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AP1604A
PWM/PFM DUAL MODE STEP-DOWN DC/DC
CONVERTER
Features
• Input voltage range: 2.2V~5.5V (V
• Oscillator frequency: 600KHz (Typ.)
• Internal reference: 1.0V (Typ.)
• High efficiency: 93% (Typ.)
• Stand-by capability: I
• Soft-start time set-up externally type possible
• Current limit and thermal shutdown protection
• Lead Free Package: SOT25
• SOT25: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
=2µA. (Typ.)
STB
OUT
Applications
• Electronic Information Organizers
• Palmtops
• Cellular and portable phones
• Portable Audio Systems
• Various Multi-function Power Supplies
Ordering Information
AP1604A W X - 7
type)
General Description
The AP1604A 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 ca pacitor.
Output voltage is set-up by the external resistors. (±2.5%
accuracy). The 600K Hz AP1604A that can work out with sm all
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.
AP1604A 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.
Package Lead Free
W : SOT25
L : Lead Free
Packing
7 : Tape & Reel
G : Green
Device
AP1604AWL-7
Lead-free
AP1604AWG-7
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
Package
Code
W SOT25
W SOT25
Packaging
(Note 2)
.
.
Quantity Part Number Suffix
3000/Tape & Reel -7
3000/Tape & Reel -7
7” Tape and Reel
AP1604A Rev. 2 1 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Page 2
Pin Assignment
(Top View)
FB
5 4
1 32
V
OUT
Pin Description
Pin Name Description
V
Output Voltage
OUT
GND Ground
VCC Input Supply
CE/SS Chip Enable / Soft Start
FB Feedback pin
Block Diagram
AP1604A
PWM/PFM DUAL MODE STEP-DOWN DC/DC
CONVERTER
CE/SS
AP1604A
V
GND
SOT25
CC
SV
CC
FB
Phase
Compensation
Current Limit
V
CC
+
ERR
AMP
-
Soft
Start
CE/SS GND
Vref with
CE
AP1604A Rev. 2 2 of 7 FEBRUARY 2009
PWM/PFM
Controller
www.diodes.com © Diodes Incorporated
+
-
Comparator
Ramp Wave
Generator,
OSC
PWM
V
OUT
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AP1604A
PWM/PFM DUAL MODE STEP-DOWN DC/DC
CONVERTER
Absolute Maximum Ratings (T
=25°C)
A
Symbol Parameter Ratings Units
VCC/SVCC VIN Pin Voltage -0.3 ~ 6.5 V
V
V
OUT
Pin Voltage -0.3 ~ VIN+0.3 V
OUT
VFB FB Pin Voltage -0.3 ~ VIN+0.3 V
V
CE/SS Pin Voltage -0.3 ~ VIN+0.3 V
CE/SS
PD Continuous Total Power Dissipation Internal limited
TOP Operating Ambient Temperature -25 ~ +80 °C
TST Storage Temperature Range -40 ~ +125 °C
Electrical Characteristics
V
= 5V, V
IN
Sym. Parameter Conditions Min Typ. Max Units
VFB FB 0.975 1.0 1.025 V
VIN Input Voltage 2.2 - 5.5 V
Line Regulation V
Load Regulation I
V
UVLO
ICC Operating Current CE/SS = VIN,No Load - 100 150 μA
I
Supply Current
CCQ
I
Stand-by Current
STB
ICL Current Limit
Fosc Oscillator Frequency Load = 300mA, VIN= 5V, V
MAXDTY Maximum Duty Ratio 85 90 - %
PFMDTY PFM Duty Ratio No load 15 25 35 %
V
CE/SS ”High” Voltage
CEH
V
CE/SS ”Low” Voltage Same as V
CEL
EFFI Efficiency VCC= 5V, V
Rdson Rdson Condition I
＝2V, Load = 300mA, TA = 25°C
OUT
UVLO Voltage（min.
