AP1602BYL [ANACHIP]
Step-Up DC/DC Converter; 升压型DC / DC转换器
| 型号： | AP1602BYL |
| 厂家： | 
ANACHIP CORP |
| 描述： | Step-Up DC/DC Converter |
| 文件： | 总7页 (文件大小：164K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1602
Step-Up DC/DC Converter
Features
General Description
-A Guaranteed Start-Up from less than 0.9 V.
-High Efficiency.
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.
-Low Quiescent Current.
-Less Number of External Components needed.
-Low Ripple and Low Noise.
-Space Saving Packages: SOT89-5
Applications
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.
-Pagers.
-Cameras.
-Wireless Microphones.
-Pocket Organizers.
-Battery Backup Suppliers.
-Portable Instruments.
Pin Assignments
Pin Descriptions
Pin No.
Pin
1
OUT
5
REF
Description
Name
A
B
1.2V Reference Voltage. Bypass
with a 0.1µF capacitor.
AP1602A
REF
1
3
2
3
GND
Power Output. OUT provides
bootstrap power to the IC.
N-Channel and P-Channel Power
MOSFET Drain
OUT
5
4
SHDN
LX
4
LX
4
2
5
2
GND
Ground
1
2
LX
5
FB
Shutdown Input. Drive high
(>80% of VOUT) for operating
AP1602B
SOT89-5L
GND
3
-
-
mode. Drive low (<20% of VOUT)
SHDN
FB
for shutdown mode. Connect to
OUT for normal operation.
Feedback pin
REF 3
OUT
4
1
Ordering Information
AP1602 X X X X
Version
A: A version
B: B version
Package
Lead Free
Blank : Normal
L : Lead Free Package
Packing
Blank : Tube
Y: SOT89-5L
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
Block Diagram
0.1uF
47uF
Zero
OUT
Minimum
Off-Time
Crossing
Amplifier
EN
SHDN
One-Shot
Q
TRIG
One-Shot
P
N
VIN
47uF
LX
22uH
F/F
S
Q
GND
R
Maximum
On-Time
One-Shot
Current-Limit
Amplifier
TRIG
Q
FB
One-Shot
Error
Amplifier
REF
0.1uF
Absolute Maximum Ratings
Symbol
VCC
Parameter
Supply Voltage (OUT to GND)
REF to GND
Rating
-0.3 to 5.5
-0.3 to VOUT+0.3
-0.3 to VOUT+0.3
-0.8 to 0.8
Unit
V
V
V
A
VREF
VSW
IOUT
Switch Voltage (LX to GND)
Output Current (OUT)
ISW
TST
TOT
Switch Current (LX)
Storage Temperature Range
Operation Temperature Range
-0.8 to 0.8
-65 to +150
-40 to +80
A
oC
oC
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Apr. 14, 2004
2/7
AP1602
Step-Up DC/DC Converter
Electrical Characteristics
(RL = ∞, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
Symbol
Parameter
Minimum Input Voltage
Operating Voltage
Conditions
Min.
-
Typ.
0.9
-
Max.
-
Unit
V
VIN
TA = +25°C
1.1
5.5
V
TA = +25°C,
Start-Up Voltage
-
0.9
1.1
V
RL = 3kΩ (Note 1)
Start-Up Voltage Tempco
Output Voltage Range
Steady-State Output Current
(Note2)
-
-2
-
-
mV/°C
V
2
5.5
IOUT
(VOUT = 3.3V)
IREF=0
150
220
-
mA
VREF
VOUT
Reference Voltage
Output Voltage
1.176
3.17
-
1.2
3.3
1.224
3.43
-
V
V
TEMPCO
Reference Voltage Tempco
Reference Voltage Load
Regulation
0.024
mV/°C
IREF=0 to 80 μA
VIN=1.1V to 3.6V
ILX=100mA
VREF_LOAD
VREF_LINE
RDS(ON)
-
15
0.08
0.3
30
mV
mV/V
Ω
Reference Voltage Line
Regulation
-
2.5
Internal NFET, PFET
On-Resistance
-
0.6
LX Switch Current Limit
(NFET)
ILIM
0.4
0.5
0.65
A
μA
µA
ILEAK
LX Leakage Current
Operating Current into OUT
VLX=0, 5.5V; VOUT=5.5V
VOUT=3.3V
-
-
0.05
16
1
35
Shutdown Current into OUT
-
0.1
1
µA
SHDN =GND
VOUT=3.3V, ILOAD=200mA
Efficiency
-
90
-
%
µs
µs
tON
LX Switch On-Time
LX Switch Off-Time
3
4
7
tOFF
0.8
1
1.2
=0 or VOUT
VSHDN
-
-
0.07
50
nA
SHDN Input Current
ISHDN
VIL
-
0.2
Based on VOUT Voltage
VOUT
SHDN Input Voltage
VIH
0.8
-
-
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
22uH
1.1V to 3.6V
VIN
+
100uF
ON
LX
SHDN
REF
OFF
Optional
Fixed Output
( 3.3V )
OUT
+
GND
0.1uF
220uF
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Apr. 14, 2004
3/7
AP1602
Step-Up DC/DC Converter
Typical Performance Characteristics
REFERENCE OUTPUT VOLTAGE
MAXIMUM OUTPUT CURRENT
v.s. TEMPERATURE
v.s. INPUT VOLTAGE (VOUT=3.3V)
1.21
600
1.2
1.19
1.18
1.17
1.16
1.15
1.14
500
400
300
200
100
0
-40 -20
0
20
40
60
80
100
1
1.2 1.4 1.6 1.8
2 2.2 2.4 2.6 2.8 3
TEMPERATURE (°C)
INPUT VOLTAGE (V)
NO-LOAD BATTERY CURRENT
v.s.
