Analogic AAT1152IKS-2.0-T1 850khz 1a synchronous buck dc/dc converter Datasheet

AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Features
The AAT1152 SwitchReg™ is a member of
AnalogicTech™'s Total Power Management™ IC
product family. The Step-down switching 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 efficiency using synchronous rectification. Fully internally compensated, the AAT1152 simplifies system design and lowers external part count.
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The AAT1152 features a Power Good (POK) function which monitors the output, alerting the system
if the output voltage falls out of regulation.
The AAT1152 is available in MSOP-8 package,
rated over -40 to 85°C.
SwitchReg™
5.5V max supply input
Fixed output voltage: 1.1V–4.2V with 100 mV
increment
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 softstart
Current limit protection
Over-Temperature protection
MSOP-8 package
Applications
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Computer Peripherals
Set Top Boxes
Network Cards
Cable/DSL Modems
High efficiency conversion from 5V or 3.3V
supply
Typical Application
INPUT
100k
VP
10µF
AAT1152
FB
POK
4.1µH
LX
ENABLE
100Ω
VCC
OUTPUT
SGND
PGND
47µF
0.1µF
1152.2003.01.0.9
1
Preliminary Information
General Description
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Pin Descriptions
Pin #
Symbol
Function
1
FB
2
SGND
3
EN
Converter enable pin
4
VCC
Small Signal Filtered Bias Supply
5
VP
Input supply for converter power stage
6
LX
Inductor connection pin
7
POK
8
PGND
Feedback input pin
Signal Ground
Power Good indicator. Open-drain output is low when VOUT falls
out of regulation.
Power ground return for output stage
Pin Configuration
MSOP-8
2
8
7
2
2
1
1
FB
SGND
EN
VCC
3
6
4
5
PGND
POK
LX
VP
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Absolute Maximum Ratings
(TA=25°C unless otherwise noted)
Symbol
Description
VCC, VP
VLX
VFB
VEN, VPOK
TJ
TLEAD
VESD
VCC, VP to GND
LX to GND
FB to GND
POK, EN to GND
Operating Junction Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
ESD Rating 1 - HBM
Value
Units
6
-0.3 to VP+0.3
-0.3 to VCC+0.3
-0.3 to 6
-40 to 150
300
3000
V
V
V
V
°C
°C
V
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions 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
Symbol
ΘJA
PD
Description
Maximum Thermal Resistance (MSOP-8)
Maximum Power Dissipation (MSOP-8) 2
2
Value
Units
150
833
°C/W
mW
Rating
Units
-40 to +85
°C
Note 2: Mounted on a demo board.
Recommended Operating Conditions
Symbol
T
1152.2003.01.0.9
Description
Ambient Temperature Range
3
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Electrical Characteristics
(VIN = VCC = VP = 5V, TA= -40 to 85°C unless otherwise noted. Typical
values are at TA = 25°C)
Symbol
VIN
VOUT
ILIM
IQ
∆VOUT (VOUT*∆VIN)
∆VOUT/VOUT
FOSC
RDSON(H)
RDSON(L)
VEN(H)
VEN(L)
IEN
VUVLO
VUVLO(hys)
TSD
THYS
ISHDN
4
Description
Conditions
Min
Operation Voltage
TA = 25°C
Full temp
DC Output Voltage Tolerance
IOUT = 500mA
Current Limit
Quiescent Supply Current
Load Regulation
Line Regulation
Oscillator frequency
High-side Switch On-resistance
Low-side Switch On-resistance
Enable input high voltage
Enable input low voltage
Enable Pin Leakage Current
TA = 25°C
No load, VFB = 0
VIN = 4.2V, ILOAD = 0 to 1A
VIN = 2.7 to 5.5V
TA = 25°C
TA = 25°C
TA = 25°C
VIN = 2.7 to 5.5V
VIN = 2.7 to 5.5V
VEN = 5.5V
VIN rising
VIN falling
Undervoltage Lockout
Undervoltage Lockout Hysteresis
Over Temp Shutdown Threshold
Over Temp Shutdown Hysteresis
Shutdown current
VTH(POK)
Power Good Threshold
RPOK
Power Good Pull-Down
On-Resistance
Typ
2.7
-1.0
-2.0
1.2
700
160
3
0.2
850
110
100
Max
Units
5.5
+1.0
+2.0
V
300
1000
150
150
1.4
0.6
1
2.5
1.2
250
140
15
VEN = 0, VIN = 5.5V
VFB Ramping Up
VFB Ramping Down
1
90
88
4
%
A
µA
%
%/V
kHz
mΩ
mΩ
V
V
µA
V
mV
°C
°C
µA
% of
VFB
Ω
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Typical Characteristics
High Side RDS(ON) vs. Temperature
Low Side RDS(ON) vs. Temperature
170
170
3.6V
150
150
RDS(ON) (mΩ)
RDS(ON) (mΩ)
2.7V
130
110
70
-20
5.5V
4.2V
90
0
20
40
130
3.6V
2.7V
110
5.5V
90
60
80
100
4.2V
70
-20
120
0
20
40
60
80
100
120
Temperature (°C)
Temperature (°C)
Enable Threshold vs. Input Voltage
RDS(ON) vs. Input Voltage
130
1.2
120
Enable Threshold (V)
RDS(ON) (mΩ)
High Side
110
100
Low Side
90
80
2.5
3
3.5
4
4.5
5
5.5
1.1
VEN(H)
1
0.9
VEN(L)
0.8
0.7
2.5
Input Voltage (V)
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Oscillator Frequency Variation vs. Temperature
VIN=3.6V
3.5
10
2.5
6
Variation (%)
Variation (%)
Oscillator Frequency Variation vs.
