AT1305 [AIMTRON]
PFM Step-Up DC/DC Converter with LDO; PFM升压型DC / DC转换器， LDO
| 型号： | AT1305 |
| 厂家： | 
AIMTRON TECHNOLOGY |
| 描述： | PFM Step-Up DC/DC Converter with LDO |
| 文件： | 总13页 (文件大小：454K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Features
General Description
• 0.8V Low Start-Up Input Voltage
• Up to 90%Efficiency
The AT1305 is a PFM step-up DC/DC converter
with LDO for applications using 1 Cell or 2 Cell
• Adjustable 100mA Output with 1 Alkaline Cell Alkaline battery and USB applications. Besides,
or 200mA Output with 2 Alkaline Cell
Battery input.
the 32µA low quiescent current together with high
efficiency maintains long battery life time. It
provides a constant output voltage for inputs that
vary above and below the output voltage.
• 1.8V/3.0V/3.3V/300mA Output with USB
Power input.
• Small Number of External Components needed
• Load Disconnects from Input in Shutdown
• Power good output
• 32µA Quiescent(Switch OFF) Supply current
• 1µA Shutdown Mode Supply current
• 8-Pin TSSOP package
Applications
• MP3
• Power source for battery-powered equipment
• Power source for cameras, camcorders, VCRs,
PDAs, electronic data banks, and hand-held
Communication equipment
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
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Pin Configuration
Ordering Information
Part number
AT1305
Package
Remarks
Date Code
,Date Code with one bottom line
Date Code
,Date Code with one bottom line
Date Code
,Date Code with one bottom line
8-pin Plastic TSSOP
8-pin Plastic TSSOP, Green
8-pin Plastic TSSOP
AT1305_GRE
AT1305 A
AT1305 A_GRE
AT1305 B
AT1305 B_GRE
8-pin Plastic TSSOP, Green
8-pin Plastic TSSOP
8-pin Plastic TSSOP, Green
AT1305:LDO set to 3.3V AT1305AP:LDO set to 3.0V AT1305BP:LDO set to 1.8V
*For more marking information, contact our sales representative directly
Pin Description
Pin No.
Symbol
I/O
Description
1
2
3
4
5
6
7
8
LX
O
Switching Output
EN
I
Enable Control Input, active high
Enable Control Input, active low
Ground
/ENPB
GND
PG
FB
OUT
VDD
I
-
O
I
Power Good Detected
Step-Up Converter feedback input
Output
O
-
Power input
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Absolute Maximum Ratings*1
(Ta=+250C)
Parameter
Symbol
Condition
Rated Value
Min. Max.
Unit
Power supply voltage
LX pin voltage
VDD
VLX
VOUT
—
—
—
—
—
—
—
—
—
—
—
—
6.0
6.0
6.0
6.0
2
V
V
V
V
A
mA
mW
0C
0C
OUT output voltage
Other I/O pin voltage
LX pin output current
LDO output Peak Current
Allowable dissipation
ILX
ILDO
PD
—
400
500
TSSOP8
Operating temperature
Storage temperature
TOP
Tstg
—
—
-30
-55
+85
+165
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.
Electrical Characteristics
(V =1.0V, V
IN
=2.8V, I
OUT
=0mA ,Ta=+250C)
OUT
Values
Typ.
Parameter
Symbol
Condition
Unit
Min.
Max.
Start-Up Voltage
VST
IOUT=1mA
0.7
-
0.8
2
-
-
V
V
Power On Reset
Threshold
VDD
AT1305,AT1305A
AT1305B
2.0
1.65
-
-
5.5
5.5
-
V
V
Operating V
Range
DD
VDD
No-Load Input
Current
Switch- Off Input
Current
μA
IIN1
IIN2
IIN3
VFB
IFB
IOUT=0mA
87
32
1
V
=5V
μA
μA
V
-
50
10
IN
Shutdown Current
Feedback Reference
FB Input Current
EN=0V, /ENPB=High
Close Loop VDD =2.85V
VFB =1.2V
-
1.176
1.2
-
1.224
50
-
-
nA
FS
μS
LX Switch On-time
V
OUT =2.85V
1.75
-
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
3
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
DMAX
RLX
Maximum Duty
VOUT =2.85V
N-Channel
-
-
85
-
-
%
LX ON Resistance
0.3
Ω
VLX =1.5V,
μA
A
LX Leakage Current
Current Limit Setting
LDO Current Limit
OUT ON Resistance
LDO enable threshold
LDO Line Regulation
LDO Load Regulation
IL
-
-
1
2
-
EN=0V,/ENPB=VDD
ILX
VDD =2.85V
1.5
350
0.5
4.0
1
ILDO
ROUT
VDD1
VDD =3.2V
-
mA
Ω
VDD =2.85V, IOUT=100mA
-
-
OUT regulated to
1.8/3.0/3.3V
-
-
V
Vin=4.5V~5.5V,
-
-
%
I
OUT=100mA
Vout=3.3V, IOUT=10~100mA
-
1
-
%
AT1305,AT1305A,
falling
VDD
-
2.7
1.65
0.4
-
-
V
PG Threshold
VDD2
AT1305B, VDD falling
-
-
V
PG sink current
IPG
ILPG
VIH
VIL
IPG=1mA
-
-
V
μA
V
PG Leakage current
VDD =3V
-
1
-
0.8
-
-
EN,/ENPB Trip Level
-
0.5
V
Note 1 : Once the output is in regulation , the AT1305/A/B operate down to a 0.7V input voltage.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
4
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Typical Operating Charateristics
Boost Converter Line Transient Response
