APW8804
3A 5V 1MHz Synchronous Buck Converter
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
High Efficiency up to 95%
- Automatic PFM/PWM Mode Operation
Adjustable Output Voltage from 0.6V to V
PVDD
Integrated 65mΩ High Side / 55mΩ Low Side
MOSFETs
Low Dropout Operation: 100% Duty Cycle
Stable with Low ESR Ceramic Capacitors
Power-On-Reset Detection on VDD and PVDD
Integrated 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
Small TDFN3x3-10 and SOP-8P Packages
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
APW8804 is a 3A synchronous buck converter with inte-
grated 65mΩ high side and 55mΩ low side power
MOSFETs. The APW8804, design with a current-mode
control scheme, can convert wide input voltage of 2.6V to
6V to the output voltage adjustable from 0.6V to 6V to
provide excellent output voltage regulation.
The APW8804 is equipped with an automatic PFM/PWM
mode operation. At light load , the IC operates in the PFM
mode to reduce the switching losses. At heavy load, the
IC works in PWM mode. At PWM mode, the switching
frequency is set by the external resistor.
The APW8804 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 TDFN3x3-10 and SOP-8P, provides
a very compact system solution external components and
PCB area.
Simplified Application Circuit
V
IN
PVDD
LX
(option)
Applications
•
•
•
•
•
Notebook Computer & UMPC
LCD Monitor/TV
Set-Top Box
DSL, Switch HUBr
Portable Instrument
V
OUT
VDD
APW8804
POK
ON
OFF
EN
FB
GND
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 - Dec., 2012
1
www.anpec.com.tw
APW8804
Ordering and Marking Information
APW8804
Assembly Material
Handling Code
Temperature Range
Package Code
APW8804 KA :
APW8804
XXXXX
APW
8804
XXXXX
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
XXXXX - Date Code
APW8804 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).
Pin Configuration
APW8804
NC 1
LX 2
LX 3
POK 4
EN 5
10 PVDD
9 PVDD
8 VDD
7 NC
6 FB
LX
LX
POK
EN
1
2
3
4
APW8804
9
GND
8 PVDD
7 VDD
6 GND
5 FB
11
GND
TDFN 3X3-10
(Top View)
11
GND Exposed pad
SOP-8P
(Top View)
9
Exposed pad
GND
The pin 6 must be connected to the pin 9 (exposed pad)
Absolute Maximum Ratings
(Note 1)
Symbol
V
PVDD
, V
VDD
V
LX
Input Supply Voltage
LX to GND Voltage
POK, FB, EN to GND Voltage
P
D
T
J
T
STG
T
SDR
Power Dissipation
Junction Temperature
Storage Temperature
Maximum Lead Soldering Temperature, 10 Seconds
<30ns pulse width
>30ns pulse width
Parameter
Rating
-0.3 ~ 6.5
-3 ~V
PVDD
+3
-1 ~V
PVDD
+0.3
-0.3 ~ 6.5
2
150
-65 ~ 150
260
Unit
V
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.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Dec., 2012
2
www.anpec.com.tw
APW8804
Thermal Characteristics
Symbol
θ
JA
Parameter
Junction-to-Ambient Resistance in Free Air
(Note 2)
SOP-8P
TDFN3x3-10
Junction-to-Case Resistance in Free Air
(Note 3)
SOP-8P
TDFN3x3-10
20
10
60
50
Typical Value
Unit
o
C/W
θ
JC
o
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 or 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 SOP-8P or TDFN3x3-10 package.
Recommended Operating Conditions
(Note 4)
Symbol
V
VDD
V
PVDD
V
OUT
L
I
OUT
T
A
T
J
Parameter
Control and Driver Supply Voltage
Input Supply Voltage
Converter Output Voltage
Inductance
Converter Output Current
Ambient Temperature
Junction Temperature
Range
2.6~ 6
2~6
0.6~6
1~3.3
0~3
-40 ~ 85
-40 ~ 125
Unit
V
V
V
µH
A
o
C
C
o
Note 4: Refer to the typical application circuit.
Electrical Characteristics
Unless otherwise specified, these specifications apply over V
VDD
=V
PVDD
=5V, V
OUT
=3.3V, T
A
=25
o
C.
APW8804
Min.
SUPPLY CURRENT
I
VDD
VDD Supply Current
V
FB
=0.7V
EN=GND
-
-
460
-
-
1
µA
µA
Typ.
Max.
