AT1396A-GRE [GMT]
Analog Circuit,;
| 型号： | AT1396A-GRE |
| 厂家： | 
GLOBAL MIXED-MODE TECHNOLOGY INC |
| 描述： | Analog Circuit, |
| 文件： | 总25页 (文件大小：744K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Features
General Description
• 95% Efficient possible DC/DC Converter
• Combine Step-Up and Step-Down for
90% Efficient Boost-Buck
• Bulit-in LED Driver and Open LED
Overvoltage Protection
• Transformerless Inverting Controller for CCD
Bias
• 2 Channel Built-in MOSFET Current- Mode
PWM and 4 Channel Extra PWM Controllers
(CH-3 Synchronous Output)
The AT1396A/B/C/D provide a complete
power supply solution for digital cameras. They
improve performance, component count, and size
compared to other multi-channel controllers in
2-cell AA, 1-cell Li-Ion, and dual-battery designs.
On-chip MOSFETs provide up to 92~95%
efficiency for critical power supplies, while
additional channels operate with external FETs for
optimum design flexibility. All channels DC/DC
operate at one fixed frequency settable from
100KHz to 1MHz to optimize size, cost, and
efficiency.
• Up to 1MHz Operating Frequency
• Shutdown Current <1uA
• Built-in Soft-Start Function
• Built-in Short-Circuit Protection Function
• QFN48 Package
Applications
• DSC Power Supply
Pin Assignment
Ordering Information
Part Number
Package
Marking
QFN48,Green
AT1396 N_GRE
：
A:1396AN B:1396BN C:1396CN D:1396DN
： Date Code
*For more marking information, contact our sales representative directly.
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Block Diagram
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Pin Description
Symbol
Pin No.
Descript
SS1
CTL5
CTL6
LXU
CTLU
PGND1
PGND2
CTLD
LXD
CTL3
CTL4
SS2
/SDOK
CSCP
PVCC2
COMP2
FBD
1
2
3
4
5
6
7
8
CH1 Soft-Start Input
CH5 Enable Input
CH6 Enable Input
Step-Up Converter Switching Node
CH1 Enable and Chip Enable Input
Power Ground
Power Ground
CH2 Enable Input
9
Step-Down Converter Switching Node
CH3 Enable Input
CH4 Enable Input
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
CH2 Soft-Start Input
Open-Drain, Active Low, Power Good for Step-Down
Short Circuit Protection Input
Step-Down Converter Input
Step-Down Converter Compensation Node
Step-Down Converter Feedback Input
CH3 Soft-Start Input
CH3 Compensation Node
CH3 Feedback Input
CH4 Soft-Start Input
CH4 Compensation Node
CH4 Negative Feedback Input
CH4 Positive Feedback Input
CH3 Power
CH3 Master Output Driver
CH3 Slave Output Driver
Power Ground
SS3
COMP3
FB3
SS4
COMP4
IN4
IP4
PVCC3
OUT3M
OUT3S
PGND3
OUT4
OUT5
OUT6
PVCC4
GND
FB5H
FB5
COMP5
VBG
SS5
FB6
COMP6
CT
VREG
FBU
CH4 Output Driver
CH5 Output Driver
CH6 Output Driver
CH4 Power
Power Ground
CH5 Controller Voltage Feedback Input
CH5 Controller Voltage Feedback/Current Feedback
CH5 Compensation Node
Reference Bypass
CH5 Soft-Start Input
CH6 Feedback input
CH6 Compensation Node
Oscillator Control
Reference Output
Step-Up Converter Input
Step-Up Controller Compensation Node
IC power Input
Power Output of the Step-Up Converter
CH6 Soft-Start Input
COMP1
VCC
PVCC1
SS6
SEL4
Configures the CH4 as a Step-Up or Step-Down
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
3
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Absolute Maximum Ratings*1
Parameter
Rated Value
Symbol
Units
Min. Max.
Storage Temperature
TSTG
TOPR
-55
150
85
℃
℃
V
Operating Temperature TA
PVCC1,PVCC2,PVCC3,PVCC4 Input Voltage
LXU,LXD, OUT3M,OUT3S Input Voltage
Other Input Pin
-35
-0.3
6.0
6.0
6.0
3.6
2.25
200
2
-
VLX/OUT
-0.3
V
-
-0.3
V
LXU Current
-
-
-
-
-
-
-
-
A
LXD Current
A
OUT3M,OUT3S Current
-
mA
KV
V
HBM
MM
Pd
ESD Susceptibility*2
200
1000
Power Consumption
mW
1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect device reliability.
