Datasheet AT1382A Datasheet (AIM)

AT1382A

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/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.

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 Package Marking

AT1382A LQFP48 AT1382AF

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

1

AT1382A

4-Channel DC-DC Converter for DSC

Pin Description

Pin No. Pin name I/O Function

1 DTC4 I CH4 Dead Time Control
2 FB4 O CH4 Error Amplifier Output
3 IN4 I CH4 Error Amplifier Inverted Input
4 CS4 - CH4 Soft Start Setting Capacitor
5 CTL4 I CH4 ON/OFF Control
6 DTC3 I CH3 Dead Time Control
7 FB3 O CH3 Error Amplifier Output
8 IN3 I CH3 Error Amplifier Inverted Input

9 CS3 - CH3 Soft Start Setting Capacitor
10 CTL3 I CH3 ON/OFF Control
11 CSCP - Timer Latch Short-Circuit Detection Capacitor Input
12 VREF O Reference 0.9V Output
13 GND P Ground
14 GND P Ground
15 VBG TEST Reference Test Pin
16 VCC P Power Supply
17 VCC P Power Supply
18 POR TEST Pre-OSC Change to Main-OSC Indicator
19 RT - Oscillation Frequency Setting Resistor
20 CT - Oscillation Frequency Setting Capacitor
21 VB O Reference 1.8V Output
22 CTL I Power Supply Control
23 ENLD I Gain Block Enable Input
24 CT2 TEST Triangular wave OSC Inverted output Test Pin
25 CTL2 I CH2 ON/OFF Control
26 CS2 - CH2 Soft Start Setting Capacitor
27 IN2 I CH2 Error Amplifier Inverted Input
28 FB2 O CH2 Error Amplifier Output
29 DTC2 I CH2 Dead Time Control
30 CTL1 I CH1 ON/OFF Control
31 CS1 - CH1 Soft Start Setting Capacitor
32 IN1 I CH1 Error Amplifier Inverted Input
33 FB1 O CH1 Error Amplifier Output
34 DTC1 I CH1 Dead Time Control
35 LBI I Low Battery Detected Input
36 LBO O Low Battery Indicator
37 AI I LDO Regulated Input
38 AO O LDO Drive Output
39 OUT1_1 O CH1 Main Side Output
40 OUT1_2 O CH1 Synchronous Rectifier Side Output
41 OUT2_1 O CH2 Main Side Output
42 OUT2_2 O CH2 Synchronous Rectifier Side Output
43 N.C. ­44 PVCC P Drive Output Block Power Supply
45 N.C. ­46 PGND P Drive Output Block Ground
47 OUT3 O CH3 Output
48 OUT4 O CH4 Output

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

2

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

3

AT1382A

g

yp

4-Channel DC-DC Converter for DSC

Absolute Maximum Ratings

Parameter Symbol Condition

Ratin

Min Max

Unit

Power supply voltage Vcc -- -- 8 V

Output current Io Output pin -- 20 mA

Output peak current Io

Power dissipation P

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.

Output pin, Duty≦5%

Ta≦25℃ (LQFP-48P)

D

-- 200 mA

-- 860 mW

℃

℃

Recommended Operating Conditions

Val ue

Parameter Symbol Condition

Min T

Startup power supply voltage Vcc CH4 1.4 -- 7 V

Power supply voltage Vcc

Reference voltage output current I

VB pin output current I

Input voltage V

Control input voltage V

Output current Io

Oscillator f

Timing capacitor C

Timing resistor R

Soft start capacitor

C

Short detection capacitor C

VB pin capacitor C

Operating ambient temperature Ta -- -30 25 85

CH4 1.5 5.0 7 V

CH1 to CH3 1.8 5.0 7 V

VREF pin -1 -- 0 mA

OR

VB pin -0.5 -- 0 mA

B

IN1 to IN4 pins 0 -- Vcc-1.8 V

IN

CTL pin 0 -- 7 V

CTL

OUT pin (CH1 to CH3) -- 2 15 mA

OUT pin (CH4) 1 2 15 mA

OSC

T

T

-- 100 500 1000 kHz

-- 47 100 560 pF

-- 8.2 18 100

Cs CH1 to CH3 -- 0.027 1.0

CH4 -- 0.47 1.0

+IN6

SCP

VB

-- -- 0.1 1.0

-- 0.082 0.1 --

Max

Unit

kΩ

μF

μF

μF

μF

℃

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

4

AT1382A

4-Channel DC-DC Converter for DSC

Electrical Characteristics

(Ta=25℃, VCC=PVCC=5V)

Parameter Symbol Condition

Reference voltage block [REF]

Measure result

Min. Typ. Max.

