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UM1660S PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UM1660S
기능 Low Power DC/DC Boost Converter
제조업체 Union Semiconductor
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UM1660S 데이터시트, 핀배열, 회로
UM1660
Low Power DC/DC Boost Converter
UM1660S SOT23-5
UM1660DA DFN6 2.0×2.0
General Description
The UM1660 is a PFM controlled step-up DC-DC converter with a switching frequency up to
1MHz. The device is ideal to generate output voltage for small to medium LCD bias supplies and
white LED backlight supplies from a single cell Li-Ion battery. The part can also be used to
generate standard 3.3V/5V to 12V power conversions.
With a high switching frequency of 1MHz, a low profile and small board area solution can be
achieved using a chip coil and an ultra small ceramic output capacitor. The UM1660 has an
internal 400mA switch current limit, offering lower output voltage ripple. The low quiescent
current (typically 36µA) together with an optimized control scheme, allows device operation at
very high efficiencies over the entire load current range.
Applications
Features
LCD Bias Supply
White LED Supply for LCD Backlights
Digital Still Camera
PDAs, Organizers and Handheld PCs
Cellular Phones
Standard 3.3V/5V to 12V Conversion
2.0V to 6.0V Input Voltage Range
Adjustable Output Voltage up to 28V
400mA Internal Switch Current
Up to 1MHz Switching Frequency
36µA Typical No Load Quiescent Current
1µA Maximum Shutdown Current
Internal Soft-Start
Available in Tiny SOT23-5 and DFN6
2.0×2.0 Packages
Pin Configurations
Top View
(Top View)
54
SW 1
5 VIN
PHO
GND 2
FB 3
4 EN
(Top View)
VIN 1
GND 2
EN 3
6 SW
5 NC
4 FB
123
M: Month Code
UM1660S
SOT23-5
AAG
Marking Pin1
M: Month Code
UM1660DA
DFN6 2.0×2.0
________________________________________________________________________
http://www.union-ic.com Rev.05 Feb.2014
1/15




UM1660S pdf, 반도체, 판매, 대치품
UM1660
Electrical Characteristics
(VIN= 2.4 V, EN = VIN, CIN=4.7μF, COUT=1μF, L=10μH, TA = -40°C to 85°C, typical values are
at TA = 25°C, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
SUPPLY CURRENT
VIN
IQ
ISD
VUVLO
Input Voltage Range
Operating Quiescent
Current
Shutdown Current
Under-voltage
Lockout Threshold
IOUT=0mA,
not switching
VFB = 1.3V
EN=GND
2.0 6.0 V
36 70 μA
0.1 1 μA
1.5 1.8 V
ENABLE
VIH
EN High Level Input
Voltage
VIL
EN Low Level Input
Voltage
IL
EN Input Leakage
Current
EN=GND or VIN
1.3 V
0.4 V
0.1 1 μA
POWER SWITCH AND CURRENT LIMIT
VSW
Maximum Switch
Voltage
tON Maximum On Time
28 V
4 6 7.5 μs
tOFF
RDS(ON)
ILIM
Minimum Off Time
MOSFET On
Resistance
MOSFET Leakage
Current
MOSFET Current
Limit
VIN = 2.4V, ISW=50mA
VSW =28V
250
350
400 550 ns
750 1200 mΩ
1 10 μA
400 450 mA
OUTPUT
VOUT
Adjustable Output
Voltage Range
VIN 28
VREF
Internal Voltage
Reference
1.233
IFB
Feedback Input Bias
Current
VFB = 1.3V
1
VFB
Feedback Trip Point
Voltage
2.0V VIN 6.0V 1.196 1.233 1.270
Line Regulation
(Note 4)
2.0V VIN 6.0V ;
VOUT =18V;
ILOAD=10mA
0.05
Load Regulation
(Note 4)
VIN = 2.4V;
VOUT =18V;
0mAIOUT25mA;
0.15
Note 4: The line and load regulation depend on the external component selection.
V
V
μA
V
%/V
%/
mA
________________________________________________________________________
http://www.union-ic.com Rev.05 Feb.2014
4/15

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UM1660S 전자부품, 판매, 대치품
VIN=2.7- 6V
C IN
4.7 µF
PWM
50 Hz to 10kHz
L1
10µH
D1
UM1660
VIN SW
UM1660
D2
30V
(Optional)
EN FB
GND
COUT
1µF
Rs
82Ω
Figure 4.
White LED Supply with Adjustable Brightness Control Using a PWM Signal on the Enable Pin
We also can adjust the white LED brightness using an analog signal on the feedback pin (see
figure 5 below). Add a DC voltage to the FB pin, and adjust the LED current by change the DC
voltage, which control the brightness. The LED current is calculated as:
 I RS
VFB
R1 R2 VADJ
RS R2
R1
VIN=2.7- 6V
L1
10 µH
D1
C IN
4.7 µF
VIN SW
UM1660
D2
30V
(Optional)
VFB
EN FB
GND
Cout*
100nF
R1
Rs
V
ADJ
R2
*A smaller output capacitor value for Cout causes a larger LED ripple
Figure 5.
White LED Supply with Adjustable Brightness Control Using an Analog Signal on the Feedback Pin
________________________________________________________________________
http://www.union-ic.com Rev.05 Feb.2014
7/15

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