AP1624
PWM/PFM Dual Mode Step-up DC/DC Controller
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.1.1 Dec.23, 2004
1/7
Features
- Input Voltage Range: 0.9~6V
- PWM/PFM Switching Control
- High Efficiency: 90%
- Oscillator Frequency: 300kHz±15%
- Stand-by Current: I
STB
=3µA.Typ.
- Pb-Free Package: SOT23-5
Applications
- Electronic Information Organizers
- Palmtops
- Cellular and portable phones
- Portable Audio Systems
- Various Multi-function Power Supplies
General Descriptions
The AP1624 is multi-functional step-up DC/DC
controllers. Large output current is possible using
an externally connected N channel MOSFET, coil,
and diode.
Output voltage V
OUT
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 AP1624PFM/PWM 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 3µA.
Pin Assignment
1
3
2
5
4
FB
V
CC
EXT
CE
GND
SOT23-5
(TOP VIEW)
Pin Descriptions
Pin
No.
Pin
Name
Function
1 FB
Feedback
pin
2 V
CC
IC Power Supply pin
3 CE
Chip Enable:
H: Enable
L: Disable
4 GND
GND
pin
5
EXT
External N-MOSFET Connection
AP1624
PWM/PFM Dual Mode Step-up DC/DC Controller
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Dec.23, 2004
2/7
Ordering Information
AP1624 X X
W : SOT23-5
Packing
A : Taping
Package
Block Diagrams
Phase
Compensation
Vref with
CE
+
-
PWM/PFM
Controller
+
-
Ramp Wave
Generator,
OSC
Buffer,
Driver
FB
CE
GND
EXT
V
CC
PWM
Comparator
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
EXT Pin Voltage
V
EXT
-0.3 ~ V
CC
+0.3 V
EXT Pin Current
I
EXT
±
100
mA
Continuous Total
Power Dissipation
Pd 250 mW
Operating Ambient
Temperature
Topr -30
~
+80
o
C
Storage Temperature
Tstg
-40 ~ +125
o
C
AP1624
PWM/PFM Dual Mode Step-up DC/DC Controller
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Dec.23, 2004
3/7
Electrical Characteristics
AP1624 V
IN
=3.3V, V
OUT
5V, Load=300mA Ta=25
o
C
Parameter
Symbol
Conditions
Min.
Typ.
Max. Units
FB Voltage
V
FB
1.205
1.23
1.255
V
Maximum Input Voltage
V
CC
6
-
-
V
Supply Current 1
I
CC1
No external components,
CE=V
IN
,
V
FB
=1.5V
- 50
100
µA
Supply Current 2
I
CC2
No external components,
CE=V
IN
,
V
FB
=0V
- 100
200
µA
Stand-by Current
I
STB
No external components,
CE=0V,
V
FB
=0.5V
- 3 -
µA
Oscillator Frequency
Fosc
255
300
345
kHz
Maximum Duty Ratio
MAXDTY
No external components
V
CC
=5V, V
FB
=0V
80 - - %
PFM Duty Ratio
PFMDTY No load
15
25
35
%
CE "High" Voltage
V
CEH
Apply above 0.65Vcc (min.) to CE,
Operating mode
0.65 - - *Vcc
CE "Low" Voltage
V
CEL
Apply under 0.2Vcc (min.) to CE,
Standby mode
- -
0.20
*Vcc
EXT Source Current
I
SOURCE
V
CE
=V
IN
, V
FB
=0V, V
EXT
=V
CC
-0.4V - 40 - mA
EXT Sink Current
I
SINK
V
CE
=V
IN
, V
FB
=2V, V
EXT
=0.4V
- 70 - mA
Efficiency
EFFI
- 90 - %
AP1624
PWM/PFM Dual Mode Step-up DC/DC Controller
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Dec.23, 2004
4/7
Typical Application Circuit
(1) Normal Circuit
R1
NMOS
AF2302
2.5V~5.5V
EXT
CE
FB
GND
V
CC
SS240
10 H
V
IN
100K
0.1
R2
V
OUT
µ
470µ
470
µ
µ
0.1
µ
100
0.1
µ
0.1µ
V
OUT
=1.23
×
(1+
R2
R1
), R2=10K ~ 20K
(2) LV Circuit
220K
0.9V~2.5V
EXT
CE
FB
GND
V
CC
Schottky Diode
0.1
130K
C
P
3.3V
47µ
47µ
µ
L
100K
NPN
C
B
R
B
V
OUT
V
IN
R
B
=Adjust according to load and Tr.hFE levels
C
B
1/(2
×
R
B
×
F
OSC
×
0.7)
(3) HV Circuit
330K
FDS6612
Above to 5V
EXT
CE
FB
GND
V
CC
SS240
10 H
V
IN
100K
0.1
V
OUT
µ
470µ
0.1
µ
470
µ
µ
0.1
µ
R
24V/1A
ZD
5V
18K
AP1624
PWM/PFM Dual Mode Step-up DC/DC Controller
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Dec.23, 2004
5/7
Typical Performance Characteristics
AP1624 Load Regulation
11.5
11.6
11.7
11.8
11.9
12
12.1
12.2
12.3
12.4
12.5
0
200
400
600
800
1000
Load (mA)
Vout (V)
Vcc=5V,Vout=12V
AP1624 Load Regulation
4.6
4.65
4.7
4.75
4.8
4.85
4.9
4.95
5
0
200
400
600
800
1000
1200
Load (mA)
V
out (V)
Vcc=3.3V,Vout=5V
AP1624 Line Regulation
4.5
4.6
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
5.5
2.5
3
3.5
4
Vcc (V)
Vout
(V)
Vcc=3.3V,Vout=5V
8.0
8.2
8.4
8.6
8.8
9.0
9.2
9.4
9.6
9.8
10.0
-50
-25
0
25
50
75
100
Temperature (
o
C)
Vout
(V)
AP1624 Temperature v.s. Vout
Vcc=5V, Iout=300mA
250
260
270
280
290
300
310
320
330
340
350
0
0.2
0.4
0.6
0.8
1
1.2
AP1624 Load v.s. Frequency
Vcc = 3.3V
Frequency
(KHz)
Load (A)
AP1624 Vcc v.s. Frequency
200
230
260
290
320
350
380
410
2.5
3
3.5
4
4.5
5
5.5
Vcc (V)
Frequency
(KHz)
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