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PDF AT1793 Data sheet ( Hoja de datos )
| Número de pieza | AT1793 | |
| Descripción | 2-Channel Step-Down PWM Controller | |
| Fabricantes | Aimtron Technology | |
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AT1793
Preliminary Product Information
2-Channel Step-Down PWM Controller
Features
• 4.75V to 26V supply voltage operating.
• Efficiency up to 85%.
• Typical frequency operation to 1MHz.
• Voltage-mode PWM step-down regulation.
• 1V±2% internal reference.
• Shutdown current less than 30uA.
• Soft-start built-in.
• Short-circuit protection build-in
• QFN-16 & SOP-14 package.
Applications
•DC-DC power management.
General Description
AT1793 is a voltage-mode PWM step-down
controller capable of driving loads over a wide
input supply range with excellent line and load
regulation characteristics. High efficiency is
obtained through the use of a low Rds(on)
P-channel power switch.
It uses a fixed switching frequency up to 1MHz
thus allowing smaller sized components. The
output voltage level is user-programmable via an
external resistive voltage divider. The built-in
soft-start can reduce inrush current on the input
source at turn on. The built-in short-circuit
protection can prevent from a short-circuit.
The AT1793 also has built-in 2 control pins that
can power down the regulator to a shutdown mode.
In shutdown mode the regulator draws less than
30uA of supply current
AT1793 is available in QFN-16 or SOP-14
package.
Block Diagram
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
12/14/2006 REV:0.9
Email: [email protected]
1
1 page  
AT1793
Preliminary Product Information
2-Channel Step-Down PWM Controller
Electrical Characteristics
(VIN=12V, Ta =+25℃ , unless otherwise noted. )
Parameter
Symbol
Condition
VIN UVLO threshold
UVLO hysteresis
Quiescent Current
Current in standby mode 1
EN high level voltage
EN low level voltage
<Step down controller>
VUVLO
ICC(VIN)
IST(VIN)
VENH
VENL
EN1=EN2=5V,
FB1=FB2=1.5V
EN1=EN2=0V,
FB1=FB2=1.5V
The initial state of EN is H
level.
Virtual Ground Voltage
VG
Oscillator Frequency
FB Threshold Voltage
FB Input Bias Current
fosc
VT
IT VFB=1V
SW sink current
SW source current
SW rising time
SW falling time
ISINK
ISOURCE
trv
tfv
VFB =0V, VSW =VIN-5V
VFB=1.5V,
VSW =VIN-0.5V
CL =1.5nF, TA=250C
CL =1.5nF, TA=250C
< Soft start >
Charging current
ICSS
Voltage at soft start
completion
Vtss
< Short circuit detection and protection>
Charging current
ICSCP
SS1 and SS2>0.5V
VFB1 or VFB2<0.8V
Threshold voltage
Vtscp
SS1 and SS2>0.5V
VFB1 or VFB2<0.8V
Min.
4.1
--
Values
Typ.
4.3
0.2
Unit
Max.
4.5 V
-- V
-- 0.6 1 mA
-- 30 50 µA
2 -- 5 V
0 -- 0.5 V
-- VIN-4.5V --
0.8 1.0 1.2
0.98 1 1.02
-- -- 1
-- 30 --
V
MHz
V
µA
mA
-- -30 -- mA
-- 125 -- ns
-- 125 -- ns
2 4 6 µA
0.4 0.5 0.6 V
2 4 6 µA
0.7 0.8 0.9 V
Truth table of mute mode operation
EN1
H or Floating
L
EN2
L
H or Floating
CH I
Active
Disable
CH II
Disable
Active
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
12/14/2006 REV:0.9
Email: [email protected]
5
5 Page 
Typical Characteristics :
AT1793
Preliminary Product Information
2-Channel Step-Down PWM Controller
z Load Transient Response ( CH3=Output voltage, CH4=Io.)
Fig. 9: Ex1,VIN=12V, Io=0.25A to 2.5A
Fig. 10: Ex2, VIN=24V, Vo=5.0V, Io=0.1A to 1A
Fig. 11: Ex3, VIN=12V, Vo=3.3V, Io=0.1A to 1A
Fig. 12: Ex4, VIN=24V, Vo=3.3V, Io=0.2A to 2A
Fig. 13: Ex5, VIN=12V, Vo=2.5V, Io=0.15A to 1.5A
Fig. 14: Ex6, VIN=12V, Vo=1.8V, Io=0.2A to 2A
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
12/14/2006 REV:0.9
Email: [email protected]
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet AT1793.PDF ] | |
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