Boost Converter Line Transient Response
Boost Converter Load Transient Response Boost Converter Load Transient Response
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
LDO Line Transient Response
LDO Load Transient Response
Boost Converter Start-up After Enable
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Typical Application Circuit
1Cell And USB Power Input
1Cell or USB Power Input
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Typical Operating Charateristics
1Cell and USB Power Input
Efficiency (Load at LDO output)
90
85
80
75
L=33uH
VDD=2.91V
70
Iout=100mA
0
1.0 1.1 1.2
0.9
1.5
1.3 1.4
Vin(V)
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
2Cell And USB Power Input
Efficiency (Load at LDO output)
95
90
85
80
L=33uH
VDD=3.3V
75
0
Iout=100mA
2.0 2.2 2.4
1.8
2.6 2.8 3.0
Vin(V)
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
9
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Function Description
Boost Converter
The AT1305 integrates a step-up, switch-mode DC/DC converter with a linear
regulator to provide step up/down voltage conversion. A pulse frequency modulation
(PFM) with a constant on time 4.5us and minimum off-time 1.4µs controls the
N-channel MOSFET. The linear regulator contains a P-channel MOSFET. In 1-cell or
2-cell battery input (When VBAT <VOUT), only the step-up regulator is active, and
the linear regulator behaves as a pass gate. The output voltage can be adjusted with
two external resistors. The formula show as follow equation.
R1
R2
VDD = V 1+
FB
R1
2
= 1.2× (1+
)
The maximum efficiency could be 89% over 50mA load range. The AT1305
guarantee starts up as low as 1.0V input.
LDO mode
The low-dropout linear regulator consists of a reference, an error amplifier and a
P-channel MOSFET. In USB mode, when VIN>4V, the linear regulator is active
automatically whether the EN and /ENPB is enabled or not. The output voltage is
default 3.3V, 3.0V and 1.8V version. Its driving capability is nearly 250mA.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
10
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Power good
The PG pin stays high impedance when the dc/dc converter or the LDO output
voltage high than 2.7 V, and falling down when the voltage low than 2.6V. It could be
used to enable the processor after the push-button start-up.
On/Off Control
A single pushbutton switch can be used to turn the AT1305 on and off. EN is pulled
low (internal) and /ENPB is pulled high when the AT1305 is off. When the switch is
pressed, /ENPB is pulled low and the IC turns on. The switch should be on long
enough for the processor to exit reset. The controller issues a logic high to EN, which
guarantees the IC will stay on regardless of the switch state.
EN
0
/ENPB
AT1305
ON
0
1
0
1
0
OFF
ON
1
1
ON
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
11
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Package Outline : 8-pin TSSOP
INCHES
MILLIMETERS
NOTES
SYMBOL
MIN
MAX
MIN
MAX
A
0.114
0.169
0.244
0.122
0.177
0.260
2.90
4.30
6.20
3.10
4.50
6.60
-
-
-
-
-
-
-
-
B
C
D
E
0.026
BSC
0.65 BSC
0.010
0.002
0.041
0.012
0.006
0.047
0.25
0.05
1.05
0.30
0.15
1.20
F
H
K
M
α
0.005
BSC
0.127 BSC
0.020
0.028
0.50
0.70
00
80
00
80
-
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
12
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Reflow Profiles
Profile Feature
Sn-Pb Eutectic Assembly
Pb-Free Assembly
Large Body
Pkg. thickness
≥2.5mm or Pkg.
volume ≥350mm3
Small Body
Pkg. thickness
<2.5mm or Pkg.
volume <350mm3
Large Body
Small Body
Pkg. thickness
≥2.5mm or Pkg.
Pkg. thickness
≥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
150°C
200°C
60-120 seconds
60-180 seconds
3°C/second max.
Tsmax to T
L
-Ramp-up Rate
Time maintained above:
-Temperature (T )
L
183°C
217°C
60-150 seconds
60-150 seconds
-Time (t )
L
Peak Temperature(T )
P
225+0/-5°C
10-30 seconds
240+0/-5°C
10-30 seconds
245+0/-5°C
10-30 seconds
250+0/-5°C
20-40 seconds
Time within 5°C of actual Peak
Temperature (t )
P
Ramp-down Rate
6°C/second max.
6 minutes max.
3°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.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
2/8/2006 REV:1.1
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
13
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