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PDF AAT2153 Data sheet ( Hoja de datos )
| Número de pieza | AAT2153 | |
| Descripción | 2.5A Low Noise Step-Down Converter | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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SwitchRegTM
General Description
The AAT2153 SwitchReg is a 2.5A step-down converter
with an input voltage range of 2.7V to 5.5V and an
adjustable output voltage from 0.6V to VIN. The 1.4MHz
switching frequency enables the use of small external
components. The small footprint and high efficiency make
the AAT2153 an ideal choice for portable applications.
The AAT2153 delivers 2.5A maximum output current
while consuming only 42μA of no-load quiescent current.
Ultra-low RDS(ON) integrated MOSFETs and 100% duty
cycle operation make the AAT2153 an ideal choice for
high output voltage, high current applications which
require a low dropout threshold.
The AAT2153 provides excellent transient response and
high output accuracy across the operating range. No
external compensation components are required.
The AAT2153 maintains high efficiency throughout the
load range. The AAT2153’s unique architecture produces
reduced ripple and spectral noise. Over-temperature and
short-circuit protection safeguard the AAT2153 and sys-
tem components from damage.
The AAT2153 is available in a Pb-free, space-saving
16-pin 3x3mm QFN package. The product is rated over
an operating temperature range of -40°C to +85°C.
PRODUCT DATASHEET
AAT2153
2.5A Low Noise Step-Down Converter
Features
• 2.5A Maximum Output Current
• Input Voltage: 2.7V to 5.5V
• Output Voltage: 0.6V to VIN
• Up to 95% Efficiency
• Low Noise Light Load Mode
• 42μA No Load Quiescent Current
• No External Compensation Required
• 1.4MHz Switching Frequency
• 100% Duty Cycle Low-Dropout Operation
• Internal Soft Start
• Over-Temperature and Current Limit Protection
• <1μA Shutdown Current
• 16-Pin 3x3mm QFN Package
• Temperature Range: -40°C to +85°C
Applications
• Cellular Phones
• Digital Cameras
• Hard Disk Drives
• MP3 Players
• PDAs and Handheld Computers
• Portable Media Players
• USB Devices
Typical Application
3.3V
C1
10µF
www.DataSheet4U.com
U1
AAT2153
12 VP
FB 4
11 VP
LX 15
10 VP
LX 14
7 EN
LX 13
9 VCC
N/C 16
6 N/C PGND 3
8 N/C PGND 2
5 SGND PGND 1
L1
2.2µH
2.5V
R3
187k
R4
59k
C3
22µF
2153.2008.09.1.0
www.analogictech.com
1
1 page  
SwitchRegTM
Typical Characteristics
Efficiency vs. Output Current
(VOUT = 3.3V)
100
90
80
70
60
50
40
30
20
VIN = 5.0V
VIN = 4.5V
10 VIN = 4.2V
0
0
1
10
100
1000
10000
Output Current (mA)
Efficiency vs. Output Current
(VOUT = 1.8V)
100
90
80
70
60
50
40
30
20
10
0
0
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
1
10
100
1000
10000
Output Current (mA)
Efficiency vs. Output Current
(VOUT = 1.2V)
100
90
80
70
60
50
40
30
www.D20ataSheet4U.com
10
0
01
10
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
100
1000
10000
Output Current (mA)
PRODUCT DATASHEET
AAT2153
2.5A Low Noise Step-Down Converter
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
Load Regulation
(VOUT = 3.3V)
VIN = 5.0V
VIN = 4.5V
VIN = 4.2V
1 10 100 1000
Output Current (mA)
10000
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
Load Regulation
(VOUT = 1.8V)
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
1 10 100 1000
Output Current (mA)
10000
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
0.1
Load Regulation
(VOUT = 1.2)
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
1 10 100 1000
Output Current (mA)
10000
2153.2008.09.1.0
www.analogictech.com
5
5 Page 
SwitchRegTM
PRODUCT DATASHEET
AAT2153
2.5A Low Noise Step-Down Converter
junction over-temperature threshold is 140°C with 15°C
of hysteresis. Once an over-temperature or over-current
fault condition is removed, the output voltage automati-
cally recovers.
Peak current mode control and optimized internal com-
pensation provide high loop bandwidth and excellent
response to input voltage and fast load transient events.
Soft start eliminates output voltage overshoot when the
enable or the input voltage is applied. Under-voltage
lockout prevents spurious start-up events.
Control Loop
The AAT2153 is a peak current mode step-down con-
verter. The current through the P-channel MOSFET (high
side) is sensed for current loop control, as well as short-
circuit and overload protection. A fixed slope compensa-
tion signal is added to the sensed current to maintain
stability for duty cycles greater than 50%. The peak cur-
rent mode loop appears as a voltage-programmed cur-
rent source in parallel with the output capacitor.
The output of the voltage error amplifier programs the
current mode loop for the necessary peak switch current
to force a constant output voltage for all load and line
conditions. Internal loop compensation terminates the
transconductance voltage error amplifier output. The
reference voltage is internally set to program the con-
verter output voltage greater than or equal to 0.6V.
Soft Start/Enable
Soft start limits the current surge seen at the input and
eliminates output voltage overshoot. When pulled low,
the enable input forces the AAT2153 into a low-power,
non-switching state. The total input current during shut-
down is less than 1μA.
Current Limit and
Over-Temperature Protection
For overload conditions, the peak input current is limit-
ed. To minimize power dissipation and stresses under
current limit and short-circuit conditions, switching is
terminated after entering current limit for a series of
pulses. Switching is terminated for seven consecutive
clock cycles after a current limit has been sensed for a
series of four consecutive clock cycles.
Thermal protection completely disables switching when
internal dissipation becomes excessive. The junction
over-temperature threshold is 140°C with 15°C of hys-
teresis. Once an over-temperature or over-current fault
conditions is removed, the output voltage automatically
recovers.
Under-Voltage Lockout
Internal bias of all circuits is controlled via the VCC
input. Under-voltage lockout (UVLO) guarantees suffi-
cient VIN bias and proper operation of all internal cir-
cuitry prior to activation.
VIN+
C1
10μF
www.DataSheet4U.GcoNmD
Enable
R1
0
R2
100K
C2
0.1μF
U1
AAT2153
12
VP
4
FB
11
VP
15
LX
10
VP
14
LX
7
EN
13
LX
9
VCC
16
N/C
63
N/C PGND
82
N/C PGND
51
SGND PGND
LX
L1
3.0μH
R4
59.0k
C8
VOUT+
R3 VOUT(V) R3 (kΩ)
0.8 19.6
0.9 29.4
1.0 39.2
1.1 49.9
1.2 59.0
1.3 68.1
1.4 78.7
1.5 88.7
1.8 118
C3
2x22μF
2.0
2.5
3.3
137
187
267
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
GND
C3 Murata 22μF 6.3V GRM21BR60J226ME39L X5R 0805
L1 see Table 2
R1 and C2 are an optional noise filter for internal VCC.
R6, C4, C5-C7 are not populated
C8 100pF to 1nF feed-forward capacitor for enhanced transient response
Figure 1: AAT2153 Evaluation Schematic.
2153.2008.09.1.0
www.analogictech.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AAT2153.PDF ] | |
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