UC3380_15

更新时间:2024-09-18 23:29:17
品牌:UTC
描述:PWM STEP UP DC-DC CONTROLLER

UC3380_15 概述

PWM STEP UP DC-DC CONTROLLER

UC3380_15 数据手册

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UNISONIC TECHNOLOGIES CO., LTD  
UC3380  
CMOS IC  
PWM STEP UP DC-DC  
CONTROLLER  
„
DESCRIPTION  
The UC3380 is PWM step up DC-DC switching controller that  
operates from 0.9V. The low start up input voltage makes UC3380  
specially designed for powering portable equipment from one or two  
cells battery packs. This device consist of a soft start circuit, a reference  
voltage source, an error amplifier, an oscillator, a phase compensation,  
a PWM controller and an output drive circuit for driving external power  
transistor.  
Additionally, a chip enable feature is provided to power down the  
converter for extended battery life. The device features a voltage mode  
PWM control loop, providing stable and high efficiency operation over a  
broad load current range.  
„
FEATURES  
* 0.9V Low Start-Up Input Voltage at 1mA Load  
* Low Operation Current  
* 0.5uA Low Shutdown Current  
* Fix Frequency PWM at 100KHZ  
* Built in PWM Switching Control Circuit ,Duty Ratio is 0~83%  
* Output Voltage:0.1V Step Setting is Available Between 2.0V and 6.5V  
* Soft Start Time: 6ms  
* Shutdown Function  
„
APPLICATIONS  
*Portable Devices  
*Electronic Games  
*Portable Audio (MP3)  
*Personal Digital Assistant (PDA)  
*Digital still Cameras(DSC)  
*Camcorders  
*White LED Driver  
*Single and Dual-Cell Battery Operated Products  
„
ORDERING INFORMATION  
Ordering Number  
Package  
SOT-25  
Packing  
Lead Free  
Halogen Free  
UC3380G-xx-AF5-R  
UC3380L-xx-AF5-R  
Tape Reel  
www.unisonic.com.tw  
1 of 9  
Copyright © 2010 Unisonic Technologies Co., Ltd  
QW-R502-099.C  
UC3380  
CMOS IC  
„
MARKING INFORMATION  
PACKAGE  
VOLTAGE CODE  
MARKING  
18:1.8V  
21:2.1V  
25:2.5V  
27:2.7V  
30:3.0V  
33:3.3V  
40:4.0V  
50:5.0V  
SOT-25  
„
PIN DESCRIPTION  
PIN NO  
NAME  
DESCRIPTION  
Shutdown control input, “H” : normal operation  
“L” : stop step up( whole circuit stop).  
Power supply and voltage output.  
1
SHUTDOWN  
2
3
4
5
VOUT  
NC  
No connection.  
VSS  
Ground.  
EXT  
Switching the circuit by connecting to a transistor.  
UNISONIC TECHNOLOGIES CO., LTD  
2 of 9  
QW-R502-099.C  
www.unisonic.com.tw  
UC3380  
CMOS IC  
„
BLOCK DIAGRAM  
UNISONIC TECHNOLOGIES CO., LTD  
3 of 9  
QW-R502-099.C  
www.unisonic.com.tw  
UC3380  
CMOS IC  
„
ABSOLUTE MAXIMUM RATINGS  
PARAMETER  
SYMBOL  
VOUT  
RATINGS  
12  
UNIT  
V
VOUT Pin Voltage  
SHUTDOWN Pin Voltage  
EXT Pin Voltage  
VSHUTDOWN  
VEXT  
VSS-0.3~12  
-0.3~ VOUT+0.3  
±80  
V
V
EXT Pin Current  
IEXT  
mA  
mW  
°C  
°C  
Power Dissipation  
PD  
250  
Operating Ambient Temperature  
Storage Temperature  
TOPR  
-40~+85  
-40~ +125  
TSTG  
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.  
