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PDF APW8821 Data sheet ( Hoja de datos )
| Número de pieza | APW8821 | |
| Descripción | Notebook PWM Controller | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW8821
Notebook PWM Controller with Differential Voltage Feedback
Features
General Description
• Adjustable Output Voltage from +0.5V to +3.3V
The APW8821 is a single-phase, constant on-time, syn-
- 0.5V Reference Voltage
chronous PWM controller, which drives N-channel
- +0.6% Accuracy
MOSFETs. The APW8821 steps down high voltage to
generate low-voltage chipset or RAM supplies in note-
• Operates from An Input Battery Voltage Range of book computers.
+1.8V to +28V
The APW8821 provides excellent transient response and
• Remote Feedback Sense for Excellent Output
Voltage
accurate DC voltage output in either PFM or PWM Mode.
In Pulse Frequency Mode (PFM), the APW8821 provides
very high efficiency over light to heavy loads with loading-
• REFIN Function for Over-clocking Purpose from
0.5V~2.5V range
• Power-On-Reset Monitoring on VCC Pin
modulated switching frequencies. In PWM Mode, the con-
verter works nearly at constant frequency for low-noise
requirements. APW8821 is built in remote sense func-
tion for applications that require remote sense.
• Excellent line and load transient responses
The APW8821 is equipped with accurate positive cur-
• PFM mode for increased light load efficiency
• 350kHz Constant PWM Switching Frequency
• Integrated MOSFET Drivers
• Integrated Bootstrap Forward P-CH MOSFET
rent limit, output under-voltage, and output over-volt-
age protections, perfect for NB applications. The Power-
On-Reset function monitors the voltage on VCC to
prevent wrong operation during power-on. The
APW8821 has a 1ms digital soft start and built-in an
• Adjustable Integrated Soft-Start and Soft-Stop
integrated output discharge device for soft stop. An
• Power Good Monitoring
• 70% Under-Voltage Protection
• 125% Over-Voltage Protection
• Adjustable Current-limit protection
internal integrated soft-start ramps up the output volt-
age with programmable slew rate to reduce the start-
up current. A soft-stop function actively discharges the
output capacitors.
The APW8821 is available in 10pin TDFN 3x3 package
-Using Sense Low-Side MOSFET?¦s RDS(ON)
respectively.
• Over-Temperature Protection
• TDFN-10 3x3 package
• Lead Free and Green Device Available
(RoHS Compliant)
Applications
• Notebook
• Table PC
• Hand-Held Portable
• AIO PC
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.1 - Feb., 2012
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APW8821
Electrical Characteristics (Cont.)
These specifications apply over TA = -40 ~ 85°C, unless otherwise specified. Typical values are at TA = 25°C, VCC=5V
Symbol
Parameter
Test Conditions
CONTROL INPUTS
Shutdown
REFIN Voltage Threshold
External Reference, VOUT=VREFIN
Internal Reference, VOUT=FB setting
REFIN Leakage
REFIN=0V
REFIN slew rate
Internal slew rate
POWER-OK INDICATOR
VPOK
POK Threshold
POK in from Lower (POK Goes
High)
POK out from normal POK out
from normal with 30us noise filter
(POK Goes Low)
IPOK POK Leakage Current
VPOK = 5V
POK Sink Current
VPOK = 0.5V
POK Enable Delay Time
VOUTfrom low to POK High
VCC POWER-ON-RESET (POR) THRESHOLD
IOCSET
IOCSET OCP Threshold
IOCSET Sourcing
TCIOCSET
IOCSET Temperature
Coefficient
On The Basis of 25°C
VROCSET
Maximum Current Limit
Threshold
ROCSET open
Zero Crossing Comparator
Offset
VGND-PHASE Voltage
PROTECTIONS
VUV UVP Threshold
UVP Debounce Interval
UVP Enable Delay
VOUT from low to POK High
VOVR
OVP Rising Threshold
OVP Hysteresis
TOTR
OVP Propagation Delay
OTP Rising Threshold (Note 4)
OTP Hysteresis (Note 4)
VFB Rising, DV=10mV
Note 4 : Guaranteed by design, not production tested.
Min.
APW8821
Typ.
Max.
Unit
- - 0.4
0.5 - 2.5 V
-3-
- 0.1 1.0 µA
- 8 - mV/us
87 90 93 %
120 125 130
%
- 0.1 1.0 µA
2.5 7.5
- mA
- 1.6 - ms
9 10 11 µA
-
4500
-
ppm/
oC
- 0.6 - V
-3 0
3 mV
60 70 80 %
- 16 - µs
- 1.6 - ms
120 125 130
%
- 5 -%
- 2 - µs
- 140 - oC
- 25 - oC
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Feb., 2011
5
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APW8821
Block Diagram
POK VOUT RTN
VREF x 125%
VREF x 90%
125% VREF
OV
Debounce
Time
VOUT
DIFFOUT
70% VREF
FB
Fault
Latch
UV Logic
Thermal
Shutdown
Error
Comparator
On-Time
Generator
VCC
DIFFOUT
VCC
VREF
Digital
Soft Start/Soft Sop
VOUT
POR
Sample
and Hold
PHASE
10µA
REFIN
VROCSET
To LGATE
Sense Low-
Side
VROCSE
OCP
T
VCC
GND
BOOT
UGATE
PHASE
LGATE
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Feb., 2011
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet APW8821.PDF ] | |
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