ETC AT1368

AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Features
• High efficiency (min. 90% On IO=300mA
~600mA)
• 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.
General Description
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 NChannel 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 stepdown 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.
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: [email protected]
1
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Pin Configuration
Ordering Information
Part number
AT1368A
AT1368B
AT1368B
Package
SSOP16
SSOP16
TSSOP16
Marking
AT1368AR
AT1368BR
AT1368BP
A: fosc =300KHz B: fosc =600KHz
Pin Description
Symbol
Pin No.
Descript
Symbol
Pin
No.(A/B)
Descript
FB
1
SCP
9
Short-Circuit protection
COMP
PVCC
2
3
CTL
NC
10
11
Chip enable, high active
-
PDRV
4
Inverting input to error
amplifier
Error amplifier output
Power blocks power
supply
Output for Pch-MOSFET
IN1
12
NDRV
PGND
5
6
Output for Nch-MOSFET
Power blocks ground
RESET
IN2
13
14
GND
VCC
7
8
Control blocks ground
Control blocks power
supply
SS
3V3
15
16
VCC monitor voltage
adjustable input pin
Power Good indicator
3V3 output monitor
adjustable input pin
Sotf-start
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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
2
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Absolute Maximum Ratings
Parameter
Condition
Power Supply Voltage
Source Average Current of PDRV,
NDRV
Sink Average Current of PDRV,
NDRV
Source Peak Current of PDRV,
NDRV
Sink Peak Current of PDRV,
NDRV
Input Voltage to Error Amplifier
Continuous power dissipation
Operating temperature
Storage temperature
—
—
Rated Value
Min.
Max.
+8
-50
Unit
V
mA
—
-
50
mA
—
-
-200
mA
—
-
200
mA
—
SSOP16(Ta=+25℃)
—
—
-30
-55
6.5
560
+85
+125
V
mW
0
C
0
C
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
Power supply voltage
Control input voltage
Operating temperature
Symbol
VCC
VCTL
TOP
Values
Min.
2.5
0
-20
Typ.
--+25
Unit
Max.
7
7
+85
V
V
°C
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: [email protected]
3
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Electrical Characteristics
(VCC = 5V,Ta =+25℃ , unless otherwise noted. )
Parameter
Symbol
Condition
Values
Unit
Min. Typ. Max.
Input Supply Range
VCC
Quiescent Current
ICC
Current in standby mode
IST
Entire device
Reference Voltage
VREF
Reference Voltage
line-regulation
VREF-Line
Error amplifier
Frequency
Sawtooth wave
oscillator (OSC)
Soft-Start
Short-Circuit
Duty=50%,
fOSC=600KHz
PDRV/NDRV No Load
CTL=0V
Ta =-20℃ to +85℃
VIO
IOH
IOL
7.0
V
1.0
1.5
mA
10
µA
V
1
5
mV
0.5
1.5
%
1.0 1.5
-160 -120
10
2.0
-80
mV
mA
μA
20
%
20
%
VCC=2.5V to 7.0V
VCOMP = VREF -0.5V
VCOMP = 0.5V
Ta =-20℃ to +85℃
--
1.20 1.22 1.24
Ta =-20℃ to +85℃
Rference Variation
with Temperature
Input Offset Voltage
Source Current
Sink Current
Source current Variation
with temperature
Sink current Variation
with temperature
Unity Gain Bandwidth
Common Mode Input
Voltage Range
DC Open Loop Gain
2.5
Ta =-20℃ to +85℃
fT
10.0
VCOM
0.2
1.5
fosc
AT1368A
250
110
300
fosc
AT1368B
500
600
AV
MHz
V
dB
350 KHz
700 KHz
High Level Voltage
1.0
V
Low Level Voltage
Variation with Power
Supply
Variation with
temperature
Charge Current of
SS
Invalid threshold
voltage of SS
Charge Current of
SS
