UCS1201L-S08-T [UTC]
LOW VOLTAGE SYNCHRONOUS BUCK CONTROLLER;
| 型号： | UCS1201L-S08-T |
| 厂家： | 
Unisonic Technologies |
| 描述： | LOW VOLTAGE SYNCHRONOUS BUCK CONTROLLER |
| 文件： | 总5页 (文件大小：166K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
UCS1201
Preliminary
LINEAR INTEGRATED CIRCUIT
LOW VOLTAGE
SYNCHRONOUS BUCK
CONTROLLER
DESCRIPTION
The UTC UCS1201 is a low voltage buck controller. It
provides the control for a DC-DC power solution producing an
output voltage as low as 0.980V over a wide current range. The
UTC UCS1201 operates at a default switching frequency of
200kHz, but switching frequency is user-programmable with an
additional resistor between ROSC and ground. This device
provides undervoltage lockout protection, soft-start, and is
assembled in an SOP-8 package.
SOP-8
FEATURES
* 0.980V±1.0% reference voltage
* 200ns transient response
* soft-start
* 200kHz oscillator frequency (No external resistor required)
* UVLO
* OVP through synchronous MOSFETs
* Synchronous N-Channel buck design
ORDERING INFORMATION
Ordering Number
Lead Free
Package
Packing
Halogen Free
UCS1201L-S08-R
UCS1201L-S08-T
UCS1201G-S08-R
UCS1201G-S08-T
SOP-8
SOP-8
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
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UCS1201
Preliminary
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
PIN NAME
VCC
DESCRIPTION
1
2
3
4
5
6
7
8
Power supply input.
ROSC
Frequency adjust pin.
No connect.
NC
COMP
GATE(H)
GATE(L)
VFB
Error amp output.
High-side switch FET driver pin.
Low-side synchronous FET driver pin.
Feedback voltage
GND
Ground
BLOCK DIAGRAM
UVLO
VCC
COMP
VFB
-
+
Latch
+
8.5V/7.5V
-
-
+
+
-
0.25V
Error Amp
PWM Comp
-
-
GATE(H)
+
Driver
+
Latch
+
-
0.98V
GATE(L)
NC
Oscillator
200kHz
-
0.465V
Σ
Frequency
Adjust
ROSC
GND
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UCS1201
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
TJ
RATINGS
150
UNIT
°C
Operating Junction Temperature
Storage Temperature Range
TSTG
-65~150
°C
Notes: 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
θJA
RATINGS
165
UNIT
°С/W
°С/W
Junction to Ambient
Junction to Case
θJC
48
MAXIMUM RATING
PARAMETER
SYMBOL
VCC
VMAX
20V
VMIN
ISOURCE
N/A
ISINK
1.5A Peak,
450mA DC
10mA
IC Power Input
-0.5V
Compensation Capacitor
Voltage Feedback Input
Frequency Adjust
COMP
VFB
6.0V
6.0V
6.0V
-0.5V
-0.5V
-0.5V
10mA
1.0mA
1.0mA
1.0mA
ROSC
1.0mA
-0.5V, -2.0V 1.5A Peak, 1.5A Peak,
for 50ns 200mA DC 200mA DC
-0.5V, -2.0V 1.5A Peak, 1.5A Peak,
High-Side FET Driver
Low-Side FET Driver
Ground
GATE(H)
GATE(L)
GND
20V
20V
0.5V
for 50ns
200mA DC 200mA DC
1.5A Peak,
N/A
-0.5V
450mA DC
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UCS1201
Preliminary
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS
(0°C<TJ<125°C, 9.0V<VCC<20V, CGATE(H)=CGATE(L)=3.3nF, CCOMP=0.1μF, ROSC=74kΩ, unless otherwise specified.)
