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LM34919 датащи(PDF) 4 Page - Texas Instruments

номер детали LM34919
подробное описание детали  Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM34919 датащи(HTML) 4 Page - Texas Instruments

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LM34919
SNOSAY2D – MAY 2007 – REVISED JUNE 2008
www.ti.com
Electrical Characteristics
Specifications with standard type are for TJ = 25°C only; limits in boldface type apply over the full Operating Junction
Temperature (TJ) range. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical
values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless
otherwise stated the following conditions apply: VIN = 12V, RON = 200kΩ. See
(1).
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Start-Up Regulator, VCC
VCCReg
VCC regulated output
6.6
7
7.4
V
VIN-VCC dropout voltage
ICC = 0 mA,
1.2
V
VCC = UVLOVCC + 250 mV
VCC output impedance
0 mA
≤ ICC ≤ 5 mA, VIN = 8V
175
VCC current limit
(2)
VCC = 0V
9.5
mA
UVLOVCC
VCC under-voltage lockout threshold
VCC increasing
5.7
V
UVLOVCC hysteresis
VCC decreasing
150
mV
UVLOVCC filter delay
100 mV overdrive
3
µs
IQ
IIN operating current
Non-switching, FB = 3V, SW = Open
0.5
0.8
mA
ISD
IIN shutdown current
RON/SD = 0V, SW = Open
75
150
µA
Switch Characteristics
Rds(on)
Buck Switch Rds(on)
ITEST = 200 mA
0.5
1.0
UVLOGD
Gate Drive UVLO
VBST - VSW Increasing
3.0
4.4
5.2
V
UVLOGD hysteresis
480
mV
Softstart Pin
VSS
Pull-up voltage
2.5
V
Internal current source
VSS = 1V
10.5
µA
Current Limit
ILIM
Threshold
Current out of ISEN
0.52
0.64
0.76
A
Resistance from ISEN to SGND
140
m
Response time
150
ns
On Timer
tON - 1
On-time
VIN = 10V, RON = 200 kΩ
2.1
2.77
3.5
µs
tON - 2
On-time
VIN = 40V, RON = 200 kΩ
700
ns
Shutdown threshold
Voltage at RON/SD rising
0.45
0.8
1.2
V
Threshold hysteresis
Voltage at RON/SD
25
mV
Off Timer
tOFF
Minimum Off-time
155
ns
Regulation and Over-Voltage Comparators (FB Pin)
VREF
FB regulation threshold
SS pin = steady state
2.440
2.5
2.550
V
FB over-voltage threshold
2.9
V
FB bias current
FB = 3V
1
nA
Thermal Shutdown
TSD
Thermal shutdown temperature
175
°C
Thermal shutdown hysteresis
20
°C
Thermal Resistance
θJA
Junction to Ambient
0 LFPM Air Flow
61
°C/W
(1)
Typical specifications represent the most likely parametric norm at 25°C operation.
(2)
VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading
4
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Copyright © 2007–2008, Texas Instruments Incorporated
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