AIMTRON AT1305B-GRE

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
• Adjustable 100mA Output with 1 Alkaline Cell
or 200mA Output with 2 Alkaline Cell
Battery input.
• 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
The AT1305 is a PFM step-up DC/DC converter
with LDO for applications using 1 Cell or 2 Cell
Alkaline battery and 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.
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
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
AT1305_GRE
AT1305 A
AT1305 A_GRE
AT1305 B
AT1305 B_GRE
Package
8-pin Plastic TSSOP
8-pin Plastic TSSOP, Green
8-pin Plastic TSSOP
8-pin Plastic TSSOP, Green
8-pin Plastic TSSOP
8-pin Plastic TSSOP, Green
AT1305:LDO set to 3.3V
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
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
1
2
3
4
5
6
7
8
LX
EN
/ENPB
GND
PG
FB
OUT
VDD
O
I
I
O
I
O
-
Description
Switching Output
Enable Control Input, active high
Enable Control Input, active low
Ground
Power Good Detected
Step-Up Converter feedback input
Output
Power input
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
2/8/2006 REV:1.1
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
Power supply voltage
VDD
—
LX pin voltage
VLX
—
—
6.0
V
OUT output voltage
VOUT
—
—
6.0
V
—
—
6.0
V
—
—
2
A
Other I/O pin voltage
LX pin output current
ILX
LDO output Peak Current
Rated Value
Min.
Max.
—
6.0
Unit
V
ILDO
—
—
400
mA
Allowable dissipation
PD
TSSOP8
—
500
mW
Operating temperature
TOP
—
-30
+85
0
+165
0
Storage temperature
Tstg
—
-55
C
C
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
Parameter
(VIN=1.0V, VOUT =2.8V, IOUT=0mA ,Ta=+250C)
Symbol
Values
Condition
Unit
Min.
Typ.
Max.
0.7
0.8
-
V
-
2
-
V
AT1305,AT1305A
2.0
-
5.5
V
AT1305B
1.65
5.5
V
IIN1
IOUT=0mA
-
87
-
μA
IIN2
VIN=5V
-
32
50
μA
Shutdown Current
IIN3
EN=0V, /ENPB=High
-
1
10
μA
Feedback Reference
VFB
Close Loop VDD =2.85V
1.176
1.2
1.224
V
FB Input Current
IFB
VFB =1.2V
-
-
50
nA
LX Switch On-time
FS
VOUT =2.85V
-
1.75
-
μS
Start-Up Voltage
VST
Power On Reset
Threshold
VDD
Operating V DD
Range
VDD
No-Load Input
Current
Switch- Off Input
Current
IOUT=1mA
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
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
3
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Maximum Duty
LX ON Resistance
DMAX
RLX
VOUT =2.85V
-
85
-
%
N-Channel
-
0.3
-
Ω
1
μA
LX Leakage Current
IL
VLX =1.5V,
EN=0V,/ENPB=VDD
-
Current Limit Setting
ILX
VDD =2.85V
-
1.5
2
A
LDO Current Limit
ILDO
VDD =3.2V
-
350
-
mA
OUT ON Resistance
ROUT
VDD =2.85V, IOUT=100mA
-
0.5
-
Ω
LDO enable threshold
VDD1
-
4.0
-
V
-
1
-
%
Vout=3.3V, IOUT=10~100mA
-
1
-
%
AT1305,AT1305A,
falling
-
2.7
-
V
AT1305B, VDD falling
-
1.65
-
V
LDO Line Regulation
LDO Load Regulation
PG Threshold
VDD2
OUT regulated to
1.8/3.0/3.3V
Vin=4.5V~5.5V,
IOUT=100mA
VDD
PG sink current
IPG
IPG=1mA
-
0.4
-
V
PG Leakage current
ILPG
VDD =3V
-
-
1
μA
VIH
0.8
-
-
V
VIL
-
-
0.5
V
EN,/ENPB Trip Level
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
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 Load Transient Response
Boost Converter Line 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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
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
70
0
0.9 1.0
L=33uH
VDD=2.91V
Iout=100mA
1.1 1.2 1.3 1.4 1.5
Vin(V)
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
2/8/2006 REV:1.1
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
75
0
1.8
L=33uH
VDD=3.3V
Iout=100mA
2.0 2.2 2.4 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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
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 

VDD = VFB 1 +

 R2 
R1
= 1.2 × (1 +
)
R2
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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
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
0
1
1
/ENPB
0
1
0
1
AT1305
ON
OFF
ON
ON
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
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
11
AT1305
Preliminary Product Information
PFM Step-Up DC/DC Converter with LDO
Package Outline : 8-pin TSSOP
SYMBOL
A
B
C
D
E
F
H
K
M
α
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
2/8/2006 REV:1.1
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
Large Body
Small Body
Pkg. thickness
Pkg. thickness
<2.5mm or Pkg.
≥2.5mm or Pkg.
3
volume ≥350mm3 volume <350mm
Average ramp-up rate
(TL to TP)
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
Tsmax to TL
-Ramp-up Rate
Time maintained above:
-Temperature (TL)
-Time (tL)
Peak Temperature(TP)
Time within 5°C of actual Peak
Temperature (tP)
Ramp-down Rate
Time
25°C
to
Peak
Temperature
3°C/second max.
Pb-Free Assembly
Large Body
Small Body
Pkg. thickness
Pkg. thickness
≥2.5mm or Pkg.
≥2.5mm or Pkg.
volume ≥350mm3 volume ≥350mm3
3°C/second max.
100°C
150°C
60-120 seconds
150°C
200°C
60-180 seconds
3°C/second max.
183°C
60-150 seconds
217°C
60-150 seconds
225+0/-5°C
10-30 seconds
240+0/-5°C
10-30 seconds
6°C/second max.
6 minutes max.
245+0/-5°C
10-30 seconds
250+0/-5°C
20-40 seconds
3°C/second max.
8 minutes max.
*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
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: service@aimtron.com.tw
13