AP1623SL [ANACHIP]
PWM Control Step-Down Switching Regulator-Converter; PWM控制的降压型开关稳压器，转换器
| 型号： | AP1623SL |
| 厂家： | 
ANACHIP CORP |
| 描述： | PWM Control Step-Down Switching Regulator-Converter |
| 文件： | 总6页 (文件大小：183K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1623
PWM Control Step-Down Switching Regulator-Converter
Features
General Description
- Low current consumption:
In operation: 60µA max.
AP1623 consists of CMOS step-down switching
regulator-controllers with PWM control. These devices
include a reference voltage source, oscillation circuit,
error amplifier, internal PMOS and etc.
Power off: 0.5µA max.
- Input voltage: 2.5V to 16V.
- Output voltage: 1.8V & Adjustable to 6V.
- Duty ratio: 0% to 100% PWM control
- Oscillation frequency: 180KHz typ.
- Soft-start function: 8ms typ.
- With a power-off function.
AP1623 provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM
control circuit is able to very the duty ratio linearly
from 0 up to 100. This converter also contains an
error amplifier circuit as well as a soft-start circuit that
prevent s overshoot at startup.
- Built-in internal SW P-channel MOS
- SOP-8L Package.
With the addition of an internal P-channel Power MOS,
a coil, capacitors, and a diode connected externally,
these ICs can function as step-down switching
regulators. They serve as ideal power supply units for
portable devices when coupled with the SOP–8L
mini-package, providing such outstanding features as
low current consumption. Since this converter can
accommodate an input voltage of up to 16V, it is also
ideal when operating via an AC adapter.
Applications
- On-board power supplies of battery devices for
portable telephones, electronic notebooks, PDA,
and other hand-held sets.
- Power supplies for audio equipment, including
portable CD players and headphone stereo
equipment.
- Fixed voltage power supply for cameras, video
equipment and communications equipment.
- Power supplies for microcomputers.
- Conversion from four Ni-H or Ni-Cd cells or two
lithium-ion cells to 3.3V/3V.
- Conversion of AC adapter input to 5V/3V.
Pin Assignments
Pin Descriptions
Name
VOUT
Description
Output voltage monitoring pin
Pin
1
Power-off pin
H: Normal operation
(Step-down operation)
L: Step-down operation
stopped
Vss
Vss
SW
V
OUT
1
2
3
4
8
7
6
5
ON/OFF
2
ON/OFF
(All circuits deactivated)
AP1623
VCC
3
4
IC signal power supply pin
V
CC
PVCC
IC power supply pin
PVCC
SW
Switch Pin. Connect external
inductor/diode here. Minimize
trace area at this pin to reduce
EMI.
5、6
7、8
SW
VSS
GND Pin
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 Feb 10, 2004
1/6
AP1623
PWM Control Step-Down Switching Regulator-Converter
Ordering Information
AP 1623 X
X
X
Lead Free
Packing
Package
S: SOP-8L
Blank : Normal
Blank : Tube
L : Lead Free Package A : Taping
Block Diagram
L
SW
PVCC
Oscillation
Circuit
Reference Voltage
Source with Soft Start
V
CC
R
V
OUT
+
-
PWM-Switched
Control Circuit
+
SD
COUT
V
IN
C
PVCC
C
VCC
VON/OFF
V
SS
ON/OFF
Absolute Maximum Ratings
Symbol
VCC
Parameter
Rating
VSS - 0.3 to VSS + 18
VSS - 0.3 to VSS + 18
SS - 0.3 to VSS + 18
SS - 0.3 to VSS + 18
VSS - 0.3 to VIN + 0.3
800
Unit
V
V
V
V
*1
VCC pin voltage
PVCC pin voltage
VOUT pin voltage
ON/OFF pin voltage
Switch pin voltage
PVCC
VOUT
VON/OFF
V
V
*1
VSW
PD
TOPR
TSTG
V
Power dissipation
mW
oC
oC
Operating temperature range
Storage temperature range
-20 to +85
-20 to +125
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
Anachip Corp.
www.anachip.com.tw
Rev. 0.1 Feb 10, 2004
2/6
AP1623
PWM Control Step-Down Switching Regulator-Controllers
Electrical Characteristics (VIN = 5V, Ta=25°C, unless otherwise specified)
Symbol
Parameter
Conditions
Min.
Typ.
