AP1602
Step-Up DC/DC Converter
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 Packages: SOT89-5
General Description
The AP1602 is a high efficiency step-up DC/DC
converter for applications using 1 to 2 NiMH battery
cells. Only three external components are required
to deliver a fixed output voltage of 3.3V. The
AP1602 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 100KHz (max.)
switching rate results in smaller passive
components. The space saving SOT89-5 packages
make the AP1602 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.
Pin Assignments
REF 1
GND 2
SHDN 3
AP1602A
7 LX
4
5 OUT
Pin Descriptions
Pin
Name
REF
OUT
LX
Pin No.
A
B
1
5
4
2
3
-
3
4
5
2
-
1
Description
1.2V Reference Voltage. Bypass
with a 0.1µF capacitor.
Power Output. OUT provides
bootstrap power to the IC.
N-Channel and P-Channel Power
MOSFET Drain
Ground
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.
Feedback pin
FB
1
AP1602B
5
LX
GND
GND 2
REF 3
SHDN
7 OUT
4
SOT89-5L
FB
Ordering Information
AP1602 X X X X
Version
A: A version
B: B version
Package
Y: SOT89-5L
Lead Free
Packing
Blank : Normal
Blank : Tube
L : Lead Free Package A : Taping
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. 0.1 Apr. 14, 2004
1/7
AP1602
Step-Up DC/DC Converter
Electrical Characteristics
(R
L
=
∞,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
Symbol
V
IN
Parameter
Minimum Input Voltage
Operating Voltage
Start-Up Voltage
Start-Up Voltage Tempco
Output Voltage Range
Steady-State Output Current
(Note2)
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
LX Switch On-Time
LX Switch Off-Time
SHDN
Input Current
Conditions
T
A
= +25°C
T
A
= +25°C,
RL = 3k
Ω
(Note 1)
Min.
-
1.1
-
-
2
Typ.
0.9
-
0.9
-2
-
220
1.2
3.3
0.024
15
0.08
0.3
0.5
0.05
16
0.1
90
4
1
Max.
-
5.5
1.1
-
5.5
-
1.224
3.43
-
30
2.5
0.6
0.65
1
35
1
-
7
1.2
Unit
V
V
V
mV/°C
V
mA
V
V
mV/°C
mV
mV/V
Ω
A
μA
µA
µA
%
µs
µs
I
OUT
V
REF
V
OUT
TEMPCO
(V
OUT
= 3.3V)
I
REF
=0
150
1.176
3.17
-
-
-
-
0.4
V
REF_LOAD
V
REF_LINE
R
DS(ON)
I
LIM
I
LEAK
I
REF
=0 to 80
μA
V
IN
=1.1V to 3.6V
I
LX
=100mA
V
LX
=0, 5.5V; V
OUT
=5.5V
V
OUT
=3.3V
SHDN
=GND
V
OUT
=3.3V, I
LOAD
=200mA
t
ON
t
OFF
-
-
-
-
3
0.8
I
SHDN
V
IL
V
IH
V
SHDN
=0 or V
OUT
-
-
0.8
0.07
-
-
50
0.2
-
nA
V
OUT
SHDN
Input Voltage
Based on V
OUT
Voltage
Note 1:
Start-up voltage operation is guaranteed with the addition of a Schottky
MBR0520
external diode between the input and output.
Note 2:
Steady-state output current indicates that the device maintains output voltage regulation under load.
Typical Application Circuit
1.1V to 3.6V
V
IN
ON
22uH
+
100uF
OFF
SHDN
REF
0.1uF
GND
LX
OUT
Optional
+
220uF
Fixed Output
( 3.3V )
Anachip Corp.
www.anachip.com.tw
3/7
Rev.0.1 Apr. 14, 2004
Analog electronics
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