lt1976 Linear Technology Corporation, lt1976 Datasheet - Page 2

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

ABSOLUTE AXI U RATI GS
LT1976/LT1976B
(Note 1)
V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, C
Operating JunctionTemperature Range
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
operating temperature range, otherwise specifications are at T
FB/PGFB = 1.25V, C
SYMBOL
V
I
I
I
I
I
V
I
2
ELECTRICAL CHARACTERISTICS
SHDN
VINS
VIN
BIASS
BIAS
FB
SHDN
REF
IN
LT1976EFE/LT1976BEFE (Note 2) ... – 40°C to 125°C
LT1976IFE/LT1976BIFE (Note 2) ..... – 40°C to 125°C
LT1976HFE (Note 2) ........................ – 40°C to 140°C
, SHDN, PG, BIAS .............................................. 60V
SS
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) (LT1976)
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
V
C
C
C
, PGFB, FB ................................................ 6V
to SW g
High Clamp
Switching Threshold (LT1976B)
SS
m
W
m
/SYNC = 0V unless otherwise noted.
REF
W W
)
U
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
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
C
C
IN
= 0.8V (V
= 0.8V (V
BOOST
= 12V, SHDN = 12V, BOOST = 15.3V, BIAS = 5V,
GND
MUST BE SOLDERED TO GND (PIN 8)
SW
V
NC
NC
NC
C
IN
θ
T
EXPOSED PAD IS GND (PIN 17)
JA
16-LEAD PLASTIC TSSOP
C
C
= 45°C/W, θ
1
2
3
4
5
6
7
8
= 0V LT1976B)
= 0V LT1976B)
FE PACKAGE
TOP VIEW
17
JC(PAD)
= 10°C/W
16
15
14
13
12
11
10
●
●
●
●
●
●
●
●
●
9
PG
SHDN
SYNC
PGFB
FB
V
BIAS
C
C
SS
1.225
MIN
400
1.2
2.1
0.1
20
15
U
1.25
TYP
FE PART MARKING
170
110
700
900
650
1.3
2.4
0.1
3.2
2.6
2.7
1.8
2.2
0.4
45
40
75
40
30
5
3
ORDER PART
LT1976EFE
LT1976IFE
LT1976HFE
LT1976BEFE
LT1976BIFE
1976EFE
1976IFE
1976HFE
1976BEFE
1976BIFE
W
NUMBER
1.275
MAX
4.10
3.25
230
180
800
200
800
1.4
2.5
2.4
0.8
20
75
50
55
40
3
2
3
UNITS
1976bfg
μMho
U
A/V
V/V
mA
mA
mA
μA
μA
μA
μA
μA
μA
nA
μA
μA
V
V
V
V
V
V
V