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Block Diagram
UVLO
EN
& POR
Reference
& Bias
SS
+
0.8V
FB
–
COMP
Absolute Maximum Ratings
Exceeding the Absolute Maximum Ratings may damage the
device.
Parameter
Supply Voltage (V
)
IN
LX to AGND
LX to AGND (20 ns)
EN to AGND
FB, SS, COMP to AGND
PGND to AGND
Junction Temperature (T
)
J
Storage Temperature (T
)
S
(1)
ESD Rating
Note:
1. Devices are inherently ESD sensitive, handling precautions are
required. Human body model rating: 1.5 k
Rev. 1.0 June 2011
Internal
5V LDO
+5V
Regulator
Softstart
SS
5μA
+
PWM
EAmp
–
Comp
+
500kHz
Oscillator
Rating
20 V
-0.7 V to V
+0.3 V
IN
-5 V to 22 V
-0.3 V to V
+0.3 V
IN
-0.3 V to 6.0 V
-0.3 V to +0.3 V
+150 °C
-65 °C to +150 °C
2.0 kV
in series with 100 pF.
www.aosmd.com
OTP
ISen
ILimit
Level
PWM
Shifter
Control
+
Logic
FET
Driver
AGND
Recommended Operating Conditions
The device is not guaranteed to operate beyond the Maximum
Recommended Operating Conditions.
Parameter
Supply Voltage (V
)
IN
Output Voltage Range
Ambient Temperature (T
)
A
Package Thermal Resistance
Exposed Pad SO-8 (
)
JA
Note:
2. The value of
is measured with the device mounted on a 1-in
JA
FR-4 board with 2 oz. Copper, in a still air environment with
T
= 25 °C. The value in any given application depends on the
A
user's specific board design.
AOZ1051PI
VIN
+
–
Q1
LX
Q2
PGND
Rating
4.5 V to 18 V
0.8 V to 0.85 • V
-40 °C to +85 °C
(2)
50 °C/W
Page 3 of 14
IN
2
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