AP1604
PWM/PFM Dual Mode Step-down DC/DC Converter
Features
- Input voltage range: 2.2V~5.5V (V
OUT
type)
- Oscillator frequency: 600KHz (Typ.)
- Internal reference: 1.0V (Typ.)
- High efficiency: 93% (Typ .)
- Stand-by capability: I
STB
=2µA. (Typ.)
- Soft-start time set-up externally type possible
- Current limit and thermal shutdown protection
-
Pb-Free
Package: SOT23-5, SON-6(3×3×0.8mm)
General Descriptions
The AP1604 series are multi-functional step-down
DC/DC converters with built-in speed, low ON
resistance drivers. It is capable to deliver more than
800mA output current with external coil, diode and
capacitor.
Output voltage is set-up by the external resistors. (±
2.5% accuracy). The 600KHz AP1604 that can
work out with small value external components
comes out more compact board.
The device switches to and works under PFM mode
with light loads. It keeps at high efficiency for both
light loads and large output current.
AP1604 can be soft-start with a proper capacitor
connected between CE/SS pin and ground. The
stand-by current is less than 2uA when CE/SS pin
is at “LOW” status. The device is forced to switch
off as the voltage at that pin is lower than the
stipulated voltage.
Applications
●
Electronic Information Organizers
●
Palmtops
●
Cellular and portable phones
●
Portable Audio Systems
●
Various Multi-function Power Supplies
Pin Assignment
(Top View)
FB
5
CE/SS
4
Pin Descriptions
Pin Name
V
OUT
V
CC
GND
CE/SS
FB
SV
CC
Function
Output Voltage
Input Supply
Ground
Chip Enable / Soft Start
Feedback pin
Signal Power for SON only
AP1604A
1
V
OUT
2
GND
SOT23-5
3
V
CC
FB 1
SV
CC
2
CE 3
SON-6
6
5
V
OUT
V
CC
4 GND
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 Jun. 27, 2005
1/7
AP1604
PWM/PFM Dual Mode Step-down DC/DC Converter
Electrical Characteristics
V
IN
=5V, V
OUT
＝2V,
Load=300mA, Ta=25°C
Sym.
V
FB
V
IN
Parameter
FB
Input Voltage
Line Regulation
Load Regulation
UVLO Voltage（min.
operating voltage）
Operating Current
Conditions
Min.
0.975
2.2
-
-
-
-
-
-
800
500
85
15
1.4
-
-
-
Typ.
1.0
-
-
-
-
100
90
2
1000
600
90
25
-
-
93
350
Max.
1.025
5.5
0.12
1.2
2
150
120
-
1200
700
-
35
-
0.6
-
450
Units
V
V
%
%
V
µA
µA
µA
mA
kHz
%
%
V
V
%
mΩ
V
IN
=2.2~5.5V, Load=10mA
I
OUT
=10~800mA
V
CC
, voltage required to maintain H at
V
UVLO
V
OUT
I
CC
CE/SS=V
IN
, No Load
No external components,
I
CCQ
Supply Current
CE/SS=V
IN
, V
FB
=1.2V
No external components,
I
STB
Stand-by Current
CE/SS=0V, V
FB
=0V
peak current
I
CL
Current Limit
V
IN
=5V, V
OUT
=2V
Fosc Oscillator Frequency Load=300mA, V
IN
=5V, V
OUT
=2V
MAXDTY Maximum Duty Ratio
PFMDTY PFM Duty Ratio
No load
Apply 1.4V (min.) to CE/SS, determine
V
CEH
CE/SS ”High” Voltage
V
OUT
”High”
V
CEL
CE/SS ”Low” Voltage Same as V
CEH
, determine V
OUT
/”Low”
EFFI Efficiency
V
CC
=5V, V
OUT
=3.3V, Load=300mA
Rdson Rdson Condition
I
OUT
=300mA, V
IN
=5V, V
OUT
=2V
Typical Performance Characteristics
Vcc v.s. Operating Current
200
180
160
140
120
100
80
60
40
20
0
2.5
3
3.5
4
4.5
5
5.5
Vcc v.s. Quiescent Current
200
180
160
140
120
100
80
60
40
20
0
2.5
3
3.5
4
4.5
5
5.5
Operating Current (uA)
Vcc (V)
Quiescent Current (uA)
Vcc (V)
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Jun. 27, 2005
3/7
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