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LTC1267 Datasheet(PDF) 3 Page - Linear Technology

Part # LTC1267
Description  Dual High Efficiency Synchronous Step-Down Switching Regulators
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1267 Datasheet(HTML) 3 Page - Linear Technology

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LTC1267
LTC1267-ADJ/LTC1267-ADJ5
ELECTRICAL C
C
HARA TERISTICS
TA = 25°C, VIN = 12V, VMSHDN, VSHDN1,3,5 = 0V (Note 2), unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VFB1, 2
Feedback Voltage
LTC1267-ADJ, LTC1267-ADJ5: VIN = 9V
q
1.21
1.25
1.29
V
IFB1, 2
Feedback Current
LTC1267-ADJ, LTC1267-ADJ5
q
0.2
1
µA
VOUT
Regulated Output Voltage
3.3V Output
LTC1267: VIN = 9V, ILOAD = 700mA
q
3.23
3.33
3.43
V
5V Output
LTC1267, LTC1267-ADJ5: VIN = 9V, ILOAD = 700mA
q
4.90
5.05
5.20
V
∆VOUT
Output Voltage Line Regulation
VIN = 9V to 40V
– 40
0
40
mV
Output Voltage Load Regulation
Figure 1 Circuit
3.3V Output
5mA < ILOAD < 2.0A
q
40
65
mV
5V Output
5mA < ILOAD < 2.0A
q
60
100
mV
Burst Mode Output Ripple
ILOAD = 0A
50
mVP-P
VCC
Internal Regulator Voltage
VIN = 12V to 40V, EXT VCC = 0V, ICC = 10mA
q
4.25
4.5
4.75
V
VIN – VCC
VCC Dropout Voltage
VIN = 4V, EXT VCC = Open, ICC = 10mA
200
300
mV
IEXTVCC
EXT VCC Pin Current (Note 3)
EXT VCC = 5V, Sleep Mode
360
µA
IIN
VIN Pin Current (Note 3)
Normal
VIN = 12V, EXT VCC = 5V
320
µA
VIN = 40V, EXT VCC = 5V
550
µA
Shutdown
VIN = 12V, VMSHDN = 2V
15
µA
VIN = 40V, VMSHDN = 2V
25
µA
VEXTVCC –
EXT VCC Switch Drop
VIN = 12V, EXT VCC = 5V, ISWITCH = 10mA
200
300
mV
VCC
VPGATE –
PGate to Source Voltage (Off)
VIN = 12V
– 0.2
0
V
VIN
VIN = 40V
– 0.2
0
V
VSENSE
+
1, 2 –
Current Sense Threshold Voltage
LTC1267-ADJ, LTC1267-ADJ5
VSENSE
–
1, 2
VSENSE
–
1, 2 = 5.1V, VFB1, 2 = VOUT/4 + 25mV (Forced)
25
mV
VSENSE
–
1, 2 = 4.9V, VFB1, 2 = VOUT/4 – 25mV (Forced)
q
135
160
180
mV
VSENSE
+
3, 5 –
Current Sense Threshold Voltage
LTC1267
VSENSE
–
3, 5
VSENSE
–
3, 5 = VOUT + 100mV (Forced)
25
mV
VSENSE
–
3, 5 = VOUT – 100mV (Forced)
q
135
160
180
mV
VSHDN
Shutdown Threshold
MSHDN
0.8
1.4
2.0
V
SHDN1, 3, 5
0.6
0.8
2.0
V
IMSHDN
MSHDN Input Current
VMSHDN = 5V
12
20
µA
ICT
CT Pin Discharge Current
VOUT in Regulation
50
70
90
µA
VOUT = 0V
2
10
µA
tOFF
Off-Time (Note 4)
CT = 390pF, ILOAD = 700mA, VIN = 10V
4
5
6
µs
tr, tf
Driver Output Transition Times
CL = 3000pF (PDrive and NGate Pins), VIN = 6V
100
200
ns



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