operating voltage）
= 2.2 ~ 5.5V, Load = 10mA - - 0.12 %
IN
= 10 ~ 800mA - - 1.2 %
OUT
V
, voltage required to maintain H at
CC
V
OUT
No external components,
CE/SS = V
IN,VFB
= 1.2V
No external components,
CE/SS = 0V,V
FB
= 0V
peak current
V
IN
= 5V, V
OUT
= 2V
= 2V 500 600 700 kHz
OUT
Apply 1.4V (min.) to CE/SS, determine
V
”High”
OUT
= 300mA, V
OUT
, determine V
CEH
= 3.3V, Load = 30 0mA - 93 - %
OUT
= 5V, V
IN
/”Low” - - 0.6 V
OUT
= 2V - 350 450 mΩ
OUT
- - 2 V
- 90 120 μA
- 2 - μA
800 1000 1200 mA
1.4 - - V
AP1604A Rev. 2 3 of 7 FEBRUARY 2009
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Page 4
V
V
)
V
V
V
V
)
PWM/PFM DUAL MODE STEP-DOWN DC/DC
Typical Performance Characteristics
cc vs. Operating Current
200
180
160
140
120
100
80
60
40
Operating Current (uA)
20
0
2.5 3 3.5 4 4.5 5 5.5
Vcc (V
cc vs. Stand-by Current
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
St and- by Curr e nt ( uA )
0.5
0
2.5 3 3.5 4 4.5 5 5.5
Vcc (V)
cc vs. Current Limit
1.4
1.3
1.2
1.1
0.9
0.8
0.7
Current Limit (A)
0.6
0.5
Current Limit
1
Vout=2V
33.544.555.5
Vcc (V
AP1604A
CONVERTER
cc vs. Quiescent Current
200
180
160
140
120
100
80
60
40
Quiescent Current (uA)
20
0
2.533.544.555.5
700
680
660
640
620
600
580
560
Frequency (KHz)
540
520
500
2.533.544.555.5
600
500
400
(mΩ)
300
DS(ON)
200
R
100
0
2.5 3 3.5 4 4.5 5 5.5
Vcc (V)
cc vs. Frequency
Vcc (V)
cc vs. R
Vcc (V)
DS(ON)
AP1604A Rev. 2 4 of 7 FEBRUARY 2009
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Page 5
×
PWM/PFM DUAL MODE STEP-DOWN DC/DC
Typical Performance Characteristics (Continued)
Line Regulation Load Regulation
0.3
3
AP1604A
CONVERTER
0.2
0.1
(%)
0.0
OUT
-0.1
V / V
-0.2
-0.3
2.533.544.555.5
Vcc (V)
2
1
0
(%)
OUT
-1
V / V
-2
-3
0 100 200 300 400 500 600 700 800
Load (mA)
Typical Application Circuit
2.2V ~ 5.5V
V
IN
68uF
1M
0.1uF
V
CC
Ω
AP1604A
CE/SS
GND
10nF
V
OUT
FB
~
100nF
Vout = 1
R1 = 100K ~ 200K
AP1604A Rev. 2 5 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
(1 +
10uH
B240A R2
R2
)
R1
R1
V
0.1uF 68uF
OUT
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Marking Information
(1) SOT25
AP1604A
PWM/PFM DUAL MODE STEP-DOWN DC/DC
CONVERTER
( Top View )
5
7
4
XX : Identification code
Y
: Year 0~9
XX
W X
Y
: Week : A~Z : 1~26 week;
W
a~z : 27~52 week; z represents
52 and 53 week
: a~z : Lead Free
1 2 3
X
A~Z : Green
Part Number Package Identification Code
AP1604AW SOT25 ER
Package Information (All Dimensions in mm)
(1) Package Type: SOT25
AP1604A Rev. 2 6 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Page 7
AP1604A
PWM/PFM DUAL MODE STEP-DOWN DC/DC
CONVERTER
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
AP1604A Rev. 2 7 of 7 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
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