SwitchReg
TM
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
1
General Description
The AAT1152 SwitchRegTM is a member of
AnalogicTech's Total Power Management ICTM
(TPMICTM) product family. The step-down switch-
ing converter is ideal for applications where high
efficiency, small size, and low ripple are critical.
Able to deliver 1A with internal power MOSFETs,
the current-mode controlled IC provides high effi-
ciency using synchronous rectification. Fully inter-
nally compensated, the AAT1152 simplifies system
design and lowers external parts count.
The AAT1152 features a Power Good (POK) func-
tion which monitors the output, alerting the system
if the output voltage falls out of regulation.
The AAT1152 is available in an MSOP-8 package
and is rated over the -40C to 85C temperature
range.
Features
5.5V Max Supply Input
Fixed or Adjustable V
OUT
1.0V to 4.2V
1A Output Current
Integrated Low On Resistance Power Switches
Synchronous Rectification
Up to 95% Efficiency
Power Good Signal
Internally Compensated Current Mode Control
High Initial Accuracy: 1%
850kHz Switching Frequency
Constant PWM Mode
Low Output Ripple With Light Load
Internal Soft Start
Current Limit Protection
Over-Temperature Protection
MSOP-8 Package
-40C to 85C Temperature Range
Applications
Cable/DSL Modems
Computer Peripherals
High Efficiency Conversion from 5V or 3.3V
Supply
Network Cards
Set-Top Boxes
Typical Application
OUTPUT
4.1
H
2x 22
F
10
F
0.1
F
100
LX
100k
V
P
INPUT
FB
AAT1152
ENABLE
POK
V
CC
P
GND
S
GND
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
2
1152.2005.01.1.3
Pin Descriptions
Pin Configuration
MSOP-8
1
2
POK
PGND
LX
V
P
FB
SGND
EN
V
CC
1
2
3
4
8
7
6
5
Pin #
Symbol
Function
1
FB
Feedback input pin.
2
SGND
Signal ground.
3
EN
Converter enable pin.
4
V
CC
Small signal filtered bias supply.
5
V
P
Input supply for converter power stage.
6
LX
Inductor connection pin.
7
POK
Power Good indicator. Open-drain output is low when V
OUT
falls
out of regulation.
8
PGND
Power ground return for output stage.
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
3
Absolute Maximum Ratings
T
A
= 25C, unless otherwise noted.
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
Note 1: Human body model is a 100pF capacitor discharged through a 1.5K resistor into each pin.
Thermal Characteristics
Note 2: Mounted on a demo board.
Recommended Operating Conditions
Symbol
Description
Rating
Units
T
Ambient Temperature Range
-40 to +85
C
Symbol
Description
Value
Units
JA
Maximum Thermal Resistance (MSOP-8)
2
150
C/W
P
D
Maximum Power Dissipation (MSOP-8)
2
833
mW
Symbol
Description
Value
Units
V
CC
, V
P
V
CC
, V
P
to GND
6
V
V
LX
LX to GND
-0.3 to V
P
+0.3
V
V
FB
FB to GND
-0.3 to V
CC
+0.3
V
V
EN
, V
POK
POK, EN to GND
-0.3 to 6
V
T
J
Operating Junction Temperature Range
-40 to 150
C
T
LEAD
Maximum Soldering Temperature (at leads, 10 sec)
300
C
V
ESD
ESD Rating
1
- HBM
3000
V
Electrical Characteristics
V
IN
= V
CC
= V
P
= 5V, T
A
= -40C to 85C, unless otherwise noted. Typical values are at T
A
= 25C.