Without Diode
With Diode
START-UP VOLTAGE
v.s. LOAD CURRENT
INPUT BATTERY VOLTAGE
1.8
1.6
1.4
1.2
1
160
140
120
100
80
0.8
0.6
0.4
0.2
0
60
40
20
0
0.5
1
1.5
2
2.5
3
0.01
0.1
1
10
100
INPUT BATTERY VOLTAGE (V)
LOAD CURRENT (mA)
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Apr. 14, 2004
4/7
AP1602
Step-Up DC/DC Converter
Typical Performance Characteristics (Continued)
VIN=1.2V
VIN=2.4V
SHUTDOWN CURRENT
v.s. SUPPLY VOLTAGE
EFFICIENCY vs. LOAD CURRENT
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
1
2
3
4
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
SHUTDOWN THRESHOLD VOLTAGE
v.s. SUPPLY VOLTAGE
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
1
1.5
2
2.5
3
3.5
4
SUPPLY VOLTAGE (V)
Marking Information
Appendix
Identification
XX : Identification code
Part Number
Package
1
2
3
5
Code
EZ
(See Appendix)
AP1602A
AP1602B
SOT89-5
SOT89-5
XX
Y
: Year: 0-9
ET
M
: Month: A~L
YM X
X
: Blank: Normal
4
L: Lead Free Package
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Apr. 14, 2004
5/7
AP1602
Step-Up DC/DC Converter
Function Descriptions
General Description
Diode Selection
AP1602 PFM (pulse frequency modulation) Speed, forward drop, and leakage current are the
converter IC series combine a switch mode three main considerations in selecting a rectifier diode.
converter, power MOSFET, and precision voltage Best performance is obtained with Schottky rectifier
reference in a single monolithic device. They offer diode, such as 1N5819. Motorola makes MBR0530 in
both extreme low quiescent current, high efficiency, surface mount. For lower output power a 1N4148 can
and very low gate threshold voltage to ensure be used although efficiency and start up voltage will
start-up with low battery voltage (0.9V typ.). suffer substantially.
Designed to maximize battery life in portable
products, and minimize switching losses by only
switching as needed service the load. PFM
converters transfer a discrete amount of energy
Inductor Selection
To operate as an efficient energy transfer element,
the inductor must fulfill three requirements. First, the
per cycle and regulate the output voltage by inductance must be low enough for the inductor to
modulating switching frequency with the constant
turn-on time. Switching frequency depends on load,
input voltage, and inductor value, and it can range
up to 100KHz. The SW on resistance is typically 1
to 1.5 W to minimize switch losses. When the
output voltage drops, the error comparator enables
100KHz oscillator that turns on the MOSFET
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
maximum current rating of AP1602 and inductor are
not exceed at the other worst case condition of
maximum input voltage and ON time. Lastly, the
inductor must have sufficiently low DC resistance so
around 7.5us and 2.5ms off time. Turning on the excessive power is not lost as heat in the windings.
MOSFET allows inductor current to ramp up,
storing energy in a magnetic field and when
But unfortunately this is inversely related to physical
size. Minimum and Maximum input voltage, output
MOSFET turns off that force inductor current voltage and output current must be established before
through 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 flowing through the diode is high, and
release it when current 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 ensure adequate time for energy
transfer to output during the second half each
cycle. Depending on circuit, PFM converter can
operate in either discontinuous mode or
and inductor can be selected.
Capacitor Selection
A poor choice for a output capacitor can result in poor
efficiency and high output ripple. Ordinary aluminum
electrolyzers,
while
inexpensive
may
have
unacceptably poor ESR and ESL. There are low ESR
aluminum capacitors for switch mode DC-DC
converters which work much better than general
propose unit. Tantalum capacitors provide still better
performance at more expensive. OS-CON capacitors
have extremely low ESR in
a small size. If
capacitance is reduced, 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.
continuous
conduction
mode.
Continuous
conduction mode means that the inductor current
does not ramp to zero during each cycle.
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Apr. 14, 2004
6/7
AP1602
Step-Up DC/DC Converter
Package Information
Package Type: SOT89-5L
A
C
D
F
B
E
K
J
F
L
I
H
G
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
4.40
4.05
1.50
1.30
2.40
0.80
Nom.
4.50
4.15
1.60
1.40
Max.
4.60
4.25
1.70
1.50
2.60
-
Min.
Nom.
0.177
0.163
0.063
0.055
Max.
A
B
C
D
E
F
G
H
I
0.173
0.159
0.059
0.051
0.094
0.031
0.181
0.167
0.067
0.059
0.102
-
2.50
-
0.098
-
3.00 Ref.
1.50 Ref.
0.46
0.118 Ref.
0.059 Ref.
0.018
0.40
1.40
0.35
0.52
1.60
0.43
0.016
0.055
0.014
0.020
0.063
0.017
J
K
L
1.50
0.059
0.39
0.015
5o Typ.
5o Typ.
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Apr. 14, 2004
7/7
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