Absolute maximum ratings are stress ratings only and functional device operation is not implied.  
„ ELECTRICAL CHARACTERISTICS  
Refer to the test circuit, TOPR=25ºC, VIN=VOUT (S)*0.6, IOUT=VOUT (S)/50Ω, unless otherwise specified.  
TEST  
CIRCUIT  
PARAMETER  
TOTAL DEVICE  
SYMBOL  
TEST CONDITION  
MIN  
TYP  
MAX UNIT  
VOUT  
VOUT  
Output Voltage  
VOUT  
2
V
VOUT (S)  
(S)*0.976  
(S)*1.024  
Supply Current 1  
Supply Current 2  
Input Voltage  
IS1  
IS2  
1
1
2
VOUT=VOUT (S)*0.95  
39.8  
6.3  
66.4  
12.5  
10  
uA  
uA  
V
VOUT=VIN (S)+0.5V  
VIN  
Measured by decreasing VIN  
voltage gradually, when  
Operation Holding Voltage VHOLD  
2
0.7  
V
I
OUT=1mA.  
Operation Start Voltage  
Oscillation Start Voltage  
VST1  
VST2  
2
1
IOUT=1mA  
0.9  
0.8  
V
V
Increase the VIN until EXT pin  
output the oscillating signal  
VOUT=VOUT (S)*0.95  
Oscillation Frequency  
Duty Ratio  
fOSC  
1
1
2
2
85  
75  
100  
83  
115  
90  
KHZ  
%
Duty  
LNR  
LDR  
VOUT=VOUT (S)*0.95  
Line Regulation  
Load Regulation  
VIN=VOUT (S)*0.4 to *0.6  
IOUT=10uA to VOUT (S)/50*1.25  
VOUT/(TOPR*VOUT  
30  
60  
mV  
mV  
ppm/  
°C  
30  
60  
)
Temperature Coefficient  
ET  
2
±50  
TOPR=-40°C to +85°C  
Efficiency  
EF  
Ts  
2
2
86  
%
Soft Start time  
SHUTDOWN  
3.0  
6.0  
12.0  
ms  
Shutdown Supply Current  
Shutdown Pin Input  
Current  
ISS  
ISH  
ISL  
1
1
VSHUTDOWN=0  
0.5  
0.1  
uA  
uA  
uA  
VSHUTDOWN=VOUT (S)*0.95  
VSHUTDOWN=0  
-0.1  
Shutdown pin “L” to “H” until  
EXT output oscillating signal  
Shutdown pin  
VIH  
0.75  
V
Shutdown Pin Input  
Voltage Threshold  
1
V
OUT1.5V  
VIL1  
0.3  
0.2  
V
V
“H” to “L” until  
EXT output  
VOUT<1.5V  
V IL2  
oscillating signal  
EXT  
IEXTH  
IEXTL  
1
1
VEXT=VOUT (S) -0.4V  
VEXT= 0.4V  
-16.1  
27.4  
-32.3  
54.8  
mA  
mA  
EXT Pin Current  
Note: VOUT (S) is the value of the set output voltage.  
UNISONIC TECHNOLOGIES CO., LTD  
4 of 9  
QW-R502-099.C  
www.unisonic.com.tw  
UC3380  
CMOS IC  
„
APPLICATION CIRCUIT  
„
TEST CIRCUIT  
1.  
2.  
UNISONIC TECHNOLOGIES CO., LTD  
5 of 9  
QW-R502-099.C  
www.unisonic.com.tw  
UC3380  
CMOS IC  
„
APPLICATION CIRCUIT INFORMATION  
The following equations show the relation of the basic design parameters.  
