ETC AT1382A

AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Features
General Description
• 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.
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/stepdown SEPIC system with free input and output
settings). Four channels can be built in the
LQFP48 package, each channel be controlled, and
soft-start.
Applications
• Digital Cameras
• CCD Imaging Devices
• Camcorders
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
AT1382A
Package
LQFP48
Marking
AT1382AF
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: service@aimtron.com.tw
1
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Pin Description
Pin No. Pin name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
DTC4
FB4
IN4
CS4
CTL4
DTC3
FB3
IN3
CS3
CTL3
CSCP
VREF
GND
GND
VBG
VCC
VCC
POR
RT
CT
VB
CTL
ENLD
CT2
CTL2
CS2
IN2
FB2
DTC2
CTL1
CS1
IN1
FB1
DTC1
LBI
LBO
AI
AO
OUT1_1
OUT1_2
OUT2_1
OUT2_2
N.C.
PVCC
N.C.
PGND
OUT3
OUT4
I/O
I
O
I
I
I
O
I
I
O
P
P
TEST
P
P
TEST
O
I
I
TEST
I
I
O
I
I
I
O
I
I
O
I
O
O
O
O
O
P
P
O
O
Function
CH4 Dead Time Control
CH4 Error Amplifier Output
CH4 Error Amplifier Inverted Input
CH4 Soft Start Setting Capacitor
CH4 ON/OFF Control
CH3 Dead Time Control
CH3 Error Amplifier Output
CH3 Error Amplifier Inverted Input
CH3 Soft Start Setting Capacitor
CH3 ON/OFF Control
Timer Latch Short-Circuit Detection Capacitor Input
Reference 0.9V Output
Ground
Ground
Reference Test Pin
Power Supply
Power Supply
Pre-OSC Change to Main-OSC Indicator
Oscillation Frequency Setting Resistor
Oscillation Frequency Setting Capacitor
Reference 1.8V Output
Power Supply Control
Gain Block Enable Input
Triangular wave OSC Inverted output Test Pin
CH2 ON/OFF Control
CH2 Soft Start Setting Capacitor
CH2 Error Amplifier Inverted Input
CH2 Error Amplifier Output
CH2 Dead Time Control
CH1 ON/OFF Control
CH1 Soft Start Setting Capacitor
CH1 Error Amplifier Inverted Input
CH1 Error Amplifier Output
CH1 Dead Time Control
Low Battery Detected Input
Low Battery Indicator
LDO Regulated Input
LDO Drive Output
CH1 Main Side Output
CH1 Synchronous Rectifier Side Output
CH2 Main Side Output
CH2 Synchronous Rectifier Side Output
Drive Output Block Power Supply
Drive Output Block Ground
CH3 Output
CH4 Output
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: service@aimtron.com.tw
2
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Block Diagram
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: service@aimtron.com.tw
3
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Absolute Maximum Ratings
Parameter
Symbol
Condition
Vcc
--
Power supply voltage
Rating
Min
Max
Unit
--
8
V
Output current
Io
Output pin
--
20
mA
Output peak current
Io
Output pin, Duty≦5%
--
200
mA
Power dissipation
PD
Ta≦25℃ (LQFP-48P)
--
860
mW
Operation temperature
Topr
--
-30
85
℃
Storage temperature
Tstg
--
-55
125
℃
*Semiconductor devices can be permanently damaged by application of stress in excess of absolute ratings. Do not
exceed these ratings.
Recommended Operating Conditions
Value
Parameter
Symbol
Condition
Unit
Min
Typ
Max
Startup power supply voltage
Vcc
CH4
1.4
--
7
V
Power supply voltage
Vcc
CH4
CH1 to CH3
1.5
1.8
5.0
5.0
7
7
V
V
Reference voltage output current
IOR
VREF pin
-1
--
0
mA
VB pin output current
IB
VB pin
-0.5
--
0
mA
Input voltage
VIN
IN1 to IN4 pins
0
--
Vcc-1.8
V
Control input voltage
VCTL
CTL pin
0
--
7
V
OUT pin (CH1 to CH3)
--
2
15
mA
OUT pin (CH4)
1
2
15
mA
Output current
Io
Oscillator
fOSC
--
100
500
1000
kHz
Timing capacitor
CT
--
47
100
560
pF
Timing resistor
RT
--
8.2
18
100
kΩ
Cs
CH1 to CH3
--
0.027
1.0
μF
CH4
--
0.47
1.0
μF
Soft start capacitor
CCS4
Short detection capacitor
CSCP
--
--
0.1
1.0
μF
VB pin capacitor
CVB
--
0.082
0.1
--
μF
Operating ambient temperature
Ta
--
-30
25
85
℃
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: service@aimtron.com.tw
4
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Electrical Characteristics
(Ta=25℃, VCC=PVCC=5V)
Parameter
Symbol
Condition
Measure result
Unit
Min. Typ. Max.