2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF
capacitor discharged through a 1.5KΩ resistor into each pin.
Recommended Operating Conditions
(Ta=+250C)
Value
Parameter
Symbol
Unit
Min
2.5
2.5
0
Typ
--
Max
5.5
Startup power supply voltage
Power supply voltage
Vcc
PVCC
VIN
V
V
--
5.5
Feedback input voltage
Control input voltage
--
Vcc-2
Vcc
1.0
V
VCTL
CSS
0
--
V
Soft start capacitor
--
0.1
0.1
0.1
25
µF
µF
µF
℃
Short Circuit Protection Capacitor
VREG pin capacitor
CSCP
CVREG
--
1.0
0.082
-20
--
T
A
Operating ambient temperature*
85
*Using X5R or X7R input capacitors.
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
4
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Electrical Characteristics
(PVCC1=PVCC2=PVCC3=PVCC4=VCC=3.6V, Ta=+250C)
Values
Parameter
Symbol
Condition
Unit
Min. Typ. Max.
GENERAL
Input Voltage Range
VCC Channel 1 DC/DC
No Switching,
1.5
-
-
5.5
1.4
V
CH1,CH2
Switch- Off Input Current
FBU=FBD=0.9V
IVCC
1.3
mA
CTLU=CTLD=3.6V,other
disable
No Switching,
CH1,CH2, CH3(or 4,5,6)
Switch- Off Input Current
FBU=FBD=FB3=0.9V
CTLU=CTLD=CTL3=3.6V
other disable
IVCC
-
-
1.5
1
1.6
10
mA
µA
Shutdown Current
IVCC All CTL disable
REFERENCE
Reference Output Voltage
VREG IREG =1mA
2.25
2.30
2.35
10
5
V
Reference Load
Regulation
1mA< IREG <5mA
2.5<VCC<5.5V
-
-
5
-
mV
mV
∆VREG1
∆VREG2
Reference Line Regulation
OSC
Frequency
fOSC CT=82pF
-
-
-
500
1
-
10
5
KHz
%
Frequency variation with
Temperature
Frequency variation with
Input Voltage
T =-20°C ~+85°C
∆fOSC1
∆fOSC2
a
VCC =2.5V~5.5V
1
%
CHANNEL 1(STEP-UP)
Pre-OSC to OSC Trip
Level
VCC1 VCC rising edge
∆VCC1
-
2.45
100
2.45
-
-
-
V
mV
V
Pre-OSC to OSC
Hysteresis
-
Under Voltage Lockout
Input Voltage Range
VCC
-
1.5
0.7
0.784
-
-
PVCC1 Channel 1 DC/DC
5.5
1.3
0.816
100
-
V
Normal Operating
Soft-Start Charge Current
ISS1
VCC =2.5V~5.5V
1
µA
V
T =-20°C ~+85°C
a
FBU Regulation Voltage
FBU input Current
VFBU
0.8
-
IFBU FBU=0.8V
RCS
nA
V/A
Current-Sense Amplifier
Transresistance
-
0.285
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Transconductance
GMEA
-
85
-
140
90
-
95
12
5
µs
%
Maximum Duty Cycle
PVCC1 Leakage Current
LX Leakage Current
DMAX FBU=0.7V
V
V
=0V,PVCC1=5.5V
=5.5V
IL1
ILX1
RN
5
µA
µA
mΩ
mΩ
A
LXU
LXU
-
1
N-Channel
P-Channel
-
95
150
250
2.4
-
Switch On-Resistance
RP
-
150
2.1
20
N-Channel Current Limit
ILimit1
IREV1
1.8
-
P-Channel Turn-off
Current
mA
mA
KHz
Startup Current Limit
Startup Frequency
ILimit-s PVCC1=1.5V
fSTART PVCC1=1.5V
-
450
200
-
-
-
CHANNEL 2(STEP-DOWN)
Input Voltage Range
PVCC2 Channel 2 DC/DC
2.5
-
1
5.5
1.3
0.816
100
-
V
µA
V
Normal Operating
Soft-Start Charge Current
ISS2
VCC =2.5V~5.5V
0.7
T =-20°C ~+85°C
a
FBD Regulation Voltage
FBD input Current
VFBD
0.784
0.8
-
IFBD FBD=0.8V
RCS
-
-
nA
V/A
µs
Current-Sense Amplifier
Transresistance
0.6
140
100
1
Transconductance
GMEA
-
-
Maximum Duty Cycle
LX Leakage Current
DMAX FBD=0.7V
-
-
%
V
=0~3.6V,PVCC2=3.6V
ILX2
RN
-
5
µA
mΩ
mΩ
A
LX
N-Channel
P-Channel
-
200
250
1.2
20
250
350
1.4
-
Switch On-Resistance
RP
-
P-Channel Current Limit
ILimit2
IREV2
1.0
-
N-Channel Turn-off
Current
mA
V
/SDOK Output Low
Voltage
VSDOK 0.1mA into /SDOK
-
0.01
0.1
0.1
1
/SDOK Leakage current
IL_SDOK CTLD=0V,/SDOK=5.5V
-
µA
