AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Features
• Low start-up power supply voltage :1.4V(CH5)
• Wide supply voltage range from 2.5V to 7V
(CH1~5)
• High speed operation is possible: Maximum
1 MHz
• Supports for up,down, flyback and up/down
SEPIC conversion
• Supports for inverting conversion (CH4)
• Synchronized rectification on CH1,CH2
• Selectable P-Ch/N-CH MOSFETdriver
• Built-in On/Off function
• Built-in Short-Circuit Protection.
General Description
The AT1395 is a 5-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,
inverting conversion (CH4 only) and up/down
conversion (using a step-up/step-down SEPIC or
Zeta system with free input and output settings). 5
channels can be built in the LQFP48 package, each
channel be controlled, and soft-start.
The AT1395 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.)
Applications
• Digital Cameras
• CCD Imaging Devices
• Camcorders
Pin Assignment
Ordering Information
Part number
AT1395F
Package
LQFP48
Marking
AT1395F
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
AT1395
Preliminary Product Information
5-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
SS5
FB5
IN5E
SEL4
DTC4
SS4
FB4
IN4N
IN4P
SEL3
DTC3
SS3
FB3
IN3E
CTL5
CTL4
CTL3
VREG
VREFO
AGND
VCC
VBC
CT
CTL
CSCP
CTL2
CTL1
IN2E
FB2
SS2
DTC2
SEL2
IN1E
FB1
SS1
DTC1
SEL1
LBI
LBO
OUT1_1
OUT1_2
OUT2_1
OUT2_2
PVCC
PGND
OUT3
OUT4
OUT5
I/O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
O
-
P
P
-
-
I
-
I
I
I
I
I
I
I
I
I
I
I
I
I
O
O
O
O
O
P
P
O
O
O
Function
CH5 Soft Start Setting Capacitor
CH5 Error Amplifier Output
CH5 Error Amplifier Inverted Input
CH4 Output Driver P-ch/N-ch Control
CH4 Dead Time Control
CH4 Soft Start Setting Capacitor
CH4 Error Amplifier Output
CH4 Error Amplifier Negative Input
CH4 Error Amplifier Positive Input
CH3 Output Driver P-ch/N-ch Control
CH3 Dead Time Control
CH3 Soft Start Setting Capacitor
CH3 Error Amplifier Output
CH3 Error Amplifier Inverted Input
CH5 ON/OFF Control Input
CH4 ON/OFF Control Input
CH3 ON/OFF Control Input
2.2V Regulator Output
Reference bypass Input
Power Ground
Power Supply
Bias bypass Input
Oscillation Frequency Setting Capacitor
Power Control Input
Timer Latch Short-Circuit Detection Capacitor Input
CH2 ON/OFF Control Input
CH1 ON/OFF Control Input
CH2 Error Amplifier Inverted Input
CH2 Error Amplifier Output
CH2 Soft Start Setting Capacitor
CH2 Dead Time Control
CH2 Output Driver P-ch/N-ch Control
CH1 Error Amplifier Inverted Input
CH1 Error Amplifier Output
CH1 Soft Start Setting Capacitor
CH1 Dead Time Control
CH1 Output Driver P-ch/N-ch Control
Low Battery Detector Input
Low Battery Indicator
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
CH5 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
AT1395
Preliminary Product Information
5-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
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Absolute Maximum Ratings
Parameter
Power supply voltage
Output current
Output peak current
Power dissipation
Operation temperature
Storage temperature
exceed these ratings.
Symbol
Vcc
Io
Io
P
D
Topr
Tstg
Condition
--
Output pin
Output pin, Duty≦5%
Ta
≦
25℃ (LQFP-48P)
--
--
Rating
Min
Max
--
--
--
--
-30
-55
7
20
200
860
85
125
Unit
V
mA
mA
mW
℃
℃
*
Semiconductor devices can be permanently damaged by application of stress in excess of absolute ratings. Do not
Recommended Operating Conditions
Value
Parameter
Startup power supply voltage
Power supply voltage
Regulator voltage output current
Input voltage
Control input voltage
Output current
Oscillator
Timing capacitor
Soft start capacitor
Short detection capacitor
VREG pin capacitor
Operating ambient temperature
Symbol
Vcc1
Vcc2
I
OR
V
IN
V
CTL
Io
f
OSC
C
T
Cs
C
SS6
C
CSCP
C
VREG
TA
CH5
CH5
Condition
Min
1.4
2.5
-10
0
0
--
1
100
47
--
--
--
--
--
--
0.082
-30
CH1 to CH4
VREG pin
IN1E to IN5E pins
CTL pin
OUT pin (CH1 to CH4)
OUT pin (CH5)
--
--
CH1 to CH4
Unit
Typ
--
3.3
--
--
--
2
2
500
100
0.1
0.1
0.1
0.1
25
Max
6.5
6.5
0
Vcc-1.8
7
15
15
1000
560
1.0
1.0
1.0
--
85
V
V
mA
V
V
mA
mA
kHz
pF
μF
μF
μF
μF
℃
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
AT1395
Preliminary Product Information
5-Channel DC-DC Converter for DSC
Electrical Characteristics
(TA=25℃, VCC=PVCC=5V)
Parameter
Reference voltage block [REF]
Regulator voltage
Output voltage temperature
stability
Input stability
Load stability
Threshold voltage(CH1~CH4)
Hysteresis width(CH1~CH4)
Reset voltage(CH1~CH4)
CH5 Pre-OSC change to Main-
OSC threshold
Pre-OSC frequency(CH6)
Soft start block [CS]
Charge current
Symbol
V
REG
Condition
Measure result
Unit
Min. Typ. Max.
2.15
-
-10
-10
2.0
0.05
-
-
320
2.2
0.5
-
-
2.2
0.1
-
1.8
400
2.25
-
10
10
2.4
0.3
2.5
-
450
V
%
mV
mV
V
V
V
V
KHz
△V
REG
TA = -30℃ to 85℃
/V
REG
Line
Load
V
TH
V
H
V
RST
V
TH
f
Pre-OSC
VCC=2.5V to 7V
VREG=0mA to –1mA
Under voltage lockout block [U.V.L.O]
I
CS
V
TH
V
STB
V
I
I
CSCP
-3.0
0.65
-
-
-1.4
-2.5
0.70
50
50
-1.0
-2.0
0.75
100
100
-0.6
μA
Short circuit detection block [SCP]
Threshold voltage
Input standby voltage
Input latch voltage
Input source current
V
mV
mV
μA
Triangular wave oscillator block [OSC]
Oscillator frequency
Frequency stability for voltage
Frequency stability for
temperature
CH5 Maximum Duty
f
OSC
△f
/fdv
△f
/fdt
DUTY
CT=75pF
VCC=2.5V to 7V
TA=-30℃ to 85℃
450
-
-
500
1
1
550
10
20
kHz
%
%
80
90
-
%
Error amplifier block [Error Amp](CH1~CH5)
Threshold voltage
V
REF
FB=1.22V
1.20
1.22
1.24
V
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
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