APW7089
4A, 26V, 380kHz, Asynchronous Step-Down Converter
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Wide Input Voltage from 4.5V to 26V
Output Current up to 4A
Adjustable Output Voltage from 0.8V to 90% V
IN
- 0.8V Reference Voltage
-
±2.5%
System Accuracy
80mΩ Integrated P-Channel Power MOSFET
High Efficiency up to 91%
- Pulse-Skipping Mode (PSM) / PWM Mode Op-
eration
Current-Mode Operation
- Stable with Ceramic Output Capacitors
- Fast Transient Response
Power-On-Reset Monitoring
Fixed 380kHz Switching Frequency in PWM Mode
Built-in Digital Soft-Start
Output Current-Limit Protection with Frequency
Foldback
70% Under-Voltage Protection
Over-Temperature Protection
<5µA Quiescent Current During Shutdown
General Description
The APW7089 is a 4A, asynchronous, step-down con-
verter with integrated 80mΩ P-channel MOSFET. The
device, with current-mode control scheme, can convert
4.5~26V input voltage to the output voltage adjustable
from 0.8 to 90% V
IN
to provide excellent output voltage
regulation.
The APW7089 regulates the output voltage in automatic
PSM/PWM mode operation, depending on the output
current, for high efficiency operation over light to full load
current. The APW7089 is also equipped with power-on-
reset, soft-start, and whole protections (under-voltage,
over-temperature, and current-limit) into a single package.
In shutdown mode, the supply current drops below 5µA.
This device, available in a 8-pin SOP-8P package, pro-
vides a very compact system solution with minimal exter-
nal components and good thermal conductance.
100
90
80
V
OUT
=5V
V
OUT
=3.3V
Efficiency (%)
Thermal-Enhanced SOP-8P Package
Lead Free and Green Devices Available
(RoHS Compliant)
70
60
50
40
30
20
Applications
•
•
•
•
•
•
•
LCD Monitor / TV
Set-Top Box
Portable DVD
Wireless LAN
ADSL, Switch HUB
Notebook Computer
Step-Down Converters Requiring High Efficiency
and 4A Output Current
10
0.001
0.01
0.1
1
10
Output Current, I
OUT
(A)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
©
ANPEC Electronics Corp.
Rev. A.1 - Jan., 2012
1
www.anpec.com.tw
APW7089
Ordering and Marking Information
APW7089
Assembly Material
Handling Code
Temperature Range
Package Code
APW7089
XXXXX
Package Code
KA : SOP-8P
Operating Ambient Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
XXXXX - Date Code
APW7089 KA :
Note : ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020D for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Pin Configuration
VIN
EN
UGND
VCC
1
2
3
4
8
Simplified Application Circuit
GND
FB
COMP
LX
9
LX
7
6
5
C1
10µF
VIN
VCC UGND
C3
LX
C2
L1
4A
D1
R1
1%
R2
1%
V
IN
+12
SOP-8P
(Top View)
The Pin 5 must be connected to the Exposed Pad
U1
APW7089
V
IN
R4
C6
C5
EN
COMP
GND
FB
V
OUT
+3.3V
C4
22µF
C7
(Optional)
Absolute Maximum Ratings
Symbol
V
IN
V
LX
Parameter
VIN Supply Voltage (VIN to GND)
LX to GND Voltage
(Note 1)
Rating
-0.3 ~ 30
>
100ns
<
100ns
V
IN
>
6.2V
V
IN
≤
6.2V
-2 ~ V
IN
+0.3
-5 ~ V
IN
+6
-0.3 ~ 6.5
<
V
IN
+0.3
-0.3 ~ V
IN
+0.3
-0.3 ~ 7V
-0.3 ~ 20
-0.3 ~ V
CC
+0.3
150
-65 ~ 150
260
V
V
V
V
V
o
o
o
Unit
V
V
V
CC
V
UGND_GND
V
VIN_UGND
VCC Supply Voltage (VCC to GND)
UGND to GND Voltage
VIN to UGND Voltage
EN to GND Voltage
FB, COMP to GND Voltage
Maximum Junction Temperature
C
C
C
T
STG
T
SDR
Storage Temperature
Maximum Lead Soldering Temperature, 10 Seconds
Note1: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recom-
mended operating conditions" is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
Copyright
©
ANPEC Electronics Corp.
