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6227CAZ 데이터시트 PDF




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기능 ISL6227CAZ
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6227CAZ 데이터시트, 핀배열, 회로
®
Data Sheet
Dual Mobile-Friendly PWM Controller with
DDR Option
The ISL6227 dual PWM controller delivers high efficiency
precision voltage regulation from two synchronous buck DC/DC
converters. It was designed especially to provide power
regulation for DDR memory, chipsets, graphics and other
system electronics in Notebook PCs. The ISL6227’s wide
input voltage range capability allows for voltage conversion
directly from ac/dc adaptor or Li-Ion battery pack.
www.DataSheAreeuct4ttoiUfmic.caaottmiiocnmaotdheeatrvaynsloitaiodn,
of constant-frequency synchronous
and hysteretic (HYS) diode-
emulation at light load, assure high efficiency over a wide range
of conditions. The HYS mode of operation can be disabled
separately on each PWM converter if constant-frequency
continuous-conduction operation is desired for all load levels.
Efficiency is further enhanced by using the lower MOSFET
rDS(ON) as the current sense element.
Voltage-feed-forward ramp modulation, current mode control,
and internal feedback compensation provide fast response to
input voltage and load transients. Input current ripple is
minimized by channel-to-channel PWM phase shift of 0°, 90°, or
180° (determined by input voltage and status of the DDR pin).
The ISL6227 can control two independent output voltages
adjustable from 0.9V to 5.5V, or by activating the DDR pin,
transform into a complete DDR memory power supply solution.
In DDR mode, CH2 output voltage VTT tracks CH1 output
voltage VDDQ. CH2 output can both source and sink current, an
essential power supply feature for DDR memory. The reference
voltage VREF required by DDR memory is generated as well.
In dual power supply applications the ISL6227 monitors the
output voltage of both CH1 and CH2. An independent PGOOD
(power good) signal is asserted for each channel after the soft-
start sequence has completed, and the output voltage is within
PGOOD window. In DDR mode CH1 generates the only
PGOOD signal.
Built-in overvoltage protection prevents the output from going
above 115% of the set point by holding the lower MOSFET on
and the upper MOSFET off. When the output voltage re-enters
regulation, PGOOD will go HIGH and normal operation
automatically resumes. Once the soft-start sequence has
completed, undervoltage protection latches the offending
channel off if the output drops below 75% of its set point value.
Adjustable overcurrent protection (OCP) monitors the voltage
drop across the rDS(ON) of the lower MOSFET. If more precise
current-sensing is required, an external current sense resistor
may be used.
Applications
• Notebook PCs and Desknotes
• Hand-held portable instruments
• Tablet PCs/Slates
1
ISL6227
March 2004
FN9094.1
Features
• Provides regulated output voltage in the range 0.9V–5.5V
• Operates from an input battery voltage range of 5V to 24V
or from 3.3V/5V system rail
• Complete DDR1 and DDR2 memory power solution with
VTT tracking VDDQ/2 and a VDDQ/2 buffered reference
output
• Flexible PWM or HYS plus PWM mode selection with HYS
diode emulation at light loads for higher system efficiency
• rDS(ON) current sensing
• Excellent dynamic response with voltage feed-forward and
current mode control accommodating wide range LC filter
selections
• Undervoltage lock-out on VCC pin
• Power-good, overcurrent, overvoltage, undervoltage
protection for both channels
• Synchronized 300kHz PWM operation in PWM mode
• Pb-Free Available as an Option
Ordering Information
PART # TEMP. (°C)
PACKAGE
PKG.
DWG. #
ISL6227CA
-10 to 100 28 Ld SSOP
M28.15
ISL6227CAZ
(Note)
-10 to 100 28 Ld SSOP (Pb-Free)
M28.15
ISL6227CA-T -10 to 100 28 Ld SSOP Tape and Reel M28.15
ISL6227CAZ-T -10 to 100 28 Ld SSOP Tape and Reel M28.15
(Note)
(Pb-Free)
NOTE: Intersil Pb-Free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-Free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
Pinout
ISL6227 (28 LD SSOP) TOP VIEW
GND 1
LGATE1 2
PGND1 3
PHASE1 4
UGATE1 5
BOOT1 6
ISEN1 7
EN1 8
VOUT1 9
VSEN1 10
OCSET1 11
SOFT1 12
DDR 13
VIN 14
28 VCC
27 LGATE2
26 PGND2
25 PHASE2
24 UGATE2
23 BOOT2
22 ISEN2
21 EN2
20 VOUT2
19 VSEN2
18 OCSET2
17 SOFT2
16 PG2/REF
15 PG1




