AT1305AP [GMT]
Switching Regulator/Controller,;
| 型号： | AT1305AP |
| 厂家： | 
GLOBAL MIXED-MODE TECHNOLOGY INC |
| 描述： | Switching Regulator/Controller, |
| 文件： | 总14页 (文件大小：382K) |
| 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
• Start-Up from 1.0V
The AT1305 is a PFM step-up DC/DC converter
•Adjustable 100mA Output with 1 or 2-cell with LDO for applications using 1 cell battery and
Battery input.
USB applications. Besides, 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/250mA 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
• 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.
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Pin Configuration
Ordering Information
Part number
AT1305
Package
Marking
AT1305P
8-pin Plastic TSSOP
8-pin Plastic TSSOP
8-pin Plastic TSSOP
AT1305 A
AT1305AP
AT1305 B
AT1305BP
AT1305:LDO set to 3.3V AT1305AP:LDO set to 3.0V AT1305BP:LDO set to 1.8V
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
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Absolute Maximum Ratings
(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
2.5
400
500
V
V
V
V
A
OUT output voltage
Other I/O pin voltage
LX pin output current
LDO output Peak Current
Allowable dissipation
ILX
ILDO
PD
—
mA
mW
TSSOP8
Operating temperature
Storage temperature
TOP
Tstg
—
—
-30
-55
+85
+165
0C
0C
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage,
current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
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
0.8
-
1
2
-
-
-
V
V
V
Power On Reset
Threshold
VDD
AT1305,AT1305A
AT1305B
2.0
1.6
-
5.5
5.5
-
Operating V
Range
DD
VDD
No-Load Input
Current
Switch- Off Input
Current
μA
μA
μA
V
IIN1
IIN2
IOUT=0mA
87
32
1
V
=5.5V
-
50
10
IN
Shutdown Current
Feedback Reference
FB Input Current
Constant on time
Maximum Duty
IIN3
EN=0V, /ENPB=High
Close Loop VDD =2.85V
VFB =1.2V
-
VFB
IFB
1.176
1.2
-
1.224
-
-
-
50
-
nA
FS
μS
%
VOUT =2.85V
4.5
85
DMAX
VOUT =2.85V
-
LX ON Resistance
RLX
N-Channel
-
0.3
-
Ω
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
VLX =5.5V,
μA
A
LX Leakage Current
Current Limit Setting
LDO Current Limit
OUT ON Resistance
LDO enable threshold
LDO Line Regulation
LDO Load Regulation
IL
-
-
-
2.5
350
0.5
4.0
1
1
3
-
EN=0V,/ENPB=VDD
ILX
VDD =2.85V
ILDO
ROUT
VDD1
VDD =3.2V
-
mA
Ω
VDD =2.85V, IOUT=100mA
-
-
OUT regulated to
1.8/3.0/3.3V
Vin=4.5V~5.5V,
IOUT=100mA
-
-
V
-
-
%
Vout=2.85V, 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
-
1.2
-
-
EN,/ENPB Trip Level
-
0.5
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
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 1.4us 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.
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
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
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Typical Application Schematic
1Cell or USB Power
Typical Operating Charateristics
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Boost Converter Line Transient Response
Boost Converter Line Transient Response
Boost Converter Load Transient Response
Boost Converter Load Transient Response
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
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
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
1Cell or USB Power
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
2Cell or USB Power
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Small Outline 8-pin TSSOP
INCHES
MILLIMETERS
NOTES
SYMBOL
MIN
MAX
MIN
MAX
A
B
0.114
0.169
0.244
0.122
0.177
0.260
2.90
4.30
6.20
3.10
4.50
6.60
-
-
-
-
-
-
-
-
C
D
E
F
H
K
M
α
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
0.005 BSC
0.127 BSC
0.020
0.028
0.50
0.70
00
80
00
80
-
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
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Reflow Condition
1.Infrared-Ray Reflow
2.Infrared-Ray Reflow(Pb-free)
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
14
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