LT1676CS8 Linear Technology, LT1676CS8 Datasheet - Page 3

• Manufacturer Part Number: LT1676CS8
• Description: IC SW REG STEP-DOWN HI-EFF 8SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT1676CS8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 51 V
• Current - Output: 700mA
• Frequency - Switching: 100kHz
• Voltage - Input: 7.4 ~ 60 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

The
TYPICAL PERFORMANCE CHARACTERISTICS
V
SYMBOL
Timing
f
t
Boost Operation
Sync Function
SHDN Pin Function
V
I
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Control circuitry powered from V
ELECTRICAL CHARACTERISTICS
ON(MIN)
SHDN
SHDN
IN
7.4
7.2
7.0
6.8
6.6
6.4
6.2
6.0
= 48V, V
–50
Minimum Input Voltage vs
Temperature
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
–25
SW
PARAMETER
Switching Frequency
Maximum Switch Duty Cycle
Minimum Switch On Time
V
dV/dt Below Threshold
dV/dt Above Threshold
Minimum Sync Amplitude
Synchronization Range
SYNC Pin Input R
Shutdown Mode Threshold
Upper Lockout Threshold
Lower Lockout Threshold
Shutdown Pin Current
C
Pin Boost Threshold
open, V
0
TEMPERATURE ( C)
25
CC
50
= 5V, V
75
W
C
100
= 1.4V unless otherwise noted.
LT1676 G01
CC
.
U
125
1.50
1.25
1.00
0.75
0.50
0.25
0
Switch-On Voltage vs
Switch Current
0
CONDITIONS
High dV/dt Mode, R
Switching Action On
Switching Action Off
V
V
100
SHDN
SHDN
SWITCH CURRENT (mA)
200
= 0V
= 1.25V
– 55 C
125 C
300
Note 3: Switch current limit is DC trimmed and tested in production.
Inductor dl/dt rate will cause a somewhat higher current limit in actual
application.
Note 4: Minimum switch on time is production tested with a 50 resistive
load to ground.
400
25 C
L
= 50 (Note 4)
500
600
1676 G02
700
1000
800
600
400
200
0
0
Switch Current Limit vs
Duty Cycle
T
MIN
A
130
10
0.2
90
85
85
= 25 C
20
30
1.260
1.245
DUTY CYCLE (%)
1.35
TYP
100
300
0.2
1.6
1.5
0.5
2.5
90
40
12
40
A
50
= 25 C.
60
MAX
LT1676
110
115
250
2.2
0.8
20
10
70
80
UNITS
90
1676 G03
3
V/ns
V/ns
kHz
kHz
kHz
k
100
ns
%
V
V
V
V
V
V
A
A