AT1368B [ETC]
1- Channel Synchronous Buck PWM Controller with Power Good Reset; 1-通道同步降压PWM控制器，带有电源良好复位
| 型号： | AT1368B |
| 厂家： | 
ETC |
| 描述： | 1- Channel Synchronous Buck PWM Controller with Power Good Reset |
| 文件： | 总13页 (文件大小：549K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Features
General Description
• High efficiency (min. 90% On I =300mA
O
~600mA)
The AT1368 provides complete control and
protection for a DC/DC converter optimized for
high-performance microprocessor applications. It
is designed to drive one P-Channel and one N-
Channel MOSFETs in a synchronous-rectified
buck topology. The AT1368 integrates all of the
control, output adjustment, monitoring and
protection functions into a single package. The
output voltage of the converter can be precisely
regulated with a maximum tolerance of ±2% over
temperature and line voltage variations. The
AT1368 is a family of low-noise synchronous step-
down DC/DC converters that is ideally suited for
systems powered from a 1-cell Li-ion battery or
from a 3-cell to 4-cell NiCd, NiMH, or alkaline
battery. It can also be used to USB-Based power
system.
• Using external P and N channel MOSFET
• Supports for down and up/down Zeta
conversion
• Maximum Duty 100%
• Oscillation frequency 300KHz or 600KHz
• Soft Start by an external capacity
• Output voltage accuracy ±2%
• Built-in ON/OFF Function
• Built-in Short-circuit Protection
• Stand-by current max. 10µA
• Quiescent Current 1mA
• Monitor the input voltage and 3V3 output
• Input voltage: 2.5V ~7.0V
Applications
• Slim-Type CD-ROM/DVD-ROM/CD-RW
• Power Supply for portable devices
• Main or Sub Power source foe notebook
computers and peripherals.
Block Diagram
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Pin Configuration
Ordering Information
Part number
AT1368A
AT1368B
Package
SSOP16
SSOP16
TSSOP16
Marking
AT1368AR
AT1368BR
AT1368BP
AT1368B
A: fosc =300KHz B: fosc =600KHz
Pin Description
Symbol Pin No.
Descript
Symbol
Pin
Descript
No.(A/B)
FB
1
Inverting input to error SCP
9
Short-Circuit protection
amplifier
COMP
PVCC
2
3
Error amplifier output
Power blocks power
supply
CTL
NC
10
11
Chip enable, high active
-
PDRV
4
Output for Pch-MOSFET
IN1
12
VCC monitor voltage
adjustable input pin
Power Good indicator
3V3 output monitor
adjustable input pin
Sotf-start
NDRV
PGND
5
6
Output for Nch-MOSFET RESET
13
14
Power blocks ground
IN2
GND
VCC
7
8
Control blocks ground
Control blocks power
supply
SS
15
16
3V3
Output voltage 3.3V
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Absolute Maximum Ratings
Parameter
Condition
Rated Value
Unit
Min.
Max.
Power Supply Voltage
Source Average Current of PDRV,
NDRV
—
—
-
+8
V
-
-50
mA
Sink Average Current of PDRV,
NDRV
—
—
—
—
-
-
-
50
mA
mA
mA
Source Peak Current of PDRV,
NDRV
-200
200
Sink Peak Current of PDRV,
NDRV
Input Voltage to Error Amplifier
-
-
-30
-55
6.5
560
+85
+125
V
Continuous power dissipation
mW
SSOP16（T =+25℃）
a
Operating temperature
Storage temperature
—
0C
—
0C
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.
Recommended Operating Conditions
(Ta=+250C)
Parameter
Symbol
Values
Typ.
Unit
Min.
Max.
Power supply voltage
Control input voltage
Operating temperature
VCC
VCTL
TOP
2.5
--
7
Ｖ
V
°C
0
--
7
-20
+25
+85
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
3
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Electrical Characteristics
(VCC = 5V,T =+25℃ , unless otherwise noted. )
a
Parameter
Symbol
Condition
Values
Unit
Min. Typ. Max.
