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LM3488Q-Q1 Folha de dados(PDF) 5 Page - Texas Instruments

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Nome de Peças LM3488Q-Q1
Descrição Electrónicos  High-Efficiency, Low-Side, N-Channel Controller for Switching Regulators
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM3488Q-Q1 Folha de dados(HTML) 5 Page - Texas Instruments

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LM3488, LM3488-Q1
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SNVS089N – JULY 2000 – REVISED DECEMBER 2014
Electrical Characteristics (continued)
Unless otherwise specified, VIN = 12 V, RFA = 40 kΩ, TJ = 25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Fnom
Nominal Switching Frequency
RFA = 40 KΩ
400
kHz
RFA = 40 KΩ, −40°C ≤ TJ ≤ 125°C
360
430
RDS1 (ON) Driver Switch On Resistance (top)
IDR = 0.2A, VIN= 5 V
16
Ω
RDS2 (ON) Driver Switch On Resistance (bottom)
IDR = 0.2A
4.5
Ω
VDR (max)
Maximum Drive Voltage Swing(1)
VIN < 7.2 V
VIN
V
VIN ≥ 7.2 V
7.2
Dmax
Maximum Duty Cycle(2)
100%
Tmin (on)
Minimum On Time
325
nsec
−40°C ≤ TJ ≤ 125°C
230
550
ISUPPLY
Supply Current (switching)
See (3)
2.7
mA
See (3),
−40°C ≤ TJ ≤ 125°C
3.0
IQ
Quiescent Current in Shutdown Mode
VFA/SYNC/SD = 5 V
(4), V
IN = 5 V
5
µA
VFA/SYNC/SD = 5 V
(4), V
IN = 5 V,
7
−40°C ≤ TJ ≤ 125°C
VSENSE
Current Sense Threshold Voltage
VIN = 5 V
135
156
180
mV
VIN = 5 V, −40°C ≤ TJ ≤ 125°C
125
190
VSC
Short-Circuit Current Limit Sense Voltage
VIN = 5 V
343
mV
VIN = 5 V, −40°C ≤ TJ ≤ 125°C
250
415
VSL
Internal Compensation Ramp Voltage
VIN = 5 V
92
mV
VIN = 5 V, −40°C ≤ TJ ≤ 125°C
52
132
VSL ratio
VSL/VSENSE
0.30
0.49
0.70
VOVP
Output Overvoltage Protection (with
VCOMP = 1.4 V
32
50
78
mV
respect to feedback voltage) (5)
VCOMP = 1.4 V, −40°C ≤ TJ
25
85
125°C
VOVP(HYS) Output Over-Voltage Protection
VCOMP = 1.4 V
60
mV
Hysteresis(5)
VCOMP = 1.4 V, −40°C ≤ TJ
20
110
125°C
Gm
Error Ampifier Transconductance
VCOMP = 1.4 V, IEAO = 100 µA
600
800
1000
µmho
(Source/Sink)
VCOMP = 1.4 V, IEAO = 100 µA
365
1265
(Source/Sink),
−40°C ≤ TJ ≤ 125°C
AVOL
Error Amplifier Voltage Gain
VCOMP = 1.4 V, IEAO = 100 µA
38
V/V
(Source/Sink)
VCOMP = 1.4 V, IEAO = 100 µA
26
44
(Source/Sink),
−40°C ≤ TJ ≤ 125°C
IEAO
Error Amplifier Output Current (Source/
Source, VCOMP = 1.4 V, VFB = 0 V
80
110
140
µA
Sink)
Source, VCOMP = 1.4 V, VFB = 0 V,
50
180
−40°C ≤ TJ ≤ 125°C
Sink, VCOMP = 1.4 V, VFB = 1.4 V
−100
−140
−180
µA
Sink, VCOMP = 1.4 V, VFB = 1.4 V,
−85
−185
−40°C ≤ TJ ≤ 125°C
(1)
The voltage on the drive pin, VDR is equal to the input voltage when input voltage is less than 7.2 V. VDR is equal to 7.2 V when the
input voltage is greater than or equal to 7.2 V.
(2)
The limits for the maximum duty cycle can not be specified since the part does not permit less than 100% maximum duty cycle
operation.
(3)
For this test, the FA/SYNC/SD Pin is pulled to ground using a 40K resistor .
(4)
For this test, the FA/SYNC/SD Pin is pulled to 5 V using a 40K resistor.
(5)
The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the
feedback voltage. The over-voltage thresold can be calculated by adding the feedback voltage, VFB to the over-voltage protection
specification.
Copyright © 2000–2014, Texas Instruments Incorporated
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