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PDF AT1362A Data sheet ( Hoja de datos )
| Número de pieza | AT1362A | |
| Descripción | Synchronous Buck Converter | |
| Fabricantes | Aimtron Technology | |
| Logotipo |  |
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Features
• Operation Voltage 2.5V~6.0V
• Oscillation frequency 1MHz
• Output Current Maximum 400mA（DC-DC
Converter）
• Built-In 400mA/LDO
• Power Good Indicator with Time Delay
Adjustable
• Built-In Current Limit
• Built-In UVLO
• Built-In Thermal ShutDown
Applications
• Power Supply for Slim Type devices
AT1362A/B
Preliminary Product Information
Synchronous Buck Converter
With Power Good Detector & LDO
General Description
The AT1362A/B provides complete control for
a DC/DC converter optimized for
high-performance microprocessor applications. It
consists of a synchronous step-down DC/DC
converter and a high-speed LDO regulator
connected in series with the DC/DC converter
output. A power good detector and LDO ON/OFF
control is also built-in(metal option). DC/DC
converter is operated on current mode architecture
for excellent line and load transient response.
1MHz operation frequency is allowing the use of
small surface mount inductor and capacitor. The
internal synchronous switch increases efficiency
and eliminates the need for an external schottky
diode. The AT1362A/B is a family of low-noise
synchronous step-down DC/DC converters that is
ideally suited for systems powered form a 1-cell
Li-ion battery or from a 3-cell to 4-cell NiCd,
NiMH, or alkaline battery. It can also be used to
USB-based power system.
Block Diagram
VBG
VBG
Vref
AGND
+
SLOPE
VREG
UVLO
Current
Sense
+
RQ
-
S
DELAY
PG
OSC
Auto
Discharge
VCC
Vref
+
-
Shoot
Throught
0.7
1uA
UVLO
-
+
R2 R1
*OUT1=2.5V/1.8V
Metal Option
-
+
0.7V
CTL
VCC
5
SW
BPC
Current
Limit
+
-
R3
R4
Vref
PGND
OUT1
OUT2
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
5/30/2006 REV:1.0
Email: [email protected]
1
1 page  
AT1362A/B
Preliminary Product Information
Synchronous Buck Converter
With Power Good Detector & LDO
Typical characteristics
Efficiency VS. Output1 Current
100
95
90
85
80
75
70
65
Vin=5V
Vout1=1.8V
60
55
50
10
100
Output1 Current(mA)
L=2.2uH
L=3.3uH
L=4.7uH
L=6.8uH
1000
Efficiency VS. Output1 Current
100
95
90
85
80
75
70
65
Vout1=1.8V
L=4.7uH
60
55
50
10
100
Output1 Current(mA)
Vin=5.0V
Vin=4.2V
Vin=3.8V
Vin=3.6V
1000
CH1：Vin, CH2：Vout1
CH3：Vout2, CH4：PG
CH1：DELAY, CH2：Vout1
CH3：Vout2, CH4：PG
CH1：Vout1, CH2：Vout2, CH4：Iout1
Iout1=100mA~300mA, Iout2=200mA
CH1：Vout1, CH2：Vout2, CH4：Iout2
Iout1=200mA, Iout2=100mA~300mA
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
5/30/2006 REV:1.0
Email: [email protected]
5
5 Page 
PC Board Layout
AT1362A/B
Preliminary Product Information
Synchronous Buck Converter
With Power Good Detector & LDO
1. The most critical aspect of the layout is the placement of the input capacitor C2. It
must be placed as close as possible to the AT1362A/B to reduce the input ripple
voltage.
2. Power loops on the input and output of the converter should be laid out with the
shortest and widest traces possible. The longer and narrower the trace, the higher
resistance and inductance it will have. The length of traces in series with the
capacitors increases its ESR and ESL and reduces their effectiveness at high
frequency.
3. The OUT1 pin should connect to C1 directly. And the route should be away from
the noise source, such as inductor of SW line.
4. Grounding all components at the same point may effectively reduce the occurrence
of loop.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
5/30/2006 REV:1.0
Email: [email protected]
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AT1362A.PDF ] | |
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