Rev. A.1 - Jan., 2012
2
www.anpec.com.tw
APW7089
Thermal Characteristics
Symbol
θ
JA
θ
JC
Parameter
Junction-to-Ambient Resistance in Free Air
(Note 2)
SOP-8P
Junction-to-Case Resistance in Free Air
(Note 3)
SOP-8P
Typical Value
50
10
Unit
o
C/W
C/W
o
Note 2:
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. The exposed pad
of SOP-8P is soldered directly on the PCB.
Note 3: The case temperature is measured at the center of the exposed pad on the underside of the SOP-8P package.
Recommended Operating Conditions
(Note 4)
Symbol
V
IN
VIN Supply Voltage
VCC Supply Voltage
V
OUT
I
OUT
Converter Output Voltage
Converter Output Current
VCC Input Capacitor
VIN-to-UGND Input Capacitor
T
A
T
J
Ambient Temperature
Junction Temperature
Parameter
Range
4.5 ~ 26
4.0 ~ 5.5
0.8 ~ 90% V
IN
0~4
0.22 ~ 2.2
0.22 ~ 2.2
-40 ~ 85
-40 ~ 125
Unit
V
V
V
A
µF
µF
o
o
C
C
Note 4: Refer to the typical application circuits.
Electrical Characteristics
Refer to the typical application circuits. These specifications apply over V
IN
=12V, V
OUT
=3.3V and T
A
= -40 ~ 85
o
C, unless
otherwise specified. V
CC
is regulated by an internal regulator. Typical values are at T
A
=25
o
C.
Symbol
SUPPLY CURRENT
I
VIN
I
VIN_SD
I
VCC
I
VCC_SD
VIN Supply Current
VIN Shutdown Supply Current
VCC Supply Current
VCC Shutdown Supply Current
V
FB
= 0.85V, V
EN
=3V, LX=Open
V
EN
= 0V, V
IN
=26V
V
EN
= 3V, V
CC
= 5.0V, V
FB
=0.85V
V
EN
= 0V, V
CC
= 5.0V
-
-
-
-
1.0
-
0.7
-
2.0
5
-
1
mA
µA
mA
µA
Parameter
Test Conditions
Min.
APW7089
Typ.
Max.
Unit
VCC 4.2V LINEAR REGULATOR
Output Voltage
Load Regulation
Current-Limit
VIN-TO-UGND 5.5V LINEAR REGULATOR
Output Voltage (V
VIN-UGND
)
Load Regulation
Current-Limit
V
IN
= 6.2 ~ 26V, I
O
= 0 ~ 10mA
I
O
= 0 ~ 10mA
V
IN
= 6.2 ~ 26V
5.3
-80
10
5.5
-60
-
5.7
0
30
V
mV
mA
V
IN
= 5.2 ~ 26V, I
O
= 0 ~ 8mA
I
O
= 0 ~ 8mA
V
CC
> POR Threshold
4.0
-60
8
4.2
-40
-
4.5
0
30
V
mV
mA
Copyright
©
ANPEC Electronics Corp.
Rev. A.1 - Jan., 2012
3
www.anpec.com.tw
APW7089
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over V
IN
=12V, V
OUT
=3.3V and T
A
= -40 ~ 85
o
C, unless
otherwise specified. V
CC
is regulated by an internal regulator. Typical values are at T
A
=25
o
C.
Symbol
Parameter
Test Conditions
Min.
