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LM3488-Q1 Datasheet(PDF) 3 Page - Texas Instruments

Part # LM3488-Q1
Description  High Efficiency Low-Side N-Channel Controller for Switching Regulators
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM3488-Q1 Datasheet(HTML) 3 Page - Texas Instruments

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LM3488
LM3488-Q1
www.ti.com
SNVS089M – JULY 2000 – REVISED MARCH 2013
Operating Ratings
(1)
Supply Voltage
2.97V
≤ VIN ≤ 40V
Junction Temperature Range
−40°C ≤ TJ ≤ +125°C
Switching Frequency
100kHz
≤ FSW ≤ 1MHz
(1)
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics.
Electrical Characteristics
Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature
Range. Unless otherwise specified, VIN = 12V, RFA = 40kΩ
Symbol
Parameter
Conditions
Typical
Limit
Unit
VFB
Feedback Voltage
VCOMP = 1.4V,
1.26
V
2.97
≤ VIN ≤ 40V
1.2507/1.24
V(min)
1.2753/1.28
V(max)
ΔVLINE
Feedback Voltage Line Regulation
2.97
≤ VIN ≤ 40V
0.001
%/V
ΔVLOAD
Output Voltage Load Regulation
IEAO Source/Sink
±0.5
%/V (max)
VUVLO
Input Undervoltage Lock-out
2.85
V
2.97
V(max)
VUV(HYS)
Input Undervoltage Lock-out Hysteresis
170
mV
130
mV (min)
210
mV (max)
Fnom
Nominal Switching Frequency
RFA = 40KΩ
400
kHz
360
kHz(min)
430
kHz(max)
RDS1 (ON)
Driver Switch On Resistance (top)
IDR = 0.2A, VIN= 5V
16
Ω
RDS2 (ON)
Driver Switch On Resistance (bottom)
IDR = 0.2A
4.5
Ω
VDR (max)
Maximum Drive Voltage Swing(1)
VIN < 7.2V
VIN
V
VIN ≥ 7.2V
7.2
Dmax
Maximum Duty Cycle(2)
100
%
Tmin (on)
Minimum On Time
325
nsec
230
nsec(min)
550
nsec(max)
ISUPPLY
Supply Current (switching)
(3)
2.7
mA
3.0
mA (max)
IQ
Quiescent Current in Shutdown Mode
VFA/SYNC/SD = 5V
(4), V
IN = 5V
5
µA
7
µA (max)
VSENSE
Current Sense Threshold Voltage
VIN = 5V
156
mV
135/ 125
mV (min)
180/ 190
mV (max)
VSC
Short-Circuit Current Limit Sense
VIN = 5V
343
mV
Voltage
250
mV (min)
415
mV (max)
VSL
Internal Compensation Ramp Voltage
VIN = 5V
92
mV
52
mV(min)
132
mV(max)
VSL ratio
VSL/VSENSE
0.49
0.30
(min)
0.70
(max)
VOVP
Output Over-voltage Protection (with
VCOMP = 1.4V
50
mV
respect to feedback voltage) (5)
32/ 25
mV(min)
78/ 85
mV(max)
(1)
The voltage on the drive pin, VDR is equal to the input voltage when input voltage is less than 7.2V. VDR is equal to 7.2V when the input
voltage is greater than or equal to 7.2V.
(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 5V 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 © 2000–2013, Texas Instruments Incorporated
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