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PDF APW8700 Data sheet ( Hoja de datos )
| Número de pieza | APW8700 | |
| Descripción | Dual-Phase Synchronous-Rectifier Buck Controller | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW8700
Dual-Phase Synchronous-Rectifier Buck Controller
Features
General Description
• Voltage-Mode Operation with Current Sharing
• Operate with 4.5V~13.2V Supply Voltage
• Support Single and Two-Phase Operations
• +2% Reference Voltage Accuracy Over
Temperature
• Loss-Less Inductor DCR Current Sensing
• Adjustable Over Current Protection use DCR
Current Sensing
• Programmable PWM Switching Frequency from
100kHz to 800kHz
• Dynamic Output Voltage Adjustment
• Adjustable Soft-start
• QFN4x4-24 Package
• Halogen and Lead Free Available (RoHS Compliant)
Simplified Application Circuit
The APW8700, two-phase PWM control IC, provides a
precision voltage regulation system for advanced graphic
card and motherboard applications. The integration of
power MOSFET drivers into the controller IC and reduces
the number of external parts for a cost and space saving
power management solution.
The APW8700 uses a voltage-mode PWM architecture,
operating with adjust frequency from 100kHz to 800kHz.
The device uses the voltage across the DCRs of the in-
ductors for current sensing achieves high efficiency. The
device integrates adjustable load line voltage position-
ing (droop) and adopts low side RDS_ON for channel-cur-
rent balance.
The automatic phase reduction and over-current protec-
tion are accomplished through continuous inductor DCRs
current sensing.
The APW8700 also implement a one-bit VID control op-
eration in which the feedback voltage is regulated and
tracks external input reference voltage.
This controller protection features include over-
temperature(OTP), over-voltage(OVP), under-voltage
(UVP) and over-current protections (OCP).
The device also provides a power-on-reset function and
a programmable soft-start to prevent wrong operation and
limit the input surge current during power-on or start-up.
The APW8700 is available in QFN4x4-24 packages.
Applications
• VGA
• Mother Board
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 - Jun., 2011
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APW8700
Electrical Characteristics (Cont.)
Refer to figure 1 in the “Typical Application Circuits”. These specifications apply over VVCC = 12V, TA= 25oC, unless otherwise noted.
Symbol
Parameter
TOTAL CURRENT SENSE
ICSN_MAX Maximum Sourcing Current
GM Amplifier Offset
ICSN_OCP
Over-Current Protection Threshold
Level
Droop Accuracy
PSI Accuracy
PHASE CURRENT SENSE
gm Trans-conductance
VIOFS
IOFS Voltage
VID CONTROL INPUT
VIH Logic High Threshold Level
VIL Logic Low Threshold Level
RRSET On Resistance of RSET MOSFET
IRSET
Leakage Current of RSET Pin
Gate Driver
RUG_SRC Upper Side Gate Sourcing
RUG_SNK
RLG_SRC
Upper Side Gate Sinking
Low Side Gate Sourcing
RLG_SNK Low Side Gate Sinking
TDT Dead-time
PROTECTION
Over Voltage Protection (OVP)
Over Voltage Hysteresis
Under Voltage Protection (UVP)
Over Current Protection (OCP)
Over Temperature Protection (OTP)
Over Temperature Hysteresis
Note 4: Guarantee by design, not production test
Test Conditions
IDRP/ICSN
IPSI/ICSN
100kΩ from IOFS to VREF
100kΩ from IOFS to GND
VID=High
VRSET=2V, VID=GND
IUGATE=100mA Sourcing
IUGATE=100mA Sinking
ILGATE=100mA Sourcing
ILGATE=100mA Sinking
VFB/VEAP
VFB/VEAP
ICSN
APW8700
Min. Typ. Max.
Unit
100 -
-5 -
- µA
5 mV
55 60 65 µA
90 100 110
90 100 110
%
%
- 1.0 - mA/V
1.425 1.5 1.575
V
0.475 0.5 0.525
V
1.2 - - V
- - 0.4 V
- 20 -
Ω
- - 0.1 µA
- 24Ω
- 1.5 3
Ω
- 24Ω
- 12Ω
- 30 - ns
125 130 135
- 20 -
45 50 55
55 60 65
- 150 -
- 20 -
%
%
%
µA
οC
οC
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011
5
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APW8700
Block Diagram
VCC
VREF
RSET
VID
AGND
REFIN
SS
EAP
FB
COMP
BOOT1
UGATE1
PHASE1
LGATE1
Internal
Regulator
1
Current
Limit
Buffer
Error
Amplifier
IDRP
PVCC
VCC
Logic
Control
VOSC1
1V
Power
On
Reset
Current
Balance
Over
Current
Protection
Internal
Regulator
2
PVCC
IOFS
Gm
Amplifier
CSP
CSN
Power
Saving
Setting
PVCC
GND
PSI
Oscillator
Logic
Control
VOSC2
Enable
VCC
BOOT2
UGATE2
PHASE2
LGATE2
0.5V
RT/EN
Copyright © ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet APW8700.PDF ] | |
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