AT1388 - Aimtron Technology

AT1388

Preliminary Product Information

6-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

1

Features

• Low start-up power supply voltage :1.4V(CH6)

• Wide supply voltage range from 2.5V to 7V

(CH1~6)

• High speed operation is possible: Maximum

1 MHz

• Supports for up, flyback and up/down SEPIC

conversion (CH2,3,4,5,6)

• Supports for down and up/down Zeta conversion

(CH1)

• Synchronized rectification on CH1,CH2

• 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 AT1388 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,

and up/down conversion (using a step-up/step-

down SEPIC ,Zeta system with free input and

output settings). 6 channels can be built in the

LQFP48 package, each channel be controlled, and

soft-start.

The AT1388 include one comparator to generate

low-battery warning outputs. It also contains two

high efficiency topology by using synchronous

rectification PWM(It can be disable by floating

OUT1_2,OUT2_2.)

Pin Assignment

Ordering Information

Part number Package Marking

AT1388 LQFP48 AT1388F

Aimtron reserves the right without notice to change this circuitry and specifications.

AT1388

Preliminary Product Information

6-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

2

Pin Description

Pin No. Pin name I/O Function

1 SS6 I CH6 Soft Start Setting Capacitor

2 FB6 I CH6 Error Amplifier Output

3 IN6 I CH6 Error Amplifier Inverted Input

4 DTC5 I CH5 Dead Time Control

5 SS5 I CH5 Soft Start Setting Capacitor

6 FB5 I CH5 Error Amplifier Output

7 IN5N I CH5 Error Amplifier Negative Input

8 IN5P I CH5 Error Amplifier Positive Input

9 DTC4 I CH4 Dead Time Control

10 SS4 I CH4 Soft Start Setting Capacitor

11 FB4 I CH4 Error Amplifier Output

12 IN4 I CH4 Error Amplifier Inverted Input

13 DTC3 I CH3 Dead Time Control

14 SS3 I CH3 Soft Start Setting Capacitor

15 FB3 I CH3 Error Amplifier Output

16 IN3 I CH3 Error Amplifier Inverted Input

17 CTL6 I CH6 ON/OFF Control Input

18 CTL5 I CH5 ON/OFF Control Input

19 VREG O 2.3V Regulator Output

20 AGND P Power Ground

21 VCC P Power Supply

22 CTL4 I CH4 ON/OFF Control Input

23 CT - Oscillation Frequency Setting Capacitor

24 CTL I Power Control Input

25 CSCP - Timer Latch Short-Circuit Detection Capacitor Input

26 CTL3 I CH3 ON/OFF Control Input

27 CTL2 I CH2 ON/OFF Control Input

28 CTL1 I CH1 ON/OFF Control Input

29 IN2 I CH2 Error Amplifier Inverted Input

30 FB2 I CH2 Error Amplifier Output

31 SS2 I CH2 Soft Start Setting Capacitor

32 DTC2 I CH2 Dead Time Control

33 IN1 I CH1 Error Amplifier Inverted Input

34 FB1 I CH1 Error Amplifier Output

35 SS1 I CH1 Soft Start Setting Capacitor

36 DTC1 I CH1 Dead Time Control

37 LBI I Low Battery Detector Input

38 LBO O Low Battery Indicator

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 PVCC P Drive Output Block Power Supply

44 PGND P Drive Output Block Ground

45 OUT3 O CH3 Output

46 OUT4 O CH4 Output

47 OUT5 O CH5 Output

48 OUT6 O CH6 Output

AT1388

Preliminary Product Information

6-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

3

Block Diagram

AT1388

Preliminary Product Information

6-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

4

Absolute Maximum Ratings

Ratin

g

Parameter Symbol Condition Min Max Unit

Power supply voltage Vcc -- -- 8 V

Output current Io Output pin -- 20 mA

Output peak current Io Output pin, Duty≦5% -- 200 mA

Power dissipation PDTa≦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

Min T

yp

Max

Unit

Startup power supply voltage Vcc CH6 1.4 -- 7 V

Power supply voltage Vcc CH1 to CH6 2.5 5.0 7 V

Regulator voltage output current IOR VREG pin -10 -- 0 mA

Input voltage VIN IN1 to IN6 pins 0 -- Vcc-1.8 V

Control input voltage VCTL CTL pin 0 -- 7 V

OUT pin (CH1 to CH5) -- 2 15 mA

Output current Io OUT pin (CH6) 1 2 15 mA

Oscillator fOSC -- 100 500 1000 kHz

Timing capacitor CT-- 47 82 560 pF

Cs CH1 to CH5 -- 0.1 1.0 μF

Soft start capacitor CSS6 CH6 -- 0.1 1.0 μF

Short detection capacitor CCSCP -- -- 0.1 1.0 μF

VREG pin capacitor CVREG -- 0.082 0.1 -- μF

Operating ambient temperature TA-- -30 25 85 ℃

AT1388

Preliminary Product Information

6-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

5

Electrical Characteristics

(TA=25℃, VCC=PVCC=5V)

Measure result

Parameter Symbol Condition Min. T

yp

. Max. Unit

Reference voltage block [REF]

Regulator voltage VREG 2.2 2.3 2.4 V

Output voltage temperature

stability

△VREF

/VREF

TA = -30℃ to 85℃-0.5-%

Input stability Line VCC=2.5V to 7V -10 - 10 mV

Load stability Load VREG=0mA to –10mA -10 - 10 mV

Short circuit output current IOSC VREG=2.0V - - -100 mA

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

Threshold voltage(CH1~CH5) VTH 2.0 2.2 2.4 V

CH6 Pre-OSC change to Main-

OSC threshold VTH2 -2.5-V

Hysteresis width(CH1~CH5) VH-0.2-V

Soft start block [CS]