Reference voltage block [REF]
Reference voltage
Output voltage temperature
stability
VREF
△VREF
Ta = -30℃ to 85℃
/VREF
0.88
0.90
0.92
V
-
0.5
-
%
Input stability
Line
VCC=1.8V to 7V
-10
-
10
mV
Load stability
Load
VREF=0mA to –1mA
-10
-
10
mV
Shout circuit output current
IOSC
VREF=0.7V
-20
-5
-1
mA
Under voltage lockout block [U.V.L.O]
Threshold voltage(CH1~CH3)
VTH
1.5
1.6
1.7
V
Hysteresis width(CH1~CH3)
VH
-
0.2
-
V
Reset voltage(CH1~CH3)
VRST
1.6
1.7
1.8
V
CH4 Pre-OSC change to MainOSC threshold
VTH2
-
1.7
-
V
VSTB
-
50
100
mV
ICS
-6.0
-5.0
-4.0
μA
Threshold voltage
VTH
0.65
0.70
0.75
V
Input standby voltage
VSTB
-
50
100
mV
Input latch voltage
VI
-
50
100
mV
Input source current
ICSCP
-1.4
-1.0
-0.6
μA
450
500
550
kHz
Soft start block [CS]
Input standby voltage
Charge current
Short circuit detection block [SCP]
Triangular wave oscillator block [OSC]
Oscillator frequency
fOSC
CT=100pF, RT=20kΩ
Frequency stability for voltage
△f
/fdv
VCC=1.8V to 7V
-
1
10
%
Frequency stability for
temperature
△f
/fdt
Ta=-30℃ to 85℃
-
1
-
%
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: service@aimtron.com.tw
5
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Parameter
Symbol
Condition
Measure result
Unit
Min. Typ. Max.
Error amplifier block [Error Amp](CH1~CH4)
Threshold voltage
VT temperature stability
VTH
FB=0.9V
0.69
0.70
0.71
V
△VT/VT Ta = -30℃ to 85℃
-
0.5
-
%
-320
-80
-
nA
Input bias current
IB
IN=0V
Voltage gain
AV
DC
-
100
-
dB
Frequency bandwidth
BW
AV=0dB
-
10
-
MHz
VOH
1.3
1.4
-
V
VOL
-
50
200
mV
-
-4.0
-1.0
mA
70
140
-
μA
CH1 to CH4
0.65
0.7
0.75
V
IN=0V
-320
-80
-
nA
Duty = 0 %
0.25
0.3
-
V
-
0.75
0.80
V
0.20
0.25
-
-
0.65
0.70
-1.0
-0.3
-
μA
-
-130
-80
mA
65
100
-
mA
Output voltage
Output source current
Output sink current
ISOURCE FB=0.5V
ISINK
FB=0.5V
Short detect comparator [SCP Comp]
Threshold voltage
VTH
Input bias current
IB
PWM Comp. [PWM Comp]
Threshold voltage(CH4)
Threshold voltage(CH1~3)
Input current
VT0
VTmax
VT0
Duty = 100 %
Duty = 0 %
VTmax
Duty = 100 %
IDTC
DTC=0.4V
Output block (CH1,2) [Pin 40,42]
Output source current
Output sink current
Output ON resistor
ISOURCE Duty≧95%, OUT=0V
ISINK
Duty≦5%, OUT=5V
ROH
OUT = -15mA
-
18
30
Ω
ROL
OUT = 15mA
-
16
25
Ω
ISOURCE Duty≧95%, OUT=0V
-
-130
-80
mA
65
100
-
mA
Output block (CH1 to CH3) [Pin 39,41,47]
Output source current
Output sink current
Output ON resistor
ISINK
Duty≦5%, OUT=5V
ROH
OUT = -15mA
-
18
30
Ω
ROL
OUT = 15mA
-
16
25
Ω
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: service@aimtron.com.tw
6
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Parameter
Symbol
Condition
Measure result
Unit
Min. Typ Max.
