AP1603
STEP-UP DC-DC CONVERTER
Description
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.
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.
Pin Assignments
( Top View )
FB 1
GND 2
REF 3
SOT26
AP1603
6 SHDN
5 OUT
7 LX
4
Features
•
•
•
•
•
•
•
•
•
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 Package: SOT26
Available in Green molding
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
•
•
•
•
•
•
Pagers
Cameras
Wireless Microphones
Pocket Organizers
Battery Backup Suppliers
Portable Instruments
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
(1) V
OUT
= 5V
1.1V to 5.5V
V
IN
ON
22uH
+
47uF
OFF
SHDN
REF
0.1uF
GND
LX
OUT
FB
+
47uF
Fixed Output
( 5V )
AP1603
Document number: DS31131 Rev. 4 - 2
1 of 8
www.diodes.com
February 2014
© Diodes Incorporated
AP1603
Typical Applications Circuit
(cont.)
(2) V
OUT
= 3.3V
1.1V to 3.6V
V
IN
ON
22uH
+
47uF
OFF
SHDN
REF
0.1uF
GND
LX
OUT
FB
+
47uF
Fixed Output
( 3.3V )
(3) V
OUT
= ADJ
1.1V to 5.5V
V
IN
ON
22uH
+
47uF
SHDN
REF
0.1uF
LX
OUT
GND
FB
R2
OFF
+
Output
47uF
R1
V
OUT
= V
REF
(1+
R2
R1
)
Pin Descriptions
Pin Name
FB
GND
REF
LX
OUT
Function
Feedback.
Ground.
1.2V Reference Voltage. Bypass with a 0.1μF capacitor.
N-Channel and P-Channel Power MOSFET Drain.
Power Output. OUT provides bootstrap power to the IC.
Shutdown Input. Drive high (>80% of V
OUT
) for operating mode. Drive low (<20% of V
OUT
) for
shutdown mode. Connect to OUT for normal operation.
SHDN
Functional Block Diagram
SHDN
Minimum
Off-Time
One-Shot
Q TRIG
One-Shot
EN
Zero
Crossing
Amplifier
P
V
OUT
0.1uF
+
47uF
LX
+
22uH
47uF
V
IN
+
-
+
S
Maximum
On-Time
One-Shot
TRIG Q
One-Shot
F/F
Q
R
N
+
-
+
-
Current-Limit
Amplifier
FB connects to
Vcc or GND
GND
AP1603
Document number: DS31131 Rev. 4 - 2
2 of 8
www.diodes.com
-
+
Error
Amplifier
FB connects to
external feedback
resistors
FB
0.1uF
February 2014
© Diodes Incorporated
AP1603
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
CC
V
REF
V
SW
I
OUT
I
SW
T
ST
T
OP
REF to GND
Switch Voltage (LX to GND)
Output Current (OUT)
Switch Current (LX)
Storage Temperature Range
Operation Temperature Range
Parameter
Supply Voltage (OUT to GND)
Rating
-0.3 to 5.5
-0.3 to V
OUT
+0.3
-0.3 to V
OUT
+0.3
-0.8 to 0.2
-0.8 to 0.2
-65 to +150
-40 to +85
Unit
V
V
V
A
A
°C
°C
Electrical Characteristics
(V
IN
=2V, F
B
=V
OUT
, R
L
=∞, T
A
= 0°C to +85°C, unless otherwise specified. Typical Values @ T
A
= +25°C)
Symbol
V
IN
Parameter
Minimum Input Voltage
Operating Voltage
Start-Up Voltage
Start-Up Voltage Tempco
Output Voltage Range
FB = V
OUT
= 3.3V
I
OUT
V
REF
V
OUT
TEMPCO
V
REF_LOAD
V
REF_LINE
R
DS (ON)
I
LIM
I
LEAK
Steady-State Output Current (Note 5)
Reference Voltage
Output Voltage
Reference Voltage Tempco
Reference Voltage Load Regulation
