/stops switching
VIN = 2.6V to 5.0V
-40℃ ~ +85℃
Min Typ Max Units
2.6 5.5 V
170 μA
1 μA
1.8 2.1 V
0.784 0.8 0.816 V
0.4 1.5 V
When using external feedback
VO Output Voltage Range
resistors to drive FB
0.8
VIN V
Vout Output Voltage Accuracy 2.6V≦VI≦5.5V, 0mA≦IO≦3A
0.97xVNOM VNOM 1.03xVNOM V
ΔVOUT/ΔVOU Line Regulation
VIN = 2.6V to 5.0V, IOUT=10mA
VIN = 2.6V to 5.0V, IOUT=2.0A
0.04 %/V
0.08 %/V
ΔVOUT/ΔIOUT Load Regulation
Iout = 1mA to 2.0A
0.01 %/A
RON(P) R DS(ON) of PMOS
IOUT=100mA
100 mΩ
RON(N) R DS(ON) of NMOS
IOUT=100mA
100 mΩ
IOCH High Side Current Limt
Duty Cycle = 100%, VIN = 2.6V to 3.75
4.5
6
A
IOCL Low Side Current Limt
5.0V
-0.6 A
FOSC Oscillator Frequency
VFB=0.8V, -40℃~+85℃
1.12 1.4 1.68 MHz
Max. Duty Maximum Duty
Min. Duty Minimum Duty.
VIN = 2.6V to 5.0V
100
15
%
%
OTP Thermal Shutdown
Hysteresis=35℃
165 ℃
Note 1: TJ is a function of the ambient temperature TA and power dissipation PD (TJ = TA + (PD) *θJA )).
Note 2: θJA is measured in the natural convection at TA=25℃ on a highly effective thermal conductivity test
board(2 layers , 2S0P ) according to the JEDEC 51-7 thermal measurement standard.
Note 3: θJT represents the heat resistance between the chip and the center of package top.
Elite Semiconductor Memory Technology Inc.
Publication Date: Dec. 2013
Revision: 0.1
4/16
4페이지 ESMT
EML3171
Typical Performance Characteristics (cont.)
VIN=5.0V, TA=25℃, L=2.2uH, CIN=22uF, COUT=22uF, unless otherwise specified
Output Voltage vs. Temperature (Fig. 15) Oscillator Frequency vs. Temperature (Fig.16)
3.36
VI=5.0V
3.34 VO=3.3V
IO=500mA
3.32
3.30
3.28
3.26
3.24
-40
-15
Output Voltage
10 35
Temperature (℃)
60
85
PSM/PWM Boundaries (Fig.17)
1.8
1.7 VI=5.0V
VO=3.3V
1.6 IO=500mA
1.5
1.4
1.3
1.2
1.1
1.0
-40
-15
Oscillator Frequency
10 35
Temperature (℃)
60
85
PSM/PWM Boundaries (Fig.18)
50
VO=3.3V
CO=22uF
40 L=2.2uH
The switching mode changes
30 at these boundaries.
20
Always PWM
10 Always PSM
0
4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5
Input Voltage (V)
120
VO=1.2V
100 CO=22uF
L=2.2uH
Always PWM
80
60
40 Always PSM
20
The switching mode changes
at these boundaries.
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Output Voltage Ripple (Fig.19)
Output Voltage Ripple (Fig.20)
100
90 VI=5.0V
80
70
60
50
40 VI=3.6V VI=4.2V
30
20 VO=1.2V
CO=22uF
10 L=2.2uH
0
0 10 20 30 40 50 60 70 80 90 100
Output Current (mA)
120
110
100
90
80
70
60
50
40
30
20
10
0
0
VI=5.5V
VI=4.2V
VI=5.0V
5 10 15 20
Output Current (mA)
VO=3.3V
CO=22uF
L=2.2uH
25 30
Elite Semiconductor Memory Technology Inc.
Publication Date: Dec. 2013
Revision: 0.1
7/16
7페이지 | |||
구 성 | 총 16 페이지수 | ||
다운로드 | [ EML3171.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
EML3170 | Synchronous Step-Down Regulator | Elite Semiconductor |
EML3171 | Synchronous Step-Down DC-DC Converter | EML3171-EliteSemiconductor.pdf |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |