LT1944-1EMS#TRPBF Linear Technology, LT1944-1EMS#TRPBF Datasheet - Page 3

• Manufacturer Part Number: LT1944-1EMS#TRPBF
• Description: IC DC/DC CONV STP-UP DUAL 10MSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LT1944-1EMS#TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 2
• Voltage - Output: 1.23 ~ 36 V
• Current - Output: 100mA, 175mA
• 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: Lead free / RoHS Compliant
• Power - Output: -
• Frequency - Switching: -

PI FU CTIO S
FB1 (Pin 1): Feedback Pin for Switcher 1. Set the output
voltage by selecting values for R1 and R2.
SHDN1 (Pin 2): Shutdown Pin for Switcher 1. Tie this pin
to 0.9V or higher to enable device. Tie below 0.25V to turn
it off.
GND (Pin 3): Ground. Tie this pin directly to the local
ground plane.
SHDN2 (Pin 4): Shutdown Pin for Switcher 2. Tie this pin
to 0.9V or higher to enable device. Tie below 0.25V to turn
it off.
FB2 (Pin 5): Feedback Pin for Switcher 2. Set the output
voltage by selecting values for R1B and R2B.
TYPICAL PERFOR A CE CHARACTERISTICS
2000
1800
1600
1400
1200
1000
0.15
0.13
0.10
0.08
0.05
0.03
800
600
400
200
U
0
0
–50
–50
Switch Saturation Voltage
(V
Switch Off Time
CESAT
I
SWITCH
–25
–25
U
)
= 100mA
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
SWITCHER 2
SWITCHER 1
25
25
U
I
SWITCH
50
50
W
= 70mA
75
75
1944-1 G01
1944-1 G04
U
100
100
1.25
1.24
1.23
1.22
1.21
1.20
200
175
150
125
100
75
50
–50
–50
Feedback Pin Voltage and
Bias Current
Switch Current Limit
–25
–25
V
V
V
V
IN
IN
IN
IN
TEMPERATURE ( C)
TEMPERATURE ( C)
= 12V
= 12V
= 1.2V
= 1.2V
0
0
VOLTAGE
CURRENT
25
25
SW2 (Pin 6): Switch Pin for Switcher 2. This is the
collector of the internal NPN power switch. Minimize the
metal trace area connected to the pin to minimize EMI.
PGND (Pins 7, 9): Power Ground. Tie these pins directly
to the local ground plane. Both pins must be tied.
V
capacitor as close to the device as possible.
SW1 (Pin 10): Switch Pin for Switcher 1. This is the
collector of the internal NPN power switch. Minimize the
metal trace area connected to the pin to minimize EMI.
IN
50
50
(Pin 8): Input Supply Pin. Bypass this pin with a
SWITCHER 2
SWITCHER 1
75
75
1944-1 G05
1944-1 G02
100
100
50
40
30
20
10
0
25
20
15
10
25
23
21
19
17
15
5
0
–50
Quiescent Current
Shutdown Pin Current
0
V
NOT SWITCHING
FB
–25
= 1.23V
SHUTDOWN PIN VOLTAGE (V)
TEMPERATURE ( C)
5
0
25 C
V
IN
LT1944-1
= 12V
25
V
IN
100 C
= 1.2V
10
50
75
1944-1 G03
1944-1 G03
3
100
15