Supply Voltage
1.5
0.5
-0.5
2
-2
-6
-1.5
2.5
3
3.5
4
4.5
Supply Voltage (V)
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5
5.5
-10
-20
0
20
40
60
80
100
Temperature (°C)
5
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Typical Characteristics
Line Regulation
VOUT=1.5V
1.0
0.25
0.6
0.15
VIN = 2.7V
0.2
-0.2
IOUT = 1.0A
Accuracy (%)
Output Voltage Error (%)
Output Voltage vs. Temperature
IOUT=900mA, VOUT=1.5V
VIN = 3.6V
0.05
-0.15
-0.6
-1.0
-20
IOUT = 0.4A
-0.05
-0.25
0
20
40
60
80
2.5
100
3
3.5
4.5
5
5.5
Input Voltage (V)
Temperature (°C)
Load Regulation
VOUT=3.3V, VIN=5.0V
Load Regulation
VOUT= 1.5V, VIN=3.6V
0
0
-1
-1
VOUT Error (%)
Error (%)
4
-2
-3
-2
-3
-4
-4
-5
-5
0
0
150
300
450
600
750
900
Efficiency vs. Input Voltage
VOUT=1.5V
450
600
IO = 1A
Gain (dB)
70
225
32
180
16
100µF
8
Phase
47µF
0
47µF
-16
Gain
69µF
100µF
-32
-40
50
3.5
4
Input Voltage (V)
4.5
5
5.5
10
100
135
90
45
69µF
-8
-24
60
3
1050
0
-45
-90
-135
Phase (degrees)
IO = 0.4A
2.5
900
40
24
90
80
750
Loop Gain and Phase vs. Output Capacitor
VIN = 3.6V IOUT = 0.3A
100
Efficiency (%)
300
Output Current (A)
IOUT (mA)
6
150
-180
-225
1000
Frequency (kHz)
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Typical Characteristics
No Load Input Current vs. Temperature
VCC = VP
VCC = 5.5V
VCC = 5.0V
Operating Current (µA)
Input Current (mA)
12
Non-Switching IQ vs. Temperature
FB = 0V, VP = VCC
10
8
6
VCC = 4.2V
4
VCC = 3.6V
VCC = 2.7V
2
0
-20
-5
10
25
40
55
70
85
200
190
180
VCC = 5.5V
VCC = 5.0V
170
160
150
140
130
VCC = 4.2V
VCC = 2.7V
120
110
100
-20
-5
10
25
VCC = 3.6V
40
55
70
85
Temperature (°C)
Temperature (°C)
Switching Waveform
Transient Response
VOUT
50mV/div
V(LX)
2V/div
Inductor Current
500mA/div
IL
500mA/div
VIN=3.6V
VOUT=1.5V
IOUT=1.2A
VIN=3.6V
VOUT=1.5V
ILOAD=0.25 to 1.2A
500nsec/div
20µs/div
Output Ripple
1.5V, No Load
Output Ripple
1.5V, 1A Load
VOUT
5mV/div
BW=20MHz
VOUT
5mV/div
BW=20MHz
VIN=3.6V
VOUT=1.5V
IOUT=0A
VIN=3.6V
VOUT=1.5V
IOUT=1A
LX
2V/div
LX
2V/div
500nsec/div
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500nsec/div
7
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Typical Characteristics
Output Ripple
3.3V, No Load
VOUT
5mV/div
BW=20MHz
VOUT
5mV/div
BW=20MHz
VIN=5.0V
VOUT=3.3V
IOUT=0A
VIN=5.0V
VOUT=3.3V
IOUT=1A
LX
2V/div
LX
2V/div
500nsec/div
8
Output Ripple
3.3V, 1A Load
500nsec/div
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Functional Block Diagram
VCC
VP= 2.7V- 5.5V
1.0V REF
FB
OP. AMP
CMP
DH
LOGIC
LX
OSC
DL
Temp.
