参数资料
型号: MAX1544ETL+
厂商: Maxim Integrated Products
文件页数: 19/42页
文件大小: 0K
描述: IC QUICK-PWM DUAL-PHASE 40-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 50
系列: Quick-PWM™
应用: 控制器,AMD Hammer
输入电压: 2 V ~ 28 V
输出数: 1
输出电压: 0.68 V ~ 1.55 V
工作温度: -40°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘
供应商设备封装: 40-TQFN-EP(6x6)
包装: 管件
Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
SHDN
VID (D0–D4)
SOFT-START
1 LSB PER R TIME CYCLE
V CORE
VROK
t VROK(START)
3ms (TYP)
Figure 2. Power-Up and Shutdown Sequence Timing Diagram
Table 2. Component Suppliers
DO NOT CARE
SOFT-SHUTDOWN
1 LSB PER 4 R TIME CYCLES
MANUFACTURER
BI Technologies
Central Semiconductor
Coilcraft
Coiltronics
Fairchild Semiconductor
International Rectifier
Kemet
Panasonic
Sanyo
Siliconix (Vishay)
Sumida
Taiyo Yuden
TDK
TOKO
PHONE
714-447-2345 (USA)
631-435-1110 (USA)
800-322-2645 (USA)
561-752-5000 (USA)
888-522-5372 (USA)
310-322-3331 (USA)
408-986-0424 (USA)
847-468-5624 (USA)
65-6281-3226 (Singapore)
203-268-6261 (USA)
408-982-9660 (USA)
03-3667-3408 (Japan)
408-573-4150 (USA)
847-803-6100 (USA)
81-3-5201-7241 (Japan)
858-675-8013 (USA)
WEBSITE
www.bitechnologies.com
www.centralsemi.com
www.coilcraft.com
www.coiltronics.com
www.fairchildsemi.com
www.irf.com
www.kemet.com
www.panasonic.com
www.secc.co.jp
www.vishay.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
Shutdown
When SHDN goes low, the MAX1544 enters low-power
shutdown mode. VROK is pulled low immediately, and
the output voltage ramps down to 0V in LSB increments
at 4 times the clock rate set by R TIME :
where f SLEW = 500kHz ? 30k ? /R TIME , V DAC is the DAC
setting when the controller begins the shutdown
sequence, and V LSB = 25mV is the DAC ’ s smallest volt-
age increment. Slowly discharging the output capacitors
by slewing the output over a long period of time
t SHDN ≤
4 ? V DAC ?
f SLEW ? ? V LSB ? ?
(4/f SLEW ) keeps the average negative inductor current
low (damped response), thereby eliminating the nega-
tive output voltage excursion that occurs when the con-
troller discharges the output quickly by permanently
turning on the low-side MOSFET (underdamped
response).
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