Symbol
Description
Conditions
Min
Typ
Max
Units
V
IN
Operation Voltage
2.7
5.5
V
V
OUT
DC Output Voltage Tolerance
I
OUT
= 500mA
T
A
= 25C
-1.0
+1.0
%
Full Temp
-2.0
+2.0
I
LIM
Current Limit
T
A
= 25C
1.2
A
I
Q
Quiescent Supply Current
No Load, V
FB
= 0
160
300
A
V
OUT
(V
OUT
*
V
IN
) Load Regulation
V
IN
= 4.2V, I
LOAD
= 0 to 1A
3
%
V
OUT
/V
OUT
Line Regulation
V
IN
= 2.7V to 5.5V
0.2
%/V
F
OSC
Oscillator Frequency
T
A
= 25C
700
850
1000
kHz
R
DSON(H)
High-Side Switch On Resistance
T
A
= 25C
110
150
m
R
DSON(L)
Low-Side Switch On Resistance
T
A
= 25C
100
150
m
V
EN(H)
Enable Input High Voltage
V
IN
= 2.7V to 5.5V
1.4
V
V
EN(L)
Enable Input Low Voltage
V
IN
= 2.7V to 5.5V
0.6
V
I
EN
Enable Pin Leakage Current
V
EN
= 5.5V
1
A
V
UVLO
Under-Voltage Lockout
V
IN
Rising
2.5
V
V
IN
Falling
1.2
V
UVLO(hys)
Under-Voltage Lockout Hysteresis
250
mV
T
SD
Over-Temperature Shutdown
140
C
Threshold
T
HYS
Over-Temperature Shutdown
15
C
Hysteresis
I
SHDN
Shutdown Current
V
EN
= 0, V
IN
= 5.5V
1
A
V
TH(POK)
Power Good Threshold
V
FB
Ramping Up
90
% of
V
FB
Ramping Down
88
V
FB
R
POK
Power Good Pull-Down
4
On Resistance
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
4
1152.2005.01.1.3
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
5
Typical Characteristics
Oscillator Frequency Variation vs. Temperature
(V
IN
= 3.6V)
-10
-6
-2
2
6
10
-20
0
20
40
60
80
100
Temperature (
C)
Variation (%)
Oscillator Frequency Variation vs.
Supply Voltage
-1.5
-0.5
0.5
1.5
2.5
3.5
2.5
3
3.5
4
4.5
5
5.5
Supply Voltage (V)
Variation (%)
Enable Threshold vs. Input Voltage
0.7
0.8
0.9
1
1.1
1.2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Enable Threshold (V)
V
EN
(H)
V
EN
(L)
R
DS(ON)
vs. Input Voltage
80
90
100
110
120
130
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
R
DS(ON)
(m
)
High Side
Low Side
Low Side R
DS(ON)
vs. Temperature
70
90
110
130
150
170
-20
0
20
40
60
80
100
120
Temperature (
C)
R
DS(ON)
(m
)
2.7V
3.6V
4.2V
5.5V
High Side R
DS(ON)
vs. Temperature
70
90
110
130
150
170
-20
0
20
40
60
80
100
120
Temperature (
C)
R
DS(ON)
(m
)
2.7V
3.6V
4.2V
5.5V
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
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1152.2005.01.1.3
Typical Characteristics
Loop Gain and Phase vs. Output Capacitor
(V
IN
= 3.6V; I
OUT
= 0.3A; C
O
= 22
F)
-40
-32
-24
-16
-8
0
8
16
24
32
40
10
100
1000
Frequency (kHz)
Gain (dB)
-225
-180
-135
-90
-45
0
45
90
135
180
225
Phase (degrees)
Phase
Gain
4x
4x
3x
2x
3x
2x
Efficiency vs. Input Voltage
(V
OUT
= 1.5V)
50
60
70
80
90
100
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Efficiency (%)
I
O
= 1A
I
O
= 0.4A
Load Regulation
(V
OUT
= 3.3V; V
IN
= 5.0V)
-5
-4
-3
-2
-1
0
0
150
300
450
600
750
900
1050
Output Current (A)
V
OUT
Error (%)
Load Regulation
(V
OUT
= 1.5V; V
IN
= 3.6V)
-5
-4
-3
-2
-1
0
0
150
300
450
600
750
900
I
OUT
(mA)
Error (%)
Line Regulation
(V
OUT
= 1.5V)
-0.25
-0.15
-0.05
0.05
0.15
0.25
2.5
3
3.5
4
4.5
5.5
5
Input Voltage (V)
Accuracy (%)
I
OUT
= 0.4A
I
OUT
= 1.0A
Output Voltage vs. Temperature
(I
OUT
= 900mA; V
OUT
= 1.5V)
-1.0
-0.6
-0.2
0.2
0.6
1.0
-20
0
20
40
60
80
100
Temperature (
C)
Output Voltage Error (%)
V
IN
= 2.7V
V
IN
= 3.6V
Typical Characteristics
