Datasheet

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
Halogen Free
UCS1201L-S08-R
UCS1201G-S08-R
UCS1201L-S08-T
UCS1201G-S08-T
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Copyright © 2013 Unisonic Technologies Co., Ltd
Package
Packing
SOP-8
SOP-8
Tape Reel
Tube
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QW-R103-066.a
UCS1201
Preliminary
„
PIN CONFIGURATION
„
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
„
PIN NAME
VCC
ROSC
NC
COMP
GATE(H)
GATE(L)
VFB
GND
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
Power supply input.
Frequency adjust pin.
No connect.
Error amp output.
High-side switch FET driver pin.
Low-side synchronous FET driver pin.
Feedback voltage
Ground
BLOCK DIAGRAM
VCC
-
UVLO
+
Latch
+
- 8.5V/7.5V
-
COMP
+
+
- 0.25V
Error Amp
VFB
-
-
+
PWM Comp
Driver
+
GATE(H)
Latch
+
- 0.98V
GATE(L)
NC
+
0.465V
Σ
Oscillator
200kHz
GND
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Frequency
Adjust
ROSC
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UCS1201
„
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Operating Junction Temperature
TJ
150
°C
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
Junction to Ambient
Junction to Case
„
SYMBOL
θJA
θJC
RATINGS
165
48
UNIT
°С/W
°С/W
MAXIMUM RATING
PARAMETER
SYMBOL
VMAX
VMIN
ISOURCE
VCC
20V
-0.5V
N/A
COMP
VFB
ROSC
6.0V
6.0V
6.0V
High-Side FET Driver
GATE(H)
20V
Low-Side FET Driver
GATE(L)
20V
-0.5V
-0.5V
-0.5V
-0.5V, -2.0V
for 50ns
-0.5V, -2.0V
for 50ns
GND
0.5V
10mA
1.0mA
1.0mA
1.5A Peak,
200mA DC
1.5A Peak,
200mA DC
1.5A Peak,
450mA DC
IC Power Input
Compensation Capacitor
Voltage Feedback Input
Frequency Adjust
Ground
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
-0.5V
ISINK
1.5A Peak,
450mA DC
10mA
1.0mA
1.0mA
1.5A Peak,
200mA DC
1.5A Peak,
200mA DC
N/A
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„
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
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNIT
Error Amplifier
VFB Bias Current
IFB
VFB=0V
0.4
2.0
μA
COMP Source Current
ISOURCE COMP=1.5V, VFB=0.8V
15
30
60
μA
COMP Sink Current
ISINK COMP=1.5V, VFB=1.2V
15
30
60
μA
COMP=VFB
0.970 0.980 0.990
V
Reference Voltage
VREF
TJ<25°C
0.965 0.980 0.995
V
COMP Max Voltage
VCOMP-MAX VFB=0.8V
2.4
3.1
V
COMP Min Voltage
VCOMP-MIN VFB=1.2V
0.1
0.2
V
COMP Fault Discharge
ICHARGE COMP=1.2V, VCC=6.9V
0.5
1.2
mA
Current at UVLO
COMP Fault Discharge
VRESET
0.1
0.25
0.3
V
Threshold to Reset UVLO
GATE(H) and GATE(L)
Rise Time
tR
1.0V<GATE(L), GATE(H)<VCC-2.0V, VCC=12V
40
80
ns
Fall Time
tF
VCC-2.0V<GATE(L), GATE(H)<1.0V, VCC=12V
40
80
ns
GATE(H) to GATE(L)
tDH
GATE(H)<2.0V, GATE(L)>2.0V
40
60
105
ns
Delay
GATE(L) to GATE(H)
tDL
GATE(L)<2.0V, GATE(H)>2.0V
40
60
105
ns
Delay
Minimum Pulse Width
tPULSE GATE(X)=4.0V
250
ns
Measure GATE(L) or GATE(H)
VCC-0.5 VCC
High Voltage (AC)
VH
V
0.5nF<CGATE(H)=CGATE(L)<10nF, (Note 2)
Measure GATE(L) or GATE(H)
0
0.5
V
Low Voltage (AC)
VL
0.5nF<CGATE(H)=CGATE(L)<10nF, (Note 2)
PWM Comparator
VFB=0V, Increase COMP Until GATE(H) Starts
0.415 0.465 0.525
V
PWM Comparator Offset VPWM-MIN
Switching
Ramp Max Duty Cycle
80
%
Artificial Ramp
Duty Cycle=50%, ROSC=74kΩ
50
63
75
mV
Transient Response
COMP=1.5V, VFB 20mV Overdrive. (Note 2)
200
300
ns
VFB Input Range
(Note 3)
0
1.4
V
Oscillator
170
200
230
kHz
FOSC ROSC Not Used
Switching Frequency
FOSC ROSC=74kΩ
240
280
320
kHz
General Electrical Specifications
VCC Supply Current
IQ
COMP=0V (No Switching)
9.0
12
mA
Start Threshold
GATE(H) Switching, COMP Charging
8.0
8.5
9.0
V
Stop Threshold
GATE(H) Not Switching, COMP Discharging
7.0
7.5
8.0
V
Hysteresis
VHYS Start-Stop
0.75
1.0
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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„
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
12V
L1
1.0µH
D3
BAS20HT1
C1 +
1000µF/16V
D2
BAV99LT1
R1
470
C11
Q3
MMBT3904LT1
0.1µF
D1
18V Zener
BZX84C18V
C3
0.1µF
U1
VCC
C4
1.0µF
ROSC
NC
COMP
R3
Opition
+
C2
1000µF/16V
GND
2.5V/10A
C9 0.01µF
Q1
VFB
UT60N03
GATE(L)
GATE(H)
L2
4.7µH
UTC UCS1201
+
Q2
C11
0.1µF
1000µF*2
UT110N03
R5
0.98V
104
R6
3.32k
5.11k
C10
4700pF
5V
12V
33µF
UT65N03
1.4µH
1.2V/10A
UTC UCS1201
VCC
GND
ROSC
NC
COMP
VFB
1000pF
UT65N03
2.26k
GATE(L)
GATE(H)
56µF
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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