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LM25019MRX データシート(PDF) 6 Page - Texas Instruments

部品番号 LM25019MRX
部品情報  100-mA Constant On-Time Synchronous Buck Regulator
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ホームページ  http://www.ti.com
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LM25019MRX データシート(HTML) 6 Page - Texas Instruments

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LM25019
SNVS952E – DECEMBER 2012 – REVISED NOVEMBER 2015
www.ti.com
6.5 Electrical Characteristics
Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range
unless otherwise stated. VIN = 48V unless stated otherwise. See
(1).
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
VCC SUPPLY
VCC Reg
VCC Regulator Output
VIN = 48 V, ICC = 20 mA
6.25
7.6
8.55
V
VCC Current Limit
VIN = 48 V
(2)
26
mA
VCC Undervoltage Lockout Voltage
4.15
4.5
4.9
V
(VCC Increasing)
VCC Undervoltage Hysteresis
300
mV
VCC Drop Out Voltage
VIN = 9 V, ICC = 20 mA
2.3
V
IIN Operating Current
Nonswitching, FB = 3 V
1.75
mA
IIN Shutdown Current
UVLO = 0 V
50
225
µA
SWITCH CHARACTERISTICS
Buck Switch RDS(ON)
ITEST = 100 mA, BST-SW = 7 V
0.8
1.8
Synchronous RDS(ON)
ITEST = 200 mA
0.45
1
Gate Drive UVLO
VBST − VSW Rising
2.4
3
3.6
V
Gate Drive UVLO Hysteresis
260
mV
CURRENT LIMIT
Current Limit Threshold
150
270
370
mA
Current Limit Response Time
Time to Switch Off
150
ns
Off-Time Generator (Test 1)
FB = 0.1 V, VIN = 48 V
12
µs
Off-Time Generator (Test 2)
FB = 1 V, VIN = 48 V
2.5
µs
REGULATION AND OVERVOLTAGE COMPARATORS
Internal Reference Trip Point for Switch
FB Regulation Level
1.2
1.225
1.25
V
ON
FB Overvoltage Threshold
Trip Point for Switch OFF
1.62
V
FB Bias Current
60
nA
UNDERVOLTAGE SENSING FUNCTION
UV Threshold
UV Rising
1.19
1.225
1.26
V
UV Hysteresis Input Current
UV = 2.5 V
–10
–20
–29
µA
Remote Shutdown Threshold
Voltage at UVLO Falling
0.32
0.66
V
Remote Shutdown Hysteresis
110
mV
THERMAL SHUTDOWN
Tsd
Thermal Shutdown Temperature
165
°C
Thermal Shutdown Hysteresis
20
°C
(1)
All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying
statistical process control.
(2)
VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading.
6.6 Switching Characteristics
Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range
unless otherwise stated. VIN = 48 V unless otherwise stated.
MIN
TYP
MAX
UNIT
ON-TIME GENERATOR
TON Test 1
VIN = 32 V, RON = 100 kΩ
270
350
460
ns
TON Test 2
VIN = 48 V, RON = 100 kΩ
188
250
336
ns
TON Test 4
VIN = 10 V, RON = 250 kΩ
1880
3200
4425
ns
MINIMUM OFF-TIME
Minimum Off-Timer
FB = 0 V
144
ns
6
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