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PDF AT1387A Data sheet ( Hoja de datos )
| Número de pieza | AT1387A | |
| Descripción | 6-Channel DC-DC Converter | |
| Fabricantes | Aimtron Technology | |
| Logotipo |  |
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AT1387A
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Features
General Description
• Low start-up power supply voltage :1.4V(CH6)
• Wide supply voltage range from 2.5V to 6.5V
(CH1~6)
• High speed operation is possible: Maximum
The AT1387A is a 6-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,
1 MHz
and up/down conversion (using a step-up/step-
• Supports for up, flyback and up/down SEPIC down SEPIC ,Zeta system with free input and
conversion (CH3,4,5,6)
output settings). 6 channels can be built in the
• Supports for down and up/down Zeta conversion LQFP48 package, each channel be controlled, and
(CH1,2)
soft-start.
• Synchronized rectification on CH1,CH2
• Supports for negative voltage feedback CH5
The AT1387A include one comparator to generate
• Built-in On/Off function
low-battery warning outputs. It also contains two
• Built-in Soft-Start Function
• Built-in Short-Circuit Protection.
high efficiency topology by using synchronous
rectification PWM(It can be disable by floating
OUT1_2,OUT2_2.)
Applications
• Digital Cameras
• CCD Imaging Devices
• Camcorders
Pin Assignment
Ordering Information
Part number
AT1387AF
AT1387AF_PBF
AT1387AF_GRE
Package
LQFP48
LQFP48, PB-Free
LQFP48, Green
Marking
AT1387AF
AT1387AF, date code with one bottom line
AT1387AF, 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  
AT1387A
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Electrical Characteristics
Parameter
Symbol
Condition
Reference voltage block [REF]
Regulator voltage
Output voltage temperature
stability
VREG
△VREF
/VREF
TA = -30℃ to 85℃
Input stability
Line VCC=2.5V to 6V
Load stability
Load VREG=0mA to –10mA
Under voltage lockout block [U.V.L.O]
(TA=25℃, VCC=PVCC=5V)
Measure result
Min. Typ. Max.
Unit
2.25 2.30 2.35 V
- 0.5 - %
-80 - 80 mV
-20 - 20 mV
Threshold voltage(CH1~CH5)
VTH
2.0 2.2 2.3 V
Hysteresis width(CH1~CH5)
CH6 Pre-OSC change to Main-
OSC threshold
Hysteresis width(CH6 Pre-OSC
change to Main-OSC threshold)
VH1_5
VTH6
VH6
Pre-OSC frequency
fPRE-OSC
Soft start block [CS]
Charge current
ICS
Valid Threshold voltage
Short circuit detection block [SCP]
Threshold voltage
VTH
Input source current
ICSCP
Short detect comparator [SCP Comp]
Threshold voltage
Input bias current
VTH CH1 to CH6
IB IN=0V
Triangular wave oscillator block [OSC]
0.05 0.1 0.3 V
2.2 2.3 2.5 V
0.05 0.1 0.3 V
320 400 480 KHz
-1.5 -1.0 -0.7 μA
0.3 - 0.8 V
0.80 0.90 1.00 V
-1.5 -1.0 -0.6 μA
0.65 0.7 0.75 V
-320 -80 - nA
Oscillator frequency
Frequency stability for voltage
fOSC CT=82pF
△f
/fdv
VCC=2.5V to 6V
400 500 600 kHz
- 1 10 %
Frequency stability for
temperature
△f
/fdt
TA=-30℃ to 85℃
- 1 10 %
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 
Function Description
AT1387A
Preliminary Product Information
6-Channel DC-DC Converter for DSC
1. Power Converter Functions
＊Reference voltage block
The reference voltage circuit generates a temperature independence voltage
(typical=2.3V) from the power source, which is used as reference voltage for the
IC’s internal circuitry and supply load current above 10mA to external device.
＊Triangular oscillator block
The triangular wave oscillator is generated by timing capacitor(CT) to incorporate
each other. The waveforms CT (amplitude of 0.3V to 0.8V), CTP (amplitude
0.3V to 0.8V in phase with CT) and CTN (amplitude 0.3V to 0.8V 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 system.
＊CH5 Inverting amplifier block
The inverting amplifier detects the DC/DC converter output voltage (negative)
and outputs a control signal to the error amplifier.
＊PWM comparator block
The PWM comparator is a voltage-to-pulse width converter for controlling the
duty cycle of DC/DC converter.
Channels 1, 2 main sides, channel 3, 4, 5, and 6 : 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, 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.
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 AT1387A.PDF ] | |
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