POWER-ON-RESET (POR) AND LOCKOUT VOLTAGE THRESHOLDS
VCC POR Voltage Threshold
VCC POR Hysteresis
EN Lockout Voltage Threshold
EN Lockout Hysteresis
VIN-to-UGND Lockout Voltage
Threshold
VIN-to-UGND Lockout Hysteresis
REFERENCE VOLTAGE
V
REF
Reference Voltage
T
J
= 25
o
C, I
OUT
=0A, V
IN
=12V
Output Voltage Accuracy
Line Regulation
Load Regulation
OSCILLATOR AND DUTY
F
OSC
Free Running Frequency
Foldback Frequency
Maximum Converter’ Duty Cycle
s
Minimum Pulse Width of LX
CURRENT-MODE PWM CONVERTER
Gm
Error Amplifier Transconductance
Error Amplifier DC Gain
Current-Sense Resistance
P-channel Power MOSFET
Resistance
PROTECTIONS
I
LIM
V
UV
P-channel Power MOSFET
Current-limit
FB Under-Voltage Threshold
FB Under-Voltage Hysteresis
FB Under-Voltage Debounce
T
OTP
Over-Temperature Trip Point
Over-Temperature Hysteresis
SOFT-START, ENABLE, AND INPUT CURRENTS
t
SS
Soft-Start Interval
Preceding Delay before Soft-Start
EN Logic Low Voltage
V
EN
falling, V
IN
= 4 ~ 26V
9
9
-
10.8
10.8
-
12
12
0.8
ms
ms
V
Peak Current
V
FB
falling
5.0
66
-
-
-
-
6.5
70
40
2
150
50
8.0
74
-
-
-
-
A
%
mV
µs
o
o
APW7089
Typ.
Max.
Unit
V
CC
rising
3.7
-
3.9
0.15
2.5
0.2
3.5
0.2
4.1
-
2.7
-
-
-
V
V
V
V
V
V
V
EN
rising
2.3
-
V
VIN-UGND
rising
-
-
-
-1.0
-2.5
-
-
T
J
= -40 ~ 125
o
C, I
OUT
= 0 ~ 4A,
V
IN
= 4.5 ~ 26V
V
IN
= 4.5V to 26V, I
OUT
= 0A
I
OUT
= 0 ~ 4A
0.8
-
-
0.36
0.4
-
+1.0
V
%
+2.5
-
-
%
%
V
IN
= 4.5 ~ 26V
V
FB
= 0V
340
-
-
380
80
93
200
420
-
-
-
kHz
kHz
%
ns
µA/V
dB
Ω
mΩ
V
IN
= 4.5 ~ 26V
-
-
COMP = Open
60
-
Between VIN and Exposed Pad,
T
J
=25
o
C
-
400
80
0.12
80
-
-
-
100
C
C
Copyright
©
ANPEC Electronics Corp.
Rev. A.1 - Jan., 2012
4
www.anpec.com.tw
APW7089
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over V
IN
=12V, V
OUT
=3.3V and T
A
= -40 ~ 85
o
C, unless
otherwise specified. V
CC
is regulated by an internal regulator. Typical values are at T
A
=25
o
C.
Symbol
Parameter
Test Conditions
Min.
SOFT-START, ENABLE, AND INPUT CURRENTS (CONT.)
EN Logic High Voltage
EN Pin Clamped Voltage
P-channel Power MOSFET
Leakage Current
I
FB
I
EN
FB Pin Input Current
EN Pin Input Current
V
EN
rising, V
IN
= 4 ~ 26V
I
EN
=10mA
V
EN
= 0V, V
LX
= 0V, V
IN
= 26V
V
FB
= 0.8V
V
EN
< 3V
2.1
12
-
-100
-500
-
-
-
-
-
-
17
4
+100
+500
V
V
µA
nA
nA
APW7089
Typ.
Max.
Unit
Copyright
©
ANPEC Electronics Corp.
Rev. A.1 - Jan., 2012
5
www.anpec.com.tw
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