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LT1432-3.3 Datasheet(PDF) 2 Page - Linear Technology

Part # LT1432-3.3
Description  3.3V High Efficiency Step-Down Switching Regulator Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1432-3.3 Datasheet(HTML) 2 Page - Linear Technology

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LT1432-3.3
VIN Pin .................................................................... 30V
V
+ Pin ..................................................................... 40V
VC ........................................................................... 35V
VLIM and VOUT Pins................................................... 7V
Diode Pin Voltage ................................................... 30V
Mode Pin Current (Note 2) ..................................... 1mA
Operating Temperature Range .................... 0
°C to 70°C
Storage Temperature Range ................ –65
°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300
°C
A
G
A
U
A
R
BSOLUTEXI
TI
S
PACKAGE/ORDER I FOR ATIO
TJMAX = 100°C, θJA = 150°C/W (N8)
TJMAX = 100°C, θJA = 170°C/W (S8)
LT1432CN8-3.3
LT1432CS8-3.3
ORDER PART
NUMBER
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Regulated Output Voltage
VC Current = 220µA
q
3.24
3.30
3.36
V
Output Voltage Line Regulation
VIN = 4V to 30V
q
520
mV
Input Supply Current (Note 1)
VIN = 4V to 30V, V
+ = V
IN + 5V, VC = VIN + 1V
q
0.3
0.5
mA
Quiescent Output Load Current
0.9
1.2
mA
Mode Pin Current
VMODE = 0V (Current Is Out of Pin)
q
30
50
µA
VMODE = 3.3V (Shutdown)
q
15
30
µA
Mode Pin Threshold Voltage
IMODE = 10µA (Out of Pin)
q
0.6
0.9
1.5
V
(Normal to Burst)
VC Pin Saturation Voltage
VOUT = 3.6V (Forced)
q
0.25
0.45
V
VC Pin Maximum Sink Current
VOUT = 3.6V (Forced)
q
0.45
0.8
1.5
mA
VC Pin Source Current
VOUT = 3.0V (Forced)
q
35
60
100
µA
Current Limit Sense Voltage (Note 3)
Device in Current Limit Loop
56
60
64
mV
VLIM Pin Current
Device in Current Limit Loop
q
30
45
70
µA
(Current Is Out of Pin)
Supply Current in Shutdown
VMODE > 3V, VIN < 30V, VC and V
+ = 0V
15
60
µA
Burst Mode Operation Output Ripple
Device in Burst Test Circuit
100
mVp-p
Burst Mode Operation Average Output Voltage
Device in Burst Test Circuit
q
3.15
3.30
3.45
V
Clamp Diode Forward Voltage
IF = 1mA, All Other Pins Open
q
0.5
0.65
V
Start-up Drive Current
VOUT = 1.5V (Forced), VIN = 4V to 26V,
q
30
45
mA
V+ = VIN – 1V, VC = VIN – 1.5V
Restart Time Delay
(Note 4)
0.7
1.2
10
ms
Transconductance, Output to VC Pin
IC = 150µA to 250µA
q
2700
3600
5000
µmho
VC = 4V, VIN = 4V, V
+ = 8V, V
DIODE = Open, VLIM = VOUT, VMODE = 0V, TJ = 25°C
Device is in standard test loop unless otherwise noted.
Consult factory for Military and Industrial grade parts.
ELECTRICAL C
C
HARA TERISTICS
1
2
3
4
TOP VIEW
VLIM
VOUT
VIN
V+
MODE
GND
VC
DIODE
N8 PACKAGE
8-LEAD PDIP
8
7
6
5
S8 PACKAGE
8-LEAD PLASTIC SO


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