Sensing
Power
Good
SGND
POK
Applications Information
850 kHz 1 Amp DC-DC Synchronous
Buck Converter
Control Loop
The AAT1152 is a peak current mode buck converter. 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 signal is added to the sensed current to
maintain stability. The loop appears as a voltage
programmed current source in parallel with the output capacitor.
The voltage error amplifier output programs the
current loop for the necessary inductor current to
1152.2003.01.0.9
EN
PGND
force a constant output voltage for all load and line
conditions. The feedback resistive divider is internal, dividing the output voltage to the error amplifier reference voltage of 1.0V. The error amplifier
does not have a large DC gain typical of most error
amplifiers. This eliminates the need for external
compensation components while still providing sufficient DC loop gain for load regulation. The
crossover frequency 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.
The enable input, when pulled low, forces the
AAT1152 into a low power non-switching state. The
total input current during shutdown is less that 1µA.
9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Enable
2V/div
VOUT
1V/div
IL
0.5A/div
VIN=3.6V
VOUT=1.5V
IL=1A
200µsec/div
Figure 1: Inrush Limit
Power and Signal Source
Current Limit and Over-temperature
protection
Separate small signal ground and power supply
pins isolate the internal control circuitry from the
noise associated with the output MOSFET switching. The low pass filter R1 and C3 in schematic figures 3 and 4 filters the noise associated with the
power switching.
For overload conditions the peak input current is
limited. Figure 2 displays the VI current limit characteristics. As load impedance decreases and the
output voltage falls closer to zero, more power is
dissipated internally, raising the device temperature. Thermal protection completely disables
switching when internal dissipation becomes
excessive, protecting the device from damage. The
junction over-temperature threshold is 140°C with
15°C of hysteresis.
Current Limit Characteristic
3.5
VCC =VP = 5.0V
VO = 3.3V
Figure 4 schematic
3
VOUT (V)
2.5
2
1.5
VCC =VP =3.6V
VO = 1.5V
Figure 3 schematic
1
0.5
0
0
0.5
1
1.5
2
2.5
IOUT (A)
Figure 2.
10
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Power Good
The AAT 1152 features an integrated Power Good
(POK) comparator and open-drain output signal.
The POK pin goes low when the converter’s output
is 12% or more below its nominal regulation voltage or when the device is in shutdown. Connect a
pull-up resistor from POK to the converter’s 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 2040% of the full load current at the maximum input
voltage. Manufacturer's specifications list both the
inductor DC current rating, which is a thermal limitation, and the peak current rating, which is determined by the saturation characteristics. The inductor should not show any appreciable saturation
under all normal load conditions. During over load
and short circuit conditions, the average current in
the inductor can meet or exceed the ILIMIT point of
the AAT1152 without effecting the converter performance. 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.
For a 1 Amp load and the ripple set to 30% at the
maximum input voltage, the maximum peak to
peak ripple current is 300 mA. The inductance
value required is 3.9µH.
L=
 V 
VOUT
⋅ 1 - OUT
IO ⋅ k ⋅ F 
VIN 
L=
1.5V
 1.5V 
⋅11.0A ⋅ 0.3 ⋅ 830kHz  4.2V
L = 3.9µH
1152.2003.01.0.9
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:
IRMS =
 2 ∆I2
≈ Io = 1.0A
I +
o
12
∆I is the peak to peak ripple current which is fixed by
the inductor selection above. For a peak to peak current of 30% of the full load current the peak current
at full load will be 115% of the full load. The 4.1µH
inductor selected from the Sumida CDRH5D18
series has a 57 mΩ DCR and a 1.95 Amp DC current rating. 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 provide 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 minimize the stray inductance the capacitor should be
placed as close as possible to the IC. This keeps
the high frequency content of the input current
localized, 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 10µF. The input capacitor RMS
current varies with the input voltage and the output
voltage. The equation for the maximum RMS current in the input capacitor is:
IRMS = IO ⋅
VO 
VO 
⋅ 1VIN 
VIN 
The input capacitor RMS ripple current reaches a
maximum when VIN is two times the output voltage
where it is approximately one half of the load current. Losses associated with the input ceramic
capacitor are typically minimal and not an issue. The
proper placement of the input capacitor can be seen
in the reference design layout in figures 5 and 6.