Output block (CH4) [Pin 48]
Output source current
ISOURCE Duty≧95%, OUT=0V
Output sink current
Output ON resistor
-
-260
-160
mA
150
260
-
mA
ISINK
Duty≦5%, OUT=5V
ROH
OUT = -15mA
-
9
15
Ω
ROL
OUT = 15mA
-
9
15
Ω
VIH
Active mode
1.3
-
7
V
VIL
Standby mode
0
-
0.8
V
VIH
Active mode
1.3
-
7
V
VIL
Standby mode
0
-
0.8
V
ICTL
CTL = 5V
-
5
20
μA
1.20
1.22
1.24
V
-0.1
-
1.3
V
-
-
100
nA
70
100
140
V/V
Control block [CTL]
CTL input voltage
CTL1 to CTL4 input voltage
Input current
Analog gain block [AO,AI]
AI feedback regulation voltage
VAO=VOUT-1.22V
AI input common-mode range
AI input current
VAI=1.32V
AI to AO voltage gain
AO output sink current
VAI=1V, VAO=2V
0.5
2.5
-
mA
AO output source current
VAI=1.5V, VAO=2V
0.5
2.5
-
mA
1.2
-
7
V
0
-
0.8
V
LBI detect threshold
1.20
1.22
1.24
V
Detect Hysteresis
-50
+50
mV
ENLD enable
VIH
Active mode
ENLD disable
VIL
Standby mode
Low battery detect block [LBI, LBO]
LBO output voltage low
Isink=1mA
-
-
0.4
V
LBO output high leakage
VLBO=5V
-
0.01
1
μA
-
-
10
μA
-
-
10
μA
-
3
6
mA
General
Icss
Standby current
Power supply current
CTL=0V
CTL=0V
Icss(o) CTL1=CTL2=CTL3=
CTL4="H"
CTL=CTL1=CTL2=C
Icc
TL3=CTL4=ENLD="
H"
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: service@aimtron.com.tw
7
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Typical Application
A.
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: service@aimtron.com.tw
8
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
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: service@aimtron.com.tw
9
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
B. Using AT1382A on Buck Cnverter
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: service@aimtron.com.tw
10
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: service@aimtron.com.tw
11
AT1382A
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.
CTL
L
Voltage level at CTL pin
CLT1
CLT2
CLT3
X
X
X
L
L
H
L
L
H
H
H
L
L
H
H
L
H
H
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
OFF (Standby state)
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
ON
CH4
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
X:Undefined
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: service@aimtron.com.tw
12
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
4.
Soft Start Operation
When the CTL , CTL1, CTL2, CTL3 and CTL4 terminals are driven high level at the same time. The
driving scheme is described as follow diagram.
The capacitor connected to the CS1,CS2,CS3 and CS4 terminal starts charging and provides a soft
start by comparing the CH1 to CH4 output 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: service@aimtron.com.tw
13
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
•When the CTL terminal is switch on, then each of the terminals CTL1, CTL2, CTL3, and CTL4
can be switched on or off independently. Any of the CTL1, CTL2, CTL3 and CTL4 terminals
are driven high level. The driving scheme is described as follow diagram.
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: service@aimtron.com.tw
14
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
5.
Soft start setting
The soft start operation is determined by the capacitor connected to the CS1~CS4 terminal.
Consider the input voltage and load current to design the soft start time.
The soft start time until the DC/DC converter output voltage reaches 95%. It can calculate the soft
start time Ts (s).
Ts (s) = 0.084 * CS (μF)
VCS = 0.7 × (1 − e
−(
Ts
)
R ×Cs
)
R=
33.6 × 117.6
KΩ
33.6 + 117.6
The soft start function of CH1 to CH4 are the same. It could be disabled soft start function by
floating CS pin.
