Aimtron AT1391P 1- channel step-down pwm controller Datasheet

AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
Features
General Description
• High efficiency
• Using external P channel MOSFET
• Maximum Duty 100%
• Oscillation frequency 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
• Input voltage: 2.5V ~7.0V
The AT1391 provides complete control and
protection for a DC/DC converter optimized for
high-performance microprocessor applications. It
is designed to drive one P-Channel in a buck
topology. The AT1391 integrates all of the control,
output adjustment, 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 AT1391 is a family of low-noise
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.
Applications
• Power Supply for portable devices
Block Diagram
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
3/15/2006 REV:1.1
Email:[email protected]
1
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
Pin Configuration
Ordering Information
Part number
AT1391P
AT1391P_GRE
Package
TSSOP8
TSSOP8, Green
Marking
AT1391P
AT1391P, date code with one bottom line
*For more marking information, contact our sales representative directly
Pin Description
Symbol
Pin No.
GND
VCC
1
2
SCP
CTL
3
4
Descript
Control blocks ground
Power blocks power
supply
Short-Circuit protection
Chip enable, high active
Symbol
Pin
No.(A/B)
Descript
SS
FB
5
6
COMP
OUT
7
8
Sotf-start
Error amplifier inverting
input
Error amplifier output
Output for Pch-MOSFET
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
2
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
Absolute Maximum Ratings*1
Parameter
Power Supply Voltage
Source Average Current of OUT
Sink Average Current of OUT
Source Peak Current of OUT
Sink Peak Current of OUT
Input Voltage to Error Amplifier
Continuous power dissipation
Operating temperature
Storage temperature
ESD Susceptibility *2
Condition
—
—
—
—
—
—
TSSOP8(Ta=+25℃)
—
—
HBM
MM
Rated Value
Min.
Max.
+7
-50
50
-200
200
6.5
500
-30
+85
-55
+125
2
200
Unit
V
mA
mA
mA
mA
V
mW
0
C
0
C
KV
V
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)
Parameter
Power supply voltage
Control input voltage
Operating temperature
Symbol
VCC
VCTL
TOP
Values
Min.
2.5
0
-20
Typ.
--+25
Unit
Max.
6
6
+85
V
V
°C
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
3
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
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
6.0
V
1.0
1.5
mA
10
µA
V
1
5
mV
0.5
1.5
%
-1.5
120
10
-2.0
80
mV
mA
μA
20
%
20
%
VCC=2.5V to 6.0V
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
-1.0
160
Ta =-20℃ to +85℃
fT
10.0
0.2
VCOM
AV
500
fosc
MHz
1.5
110
600
V
dB
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
Output source current
Vcc=2.5V to 6V
2
Ta =-20℃ to +85℃
7
Isource
Duty≥95% OUT=0V
%
-1.0
µA
1.0
V
-1.5 -1.25 -1.0
µA
0.8
0.9
1.0
V
-
-130
-80
mA
ICSS
ICSCP
%
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
4
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
Output Block
Output sink current
Output ON resistor
Control Block
CTL input voltage
CTL input Current
Isink
Duty≤5% OUT=5V
ROH
OUT=-15mA
18
30
Ω
ROL
OUT=15mA
16
25
Ω
VIH
Active mode
2.0
VCC
V
VIL
Standby mode
0
0.5
V
ICTL
CTL=5.0V
20
µA
65
100
mA
Application Circuit
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
5
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
6
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
7
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
Small Outline
SYMBOL
A
B
C
D
E
F
H
K
M
α
8-pin TSSOP
INCHES
MIN
MAX
0.114
0.122
0.169
0.177
0.244
0.260
0.026
BSC
0.010
0.012
0.002
0.006
0.041
0.047
0.005
BSC
0.020
0.028
80
00
MILLIMETERS
MIN
MAX
2.90
3.10
4.30
4.50
6.20
6.60
0.65 BSC
0.25
0.30
0.05
0.15
1.05
1.20
0.127 BSC
0.50
0.70
00
80
NOTES
-
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
8
AT1391
Preliminary Product Information
1-Channel Step-Down PWM Controller
Reflow Condition (IR/Convection or VPR Reflow)
Classification Reflow Profiles
Profile Feature
Average ramp-up rate
(TL to TP)
Sn-Pb Eutectic Assembly
3°C/second max.
Pb-Free Assembly
3°C/second max.
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
183°C
60-150 seconds
217°C
60-150 seconds
See table 1
10-30 seconds
See table 2
10 seconds max.
6°C/second max.
6 minutes max.
6°C/second max.
8 minutes max.
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
Time maintained above:
-Temperature (TL)
-Time (tL)
Peak/Classification Temperature(TP)
Time within 5°C of actual Peak
Temperature (tP)
Ramp-down Rate
Time 25°C to Peak Temperature
*All temperatures refer to topside of the package, measured on the package body surface.
Classification Reflow Profiles(Cont.)
Table 1. SnPb Entectic Process –Package Peak Reflow Temperatures
Package Thickness
<2.5mm
≥2.5mm
3
Volume mm <350
240+0/-5℃
225+0/-5℃
Volume mm3≥350
225+0/-5℃
225+0/-5℃
Table 2. Pb-free Process –Package Classification Reflow Temperatures
Package Thickness
<1.6mm
1.6mm - 2.5mm
≥2.5mm
3
Volume mm <350
260+0℃
260+0℃
250+0℃
Volume mm3 350-2000
260+0℃
250+0℃
245+0℃
Volume mm3>2000
260+0℃
245+0℃
245+0℃
*Tolerance: The device manufacturer/supplier shall assure process compatibility up to and
including the stated classification temperature (this means Peak reflow temperature +0˚С. For
example 260˚С+0˚С) at the rated MSL level.
7F, No.9, PARK AVENUE 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
3/15/2006 REV:1.1
Email:[email protected]
9
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