6227CAZ pdf, 반도체, 판매, 대치품
ISL6227
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. (Continued)
PARAMETER
PWM CONVERTERS
Load Regulation
SYMBOL
TEST CONDITIONS
MIN
0.0mA < IVOUT1 < 5.0A; 5.0V < VBATT < 24.0V
-2.0
VSEN pin bias current
Minimum Duty Cycle
Maximum Duty Cycle
VOUT pin input impedance
Undervoltage Shut-Down Level
Overvoltage Protection
www.DataSheGetA4TUE.coDmRIVERS
IVSEN
Dmin
Dmax
IVOUT
VUVL
VOVP1
By design
VOUT = 5V
Fraction of the set point; ~2µs noise filter
Fraction of the set point; ~2µs noise filter
Upper Drive Pull-Up Resistance
R2UGPUP
Upper Drive Pull-Down Resistance
R2UGPDN
Lower Drive Pull-Up Resistance
R2LGPUP
Lower Drive Pull-Down Resistance
R2LGPDN
POWER GOOD AND CONTROL FUNCTIONS
VCC = 5V
VCC = 5V
VCC = 5V
VCC = 5V
Power Good Lower Threshold
Power Good Higher Threshold
PGOODx Leakage Current
PGOODx Voltage Low
ISEN sourcing current
VPG-
VPG+
IPGLKG
VPGOOD
Fraction of the set point; ~3µs noise filter
Fraction of the set point; ~3µs noise filter.
VPULLUP = 5.5V
IPGOOD = -4mA
By design
OCSET sourcing current range
EN - Low (Off)
EN - High (On)
Continuous-Conduction-Mode(CCM)
Enforced (HYS Operation Inhibited)
VOUTX pulled low
Automatic CCM/HYS Operation
Enabled
VOUTX connected to the output
DDR - Low (Off)
DDR - High (On)
DDR REF Output Voltage
VDDREF DDR = 1, IREF = 0...10mA
DDR REF Output Current
IDDREF DDR = 1. Guaranteed by design.
-
-
-
-
70
110
-
-
-
-
84
110
-
-
-
2
-
2.0
-
0.9
-
3
0.99*
VOC2
-
TYP
-
80
4
87
134
75
115
4
2.3
4
1.1
89
115
-
0.5
-
-
-
-
-
-
-
-
VOC2
10
MAX UNITS
+2.0
-
-
-
-
80
-
%
nA
%
%
k
%
%
8
4
8
3
92 %
120 %
1 µA
1V
260 µA
20 µA
0.8 V
-V
0.1 V
-V
0.8
-
1.01*
VOC2
12
V
V
V
mΑ
4

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6227CAZ 전자부품, 판매, 대치품
ISL6227
Typical Operation Performance (Continued)
Vin1
Vo1
Vo2
www.DataSheet4U.com
FIGURE 13. INPUT STEP-DOWN TRANSIENT AT PWM MODE
Vin1
Vo1
Vo2
FIGURE 14. INPUT STEP-DOWN TRANSIENT AT HYS MODE
EN1
PG1
SOFT1
Vo1
FIGURE 15. SOFT-START INTERVAL AT ZERO INITIAL
VOLTAGE OF VO
Vo1
Vphase1
Ilo1
Vo2
FIGURE 17. OPERATION AT LIGHT LOAD OF 100 MA,
CHANNEL 1
7
EN1
PG1
SOFT1
Vo1
FIGURE 16. SOFT-START INTERVAL WITH NON-ZERO INITIAL
VOLTAGE OF VO
Vo1
Vphase1
Ilo1
Vo2
FIGURE 18. OPERATION AT HEAVY LOAD OF 4A,
CHANNEL 1

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관련 데이터시트

부품번호상세설명 및 기능제조사
6227CA

ISL6227CA

Intersil Corporation
Intersil Corporation
6227CAZ

ISL6227CAZ

Intersil Corporation
Intersil Corporation

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