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LM25011A-Q1 Folha de dados(PDF) 6 Page - Texas Instruments

Nome de Peças LM25011A-Q1
Descrição Electrónicos  LM25011, LM25011-Q1, LM25011A, LM25011A-Q1 42-V 2-A Constant On-Time Switching Regulator With Adjustable Current Limit
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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LM25011, LM25011-Q1, LM25011A, LM25011A-Q1
SNVS617H – APRIL 2009 – REVISED NOVEMBER 2014
www.ti.com
6.6 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. Unless otherwise stated, the following conditions apply: VIN = 12 V, RT = 50 kΩ.
(1) (2) (3)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INPUT (VIN PIN)
IIN
Input operating current
Non-switching, FB = 3 V
1200
1600
µA
UVLOVIN
VIN undervoltage lock-out threshold
VIN increasing
4.6
5.3
5.9
V
VIN undervoltage lock-out threshold hysteresis
200
mV
SWITCH CHARACTERISTICS
RDS(ON)
Buck Switch RDS(ON)
ITEST = 200 mA
0.3
0.6
UVLOGD
Gate Drive UVLO
BST-SW
2.4
3.4
4.4
V
UVLOGD Hysteresis
350
mV
Pre-charge switch voltage
ITEST = 10 mA into SW pin
1.4
V
Pre-charge switch on-time
120
ns
SOFT-START PIN
VSS
Pullup voltage
2.51
V
ISS
Internal current source
10
µA
VSS-SH
Shutdown threshold
70
140
mV
CURRENT LIMIT
VILIM
Threshold voltage at CS
–146
–130
–115
mV
CS bias current
FB = 3 V
–120
µA
CSG bias current
FB = 3 V
–35
µA
ON TIMER, RT PIN
tON - 1
On-time
VIN = 12 V, RT = 50 kΩ
150
200
250
ns
tON - 2
On-time
VIN = 32 V, RT = 50 kΩ
75
ns
tON - 3
On-time (current limit) LM25011
VIN = 12 V, RT = 50 kΩ
100
ns
tON - 3
On-time (current limit) LM25011A
VIN = 12 V, RT = 50 kΩ
200
ns
tON - 4
On-time
VIN = 12 V, RT = 301 kΩ
1020
ns
tON - 5
On-time
VIN = 9 V, RT = 30.9 kΩ
130
171
215
ns
tON - 6
On-time
VIN = 12 V, RT = 30.9 kΩ
105
137
170
ns
tON - 7
On-time
VIN = 16 V, RT = 30.9 kΩ
79
109
142
ns
OFF TIMER
tOFF
Minimum off-time (LM25011)
90
150
208
ns
Minimum off-time (LM25011A)
52
75
93
REGULATION COMPARATOR (FB PIN)
VREF
FB regulation threshold
SS pin = steady state
2.46
2.51
2.56
V
FB bias current
FB = 3 V
100
nA
POWER GOOD (PGD PIN)
Threshold at FB, with respect to VREF
FB increasing
91%
95%
Threshold hysteresis
3.3%
PGDVOL
Low state voltage
IPGD = 1 mA, FB = 0 V
125
180
mV
PGDLKG
Off state leakage
VPGD = 7 V, FB = 3 V
0.1
µA
THERMAL SHUTDOWN
TSD
Thermal shutdown
Junction temperature increasing
155
°C
Thermal shutdown hysteresis
20
°C
(1)
Current flow out of a pin is indicated as a negative number.
(2)
All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying
statistical process control.
(3)
The junction temperature (TJ in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD in watts) as follows:
TJ = TA + (PD × RθJA ) where RθJA (in °C/W) is the package thermal impedance provided in the Thermal Information section.
6
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