UC3550G-XX-AF5-R [UTC]

PWM CONTROLLED,PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER; PWM控制, PWM / PFM可转换升压型DC-DC控制器
UC3550G-XX-AF5-R
型号: UC3550G-XX-AF5-R
厂家: Unisonic Technologies    Unisonic Technologies
描述:

PWM CONTROLLED,PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER
PWM控制, PWM / PFM可转换升压型DC-DC控制器

控制器
文件: 总10页 (文件大小:363K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
UNISONIC TECHNOLOGIES CO., LTD  
UC3550  
CMOS IC  
PWM CONTROLLEDPWM/PFM  
SWITCHABLE STEP-UP DC-DC  
CONTROLLER  
1
2
3
„
DESCRIPTION  
5
The UTC UC3550 series is a compact, high efficiency, step-up  
4
DC/DC controllers includes an error amplifier, oscillator, PWM  
comparator, skip cycle comparator, voltage reference, soft-start, and  
high speed lower ON-resistance driver for driving external power  
devices (NMOS or NPN) ,Additionally, a CE (chip enable) function that  
reduces power consumption during shut-down mode.  
SOT-25  
That typically operated from a single-or dual-cell battery packs. It  
have a driver pin ,ext pin, for connecting to an external transistor(NMOS  
or NPN). a lower ON-resistance external transistor can obtain larger  
output current. With only external components, this series allow a  
simple means to accommodate high output current applications.  
The UTC UC3550 series goes automatically into skip switching  
cycles under light load condition to maintain high efficiency.  
„
FEATURES  
* Input Voltage Range0.9~8V  
* Output Voltage Range1.8~6V Programmable in 0.1V with High  
Accuracy ± 2.5%  
* High Efficiency 88% (Typ.)  
* Low Start-up Voltage of 0.9V Typical at IOUT = 1.0mA  
* Oscillator Frequency: 300kHz.(±20%)  
* Chip Enable Pin with Pull-up Current Source  
* High Output Current up to 1000mA (VIN = 2.0V, VOUT =3.3V)  
„ ORDERING INFORMATION  
Order Number  
Package  
SOT-25  
Packing  
UC3550G-xx-AF5-R  
Tape Reel  
www.unisonic.com.tw  
Copyright © 2010 Unisonic Technologies Co., Ltd  
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UC3550  
CMOS IC  
„
MARKING INFORMATION  
PACKAGE VOLTAGE CODE  
MARKING  
33:3.3V  
SOT-25  
50:5.0V  
„
PIN CONFIGURATION  
„
PIN DESCRIPTION  
PIN NO  
PIN NAME  
DESCRIPTION  
Chip Enable:  
1
CE  
The chip is enabled if a voltage equal to or greater than 1.0V or left floating is applied.  
The chip is disabled if a voltage less than 0.3V is applied.  
Output voltage monitor, IC internal power supply  
No connection  
2
3
4
5
OUT  
NC  
GND  
EXT  
Ground  
External transistor drive  
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UC3550  
CMOS IC  
„
BLOCK DIAGRAM  
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CMOS IC  
„
ABSOLUTE MAXIMUM RATING  
PARAMETER  
SYMBOL  
VOUT  
VEXT  
IEXT  
RATINGS  
-0.3~8  
UNIT  
V
Supply Voltage  
EXT Voltage  
-0.3 ~ 8  
V
EXT Sink/Source Current  
CE Input Voltage Range  
CE Input Current Range  
Power Dissipation (Ta=25°C)  
Junction Temperature  
-150 ~ +150  
-0.3 ~ 12.0  
-155 ~ 155  
500  
mA  
V
VCE  
ICE  
mA  
mW  
°C  
PD  
TJ  
+150  
Operating Temperature  
Storage Temperature  
TOPR  
TSTG  
-40 ~ +85  
-55 ~ +150  
°C  
°C  
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.  