Output Ripple
(V
IN
= 3.6V; V
OUT
= 1.5V; I
OUT
= 1A)
500nsec/div
V
OUT
5mV/div
BW=20MHz
LX
2V/div
Output Ripple
(V
IN
= 3.6V; V
OUT
= 1.5V; I
OUT
= 0A)
500nsec/div
V
OUT
5mV/div
BW=20MHz
LX
2V/div
Transient Response
(V
IN
= 3.6V; V
OUT
= 1.5V; I
LOAD
= 0.25 to 1.2A)
20
s/div
V
OUT
50mV/div
Inductor Current
500mA/div
Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.5V; I
OUT
= 1.2A)
500nsec/div
V
(LX)
2V/div
I
L
500mA/div
Non-Switching I
Q
vs. Temperature
(F
B
= 0V; V
P
= V
CC
)
100
110
120
130
140
150
160
170
180
190
200
-20
-5
10
25
40
55
70
85
Temperature (
C)
Operating Current (
A)
V
CC
= 5.0V
V
CC
= 2.7V
V
CC
= 3.6V
V
CC
= 4.2V
V
CC
= 5.5V
No Load Input Current vs. Temperature
(V
CC
= V
P
)
0
2
4
6
8
10
12
-20
-5
10
25
40
55
70
85
Temperature (
C)
Input Current (mA)
V
CC
= 5.0V
V
CC
= 2.7V
V
CC
= 3.6V
V
CC
= 4.2V
V
CC
= 5.5V
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
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AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
8
1152.2005.01.1.3
Typical Characteristics
Output Ripple
(V
IN
= 5.0V; V
OUT
= 3.3V; I
OUT
= 1A)
500nsec/div
V
OUT
5mV/div
BW=20MHz
LX
2V/div
Output Ripple
(V
IN
= 5.0V; V
OUT
= 3.3V; I
OUT
= 0A)
500nsec/div
V
OUT
5mV/div
BW=20MHz
LX
2V/div
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
9
Functional Block Diagram
V
P
= 2.7V- 5.5V
V
CC
EN
POK
SGND
PGND
LOGIC
1.0V REF
Temp.
Sensing
Power
Good
OSC
OP. AMP
LX
FB
DH
DL
CMP
Applications Information
850kHz 1A DC-DC Synchronous Buck
Converter Control Loop
The AAT1152 is a peak current mode buck convert-
er. The inner, wide bandwidth loop controls the peak
current of the output inductor. The output inductor
current is sensed through the P-channel MOSFET
(high side) and is also used for short-circuit and
overload protection. A fixed slope compensation sig-
nal is added to the sensed current to maintain sta-
bility. The loop appears as a voltage-programmed
current source in parallel with the output capacitor.
The voltage error amplifier output programs the cur-
rent loop for the necessary inductor current to force
a constant output voltage for all load and line con-
ditions. The feedback resistive divider is internal,
dividing the output voltage to the error amplifier ref-
erence voltage of 1V. The error amplifier does not
have the large DC gain typical of most error ampli-
fiers. This eliminates the need for external compen-
sation components, while still providing sufficient
DC loop gain for load regulation. The crossover fre-
quency and phase margin are set by the output
capacitor value only.
Soft Start/Enable
Soft start increases the inductor current limit point in
discrete steps when the input voltage or enable
input is applied. It limits the current surge seen at
the input and eliminates output voltage overshoot
(see Figure 1). When pulled low, the enable input
forces the AAT1152 into a low-power, non-switching
state. The total input current during shutdown is
less than 1A.
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
10
1152.2005.01.1.3
Figure 1: Inrush Limit (V
IN
= 3.6V; V
OUT
= 1.5V; I
L
= 1A).
200
sec/div
V
OUT
1V/div
I
L
0.5A/div
Enable
2V/div
Figure 2: Current Limit Characteristics.
