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PDF AAT2315 Data sheet ( Hoja de datos )
| Número de pieza | AAT2315 | |
| Descripción | Step-Down Converter | |
| Fabricantes | AAT | |
| Logotipo |  |
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AAT2513
Dual 600mA Step-Down
Converter with Synchronization
General Description
Features
SystemPower™
The AAT2513 is a high efficiency dual synchronous
step-down converter for applications where power
efficiency, thermal performance and solution size
are critical. Input voltage ranges from 2.7V to 5.5V,
making it ideal for systems powered by single-cell
lithium-ion/polymer batteries.
Each converter is capable of 600mA output current
and has its own enable pin. Efficiency of the con-
verters is optimized over full load range. Total no
load quiescent current is 60µA, allowing high effi-
ciency even under light load conditions.
The integrated power switches are controlled by
pulse width modulation (PWM) with a 1.7MHz typi-
cal switching frequency at full load, which minimizes
the size of external components. Fixed frequency,
low noise operation can be forced by a logic signal
on the MODE pin. Furthermore, an external clock
can be used to synchronize the switching frequency
of both converters.
• VIN Range: 2.7V to 5.5V
• Output Current:
— Channel 1: 600mA
— Channel 2: 600mA
• 96% Efficient Step-Down Converter
• Low No Load Quiescent Current
— 60µA Total for Both Converters
• Integrated Power Switches
• 100% Duty Cycle
• 1.7MHz Switching Frequency
• Optional Fixed Frequency or External SYNC
• Logic Selectable 180° Phase Shift Between
the Two Converters
• Current Limit Protection
• Automatic Soft-Start
• Over-Temperature Protection
• QFN33-16 Package
• -40°C to +85°C Temperature Range
A phase shift pin (PS) is available to operate the
two converters 180° out of phase at heavy load towww.DataSheet4U.com
Applications
achieve low input ripple.
• Cellular Phones / Smart Phones
The AAT2513 is available in a Pb-free, thermally
• Digital Cameras
enhanced 16-pin QFN33 package and is specified
• Handheld Instruments
for operation over the -40°C to +85°C temperature
• Micro Hard Disc Drives
range.
• Microprocessor / DSP Core / IO Power
• PDAs and Handheld Computers
Typical Application
Input:
2.7V to 5.5V
CIN
1μF
VIN1
VIN2
LX1
VCC
FB1
AAT2513
LX2
MODE/SYNC
PS
EN1
EN2
AGND
FB2
PGND1 PGND2
L1
VOUT1
2μH R1
L2
VOUT2
R2
2μH
R3
C1
4.7μF
R4
C2
4.7μF
2513.2007.04.1.1
1
1 page  
Electrical Characteristics
Efficiency vs. Load
(VOUT = 3.3V; L = 4.7µH; LL Mode)
100
90 VIN = 3.6V
80
VIN = 4.2V
70
60 VIN = 5.0V
50
40
30
0.1
1
10 100
Output Current (mA)
1000
Efficiency vs. Load
(VOUT = 2.5V; L = 3.3µH; LL Mode)
100
90 VIN = 2.7V
80
70 VIN = 3.6V
60 VIN = 4.2V
50 VIN = 5.0V
40
30
0.1
1
10 100
Output Current (mA)
1000
100
90
80
70
60
50
40
30
20
0.1
Efficiency vs. Load
(VOUT = 1.8V; L = 2.2µH; LL Mode)
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VIN = 5.0V
1 10 100
Output Current (mA)
1000
AAT2513
Dual 600mA Step-Down
Converter with Synchronization
DC Regulation
(VIN = 5.0V; VOUT = 3.3V; L = 4.7µH; LL Mode)
1.00
0.75
0.50
0.25
0.00
-0.25
-0.50
-0.75
-1.00
0.1
1
10 100
1000
Output Current (mA)
DC Regulation
(VIN = 3.3V to 5.5V; VOUT = 2.5V; L = 3.3µH; LL Mode)
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0.1
1
10 100 1000
Output Current (mA)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
DC Regulation
(VOUT = 1.8V; L = 2.2µH; LL Mode)
VIN = 4.2V
VIN = 5.0V
VIN = 3.3V
1 10 100
Output Current (mA)
1000
2513.2007.04.1.1
5
5 Page 
AAT2513
Dual 600mA Step-Down
Converter with Synchronization
VIN
C3
10μF
1.8V
L1
2.2uH
R1
118k
C1
4.7μF
R2
59.0k
U1
AAT2513
5
VIN1
16
VIN2
10
EN1
9
EN2
11
VCC
1
PS
7
LX1
14
LX2
4
FB1
3
FB2
6 12
N/C MODE/SYNC
2
AGND
15
N/C
8
PGND1
13
PGND2
L2
2.2μH
R3
187k
R4
59.0k
2.5V
C2
4.7μF
Figure 1: AAT2513 Typical Schematic.
Low Supply UVLO
Under-voltage lockout (UVLO) guarantees suffi-
cient VIN bias and proper operation of all internal
circuitry prior to activation.
Fault Protection
For overload conditions, the peak inductor current
is limited. Thermal protection disables the convert-
er when the internal dissipation or ambient temper-
ature becomes excessive. The over-temperature
threshold for the junction temperature is 140°C with
15°C of hysteresis.
PWM/LL Operation
For fixed frequency, with minimum ripple under
light load conditions, the MODE/SYNC pin should
be tied to a logic high. For more efficient operation
under light load conditions the MODE/SYNC pin
should be tied to a logic low level.
Clock Phase and Frequency
A logic high on the PS pin while in PWM mode
forces both converters to operate 180° out of phase
thus reducing the input ripple by roughly half. A
logic low on the PS pin synchronizes both convert-
ers in phase.
Applications Information
Inductor Selection
The step down converter uses peak current mode
control with slope compensation to maintain stability
for duty cycles greater than 50%. The output induc-
tor value must be selected so the inductor current
down slope meets the internal slope compensation
requirements. The internal slope compensation for
the adjustable and low voltage fixed versions of the
AAT2513 is 0.6A/µsec. This equates to a slope com-
pensation that is 75% of the inductor current down
slope for a 1.8V output and 2.2µH inductor.
m
=
0.75 ⋅
L
VO
=
0.75 ⋅ 1.8V
2.2µH
=
0.6
A
µsec
L=
0.75 ⋅ VO
m
=
0.75V ⋅ VO
0.6
A
µs
≈
1.2
µs
A
⋅ VO
µs
= 1.2 A 2.5V = 3.1µH
In this case a standard 3.3µH value is selected.
2513.2007.04.1.1
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AAT2315.PDF ] | |
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