6.
Setting the output 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: service@aimtron.com.tw
15
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
7.
Setting time constant for Time-latch Short-circuit protection
The SCP comparator detects each channel output voltage while the power converter work at
normal condition. Q1 is turn on, and the voltage level of CSCP pin is held at low level. If the load
of one channel rapidly due to a short of the load, causing the output voltage to drop, the SCP
comparator output on that channel goes to "H" level. The transistor Q1 to be turned off and the
external capacitor CSCP to be charged at 1.0μA. The time period of short circuit protection as show
below equation.
tPE(s): Short detection time
tPE (s) = 0.7 * CSCP (μF)
When the CSCP is charged to the 0.7V, the timer-latch is set and output is turn off (dead time is set to 100
﹪). At this point, the timer-latch is closed and the CSCP terminal is held at "L" level. It could be
disabled short circuit protection function by connecting CSCP pin into the ground.
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: service@aimtron.com.tw
16
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
8.
Setting the triangular oscillator frequency
The triangular oscillator frequency is determined by the timing capacitor (CT) connected to the CT
terminal, and the timing resistor (RT) connected to the RT terminal.
f OSC ( kHz ) =
9.
1000000
CT ( PF ) × RT ( kΩ)
Setting the DEAD time
When using step up or SEPIC or flyback DC/DC converter, it must prevent that output transistor
works at full-ON state (ON duty = 100%). To prevent this situation, set the maximum duty of these
channels. To set it, set the voltage at the DTC terminal by applying a resistive voltage divider to
the VREF as shown below.
When the voltage at the DTC pin is higher than the triangular wave voltage (CT), the output
transistor is turned on. The maximum duty calculation formula assuming that triangular wave
amplitude = ∆V1(CH4=0.45,CH1~3=0.4) and triangular wave minimum voltage = Vx
(CH4=0.3,CH1~3=0.25).
DUTY (ON ) max =
Vd − Vx
× 100﹪
∆V 1
If don't setting maximum duty, connect DTC terminal directly to the VREF terminal.
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: service@aimtron.com.tw
17
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
10.
Setting low battery detector threshold voltage
The low battery detected threshold voltage is determined by the external resistor connected to the
LBI terminal. If Vin (battery voltage) under setting threshold voltage, low battery detect output
terminal (LBO) is hold at "L" level. The driving scheme is described as follow diagram.
11. Decrease the Output Overshoot
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: service@aimtron.com.tw
18
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Synchronous Rectification Reference Data
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: service@aimtron.com.tw
19
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
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: service@aimtron.com.tw
20
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
*if VCC=PVCC=3.3V, the efficiency will decrease about 0.2~05 % because of the NMOSFET AO3400 Rds(on) increase.
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: service@aimtron.com.tw
21
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Typical Characteristics
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: service@aimtron.com.tw
22
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
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: service@aimtron.com.tw
23
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Package Outline
LQFP48
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: service@aimtron.com.tw
24
AT1382A
Preliminary Product Information
4-Channel DC-DC Converter for DSC
Reflow Condition (IR/Convection or VPR Reflow)
Reference JEDEC Standard J-STD-020A
Classification Reflow Profiles
Convection or
IR/Convction
Average Heating Rate(180°C to peak)
5°C/second max.
120 seconds max.
Preheat Temperature(125±20°C)
10~150 seconds
Temperature maintained above 180°C
10~20
seconds
Time within 5°C of actual Peak
Temperature
Peak Temperature Range(Note 1)
219~225°C or
235~240°C
Cooling Rate
6°C /second max.
6 minutes max.
Time 25°C to Peak Temperature
VPR
10°C/second max.
60 seconds
219~225°C or
235~240°C
10°C/second max.
*1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions.
Package Reflow Conditions
Pkg. Thickness ≥2.5mm Pkg. Thickness <2.5mm Pkg. Thickness <2.5mm
and
and
and all bags
3
Pkg. Volume ≥350 mm
Pkg. Volume <350 mm3
Convection 219~225°C
VPR 219~225°C
IR/Convection 219~225°C
Convection 235~240°C
VPR 235~240°C
IR/Convection 235~240°C
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: service@aimtron.com.tw
25