0
0.5
1
1.5
2
2.5
3
3.5
0
0.5
1
1.5
2
2.5
I
OUT
(A)
V
OUT
(V)
V
CC
=V
P
=3.6V
V
O
= 1.5V
V
CC
=V
P
= 5.0V
V
O
= 3.3V
Current Limit and Over-Temperature
Protection
For overload conditions, the peak input current is
limited. Figure 2 displays the current limit charac-
teristics. As load impedance decreases and the
output voltage falls closer to zero, more power is
dissipated internally, raising the device tempera-
ture. Thermal protection completely disables
switching when internal dissipation becomes
excessive, protecting the device from damage. The
junction over-temperature threshold is 140C with
15C of hysteresis.
Power and Signal Source
Separate small signal ground and power supply
pins isolate the internal control circuitry from the
noise associated with the output MOSFET switch-
ing. The low pass filter R1 and C3 (shown in
schematic Figures 3 and 4) filters the noise associ-
ated with power switching.
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
11
Power Good
The AAT1152 features an integrated Power Good
(POK) comparator and open-drain output signal.
The POK pin goes low when the converter output
is 12% or more below its nominal regulation volt-
age or when the device is in shutdown. Connect a
pull-up resistor from POK to the converter input or
output. Typical resistor pull-up values range from
100k to 10k.
Inductor
The output inductor is selected to limit the ripple
current to some predetermined value, typically
20% to 40% of the full load current at the maximum
input voltage. Manufacturer's specifications list
both the inductor DC current rating, which is a ther-
mal limitation, and the peak current rating, which is
determined by the saturation characteristics. The
inductor should not show any appreciable satura-
tion under normal load conditions. During overload
and short-circuit conditions, the average current in
the inductor can meet or exceed the I
LIMIT
point of
the AAT1152 without affecting converter perform-
ance. Some inductors may have sufficient peak
and average current ratings yet result in excessive
losses due to a high DCR. Always consider the
losses associated with the DCR and its effect on
the total converter efficiency when selecting an
inductor.
Figure 3: 3.3V to 1.25V Converter.
Figure 4: Lithium-Ion to 1.5V Output Converter.
1.5V Efficiency vs. I
OUT
0
20
40
60
80
100
10
100
1000
Iout (mA)
Efficiency (%)
2.7V
3.6V
4.2V
L1
4.1
H
C2, C4
2x 22
F
C1
10
F
R1 100
C3
0.1
F
C1 Murata 10
F 6.3V X5R GRM42-6X5R106K6.3
L1 Sumida CDRH5D 18-4R1
H
R2
100k
C2, C4 MuRata 22
F 6.3V GRM21BR60J226ME39L X5R 0805
Vo+ 1.5V 1A
Vin+ 2.7V-5.5V
V-
FB
Sgnd
EN
Vcc
Vp
LX
Pok
Pgnd
U1
AAT1152-1.5
R5
100k
LX
Pok
EN
L1
2.7
H
C2, C4
2x 22
F
C1
10
F
R1 100
C3
0.1
F
C1 Murata 10
F 6.3V X5R GRM42-6X 5R106K6.3
L1 Sumida CDRH4D28-2R 7
H
R2
100k
C2, C4 MuRata 22
F 6.3V GRM21BR60J226ME39L X5R 0805
Vo+ 1.25V 1A
Vin+ 3.3V
V-
FB
Sgnd
EN
Vcc
Vp
LX
Pok
Pgnd
U1
AAT1152-1.0
R5
100k
R3
2.55k 1%
R4
10k 1%
LX
Pok
EN
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
12
1152.2005.01.1.3
Figure 5: AAT1152 Layout
Figure 6: AAT1152 Layout
Top Layer.
Bottom Layer.
For a 1A load and the ripple set to 30% at the max-
imum input voltage, the maximum peak-to-peak
ripple current is 300mA. The inductance value
required is 3.9H.
The factor "k" is the fraction of full load selected for
the ripple current at the maximum input voltage.