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
CHANNEL 3
Input Voltage Range
PVCC3 Channel 3 DC/DC
2.5
-
1
5.5
V
µA
nA
V
Normal Operating
Soft-Start Charge Current
ISS3
IFB3
VFB3
AV
VCC =2.5V~5.5V
FB3=0.8V
0.7
1.3
FB3 input Current
-
-
100
T =-20°C ~+85°C,
a
FB3 Regulation Voltage
0.784
0.8
-
0.816
FB3=COMP3
Error Amplifier Voltage
Gain
DC
80
-
-
-
dB
MHz
V
Error Amplifier Frequency
Bandwidth
BW AV=0dB
5
V
-
1.0
10
-0.5
60
-130
100
18
16
90
100
-
OH
Error Amplifier Output
Voltage
V
-
-
mV
mA
µA
mA
mA
Ω
OL
Isource
COMP=0.8V
-
-
Error Amplifier Output
Source Current
Isink
Isource
Isink
COMP=0.8V
-
-
Output Source Current
Output Sink Current
DUTY=90%,OUT=1/2VCC
DUTY=0%,OUT=1/2VCC
OUT=-15mA
-
-80
-
65
-
ROH
ROL
30
25
95
-
Output On-Resistor
OUT=15mA
-
Ω
DMAX Step-Up Mode
85
-
%
Maximum Duty Cycle
DMAX Step-Down Mode
%
CHANNEL 4,5,6
Input Voltage Range
PVCC4 Channel 4,5,6 DC/DC
ISS4/5/6 VCC =2.5V~5.5V
2.5
0.7
-
1
5.5
1.3
0.816
0.21
1.02
-
V
µA
V
Normal Operating
Soft-Start Charge Current
T =-20°C ~+85°C,
FB_=COMP_
FB4/5/6 Regulation
Voltage
a
VFB4/5/6
0.784
0.19
0.98
80
0.8
0.20
1.00
-
T =-20°C ~+85°C,
FB5=COMP5
FB5 Regulation Voltage
for LED Driver
a
VFB5
V
T =-20°C ~+85°C,
FB5H OVP Trip Level
VFB5H
AV
V
a
Error Amplifier Voltage
Gain
DC
dB
MHz
Error Amplifier Frequency
Bandwidth
BW AV=0dB
-
5
-
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
V
-
-
1.0
10
-
-
V
mV
mA
µA
%
OH
Error Amplifier Output
Voltage
V
OL
Isource
Isink
COMP=0.8V
COMP=0.8V
-
-0.5
60
-
Error Amplifier Output
Source Current
-
-
DMAX FB_=0.7V
DMAX FB5=0.1V
85
85
-
90
95
95
-80
-
Maximum Duty Cycle
90
%
Isource
Isink
Output Source Current
Output Sink Current
DUTY=90%,OUT=1/2VCC
DUTY=0%,OUT=1/2VCC
OUT=-15mA
-130
100
18
mA
mA
Ω
65
-
ROH
ROL
30
25
Output On-Resistor
OUT=15mA
-
16
Ω
SHORT CIRCUIT PROTECTION
VTH
Threshold Voltage
CH3,CH4,CH5,CH6
-
0.9
1.0
-
V
ICSCP
CSCP Charge Current
CONTROL BLOCK
0.7
1.3
µA
VIH
VIL
VIH
VIL
VIH
VIL
VIH
VIL
VIH
VIL
PVCC1=VCC=1.5 ~5.5V
PVCC1=VCC=1.5 ~5.5V
1.1
0
-
-
-
-
-
-
-
-
-
-
VCC
0.5
V
V
V
V
V
V
V
V
V
V
CTLU input Voltage
CTLD input Voltage
CTL3 input Voltage
CTL4 , 5 , 6 input Voltage
SEL4 input Voltage
PVCC1 , 2=VCC=1.5 ~5.5V
CTLD=VIH
1.1
0
VCC
0.5
PVCC1 , 2=VCC=1.5 ~5.5V
CTLD=VIH
PVCC1 , 3=VCC=1.5 ~5.5V
CTLU=VIH
1.4
0
VCC
0.5
PVCC1 , 3=VCC=1.5 ~5.5V
CTLU=VIH
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=VIH
1.4
0
VCC
0.5
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=VIH
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=CTL4=VIH
1.4
0
VCC
0.5
PVCC1 , 4=VCC=1.5 ~5.5V
CTLU=CTL4=VIH
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics
CH2 Efficiency VS. Load Current
100
CH1 Efficiency VS. Load Current
100
90
80
70
60
50
90
80
70
V BA T=1.5V
V BA T=2.0V
V BA T=2.5V
V BA T=3.2V
V BA T=3.8V
V BA T=4.5V
V BA T=3.6V
V BA T=3.8V
V BA T=4.2V
60
V BA T=4.5V
Vout1=5.0V
Vout2=3.3V
50
10
100
1000
10
100
1000
Load Current(mA)
Load Current(mA)
CH2 Efficiency VS. Load Current
CH1 Efficiency VS. Load Current
100
90
80
70
60
50
100
90
80
70
60
50
V BA T=2.5V
V BA T=1.5V
V BA T=3.0V
V BA T=3.8V
V BA T=4.5V
V BA T=2.0V
V BA T=2.5V
V BA T=3.0V
Vout1=3.3V
Vout2=1.8V
10
100
1000
10
100
1000
Load Current(mA)
Load Current(mA)
CH1+CH2 Efficiency VS. Load Current