1. Refer to the application circuit, the increasing inductor current when the switch is turn on is given by the following  
equation  
1
1
d
f
+
ΔiL = ULTON  
=
(UIN US )  
(UIN :input voltage ; US :transistor saturation voltage)  
L
L
The decreasing inductor current when the switch is turn off can derive by the equation below  
1
1
1d  
ΔiL = ULTOFF = − (UO +UD UIN )  
UD diode forward voltage)  
L
L
f
+
according to ΔiL + ΔiL = 0 ,the duty ratio is given by  
UO +UD UIN  
UO +UD US  
d =  
IO  
2. The average current flowing through the inductor is IL =  
1d  
3. We note that IO = (1 d)IL  
IL  
then we can write: IO = (1 d)  
ΔiL  
ΔiL  
1
substituting ΔiL = ULTOFF ΔiL for equation above, output current is given by  
L
1
1
ΔiL  
IL  
IO = (1 d) •  
IO = (1 d) •  
ULTOFF ( ICR =  
ICR L  
)
1
1
1d  
f
(Uo +UD UIN )  
ICR L  
derive that  
4. The peak current of the inductor is given by  
1
IPK = IL + ΔiL  
2
1 ΔiL  
2 IL  
IPK = IL +  
IL  
ΔiL  
according to ICR =  
derive that  
IL  
1
IPK = IL + ICR IL  
2
Then derive the following equation for peak current of inductor  
1
IPK = IL (1 + ICR)  
2
UNISONIC TECHNOLOGIES CO., LTD  
6 of 9  
QW-R502-099.C  
www.unisonic.com.tw  
UC3380  
CMOS IC  
„
APPLICATION CIRCUIT INFORMATION (Cont.)  
5. Charge stores in C3 during charging up is given by ΔQ = IC TOFF  
1d  
we can write ΔQ = (IL IO )•  
f
6. Output ripple voltage is given by  
VPP = ΔUC + ESR (IL IO ) (ESR: equivalent series resistance of the output capacitor)  
ΔQ  
C
VPP =  
+ ESR (IL IO )  
Then we give the following example about choosing external components by considering the design parameters.  
Design parameters: UIN =1.5V Uo=2.1V IO =200mA VPP =100mV f=300KHZ ICR=0.2  
Assume UD and US are both 0.3V, the duty ratio is  
UO +UD UIN 2.1+ 0.31.5  
UO +UD US 2.1+ 0.30.3  
d =  
=
= 0.429  
In order to generate the desired output current and ICR, the value of inductor should meets the following formula  
(1– d)2(UO+UD-UIN) (1– 0.429)2(2.1V+0.3V-1.5V)  
24.5uH  
=
L  
=
ICR IO f  
0.2×0.2A×300000HZ  
Calculate the average current and the peak current of inductor  
IO  
0.2A  
IL =  
=
= 0.35A  
1d 10.429  
1
1
IPK = IL (1+ ICR) = 0.35A×(1+ ×0.2) = 0.385A  
2
2
So, we make a trial of choosing a 22uH inductor that allowable maximum current is lager than 0.385A.  
Determine the delta charge stores in C3 during charging up  
1d  
10.429  
300000HZ  
ΔQ = (IL IO )•  
= (0.35A0.2A)×  
= 0.286uC  
f
Assume the ESR of C3 is 0.15, determine the value of C3  
ΔQ  
VPP ESR (IL IO ) 0.10.15Ω×(0.35A0.2A)  
0.286×106 C  
C ≥  
=
= 3.69uF  
Therefore, a Tantalum capacitor with value of 10uF and ESR of 0.15can be used as output capacitor. However,  
the optimized value should be obtained by experiment.  
