W83321G [WINBOND]
N-Channel FET Synchronous Buck Regulator Controller; N沟道FET同步降压稳压器控制器
| 型号： | W83321G |
| 厂家： | 
WINBOND |
| 描述： | N-Channel FET Synchronous Buck Regulator Controller |
| 文件： | 总18页 (文件大小：768K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
W83321S/W83321G
Winbond
N-Channel FET Synchronous Buck
Regulator Controller
W83321S
W83321G
Publication Release Date: January, 2006
- 1 -
Revision 0.51
W83321S/W83321G
W83321S
Data Sheet Revision History
VERSION
PAGES
DATES
VERSION
MAIN CONTENTS
ON WEB
2004/3/19
0.5
N.A
All versions before 0.5 are for internal use only.
1. Add Pb-free part no:W83321G
1
2
5
2005/1/21
0.51
N.A
2. Add separate VCC12 rail for VBOOT
application circuit.
Please note that all data and specifications are subject to change without notice. All the trademarks of
products and companies mentioned in this datasheet belong to their respective owners.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where
malfunction of these products can reasonably be expected to result in personal injury. Winbond
customers using or selling these products for use in such applications do so at their own risk and
agree to fully indemnify Winbond for any damages resulting from such improper use or sales.
- 2 -
W83321S/W83321G
Table of Content-
1.
GENERAL DESCRIPTION ......................................................................................................... 4
FEATURES................................................................................................................................. 4
APPLICATIONS.......................................................................................................................... 5
PIN-OUT ..................................................................................................................................... 5
PIN DESCRIPTION..................................................................................................................... 6
INTERNAL BLOCK DIAGRAM ................................................................................................... 7
APPLICATION CIRCUIT............................................................................................................. 8
LAYOUT PLACEMENT............................................................................................................... 9
ELECTRICAL CHARACTERISTICS......................................................................................... 10
TYPICAL OPERATING WAVEFORMS .................................................................................... 11
PACKAGE DIMENSION OUTLINE........................................................................................... 16
ORDERING INSTRUCTION..................................................................................................... 17
HOW TO READ THE TOP MARKING...................................................................................... 17
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Publication Release Date: January, 2006
- 3 -
Revision 0.51
W83321S/W83321G
1. GENERAL DESCRIPTION
The W83321S is a high-speed, N-Channel synchronous buck regulator controller. The W83321S
employs fixed-frequency voltage-mode PWM control architecture. Both high-side and low-side
MOSFETs are lower cost N-Channel type. The regulator is biased from a 5V rail and the power for the
high-side MOSFET can be supplied by a separate 12V rail or supplied from a local charge pump.
Current limit is achieved by monitoring the voltage drop across the on resistance of the low-side
MOSFET. This method eliminates the requirement of extra current sensing resistor and avoids false
trigger of OC protection when VIN varies. The adaptive non-overlapping MOSFET gate drivers help
avoid potential shoot-through problems while maintaining high efficiency.
2. FEATURES
y
y
Operates from +5V Input
0.8V to VIN Output Range
- 0.8V Internal Reference
- ±1.5% Over Line Voltage and Temperature
Drives N-Channel MOSFETs
Simple Single-Loop Control Design
- Voltage-Mode PWM Control
Fast Transient Response
y
y
y
y
Lossless, Programmable Overcurrent Protection
- Uses Lower MOSFET’s Rds (on)
- Current limit without sense resistor
Small Converter Size
y
- 250 kHz Fixed Frequency Oscillator
- Internal Soft Start
- Tiny plastic SOP-8 package
- 4 -
W83321S/W83321G
3. APPLICATIONS
y
y
Motherboard Power Supplies Regulation
Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
- SSTL-2 and DDR SDRAM Bus Termination Supply
Cable Modems, Set Top Boxes, and DSL Modems
DSP and Core Communications Processor Supplies
Memory Power Supplies
y
y
y
y
y
y
y
Personal Computer Peripherals
Industrial Power Supplies
5V-Input DC-DC Regulators
Low-Voltage Distributed Power Supplies
4. PIN-OUT
1
2
3
4
8
7
6
5
ISEN
COMP
FB
BOOT
UGATE
GND
W83321
VCC
LGATE
Publication Release Date: January, 2006
Revision 0.51
- 5 -
W83321S/W83321G
5. PIN DESCRIPTION
PIN
NAME
FUNCTION
Supply rail for the high-side MOSFET driver. A bootstrap circuit may be used to
create a BOOT voltage or a separate 12V supply can be used.
1
BOOT
Gate drive for the high-side N-channel MOSFET. This pin is also monitored by
the adaptive shoot through protection circuitry to determine when the high-side
MOSFET has turned off.