11
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
R5
100k
U1
AAT1152-1.0
Vin+ 3.3V
R1 100
R2
C1
10µF
Pok
100k
C3
0.1µF
EN
Vp
FB
Vcc
Pok
EN
LX
Sgnd Pgnd
R3
2.55k 1% Vo+ 1.25V1A
R4
10k 1%
LX
L1
2.7µH
C2
100µF
VC1 Murata 10µF 6.3V X5R GRM42-6X 5R106K6.3
C2 MuRata 100µF 6.3V GRM43-2 X5R 107M 100µF 6.3V
L1 Sumida CDRH4D28-2R 7µH
Figure 3: 3.3V to 1.25V converter
Output Capacitor
Since there are no external compensation components, the output capacitor has a strong effect on
loop stability. Larger output capacitance will reduce
the crossover frequency with greater phase margin. For the 1.5V 1A design using the 4.1 µH inductor, a 47µF capacitor provides a stable loop with 35
degrees of phase margin at a crossover frequency
of 100 kHz. Doubling the capacitance to 100µF
reduces the crossover frequency to half while
increasing the phase margin to 60 degrees. In
addition to assisting stability, the output capacitor
limits the output ripple and provides holdup during
large load transitions. A 100µF X5R or X7R ceramic capacitor provides sufficient bulk capacitance to
12
stabilize the output during large load transitions
and has ESR and ESL characteristics necessary
for low output ripple. The output capacitor rms ripple current is given by:
IRMS =
1
2⋅
3
⋅
(VOUT + VFWD) ⋅ (VIN - VOUT)
L ⋅ F ⋅ VIN
For a ceramic capacitor the 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.
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
R5
100k
U1
AAT1152-1.5
Vin+ 2.7V-5.5V
R1 100
EN
R2
100k
C1
10µF
Pok
Vp
FB
Vcc
Pok
EN
LX
L1
4.1µH
LX
Sgnd Pgnd
C3
0.1µF
Vo+ 1.5V 1A
C2
100µF
VC1 Murata 10µF 6.3V X5R GRM42-6X5R106K6.3
C2 MuRata 100µF 6.3V GRM43-2 X5R 107M 100µF 6.3V
L1 Sumida CDRH5D 18-4R 1µH
1.5V Efficiency vs. IOUT
100
2.7V
Efficiency (%)
80
60
4.2V
40
3.6V
20
0
10
100
1000
Iout (mA)
Figure 4: Lithium-Ion to 1.5V Output Converter
Figure 5: AAT1152 Layout
Top Layer
1152.2003.01.0.9
Figure 6: AAT1152 Layout
Bottom Layer
13
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Adjustable Output
Layout Considerations
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 1 Volt.
R4 should be 100 times less than the internal 1
MegOhm resistance of the FB pin. Once R4 is
selected R3 can be calculated. For a 1.25V output
with R4 set to 10.0k, R3 is 2.55kΩ.
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 as
possible to the AAT1152.
R3 = (VO - 1) ⋅ R4 = 0.25 ⋅ 10.0kΩ = 2.55kΩ
PLOSS =
Thermal Calculations
There are two types of losses associated with the
AAT1152 output switching MOSFET, switching
losses and conduction losses. The conduction
losses are associated with the Rds(on) characteristics of the output switching device. At full load,
assuming continuous conduction mode (CCM), a
simplified form of the total losses is:
IO2 ⋅ (RDSON(H) ⋅ VO + RDSON(L) ⋅ (VIN - VO))
+ tsw ⋅ F ⋅ IO ⋅ VIN + IQ ⋅ VIN
VIN
Once the total losses have been determined the junction temperature can be derived from the ΘJA for the
MSOP-8 package.
Design Example
Specifications
IOUT = 1.0A
IRIPPLE = 30% of full load at max VIN
VOUT = 1.5V
VIN = 2.7 - 4.2 V (3.6V nominal)
Fs = 830 kHz
Maximum Input Capacitor Ripple:
IRMS = IO ⋅
VO

VO  IO
⋅ 1= = 0.5ARMS
VINMAX  VINMAX 
2
P = ESRCOUT ⋅ IRMS2 = 5mΩ ⋅ 0.52 A = 1.25mW
14
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Inductor Selection:
L=
 V 
VOUT
1.5V
 1.5V 
⋅ 1 - OUT =
⋅1= 3.9µH
IO ⋅ k ⋅ F 
VIN  1.0A ⋅ 0.3 ⋅ 830kHz  4.2V 
Select Sumida inductor CDRH5D18 4.1µH 57mΩ 2.0 mm height.