Unit

Reference voltage V

Output voltage temperature

△V

stability

/V

REF

REF

Ta = -30℃ to 85℃

REF

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 I

VREF=0.7V -20 -5 -1 mA

OSC

Under voltage lockout block [U.V.L.O]

Threshold voltage(CH1~CH3) V

Hysteresis width(CH1~CH3) V

Reset voltage(CH1~CH3) V

CH4 Pre-OSC change to Main­OSC threshold

V

TH

H

RST

TH2

1.5 1.6 1.7 V

-0.2-V

1.6 1.7 1.8 V

-1.7-V

Soft start block [CS]

Input standby voltage V

Charge current I

STB

CS

-50100mV

-6.0 -5.0 -4.0

μA

Short circuit detection block [SCP]

Threshold voltage V

Input standby voltage V

Input latch voltage V

Input source current I

TH

STB

I

CSCP

0.65 0.70 0.75 V

-50100mV

-50100mV

-1.4 -1.0 -0.6

μA

Triangular wave oscillator block [OSC]

Oscillator frequency f

Frequency stability for voltage

Frequency stability for
temperature

OSC

△f

/fdv

△f

/fdt

CT=100pF, RT=20kΩ

VCC=1.8V to 7V - 1 10 %

Ta=-30℃ to 85℃

450 500 550 kHz

-1-%

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

5

AT1382A

4-Channel DC-DC Converter for DSC

Parameter Symbol Condition

Measure result

Min. Typ. Max.

Unit

Error amplifier block [Error Amp](CH1~CH4)

Threshold voltage V

VT temperature stability

△V

Input bias current I

Voltage gain A

FB=0.9V 0.69 0.70 0.71 V

TH

Ta = -30℃ to 85℃

T/VT

IN=0V -320 -80 - nA

B

DC - 100 - dB

V

-0.5-%

Frequency bandwidth BW AV=0dB - 10 - MHz

Output voltage

Output source current I

Output sink current I

V

OH

V

OL

SOURCE

SINK

FB=0.5V - -4.0 -1.0 mA

FB=0.5V 70 140 -

1.3 1.4 - V

-50200mV

μA

Short detect comparator [SCP Comp]

Threshold voltage

Input bias current I

V

CH1 to CH4 0.65 0.7 0.75 V

TH

IN=0V -320 -80 - nA

B

PWM Comp. [PWM Comp]

V

Duty = 0 % 0.25 0.3 - V

Threshold voltage(CH4)

Threshold voltage(CH1~3)

Input current I

T0

V

V

Duty = 100 % - 0.75 0.80 V

Tmax

V

Duty = 0 % 0.20 0.25 -

T0

Duty = 100 % - 0.65 0.70

Tmax

DTC=0.4V -1.0 -0.3 -

DTC

μA

Output block (CH1,2) [Pin 39,41]

Output source current I

Output sink current I

Output ON resistor

SOURCE

SINK

R

OH

R

OL

Duty≧95%, OUT=0V

Duty≦5%, OUT=5V

OUT = -15mA - 18 30

OUT = 15mA - 16 25

- -130 -80 mA

65 100 - mA

Ω

Ω

Output block (CH1 to CH3) [Pin 40,42,47]

Output source current I

Output sink current I

Output ON resistor

SOURCE

SINK

R

OH

R

OL

Duty≧95%, OUT=0V

Duty≦5%, OUT=5V

OUT = -15mA - 18 30

OUT = 15mA - 16 25

- -130 -80 mA

65 100 - mA

Ω

Ω

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

6

AT1382A

yp

4-Channel DC-DC Converter for DSC

Parameter Symbol Condition

Measure result

Min. T

Max.