CH1+CH2 Efficiency VS. Load Current
100
90
80
70
60
50
100
90
80
70
60
50
Vout1=5.0V
Vout2=3.3V
Vout1=3.3V
Vout2=1.8V
V BA T=1.5V
V BA T=2.0V
V BA T=2.5V
V BA T=3.2V
V BA T=3.8V
V BA T=4.5V
V BA T=1.5V
V BA T=2.0V
V BA T=2.5V
V BA T=3.2V
10
100
1000
10
100
1000
Load Current(mA)
Load Current(mA)
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
9
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics ( Continued )
CH3 Efficiency VS. Load Current
CH4 , 5 , 6 Efficiency VS. Load Current
CH4 , 5 , 6 Efficiency VS. Load Current
CH4 Efficiency VS. Load Current
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
10
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics ( Continued )
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
11
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics ( Continued )
CH3 Start-Up Waveform
VBAT = 2.0V
Time : 20mS/Div
CTL3 , 2V/Div , DC
VM=3.3V , 2V/Div , DC
IoutM ,100mA/Div , DC
IBAT , 1A/Div , DC
CH3 Start-Up Waveform
VBAT = 3.0V
Time : 20mS/Div
CTL3 , 2V/Div , DC
VM=5.0V , 2V/Div , DC
IoutM , 100mA/Div , DC
IBAT , 1A/Div , DC
CH1,CH2,CH3 Start-Up Waveform
VBAT = 3.0V
Time : 50mS/Div
CTLU , 2V/Div , DC
VDSP_IO=3.3V , 2V/Div , DC
VDSP_Core=1.8V , 1V/Div , DC
VM=5V , 5V/Div , DC
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
12
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Characteristics ( Continued )
CH1 Load Transient Response
VBAT = 3.0V
Time : 1mS/Div
VM , 100mV/Div , AC
Iout1 , 200mA/Div , DC
CH2 Load Transient Response
VBAT = 2.0V
Time : 1mS/Div
VDSP_Core , 100mV , AC
Iout2 , 100mA/Div , DC
CH3 Load Transient Response
VBAT = 3.0V
Time : 1mS/Div
VDSP_IO , 100mV/Div , AC
Iout3 , 100mA/Div , DC
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
13
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Application Circuit ( Continued )
Multi-Battery Application
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14
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Application Circuit ( Continued )
2-AA Battery Application
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15
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Typical Application Circuit ( Continued )
1-Li Battery Application
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16
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Application Information
The AT1396A/B/C/D include 6 channels DC/DC to generate a multiple-output digital
camera power-supply system. It include:
z
z
z
Step-Up DC/DC converter with on-chip synchronous MOSFETs.(CH1)
Step-Down DC/DC converter with on-chip synchronous MOSFETs.(CH2)
Main synchronous DC/DC controller can be configured as either a Step-Up or
Step-Down converter.(CH3)
z
z
z
Selectable DC/DC controller for boost/flyback/buck/inverting converters.(CH4)
White LED driver with open LED protection or boost controller.(CH5)
Boost/flyback controller.(CH6)
Step-Up DC/DC Converter (CH1)
The step-up DC/DC converter typically is used to generate a 5V or the highest of the
DSC power system requirement from a 1.5V to 4.2V battery input and self-power the
AT1396. The efficiency is up to 95% with an internal MOSFET and external
synchronous rectifier.
Step-Down DC/DC Converter (CH2)
