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PDF AT1382B Data sheet ( Hoja de datos )
| Número de pieza | AT1382B | |
| Descripción | 4-Channel DC-DC Converter | |
| Fabricantes | Aimtron Technology | |
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AT1382B
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Features
• Low start-up power supply voltage :1.4V(CH4)
• Wide supply voltage range from 1.8V to 7V
(CH1~4)
• High speed operation is possible: Maximum
1 MHz
• Supports for down and up/down Zeta
conversion (CH1)
• Supports for up, flyback and up/down SEPIC
conversion (CH2,3,4)
• Totem-pole type output for MOSFET
• Built-in On/Off function
• Built-in Short-Circuit Protection
Applications
• Digital Cameras
• CCD Imaging Devices
• Camcorders
General Description
The AT1382B is a 4-channel PWM DC/DC control
IC for low voltage applications with a soft start
function and short circuit detection function. This
IC is ideal for up conversion, down conversion,
and up/down conversion (using a step-up/step-
down Zeta(CH1) and SEPIC(CH2,3,4) system with
free input and output settings). Four channels can
be built in the LQFP48 package, each channel be
controlled, and soft-start.
The AT1382B include one comparator to generate
low-battery warning outputs. It also contains a gain
block that can be used with an external P-channel
MOSFET to make a low-dropout linear regulator.
Pin Assignment
Ordering Information
Part number
AT1382BF
Package
LQFP48
Marking
AT1382BF
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
1
1 page  
AT1382B
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Electrical Characteristics
Parameter
Symbol
Condition
Reference voltage block [REF]
Reference voltage
Output voltage temperature
stability
Input stability
VREF
△VREF
/VREF
Ta = -30℃ to 85℃
Line VCC=1.8V to 7V
Load stability
Load VREF=0mA to –1mA
Shout circuit output current
IOSC
Under voltage lockout block [U.V.L.O]
Threshold voltage(CH1~CH3)
Hysteresis width(CH1~CH3)
Reset voltage(CH1~CH3)
CH4 Pre-OSC change to Main-
OSC threshold
VTH
VH
VRST
VTH2
VREF=0.7V
Soft start block [CS]
Charge current
ICS
Short circuit detection block [SCP]
Threshold voltage
Input source current
VTH
ICSCP
Triangular wave oscillator block [OSC]
Oscillator frequency
Frequency stability for voltage
fOSC CT=100pF, RT=20kΩ
△f
/fdv
VCC=1.8V to 7V
Frequency stability for
temperature
△f
/fdt
Ta=-30℃ to 85℃
Error amplifier block [Error Amp](CH1~CH4)
Threshold voltage
VTH FB=0.9V
VT temperature stability
△VT/VT Ta = -30℃ to 85℃
Input bias current
Voltage gain
IB IN=0V
AV DC
(Ta=25℃, VCC=PVCC=5V)
Measure result
Min. Typ. Max.
Unit
0.88 0.90 0.92 V
- 0.5 - %
-10 - 10 mV
-10 - 10 mV
-20 -5
-1 mA
1.5 1.6 1.7 V
- 0.2 - V
1.6 1.7 1.8 V
- 1.7 - V
-6.0 -5.0 -4.0 μA
0.65 0.70 0.75 V
-1.5 -1.0 -0.7 μA
400 500 600 kHz
- 1 10 %
- 1 -%
0.69 0.70 0.71 V
- 0.5 - %
-320 -80 - nA
- 100 - dB
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
5
5 Page 
AT1382B
Preliminary Product Information
4-Channel DC-DC Converter for DSC
2. Channel control function
The channels are turned on and turned off depending on the voltage levels at the CTL, CTL1,
CTL2, CTL3 and CTL4. Described as follow.
Voltage level at CTL pin
CTL CLT1 CLT2 CLT3
LXXX
L
L
H
LL
H
H
HL
L
H
HL
H
H
X：Undefined
CLT4
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
Channel on / off state
CH1 CH2 CH3 CH4
OFF (Standby state)
OFF OFF
OFF ON
ON OFF
ON
OFF OFF OFF
ON ON
ON OFF
ON
OFF OFF
OFF ON
ON OFF
ON
ON OFF OFF
ON ON
ON OFF
ON
3. Protective Functions
•Short circuit protection and timer latch
The short circuit detection comparator in each channel detects the output voltage level of power
converter. When any channel output voltage falls below the short-circuit detection level, there is a
constant current bias charging the external capacitor CSCP which connected to the CSCP pin until
the capacitor voltage level reaches about 0.7V then turn off the output transistor and disable the IC.
It could reset the actuated protection by restart the power source.
•Under-voltage lockout protection
The under-voltage lockout protection is to disable the IC while the supply voltage transient state or
momentary decrease, which may cause the IC to malfunction. To prevent such malfunctions, the
under-voltage lockout protection circuit detects a decrease in internal reference voltage with
respect to the power supply voltage, turns off the output transistor, and sets the dead time to 100%
while holding the CSCP pin at the “L” level.
The circuit restores the output transistor to normal when the power source voltage reaches the
threshold voltage of the under-voltage lockout protection circuit.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AT1382B.PDF ] | |
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