The corresponding inductor RMS current is:
I is the peak-to-peak ripple current which is fixed by
the inductor selection above. For a peak-to-peak cur-
rent of 30% of the full load current, the peak current
at full load will be 115% of the full load. The 4.1H
inductor selected from the Sumida CDRH5D18
series has a 57m
DCR and a 1.95A DC current rat-
ing. At full load, the inductor DC loss is 57mW, which
amounts to a 3.8% loss in efficiency.
Input Capacitor
The primary function of the input capacitor is to pro-
vide a low impedance loop for the edges of pulsed
current drawn by the AAT1152. A low ESR/ESL
ceramic capacitor is ideal for this function. To mini-
mize the stray inductance, the capacitor should be
placed as closely as possible to the IC. This keeps
the high frequency content of the input current local-
ized, minimizing radiated and conducted EMI while
facilitating optimum performance of the AAT1152.
Ceramic X5R or X7R capacitors are ideal for this
function. The size required will vary depending on
the load, output voltage, and input voltage source
impedance characteristics. A typical value is around
10F. The input capacitor RMS current varies with
the input voltage and output voltage. The equation
for the RMS current in the input capacitor is:
The input capacitor RMS ripple current reaches a
maximum when V
IN
is two times the output voltage
where it is approximately one half of the load cur-
rent. Losses associated with the input ceramic
capacitor are typically minimal and are not an issue.
Proper placement of the input capacitor can be seen
in the reference design layout in Figures 5 and 6.
V
O
V
O
I
RMS
= I
O
1 -
V
IN
V
IN
I
RMS
I
O
I
I
O
=
+
=
2
2
12
1A
V
OUT
V
OUT
1.5
V
1.5V
L =
1 -
L = 3.9
H
L =
1 -
I
O
k
F
V
IN
1.0A
0.3
830kHz
4.2V
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
13
Output Capacitor
Since there are no external compensation compo-
nents, the output capacitor has a strong effect on
loop stability. Larger output capacitance will reduce
the crossover frequency with greater phase mar-
gin. For the 1.5V 1A design using the 4.1H induc-
tor, two 22F capacitors provide a stable output. In
addition to assisting stability, the output capacitor
limits the output ripple and provides holdup during
large load transitions. The output capacitor RMS
ripple current is given by:
For a ceramic capacitor, dissipation due to the
RMS current of the capacitor is not a concern.
Tantalum capacitors with sufficiently low ESR to
meet output voltage ripple requirements also have
an RMS current rating much greater than that
actually seen in this application.
Adjustable Output
For applications requiring an output other than
the fixed outputs available, the 1V version can be
programmed externally. Resistors R3 and R4 of
Figure 3 force the output to regulate higher than
1V. R4 should be 100 times less than the internal
1M
resistance of the FB pin. Once R4 is select-
ed, R3 can be calculated. For a 1.25V output with
R4 set to 10.0k
, R3 is 2.55k
.
Layout Considerations
Figures 5 and 6 display the suggested PCB layout
for the AAT1152. The most critical aspect of the
layout is the placement of the input capacitor C1.
For proper operation, C1 must be placed as close-
ly as possible to the AAT1152.
Thermal Calculations
There are two types of losses associated with the
AAT1152 output switching MOSFET: switching
losses and conduction losses. Conduction losses
are associated with the R
DS(ON)
characteristics of
the output switching device. At full load, assuming
continuous conduction mode (CCM), a simplified
form of the total losses is:
Once the total losses have been determined, the
junction temperature can be derived from the
JA
for the MSOP-8 package.
I
O
2
(
R
DSON(H)
V
O
+ R
DSON(L)
(
V
IN
- V
O
))
P
LOSS
=
V
IN
+ t
sw
F
I
O
V
IN
+ I
Q
V
IN
R3 = (V
O
- 1)
R4 = 0.25
10.0k
= 2.55k
V
OUT
(V
IN
- V
OUT
)
1
I
RMS
=
L
F
V
IN
2
3
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
14
1152.2005.01.1.3
Design Example:
Specifications
I
OUT
1A
I
RIPPLE
30% of full load at max V
IN
V
OUT
1.5V
V
IN
2.7V to 4.2V (3.6V nominal)
F
s
830kHz
Maximum Input Capacitor Ripple:
Inductor Selection:
Select Sumida Inductor CDRH5D18 4.1H 57m
2.0mm height.