The step-down DC/DC is optimized for generating DSP core voltage (down to 0.8V)
at high efficiency. It runs from the voltage at PVCC2. This pin can be connected
directly to the battery if sufficient headroom exists to avoid dropout. It can be
powered from the output of another converter (CH1 or CH3) for boost-buck
operation.
The CH2 also features an open-drain /SDOK output that goes low when the CH2 is in
regulation. /SDOK may be used to drive an external P-MOSFET that gates 3.3V
power to the DSP after the core voltage is in regulation (Figure 1). The R1,R2 and C1
is for MOSFET soft-start function to avoid the more inrush current .
Step-Up or Step-Down DC/DC Converter (CH3)
The CH3 can be as a step-up (AT1396B/D) or step-down (AT1396A/C) voltage mode
PWM converter. An external MOSFET and synchronous rectifier allow conversion
efficiencies as high as 93%. Step-down operation can be direct from Li-Ion cell if the
minimum input voltage exceeds the desired output by approximately 200mV. When
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17
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
generating 3.3V from Li-Ion, boost-buck operation may be needed so a regulated
output can be maintained for input voltages above and below 3.3V. The efficiency is
best than SEPIC or ZETA structure. In this case, it may be configure the CH3 as a
step-down and connect its input PVCC3 to the CH1 output, set to a voltage at or
above 4.2V. The output efficiency with this topology is typically up to 90%. Note that
the step-up output (CH1) supplies both the step-up(CH1) load and the step-down
(CH2) input current when the CH3 is powered from the CH1. The CH3 input current
reduces the available step-up output (CH1) current for other loads.
Figure 1. Using /SDOK to drive external MOSFET that gates 3.3V power to DSP after 1.8V core voltage is in regulation
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
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18
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Auxiliary Controller (CH4,CH5,CH6)
The three auxiliary controllers operate as fixed-frequency voltage-mode PWM
controllers. They use the external MOSFETs, so output power is determined by
external components. All of auxiliary controllers have a guaranteed duty cycle of
minimum duty cycle of 85%(boost-type) or 100%(buck/inverting type). In boost
designs that employ continuous current (CCM), the maximum duty cycle limits the
boost ratio so:
VIN
1−
≤ 85%
VOUT
With discontinuous inductor current(DCM), no such limit exists for the input/output
ratio since the inductor has time to fully discharge before the next cycle begins. The
discontinuous conduction mode boost voltage conversion relationship is given by:
4 × D2
1+ 1+
K
D = K × M × (M − 1)
VO = Vi ×
2
Where K is defined as:
VO
M =
Vi
2 × L
K =
R ×TS
The CH4 is selectable DC/DC controller for drive N-channel MOSFETs (SEL=high)
or P-channel MOSFETs (SEL=low). It can be configure as the inverting circuit
(Figure 2), typically for CCD and LCD bias. This is useful in height-Limited designs
where transformers may not be desired. The efficiency is more than the charge-pump
inversion for some load conditions.
