Datasheet

UNISONIC TECHNOLOGIES CO., LTD
USR1051
Preliminary
LINEAR INTEGRATED CIRCUIT
3 A SYNCHRONOUS BUCK
REGULATOR
„
DESCRIPTION
The UTC USR1051 is a high efficiency, 3A synchronous buck
regulator. The UTC USR1051 works from 5V to 23V input voltage
range, and provides up to 3A of continuous output current with an
output voltage adjustable down to 0.8V.
The UTC USR1051 comes in an exposed pad HSOP-8
package and is rated over a -40°C~+85°C operating ambient
temperature range.
„
HSOP-8
FEATURES
* Synchronous Buck
* 5V~23V operating input voltage range
* High efficiency
* Internal soft start
* Output voltage adjustable to 0.8V
* 3A continuous output current
* Cycle-by-cycle current limit
* 400kHz PWM operation
* Pre-bias start-up
* Thermal shutdown
* Short-circuit protection
* Exposed pad HSOP-8 package
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
USR1051L-SH2-T
USR1051G-SH2-T
USR1051L-SH2-R
USR1051G-SH2-R
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Copyright © 2013 Unisonic Technologies Co., Ltd
Package
Packing
HSOP-8
HSOP-8
Tube
Tape Reel
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USR1051
Preliminary
„
PIN CONFIGURATION
„
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
Exposed pad
„
PIN NAME
PGND
VIN
AGND
FB
COMP
EN
NC
NC
LX
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
Power ground
Supply voltage input
Analog ground
Feedback input
External loop compensation pin
Enable pin
No Connect Pin.
No Connect Pin.
Switching node
BLOCK DIAGRAM
VIN
EN
Start Up
VREF
REF_0.8V
FB
EA
Current
Source
Bias
SENSE
OSC
SLOPE
Driver
PWM
PWM
LATCH
Dead Time
Control
LX
Driver
COMP
UNISONIC TECHNOLOGIES CO., LTD
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AGND
PGND
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USR1051
„
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
23
V
LX to AGND
-0.7~VIN+0.3
V
LX to AGND (20ns)
-5~22
V
EN to AGND
-0.3~VIN+0.3
V
FB, SS, COMP to AGND
-0.3~6.0
V
PGND to AGND
-0.3~+0.3
V
Ambient Temperature
TA
-40~+85
°C
Junction Temperature
TJ
+150
°C
Storage Temperature
TSTG
-65~+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
PARAMETER
Junction to Ambient (Note 2)
„
SYMBOL
θJA
UNIT
°C/W
RATINGS
5~23
0.8~0.85×VIN
UNIT
V
V
RECOMMENDED OPERATING CONDIIONS
PARAMETER
SYMBOL
VIN
VOUT
Supply Voltage
Output Voltage
„
RATING
50
ELECTRICAL CHARACTERISTICS (Note 3)
(TA=25°C, VIN=VEN=12V, VOUT=3.3V, unless otherwise specified)
PARAMETER
Supply Voltage
Supply Current (Quiescent)
Shutdown Supply Current
Feedback Voltage
Load Regulation
Line Regulation
Feedback Voltage Input Current
EN Input Threshold
SS Time
MODULATOR
Frequency
Maximum Duty Cycle
Controllable Minimum On Time
Current Sense Transconductance
Error Amplifier Transconductance
PROTECTION
Current Limit
SYMBOL
TEST CONDITIONS
VIN
IIN
IOUT=0, VFB=1.2V, VEN>2V
IOFF
VEN=0V
VFB
TA=25 °C
MIN
5
0.788
TYP
3.5
1
0.8
0.5
1
IFB
VEN
Off Threshold
On Threshold
CSS=16nF
fO
DMAX
TMIN
2
2
380
85
450
MAX UNIT
23
V
5
mA
10
µA
0.812
V
%
%
200
nA
0.6
V
V
ms
550
150
7
180
kHz
%
ns
A/V
µA/V
3.5
4.5
A
TJ Rising
150
°C
Over-Temperature Shutdown Limit
100
°C
TJ Falling
Notes: 1. Devices are inherently ESD sensitive, handling precautions are required. Human body model rating: 1.5
kΩ in series with 100pF.
2. The value of θJA is measured with the device mounted on a 1-in2 FR-4 board with 2oz. Copper, in a still air
environment with TA=25°C. The value in any given application depends on the user’s specific board
design.
3. Specification in BOLD indicate an ambient temperature range of -40°C~+85°C. These specifications are
guaranteed by design.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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USR1051
„
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
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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