Output Capacitor Dissipation:
I
RMS
V
OUT
(V
IN
- V
OUT
)
1.5V
(4.2V - 1.5V)
L
F
V
IN
4.1
H
830kHz
4.2V
=
=
= 82mA
RMS
1
2 3
1
2 3
P
ESR
= ESR
COUT
I
RMS
2
= 5m
0.082
2
A = 33
W
V
O
V
O
1.5
V
1.5V
I =
1 - =
1- = 280mA
L
F
V
IN
4.1
H
830kHz
4.2V
I
PK
= I
OUT
+
I
= 1A + 0.14A = 1.14A
2
P = I
O
2
DCR = 57mW
V
OUT
V
OUT
1.5
V
1.5V
L =
1 - =
1 - = 3.9
H
I
O
k
F
V
IN
1A
0.3
830kHz
4.2V
V
O
V
O
I
O
I
RMS
= I
O
1- =
= 0.5A
RMS
, V
IN
= 2
V
O
V
IN
V
IN
2
P = ESR
COUT
I
RMS
2
= 5m
0.5
2
A = 1.25mW
AAT1152 Dissipation:
Table 1: Surface Mount Inductors
Table 2: Surface Mount Capacitors
Manufacturer
Part Number
Value
Voltage
Temp. Co.
Case
MuRata
GRM40 X5R 106K 6.3
10F
6.3V
X5R
0805
MuRata
GRM42-6 X5R 106K 6.3
10F
6.3V
X5R
1206
MuRata
GRM21BR60J226ME39L
22F
6.3V
X5R
0805
MuRata
GRM21BR60J106ME39L
10F
6.3V
X5R
0805
Max DC
Size (mm)
Manufacturer
Part Number
Value
Current
DCR
L
W
H
Type
TaiyoYuden
NPO5DB4R7M
4.7H
1.4A
0.038 5.9
6.1
2.8
Shielded
Toko
A914BYW-3R5M-D52LC
3.5H
1.34A
0.073 5.0
5.0
2.0
Shielded
Sumida
CDRH5D28-4R2
4.2H
2.2A
0.031 5.7
5.7
3.0
Shielded
Sumida
CDRH5D18-4R1
4.1H
1.95A
0.057 5.7
5.7
2.0
Shielded
MuRata
LQH55DN4R7M03
4.7H
2.7A
0.041 5.0
5.0
4.7 Non-Shielded
MuRata
LQH66SN4R7M03
4.7H
2.2A
0.025 6.3
6.3
4.7
Shielded
T
J(MAX)
= T
AMB
+
JA
P
LOSS
= 85
C + 150
C/W 0.203W = 115
C
P
+ (t
sw
F I
O
+ I
Q
) V
IN
I
O
2
(R
DSON(H)
V
O
+ R
DSON(L)
(V
IN
-V
O
))
V
IN
=
=
+ (20nsec 830kHz 1.0A + 0.3mA) 3.6V = 0.203W
(0.14
1.5V + 0.145
(3.6V - 1.5V))
3.6V
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
1152.2005.01.1.3
15
Ordering Information
Note: Sample stock is held on part numbers listed in bold.
Note 1: XYY = assembly and date code.
Package Information
MSOP-8
All dimensions in millimeters.
PIN 1
1.95 BSC
0.254 BSC
0.155
0.075
0.60
0.20
3.00
0.10
0.95
0.15
0.95 REF
0.85
0.10
3.00
0.10
10
5
4
4
0.65 BSC
0.30
0.08
0.075
0.075
4.90
0.10
GAUGE PLANE
Output Voltage
Package
Marking
1
Part Number (Tape and Reel)
1.0V (Adj. V
OUT
1.0V)
MSOP-8
LTXYY
AAT1152IKS-1.0-T1
1.8V
MSOP-8
MLXYY
AAT1152IKS-1.8-T1
2.5V
MSOP-8
MMXYY
AAT1152IKS-2.5-T1
3.3V
MSOP-8
IAXYY
AAT1152IKS-3.3-T1
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
16
1152.2005.01.1.3
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
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rights, or other intellectual property rights are implied.
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supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
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other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
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