UNISONIC TECHNOLOGIES CO., LTD  
7 of 9  
QW-R502-099.C  
www.unisonic.com.tw  
UC3380  
CMOS IC  
„
EXTERNAL COMPONENTS  
1. Diode (D1)  
The diode is the largest source of loss in DC-DC converters. The most important parameters which affect the  
efficiency are the forward voltage drop UD and the reverse recovery time. The forward voltage drop creates a loss  
just by having a voltage across the device while a current flowing through it. The reverse recovery time generates a  
loss when the diode is reverse biased, and the current appears to actually flow backwards through the diode due to  
the minority carriers being swept from the P-N junction. A Schottky diode with the following characteristics is  
recommended:  
*Low forward voltage: UD < 0.3V  
*Fast reverse recovery time/switching speed: 50nS  
*Rated current: > IPK  
*Reverse voltage: UO +UD  
2. Inductor (L1)  
Low inductance values supply higher output current, but also increase the ripple and reduce efficiency. Choose a low  
DC-resistance inductor to minimize loss. It is necessary to choose an inductor with saturation current greater than  
the peak current that the inductor will encounter in the application. Saturation occurs when the inductor’s magnetic  
flux density reaches the maximum level the core can support and inductance falls.  
3. Capacitor (C1, C3)  
The input capacitor C1 improves the efficiency by reducing the power impedance and stabilizing the input current.  
Select a C1 value according to the impedance of the power supply used. Small Equivalent Series Resistance (ESR)  
Tantalum or ceramic capacitor with an appropriate value should be suitable  
The output capacitor is used for smoothing the output voltage and sustaining the output voltage when the switch is  
on. Select an appropriate capacitor depending on the ripple voltage that increases in case of a higher output voltage  
or a higher load current. The capacitor value should be 10uF minimum. Small ESR should be used to reduce output  
ripple voltage. However, the best ESR may depend on L, capacitance, wiring and applications (output load).  
Therefore, fully evaluate ESR under an actual condition to determine the best value.  
4. External transistor (Q1 R1 C2)  
An enhancement N-channel MOSFET or a bipolar NPN transistor can be used as the external switch transistor.  
*Bipolar NPN transistor  
The hFE value of NPN transistor and the R1 value determine the driving capacity to increase the output  
current using a bipolar transistor. 1Kis recommended for R1. R1 is selected from the following calculation.  
IPK  
Calculate the necessary base current(Ib) from the bipolar transistor hFE using Ib =  
hFE  
Vout 0.7  
0.4  
R1=  
Ib  
| IEXTH |  
UNISONIC TECHNOLOGIES CO., LTD  
8 of 9  
QW-R502-099.C  
www.unisonic.com.tw  
UC3380  
CMOS IC  
„
EXTERNAL COMPONENTS(Cont.)  
Since the pulse current flows through the transistor, the exact Rb value should be finely tuned by the  
experiment. Generally, a small Rb value can increase the output current capability, but the efficiency will  
decrease due to more energy is used to drive the transistor.  
Moreover, a speed up capacitor, C2, should be connected in parallel with R1 to reduce switching loss and  
improve efficiency. C2 can be calculated by the equation below:  
1
C2 ≤  
2π × R1× fOSC ×0.7  
It is due to the variation in the characteristics of the transistor used. The calculated value should be used as  
the initial test value and the optimized value should be obtained by the experiment.  
*Enhancement MOS FET  
For enhancement N-channel MOSFET, since enhancement MOSFET is a voltage driven, it is a more efficient  
switch than a BJT transistor. However, the MOSFET requires a higher voltage to turn on as compared with BJT  
transistors. An enhancement N-channel MOSFET can be selected by the following guidelines:  
-Input capacitance less than 700pF.  
-Low gate threshold voltage.  
-Low on-resistance.  
-The allowable maximum current of drain should be larger than peak current of inductor.  
UTC assumes no responsibility for equipment failures that result from using products at values that  
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or  
other parameters) listed in products specifications of any and all UTC products described or contained  
herein. UTC products are not designed for use in life support appliances, devices or systems where  
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in  
whole or in part is prohibited without the prior written consent of the copyright owner. The information  
presented in this document does not form part of any quotation or contract, is believed to be accurate  
and reliable and may be changed without notice.  
UNISONIC TECHNOLOGIES CO., LTD  
9 of 9  
QW-R502-099.C  
www.unisonic.com.tw  

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