LT1512
W W W
U
ABSOLUTE AXI U RATI GS
/O
PACKAGE RDER I FOR ATIO
Input Voltage .......................................................... 30V
Switch Voltage........................................................ 40V
S/S Pin Voltage....................................................... 30V
FB Pin Voltage (Transient, 10ms) ......................... ±10V
ORDER PART
TOP VIEW
NUMBER
V
V
SW
1
2
3
4
8
7
6
5
C
LT1512CN8
LT1512CS8
LT1512IN8
LT1512IS8
FB
GND
I
GND S
V
FB Pin Current .................................................... 10mA
FB
S/S
V
I
FB Pin Voltage (Transient, 10ms) ......................... ±10V
IN
Storage Temperature Range ................ –65°C to 150°C
Ambient Temperature Range
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
S8 PART
MARKING
TJMAX = 125°C, θJA = 100°C/ W (N)
JMAX = 125°C, θJA = 130°C/ W (S)
LT1512C (Note 3).................................... 0°C to 70°C
LT1512I .............................................. –40°C to 85°C
Operating Junction Temperature Range
LT1512C (Note 3)............................ –20°C to 125°C
LT1512I ............................................ –40°C to 125°C
Short Circuit ......................................... 0°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
T
NOTE: CONTACT FACTORY CONCERNING 16-LEAD
FUSED-LEAD GN PACKAGE WITH LOWER THERMAL
RESISTANCE
1512
1512I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
REF
V
FB
Reference Voltage
Measured at FB Pin
V = 0.8V
C
1.233
1.228
1.245
1.245
1.257
1.262
V
V
●
FB Input Current
V
= V
300
550
600
nA
nA
FB
REF
●
●
FB Reference Voltage Line Regulation
2.7V ≤ V ≤ 25V, V = 0.8V
0.01
0.03
%/V
IN
C
V
I
Reference Voltage
Measured at I Pin
–107
–110
–100
–100
–93
–90
mV
mV
IREF
FB
FB
V
= 0V, V = 0.8V
●
●
●
FB
C
I
I
Input Current
V
= V (Note 2)
IREF
10
25
35
µA
FB
FB
IFB
Reference Voltage Line Regulation
2.7V ≤ V ≤ 25V, V = 0.8V
0.01
1500
0.05
%/V
IN
C
g
m
Error Amplifier Transconductance
∆I = ±25µA
C
1100
700
1900
2300
µmho
µmho
●
●
●
Error Amplifier Source Current
Error Amplifier Sink Current
Error Amplifier Clamp Voltage
V
V
= V – 150mV, V = 1.5V
120
200
350
µA
µA
FB
FB
REF
C
= V
+ 150mV, V = 1.5V
1400
2400
REF
C
High Clamp, V = 1V
1.70
0.25
1.95
0.40
2.30
0.52
V
V
FB
Low Clamp, V = 1.5V
FB
A
V
Error Amplifier Voltage Gain
500
1
V/V
V
V Pin Threshold
C
Duty Cycle = 0%
0.8
1.25
f
Switching Frequency
2.7V ≤ V ≤ 25V
450
430
400
500
500
550
580
580
kHz
kHz
kHz
IN
0°C ≤ T ≤ 125°C
●
●
J
–40°C ≤ T < 0°C (LT1512I)
J
Maximum Switch Duty Cycle
88
95
130
47
%
Switch Current Limit Blanking Time
Output Switch Breakdown Voltage
260
ns
BV
0°C ≤ T ≤ 125°C
●
40
35
V
V
J
–40°C ≤ T < 20°C (LT1512I)
J
2