APW8802
High Input Voltage 8A PWM DC/DC Converter
Features
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•
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•
•
•
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Operates from An Input Battery Voltage Range of
+3V to +25V
±1.6% 0.75V Reference
- Over Line, Load Regulation, and Operating Temp.
High Efficiency all Over 90% at V
OUT
=1V, V
IN
=19V
Condition
Power-On-Reset Monitoring on PVCC and VCC Pins
Excellent Line and Load Transient Responses
Integrated 12mΩ @ VCC=5V N-Channel MOSFET
For High Side
Integrated 12mΩ @ VCC=5V N-Channel MOSFET
For Low Side
Programmable PWM Frequency from 100kHz to
500kHz
Built-in 1.2ms Digital Soft-Start & Soft-Stop
Built-in COT Mode Control for Fast Response and
MLCC Supports
Power Good Monitoring
70% Under-Voltage Protection
125% Over-Voltage Protection
Adjustable Current-Limit Protection
- Using Built-in Low-Side MOSFET’ R
DS(ON)
s
Over-Temperature Protection
TQFN5x6-28 (Power PAK) Package
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APW8802 is a 8A, synchronous, step-down converter
with integrated 12mΩ N-channel High-Side MOSFET and
12mΩ Low-Side MOSFET. The APW8802 steps down
high voltage to generate low-voltage chipset or RAM sup-
plies in notebook computers.
The APW8802 provides excellent transient response and
accurate DC voltage output in either PFM or PWM Mode.
In Pulse Frequency Mode (PFM), the APW8802 provides
very high efficiency over light to heavy loads with loading-
modulated switching frequencies. In PWM Mode, the con-
verter works nearly at constant frequency for low-noise
requirements.
The APW8802 is equipped with accurate current-limit,
output under-voltage, and output over-voltage protections,
perfect for NB applications. A Power-On-Reset function
monitors the voltage on V
PVCC
and V
CC
to prevent wrong
operation during power-on. The APW8802 has a 1.2ms
digital soft-start and built-in an integrated output discharge
device for soft-stop. An internal integrated soft-start ramps
up the output voltage with programmable slew rate to
reduce the start-up current. A soft-stop function actively
discharges the output capacitors.
The APW8802 is available in TQFN5x6-28 (Power PAK)
package.
Simplified Application Circuit
5V
V
IN
Applications
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•
Notebook
Table PC
Hand-Held Portable
AIO PC
EN
R
OCSET
PVCC
VCC
BOOT
L
OUT
LX
R
TON
TON
OCSET
FB
V
OUT
APW8802
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.3 - Jan., 2013
1
www.anpec.com.tw
APW8802
Ordering and Marking Information
APW8802
Assembly Material
Handling Code
Temperature Range
Package Code
APW8802 QB :
APW8802
XXXXX
Package Code
QB : TQFN5x6-28
Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
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
26 OCSET
27 PVCC
25 VOUT
28 VCC
24 TON
FB 1
POK 2
GND 3
PGND 4
PGND 5
NC 6
NC 7
LX 8
LX 10
LX 11
LX 12
LX 13
LX 14
LX
PGND
VIN
23 EN
22 PGND
21 BOOT
20 VIN
19 VIN
18 VIN
17 LX
16 LX
15 LX
LX 9
TQFN5x6-28
(Top View)
= Thermal Pad (connected to GND plane for better heat dissipation)
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jan., 2013
2
www.anpec.com.tw
APW8802
Absolute Maximum Ratings
(Note 1)
Symbol
V
CC
V
PVCC
V
BOOT-GND
V
BOOT
V
IN
Parameter
VCC Supply Voltage (VCC to GND)
PVCC Supply Voltage (PVCC to PGND)
BOOT Supply Voltage (BOOT to GND)
BOOT Supply Voltage (BOOT to LX)
Input Power Voltage (VIN to GND)
All Other Pins (VOUT, TON, EN, OCSET and FB to GND)
LX Voltage (LX to GND)
V
LX
V
POK
V
PGND
P
D
T
J
T
STG
T
SDR
POK Supply Voltage (POK to GND)
PGND to GND Voltage
Package Power Dissipation, T
A
=25
o
C
Maximum Junction Temperature
Storage Temperature
Maximum Lead Soldering Temperature, 10 Seconds
<400ns Pulse Width
>400ns Pulse Width
-5 ~ 35
-1 ~ 28
-0.3 ~ 7
-0.3 ~ 0.3
2.5
150
-65 ~ 150
260
V
V
V
W
o
o
Rating
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 35
-0.3 ~ 7
-0.3 ~ 25
-0.3 ~ V
CC
+0.3
Unit
V
V
V
V
V
V
C
C
C
o
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics
Symbol
θ
JA
Parameter
Thermal Resistance -Junction to Ambient
(Note 2)
TQFN5x6-28
Typical Value
40
Unit
°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
is soldered directly on the PCB.