Unit

Output block (CH4) [Pin 48]

Output source current I

Output sink current I

Output ON resistor

SOURCE

SINK

R

OH

R

OL

Duty≧95%, OUT=0V

Duty≦5%, OUT=5V

OUT = -15mA - 9 15

OUT = 15mA - 9 15

- -260 -160 mA

150 260 - mA

Ω

Ω

Control block [CTL]

V

Active mode 1.3 - 7 V

CTL input voltage

CTL1 to CTL4 input voltage

Input current I

IH

V

Standby mode 0 - 0.8 V

IL

V

Active mode 1.3 - 7 V

IH

V

Standby mode 0 - 0.8 V

IL

CTL = 5V - 5 20

CTL

μA

Analog gain block [AO,AI]

AI feedback regulation voltage VAO=V

-1.22V 1.20 1.22 1.24 V

OUT

AI input common-mode range -0.1 - 1.3 V

AI input current VAI=1.32V - - 100 nA

AI to AO voltage gain 70 100 140 V/V

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

ENLD enable V

ENLD disable V

Active mode 1.2 - 7 V

IH

Standby mode 0 - 0.8 V

IL

Low battery detect block [LBI, LBO]

LBI detect threshold 1.20 1.22 1.24 V

Detect Hysteresis -50 +50 mV

LBO output voltage low Isink=1mA - - 0.4 V

LBO output high leakage

LBO

=5V

-0.011

μA

V

General

Standby current

Icss CTL=0V - - 10

Icss(o) CTL=0V - - 10

μA

μA

CTL=CTL1=CTL2=C

Power supply current Icc

TL3=CTL4=ENLD="

-36mA

H"

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

7

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

8

AT1382A

4-Channel DC-DC Converter for DSC

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

9

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

10

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

11

AT1382A

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 Channel on / off state

CT L CLT1 C LT2 C LT3 CLT 4 CH 1 CH2 C H3 C H4

L X X X X OFF (Standby state)

L

H

H

X：Undefined

L

H

L

H

H

H

H

H

LOFFL
H

OFF
LOFF
H
LOFFL
H

OFF

ON
LOFF
H
LOFFL
H

OFF
LOFF
H
LOFFL
H

ON

ON
LOFF
H

OFF

ON

ON

ON

OFF

ON

ON

ON

OFF

ON

ON

ON

OFF

ON

ON

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 C
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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

12

which connected to the CSCP pin until

SCP

AT1382A

4-Channel DC-DC Converter for DSC

Soft Start Operation

4.

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

13

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

14

AT1382A

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 * C

(μF)

S

Ts

−

)(

×

CsR

eV

CS

= KR

The soft start function of CH1 to CH4 are the same. It could be disabled soft start function by
floating CS pin.

−×=

×

6.1176.33

6.1176.33

+

)1(7.0

Ω

6. Setting the output voltage

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

15

AT1382A

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 C
below equation.

t

(s): Short detection time

PE

to be charged at 1.0μA. The time period of short circuit protection as show

SCP

When the C

(s) = 0.7 * C

t

PE

is charged to the 0.7V, the timer-latch is set and output is turn off (dead time is set to 100

SCP

SCP

(μF)

﹪). 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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

16

AT1382A

﹪

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 (R

) connected to the RT terminal.

T

1000000

)()(

Ω×

kRPFC

TT

OSC

)(

=

kHzf

9. 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).

−

VxVd

max)( ×

ONDUTY

If don't setting maximum duty, connect DTC terminal directly to the VREF terminal.

=

V

∆

100

1

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

17

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

18

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

19

AT1382A

4-Channel DC-DC Converter for DSC

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

20

AT1382A

4-Channel DC-DC Converter for DSC

*if VCC=PVCC=3.3V, the efficiency will decrease about 0.2~05 % because of the N-

MOSFET AO3400 Rds(on) increase.

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

21

AT1382A

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: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

22

AT1382A

4-Channel DC-DC Converter for DSC

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

23

AT1382A

4-Channel DC-DC Converter for DSC

Typical Characteristics

LQFP48

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

24

AT1382A

C

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. 10°C/second max.
Preheat Temperature(125±20°C)
Temperature maintained above 180°C
Time within 5°C of actual Peak

Temperature
Peak Temperature Range(Note 1)

Cooling Rate
Time 25°C to Peak Temperature

*1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions.

120 seconds max.
10~150 seconds
10~20 seconds 60 seconds

219~225°C or
235~240°C
6°C /second max. 10°C/second max.
6 minutes max.

219~225°C or
235~240°C

Package Reflow Conditions

Pkg. Thickness ≥2.5mm
and all bags

Convection 219~225
VPR 219~225

°C

IR/Convection 219~225

°C

°C

Pkg. Thickness <2.5mm
and

Pkg. Volume ≥350 mm

Pkg. Thickness <2.5mm
and

3

Pkg. Volume <350 mm

Convection 235~240
VPR 235~240
IR/Convection 235~240

VPR

3

°C

°C

°

2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone] WWW: http://www.aimtron.com.tw
Fax: [phone] Email: [e-mail]

25