LT1767EMS8#PBF Linear Technology, LT1767EMS8#PBF Datasheet - Page 3

IC SW REG STEP-DWN 1.25MHZ 8MSOP

LT1767EMS8#PBF

Manufacturer Part Number
LT1767EMS8#PBF
Description
IC SW REG STEP-DWN 1.25MHZ 8MSOP
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LT1767EMS8#PBF

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.2 ~ 20 V
Current - Output
1.5A
Frequency - Switching
1.25MHz
Voltage - Input
3 ~ 25 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Dc To Dc Converter Type
Step Down
Pin Count
8
Input Voltage
25V
Output Voltage
1.2 to 20V
Switching Freq
1.4MHz
Output Current
1.5A
Package Type
MSOP
Output Type
Adjustable
Switching Regulator
Yes
Mounting
Surface Mount
Input Voltage (min)
3V
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Primary Input Voltage
25V
No. Of Outputs
1
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Supply Voltage Range
3V To 25V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Compliant

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ELECTRICAL CHARACTERISTICS
The
V
PARAMETER
FB Input Resistance
Error Amp Voltage Gain
Error Amp Transconductance
V
V
V
V
V
Maximum Switch Duty Cycle
Minimum Boost Voltage Above Switch
Boost Current
SHDN Threshold Voltage
SHDN Input Current (Shutting Down)
SHDN Threshold Current Hysteresis
SYNC Threshold Voltage
SYNC Input Frequency
SYNC Pin Resistance
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1767E is guaranteed to meet performance specifications
from 0 C to 125 C. Specifications over the – 40 C to 125 C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
TYPICAL PERFORMANCE CHARACTERISTICS
C
C
C
C
C
IN
Pin Source Current
Pin Sink Current
Pin to Switch Current Transconductance
Pin 1.5A I
Pin Minimum Switching Threshold
1.22
1.21
1.20
1.19
1.18
= 15V, V
–50
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
FB vs Temperature (Adj)
–25
SW
C
= 0.8V, Boost = V
Threshold
0
TEMPERATURE ( C)
25
50
IN
75
W
+ 5V, SHDN, SYNC and switch open unless otherwise noted.
100
U
1767 G01
CONDITION
LT1767-1.8
LT1767-2.5
LT1767-3.3
LT1767-5
0.4V < V
V
V
Duty Cycle = 0%
V
I
I
I
SHDN = 60mV Above Threshold
SHDN = 100mV Below Threshold
I
125
SW
SW
SW
SYNC
FB
FB
C
I
VC
= 1.2V, I
= V
= V
= –1.5A, 0 C T
= – 0.5A (Note 4)
= –1.5A, 0 C T
= 10 A
= 1mA
NOM
NOM
C
400
350
300
250
200
150
100
< 0.9V
50
SW
– 17%
+ 17%
0
0
Switch On Voltage Drop
= 400mA
A
A
SWITCH CURRENT (A)
125 C and –1.3A, T
125 C and –1.3A, T
0.5
LT1767-2.5/LT1767-3.3/LT1767-5
Note 3: Minimum input voltage is defined as the voltage where the internal
regulator enters lockout. Actual minimum input voltage to maintain a
regulated output will depend on output voltage and load current. See
Applications Information.
Note 4: Current flows into the BOOST pin only during the on period of the
switch cycle.
1
125 C
–40 C
A
A
25 C
< 0 C
< 0 C (Note 4)
1767 G02
1.5
LT1767/LT1767-1.8/
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
–50
Oscillator Frequency
10.5
14.7
1.27
MIN
150
500
1.5
–25
19
29
80
70
85
80
– 7
4
0
TEMPERATURE ( C)
27.5
0.35
1.33
TYP
–10
350
850
120
110
2.5
0.9
1.8
1.5
15
21
42
90
10
30
20
7
25
50
MAX
1300
1.40
160
180
–13
2.7
2.2
A
21
30
39
60
15
45
10
2
75
= 25 C.
sn1767 1767fas
100
UNITS
1767 G03
3
Mho
MHz
A/V
mA
mA
k
k
k
k
k
125
%
%
A
A
V
V
V
V
A
A
V

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