2
3
4
UGATE
GND
Ground for analog circuit. Connect it to system ground.
Gate drive for the low-side N-channel MOSFET. This pin is also monitored by
the adaptive shoot through protection circuitry to determine when the low-side
MOSFET has turned off.
LGATE
5
6
VCC
FB
+5V supply rail for the lower gate driver and control logic circuit.
Inverting Input of the Error Amplifier. This pin is available for compensation of
the control loop.
Internal Error Amplifier Output Pin. This pin is available for compensation of the
7
8
COMP
ISEN
control loop and pulling this pin low with an open drain device will shutdown the
IC.
Current limit threshold setting. Connect a resistor (ROCSET) between this pin and
the drain of the low-side MOSFET.
- 6 -
W83321S/W83321G
6. INTERNAL BLOCK DIAGRAM
VDD
POR
90µA
ISEN
Soft Start
VREF
0.8V
Ramp
Control
Logic
BOOT
+
Output
Clamp
UGATE
EA
-
Gate
Control
Logic
FB
+
-
COMP
VDD
Oscillator
250KHz
Ramp
Generator
LGATE
1.5Vp-p
GND
MOSFET Gate Drivers
Power for the high-side driver is through the BOOT pin. This voltage can be supplied by a separate,
higher voltage source, or supplied from a local charge pump structure or even the combination of the
two.
Since the voltage of the low-side MOSFET gate and the high-side MOSFET gate are being monitored
to determine the state of the MOSFET, it should be considered carefully to add external components
between the gate drivers and their respective MOSFET gates. Doing so may interfere with the shoot-
through protection.
Current Limit (Over current protection)
Current limit is realized by sensing the voltage across the low-side MOSFET while it is on. This
method enhances the converter's effeciency and reduces cost by eliminating a current sensing
resistor.
While low-side MOSFET is turned on, a constant current of 90uA is forced through ROCSET which is an
external resistor connected between phase and ISEN, causing a fixed voltage drop. This fixed voltage
is compared against VDS and if the latter is higher, the chip enters current limit mode. In the current
limit mode both the high-side and low-side MOSFETS are turned off. After a 25ms delay, a soft-start
Publication Release Date: January, 2006
- 7 -
Revision 0.51
W83321S/W83321G
cycle is initiated. If the cause of the overcurrent is still present after the delay interval, the current limit
would be triggered again. The shut dowm - delay - soft start cycle will be repeated indefinitely untill the
overcurrent event has cleared.
IPEAK = (IOCSET x ROCSET) / RDS(ON) RDS(ON):Low Side MOSFET Resistance
7. APPLICATION CIRCUIT
Local charge pump for VBOOT application:
R1 3.7K
C1 0.1uF
VCC5
U1
D1
1
2
3
4
8
7
6
5
BOOT
UGATE
GND
ISEN
COMP
FB
C4 (OPT)
C2
2000uF 1uF
N DSG
C3 Q1
1N4148/Shuttky
3
3
VOUT=0.8X(R5+R6)/R6
L1 3.3uH
C5 2.2nF
R2 100K
VCC5
C6
2000uF
C7
2000uF
C8
0.1uF
R3
2.2
Q2
R4 10
LGATE
VCC
N DSG
W83321S
C9
1uF
C10
6.8nF
R5 16K(1%)
R6
7.5K(1%)
Separate VCC12 rail for VBOOT application:
R1 3.7K
R7 10
VCC12
VCC5
C1
1000uF
C11
1uF
U1
1
2
3
4
8
BOOT
ISEN
C4 (OPT)
C2
C3 Q1
2000uF 1uF
N DSG
3
7
UGATE
GND
COMP
VOUT=0.8X(R5+R6)/R6
L1 3.3uH
6
C5 2.2nF
R4 10
R2 100K
VCC5
FB
C6
2000uF
C7
2000uF
C8
0.1uF
R3
2.2
Q2
N DSG
3
5
LGATE
VCC
W83321S
C9
1uF
C10
6.8nF
R5 16K(1%)
R6
7.5K(1%)
- 8 -
W83321S/W83321G
8. LAYOUT PLACEMENT
G
S
D
C3
1uF
C2
2000uF
Q1
G
S
L1
VCC
D
C9
1uF
Q2
W83321S
C6
2000uF
C7
2000uF
BOOT
PIN1
C1 0.1uF
Layout Notes:
1.Put Q1 and Q2 as close as possible and using wide,short
printed circuit traces between Q1 source and Q2 drain.
2.Put C2 and C3 to be near the Q1 drain and Q2 source nodes.
3.Put C1 as close as to BOOT pin.
4.Put C9 as close as to VCC pin.