Recommended Operating Conditions
(Note 3)
Symbol
V
IN
V
CC
, V
PVCC
V
OUT
I
OUT
T
A
T
J
Converter Input Voltage
VCC, PVCC Supply Voltage
Converter Output Voltage
Converter Output Current
Ambient Temperature
Junction Temperature
Parameter
Range
3 ~ 25
4.5 ~ 5.5
0.75 ~ 5.5
0~8
-40 ~ 85
-40 ~ 125
Unit
V
V
V
A
o
o
C
C
Note 3: Refer to the typical application circuit.
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jan., 2013
3
www.anpec.com.tw
APW8802
Electrical Characteristics
Refer to the typical application circuits. These specifications apply over V
CC
=5V, V
PVCC
=5V, and T
A
= -40 ~ 85 °C, unless
otherwise specified. Typical values are at T
A
=25°C.
Symbol
Parameter
Test Conditions
Min.
OUTPUT AND REFERENCE VOLTAGES
V
OUT
V
REF
Output Voltage
Reference Voltage
T
A
=25
o
C
Regulation Accuracy
T
A
=0 C~85 C
T
A
=-40 C~85 C
I
FB
R
DIS
FB Input Bias Current
VOUT Discharge Resistance
V
FB
=0.75V
V
EN
=0V, V
OUT
=0.5V
o
o
o
o
APW8802
Typ.
Max.
Unit
Adjustable output range
0.75
-
-0.9
-1.3
-1.6
-
-
-
0.75
-
-
-
0.02
20
5.5
-
+0.9
+1.3
+1.6
0.1
32
V
V
%
%
%
µA
Ω
SUPPLY CURRENT
VCC Plus PVCC Current, PWM,
EN is Floating, V
FB
=0.77V, V
LX
=-0.1V
VCC Plus PVCC Current, PFM, V
EN
=5V,
V
FB
=0.77V, V
LX
=0.5V
VCC Shutdown Current
PVCC Shutdown Current
EN=GND, V
CC
=5V
EN=GND, V
PVCC
=5V
-
-
-
-
400
250
0
4.5
750
470
1.0
7.5
µA
µA
µA
µA
I
VCC
VCC Input Bias Current
I
VCC_SHDN
I
PVCC_SHDN
ON-TIME TIMER AND INTERNAL SOFT-START
T
ONN
T
ONF
T
ONS
T
ON(MIN)
T
OFF(MIN)
T
SS
Nominal on Time
Fast on Time
Slow on Time
Minimum on Time
Minimum off Time
Internal Soft-Start Time
V
FB
=0.7V, V
LX
= -0.1V, OCSET is Open
EN High to V
OUT
Regulation
V
LX
=12V, V
OUT
=2.5V, R
TON
=250kΩ
V
LX
=12V, V
OUT
=2.5V, R
TON
=100kΩ
V
LX
=12V, V
OUT
=2.5V, R
TON
=400kΩ
-
280
-
80
350
0.9
749
330
1170
110
450
1.2
-
380
-
140
550
1.5
ns
ns
ns
ns
ns
ms
INTERNAL POWER MOSFETs
High Side Switch Resistance
Low Side Switch Resistance
VCC=5V, Guaranteed by design
VCC=5V, Guaranteed by design
-
-
12
12
15
15
mΩ
mΩ
PVCC AND VCC POWER-ON-RESET THRESHOLD
V
PVCC_THR
V
CC_THR
Rising PVCC POR Threshold Voltage
Rising VCC POR Threshold Voltage
VCC POR Hysteresis
CONTROL INPUTS