Reference Voltage Line Regulation
Internal NFET, PFET On-Resistance
LX Switch Current Limit (NFET)
LX Leakage Current
Operating Current into OUT
Shutdown Current into OUT
Efficiency
t
ON
t
OFF
LX Switch On-Time
LX Switch Off-Time
V
LX
= 0, 5.5V; V
OUT
= 5.5V
V
OUT
= 3.3V
I
REF
= 0 to 20μA
V
IN
= 1.1V to 3.6V
I
LX
= 100mA
V
IN
= 2.4V, FB = GND,
V
OUT
= 5V
I
REF
= 0
FB = V
OUT
FB = GND
T
A
= +25°C
T
A
= +25°C,
RL = 3kΩ (Note 4)
Conditions
Min
—
1.1
—
—
2
100
—
1.196
3.17
4.8
—
—
—
—
0.3
—
—
—
—
3
1.0
Typ
0.9
—
0.9
-4
—
150
80
1.22
3.3
5
0.05
15
0.08
0.6
0.35
0.05
16
0.1
90
4
1.2
0.07
—
—
Max
—
5.5
1.1
—
5.5
—
—
1.244
3.43
5.2
—
80
1.5
1.0
0.4
1
35
1
—
7
1.4
50
0.2
—
mA
V
V
mV/°C
mV
mV/V
Ω
A
µA
µA
µA
%
µs
µs
nA
V
OUT
Unit
V
V
V
mV/°C
V
SHDN
= GND
V
OUT
= 3.3V, I
LOAD
= 100mA
I
SHDN
V
IL
V
IH
Notes:
SHDN
Input Current
SHDN
Input Voltage
V
SHDN
= 0 or V
OUT
—
—
0.8
Based on V
OUT
Voltage
4. Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 external diode between the input and output.
5. Steady-state output current indicates that the device maintains output voltage regulation under load.
AP1603
Document number: DS31131 Rev. 4 - 2
3 of 8
www.diodes.com
February 2014
© Diodes Incorporated
AP1603
Typical Performance Characteristics
Reference Voltage vs. Temperature
1.23
400
Steady Stage Output Current vs.
Input Voltage
Steady Stage Output
Current (mA)
Reference Voltage (V)
1.22
1.21
1.20
1.19
1.18
-40
-20
0
20
40
60
80
320
240
160
80
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Temperature (°C)
Input Voltage (V)
Start-up Voltage vs. Load Current
2.0
w ith diode
1N5819
w ithout diode
175
No Load Input Current vs.
Input Voltage
Start-up Voltage (V)
1.8
1.6
1.4
1.2
1.0
0.8
0
No Load Input Current (uA)
150
125
100
75
50
3
9
18
39
59
79
99
Load Current (mA)
Input Voltage (V)
AP1603
Document number: DS31131 Rev. 4 - 2
4 of 8
www.diodes.com
February 2014
© Diodes Incorporated
AP1603
Typical Performance Characteristics
Efficiency vs. Load Current
91
90
89
V
IN
= 1.2V
V
OUT
= 3.3V
(cont.)
Efficiency vs. Load Current
92
91
90
89
88
87
86
85
84
83
82
81
80
V
IN
= 2.4V
V
OUT
= 3.3V
Efficiency (%)
88
87
86
85
84
83
82
Efficiency (%)
2.
89
7.
94
17
.8
6
27
.9
37
.9
47
.9
57
.9
67
.9
77
.6
87
.7
97
.6
Load Current (mA)
Shoutdown Current vs. Supply Voltage
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
1
2
3
4
Shutdown Current (uA)
Shutdown Threshold
Voltage (V)
Supply Voltage (V)
AP1603
Document number: DS31131 Rev. 4 - 2
5 of 8
www.diodes.com
2.
91
27
.9
57
.9
87
.6
11
7.
6
14
7.
6
17
7.
5
20
8
23
8
26
8
29
8
Load Current (mA)
Shutdown Threshold Voltage
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Supply Voltage (V)
February 2014
© Diodes Incorporated
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