The CH5 can be configure as a switching-mode boost current source for white LEDs,
FB5(0.2V) provides current-sensing feedback, while FB5H(1.0V) provides (optional)
open-LED over-voltage protection(Figure 3). If used as a boost converter, FB5H is
grounded and FB5(0.8V) is used as the feedback input. In this case, CH5 behaves
exactly like CH4 and CH6.
The CH6 can be used for conventional DC/DC boost and flyback designs.(Figure
4 ,Figure 5 and Figure 6)
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19
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Figure 2. Regulated –7.5V negative CCD Bias.
Figure 3. LED Drive with open LED over-voltage protection
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20
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Figure 4. +15V and –7.5V CCD Bias with transformer
Figure 5. +15V and –7.5V CCD Bias with Charge-Pump Inversion
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21
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Figure 6. +15V and –7.5V CCD Bias with Charge-Pump (using AT1202 to regulated the negative output)
Soft-Start Setting (CH1~CH6)
The AT1396 all channels feature a soft-start function that limits inrush current and
prevents excessive battery loading at start-up by ramping the output voltage of each
channel up to the regulation voltage. Consider the input voltage and load current to
design the capacitor connected to the SS pin. It can calculate the CH1~6 soft start
time Ts(s)(valid threshold 0.3~0.8V interval).
∆V
∆t
C ×
= I
Ts(s) = 0.5× C(µF)
Note : It could be disabled soft start function by floating SS pin.
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22
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
SCP Protection Setting (CH3~CH6)
The CSCP comparator detects CH3,CH4,CH5 and CH6 output voltage while the
power converter work at normal condition. At the same time, the voltage level of
CSCP pin is held at low level. If the output load of these converters rapidly
malfunction or short, causing the output voltage to drop, the CSCP comparator detects
that to enable short circuit protection. The time period when short circuit protection
show as follow equation.
Short detection time (TPE(s))
TPE(s) = 0.9 * CCSCP (µF)
Note : It could be disabled short circuit protection function by connecting CSCP pin
into the ground.
Determine the triangular Oscillator Frequency
The triangular oscillator frequency is determined by the timing capacitor (CT). It is
difficult to incorporate these non-linear characteristics into the equation. This
difference is caused by characteristics, such as changes in the maximum voltage
amplitude of the sawtooth waveform with the CT value and the circuit delay causing
the maximum amplitude to become large in the case of a high oscillating frequency
even for the same capacitor. In practical use, therefore, the user should read the CT
values from the characteristic curve or should determine an approximate target value
by using the equation.
41000
fOSC (KHz) =
CT ( pF)
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23
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Package Outline: QFN48
7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
4/2/2007 REV:1.1
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24
AT1396A/B/C/D
Preliminary Product Information
6-Channel DC-DC Converter for DSC
Reflow Profiles
Sn-Pb Eutectic Assembly
Pb-Free Assembly
Large Body
Pkg. thickness
≥2.5mm or Pkg.
volume ≥350mm3
Large Body
Pkg. thickness
Small Body
Pkg. thickness
≥2.5mm or Pkg.
Small Body
Pkg. thickness
<2.5mm or Pkg.
volume <350mm3
Profile Feature
≥2.5mm or Pkg.
volume ≥350mm3 volume ≥350mm3
3°C/second max.
Average ramp-up rate
3°C/second max.
(T to T )
L
P
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
Tsmax to T
-Ramp-up Rate
L
-
3°C/second max.
Time maintained above:
-Temperature (T )
-Time (t )
L
L
183°C
60-150 seconds
217°C
60-150 seconds
Peak Temperature(T )
225+0/-5°C
10-30 seconds
240+0/-5°C
245+0/-5°C
250+0/-5°C
P
Time within 5°C of actual
10-30 seconds
10-30 seconds
20-40 seconds
Peak Temperature (t )
P
Ramp-down Rate
6°C/second max.
6 minutes max.
6°C/second max.
8 minutes max.
Time
25°C
to
Peak
Temperature
*All temperatures refer to topside of the package, measured on the package body surface.
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25
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