lt1976 Linear Technology Corporation, lt1976 Datasheet - Page 3

• Manufacturer Part Number: lt1976
• Description: High Voltage 1.5a, 200khz Step-down Switching Regulator With 100?a Quiescent Current
• Manufacturer: Linear Technology Corporation

operating temperature range, otherwise specifications are at T
FB/PGFB = 1.25V, C
SYMBOL
I
I
I
V
I
V
The
at T
SYMBOL
V
I
I
I
I
I
V
I
ELECTRICAL CHARACTERISTICS
PK
CSS
PGFB
CT
SHDN
VINS
VIN
BIASS
BIAS
FB
PGFB
CT
SHDN
REF
J
●
= 25°C. V
denotes the specifications which apply over the full –40°C to 140°C operating temperature range, otherwise specifications are
PARAMETER
SW Current Limit
Switch On Resistance (Note 9)
Switching Frequency
Maximum Duty Cycle
Minimum SYNC Amplitude
SYNC Frequency Range
SYNC Input Impedance
C
PGFB Input Current
PGFB Voltage Threshold (Note 11)
C
C
C
PG Leakage (Note 11)
PG Sink Current (Note 11)
PARAMETER
SHDN Threshold
SHDN Input Current
Minimum Input Voltage (Note 3)
Supply Shutdown Current
Supply Sleep Current (Note 4) (LT1976)
Supply Quiescent Current
Minimum BIAS Voltage (Note 5)
BIAS Sleep Current (Note 4)
BIAS Quiescent Current
Minimum Boost Voltage (Note 6)
Input Boost Current (Note 7)
Reference Voltage (V
FB Input Bias Current
EA Voltage Gain (Note 8)
EA Voltage g
EA Source Current
EA Sink Current
V
V
SS
T
T
T
C
C
Source Current (Note 11)
Sink Current (Note 11)
Voltage Threshold (Note 11)
to SW g
High Clamp
Current Threshold (Note 10)
IN
= 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V, FB/PGFB = 1.25V, C
SS
m
/SYNC = 0V unless otherwise noted.
m
REF
)
CONDITIONS
LT1976
LT1976B
BOOST = OPEN
SYNC = 0.5V
FB = 0V
PG = 12V
PGFB = 1V, PG = 400mV
CONDITIONS
SHDN = 12V
SHDN = 0V, BOOST = 0V, FB/PGFB = 0V
BIAS = 0V, FB = 1.35V
FB = 1.35V
BIAS = 0V, FB = 1.15V, V
BIAS = 5V, FB = 1.15V, V
SYNC = 3.3V
I
I
3.3V < V
dI(V
FB = 1.15V
FB = 1.35V
SW
SW
= 1.5A
= 1.5A
C
)= ±10μA
The
VIN
< 60V
J
●
= 25°C. V
denotes the specifications which apply over the full –40°C to 125°C
C
C
IN
= 0.8V
= 0.8V
= 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V,
SS
/SYNC = 0V unless otherwise noted.
●
●
●
●
●
●
●
●
●
●
●
●
●
LT1976/LT1976B
1.212
MIN
1.16
180
230
120
MIN
400
1.5
1.2
1.2
2.1
90
88
20
15
7
2
1
1.25
TYP
TYP
200
600
100
200
170
110
700
900
650
2.4
2.5
0.2
1.5
3.6
1.2
0.1
1.3
2.4
0.1
3.2
2.6
2.7
1.8
2.2
92
13
25
90
45
40
75
40
30
2
5
3
1.288
MAX
1.26
MAX
4.10
3.25
230
100
300
100
180
800
200
800
3.5
0.4
2.0
5.5
1.4
2.5
2.4
20
92
20
50
55
40
4
1
3
2
3
UNITS
UNITS
1976bfg
μMho
3
kHz
kHz
A/V
mA
V/V
mA
mA
mA
kΩ
μA
nA
μA
μA
μA
μA
μA
μA
μA
μA
μA
nA
μA
μA
%
%
Ω
A
A
V
V
V
V
V
V
V
V