APW7323/A
3.2A, 5V, 1MHz Synchronous Buck Converter
Features
•
•
•
•
•
•
•
•
•
High Efficiency up to 94%
Adjustable Output Voltage from 0.8V to V
PVDD
Operating from 2.9 to 6V Supply
Integrated 85mΩ High Side / 75mΩ Low Side
MOSFETs
Low Dropout Operation: 100% Duty Cycle
Stable with Low ESR Ceramic Capacitors
Current up to 3.2A
Power-On-Reset Detection on VCC and VIN
Model Selection :
APW7323 : Automatic PFM/PWM
APW7323A : Forced PWM
General Description
APW7323/A is a synchronous buck converters with inte-
grated 85mΩ high side and 75mΩ low side power
MOSFETs. The APW7323/A with a current-mode control
scheme can convert wide input voltage of 2.9V to 6V to
the output voltage adjustable from 0.8V to 6V to provide
excellent output voltage regulation.
The APW7323/A is equipped with an automatic Skip/PWM
mode operation. At light load , the IC operates in the Skip
mode to reduce the switching losses. At heavy load, the
IC works in PWM mode.
The APW7323/A is also equipped with Power-on-reset,
soft start, soft-stop, and whole protections (under-voltage,
over-voltage, over-temperature and current-limit) into a
single package.
This device, available in SOP-8P and TDFN3x3-10
packages, provides a very compact system solution ex-
ternal components and PCB area.
•
•
•
•
•
•
•
•
•
Integrate Soft-Start and Soft-Stop
Over-Temperature Protection
Over-Voltage Protection
Under-Voltage Protection
High/ Low Side Current Limit
Power Good Indication
Enable/Shutdown Function
Available in SOP-8P and TDFN3x3-10 Package
Lead Free and Green Devices Available
(RoHS Compliant)
Simplified Application Circuit
V
IN
C2
R3
VIN
VCC
ON
POK
L1
LX
R1
V
OUT
C4
Applications
•
•
•
•
•
Notebook Computer & UMPC
LCD Monitor/TV
Set-Top Box
DSL, Switch HUBr
Portable Instrument
OFF
C3
APW7323/A
FB
EN
GND PGND
R2 C1
(optional)
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.5 - Aug., 2013
1
www.anpec.com.tw
APW7323/A
Pin Configuration
VCC 1
POK 2
GND 3
FB 4
SOP-8P
(Top View)
Exposed Pad
(connected to GND plane for better heat dissipation
EP
8
7
6
5
VIN
LX
PGND
EN
EN
PGND
PGND
LX
LX
1
2
3
4
5
EP
10
9
8
7
6
FB
GND
POK
VCC
VIN
TDFN3x3-10
(Top View)
Exposed Pad
(connected to GND plane for better heat dissipation)
Ordering and Marking Information
APW7323
APW7323A
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
KA: SOP-8P
QB : TDFN3x3-10
Operating Ambient Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
APW7323 KA:
APW7323
XXXXX
XXXXX - Date Code
APW7323 QB:
7 323
XXXXX
732 3A
XXXXX
APW
APW
XXXXX - Date Code
APW7323A KA:
APW7323A
XXXXX
XXXXX - Date Code
APW7323A QB:
XXXXX - Date Code
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).
Absolute Maximum Ratings
(Note 1)
Symbol
V
IN
, V
CC
V
LX
VIN and VCC Input Voltage
>20ns
LX to GND Voltage
FB, EN, POK to GND Voltage
P
D
T
J
T
STG
T
SDR
Power Dissipation
Junction Temperature
Storage Temperature
Maximum Lead Soldering Temperature(10 Seconds)
<20ns
Parameter
Rating
-0.3 ~ 7
-1 ~V
IN
+0.3
V
PGND
-5V ~9V
-0.3 ~ 6.5
Internally Limited
150
-65 ~ 150
260
V
W
o
o
o
Unit
V
V
C
C
C
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.5 - Aug., 2013
2
www.anpec.com.tw
APW7323/A
Thermal Characteristics
Symbol
θ
JA
Junction-to-Case Resistance in Free Air (Note 3)
θ
JC
SOP-8P
TDFN3x3-10
12
6
o
Parameter
Junction-to-Ambient Resistance in Free Air (Note 2)
SOP-8P
TDFN3x3-10
Typical Value
50
Unit
o
C/W
C/W
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 and TDFN3x3-10 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 package.
Recommended Operating Conditions
(Note 4)
Symbol
V
CC
V
IN
V
OUT
L
C
OUT
I
OUT
T
A
T
J
VCC Supply Voltage
VIN Supply Voltage
Converter Output Voltage
Inductance
Output Capacitor
Converter Output Current
Ambient Temperature
Junction Temperature
Parameter
Range
2.9~ 6
2.6~6
0.8~6
1~4.7
10~220
0~3.2
-40 ~ 85
-40 ~ 125
Unit
V
V
V
µH
µF
A
o
o
C
C
Note 4: Refer to the typical application circuit.
Electrical Characteristics
Unless otherwise specified, these specifications apply over V
CC
=V
IN
=5V, V
OUT
=3.3V and T
A
=-40~85
o
C. Typical values
are at T
A
=25
o
C.