Symbo
Parameter
Test Conditions
Unit
I
VDD_SDH
VDD Shutdown Supply Current
POWER-ON-RESET (POR)
VDD POR Voltage Threshold
VDD POR Hysteresis
PVDD POR Voltage Threshold
PVDD POR Hysteresis
REFERENCE VOLTAGE
V
REF
Reference Voltage
V
VDD
Rising
2.3
-
1.5
-
2.4
0.2
1.7
0.2
2.5
-
1.9
-
V
V
V
V
-
All temperature
-1
-1.5
0.6
-
-
-
+1
+1.5
V
%
%
Output Accuracy
I
OUT
=10mA~3A, V
VDD
=2.6~5V
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Dec., 2012
3
www.anpec.com.tw
APW8804
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over V
VDD
=V
PVDD
=5V, V
OUT
=3.3V, T
A
=25
o
C.
APW8804
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
High/Low Side MOSFET Leakage
Current
CURRENT-MODE PWM CONVERTER
Gm
Error Amplifier Transconductance
Error Amplifier DC Gain
Current Sense Transresistance
T
D
Dead Time
COMP=NC
V
VDD
=5V, I
LX
=0.5A, T
A
=25
o
C
V
VDD
=5V, I
LX
=0.5A, T
A
=25
o
C
-
-
-
65
55
-
80
75
1
mΩ
mΩ
µA
V
FB
=0.7V
0.85
-
-
1
100
100
1.15
-
-
MHz
%
ns
Typ.
Max.
Symbo
Parameter
Test Conditions
Unit
-
-
-
-
550
80
400
20
-
-
-
-
µA/V
dB
mΩ
ns
PROTECTIONS
I
LIM
T
OTP
MOSFET Current-Limit
Over-Temperature Trip Point
Over-Temperature Hysteresis
Over-Voltage Protection Threshold
Under-Voltage Protection Threshold
SOFT-START, ENABLE, AND INPUT CURRENTS
Soft-Start Time
EN Enable Threshold
EN Shutdown Threshold
EN Pull Low Resistance
POK in from Lower
(POK Goes High)
POK Low Hysteresis
(POK Goes Low)
POK in from Higher
(POK Goes High)
POK High Hysteresis
(POK Goes Low)
Power Good Pull Low Resistance
V
EN
rising voltage to enable device
V
EN
falling voltage to shutdown
device
-
-
0.5
-
87
-
122
-
-
1
-
-
500
90
5
125
5
100
-
1.4
-
-
93
-
128
-
-
ms
V
V
kΩ
%V
OUT
%V
OUT
%V
OUT
%V
OUT
Ω
Peak Current
4
-
-
120
45
4.5
150
30
-
50
5
-
-
135
55
A
°C
°C
%V
REF
%V
REF
POK Threshold
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Dec., 2012
4
www.anpec.com.tw
APW8804
Typical Operating Characteristics
Refer to the “Typical Application Circuit”. The test condition is V
VDD
=5V, T
A
= 25
o
C unless otherwise specified.
Efficiency vs. Load Current
100
100
Efficiency vs. Load Current
90
Efficiency (%)
Efficiency (%)
90
80
V
VDD
=5V
80
70
70
V
VDD
=5V
V
VDD
=3.3V
60
V
OUT
=3.3V
60
V
OUT
=1.8V
50
0
1
2
Load Current, I
OUT
(A)
3
50
0
1
2
Load Current, I
OUT
(A)
3
Efficiency vs. Load Current
100
1.9
1.88
Output Voltage, V
OUT
(V)
Output Voltage vs. Load Current
90
Efficiency (%)
1.86
1.84
1.82
1.8
1.78
1.76
1.74
1.72
1.7
80
70
V
VDD
=5V
V
VDD
=3.3V
60
V
OUT
=1.05V
50
0
1
2
Load Current, I
OUT
(A)
3
0
0.5
1
1.5
2
Load Current, I
OUT
(A)
2.5
3
Supply Voltage vs. P-FET Current
Limit
6
P-FET Current Limit, I
LIM
(A)
5
4
3
2
1
0
2
3
4
5
Supply Voltage, V
VDD
(V)
6
Supply Voltage vs.
MOSFET On
Resistance
100
MOSFET On Resistance, R
ON
(mΩ)
90
80
70
60
50
40
30
20
10
0
2
3
4
5
Supply Voltage, V
VDD
(V)
6
P-FET
N-FET
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Dec., 2012
5
www.anpec.com.tw
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