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PDF AT1382A Data sheet ( Hoja de datos )
| Número de pieza | AT1382A | |
| Descripción | 4-Channel DC-DC Converter | |
| Fabricantes | Aimtron Technology | |
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AT1382A
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 up, flyback and up/down SEPIC
conversion (CH1~4)
• 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 AT1382A 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 SEPIC system with free input and output
settings). Four channels can be built in the
LQFP48 package, each channel be controlled, and
soft-start.
The AT1382A 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
AT1382AF
AT1382AF_PBF
AT1382AF_GRE
Package
LQFP48
LQFP48, PB-Free
LQFP48,Green
Marking
AT1382AF
AT1382AF,date code with one bottom line
AT1382AF,date code with two bottom line
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  
AT1382A
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 
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Function Description
1. Power Converter Functions
•Reference voltage block
The reference voltage circuit generates a temperature independence voltage (typical = 0.9V) from
the power source, which is used as reference voltage for the IC’s internal circuitry and supply load
current above 1mA to external device.
•Triangular oscillator block
The triangular wave oscillator is generated by timing resistor (RT) and timing capacitor(CT) to
incorporate each other. The waveforms CT (amplitude of 0.3V to 0.7V), CT1 (amplitude 0.25V
to 0.65V in phase with CT) and CT2 (amplitude 0.25V to 0.65V in inverse phase with CT) are
input to the PWM comparator.
•Error amplifier block
The error amplifier outputs controlling error signal to PWM comparator from sensing DC/DC
converter output voltage. In addition , an arbitrary loop gain can be set by connecting feedback
resistor and capacitor from the output pin to inverted input pin of the error amplifier, in order to
make a stable phase compensation to the system.
•PWM comparator block
The PWM comparator is a voltage-to-pulse width converter for controlling the duty cycle of
DC/DC converter.
Channels 1and 2 main sides, channel 3 and 4 : The comparator keeps the output transistor turn on
while the error amplifier output voltage and DTC voltage still higher than the triangular wave
voltage.
Channels 1 and 2 synchronous rectification sides : The comparator keeps the output transistor turn
on while the error amplifier output voltage still lower than the triangular wave voltage.
•Output block
The output block is the totem pole configuration , which could drive external MOSFET or
transistor.
•Battery low detect block
The AT1382A battery-low comparator open-drain output LBO sinks up to 1mA if the LBI input is
below its threshold voltage. Connect LBO to power source with a 100K~1MΩ pullup resistor.
•Analog gain block
The AT1382A analog gain block is a voltage amplifier with a gain of 100 and a push-pull output
stage with 2mA drive capability. The analog gain block can be used with an external P-channel
MOSFET pass transistor to build a low-dropout linear regulator. Connect ENLD to High to enable
the gain block.
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 25 Páginas | |
| PDF Descargar | [ Datasheet AT1382A.PDF ] | |
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