EN High Logic Level (Set in
Automatic PFM/PWM Mode)
Hysteresis
EN Floating Level (Set in
Forced-PWM Mode)
EN Low Logic Level (Set in
Shutdown)
Hysteresis
EN Leakage
V
EN
=0V
2.5
100
1.3
0.7
150
-
2.65
175
1.95
1.0
200
0.1
2.8
225
2.39
1.3
250
1.0
V
mV
V
V
mV
µA
4.25
4.25
-
4.35
4.35
100
4.45
4.45
-
V
V
mV
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jan., 2013
4
www.anpec.com.tw
APW8802
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over V
CC
=5V, V
PVCC
=5V, and T
A
= -40 ~ 85 °C, unless
otherwise specified. Typical values are at T
A
=25°C.
Symbol
POWER-OK INDICATOR
POK in from Lower
(POK Goes High)
V
POK
POK Threshold
POK Low Hysteresis
(POK Goes Low)
POK out from Normal
(POK Goes Low)
I
POK
POK Leakage Current
POK Sink Current
POK Enable Delay Time
CURRENT SENSE
I
OCSET
T
CIOCSET
V
ROCSET
I
OCSET
Sourcing Current
I
OCSET
Temperature Coefficient
Current-Limit Threshold
Setting Range
Over Current-Limit
Comparator Offset
Negative Over Current-Limit
Comparator Offset
Zero Crossing Comparator
Offset
PROTECTIONS
V
UV
Under-Voltage Protection
Threshold
Under-Voltage Protection
Hysteresis
Under-Voltage Debounce
Interval
Under-Voltage Protection
Enable Delay
V
OVR
Over-Voltage Protection Rising
Threshold
Over-Voltage Protection
Propagation Delay
T
OTR
Over-Temperature Protection
Rising Threshold
(Note 4)
Over-Temperature Protection
Hysteresis
(Note 4)
Note 4: Guaranteed by design.
Parameter
Test Conditions
Min.
APW8802
Typ.
Max.
Unit
87
-
120
-
2.5
1.4
90
3
125
0.1
7.5
2.0
93
-
130
1.0
-
2.6
%
%
%
µA
mA
ms
µA
ppm/
o
C
mV
mV
mV
mV
V
POK
=5V
V
POK
=0.5V
EN high to POK high
9
On The Basis of 25°C
V
OCSET-GND
Voltage, Over All
Temperature
(V
OCSET-GND
-V
PGND-LX
) Voltage,
V
OCSET-GND
=60mV
(V
OCSET-GND
-V
PGND- LX
) Voltage,
V
OCSET-GND
=60mV, EN is Floating
V
PGND- LX
Voltage, V
EN
=3.3V
-
30
-10
-9.5
-9.5
10
4500
-
0
0.5
0.5
11
-
200
10
10.5
10.5
V
FB
Falling
60
-
-
70
3
16
2
125
1.5
160
25
80
-
-
2.6
130
-
-
-
%
%
µs
ms
%
µs
o
EN High to UVP Workable
1.4
120
V
FB
Rising, DV=10mV
-
-
-
C
C
o
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jan., 2013
5
www.anpec.com.tw
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