AT1366
Preliminary Product Information
1MHz,800mA Synchronous Buck Controller
Features
• High efficiency (95%) possible
• No Schottky Diode Required
• 800mA Output Current at 5V input 3.3V output
• Oscillation frequency 1.0MHz
• Built-in ON/OFF Function
• Low Dropout Operation: 100% Duty Cycle
• Stand-by current max. 1µA
• Input voltage: 2.5V ~5.5V
General Description
The AT1366 provides complete control for a
DC/DC converter optimized for high-performance
microprocessor applications. It is operated on
current mode architecture for excellent line and
load transient response. 1MHz operation frequency
is allowing the use of small surface mount inductor
and capacitor. The internal synchronous switch
increases efficiency and eliminates the need for an
external Schottky diode. The AT1366 is a family
of low-noise synchronous step-down DC/DC
converters that is ideally suited for systems
powered from a 1-cell Li-ion battery or from a
3-cell to 4-cell NiCd, NiMH, or alkaline battery. It
can also be used to USB-Based power system.
Applications
• Power Supply for portable devices
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
05/04/21
1
AT1366
Preliminary Product Information
1MHz,800mA Synchronous Buck Controller
Pin Configuration
Ordering Information
Part number
AT1366X
AT1366X_GRE
: Date Code
Package
SOT-25
SOT-25, Green
Marking
, Date Code with one bottom line
Pin Description
Symbol
Pin No.
Descript
RUN
GND
SW
VIN
FB
1
2
3
4
5
ON/OFF Control
Power ground
Switch Node Connection to Inductor
Power Supply
Output Feedback
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
05/04/21
2
AT1366
Preliminary Product Information
1MHz,800mA Synchronous Buck Controller
Absolute Maximum Ratings
Parameter
Power Supply Voltage
Input Pin Voltage
P-Channel Switch Source Current
(DC)
N-Channel Switch Sink Current
(DC)
Peak SW Sink and Source Current
Thermal Resistance from Junction
to Ambient
θ
JA
Operating temperature T
A
Storage temperature
Condition
—
RUN,FB
SW
—
—
—
SOT25
—
—
Rated Value
Min.
Max.
-0.3
+6.0
-0.3
VIN
-0.3 VIN+0.3
-
1000
-
-
-
-35
-55
1000
1.5
165
+85
+150
0
Unit
V
V
V
mA
mA
A
C/W
0
0
C
C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Recommended Operating Conditions
(Ta=+25
0
C)
Parameter
Power supply voltage
Operating temperature*
Operating junction temperature
*Using X5R or X7R input capacitors.
Symbol
V
IN
T
A
T
J
Min.
2.5
-20
-
Values
Typ.
--
+25
-
Max.
5.5
+85
+150
Unit
Ｖ
°C
°C
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
05/04/21
3
AT1366
Preliminary Product Information
1MHz,800mA Synchronous Buck Controller
Electrical Characteristics
(VIN = 3.6V,Ta =+25℃ , unless otherwise noted. )
Parameter
Input Supply Range
Quiescent Current
*
Current in standby mode
Feedback Voltage
Feedback Voltage
line-regulation
Feedback Variation
with Temperature
Feedback current
Peak Inductor Current*
Maximum Output
Current*
Oscillator Frequency
RDS(ON) of P-Channel
MOSFET
RDS(ON) of N-Channel
MOSFET
SW Leakage Current
RUN Threshold
RUN leakage Current
Symbol
V
IN
I
S
I
ST
V
FB
V
FB-Line
Condition
Min.
2.5
FB=0.8V, Iload=0A
Active Mode
RUN=0V, VIN=5.5V
Ta =-20℃ to +85℃
VCC=2.5V to 5.5V
Ta =-20℃ to +85℃
--
--
0.784
--
--
--
VIN=5V,VOUT=3.3V
VIN=5V±5%, VOUT=3.3V,
L=4.7µH
FB=0.8V
FB=0V
ISW=600mA
ISW=-600mA
RUN=0V,SW=0V or 5V,VIN=5V
1.10
-
0.8
--
--
--
--
0.3
--
Values
Typ.
--
300
0.5
0.800
0.1
0.5
--
1.25
-
1.0
200
0.4
0.35
±0.1
1.0
±0.1
Max.
5.5
--
1
0.816
0.5
1.0
±200
1.50
800
1.2
--
0.5
0.45
±1
1.5
±1
Unit
V
µA
µA
V
%
%
nA
A
mA
MHz
KHz
Ω
Ω
µA
V
µA
I
FB
I
PK
I
O
fosc1
fosc2
R
PFET
R
NFET
I
LSW
V
RUN
I
RUN
*
I
PK
=
I
O
+
(
V
−
V
OUT
)
×
t
ON
∆
I
=
I
O
+
IN
2
2
×
L
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
05/04/21
4
AT1366
Preliminary Product Information
1MHz,800mA Synchronous Buck Controller
Typical Application Circuit
L1:ABC SH40284R7YSB
Figure 1
L1:ABC SH40284R7YSB
Figure 2
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email:
service@aimtron.com.tw
05/04/21
5
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