∆I =
 1.5V
VO 
V 
1.5V
⋅ 1- O =
⋅ 1= 280mA
L ⋅ F  VIN  4.1µH ⋅ 830kHz  4.2V
IPK = IOUT +
∆I
= 1.0A + 0.14A = 1.14A
2
P = IO2 ⋅ DCR =57mW
Output Capacitor Dissipation:
IRMS =
VOUT ⋅ (VIN - VOUT)
1.5V ⋅ (4.2V - 1.5V)
1
1
⋅
⋅
=
=82mARMS
L ⋅ F ⋅ VIN
2⋅ 3
2 ⋅ 3 4.1µH ⋅ 830kHz ⋅ 4.2V
PESR = ESRCOUT ⋅ IRMS2 = 5mΩ ⋅ .0822 A = 33µW
AAT1152 Dissipation:
P=
=
IO2 · (RDSON(H) · VO + RDSON(L) · (VIN -VO))
VIN
(0.14Ω · 1.5V + 0.145Ω · (3.6V - 1.5V))
3.6V
+ (tsw · F · IO + IQ) · VIN
+ (20nsec · 830kHz · 1.0A + 0.3mA) · 3.6V = 0.203W
TJ(MAX) = TAMB + ΘJA · PLOSS = 85°C + 150°C/W · 0.203W = 115°C
1152.2003.01.0.9
15
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Table 1: Surface Mount Inductors
Manufacturer
Part Number
Value
Max DC
Current
DCR
TaiyoYuden
Toko
Sumida
Sumida
MuRata
MuRata
NPO5DB4R7M
A914BYW-3R5M-D52LC
CDRH5D28-4R2
CDRH5D18-4R1
LQH55DN4R7M03
LQH66SN4R7M03
4.7µH
3.5µH
4.2µH
4.1µH
4.7µH
4.7µH
1.4A
1.34A
2.2A
1.95A
2.7A
2.2A
.038
.073
.031
.057
.041
.025
Size (mm)
L×W×H
5.9 × 6.1 × 2.8
5.0 × 5.0 × 2.0
5.7 × 5.7 × 3.0
5.7 × 5.7 × 2.0
5.0 × 5.0 × 4.7
6.3 × 6.3 × 4.7
Type
Shielded
Shielded
Shielded
Shielded
Non-shielded
Shielded
Table 2: Surface Mount Capacitors
16
Manufacturer
Part Number
Value
Voltage
Temp. Co.
Case
TDK
MuRata
MuRata
MuRata
MuRata
C4532X5ROJ107M
GRM43-2 X5R 107M 6.3
GRM43-2 X5R 476K 6.3
GRM40 X5R 106K 6.3
GRM42-6 X5R 106K 6.3
100µF
100µF
47µF
10µF
10µF
6.3V
6.3V
6.3V
6.3V
6.3V
X5R
X5R
X5R
X5R
X5R
1812
1812
1812
0805
1206
1152.2003.01.0.9
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
Ordering Information
Output Voltage
Package
Marking
Part Number (Tape and Reel)
1.0V
MSOP-8
AAT1152IKS-1.0-T1
1.1V
MSOP-8
AAT1152IKS-1.1-T1
1.2V
MSOP-8
AAT1152IKS-1.2-T1
1.5V
MSOP-8
AAT1152IKS-1.5-T1
1.8V
MSOP-8
AAT1152IKS-1.8-T1
2.0V
MSOP-8
AAT1152IKS-2.0-T1
2.5V
MSOP-8
AAT1152IKS-2.5-T1
3.0V
MSOP-8
AAT1152IKS-3.0-T1
3.3V
MSOP-8
AAT1152IKS-3.3-T1
Package Information
MSOP-8
4° ± 4°
4.90 ± 0.10
3.00 ± 0.10
1.95 BSC
0.95 REF
0.60 ± 0.20
PIN 1
3.00 ± 0.10
0.85 ± 0.10
0.95 ± 0.15
10° ± 5°
GAUGE PLANE
0.254 BSC
0.155 ± 0.075
0.075 ± 0.075
0.65 BSC
0.30 ± 0.08
All dimensions in millimeters.
1152.2003.01.0.9
17
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work
rights, or other intellectual property rights are implied.
AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice, and advise customers to obtain the latest
version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
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
performed.
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830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
18
1152.2003.01.0.9
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