AP1602
Step-Up DC/DC Converter
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
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
Applications
-Pagers.
-Cameras.
-Wireless Microphones.
-Pocket Organizers.
-Battery Backup Suppliers.
-Portable Instruments.
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.
Pin Assignments
1
2
3
74
5
LX
GND
OUT
REF
AP1602A
SHDN
1
2
3
74
5
OUT
GND
LX
FB
SOT89-5L
AP1602B
REF
Pin Descriptions
Pin No.
Pin
Name
A
B
Description
REF 1 3
1.2V Reference Voltage. Bypass
with a 0.1F capacitor.
OUT 5 4
Power Output. OUT provides
bootstrap power to the IC.
LX 4 5
N-Channel and P-Channel Power
MOSFET Drain
GND 2 2
Ground
SHDN
3 -
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.
FB - 1
Feedback
pin
Ordering Information
Package
AP1602 X X X X
Packing
Blank : Tube
A : Taping
Y: SOT89-5L
Lead Free
Blank : Normal
L : Lead Free Package
Version
A: A version
B: B version
AP1602
Step-Up DC/DC Converter
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Apr. 14, 2004
2/7
Block Diagram
+
-
+
-
S
Q
R
F/F
TRIG
One-Shot
Q
One-Shot
Q
TRIG
Maximum
On-Time
One-Shot
Error
Amplifier
Current-Limit
Amplifier
Zero
Crossing
Amplifier
Minimum
Off-Time
One-Shot
+
-
+
-
OUT
LX
GND
FB
REF
0.1uF
22uH
0.1uF
+
47uF
+
47uF
+
SHDN
P
N
V
IN
EN
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V
CC
Supply Voltage (OUT to GND)
-0.3 to 5.5
V
V
REF
REF to GND
-0.3 to V
OUT
+0.3 V
V
SW
Switch Voltage (LX to GND)
-0.3 to V
OUT
+0.3 V
I
OUT
Output
Current
(OUT) -0.8
to
0.8
A
I
SW
Switch
Current
(LX) -0.8
to
0.8
A
T
ST
Storage Temperature Range
-65 to +150
o
C
T
OT
Operation Temperature Range
-40 to +80
o
C
AP1602
Step-Up DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.0.1 Apr. 14, 2004
3/7
Electrical Characteristics
(R
L
= , T
A
= 0C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.)
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Minimum
Input
Voltage
- 0.9 - V
V
IN
Operating
Voltage
T
A
= +25C
1.1
-
5.5
V
Start-Up
Voltage
T
A
= +25C,
RL = 3k
(Note 1)
- 0.9 1.1 V
Start-Up
Voltage
Tempco
- -2 -
mV/C
Output Voltage Range
2
-
5.5
V
I
OUT
Steady-State Output Current
(Note2)
(V
OUT
= 3.3V)
150
220
-
mA
V
REF
Reference
Voltage
I
REF
=0 1.176
1.2
1.224
V
V
OUT
Output
Voltage
3.17 3.3 3.43 V
TEMPCO
Reference Voltage Tempco
-
0.024
-
mV/C
V
REF_LOAD
Reference Voltage Load
Regulation
I
REF
=0 to 80 A
- 15 30 mV
V
REF_LINE
Reference Voltage Line
Regulation
V
IN
=1.1V to 3.6V
-
0.08
2.5
mV/V
R
DS(ON)
Internal NFET, PFET
On-Resistance
I
LX
=100mA -
0.3
0.6
I
LIM
LX Switch Current Limit
(NFET)
0.4
0.5
0.65
A
I
LEAK
LX
Leakage
Current
V
LX
=0, 5.5V; V
OUT
=5.5V -
0.05
1
A
Operating Current into OUT
V
OUT
=3.3V -
16
35
A
Shutdown Current into OUT
SHDN
=GND
- 0.1 1 A
Efficiency
V
OUT
=3.3V, I
LOAD
=200mA - 90 - %
t
ON
LX
Switch
On-Time
3 4 7 s
t
OFF
LX
Switch
Off-Time
0.8 1 1.2 s
I
SHDN
SHDN
Input Current
V
SHDN
=0 or V
OUT
- 0.07 50 nA
V
IL
-
-
0.2
V
IH
SHDN
Input Voltage
Based on V
OUT
Voltage
0.8 - -
V
OUT
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
SHDN
LX
OUT
REF
0.1uF
22uH
220uF
+
100uF
+
V
IN
ON
OFF
Fixed Output
( 3.3V )
GND
1.1V to 3.6V
Optional
AP1602
Step-Up DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.0.1 Apr. 14, 2004
4/7
Typical Performance Characteristics
REFERENCE OUTPUT VOLTAGE
v.s. TEMPERATURE
1.14
1.15
1.16
1.17
1.18
1.19
1.2
1.21
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
REFERENCE OUTPUT
VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
v.s. INPUT VOLTAGE (V
OUT
=3.3V)
0
100
200
300
400
500
600
1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3
INPUT VOLTAGE (V)
MAXIMUM OUTPUT
CURRENT (mA)
START-UP VOLTAGE
v.s. LOAD CURRENT
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0.01
0.1
1
10
100
LOAD CURRENT (mA)
START-UP
VOLTAGE (V)
Without Diode
With Diode
NO-LOAD BATTERY CURRENT
v.s.
INPUT BATTERY VOLTAGE
0
20
40
60
80
100
120
140
160
0.5
1
1.5
2
2.5
3
INPUT BATTERY VOLTAGE (V)
INPUT BATTERY
CURRENT (uA)
AP1602
Step-Up DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.0.1 Apr. 14, 2004
5/7
Typical Performance Characteristics (Continued)
EFFICIENCY vs. LOAD CURRENT
0
10
20
30
40
50
60
70
80
90
100
0.1
1
10
100
1000
LOAD CURRENT (mA)
EFFICIENCY (%
)
VIN=1.2V
VIN=2.4V
SHUTDOWN CURRENT
v.s. SUPPLY VOLTAGE
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1
2
3
4
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT
(uA)
SHUTDOWN THRESHOLD VOLTAGE
v.s. SUPPLY VOLTAGE
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1
1.5
2
2.5
3
3.5
4
SUPPLY VOLTAGE (V)
SHUTDOWN
THRESHOLD VOLTAGE
(V)
Marking Information
1
2
3
5
7
4
XX
YM
X
XX : Identification code
(See Appendix)
Y : Year: 0-9
M : Month: A~L
X : Blank: Normal
L: Lead Free Package
Appendix
Part Number
Package
Identification
Code
AP1602A SOT89-5
EZ
AP1602B SOT89-5
ET
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