Input Supply Range
VCC
ICC
2.5
--
7.0
V
Duty=50%,
=600KHz
f
Quiescent Current
1.0 1.5 mA
OSC
PDRV/NDRV No Load
CTL=0V
Current in standby mode
Reference Voltage
IST
10
1.20 1.22 1.24
µA
V
Entire device
T =-20℃ to +85℃
a
VREF
VCC=2.5V to 7.0V
Reference Voltage
line-regulation
VREF-Line
1
5
mV
%
T =-20℃ to +85℃
a
Rference Variation
with Temperature
0.5 1.5
Input Offset Voltage
Source Current
Sink Current
VIO
IOH
IOL
10 mV
VCOMP = VREF -0.5V
VCOMP = 0.5V
T =-20℃ to +85℃
a
1.0 1.5 2.0 mA
μA
-160 -120 -80
Source current Variation
20
%
with temperature
Error amplifier
Sink current Variation
with temperature
T =-20℃ to +85℃
a
20
%
MHz
V
Unity Gain Bandwidth
Common Mode Input
Voltage Range
fT
10.0
VCOM
0.2
1.5
DC Open Loop Gain
AV
fosc
110
dB
KHz
AT1368A
AT1368B
250 300 350
Frequency
500 600 700
fosc
KHz
V
1.0
0.5
2
High Level Voltage
Low Level Voltage
Sawtooth wave
oscillator (OSC)
V
Variation with Power
Vcc=2.5V to 7V
%
%
Supply
Variation with
temperature
T =-20℃ to +85℃
a
7
-1.0
Charge Current of
ICSS
µA
SS
Soft-Start
Invalid threshold
voltage of SS
1.0
V
Charge Current of
ICSS
-1.25
1.0
µA
SS
Short-Circuit
Threshold Voltage of
SCP
V
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
4
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Duty≥95% PDRV=0V
Duty≤5% PDRV=5V
PDRV=-15mA
Output source current
Output sink current
Isource
Isink
-
-130 -80 mA
PDRV Output
Block
65 100
mA
Ω
ROH
18
16
30
25
Output ON resistor
PDRV=15mA
ROL
Ω
Duty≥95% NDRV=0V
Duty≤5% NDRV=5V
NDRV=-15mA
Output source current
Output sink current
Isource
Isink
-
-130 -80 mA
NDRV Output
Block
65 100
mA
Ω
ROH
18
30
25
Output ON resistor
CTL input voltage
NDRV=15mA
ROL
16
Ω
Active mode
Standby mode
CTL=5.0V
VCC rising
VCC falling
3V3 rising
3V3 falling
IL =1mA
VIH
1.5
0
VCC
0.8
20
V
Control Block
VIL
V
CTL input Current
ICTL
µA
V
VCC reset ON voltage
VCC reset hysteresis
3V3 reset ON voltage
3V3 reset hysteresis
Reset output voltage
Reset leakage current
VRSTON1
VRSTON1 hys
VRSTON2
VRSTON2 hys
VOL
4.10 4.20 4.30
100 mV
RESET Monitor
Block
2.94 3.0 3.06
V
100 mV
0.4
2.0
V
ILeak
µA
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Typical Application Circuit: 3V3 Output
L1: AT1368A: 22µH/0.77A/104mΩ TDK-SLF6028T-220MR77
AT1368B: 10µH/1A/74.5mΩ
R1: AT1368A: 100K
AT1368B: 10K
TDK-SLF6028T-100M1R0
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Typical Application Circuit: 2V5 Output
*1V8 Output: R4:9.8KΩ R5:38.7KΩ
*Vin from 2.5V to 7V, disable SCP function
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Typical Application Circuit: Zeta converter 3V3 Output
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
9
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
CH1:Reset CH2:SS CH3:Vout CH4:Vin
Fig.1 Vout:3.3V/1A Vin:5V Start-Up Waveform
Fig.2 Vout:2.5V/1A Vin:3.1V Start-Up Waveform
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
10
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Package Outline 16-pin SSOP
MILLIMETERS
INCHES
TYP
SYMBOL
MIN
TYP
MAX
MIN
MAX
A
A1
A2
b
1.35
0.10
-
1.60
0.15
-
1.75
0.25
1.50
0.30
0.25
5.00
-
0.053
0.004
-
0.063
0.006
-
0.069
0.010
0.059
0.012
0.010
0.197
-
0.20
0.18
4.80
-
-
0.008
0.007
0.189
-
-
C
-
-
D
4.85
0.20
5.99
3.91
0.71
0.64
-
0.191
0.008
0.236
0.154
0.028
0.025
-
ZD
E
5.79
3.81
0.41
-
6.20
3.99
1.27
-
0.228
0.150
0.016
-
0.244
0.157
0.050
-
E1
L
e
y
-
0°
0.076
8°
-
0°
0.003
8°
θ
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
11
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Package Outline 16-pin TSSOP
MILLIMETERS
INCHES
TYP
SYMBOL
MIN
TYP
MAX
MIN
MAX
A
A1
A2
b
1.05
0.05
-
1.10
0.10
1.00
0.25
0.127
5.075
6.40
4.40
0.60
0.65
-
1.20
0.15
1.05
0.28
-
0.041
0.002
-
0.043
0.004
0.039
0.010
0.005
0.1998
0.252
0.173
0.024
0.026
-
0.047
0.006
0.041
0.011
-
0.20
-
0.008
-
C
D
E
4.90
6.20
4.30
0.50
-
5.10
6.60
4.50
0.70
-
0.193
0.244
0.170
0.020
-
0.200
0.260
0.177
0.028
-
E1
L
e
y
-
0°
0.076
8°
-
0°
0.003
8°
θ
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
12
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
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)
Preheat Temperature(125±20°C)
Temperature maintained above 180°C
Time within 5°C of actual Peak
Temperature
5°C/second max.
120 seconds max.
10~150 seconds
10~20 seconds
10°C/second max.
60 seconds
Peak Temperature Range(Note 1)
219~225°C or
235~240°C
6°C /second max.
6 minutes max.
219~225°C or
235~240°C
10°C/second max.
Cooling Rate
Time 25°C to Peak Temperature
*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
3
Pkg. Volume ≥350 mm
Pkg. Volume <350 mm
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
13
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