LT1946EMS8 Linear Technology, LT1946EMS8 Datasheet

IC DC/DC CONV W/1.5A SW 8-MSOP

LT1946EMS8

Manufacturer Part Number
LT1946EMS8
Description
IC DC/DC CONV W/1.5A SW 8-MSOP
Manufacturer
Linear Technology
Type
Step-Up (Boost)r
Datasheet

Specifications of LT1946EMS8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Current - Output
1.5A
Frequency - Switching
2.7MHz
Voltage - Input
2.45 ~ 16 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Voltage - Output
-
Power - Output
-

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
3.3V
V
IN
TFT-LCD Bias Supplies
GPS Receivers
DSL Modems
Local Power Supplies
1.5A, 36V Internal Switch
1.2MHz Switching Frequency
Integrated Soft-Start Function
Output Voltage Up to 34V
Low V
8V at 430mA from a 3.3V Input
Small 8-Lead MSOP Package
Figure 1. 3.3V to 8V, 430mA Step-Up DC/DC Converter
C1: 2.2µF, X5R OR X7R, 6.3V
C2: 2 × 10µF, X5R OR X7R, 10V
D1: MICROSEMI UPS120 OR EQUIVALENT
L1: TDK RLF5018T-4R7M1R4
470pF
2.2µF
CESAT
49.9k
OFF ON
Switch: 300mV at 1.5A (Typ)
100nF
U
SHDN
V
V
C
SS
IN
LT1946
COMP
4.7µH
GND
SW
FB
U
D1
28.7k
5.23k
1946 F01
20µF
V
8V
430mA
OUT
DESCRIPTIO
The LT
containing an internal 1.5A, 36V switch. Capable of gener-
ating 8V at 430mA from a 3.3V input, the LT1946 is ideal
for large TFT-LCD panel power supplies. The LT1946
switches at 1.2MHz, allowing the use of tiny, low profile
inductors and low value ceramic capacitors. Loop com-
pensation can be either internal or external, giving the user
flexibility in setting loop compensation and allowing opti-
mized transient response with low ESR ceramic output
capacitors. Soft-start is controlled with an external capaci-
tor, which determines the input current ramp rate during
start-up.
The 8-lead MSOP package and high switching frequency
ensure a low profile overall solution less than 1.2mm high.
All other trademarks are the property of their respective owners.
1.5A Switch and Soft-Start
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
1946 is a fixed frequency step-up DC/DC converter
DC/DC Converter with
85
80
70
65
60
50
90
75
55
0
100
U
LOAD CURRENT (mA)
Efficiency
200
1.2MHz Boost
300
400
1946 F01b
500
LT1946
1946fb
1

Related parts for LT1946EMS8

LT1946EMS8 Summary of contents

Page 1

... The 8-lead MSOP package and high switching frequency ensure a low profile overall solution less than 1.2mm high. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners ...

Page 2

... SHDN = 1.250V (Note 3) = 2.5V, Not Switching = 0V ≤ 16V 0.5V ORDER PART NUMBER TOP VIEW 8 SS LT1946EMS8 7 COMP MS8 PACKAGE MS8 PART MARKING LTUG = 125°C/W JA unless otherwise specified. (Note 2) IN MIN TYP MAX 2.45 1.230 1.250 1.270 ● ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL CONDITIONS SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current V SHDN V SHDN Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent ...

Page 4

LT1946 CTIO S V (Pin 1): Error Amplifier Output Pin. Tie external com- C pensation network to this pin, or use the internal compen- sation network by shorting the (Pin 2): Feedback ...

Page 5

U OPERATIO The LT1946 uses a constant frequency, current mode control scheme to provide excellent line and load regula- tion. Please refer to Figure 2 for the following description of the part’s operation. At the start of the oscillator cycle, ...

Page 6

LT1946 U U APPLICATIO S I FOR ATIO Capacitor Selection Low ESR (equivalent series resistance) capacitors should be used at the output to minimize the output ripple voltage. Multilayer ceramic capacitors are an excellent choice, as they have an extremely ...

Page 7

U U APPLICATIO S I FOR ATIO Compensation—Theory Like all other current mode switching regulators, the LT1946 needs to be compensated for stable and efficient operation. Two feedback loops are used in the LT1946: a fast current loop which does ...

Page 8

LT1946 U U APPLICATIO S I FOR ATIO 100 50 0 –50 100 1k 10k 25k 100k FREQUENCY (Hz) 0 –100 60° –180 –200 100 1k 10k 25k 100k FREQUENCY (Hz) Figure 5. Bode Plot of Figure 1’s Circuit GROUND ...

Page 9

U TYPICAL APPLICATIO S Low Profile, Triple Output TFT Supply (10V, –10V, 20V 3. OFF 4.7µ 100nF C1 TO C6: X5R OR X7R C1: 4.7µF, 6.3V C2: 2 × 10µF, 10V ...

Page 10

LT1946 U TYPICAL APPLICATIO 3. Efficiency 3. 100 200 300 LOAD CURRENT (mA) 10 12V Output Boost Converter ...

Page 11

... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... Dual 350mA Boost Converter Dual ±250mA Boost Converter LT1945 LT1946A 2.7MHz, 1.5A Boost DC/DC Converter LT1947 3MHz, Dual Switching Regulator ThinSOT is a trademark of Linear Technology Corporation. Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● Low Profile, Triple Output TFT Supply (8V, – 8V, 23V) ...

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