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PDF U8021 Data sheet ( Hoja de datos )
| Número de pieza | U8021 | |
| Descripción | VOLTAGE MODE PWM CONTROLLER | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UNISONIC TECHNOLOGIES CO., LTD
U8021
Preliminary
VOLTAGE MODE PWM
CONTROLLER WITH LINEAR
POWER REGULATOR
DESCRIPTION
The UTC U8021 provides the control and protection features
necessary for a synchronous buck converter and a linear
regulator in high performance graphic card applications.
The UTC U8021 is designed to directly drive the high and low
MOSFETs of the buck converter. It allows the converter to
operate with 4V~25V power rail and as low as 0.5V output. The
UTC U8021 is capable to drive a N-type MOSFET in a linear
regulator with as low as 0.5V output.
The UTC U8021 features soft-start, UVLO, and OCP. The
UTC U8021 monitors the output current by using the Rdson of the
low MOSFET in the buck converter that eliminates the need for a
current sensing resistor.
FEATURES
* 4V~25V power rails
* Internal LDO
* 1.5A gate drive current
* Adaptive non-overlapping gate drives provide shoot-through
protection for MOSFETs
* Programmable output voltages
* Internal soft start
* Under voltage lockout
* Short circuit protection
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
U8021L-S14-T
U8021G-S14-T
U8021L-S14-R
U8021G-S14-R
Package
SOP-14
SOP-14
CMOS IC
Packing
Tube
Tape Reel
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 6
QW-R502-A13.a
Free Datasheet http://www.Datasheet4U.com
1 page  
U8021
Preliminary
CMOS IC
ELECTRICAL CHARACTERISTICS
(Unless specified: VCC= 5V~16V, VFB=VOUT, VBST-VPN=5V~8.2V, TA=-25°C~85°C)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP
General
VCC Supply Voltage
VCC Quiescent Current
VCC Under Voltage Lockout
BST to PN Supply Voltage
BST Quiescent Current
Internal LDO
LDO Output
Dropout Voltage
Linear Section
Reference Voltage
Load Regulation
Line Regulation
VCC Supply Rejection
Gate Sourcing Current
Gate Sinking Current
LDFB Input Bias Current
Soft Start Time
Switching Section
Reference Voltage
Load Regulation
Line Regulation
Operating Frequency
Ramp Amplitude (Note 2)
Maximum Duty Cycle (Note 2)
Minimum On-Time (Note 2)
DH Rising/Falling Time
DL Rising/Falling Time
DH, DL Nonoverlapping Time
VCC
IQVCC
UVVCC
VBST_PN
IQBST
VCC=12V, VBST-VPN=8.2V
VHYST=100mV
VCC=12V, VBST-VPN=8.2V
4
5
4
VDRV
VDROP
8.6V<VCC<16V
4V<VCC<8.6V
8
0.4
VOL LDFB=VOL, TA=25°C, VCC=12V 0.65 0.75
IO=0~1A, VIN=3.3V, VCC=12V
VIN=3.2V~3.4V, VCC=12V
VIN=3.3V, VCC=10V~14V
VGATE=6.5V
1
VGATE=6.5V
1
LDFB=.5V
-0.2
VIN=3.3V, VCC=12V TA=25°C
1.5
VREF
FS
Vm
DMAX
TON_MIN
tSRC_DH
tSINK_DH
tSRC_DL
tSINK_DL
TA=25°C, VCC=12V
IO=0.2~4A
VCC=10V~14V
6V Swing at CL=3.3nF,
VBST-VPN=8.2V
6V Swing at CL=3.3nF,
VDRV=8.2V
0.495
500
0.500
0.4
0.4
600
0.8
97
125
40
25
30
40
30
Voltage Error Amplifier
Output Source Current
0.9
Output Sink Current
0.9
Notes: 1. This device is ESD sensitive. Use of standard ESD handling precautions is required.
2. Guaranteed by design, not tested in production.
MAX
16
7
4
10
3
0.85
0.4
0.4
0.4
-1.0
0.505
700
UNIT
V
mA
V
V
mA
V
V
V
%
%
%
mA
mA
uA
ms
V
%
%
KHz
V
%
ns
ns
ns
ns
mA
mA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 6
QW-R502-A13.a
Free Datasheet http://www.Datasheet4U.com
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet U8021.PDF ] | |
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