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PDF UC3550 Data sheet ( Hoja de datos )
| Número de pieza | UC3550 | |
| Descripción | PWM/PFM SWITCHABLE STEP-UP DC-DC CONTROLLER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC3550 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
UC3550
CMOS IC
PWM CONTROLLED
PWM/PFM SWITCHABLE
STEP-UP DC-DC CONTROLLER
DESCRIPTION
The UTC UC3550 series is a compact, high efficiency, step-up
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
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.
www.DataSheet4U.com
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)
1
2
3
5
4
SOT-25
*Pb-free plating product number: UC3550L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
UC3550-xx-AF5-R
UC3550L-xx-AF5-R
Package
SOT-25
Packing
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
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 10
QW-R502-082,A
1 page  
UC3550
ELECTRICAL CHARACTERISTICS (Cont.)
UC3550-5.0V
PARAMETER
OSCILLATOR
Frequency
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
CE (PIN 1)
CE Input Voltage
High State, Device Enabled
Low State, Device Disabled
CE Input Current
High State, Device Enabled
Low State, Device Disabled
EXT (PIN 5)
ON Resistance
EXT “H”
EXT “L”
TOTAL DEVICE
Output Voltage
Output Voltage temperature
coefficient
Operating Current
Stand-by Current
Off-State Current
Efficiency
SYMBOL
TEST CONDITIONS
fOSC
f
DMAX
VSTART1
VSTART2
VOUT=VSET×0.96
Ta=-40 ~ 85
VOUT=VSET×0.96
IOUT=0mA
IOUT=1mA
VSTART Ta=-40 ~ 85
VOPR
tSS
IOUT=0mA
VOUT=VSET
VCEH
VCEL
VOUT=VSET×0.96
ICEH
ICEL
VOUT=VCE=5.0V
VOUT=5.0V, VCE=0V
REXTH VEXT=VOUT-0.4V
REXTL VEXT=0.4V
VOUT
VOUT Ta=-40 ~ 85
IDD
ISTN-BY
IOFF
η
VOUT=VCE=VSET×0.96
VOUT=VCE=VSET+0.5V
VOUT=5.0V, VCE=0V,
Ta=-40 ~ +85
IOUT = 200mA, VIN = 2.0V
CMOS IC
MIN TYP MAX UNIT
240 300 360 kHz
0.1 %/
70 80 90 %
800 900 mV
900 1
V
-1.6 mV/
600 700 mV
60 200 ms
900 mV
680 mV
-0.5 0
0 0.15
0.5
0.5
µA
µA
6 10 Ω
6 10 Ω
4.875 5 5.125 V
150 ppm/
136 220
15 38
µA
µA
0.6 1.5 µA
80 88
%
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 10
QW-R502-082,A
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet UC3550.PDF ] | |
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