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LM2638 Folha de dados(PDF) 4 Page - Texas Instruments

Nome de Peças LM2638
Descrição Electrónicos  LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM2638 Folha de dados(HTML) 4 Page - Texas Instruments

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OBSOLETE
LM2638
SNVS046A – MAY 2004 – REVISED NOVEMBER 2004
www.ti.com
Electrical Characteristics (continued)
VCC = 5V, VDD = 12V unless otherwise specified. Typicals and limits appearing in plain type apply for TA = TJ = +25°C. Limits
appearing in boldface type apply over the 0°C to +70°C range.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VOCP
Over-Current Trip Point (CS+ and
CS+ = 2V, CS
− Drops from 2V
41
55
69
mV
CS
− Differential Voltage)
1.5V LDO CONTROLLER SECTION
VSNS2
SNS2 Voltage
VDD = 12V, VCC = 4.75V to 5.25V,
1.463
1.5
1.538
V
IG2 = 0 mA to 20 mA
ROUT2
Output Resistance
200
Ω
ISNS2
SNS2 Pin Bias Current
When Regulating
21
μA
VPWGD_HI
PWGD High Trip Point
(2)
0.63
V
VPWGD_LO
PWGD Low Trip Point
(2)
0.44
V
1.25V LDO CONTROLLER SECTION
VSNS3
SNS3 Voltage
VDD = 12V, VCC = 4.75V to 5.25V,
1.219
1.25
1.281
V
IG3 = 0 mA to 20 mA
ROUT3
Output Resistance
200
Ω
ISNS3
SNS3 Pin Bias Current
When Regulating
0
μA
VPWGD_HI
PWGD High Trip Point
(2)
0.63
V
VPWGD_LO
PWGD Low Trip Point
(3)
0.44
V
(3)
The output level of the PWGD pin is a logic AND of the power good function of the switching section, the 1.5V section and the 1.25V
section. For the switching section, the power good is a window. For the two linear sections, the power good is a threshold with some
hysteresis.
4
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Copyright © 2004, Texas Instruments Incorporated
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