Input standby voltage VSTB -50100mV

Charge current ICS -1.5 -1.0 -0.8 μA

Short circuit detection block [SCP]

Threshold voltage VTH 0.65 0.70 0.75 V

Input standby voltage VSTB -50100mV

Input latch voltage VI-50100mV

Input source current ICSCP -1.4 -1.0 -0.6 μA

Triangular wave oscillator block [OSC]

Oscillator frequency fOSC CT=82pF 450 500 550 kHz

Frequency stability for voltage △f

/fdv VCC=2.5V to 7V - 1 10 %

Frequency stability for

temperature

△f

/fdt TA=-30℃ to 85℃-1-%

Error amplifier block [Error Amp](CH1~CH5)

Threshold voltage VTH FB=0.7V 0.68 0.70 0.72 V

VT temperature stability △VT/VTTA = -30℃ to 85℃-0.5-%

Input bias current IBIN=0V -320 -80 - nA

AT1388

Preliminary Product Information

6-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

6

Voltage gain AVDC - 100 - dB

Frequency bandwidth BW AV=0dB - 10 - MHz

VOH 1.0 1.2 - V

Output voltage VOL -50200mV

Output source current ISOURCE FB=0.5V - -4.0 -1.0 mA

Output sink current ISINK FB=0.5V 70 140 - μA

Short detect comparator [SCP Comp]

Threshold voltage VTH CH1 to CH4 0.65 0.7 0.75 V

Input bias current IBIN=0V -320 -80 - nA

PWM Comp. [PWM Comp]

VT0 Duty = 0 % 0.25 0.3 - V

Threshold voltage(CH1~6)

VTmax Duty = 100 % - 0.80 0.85 V

Input current IDTC DTC=0.5V -1.0 -0.3 - μA

Output block (CH1 to CH5) [Pin 39,41,45,46,47]

Output source current ISOURCE Duty≧95%, OUT=0V - -130 -80 mA

Output sink current ISINK Duty≦5%, OUT=5V 65 100 - mA

ROH OUT = -15mA - 18 30 Ω

Output ON resistor

ROL OUT = 15mA - 16 25 Ω

Output block (CH1,2 ) [Pin 40,42]

Output source current ISOURCE Duty≧95%, OUT=0V - -130 -80 mA

Output sink current ISINK Duty≦5%, OUT=5V 65 100 - mA

ROH OUT = -15mA - 18 30 Ω

Output ON resistor

ROL OUT = 15mA - 16 25 Ω

Output block (CH6) [Pin 48]

Output source current ISOURCE Duty≧95%, OUT=0V - -260 -160 mA

Output sink current ISINK Duty≦5%, OUT=5V 150 260 - mA

ROH OUT = -15mA - 9 15 Ω

Output ON resistor ROL OUT = 15mA - 9 15 Ω

Control block [CTL]

VIH Active mode 1.3 - 7 V

CTL input voltage VIL Standby mode 0 - 0.7 V

VIH Active mode 1.3 - 7 V

CTL1 to CTL6 input voltage VIL Standby mode 0 - 0.7 V

Input current ICTL CTL = 5V - 5 20 μA

AT1388

Preliminary Product Information

6-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

7

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 VLBO=5V -0.011

μA

General(Output no Load)

Icss

CTL=CTL1=CTL2=CTL

3=CTL4=CTL5=CTL6=0

V

-110

μA

Standby current

Icss(o)

CTL=0V,

CTL1=CTL2=CTL3=CT

L4=CTL5=CTL6="H"

-200250

μA

Power supply current Icc1

CTL=CTL1=CTL2=CTL

3=CTL4=CTL5=CTL6="

H"

-57mA

Power supply current Icc2

CTL=”H”

CTL1=CTL2=CTL3=CT

L4=CTL5=CTL6="L"

-22.5mA

AT1388

Preliminary Product Information

6-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

8

Application Circuit

AT1388

Preliminary Product Information

6-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

AT1388

Preliminary Product Information

6-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

10

AT1388

Preliminary Product Information

6-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

11

Package Outline

LQFP48

AT1388

Preliminary Product Information

6-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

12

Reflow Condition (IR/Convection or VPR Reflow)

Reference JEDEC Standard J-STD-020A

Classification Reflow Profiles

Convection or

IR/Convction

VPR

Average Heating Rate(180°C to peak) 5°C/second max. 10°C/second max.

Preheat Temperature(125±20°C) 120 seconds max.

Temperature maintained above 180°C10~150 seconds

Time within 5°C of actual Peak

Temperature

10~20 seconds 60 seconds

Peak Temperature Range(Note 1) 219~225°C or

235~240°C

219~225°C or

235~240°C

Cooling Rate 6°C /second max. 10°C/second max.

Time 25°C to Peak Temperature 6 minutes max.

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

Package Reflow Conditions

Pkg. Thickness ≥2.5mm

and all bags

Pkg. Thickness <2.5mm

and

Pkg. Volume ≥350 mm3

Pkg. Thickness <2.5mm

and

Pkg. Volume <350 mm3

Convection 219~225°C Convection 235~240°C

VPR 219~225°C VPR 235~240°C

IR/Convection 219~225°C IR/Convection 235~240°C