UNISONIC TECHNOLOGIES CO., LTD
USR1101
Preliminary
LINEAR INTEGRATED CIRCUIT
5V/12V SYNCHRONOUS
BUCK PWM DC-DC
CONTROLLER
DESCRIPTION
The UTC
USR1101
is a high efficiency synchronous buck
PWM controller, with operating at fixed 300kHz frequency,
Internal soft-start, frequency compensation networks and
integrates all of the control, output adjustment, monitoring and
protection functions into a single package.
Adjustable over-current protection (OCP) monitors the voltage
drop across the R
DS(ON)
of the lower MOSFET for synchronous
buck PWM DC-DC controller.
SOP-8
FEATURES
* Operating with 5V or 12V supply voltage
* Drives all low cost N-channel MOSFETs
* PWM control mode
* 300kHz fixed frequency
* Internal soft-start
* Over-current fault monitor on MOSFET, no current sense
resistor required
* RoHS compliant and 100% lead (Pb)-free
ORDERING INFORMATION
Ordering Number
USR1101G-S08-R
USR1101G-S08-R
(1)Packing Type
(2)Package Type
(3)Green Package
(1) R: Tape Reel
(2) S08: SOP-8
(3) G: Halogen Free and Lead Free
Package
SOP-8
Packing
Tape Reel
MARKING
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USR1101
PIN CONFIGURATION
Preliminary
LINEAR INTEGRATED CIRCUIT
BOOT 1
8 NC
UGATE 2
USR1101
GND 3
7 OPS
6 FB
LGATE 4
5 V
CC
PIN DESCRIPTION
PIN NAME
BOOT
UGATE
GND
LGATE
V
CC
FB
OPS
NC
DESCRIPTION
High-Side gate drive boost
Upper gate driver output
Ground
Lower gate drive output
Supply voltage
Feedback voltage
Over-current setting and shutdown
No bonding
PIN NO.
1
2
3
4
5
6
7
8
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USR1101
BLOCK DIAGRAM
Preliminary
LINEAR INTEGRATED CIRCUIT
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USR1101
PARAMETER
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
16
V
Power Dissipation (T
A
=25°C) (Note 1)
P
D
0.625
W
Storage Temperature
T
STG
-65~150
°C
Junction Temperature
T
J
150
°C
Note: 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
SYMBOL
θ
JA
RATINGS
160
UNIT
°С/W
PARAMETER
Junction to Ambient
RECOMMENDED OPERATING CONDITIONS
(Note 2)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
5±5%,12±10%
V
Ambient Temperature
T
A
0~70
°C
Junction Temperature
T
J
0~125
°C
Notes: 1.
θ
JA
is measured in the natural convection at T
A
=25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
2. The device is not guaranteed to function outside its operating conditions.
ELECTRICAL CHARACTERISTICS
(V
CC
=5V/12V, T
A
=25°C, unless otherwise specified)
SYMBOL
I
CC
V
CCRTH
V
CCHYS
V
REF
f
OSC
∆V
OSC
T
DT
∆
FBUVT
I
OC
T
SS
FB Falling
70
75
40
2.5
TEST CONDITIONS
UGATE and LGATE Open
V
CC
Rising
0.35
V
CC
=12V
V
CC
=12V
V
CC
=12V
0.784
250
MIN
TYP
6
4.1
0.5
0.8
300
1.5
MAX UNIT
15
4.5
mA
V
V
V
kHz
V
P-P
ns
%
μA
ms
PARAMETER
V
CC
Supply Current
Nominal Supply Current
Power-On Reset
POR Threshold
Hysteresis
Switcher Reference
Reference Voltage
Oscillator
Free Running Frequency
Ramp Amplitude
PWM Controller Gate Drivers (V
CC
=12V)
Dead Time
Protection
FB Under-Voltage Trip
OC Current Source
Soft-Start Interval
0.816
350
100
80
45
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USR1101
Preliminary
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION
OCP
Sense the low-side MOSFET’s R
DS(ON)
to set over-current trip point.
Connecting a resistor (R
OCSET
) from this pin to the source of the upper MOSFET and the drain of the lower
MOSFET sets the over-current trip point. R
OCSET
, an internal 40μA current source, and the lower MOSFET on
resistance, R
DS(ON)
, set the converter over-current trip point (I
OCSET
) according to the following equation:
40
A
R
OCSET
0.4V
R
DS(ON)
of the lower MOSFET
I
OCSET
½
Shutdown
Pulling low the OPS pin by a small single transistor can shutdown the UTC
USR1101
PWM controller as shown in
typical application circuit.
TYPICAL APPLICATION CIRCUIT
+5V~+12V
D1
1N4148
UTC USR1101
1
5
C1
1µF
6
3
BOOT
V
CC
FB
GND
UGATE
NC
OPS
LGATE
2
8
7
4
R
OCSET
C2
0.1µF
M1
L1
3µH
V
OUT
C3
1µF
V
IN
R1
10
C4
470µF
M2
C
OUT
1000µF×3
Disable
R2
32
R3
68
R4
C5
200-1k 0.1-0.33µF
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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www.unisonic.com.tw
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