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AP1603WL-7 [DIODES]

STEP-UP DC/DC CONVERTER; 升压型DC / DC转换器
AP1603WL-7
型号： AP1603WL-7
厂家： DIODES INCORPORATED    DIODES INCORPORATED
描述：

STEP-UP DC/DC CONVERTER
升压型DC / DC转换器

转换器 稳压器 开关式稳压器或控制器 电源电路 开关式控制器 光电二极管
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AP1603  
STEP-UP DC/DC CONVERTER  
General Description  
Features  
The AP1603 is a high efficiency step-up DC/DC converter for  
applications using as few as a single NiMH or Li-Ion battery cells.  
Only four external components are required to deliver a fixed  
output voltage of 3.3V. The AP1603 starts up from less than 0.9V  
input with 1mA load. Pulse Frequency Modulation scheme brings  
optimized performance for applications with light output loading  
and low input voltages. The output ripple and noise are lower  
compared with the circuits operating in PSM mode.  
•
•
•
•
•
•
•
A Guaranteed Start-Up from less than 0.9 V  
High Efficiency  
Low Quiescent Current  
Less Number of External Components needed  
Low Ripple and Low Noise  
Space Saving Lead-Free Packages: SOT26  
Lead Free Finish/RoHS Compliant for Lead Free  
products (Note 1)  
The PFM control circuit operating in 150KHz (max.) switching  
rate results in smaller passive components. The space saving  
SOT26 packages make the AP1603 an ideal choice of DC/DC  
converter for space conscious applications, like pagers,  
electronic cameras, and wireless microphones.  
Applications  
•
•
•
•
•
•
Pagers  
Cameras  
Wireless Microphones  
Pocket Organizers  
Battery Backup Suppliers  
Portable Instruments  
Ordering Information  
X X X  
A P 1 6 0 3  
Package  
Lead-Free  
Packing  
W : SOT26  
L :Lead-Free  
(Note 2)  
- 7 : Taping  
Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.  
Packaging  
(Note 2)  
SOT26  
7” Tape and Reel  
Device  
Package Code  
Quantity  
Part Number Suffix  
AP1603W  
W
3000/Tape & Reel  
-7  
Lead-free  
Note:  
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.  
AP1603 Rev. 1  
1 of 8  
NOVEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP1603  
STEP-UP DC/DC CONVERTER  
Pin Descriptions  
Pin Assignments  
Name  
FB Feedback  
GND Ground  
Description  
1
6
5
FB  
SHDN  
OUT  
AP1603  
2
3
GND  
REF  
1.2V Reference Voltage. Bypass with a  
0.1µF capacitor.  
N-Channel and P-Channel Power MOSFET  
Drain  
REF  
LX  
4 LX  
SOT26  
Power Output. OUT provides bootstrap  
power to the IC.  
OUT  
Shutdown Input. Drive high (>80% of VOUT  
)
for operating mode. Drive low (<20% of  
SHDN  
VOUT) for shutdown mode. Connect to OUT  
for normal operation.  
Block Diagram  
0.1uF  
22uH  
Zero  
Crossing  
Amplifier  
OUT  
Minimum  
Off-Time  
One-Shot  
47uF  
EN  
SHDN  
Q
TRIG  
One-Shot  
P
N
VIN  
47uF  
LX  
F/F  
S
Q
GND  
R
Maximum  
On-Time  
One-Shot  
Current-Limit  
Amplifier  
TRIG  
Q
One-Shot  
FB  
FB  
Error  
Amplifier  
REF  
0.1uF  
AP1603 Rev. 1  
2 of 8  
NOVEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP1603  
STEP-UP DC/DC CONVERTER  
Absolute Maximum Ratings  
Symbol  
VCC  
Parameter  
Supply Voltage (OUT to GND)  
REF to GND  
Rating  
Unit  
V
-0.3 to 5.5  
-0.3 to VOUT +0.3  
-0.3 to VOUT +0.3  
-0.8 to 0.2  
VREF  
VSW  
IOUT  
V
Switch Voltage (LX to GND)  
Output Current (OUT)  
V
A
ISW  
Switch Current (LX)  
-0.8 to 0.2  
A
TST  
Storage Temperature Range  
Operation Temperature Range  
-65 to +150  
-40 to +85  
oC  
oC  
TOP  
Electrical Characteristics  
( VIN = 2V, FB = VOUT, RL = ∞, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C )  
Symbol  
Parameter  
Conditions  
Min.  
Typ.  
Max.  
