CM3132 Ver la hoja de datos (PDF) - California Micro Devices Corp
Número de pieza
componentes Descripción
Fabricante
CM3132 Datasheet PDF : 11 Pages
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PRELIMINARY
CM3132
Application Information (cont’d)
1 PSOP-8 IC drives 1-DIMM single channel DDR-I and CPU Core VCORE rail
VCC
VCC
VREF
VDDQ
REGULATOR
VDDQ=2.5V, 1A MAX,
1A CONTINUOUS
Enable DDR
Memory
CM3132-02
PSOP-8
Enable CORE
EN_DDR
R
R
VREF
EN_CORE
CDDQ
VTT
REGULATOR
VREF=1.25V, 0.5A MAX,
0.1A CONTINUOUS
DDR-I
MEMORY
CTT
VCORE
REGULATOR
VCORE=1.5V, 1A MAX,
1A CONTINUOUS
SENSE_CORE
CCORE
CPU
CORE
+ I/O
GND
With 3.3VCC @ 1A (VDDQ), 0.1A (VTT), 1A (VCORE),
PD = (3.3-2.5) * 1.05 + (2.5-1.25) * 0.1 + (3.3-1.5) * 1 = 0.84 + 0.125 + 1.8 = 2.765W
With 3.0VCC @ 1A (VDDQ), 0.1A (VTT), 1A (VCORE),
PD = (3.0-2.5) * 1.05 + (2.5-1.25) * 0.1 + (3.0-1.5) * 1 = 0.525 + 0.125 + 1.5 = 2.15W
With 2.8VCC @ 1A (VDDQ), 0.1A (VTT), 1A (VCORE),
PD = (2.8-2.5) * 1.05 + (2.5-1.25) * 0.1 + (2.8-1.5) * 1 = 0.315 + 0.125 + 1.3 = 1.74W
Figure 6. Power Dissipation Calculations
TJUNC = TAMB + PD * (θJA)
PD = (TAMB - TJUNC ) / (θJA)
PD = (Vcc-2.5)*Iddq + (2.5-1.25)*0.1 + (Vcc-Vcore)*Icore
PD - (Vcc-2.5)*Iddq - 0.125 = (Vcc-Vcore)*Icore
Icore = [PD - (Vcc-2.5)*Iddq - 0.125] / (Vcc-Vcore)
θJA= 40 oC/W
Derating (degC/W) 40 40 40 40 40 40 40 40 40
Ambient (degC) 85 85 85 60 60 60 40 40 40
Max Power (W)
Vcc (V)
Min Vcore (V)
Max Iddq (A)
Max Icore (A)
1.6 1.6 1.6 2.3 2.3 2.3 2.8 2.8 2.8
3.3 3.0 2.8 3.3 3.0 2.8 3.3 3.0 2.8
1.5 1.5 1.5 1.5 1.4 1.0 1.5 1.2 1.1
1.0 0.8 0.5 1.0 1.0 1.0 1.0 1.0 1.0
0.4 0.7 1.0 0.7 1.0 1.0 1.0 1.0 1.4
θJA= 60 oC/W
Derating (degC/W) 60 60 60 60 60 60 60 60 60
Ambient (degC) 85 85 85 60 60 60 40 40 40
Max Power (W)
Vcc (V)
Min Vcore (V)
Max Iddq (A)
Max Icore (A)
1.1 1.1 1.1 1.5 1.5 1.5 1.8 1.8 1.8
3.3 3.0 2.8 3.3 3.0 2.8 3.3 3.0 2.8
1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.4
0.3 0.5 0.6 1.0 0.7 0.5 0.5 0.7 1.0
0.4 0.5 0.6 0.3 0.7 0.9 0.7 1.0 1.0
θJA= 80 oC/W
Derating (degC/W) 80 80 80 80 80 80 80 80 80
Ambient (degC) 85 85 85 60 60 60 40 40 40
Max Power (W)
Vcc (V)
Min Vcore (V)
Max Iddq (A)
Max Icore (A)
0.8 0.8 0.8 1.1 1.1 1.1 1.4 1.4 1.4
3.3 3.0 2.8 3.3 3.0 2.8 3.3 3.0 2.8
1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
0.3 0.3 0.3 0.5 0.5 0.5 0.5 0.7 0.5
0.2 0.4 0.5 0.3 0.5 0.7 0.5 0.6 0.8
Figure 7. Power Derating Table
© 2004 California Micro Devices Corp. All rights reserved.
10 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.calmicro.com 10/13/04
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