UC3550 [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
| 型号： | UC3550 |
| 厂家： | 
Unisonic Technologies |
| 描述： | PWM CONTROLLED，PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER |
| 文件： | 总10页 (文件大小：194K) |
| 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 CONTROLLED，
PWM/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.
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
SOT-25
*Pb-free plating product number: UC3550L
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 range：0.9~8V
* Output voltage range：1.8~6V 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
Normal
Lead Free Plating
UC3550-xx-AF5-R
UC3550L-xx-AF5-R
Tape Reel
UC3550L-xx-AF5-R
(1)Packing Type
(2)Package Type
(3)Voltage Code
(4)Lead Plating
(1) R: Tape Reel
(2) AF5: SOT-25
(3) xx: reference to Marking Information
(4) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd
QW-R502-082,A
UC3550
CMOS IC
ꢀ
MARKING INFORMATION
PACKAGE VOLTAGE CODE
MARKING
2
3
1
33:3.3V
SOT-25
U5XX
50:5.0V
Voltage Code
Lead Plating
4
5
ꢀ
PIN CONFIGURATION
NC OUT CE
3
2
1
4
5
GND
EXT
ꢀ
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
OUT 2
+
-
PWM
COMP
Buffer
driver
5 EXT
NC 3
Error
Amplifier
-
Ramp
~5mV
+
Skip
COMP
Oscillator
120nA
Voltage reference
and soft start
GND 4
CE 1
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UC3550
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
Junction Temperature
Operating Temperature
Storage Temperature
-150 ~ +150
-0.3 ~ 12.0
-155 ~ 155
500
mA
V
VCE
ICE
mA
mW
℃
℃
)
PD
TJ
+150
TOPR
TSTG
-40 ~ +85
-55 ~ +150
℃
℃
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
Thermal Resistance Junction to Air
SYMBOL
RATINGS
250
UNIT
/W
θJA
℃
ꢀ
ELECTRICAL CHARACTERISTICS (Ta=25
UC3550-3.3V
PARAMETER
℃, fOSC＝300kHz, unless otherwise specified)
SYMBOL
TEST CONDITIONS
MIN
240
70
TYP
MAX
360
UNIT
kHz
OSCILLATOR
Frequency
fOSC
VOUT=VSET×0.96
Ta=-40 ~ 85
VOUT=VSET×0.96
300
0.10
80
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
△f
℃
℃
%/℃
DMAX
90
%
VSTART1 IOUT=0mA
VSTART2 IOUT=1mA
800
900
900
mV
mV
1000
△
VSTART Ta=-40
℃
~ 85℃
-1.6
mV/℃
VOPR
tSS
IOUT=0mA
600
60
700
250
mV
ms
VOUT=VSET
CE (PIN 1)
CE Input Voltage
：
VCEH
VCEL
900
mV
mV
High State, Device Enabled
Low State, Device Disabled
VOUT=VSET×0.96
680
CE Input Current
：
µA
µA
VOUT=VCE=5.0V
-0.5
0
0
0.5
0.5
High State, Device Enabled
Low State, Device Disabled
ICEH
ICEL
VOUT=5.0V, VCE=0V
0.15
EXT (PIN 5)
EXT “H”
EXT “L”
REXTH
REXTL
VEXT=VOUT-0.4V
VEXT=0.4V
11
8
15
12
Ω
Ω
ON Resistance
TOTAL DEVICE
Output Voltage
VOUT
3.218
3.3
3.383
V
Output Voltage
△
VOUT Ta=-40 ~ 85
℃
150
ppm/℃
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
VOUT=5.0V, VCE=0V,
IOFF
Off-State Current
Efficiency
0.6
88
1.5
µA
%
Ta=-40 ~ +85
℃
η
IOUT = 200mA, VIN = 2.0V
80
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UC3550
CMOS IC
ꢀ
ELECTRICAL CHARACTERISTICS (Cont.)
