LT1944EMS Linear Technology, LT1944EMS Datasheet - Page 8

• Manufacturer Part Number: LT1944EMS
• Description: IC DC/DC CONV STP-UP DUAL 10MSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LT1944EMS

• 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: -

LT1944
PART NUMBER
LT1307
LT1316
LT1317
LT1610
LT1611
LT1613
LT1615
LT1617
LT1930A
Burst Mode is a registered trademark of Linear Technology Corporation
8
TYPICAL APPLICATIO
RELATED PARTS
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone]
DESCRIPTION
Single-Cell Micropower 600kHz PWM DC/DC Converter
Burst Mode
2-Cell Micropower DC/DC with Low-Battery Detector
Single-Cell Micropower DC/DC Converter
1.4MHz Inverting Switching Regulator in 5-Lead SOT-23
1.4MHz Switching Regulator in 5-Lead SOT-23
Micropower DC/DC Converter in 5-Lead SOT-23
Micropower Inverting DC/DC Converter in 5-Lead SOT-23
2.2MHz Boost DC/DC Converter in SOT-23
TO 4.2V
4.7 F
2.7V
V
®
C1
IN
Operation DC/DC with Programmable Current Limit
U
C1: TAIYO YUDEN JMK212BJ475
C2, C6: TAIYO YUDEN LMK212BJ225
C3, C4, C7: TAIYO YUDEN EMK107BJ104
C5, C8: TAIYO YUDEN TMK316BJ105
D1, D4: ON SEMI MBR0530
D2, D3: ZETEX BAT54S
L1, L2: SUMIDA CLQ4D10-100
Q1, Q2: ON SEMI MMBT3906
Four Output Power Supply for Color LCD Displays
2
4
www.linear.com
GND
SHDN1
SHDN2
V
IN
8
3
10 H
PGND
L2
LT1944
7
10 H
L1
PGND
0.1 F
9
C3
SW1
SW2
FB1
FB2
10
6
1 F
D4
C8
0.1 F
1
5
D3A
D3B
C4
2.2 F
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
C6
D1
5 WHITE LEDs
1M
140k
Q1
D2B
D2A
140k
COMMENTS
3.3V at 75mA from One Cell, MSOP Package
1.5V Minimum, Precise Control of Peak Current Limit
3.3V at 200mA from Two Cells, 600kHz Fixed Frequency
3V at 30mA from 1V, 1.7MHz Fixed Frequency
– 5V at 150mA from 5V Input, Tiny SOT-23 Package
5V at 200mA from 3.3V Input, Tiny SOT-23 Package
20V at 12mA from 2.5V Input, Tiny SOT-23 Package
–15V at 12mA from 2.5V Input, Tiny SOT-23 Package
5V at 450mA from 3.3V, Tiny SOT-23 Package
Q2
C7
0.1 F
82.5
15mA
C5
1 F
C2
2.2 F
–6.5V
500 A
20V
500 A
10V
5mA
1944 TA03
LINEAR TECHNOLOGY CORPORATION 2001
1944f LT/TP 1001 2K • PRINTED IN USA