(Note 1)
PARAMETER
Error Amplifier
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
VFB Bias Current
IFB
VFB=0V
0.4
30
30
2.0
60
60
μA
μA
μA
V
COMP Source Current
COMP Sink Current
ISOURCE COMP=1.5V, VFB=0.8V
ISINK COMP=1.5V, VFB=1.2V
15
15
COMP=VFB
VREF
0.970 0.980 0.990
0.965 0.980 0.995
Reference Voltage
TJ<25°C
V
COMP Max Voltage
COMP Min Voltage
COMP Fault Discharge
Current at UVLO
COMP Fault Discharge
Threshold to Reset UVLO
GATE(H) and GATE(L)
Rise Time
VCOMP-MAXVFB=0.8V
VCOMP-MIN VFB=1.2V
2.4
3.1
0.1
V
0.2
V
ICHARGE COMP=1.2V, VCC=6.9V
VRESET
0.5
0.1
1.2
mA
V
0.25
0.3
tR
tF
1.0V<GATE(L), GATE(H)<VCC-2.0V, VCC=12V
40
40
80
80
ns
ns
Fall Time
VCC-2.0V<GATE(L), GATE(H)<1.0V, VCC=12V
GATE(H) to GATE(L)
Delay
tDH
tDL
GATE(H)<2.0V, GATE(L)>2.0V
40
40
60
105
105
ns
GATE(L) to GATE(H)
Delay
GATE(L)<2.0V, GATE(H)>2.0V
60
ns
ns
V
Minimum Pulse Width
tPULSE GATE(X)=4.0V
250
Measure GATE(L) or GATE(H)
0.5nF<CGATE(H)=CGATE(L)<10nF, (Note 2)
Measure GATE(L) or GATE(H)
High Voltage (AC)
VH
VL
V
CC-0.5 VCC
Low Voltage (AC)
0
0.5
V
0.5nF<CGATE(H)=CGATE(L)<10nF, (Note 2)
PWM Comparator
VFB=0V, Increase COMP Until GATE(H) Starts
Switching
PWM Comparator Offset VPWM-MIN
0.415 0.465 0.525
80
V
Ramp Max Duty Cycle
Artificial Ramp
%
mV
ns
V
Duty Cycle=50%, ROSC=74kΩ
COMP=1.5V, VFB 20mV Overdrive. (Note 2)
(Note 3)
50
63
75
300
1.4
Transient Response
VFB Input Range
Oscillator
200
0
FOSC ROSC Not Used
FOSC ROSC=74kΩ
General Electrical Specifications
170
240
200
280
230
320
kHz
kHz
Switching Frequency
VCC Supply Current
Start Threshold
Stop Threshold
Hysteresis
IQ
COMP=0V (No Switching)
9.0
8.5
7.5
1.0
12
9.0
mA
V
GATE(H) Switching, COMP Charging
GATE(H) Not Switching, COMP Discharging
8.0
7.0
8.0
V
VHYS Start-Stop
0.75
1.25
V
Notes:1.Characteristics at temperature extremes are guaranteed via correlation using quality statistical control
methods.
2.Guaranteed by design. Not tested in production.
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UCS1201
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
12V
L1
1.0µH
D3
BAS20HT1
+
+
C1
C2
1000µF/16V
1000µF/16V
D2
BAV99LT1
R1
C3
0.1µF
470
C11
0.1µF
Q3
MMBT3904LT1
U1
2.5V/10A
C9
0.01µF
D1
18V Zener
BZX84C18V
VCC
GND
Q1
C4
1.0µF
ROSC
NC
VFB
GATE(L)
GATE(H)
UT60N03
L2
COMP
4.7µH
R3
Opition
UTC UCS1201
+
Q2
104
C11
0.1µF
1000µF*2
R6
UT110N03
R5
0.98V
3.32k
5.11k
C10
4700pF
5V
12V
33µF
UT65N03
1.4µH
1.2V/10A
56µF
UTC UCS1201
VCC
GND
VFB
1000pF
ROSC
NC
2.26k
UT65N03
GATE(L)
GATE(H)
COMP
option
0.1µF
0.1µF
10k
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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