„
THERMAL DATA  
PARAMETER  
SYMBOL  
RATINGS  
250  
UNIT  
°C/W  
Junction to Ambient  
θJA  
„
ELECTRICAL CHARACTERISTICS (Ta=25°C, fOSC300kHz, unless otherwise specified)  
UC3550-3.3V  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
MIN  
240  
70  
TYP  
MAX  
360  
UNIT  
OSCILLATOR  
Frequency  
fOSC  
f  
VOUT=VSET×0.96  
300  
0.10  
80  
kHz  
%/°C  
%
Frequency Temperature Coefficient  
Maximum PWM Duty Cycle  
Minimum Start-up Voltage  
Minimum Start-up Voltage  
Minimum Start-up Voltage  
Temperature Coefficient  
Minimum Operation Hold Voltage  
Soft-Start Time  
Ta=-40°C ~ 85°C  
VOUT=VSET×0.96  
DMAX  
90  
VSTART1 IOUT=0mA  
VSTART2 IOUT=1mA  
800  
900  
900  
mV  
mV  
1000  
VSTART Ta=-40°C ~ 85°C  
-1.6  
mV/°C  
VOPR  
tSS  
IOUT=0mA  
VOUT=VSET  
600  
60  
700  
250  
mV  
ms  
CE (PIN 1)  
CE Input Voltage :  
900  
High State, Device Enabled  
Low State, Device Disabled  
CE Input Current :  
mV  
mV  
VCEH  
VCEL  
VOUT=VSET×0.96  
680  
High State, Device Enabled  
Low State, Device Disabled  
EXT (PIN 5)  
ICEH  
ICEL  
VOUT=VCE=5.0V  
-0.5  
0
0
0.5  
0.5  
μA  
μA  
VOUT=5.0V, VCE=0V  
0.15  
EXT “H”  
ON Resistance  
REXTH  
REXTL  
VEXT=VOUT-0.4V  
VEXT=0.4V  
11  
8
15  
12  
EXT “L”  
TOTAL DEVICE  
Output Voltage  
VOUT  
3.218  
3.3  
3.383  
V
Output Voltage  
VOUT Ta=-40 ~ 85°C  
150  
ppm/°C  
temperature coefficient  
Operating Current  
Stand-by Current  
IDD  
VOUT=VCE=VSET×0.96  
103  
15  
160  
38  
μA  
μA  
ISTN-BY VOUT=VCE=VSET+0.5V  
V
OUT=5.0V, VCE=0V,  
Off-State Current  
Efficiency  
IOFF  
0.6  
88  
1.5  
μA  
Ta=-40 ~ +85°C  
η
IOUT = 200mA, VIN = 2.0V  
80  
%
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„
ELECTRICAL CHARACTERISTICS (Cont.)  
UC3550-5.0V  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
MIN  
240  
70  
TYP  
MAX  
UNIT  
OSCILLATOR  
Frequency  
fOSC  
f  
VOUT=VSET×0.96  
300  
0.1  
80  
360  
kHz  
%/°C  
%
Frequency Temperature Coefficient  
Maximum PWM Duty Cycle  
Minimum Start-up Voltage  
Minimum Start-up Voltage  
Minimum Start-up Voltage  
Temperature Coefficient  
Minimum Operation Hold Voltage  
Soft-Start Time  
Ta=-40°C ~ 85°C  
VOUT=VSET×0.96  
DMAX  
90  
900  
1
VSTART1 IOUT=0mA  
VSTART2 IOUT=1mA  
800  
900  
mV  
V
VSTART Ta=-40°C ~ 85°C  
-1.6  
mV/°C  
VOPR  
tSS  
IOUT=0mA  
VOUT=VSET  
600  
60  
700  
200  
mV  
ms  
CE (PIN 1)  
CE Input Voltage :  
High State, Device Enabled  
Low State, Device Disabled  
CE Input Current :  
VCEH  
VCEL  
900  
mV  
mV  
VOUT=VSET×0.96  
680  
High State, Device Enabled  
Low State, Device Disabled  
EXT (PIN 5)  
ICEH  
ICEL  
VOUT=VCE=5.0V  
-0.5  
0
0
0.5  
0.5  
μA  
μA  
VOUT=5.0V, VCE=0V  
0.15  
EXT “H”  
ON Resistance  
REXTH VEXT=VOUT-0.4V  
REXTL VEXT=0.4V  
6
6
10  
10  
EXT “L”  
TOTAL DEVICE  
Output Voltage  
VOUT  
4.875  
5
5.125  
V
Output Voltage temperature  
coefficient  
VOUT Ta=-40 ~ 85°C  
150  
ppm/°C  
Operating Current  
Stand-by Current  
IDD  
VOUT=VCE=VSET×0.96  
136  
15  
220  
38  
μA  
μA  
ISTN-BY VOUT=VCE=VSET+0.5V  
V
OUT=5.0V, VCE=0V,  
Off-State Current  
Efficiency  
IOFF  
0.6  
88  
1.5  
μA  
Ta=-40 ~ +85°C  
η
IOUT = 200mA, VIN = 3.0V  
80  
%
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„
TYPICAL STEP-UP CONVERTER APPLICATION  
10uH  
VIN  
VOUT  
220uF  
EXT  
CE  
1
OUT  
2
5
UTC  
UC3550  
GND  
NC  
10uF  
3
4
0.1µ  
Step-up Converter using external MOSFET  
10uH  
VIN  
VOUT  
220uF  
Cb 3000P  
EXT  
CE  
1
OUT  
5
Rb 560  
UTC  
UC3550  
2
NC  
GND  
10uF  
0.1µ 3  
4
Step-up Converter using external NPN  
Recommended components  
Nmos tR XP161A0390PR/ (Torex) or NTGS3446T1(ON SEMI)  
L
10Uh(Sunida CD54 fosc300kHz)  
MA737, or MBRM110L  
10V 10uF (tantalum)  
SD  
CIN  
CL  
16V220uF (tantalum)  
NPN tR type  
tR  
2SD1628(Sanyo)MMJT9410  
Rb  
Cb  
5001000(Adjust according to load and Tr. hFE levels)  
3000p(ceramic type)  
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CMOS IC  
„
EXTERNAL COMPONENT SELECTION  
Inductor Selection  
An inductor value of 10uH performs well in most application. The UC3550 series also work with inductors in the  
4.7uH to 12uH range. An inductor with higher peak inductor current tends a higher output voltage ripple(IPEAK x  
output filter capacitor ESR). The inductor’s DC resistance significantly affects efficiency.  
