AP1609
PWM/PFM Dual Mode Step-up DC/DC Converter
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.2 Mar.25, 2005
1/8
Features
- Input Voltage Range: 2.5~6V
- Output Voltage Range: 3.0~17V±2.5%
- PWM/PFM Switching Control
- Oscillator Frequency: 300KHz±20%
- High Efficiency: 91%Typ .
- Stand-by Current: I
STB
1µA.Typ.
- Built-in internal N-Channel MOS
- Pb-Free Package: SOP-8L/TSSOP-8L
Applications
- Electronic Information Organizers
- Palmtops
- Cellular and portable phones
- Portable Audio Systems
- Various Multi-function Power Supplies
General Descriptions
The AP1609 is high efficient step-up DC/DC
converter. Large output current is possible having
a built in internal N channel MOSFET, and using an
external coil and diode.
Output voltage is programmable with 1.23V of
standard voltage supply internal, and using
externally connected components, output voltage
FB can be set up at will.
With a 300KHz switching frequency, the size of the
external components can be reduced. Control
switches from PFM to PWM during light loads with
the AP1609PWM/PFM switchableand the series
is highly efficient from light loads to large output
currents.
During stand-by time CE pin "Low", current
consumption is reduced to 1µA.
Pin Assignment
1
2
3
4
8
7
6
5
CE
LX
FB
AP1609
LX
GND
GND
PGND
Vcc
SOP-8L
1
3
2
4
8
6
7
5
GND
Vcc
Vcc
CE
LX
PGND
PGND
FB
AP1609
TSSOP-8L
Pin Descriptions
Pin No.
Pin
Name SOP TSSOP
Description
FB 3 5 Feedback
pin
CE 1 4
Chip Enable:
H: Enable
L: Disable
Vcc 2 23 IC signal power supply pin
PGND
4
67 Power MOSFET GND
LX
56
8
Switch Pin. Connect
external inductor/diode
here. Minimize trace area
at this pin to reduce EMI.
GND 78
1 GND
Pin
AP1609
PWM/PFM Dual Mode Step-up DC/DC Converter
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Mar.25, 2005
2/8
Ordering Information
AP1609 X X
S : SOP-8L
TS: TSSOP-8L
Packing
A : Taping
Package
Block Diagrams
Phase
Compensation
Vref with
CE
+
-
PWM/PFM
Controller
+
-
Ramp Wave
Generator,
OSC
Buffer,
Driver
FB
CE
PGND
LX
PWM
Comparator
GND
Vcc
Absolute Maximum Ratings
Ta=25
o
C
Parameter
Symbol
Ratings
Units
V
IN
Pin Voltage
V
CC
-0.3 ~ 7
V
FB Pin Voltage
V
FB
-0.3 ~ V
CC
+0.3 V
CE Pin Voltage
V
CE
-0.3 ~ V
CC
+0.3 V
Switch Voltage (LX to GND)
V
SW
-0.3 ~ 18
V
Switch Current
I
LX
-3 ~ 0.2
A
SOP-8L 1200
Continuous Total
Power Dissipation
Pd
TSSOP-8L 700
mW
Operating Ambient
Temperature
Topr
-20 ~ +80
o
C
Storage Temperature
Tstg
-20 ~ +125
o
C
AP1609
PWM/PFM Dual Mode Step-up DC/DC Converter
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Mar.25, 2005
3/8
Electrical Characteristics
AP1609 F
OSC
300kHz, V
OUT
5V Ta=25
o
C
Parameter
Symbol
Conditions
Min.
Typ.
Max. Units
FB Voltage
V
FB
1.20
1.23
1.26
V
Input Voltage
V
CC
2.5 - 6 V
Output Voltage
V
OUT
3.0
-
17
V
Maximum Switching
Output Current
I
OUT
2.4 - - A
Drain-Source On-state
Resistance
R
DS(ON)
I
D
=2.4A -
100
-
m
Quiescent Current
I
CCQ
No
load,
FB=2V,
CE=High
- 80 130
µA
Shutdown Current
I
SD
No
load,
CE=Low
- 1 - µA
Oscillator Frequency
Fosc
Measuring of EXT waveform,
V
IN
=output voltage+0.3V
240 300 360 kHz
Maximum Duty Ratio
MAXDTY
80
-
-
%
PFM Duty Ratio
PFMDTY
No load
15
25
35
%
CE "High" Voltage
V
CEH
No external components,
V
FB
=0V,
apply 0.65V
CC
(min.) to CE,
Chip enable
0.65 - - *V
CC
CE "Low" Voltage
V
CEL
Same as V
CEH
,
Chip disable
- -
0.20
*V
CC
Efficiency
EFFI
- 91 - %
AP1609
PWM/PFM Dual Mode Step-up DC/DC Converter
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Mar.25, 2005
4/8
Typical Application Circuit
(1) Normal Circuit
LX
V
CC
FB
GND
CE
2.5V~6V
PGND
SS340
R
1
R
2
C
BP
0.1u
100u
Vout
0.1u
330K
3.3u
0.1u
100
100u
Vout=1.23 (1+ ) , R
2
=10K~100K
R
1
R
2
×
10uH
Option
(2) HV Circuit
LX
V
CC
FB
GND
CE
above 5.5V
PGND
SS340
R
1
R
2
0.1u
470u
15V
0.1u
330K
ZD
0.1u
R
470u
Vout=1.23 (1+ ) , R
2
=10K~100K
R
1
R
2
×
3.3u
10uH
5V
C
BP
Option
AP1609
PWM/PFM Dual Mode Step-up DC/DC Converter
Anachip Corp.
www.anachip.com.tw
Rev.1.2 Mar.25, 2005
5/8
Typical Performance Characteristics
0
30
60
90
120
150
180
210
3
3.5
4
4.5
5
5.5
6
Vcc v.s. Supply Current
Vcc (V)
Su
ppl
y Cur
r
ent
(u
A)
V
CE
=Vcc
Vcc v.s. Frequency
100
150
200
250
300
350
400
3
3.5
4
4.5
5
5.5
6
Vcc (V)
F
r
equenc
y (KHz
)
Load=300mA
Line Regulation
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
3
3.5
4
4.5
5
5.5
6
Vcc (V)
Line
Regulat
ion (%)
Load=50mA
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
0
200
400
600
800
1000
Load (mA)
Load Regulat
ion (
%
)
Load Regulation
Vcc=5V
60
65
70
75
80
85
90
95
100
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Load (A)
Efficie
n
c
y
Load v.s. Efficiency
Vcc=3.3V,Vout=5V
60
65
70
75
80
85
90
95
100
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Load (A)
Ef
f
i
c
i
enc
y
Load v.s. Efficiency
Vcc=5V,Vout=12V
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