Unit  
Minimum Input Voltage  
Operating Voltage  
-
0.9  
-
-
V
V
VIN  
TA = +25°C  
TA = +25°C,  
RL = 3kΩ (Note 3)  
1.1  
5.5  
Start-Up Voltage  
-
0.9  
1.1  
V
Start-Up Voltage Tempco  
Output Voltage Range  
-
2
100  
-4  
-
150  
-
5.5  
-
mV/°C  
V
FB = VOUT = 3.3V  
VIN = 2.4V, FB = GND,  
Steady-State Output Current  
(Note 4)  
IOUT  
mA  
-
80  
-
VOUT = 5V  
VREF  
VOUT  
Reference Voltage  
Output Voltage  
IREF = 0  
FB = VOUT  
FB = GND  
1.196  
3.17  
4.8  
1.22  
3.3  
5
1.244  
3.43  
5.2  
V
V
TEMPCO  
VREF_LOAD  
Reference Voltage Tempco  
Reference Voltage Load  
Regulation  
Reference Voltage Line  
Regulation  
Internal NFET, PFET  
On-Resistance  
LX Switch Current Limit  
(NFET)  
-
0.05  
-
mV/°C  
mV  
IREF = 0 to 20 µA  
VIN = 1.1V to 3.6V  
ILX = 100mA  
-
-
15  
80  
1.5  
1.0  
0.4  
VREF_LINE  
RDS (ON)  
0.08  
0.6  
mV/V  
ꢀ
-
ILIM  
0.3  
0.35  
A
ILEAK  
LX Leakage Current  
Operating Current into OUT  
VLX = 0, 5.5V; VOUT = 5.5V  
VOUT = 3.3V  
-
-
0.05  
16  
1
35  
µA  
µA  
Shutdown Current into OUT  
-
0.1  
1
µA  
SHDN = GND  
Efficiency  
LX Switch On-Time  
LX Switch Off-Time  
VOUT = 3.3V, ILOAD = 100mA  
-
3
1.0  
90  
4
1.2  
-
7
1.4  
%
µs  
µs  
tON  
tOFF  
= 0 or VOUT  
VSHDN  
-
0.07  
50  
nA  
SHDN Input Current  
SHDN Input Voltage  
ISHDN  
VIL  
VIH  
-
-
-
0.2  
-
Based on VOUT Voltage  
VOUT  
0.8  
Note: 3. Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 external diode between the input and output.  
4. Steady-state output current indicates that the device maintains output voltage regulation under load.  
AP1603 Rev. 1  
3 of 8  
NOVEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP1603  
STEP-UP DC/DC CONVERTER  
Typical Application Circuit  
(1) VOUT = 5V  
22uH  
1.1V to 5.5V  
VIN  
+
47uF  
ON  
LX  
OUT  
OFF  
SHDN  
REF  
Fixed Output  
( 5V )  
+
47uF  
GND  
FB  
0.1uF  
(2) VOUT = 3.3V  
22uH  
1.1V to 3.6V  
VIN  
+
47uF  
ON  
OFF  
LX  
SHDN  
REF  
Fixed Output  
( 3.3V )  
OUT  
+
47uF  
GND  
FB  
0.1uF  
(3) VOUT = Adj  
22uH  
1.1V to 5.5V  
VIN  
+
47uF  
ON  
LX  
OUT  
OFF  
SHDN  
REF  
Output  
47uF  
+
R2  
R1  
GND  
FB  
0.1uF  
R2  
VOUT = VREF (1+  
)
R1  
AP1603 Rev. 1  
4 of 8  
www.diodes.com  
NOVEMBER 2006  
© Diodes Incorporated  
AP1603  
STEP-UP DC/DC CONVERTER  
Typical Performance Characteristics  
STEADY STATE OUTPUT CURRENT  
vs.  
REFERENCE VOLTAGE vs.  
TEMPERATURE  
1.23  
INPUT VOLTAGE  
400  
1.22  
1.21  
1.2  
320  
240  
160  
80  
1.19  
1.18  
0
1
1.2 1.4 1.6 1.8  
2 2.2 2.4 2.6 2.8 3  
-40  
-20  
0
20  
40  
60  
80  
INPUT VOLTAGE (V)  
TEMPERATURE (oC)  
START-UP VOLTAGE vs.  
LOAD CURRENT  
NO LOAD INPUT CURRENT vs.  
INPUT VOLTAGE  
175  
150  
125  
100  
75  
2
1.8  
1.6  
1.4  
1.2  
1
with diode  
1N5819  
without diode  
50  
0.8  
0
3
9
18  
39  
59  
79  
99  
LOAD CURRENT (mA)  
INPUT VOLTAGE (V)  
AP1603 Rev. 1  
5 of 8  
www.diodes.com  
NOVEMBER 2006  
© Diodes Incorporated  
AP1603  
STEP-UP DC/DC CONVERTER  
Typical Performance Characteristics ( Continued )  
EFFICIENCY vs.  
EFFICIENCY vs.  