Max. Unit
VOUT(S)
VOUT(S)
V
VOUT(E) Output voltage *1
-
VOUT(S)
×0.976
×1.024
VIN
Input voltage
Switch Current
AP1623 Series
Duty = 50%
2.5
3
--
--
16
--
V
A
I
SW
ISS1
ISSS
Current consumption 1
Current consumption during power off VON/OFF =0V
VOUT=VOUT(S) ×1.2
--
--
--
35
--
30
60
0.5
60
µA
µA
mV
∆VOUT1 Line regulation
VIN=VOUT(S) ×1.2 to ×1.4 *2
Load current=10µA to IOUT(See
∆VOUT2 Load regulation
∆VOUT
--
--
30
60
--
mV
below) ×1.25
±VOUT(S)
Output voltage temperature coefficient Ta= -40°C to 85°C
V/°C
/∆Ta
×5E-5
Measure
153
144
1.8
180
180
--
207
216
--
VOUT(S)≥ 2.5V
fOSC
Oscillation frequency
KHz
V
waveform at
VOUT(S)≤ 2.4V
SW pin
VSH
VSL
Evaluate oscillation at SW pin
Power-Off pin input voltage
Evaluate oscillation stop at SW
--
--
0.3
pin
--
ISH
ISL
TSS
-0.1
-0.1
4.0
--
--
--
8.0
93
0.1
0.1
16.0
--
µA
µA
ms
%
Power-Off pin input leakage current
Soft-Start time
--
--
EFFI Efficiency
Conditions:
VIN = 5V, VOUT = 2.5V IOUT = 1A
The recommended components are connected to the IC, unless otherwise indicated. VIN=VOUT(S) ×1.2[V],
IOUT=120[mA] (VIN=2.5V, if VOUT(S) ≤ 2.0V.)
Peripheral components:
Coil
: Sumida Electric Co., Ltd. CD54 (47µH).
Diode
Capacitor
: Matsushita Electronics Corporation MA720(Schottky type).
: Matsushita Electronics Corporation TE (16V, 22µF tantalum type).
The power-off pin is connected to VIN.
Notes:
The output voltage indicated above represents a typical output voltage set up. These specifications apply in
common to AP1623, unless otherwise noted.
*1 VOUT(S) Specified output voltage value.
VOUT(E) Actual output voltage value.
*2 VIN=2.5V to 2.94V, if VOUT(S) ≤ 2.0V.
Anachip Corp.
www.anachip.com.tw
Rev. 0.1 Feb 10, 2004
3/6
AP1623
PWM Control Step-Down Switching Regulator-Controllers
Typical Application Circuit
（1） Normal Application
OUT
SW
PVCC
CC
RA
RB
R
VCC
VOUT
AP1623
+
-
V
CC
R1
R2
PWM-Switched
Control Circuit
+
D1
CVCC
-
Reference Voltage
Source with
Oscillation
Circuit
Soft Start
ON/OFF
VSS
（2） Application with Short Circuit Protection
V
IN : 3.3V~16V
VOUT : 1.8V
PVCC
SW
D
VCC
1N4148 for above 5V Vin and
CC
RA
RB
Schottky for below 5V Vin
AP1623
V
CC
VOUT
R
ON/OFF
1M
C
ON/OFF
0.33uF
+
ON/OFF
VSS
C
OUTPUT
100uF
-
D1
R
Bias
4.7M
R
SENCE
47K
C
PVCC
100uF 0.1uF
C
VCC
Test Circuit
open
SW
open
SW
A
VCC
PVCC
VOUT
VCC
VOUT
PVCC
+
-
A
ON/OFF
ON/OFF
VSS
VSS
SW
VOUT
VCC
PVCC
+
-
+
-
V
ON/OFF
VSS
Anachip Corp.
www.anachip.com.tw
Rev. 0.1 Feb 10, 2004
4/6
AP1623
PWM Control Step-Down Switching Regulator-Controllers
Function Description
PWM Control (AP1623 Series)
The AP1623 consists of DC/DC converters that
employ a pulse-width modulation (PWM) system.
In converters of the AP1623, the pulse width varies
in a range from 0 to 100, according to the load
current, and yet ripple voltage produced by the
switching can easily be removed through a filter
because the switching frequency remains constant.
Therefore, these converters provide a low-ripple
power over broad ranges of input voltage and load
current.
the voltage value of the output OUT and the output
voltage value (VOUT) of the IC are brought to one
other, the more the output voltage remains immune
to deviations in the absolute accuracy of externally
connected resistances RA and RB and the absolute
value of internal resistances R1 and R2 in the IC.
In particular, to suppress the influence of deviations
in internal resistances R1 and R2 in the IC, a major
contributor to deviations in the output OUT, the
external resistances RA and RB must be limited to a
much smaller value than that of internal resistances
R1 and R2 in the IC.
External adjustment of output voltage
The AP1623 allows the user to select 3 types of the
output voltage, when external resistances RA, RB,
and capacitor CC are added, as illustrated in Typical
On the other hand, a reactive current flows through
external resistances RA and RB. This reactive
current must be reduced to a negligible value with
respect to the load current in the actual use of the
IC so that the efficiency characteristics will not be
degraded. This requires that the value of external
resistance RA and RB be made sufficiently large.
