Diodes AP1603WG Schematic [ru]
A
P1603
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.
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)
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.
Pin Assignments
GND
REF
Applications
• Pagers
• Cameras
• Wireless Microphones
• Pocket Organizers
• Battery Backup Suppliers
• Portable Instruments
( Top View )
1
AP1603
2
3
SOT26
6
SHDNFB
5
OUT
7
LX
4
Typical Applications Circuit
OUT
= 5V
(1) V
1.1V to 5.5V
V
IN
+
ON
OFF
0.1uF
AP1603
Document number: DS31131 Rev. 4 - 2
47uF
SHDN
REF
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GND
1 of 8
22uH
LX
OUT
FB
+
47uF
Fixed Output
( 5V )
February 2014
© Diodes Incorporated
A
Typical Applications Circuit (cont.)
(2) V
OUT
= 3.3V
1.1V to 3.6V
V
ON
IN
OFF
+
47uF
0.1uF
SHDN
REF
GND
22uH
LX
OUT
FB
+
47uF
P1603
Fixed Output
( 3.3V )
(3) V
OUT
= ADJ
1.1V to 5.5V
V
IN
+
47uF
ON
OFF
SHDN
REF
0.1uF
V
OUT
= V
(1+ )
REF
R2
R1
Pin Descriptions
Pin Name Function
FB Feedback.
GND Ground.
REF 1.2V Reference Voltage. Bypass with a 0.1F capacitor.
LX N-Channel and P-Channel Power MOSFET Drain.
OUT Power Output. OUT provides bootstrap power to the IC.
SHDN
Shutdown Input. Drive high (>80% of V
shutdown mode. Connect to OUT for normal operation.
OUT
Functional Block Diagram
22uH
LX
+
47uF
Output
GND
OUT
FB
R2
R1
) for operating mode. Drive low (<20% of V
OUT
) for
SHDN
Minimum
Off-Time
One-Shot
Maximum
On-Time
One-Shot
TRIG
One-Shot
Q
One-Shot
S
Q
AP1603
Document number: DS31131 Rev. 4 - 2
TRIG
F/F
R
V
-
Zero
Crossing
EN
+
Amplifier
P
-
+
-
+
N
Error
Amplifier
FB connects to
Vcc or GND
FB connects to
external feedback
resistors
Q
+
Current-Limit
Amplifier
-
OUT
0.1uF
+
47uF
V
LX
22uH
GND
FB
0.1uF
+
47uF
IN
+
2 of 8
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February 2014
© Diodes Incorporated
A
P1603
Absolute Maximum Ratings (@T
= +25°C, unless otherwise specified.)
A
Symbol Parameter Rating Unit
VCC
V
REF
VSW
I
OUT
ISW
TST
TOP
Supply Voltage (OUT to GND) -0.3 to 5.5 V
REF to GND
Switch Voltage (LX to GND)
Output Current (OUT) -0.8 to 0.2 A
-0.3 to V
-0.3 to V
OUT
OUT
Switch Current (LX) -0.8 to 0.2 A
Storage Temperature Range -65 to +150 °C
Operation Temperature Range -40 to +85 °C
+0.3
+0.3
V
V
Electrical Characteristics (V
=2V, FB =V
IN
, RL =, TA = 0°C to +85°C, unless otherwise specified. Typical Values @ TA = +25°C)
OUT
Symbol Parameter Conditions Min Typ Max Unit
Minimum Input Voltage — 0.9 — V
VIN
Start-Up Voltage
Operating Voltage
TA = +25°C
T
= +25°C,
A
RL = 3k (Note 4)
Start-Up Voltage Tempco
1.1 — 5.5 V
—
—
0.9 1.1 V
-4 — mV/°C
Output Voltage Range 2 — 5.5 V
100 150
— 80
1.196 1.22 1.244 V
3.17 3.3 3.43
—
—
—
0.05 — mV/°C
15 80 mV
0.08 1.5 mV/V
— 0.6 1.0
—
0.05 1 µA
— 16 35 µA
—
—
0.1 1 µA
90 — %
— 0.07 50 nA
— —
0.8
0.2
—
—
V
I
V
OUT
REF
OUT
Steady-State Output Current (Note 5)
Reference Voltage
Output Voltage
FB = V
V
IN
V
OUT
I
REF
FB = V
FB = GND 4.8 5 5.2
= 3.3V
OUT
= 2.4V, FB = GND,
= 5V
= 0
OUT
TEMPCO Reference Voltage Tempco
V
REF_LOAD
V
REF_LINE
R
DS (ON)
I
LIM
I
LEAK
Operating Current into OUT
Shutdown Current into OUT
Efficiency
tON
t
OFF
I
SHDN
VIL
VIH
Notes: 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.
Reference Voltage Load Regulation
Reference Voltage Line Regulation
Internal NFET, PFET On-Resistance
LX Switch Current Limit (NFET) 0.3 0.35 0.4 A
LX Leakage Current
I
= 0 to 20A
REF
V
= 1.1V to 3.6V
IN
I
= 100mA
LX
V
= 0, 5.5V; V
LX
V
= 3.3V
OUT
OUT
= 5.5V
SHDN = GND
V
= 3.3V, I
OUT
LX Switch On-Time 3 4 7 µs
LX Switch Off-Time 1.0 1.2 1.4 µs
SHDN Input Current
SHDN Input Voltage
Based on V
V
SHDN
= 0 or V
LOAD
OUT
= 100mA
OUT
Voltage
—
—
mA
V
V
OUT
AP1603
Document number: DS31131 Rev. 4 - 2
3 of 8
www.diodes.com
February 2014
© Diodes Incorporated
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