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PDF APW8802 Data sheet ( Hoja de datos )
| Número de pieza | APW8802 | |
| Descripción | High Input Voltage 8A PWM DC/DC Converter | |
| Fabricantes | ANPEC | |
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APW8802
High Input Voltage 8A PWM DC/DC Converter
Features
General Description
• 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 VOUT=1V, VIN=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’s R
DS(ON)
• Over-Temperature Protection
• TQFN5x6-28 (Power PAK) Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Notebook
• Table PC
• Hand-Held Portable
• AIO PC
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 VPVCC and VCC 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
PVCC
VCC BOOT
LX
EN
ROCSET
TON
OCSET FB
APW8802
VIN
LOUT
RTON
VOUT
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
Free Datasheet http://www.datasheet4u.com/
1 page  
APW8802
Electrical Characteristics (Cont.)
Refer to the typical application circuits. These specifications apply over V =5V, V =5V, and T = -40 ~ 85 °C, unless
CC PVCC
A
otherwise specified. Typical values are at TA=25°C.
Symbol
Parameter
Test Conditions
APW8802
Min. Typ. Max.
Unit
POWER-OK INDICATOR
VPOK
POK Threshold
IPOK POK Leakage Current
POK Sink Current
POK Enable Delay Time
POK in from Lower
(POK Goes High)
POK Low Hysteresis
(POK Goes Low)
POK out from Normal
(POK Goes Low)
VPOK=5V
VPOK=0.5V
EN high to POK high
87 90 93
-3-
120 125 130
- 0.1 1.0
2.5 7.5
-
1.4 2.0 2.6
%
%
%
µA
mA
ms
CURRENT SENSE
IOCSET
TCIOCSET
VROCSET
IOCSET Sourcing Current
IOCSET Temperature Coefficient
Current-Limit Threshold
Setting Range
Over Current-Limit
Comparator Offset
Negative Over Current-Limit
Comparator Offset
On The Basis of 25°C
VOCSET-GND Voltage, Over All
Temperature
(VOCSET-GND-VPGND-LX) Voltage,
VOCSET-GND=60mV
(VOCSET-GND-VPGND- LX) Voltage,
VOCSET-GND=60mV, EN is Floating
9 10 11 µA
- 4500 - ppm/oC
30 - 200 mV
-10 0 10 mV
-9.5 0.5 10.5 mV
Zero Crossing Comparator
Offset
VPGND- LX Voltage, VEN=3.3V
-9.5 0.5 10.5 mV
PROTECTIONS
VUV
VOVR
TOTR
Under-Voltage Protection
Threshold
Under-Voltage Protection
Hysteresis
Under-Voltage Debounce
Interval
Under-Voltage Protection
Enable Delay
Over-Voltage Protection Rising
Threshold
Over-Voltage Protection
Propagation Delay
Over-Temperature Protection
Rising Threshold (Note 4)
Over-Temperature Protection
Hysteresis (Note 4)
VFB Falling
EN High to UVP Workable
VFB Rising, DV=10mV
60 70 80
-3-
- 16 -
1.4 2 2.6
120 125 130
- 1.5 -
- 160 -
- 25 -
%
%
µs
ms
%
µs
oC
oC
Note 4: Guaranteed by design.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Jan., 2013
5
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APW8802
Pin Description
PIN
NO. NAME
1 FB
2
3
4, 5, 22
6, 7
POK
GND
PGND
NC
FUNCTION
Output Voltage Feedback Pin. This pin is connected to the resistive divider that set the desired output
voltage. The POK, UVP, and OVP circuits detect this signal to report output voltage status.
Power Good Output. POK is an open drain output used to indicate the status of the output voltage. Connect
the POK in to +5V through a pull-high resistor.
Signal Ground for The IC.
Power Ground of The Low-side MOSFET Driver and the Source of Internal Low-side MOSFET.
No Connection.
8 ~ 17
LX
Junction Point of The High-side MOSFET Source, Output Filter Inductor And The Low-side MOSFET Drain.
Connect this pin to the output inductor. LX serves as the lower supply rail for the high-side gate driver.
18, 19, 20
21
23
24
25
26
27
28
VIN
BOOT
EN
TON
VOUT
OCSET
PVCC
VCC
Battery voltage input pin.
Supply Input for The High-side MOSFET Gate Driver And An Internal Level-shift Circuit. Connect to an
external capacitor to create a boosted voltage suitable to drive a logic-level N-channel MOSFET.
Enable Pin of The PWM Controller. When the EN is above high logic level, the device is in automatic
PFM/PWM Mode. When the EN is floating, the device is in Forced-PWM Mode. When the EN is below low
logic level, the device is in shutdown and only low leakage current is taken from VCC and VIN.
This pin is allowed to adjust the switching frequency. Connect a resistor RTON = 100kΩ ~ 600kΩ from TON
to LX.
The VOUT Pin Makes A Direct Measurement for On-Time Generator. The VOUT should be connected to the
top feedback resistor at the converter output.
Current-Limit Threshold Setting Pin. There is an internal source current 10µA through a resistor from
OCSET to GND. This pin is used to monitor the voltage drop across the Drain and Source of the low-side
MOSFET for current-limit.
Supply Voltage Input Pin for The Low-side MOSFET Gate Driver. Connect +5V from the PVCC to the
PGND. Decoupling at least 1µF of a MLCC capacitor from the PVCC to the PGND.
Supply Voltage Input Pin for Control Circuitry. Connect +5V from the VCC to the GND. Decoupling at least
1µF of a MLCC capacitor from the VCC to the GND.
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Jan., 2013
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet APW8802.PDF ] | |
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