However, too large a value (more than 1 MΩ) for
the external resistances RA and RB would make the
IC vulnerable to external noise. Check the influence
of this value on actual equipment.
Application Circuit. Moreover,
a
temperature
gradient can be obtained by inserting
a
thermal-resistor or other element in series with RA
and RB.
Therefore, the output voltage (OUT) is determined
by the output voltage value VOUT of the AP1623,
and the ratio of the parallel resistance value of
external resistance RB and internal resistance R1 +
R2 of the IC, to external resistance RA. The output
voltage is expressed by the following equation:
OUT = VOUT + VOUT × RA ÷ (RB // (R1+ R2))
There is a tradeoff between the voltage accuracy of
the output OUT and the reactive current. This
should be taken into consideration based on the
requirements of the intended application.
(Note:// denotes a combined resistance in parallel.)
The voltage accuracy of the output OUT set by
resistances RA and RB is not only affected by the
IC’s output voltage accuracy (VOUT ± 2.4%), but also
by the absolute precision of external resistances RA
and RB in use and the absolute value deviations of
internal resistances R1 and R2 in the IC.
Deviations in the absolute value of internal
resistances R1 and R2 in the IC vary with the
output voltage of the AP1623, and are broadly
classified as follows:
. Output voltage 2.5V → 4.44MΩ to 27.0MΩ
Let us designate the maximum deviations of the
absolute value of external resistances RA and RB by
RAmax and RBmax, respectively, the minimum
deviations by RAmin and RBmin, respectively, and
the maximum and minimum deviations of the
absolute value of internal resistances R1 and R2 in
the IC by (R1+ R2)max and (R1+ R2)min,
respectively. Then, the minimum deviation value
OUTmin and the maximum deviation value
OUTmax of the output voltage OUT are expressed
by the following equations:
. Output voltage 3.3V → 3.60MΩ to 23.3MΩ
. Output voltage 5.0V → 2.45MΩ to 2.45MΩ
When a value of R1+R2 given by the equation
indicated below is taken in calculating the voltage
value of the output OUT, a median voltage deviation
will be obtained for the output OUT.
R1 + R2 = 2 ÷ ( 1 ÷ maximum deviation in absolute
value of internal resistances R1 and R2 in IC + 1 ÷
minimum deviation in absolute value of internal
resistances R1 and R2 of IC)
Moreover, add a capacitor CC in parallel to the
external resistance RA in order to avoid output
oscillations and other types of instability.
OUTmin = VOUT × 0.976 + VOUT × 0.976 × RAmin ÷
(RBmax// (R1+ R2)max)
OUTmax = VOUT × 1.024 + VOUT × 1.024 × RAmax ÷
(RBmin// (R1+ R2)min)
Make sure that CC is larger than the value given by
the following equation:
The voltage accuracy of the output OUT cannot be
made higher than the output voltage accuracy (VOUT
± 2.4%) of the IC itself, without adjusting the
external resistances RA and RB involved. The closer
C (F)
RA
(Ω)×7.5kHz)
≥1÷ (2×π ×
C
If a large CC-value is selected, a longer soft-start
time than the one set up in the IC will be set.
Anachip Corp.
www.anachip.com.tw
Rev. 0.1 Feb 10, 2004
5/6
AP1623
PWM Control Step-Down Switching Regulator-Controllers
Marking Information
( Top View )
8
5
Logo
AC
Part no.
AP1623
Blank: normal
L: Lead Free Package
YY WW X X
ID code: internal
Xth week: 01~52
Year: "01" =2001
"02" =2002
1
4
SOP-8L
Package Information
Package Type: SOP-8L
L
VIEW "A"
0.015x45
D
7 (4X)
7 (4X)
e
B
VIEW "A"
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
A
A1
A2
B
1.40
0.10
1.30
0.33
0.19
4.80
3.70
1.60
1.75
0.25
1.50
0.51
0.25
5.30
4.10
0.055
0.040
0.051
0.013
0.0075
0.189
0.146
0.063
0.069
0.100
0.059
0.020
0.010
0.209
0.162
−
−
1.45
0.41
0.20
5.05
3.90
1.27
5.99
0.71
0.057
0.016
0.008
0.199
0.154
0.050
0.236
0.028
C
D
E
e
−
−
−
−
H
L
5.79
6.20
1.27
0.10
8O
0.228
0.244
0.050
0.004
8O
0.38
0.015
−
−
−
−
−
−
0O
0O
θ
Anachip Corp.
www.anachip.com.tw
Rev. 0.1 Feb 10, 2004
6/6
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