INPUT VOLTAGE = 2.4V  
INPUT VOLTAGE = 1.2V  
92.00  
91.00  
90.00  
91.00  
90.00  
89.00  
88.00  
87.00  
86.00  
85.00  
84.00  
83.00  
82.00  
89.00  
88.00  
87.00  
86.00  
85.00  
84.00  
83.00  
82.00  
81.00  
80.00  
INPUT VOLTAGE = 1.2 (V)  
INPUT VOLTAGE = 2.4 (V)  
SHUTDOWN CURRENT  
vs. SUPPLY VOLTAGE  
SHUTDOWN THRESHOLD VOLTAGE  
vs. SUPPLY VOLTAGE  
1
0.8  
0.6  
0.4  
0.2  
0
1.6  
1.4  
1.2  
1
0.8  
0.6  
0.4  
0.2  
0
-0.2  
-0.4  
-0.6  
-0.8  
-1  
1
2
3
4
1
1.5  
2
2.5  
3
3.5  
4
SUPPLY VOLTAGE (V)  
SUPPLY VOLTAGE (V)  
AP1603 Rev. 1  
6 of 8  
NOVEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP1603  
STEP-UP DC/DC CONVERTER  
Function Description  
General Description  
Inductor Selection  
AP1603 PFM (Pulse Frequency Modulation) converter IC series  
To operate as an efficient energy transfer element, the inductor  
must fulfill three requirements. First, the inductance must be low  
enough for the inductor to store adequate energy under the  
worst-case condition of minimum input voltage and switch ON  
time. Second, the inductance must also be high enough so the  
maximum current rating of AP1603 and inductor are not  
exceeded at the other worst-case condition of maximum input  
voltage and ON time. Lastly, the inductor must have sufficiently  
low DC resistance so excessive power is not lost as heat in the  
windings. But unfortunately this is inversely related to physical  
size. Minimum and Maximum input voltage, output voltage and  
output current must be established before an inductor can be  
selected.  
combine  
a switch mode converter, power MOSFET, and  
precision voltage reference in a single monolithic device. They  
offer both extreme low quiescent current, high efficiency, and  
very low gate threshold voltage to ensure start-up with low  
battery voltage (0.9V typ.). Designed to maximize battery life in  
portable products, and minimize switching losses by only  
switching as needed to service the load. PFM converters transfer  
a discrete amount of energy per cycle and regulate the output  
voltage by modulating switching frequency with the constant  
turn-on time. Switching frequency depends on the load, input  
voltage, and inductor value, and it can range up to 150KHz. The  
SW on resistance is typically 1 to 1.5 W to minimize switch losses.  
When the output voltage drops, the error comparator enables  
150KHz oscillator that turns on the MOSFET around 7.5us and  
2.5ms off time. Turning on the MOSFET allows inductor current  
to ramp up, storing energy in a magnetic field and when MOSFET  
turns off that force inductor current through the diode to the  
output capacitor and load. As the stored energy is depleted, the  
current ramp down until the diode turns off. At this point, inductor  
may ring due to residual energy and stray capacitance. The  
output capacitor stores charge when current flow through the  
diode is high, and release it when the current flow is low, thereby  
maintaining a steady voltage across the load. As the load  
increases, the output capacitor discharges faster and the error  
comparator initiates cycles sooner, increasing the switching  
frequency. The maximum duty cycle ensures adequate time for  
energy transfer to output during the second half of each cycle.  
Depending on the circuit, PFM converter can operate in either  
discontinuous mode or continuous conduction mode. Continuous  
conduction mode means that the inductor current does not ramp  
to zero during each cycle.  
Capacitor Selection  
A poor choice for an output capacitor can result in poor efficiency  
and high output ripple. Ordinary aluminum electrolyzers, while  
inexpensive, may have unacceptably poor ESR and ESL. There  
is a low ESR aluminum capacitor for switch mode DC-DC  
converters which work much better than the general purpose unit.  
Tantalum capacitors provide still better performance at more  
expense. OS-CON capacitors have extremely low ESR in a small  
size. If capacitance is reduced, the output ripple will increase.  
Most of the input supply is supplied by the input bypass capacitor.  
The capacitor voltage rating should be at least 1.25 times greater  
than a maximum input voltage.  
Marking Information  
(1) SOT26  
6
1
5
4
3
XX : Identification code  
Y : Year: 0-9  
XX Y M  
M : Month: A~L  
2
Part Number  
Package  
Identification Code  
AP1603W  
SOT26  
EY  
AP1603 Rev. 1  
7 of 8  
NOVEMBER 2006  
www.diodes.com  
© Diodes Incorporated  
AP1603  
STEP-UP DC/DC CONVERTER  
Package Information  
Package Type: SOT26  
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  
agreeto hold DiodesIncorporatedand all the companieswhose productsare represented onour website, harmlessagainst all damages.  
LIFE SUPPORT  
Diodes Incorporated productsare notauthorizedfor use ascriticalcomponentsin lifesupportdevices or systemswithout theexpressed written approval ofthe  
PresidentofDiodesIncorporated.  
AP1603 Rev. 1  
8 of 8  
NOVEMBER 2006  
www.diodes.com  
© Diodes Incorporated  

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