Output Capacitor Selection  
The output ripple voltage(IPEAK x output filter capacitor ESR)is the product of the peak inductor current and the  
output capacitor Equivalent Series Resistance (ESR). Best performances are obtained with good high frequency  
characteristics capacitors and low ESR. The best compromise for the value of the Output Capacitance is 220F  
Tantalum Capacitor. The output capacitor as close as possible to the device pins.  
Input Capacitor Selection  
The Input Capacitor is required to compensate, if present, the series impedance between the Supply Voltage  
Source and the Input Voltage of the Application. A value of 10F is enough to guarantee stability for distances less  
than 2". In any case we suggest to connect both capacitors, The input capacitor as close as possible to the device  
pins.  
Diode Selection  
The Schottky diode with an high switching speed and a very low Forward Voltage (VF) is needed. Higher VF may  
cause lost power as heat in the diode, with a decrease of the Efficiency. Moreover, since the Output Voltage pin is  
also used as the device Supply Voltage, the Start-up Voltage (see related plots) is strictly due to the diode Forward  
Voltage at the rated Forward Current.  
External Component Selection  
An enhancement N-channel MOSFET or a bipolar NPN transistor can be used as the external switch transistor.  
since enhancement N-channel MOSFET is a voltage driven device, it is a more efficient switch than a BJT transistor.  
However, he MOSFET requires a higher voltage to turn on as compared with BJT transistor  
For enhancement N-channel MOSFET ( it is especially importance for R  
GS TH) must be<VOUT, typically<1.5V.  
For bipolar NPN transistor, continuous collector current typically 1A to 4A and VCE(SAT)<0.2V. the driving capability  
DS(ON),typically<0.1, threshold voltage,  
V
(
is determined by the DC current gain, HFE, of the transistor and the base resistor, Rb. Moreover, a speed-up  
capacitor, Cb should be connected in paralled with Rb to reduce switch loss and improve efficiency.  
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UC3550  
CMOS IC  
„
TYPICAL CHARACTERISTICS  
No Load Input  
No Load Input  
Current vs. Input Voltage (Using MOSFET)  
10  
Current vs. Input Voltage (Using BJT)  
100  
10  
1
1
VOUT=5.0V,  
Rb=560Ω  
VOUT=5.0V  
0.1  
0.1  
VOUT=3.0V,  
Rb=560Ω  
VOUT=3.0V  
0.01  
0.01  
1
1
2
5
3
4
2
5
6
3
4
Input Voltage, VIN (V)  
Input Voltage, VIN (V)  
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CMOS IC  
„
TYPICAL CHARACTERISTICS(Cont.)  
Startup/Hold Voltage vs Output Current  
(Using MOSFET) Output Current (3.3V)  
2.0  
Efficiency vs Output Current (5.0V)  
100  
80  
60  
40  
20  
0
VIN=3.0V  
VIN=2.0V  
Vstart  
1.6  
1.2  
0.8  
0.4  
0.0  
VIN=0.9V  
Vnold  
0. 01  
0.1  
1
10  
100  
1000  
0
20  
40  
60  
80 100  
Output Current, IOUT (mA)  
Output Current, IC (mA)  
EXT ON-Resistance vs Temperature  
Ripple Voltage vs Output Current  
VIN=2.0V  
200  
25  
20  
15  
10  
5
180  
160  
140  
120  
100  
VOUT=5.0V×0.96  
EXT=VOUT-0.4V  
Open-Loop Test  
VIN=3.0V  
VIN=1.5V  
V
80  
60  
40  
VOUT=5.0V×0.96  
EXT=0.4V  
Open-Loop Test  
VIN=4.5V  
V
20  
0
0
2-5  
0
25  
50 100  
75  
-50  
200  
400 600  
800  
1000  
0
Temperature℃  
Output Current, IOUT (mA)  
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CMOS IC  
„
TYPICAL CHARACTERISTICS(Cont.)  
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.  
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