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PDF AAT1217 Data sheet ( Hoja de datos )
| Número de pieza | AAT1217 | |
| Descripción | Micropower Synchronous Step-Up Converter | |
| Fabricantes | Advanced Analogic Technologies | |
| Logotipo |  |
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General Description
The AAT1217 a high efficiency, synchronous, fixed
frequency, step-up converter designed for single-
cell or dual-cell alkaline, NiMH, or NiCd battery-
powered applications. The high 1.2MHz switching
frequency and completely integrated control cir-
cuitry minimize the total solution footprint area
while maintaining excellent regulation, ripple, and
transient response throughout the full load range.
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Pulse skipping mode operation and low quiescent
current allow the AAT1217 to maintain high effi-
ciency performance for light load and sleep mode
conditions. With a 1.2A peak switch current limit,
the AAT1217 is capable of delivering 100mA to the
load from a single AA cell or up to 400mA from dual
AA cells. The AAT1217 has a 0.85V start-up volt-
age with operation down to 0.5V.
The AAT1217 is available in a Pb-free, space-sav-
ing low profile (1mm) 6-pin TSOT23 package and
is rated over the -40°C to +85°C ambient tempera-
ture range.
AAT1217
600mA, 1.2MHz, Micropower
Synchronous Step-Up Converter
Features
SwitchReg™
• VIN Operation Range: 0.5V to VOUT
• VOUT Range: 2.5V to 5.5V
• 100mA Output from a Single AA Cell Input
• 400mA Output from a Dual AA Cell Input
• High Efficiency: Up to 93% Efficiency
• Low Start-Up Voltage: 0.85V Typical
• Internal Synchronous Rectifier
— VOUT ≤ 4.5V: No External Schottky Diode
• Fixed Frequency Pulse Width Modulation
(PWM) Current-Mode Control Scheme with
Internal Compensation
• 1.2MHz Fixed Switching Frequency
• 1.2A Current Limit
• Light Load Pulse Skipping Mode Operation
• Low 80µA No Load Input Current
• Over-Current Protection
• EMI Reduction Anti-Ringing Control Circuitry
• Low Shutdown Current: <1.0µA
• -40°C to +85°C Ambient Temperature Range
• Low Profile (1mm) TSOT23-6 Package
Applications
• Cellular and Smart Phones
• Digital Still and Video Cameras
• Microprocessors and DSP Core Supplies
• MP3 Player
• Portable Instruments
• Wireless and DSL Modems
Typical Application
L1
4.7µH
VIN: 0.85V
CIN
4.7µF
R3
1MΩ
SW
VIN VOUT
AAT1217-1.2
SHDN
GND
FB
VOUT:
3.3V,100 mA
R1
1.02MΩ
COUT
4.7µF
R2
604kΩ
L1
4.7µH
VIN: 0.85V
CIN
4.7µF
R3
1MΩ
SW
VIN VOUT
AAT1217-3.3
SHDN
GND
FB
VOUT:
3.3V,100 mA
COUT
4.7µF
1217.2007.07.1.0
1
1 page  
Typical Characteristics
100
90
80
70
60
50
40
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20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 3.3V; TA = 25°C)
VIN = 2.4V
VIN = 1.5V
VIN = 1.2V
1 10 100
Output Current (mA)
1000
AAT1217
600mA, 1.2MHz, Micropower
Synchronous Step-Up Converter
100
90
80
70
60
50
40
30
20
10
0
0.1
Efficiency vs. Output Current
(VOUT = 5V; TA = 25°C)
VIN = 2.4V
VIN = 3.6V
VIN = 1.2V
VIN = 1.5V
1 10 100
Output Current (mA)
1000
Output Voltage vs. Output Current
(VOUT = 3.3V; TA = 25°C)
3.5
3.4
VIN = 1.2V
3.3
VIN = 1.5V
VIN = 2.4V
3.2
3.1
0
100 200 300 400 500 600
Output Current (mA)
Output Voltage vs. Output Current
(VOUT = 5V; TA = 25°C)
5.2
5.1
VIN = 1.2V
5
4.9
VIN = 1.5V VIN = 2.4V
VIN = 3.6V
4.8
0
100 200 300 400 500 600
Output Current (mA)
Minimum Start-Up Voltage vs. Output Current
(VOUT = 3.3V; TA = 25°C)
1.5
1.35
1.2
1.05
0.9
0.75
0.6
0 20 40 60 80 100 120 140 160 180 200
Output Current (mA)
Maximum Output Current vs. Input Voltage
(L = 4.7µH; TA = 25°C)
1000
800
VOUT = 3.3V
600
400 VOUT = 5V
200
0
0.5 1 1.5 2 2.5 3 3.5 4 4.5
Input Voltage (V)
1217.2007.07.1.0
5
5 Page 
AAT1217
600mA, 1.2MHz, Micropower
Synchronous Step-Up Converter
are ideal for high power applications. Large areas of
copper have lower resistance and help to dissipate
heat. The converter's ground should join the system
ground to which it supplies power at one point only.
Figure 1 is the schematic for a highly efficient load
disconnect application circuit for the AAT1217. An
example PCB layout for the AAT1217 is shown in
Figures 2 and 3.
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L1
4.7µH
D1
MBR0520
VIN 0.85V
CIN
4.7µF
1
SW
6
VIN
5
VOUT
AAT 1217
4
SHDN
GND
2
FB 3
Q1
Si2305 DS
VOUT
3.3V,100mA
R4
510kΩ
R1
1 .02M Ω
COUT
4.7µF
R2
604kΩ
ON/OFF Control
R3
510kΩ
Q2
2N3904
Figure 1. AAT1217 High Efficiency Load Disconnect Application Circuit
Figure 2. AAT1217 Evaluation Board Layout
Example Top Layer
Figure 3. AAT1217 Evaluation Board Layout
Example Bottom Layer
1217.2007.07.1.0
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AAT1217.PDF ] | |
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