UC3550-5.0V
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
240
70
TYP
MAX
UNIT
kHz
OSCILLATOR
Frequency
fOSC
VOUT=VSET×0.96
Ta=-40 ~ 85
VOUT=VSET×0.96
300
0.1
80
360
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
△f
℃
℃
%/℃
DMAX
90
900
1
%
VSTART1 IOUT=0mA
VSTART2 IOUT=1mA
800
900
mV
V
△
VSTART Ta=-40
℃
~ 85℃
-1.6
mV/℃
VOPR
tSS
IOUT=0mA
600
60
700
200
mV
ms
VOUT=VSET
CE (PIN 1)
CE Input Voltage
：
VCEH
VCEL
900
mV
mV
High State, Device Enabled
Low State, Device Disabled
VOUT=VSET×0.96
680
CE Input Current
：
High State, Device Enabled
Low State, Device Disabled
ICEH
ICEL
VOUT=VCE=5.0V
-0.5
0
0
0.5
0.5
µA
µA
VOUT=5.0V, VCE=0V
0.15
EXT (PIN 5)
EXT “H”
EXT “L”
REXTH VEXT=VOUT-0.4V
REXTL VEXT=0.4V
6
6
10
10
Ω
Ω
ON Resistance
TOTAL DEVICE
Output Voltage
VOUT
4.875
5
5.125
V
Output Voltage temperature
coefficient
△
VOUT Ta=-40 ~ 85
℃
150
ppm/℃
Operating Current
Stand-by Current
IDD
VOUT=VCE=VSET×0.96
136
15
220
38
µA
µA
ISTN-BY VOUT=VCE=VSET+0.5V
VOUT=5.0V, VCE=0V,
IOFF
Off-State Current
Efficiency
0.6
88
1.5
µA
%
Ta=-40 ~ +85
℃
η
IOUT = 200mA, VIN = 2.0V
80
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UC3550
CMOS IC
ꢀ
TYPICAL STEP-UP CONVERTER APPLICATION
10uH
VIN
VOUT
220uF
CE
EXT
1
OUT
2
5
UTC
UC3550
GND
NC
10uF
0.1µ
3
4
Step -up Converter using external MOSFET
10uH
VIN
VOUT
220 uF
Cb 3000P
EXT
CE
1
5
OUT
Rb 560
UTC
UC3550
2
NC
GND
10uF
0.1µ
3
4
Step -up Converter using external NPN
Recommended components
NmosTr
L
：XP161A0390PR/ (Torex) or NTGS3446T1（ON SEMI）
：
10Uh(sunida CD54 fosc
＝300kHz)
SD
Cin
CL
：MA737, or MBRM110L
：
10V 10uF (tantalum)
：
16V220uF (tantalum)
NPN Tr type
Tr
Rb
Cb
：
2SD1628(Sanyo)
，
MMJT9410
1000Ω(Adjust according to load and Tr. hFE levels)
ceramic type
：
：
500
3000p
～
（
）
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UC3550
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
output filter capacitor ESR . The inductor’s DC resistance significantly affects efficiency.
（
x
）
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 10
ꢀF 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 RDS ON
(
),typically<0.1Ω, threshold voltage,
VGS 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
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)
Current vs. Input Voltage (Using BJT)
100
10
10
1
VOUT=5.0V,
Rb=560Ω
1
VOUT=5.0V
0.1
0.1
VOUT=3.0V,
Rb=560Ω
VOUT=3.0V
0.01
1
0.01
1
2
5
3
4
2
3
4
5
6
InputVoltage, VIN (V)
Input Voltage, VIN (V)
Off-State Currentvs. VOUT
Output Voltage vs. Output Current
VIN=2.0V
1.0
0.8
0. 6
0. 4
5.2
VCE = 0 V
Open-Loop Test
5.1
5.0
4.9
VIN=3.0V
VIN=0.9V
0.2
0. 0
4. 8
4.7
Ta=25℃
2
3
4
5
6
1
0
200
400
600
800 1000
Output Current, IOUT (mA)
VOUT (V)
Maximum Duty Cycle vs. Temperature
Output Voltage vs. Output Current
3.5
3.4
100
90
80
70
60
50
0
3.3
3.2
VIN=1.2V
VIN=0.9V
VIN=2.0V
3.1
Open- Loop Test
3.0
0
-25
0
25
50
100
-50
75
200
400
600
800
1000
Output Current, IO (mA)
Temperature (℃)
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UC3550
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
VEXT =0.4V
VIN=4.5V
Open-Loop Test
20
0
0
-50
2-5
0
25
50
75 100
0
200
400 600
8001000
Temperature℃
Output Current, IOUT (mA)
Oscillator Frequency vs. Temperature
VOUT=3.3V
Oscillator Frequency vs. Temperature
VOUT=5V
600
500
400
300
600
500
400
300
200
100
0
200
100
0
-50 -25
0
25
50
75
100
-50 -25
0
25
50
75 100
Temperature (℃)
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UC3550
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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