LT1945EMS Linear Technology, LT1945EMS Datasheet - Page 3

• Manufacturer Part Number: LT1945EMS
• Description: IC DC/DC CONV MICRPWR DUAL10MSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost), Inverting, Flyback, Sepicr

Specifications of LT1945EMS

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 2
• Voltage - Output: 1.23 ~ 36 V
• Current - Output: 350mA
• Voltage - Input: 1.2 ~ 15 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -

TYPICAL PERFORMANCE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
SHDN Pin Current
SHDN Input Voltage High
SHDN Input Voltage Low
Switch Leakage Current
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to any Absolute Maximum
Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The LT1945E is guaranteed to meet performance specifi cations
from 0°C to 70°C junction temperature. Specifi cations over the –40°C
to 85°C operating junction temperature range are assured by design,
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
550
500
450
400
350
300
250
–50
Switch Saturation Voltage
(VCESAT)
–50
Switch Off Time
–25
–25
TEMPERATURE (°C)
0
TEMPERATURE (°C)
0
V
IN
I
I
SWITCH
SWITCH
25
= 1.2V
25
V
IN
= 12V
= 500mA
= 300mA
50
50
75
75
1945 G01
1945 G04
CONDITIONS
V
V
Switch Off, V
100
SHDN
SHDN
100
= 1.2V
= 5V
1.25
1.24
1.23
1.22
1.21
1.20
–50
FB2 Pin Voltage and
Bias Current
SW
400
350
300
250
200
150
100
50
0
–50
= 5V
A
–25
Switch Current Limit
= 25°C. V
V
IN
–25
TEMPERATURE (°C)
The
= 12V
0
VOLTAGE
CURRENT
TEMPERATURE (°C)
l
IN
0
25
denotes the specifi cations which apply over the full operating
= 1.2V, V
25
V
characterization and correlation with statistical process controls. The
LT1945I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: Bias current fl ows out of the NFB1 pin.
Note 4: Bias current fl ows into the FB2 pin.
Note 5: See Figure 1 for Switcher 1 and Switcher 2 locations.
50
IN
= 1.2V
50
SHDN
75
1945 G02
= 1.2V unless otherwise noted.
75
100
1945 G05
50
40
30
20
10
0
100
–1.25
–1.24
–1.23
–1.22
–1.21
–1.20
–50
25
23
21
19
17
15
NFB1 Pin Voltage and
Bias Current
–50
Quiescent Current
–25
V
NOT SWITCHING
MIN
FB
0.9
–25
= 1.23V
TEMPERATURE (°C)
0
TEMPERATURE (°C)
0
VOLTAGE
0.01
V
TYP
IN
2
8
25
CURRENT
= 12V
25
V
IN
50
= 1.2V
LT1945
MAX
0.25
50
12
3
5
75
75
1945 G03
1945 G06
100
UNITS
1945fa
3
5
4
3
2
1
0
100
μA
μA
μA
V
V