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LM2638 bảng dữ liệu(PDF) 3 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
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LM2638 bảng dữ liệu(HTML) 3 Page - Texas Instruments

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OBSOLETE
LM2638
www.ti.com
SNVS046A – MAY 2004 – REVISED NOVEMBER 2004
Electrical Characteristics
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
IEN
EN Pin Internal Pull-up Current
60
90
140
µA
ICC
Operating VCC Current
EN = 5V, VID = 10111
6
7.5
mA
IQ_VCC
VCC Shutdown Current
EN = 0V, VID Pins Floating
1.5
3
mA
IQ_VDD
VDD Shutdown Current
EN = 0V, VID Pins Floating
4
µA
RDS_CP
CP Pin Resistance
High Side FET
100
Low Side FET
10
SWITCHING SECTION
VDACOUT
5-Bit DAC Output Voltage
(1)
N
−1.5%
N
N+1.5%
V
IVID
VID Pins Internal Pull-up Current
60
90
140
µA
fOSC
Oscillator Frequency
RT = 100 k
Ω
204
245
286
kHz
RT = 25 k
Ω
1000
DMAX
Maximum Duty Cycle
100
%
DMIN
Minimum Duty Cycle
0
%
RSNS1
SNS1 Pin Resistance to Ground
8.5
10
13
k
Ω
RDS_SRC
Gate Driver Resistance When
6
Ω
Sourcing Current
RDS_SINK
Gate Driver Resistance When
1.5
Ω
Sinking Current
VCC_TH1
VCC Power-On-Reset Threshold
4.0
4.3
V
VCC_TH2
VCC Shutdown Threshold
3.0
3.6
V
VDAC_IH
DAC Input High Voltage
3.5
V
VDAC_IL
DAC Input Low Voltage
1.3
V
GA
Error Amplifier DC Gain
76
dB
BWEA
Error Amplifier Unity Gain
5
MHz
Bandwidth
VRAMP_L
Ramp Signal Valley Voltage
1.25
V
VRAMP_H
Ramp Signal Peak Voltage
3.25
V
tSS
Soft Start Time
Clock
4096
Cycles
DSTEP_SS
Duty Cycle Step Change during
12.5
%
Soft Start
tPWGD
PWGD Response Time
SNS1 Rises from 0V to Rated
2
8.4
15
µs
Output Voltage
tPWBAD
PWGD Response Time
SNS1 Falls from Rated Output
2
3.4
10
µs
Voltage to 0V
VPWGD_HI
PWGD High Trip Point
% Above Rated Output Voltage
11.5
13
When Output Voltage
%
% Above Rated Output Voltage
5
7
9
When Output Voltage
(2)
VPWGD_LO
PWGD Low Trip Point
% Below Rated Output Voltage
2.6
6
When Output Voltage
%
% Below Rated Output Voltage
6
9.5
13
When Output Voltage
(2)
VOVP_TRP
Over-Voltage Trip Point
% SNS1 Above Rated Output
15
25
35
%
ICS+
CS+ Pin Sink Current
CS+ = 5V, CS
− = 4.8V
126
185
244
µA
(1)
The letter N stands for the typical output voltages appearing in italic boldface type in Table 1.
(2)
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.
Copyright © 2004, Texas Instruments Incorporated
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