Symbol
SUPPLY CURRENT
I
VCC
I
VCC_SD
VCC Supply Current
VCC Shutdown Supply Current
V
FB
=0.7V
EN=GND
-
-
460
-
-
40
µA
µA
Parameter
Test Conditions
Min.
APW7323/A
Typ.
Max.
Unit
POWER-ON-RESET (POR)
VCC POR Voltage Threshold
VCC POR Voltage Hysteresis
VCC Debounce Time
VIN POR Voltage Threshold
VIN POR Voltage Hysteresis
REFERENCE VOLTAGE
V
REF
Reference Voltage
All temperature
Output Accuracy
I
OUT
=10mA~3A, V
CC
=2.9~5V
-
-1
-1.5
0.8
-
-
-
+1
+1.5
V
%
%
V
IN
Rising
V
IN
Falling
V
CC
Rising
V
CC
Falling
-
-
-
-
-
2.7
200
10
2.3
50
-
-
-
-
-
V
mV
µs
V
mV
Copyright
©
ANPEC Electronics Corp.
Rev. A.5 - Aug., 2013
3
www.anpec.com.tw
APW7323/A
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over V
CC
=V
IN
=5V, V
OUT
=3.3V and T
A
=-40~85
o
C. Typical values
are at T
A
=25
o
C.
Symbol
Parameter
Test Conditions
Min.
OSCILLATOR and DUTY CYCLE
F
OSC
Oscillator Frequency
Maximum Converter’ Duty
s
Minimum on Time
POWER MOSFET
High Side P-MOSFET Resistance
Low Side N-MOSFET Resistance
CURRENT -MODE PWM CONVERTER
Gm
Error Amplifier Transconductance
Error Amplifier DC Gain
Current Sense Resistance
T
D
Dead Time
COMP=NC
-
-
-
-
680
50
400
20
-
-
-
-
µA/V
dB
mΩ
ns
V
CC
=V
IN
=5V, I
LX
=0.5A, T
A
=25
o
C
V
CC
=V
IN
=5V, I
LX
=0.5A, T
A
=25 C
o
APW7323/A
Typ.
Max.
Unit
0.85
V
FB
=0.7V
-
-
1
100
70
1.15
-
-
MHz
%
ns
-
-
85
75
115
105
mΩ
mΩ
PROTECTIONS
I
LIM
T
OTP
High Side MOSFET Current-Limit
Over-temperature Trip Point
(Re-softstart after OTP)
Over-Temperature Hysteresis
Over- Voltage Protection Threshold
OVP Debounce Time
Under-Voltage Protection Threshold
UVP Debounce Time
Low Side Switch Current-Limit
From Drain to Source
Peak Current
4.2
-
-
120
-
45
-
-
5.4
160
50
125
3
50
3
-1.9
6.6
-
-
130
-
55
-
-
A
°C
°C
%V
REF
µs
%V
REF
µs
A
SOFT-START, ENABLE and INPUT CURRENTS
Soft Start time
EN Enable Threshold Voltage
EN Threshold Hysteresis
EN Pull High Resistance
POWER GOOD
POK in from lower
(POK goes high)
POK Threshold
POK low hysteresis
POK in from higher
(POK goes high)
POK high hysteresis
POK Pull Low Resistance
POK Low-to-High Debounce Time
85
-
110
-
-
-
87.5
5
112.5
5
1
0.5
90
-
115
-
-
-
%V
OUT
%V
OUT
%V
OUT
%V
OUT
kΩ
ms
V
EN
Rising
-
0.8
-
-
2.5
-
0.2
300
-
1.3
-
-
ms
V
V
KΩ
Copyright
©
ANPEC Electronics Corp.
Rev. A.5 - Aug., 2013
4
www.anpec.com.tw
APW7323/A
Pin Description
Pin
NO.
SOP-8P
1
TDFN3x3-10
7
VCC
Signal Input. VCC supplies the control circuitry, gate drivers. Connecting a ceramic bypass
capacitor from VCC to GND to eliminate switching noise and voltage ripple on the input to
the IC.
Power Good Output. This pin is open-drain logic output that is
pulled to ground when the output voltage is not within
±
12.5% of regulation point. The POK
pin, if used, needs an external pull high resistor in the range of 30kΩ~100kΩ.
Ground. Power and signal ground.
Output Feedback Input. The APW7323/A senses the feedback voltage via FB and
regulates the voltage at 0.8V. Connecting FB with a resistor-divider from the converter’
s
output sets the output voltage.
Enable Input. EN is a digital input that turns the regulator on or off. Driving the EN high
turns on the regulator, otherwise, driving it low turns it off. The EN pin is internally pulled
high via a 300kΩ resistor.
Power Switching Output. LX is the Junction of the high-side and low-side Power MOSFETs
to supply power to the output LC filter.
Power Input. VIN supplies the step-down converter switches.
Function
Name
2
3
4
8
9
10
POK
GND
FB
5
6
7
8
9
1
2,3
4,5
6
11
EN
PGND Power Ground.
LX
VIN
Exposed Exposed pad. Connect the exposed pad to the system ground plan with large copper area
Pad
for dissipating heat into the ambient air.
Copyright
©
ANPEC Electronics Corp.
Rev. A.5 - Aug., 2013
5
www.anpec.com.tw
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