APW7324
4A,5V, 500KHz Synchronous Buck Converter
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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High Efficiency up to 94%
- Automatic Skip/PWM Mode Operation
Adjustable Output Voltage from 0.8V to V
IN
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 4A
Power-On-Reset Detection on VCC and VIN
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 Packages
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
APW7324 is a synchronous buck converters with inte-
grated 85mΩ high side and 75mΩ low side power
MOSFETs. The APW7324 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 APW7324 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 APW7324 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.
Simplified Application Circuit
V
IN
C2
R3
VCC
C3
ON
OFF
VIN
POK
L1
LX
R1
V
OUT
C4
Applications
•
•
•
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Notebook Computer & UMPC
LCD Monitor/TV
Set-Top Box
DSL, Switch HUBr
Portable Instrument
APW7324
FB
EN
GND PGND
R2 C1
(optional)
Pin Configuration
VCC 1
POK 2
GND 3
FB 4
8 VIN
7 LX
6 PGND
5 EN
EN 1
NC 2
PGND 3
LX 4
LX 5
10 FB
9 GND
8 POK
7 VCC
6 VIN
SOP-8P
(Top View)
TDFN3x3-10
(Top View)
Exposed Pad (connected to GND plane
for better heat dissipation
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.4 - Aug., 2013
1
www.anpec.com.tw
APW7324
Ordering and Marking Information
APW7324
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
APW7324 KA:
APW7324
XXXXX
XXXXX - Date Code
APW7324 QB:
APW
7324
XXXXX
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
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)
Parameter
Rating
-0.3 ~ 7
-1 ~V
CC
+0.3
-0.3 ~ 6.5
Internally Limited
150
-65 ~ 150
260
Unit
V
V
V
W
o
o
o
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
Thermal Characteristics
Symbol
θ
JA
θ
JC
Parameter
Junction-to-Ambient Resistance in Free Air (Note 2)
Junction-to-Case Resistance in Free Air (Note 3)
Typical Value
50
10
Unit
o
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 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.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2013
2
www.anpec.com.tw
APW7324
Recommended Operating Conditions
(Note 4)
Symbol
V
CC
V
IN
V
OUT
I
OUT
T
A
T
J
VCC Supply Voltage
VIN Supply Voltage
Converter Output Voltage
Converter Maximum Output Current
Ambient Temperature
Junction Temperature
Parameter
Range
2.9~ 6
2.5~6
0.8~6
4
-40 ~ 85
-40 ~ 125
Unit
V
V
V
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
-
-
20
µA
µA
Parameter
Test Conditions
Min.
APW7324
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
OSCILLATOR and DUTY CYCLE
F
OSC
Oscillator Frequency
Maximum Converter’ Duty
s
Minimum on Time
POWER MOSFET
High Side MOSFET Resistance
Low Side MOSFET Resistance
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
V
CC
Rising
V
CC
Falling
-
-
-
2.7
200
10
2.3
50
-
-
-
-
-
V
mV
µs
V
mV
V
IN
Rising
V
IN
Falling
-
-
-
-1
-1.5
0.8
-
-
-
+1
+1.5
V
%
%
I
OUT
=10mA~3A, V
CC
=2.9~5V
425
V
FB
=0.7V
-
-
500
100
70
575
-
-
KHz
%
ns
-
-
85
75
115
105
mΩ
mΩ
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2013
3
www.anpec.com.tw
APW7324
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.
Symbo
Parameter
Test Conditions
Min.
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
APW7324
Typ.
Max.
Unit
PROTECEIONS
I
LIM
T
OTP
High Side MOSFET current-limit
Over-temperature Trip Point
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
5
-
-
120
-
45
-
-1.6
6
160
50
125
3
50
3
-1.9
7
-
-
130
-
55
-
-2.2
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
ΚΩ
ms
V
EN
Rising
-
0.8
-
-
2.5
-
0.15
300
-
1.3
-
-
ms
V
V
KΩ
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2013
4
www.anpec.com.tw
APW7324
Typical Operating Characteristics
Efficiency vs. Output Current
100
VCC Supply Current vs. VCC
Supply Voltage
600
VCC Supply Current, I
VCC
(µA)
95
90
500
400
300
200
100
0
Efficiency(%)
85
80
75
70
65
60
0.001
V
OUT
=3.3V
V
OUT
=1.2V
V
IN
=5V
0.01
0.1
1
10
V
CC
=5V, V
IN
=5V, V
OUT
=3.3V,
No Load, T
A
=25
o
C
2.5
3
3.5
4
4.5
5
5.5
6
Output Current, I
OUT
(A)
VCC Supply Voltage (V)
High Side MOSFET Current Limit
Threshold vs. VIN Voltage
4.5
120
On-Resistance vs. VIN Voltage
115
110
105
100
95
90
85
80
75
70
2.5
3
3.5
4
4.5
5
5.5
6
High Side MOSFET Current Limit
Threshold, I
LIM
(Α)
On- Resistance, R
DS(ON)
(mΩ)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.5
3
3.5
4
4.5
5
5.5
6
T
A
=25
o
C
P-MOSFET
N-MOSFET
VIN Voltage,V
VIN
(V)
VIN Voltage, V
VIN
(V)
Reference Voltage vs. Output Current
0.85
0.84
Reference Voltage, V
REF
(V)
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
0
0.5
1
1.5
2
2.5
3
3.5
4
Output Current, I
OUT
(A)
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Aug., 2013
5
www.anpec.com.tw
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