Publication Release Date: January, 2006
- 9 -
Revision 0.51
W83321S/W83321G
9. ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNITS
VCC SUPPLY CURRENT
Nominal Supply
EN=VCC; UGATE and LGATE
Open
ICC
-
3
-
mA
POWER-ON RESET
Rising VDD
Threshold
-
-
4.3
3.7
4.5
-
V
V
Falling VDD
Threshold
OSCILLATOR
Free Running
Frequency
200
-
250
1.5
300
-
kHz
VP-P
Ramp Amplitude
ΔVOSC
REFERENCE
Reference Voltage
Tolerance
VREF
-1.5
-
-
1.5
-
%
V
Reference Voltage
ERROR AMPLIFIER
DC Gain
0.8
-
-
-
85
5.5
4.1
-
-
-
dB
Gain-Bandwidth
Slew Rate
MHz
V/µS
GATE DRIVERS
High-side Gate
Source
IHGATE-SRC
IHGATE-SNK
ILGATE-SRC
ILGATE-SNK
VBOOT=12V,VUGATE=6V
VBOOT=12V,VUGATE=6V
VCC=5V, VLGATE=2.5V
VCC=5V, VLGATE=2.5V
250
600
250
300
-
-
-
-
-
-
-
-
mA
mA
mA
mA
High-side Gate Sink
Low-side Gate
Source
Low-side Gate Sink
PROTECTION/DISABLE
ISEN Current
Source
ISEN
72
-
90
108
-
µA
V
Disable Threshold
VCOMP
0.4
- 10 -
W83321S/W83321G
10. TYPICAL OPERATING WAVEFORMS
Dead Time: VCC=5V; VOUT=2.5V
Channel 1: UGATE Channel 2: LGATE
Dead Time: VCC=5V; VOUT=2.5V
Channel 1: UGATE Channel 2: LGATE
Publication Release Date: January, 2006
Revision 0.51
- 11 -
W83321S/W83321G
Power On: VCC=5V; VOUT=2.5V
Channel 1: VCC Channel 2: VOUT
Power Off: VCC=5V; VOUT=2.5V
Channel 1: VCC Channel 2: VOUT
- 12 -
W83321S/W83321G
Bootstrap: VCC=5V; VOUT=2.5V
Channel 1: UGATE Channel 2: LGATE Channel 3: BOOT
Soft Start: VCC=5V; VOUT=2.5V
Channel 1: UGATE Channel 2: VOUT
Publication Release Date: January, 2006
Revision 0.51
- 13 -
W83321S/W83321G
Load Transient: VCC=5V; VOUT=2.5V; Cout=2200uF
Channel 3: VOUT Channel 4: Iout (Loading=0Æ5A)
Load Transient: VCC=5V; VOUT=2.5V; Cout=2200uF
Channel 3: VOUT Channel 4: Iout (Loading=5Æ0A)
- 14 -
W83321S/W83321G
Short Hiccup: VCC=5V; VOUT=2.5V; Cout=2200uF with R=0.1(ohm) load.
Channel 1: UGATE Channel 2: VOUT Channel4: Iout
Publication Release Date: January, 2006
Revision 0.51
- 15 -
W83321S/W83321G
11. PACKAGE DIMENSION OUTLINE
8L SOP (150mil)
- 16 -
W83321S/W83321G
12. ORDERING INSTRUCTION
PART NO.
PACKAGE
REMARKS
W83321S
8-pin SOP
Operation - Commercial 0~70℃
Operation - Commercial 0~70℃
W83321G
8-pin SOP
Pb-free package
13. HOW TO READ THE TOP MARKING
W83
321S
323GA
W83
321G
323GA
Left Line: Winbond Logo
1st and 2nd Line: the part number,321G is for Pb-free package
3rd Line: Tracking Code
323: packages assembled in Year 03’, week 23
G: assembly house ID; G means GR, O means OSE, etc.
A: the IC version
Publication Release Date: January, 2006
Revision 0.51
- 17 -
W83321S/W83321G
Please note that all data and specifications are subject to change without notice. All the trade
marks of products and companies mentioned in this data sheet belong to their respective
owners.
Important Notice
Winbond products are not designed, intended, authorized or warranted for use as components
in systems or equipment intended for surgical implantation, atomic energy control
instruments, airplane or spaceship instruments, transportation instruments, traffic signal
instruments, combustion control instruments, or for other applications intended to support or
sustain life. Further more, Winbond products are not intended for applications wherein failure
of Winbond products could result or lead to a situation wherein personal injury, death or
severe property or environmental damage could occur.
Winbond customers using or selling these products for use in such applications do so at their
own risk and agree to fully indemnify Winbond for any damages resulting from such improper
use or sales.
- 18 -
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