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PDF AT1367B Data sheet ( Hoja de datos )
| Número de pieza | AT1367B | |
| Descripción | Synchronous Buck Converter | |
| Fabricantes | Aimtron Technology | |
| Logotipo |  |
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AT1367A/B/C/D
Preliminary Product Information
1MHz, 800mA Synchronous Buck Converter
With Power Good Detector & LDO
Features
General Description
• Operation Voltage 2.5V~6.0V
The AT1367A/B/C/D provides complete
• Oscillation frequency 1MHz
control for a DC/DC converter optimized for
• Output Current Maximum 800mA（DC-DC hight-performance microprocessor applications. It
Converter）
consists of a synchronous step-down DC/DC
• Built-In 400mA/LDO
converter and a high-speed LDO regulator
• Power Good Indicator with Time Delay
connected in series with the DC/DC converter
Adjustable
output. A power good detector and LDO ON/OFF
• Built-In Current Limit
control is also built-in(metal option). DC/DC
• Built-In UVLO
converter is operated on current mode architecture
• Built-In Thermal ShutDown
for excellent line and load transient response.
• Built-In LDO ON/OFF Control（Metal Option） 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
Applications
• Power Supply for Slim Type devices
diode. The AT1367A/B/C/D 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
5
CTL
DELAY
PG
/PG
OSC
Control
LDO
CTL
Vref
+
R5
VCC
-
Auto
Discharge
*CTL and /PG
Metal Option
0.9 x
Vref
0.35uA
R2
UVLO
-
+
Vref
Shoot
Throught
R1
Current
Limit
R3
+
CTL R4
-
*OUT2=2.5V/1.8V
Metal Option
Vref
VCC
SW
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
3/2/2006 REV:1.2
Email: [email protected]
1
1 page  
AT1367A/B/C/D
Preliminary Product Information
1MHz, 800mA Synchronous Buck Converter
With Power Good Detector & LDO
Typical characteristics
100
95
90
85
80
75
70
65
60
55
50
10
Efficiency VS. Output1 Current
L=2.2uH
L=3.3uH
L=4.7uH
100
Output1 Current(mA)
1000
100
95
90
85
80
75
70
65
60
55
50
10
Efficiency VS. Output1 Current
VCC=5V
VCC=4.2V
VCC=3.6V
100
Output1 Current(mA)
1000
CH1：Vin, CH2：Vout1, CH3：PG, CH4：/PG CH1：Vout1, CH2：Vout2, CH3：PG, CH4：CTL
CH1：Vout1, CH2：Vout2, CH4：Iout1
Iout1=100mA~400mA, Iout2=300mA
CH1：Vout1, CH2：Vout2, CH4：Iout2
Iout1=300mA, 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
3/2/2006 REV:1.2
Email: [email protected]
5
5 Page 
AT1367A/B/C/D
Preliminary Product Information
1MHz, 800mA Synchronous Buck Converter
With Power Good Detector & LDO
Inductance(µH)
3.3
4.7
3.3
3.3
4.7
Capacitance(µF)
22
47
10
2.2
4.7
Inductors Surface Mount
Manufacturer/Part No.
Sumida CDRH4D28-3R3
Sumida CDRH5D18-4R7
Mitsumi C3-K1.8L-3R3
Mitsumi C4-K1.8L-3R3
ABC SH40283R3YSB
ABC SH40284R7YSB
Manufacturer Website
www.sumida.com
www.mitsumi.co.jp
www.atec-group.com
Capacitors Surface Mount
Manufacturer/Part No.
TDK C3216X5R0J226M
TDK C3225X5R0J46M
GRM42-6X5R 106K6.3
TAIYO LMK212BJ225MD
TAIYO JMK212BJ475MG
Manufacturer Website
www.tdk.com
www.tdk.com
www.murata.com
www.t-yuden.com
www.t-yuden.com
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
3/2/2006 REV:1.2
Email: [email protected]
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AT1367B.PDF ] | |
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