Threshold Voltage of
SCP
0.5
V
ICSS
ICSS
Vcc=2.5V to 7V
2
Ta =-20℃ to +85℃
7
%
%
-1.0
µA
1.0
V
-1.25
µA
1.0
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: [email protected]
4
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
PDRV Output
Block
Output source current
Isource
Duty≥95% PDRV=0V
-
-130
Output sink current
Isink
Duty≤5% PDRV=5V
65
100
ROH
PDRV=-15mA
18
30
Ω
ROL
PDRV=15mA
16
25
Ω
Output source current
Isource
Duty≥95% NDRV=0V
-
-130
-80
mA
Output sink current
Isink
Duty≤5% NDRV=5V
65
100
ROH
NDRV=-15mA
18
30
Ω
ROL
NDRV=15mA
16
25
Ω
VIH
Active mode
1.5
VCC
V
VIL
Standby mode
0
0.8
V
ICTL
CTL=5.0V
20
µA
Output ON resistor
NDRV Output
Block
Output ON resistor
Control Block
CTL input voltage
CTL input Current
VCC reset ON voltage
RESET Monitor
Block
VRSTON1 VCC rising
VCC reset hysteresis
VRSTON1 hys VCC falling
3V3 reset ON voltage
VRSTON2 3V3 rising
3V3 reset hysteresis
VRSTON2 hys 3V3 falling
Reset output voltage
VOL
Reset leakage current
ILeak
IL =1mA
-80
mA
mA
mA
4.10 4.20 4.30
2.94
3.0
V
100
mV
3.06
V
100
mV
0.4
V
2.0
µA
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: [email protected]
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
TDK-SLF6028T-100M1R0
R1: AT1368A: 100K
AT1368B: 10K
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: [email protected]
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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]m.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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
10
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Package Outline 16-pin SSOP
SYMBOL
A
A1
A2
b
C
D
ZD
E
E1
L
e
y
θ
MILLIMETERS
MIN
TYP
MAX
1.35
1.60
1.75
0.10
0.15
0.25
1.50
0.20
0.30
0.18
0.25
4.80
4.85
5.00
0.20
5.79
5.99
6.20
3.81
3.91
3.99
0.41
0.71
1.27
0.64
0.076
0°
8°
MIN
0.053
0.004
0.008
0.007
0.189
0.228
0.150
0.016
0°
INCHES
TYP
0.063
0.006
0.191
0.008
0.236
0.154
0.028
0.025
-
MAX
0.069
0.010
0.059
0.012
0.010
0.197
0.244
0.157
0.050
0.003
8°
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: [email protected]
11
AT1368
1-Channel Synchronous Buck PWM Controller
with Power Good Reset
Package Outline 16-pin TSSOP
SYMBOL
A
A1
A2
b
C
D
E
E1
L
e
y
θ
MILLIMETERS
MIN
TYP
MAX
1.05
1.10
1.20
0.05
0.10
0.15
1.00
1.05
0.20
0.25
0.28
0.127
4.90
5.075
5.10
6.20
6.40
6.60
4.30
4.40
4.50
0.50
0.60
0.70
0.65
0.076
0°
8°
MIN
0.041
0.002
0.008
0.193
0.244
0.170
0.020
0°
INCHES
TYP
0.043
0.004
0.039
0.010
0.005
0.1998
0.252
0.173
0.024
0.026
-
MAX
0.047
0.006
0.041
0.011
0.200
0.260
0.177
0.028
0.003
8°
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: [email protected]
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
Average Heating Rate(180°C to peak)
5°C/second max.
120 seconds max.
Preheat Temperature(125±20°C)
10~150 seconds
Temperature maintained above 180°C
Time within 5°C of actual Peak 10~20 seconds
Temperature
Peak Temperature Range(Note 1)
219~225°C or
235~240°C
Cooling Rate
6°C /second max.
6 minutes max.
Time 25°C to Peak Temperature
VPR
10°C/second max.
60 seconds
219~225°C or
235~240°C
10°C/second max.
*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
Pkg. Volume ≥350 mm
Pkg. Volume <350 mm3
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
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: [email protected]
13