LT1617ES5 Linear Technology Corporation, LT1617ES5 Datasheet

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LT1617ES5

Manufacturer Part Number
LT1617ES5
Description
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
TYPICAL
LCD Bias
Handheld Computers
Battery Backup
Digital Cameras
Low Quiescent Current:
Operates with V
Low V
Uses Small Surface Mount Components
High Output Voltage: Up to – 34V
Tiny 5-Lead SOT-23 Package
2.5V TO 4.2V
20 A in Active Mode
<1 A in Shutdown Mode
CESAT
V
IN
APPLICATION
Switch: 250mV at 300mA
C1: TAIYO YUDEN LMK316BJ475
C2: TAIYO YUDEN EMK316BJ475
C3: TAIYO YUDEN TMK316BJ224
L1, L2: MURATA LQH3C220K34
D1: MOTOROLA MBR0530
1-Cell Li-Ion to –15V Inverting Converter
C1
4.7 F
IN
U
as Low as 1V
4
SHDN
V
IN
5
LT1617
22 H
GND
L1
2
SW
NFB
U
1
0.22 F
C3
3
D1
22 H
L2
267k
24.9k
DESCRIPTIO
C2
4.7 F
1617/-1 TA01
The LT
converters in a 5-lead SOT-23 package. The LT1617 is
designed for higher power systems with a 350mA current
limit and an input voltage range of 1.2V to 15V, whereas
the LT1617-1 is intended for lower power and single-cell
applications with a 100mA current limit and an extended
input voltage range of 1V to 15V. Otherwise, the two
devices are functionally equivalent. Both devices feature a
quiescent current of only 20 A at no load, which further
reduces to 0.5 A in shutdown. A current limited, fixed off-
time control scheme conserves operating current, result-
ing in high efficiency over a broad range of load current.
The 36V switch allows high voltage outputs up to – 34V to
be easily generated without the use of costly transformers.
The LT1617’s low off-time of 400ns permits the use of
tiny, low profile inductors and capacitors to minimize
footprint and cost in space-conscious portable applications.
–15V
12mA
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1617/LT1617-1 are micropower inverting DC/DC
Micropower Inverting
DC/DC Converters
80
75
70
65
60
55
50
U
0.1
LT1617/LT1617-1
LOAD CURRENT (mA)
Efficiency
V
IN
1
= 4.2V
V
IN
in SOT-23
= 2.5V
10
1617/-1 TA01a
30
1

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LT1617ES5 Summary of contents

Page 1

... The 36V switch allows high voltage outputs up to – 34V to be easily generated without the use of costly transformers. The LT1617’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications. , LTC and LT are registered trademarks of Linear Technology Corporation 0. – ...

Page 2

... 1.2V SHDN = 0V < 12V IN = –1.23V = 60mA (LT1617-1) = 300mA (LT1617 ORDER PART NUMBER TOP VIEW LT1617ES5 LT1617ES5-1 4 SHDN S5 PART MARKING S5 PACKAGE LTKF = 125 C, = 256 C/W JA LTKA = 1.2V unless otherwise noted. MIN TYP MAX 20 –1.205 –1.23 –1.255 8 0.05 1.3 2 400 85 250 ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Switch Saturation Voltage (V ) CESAT 0.60 0.55 0.50 0. 500mA SWITCH 0.40 0.35 0. 300mA SWITCH 0.25 0.20 0.15 0.10 –50 – TEMPERATURE ( ...

Page 4

LT1617/LT1617-1 W BLOCK DIAGRA 80k Q1 V OUT R1 (EXTERNAL) NFB 3 R2 (EXTERNAL) * 12mV FOR LT1617-1 U OPERATIO The LT1617 uses a constant off-time control scheme to provide high efficiencies over a wide ...

Page 5

U U APPLICATIO S I FOR ATIO Choosing an Inductor Several recommended inductors that work well with the LT1617 and LT1617-1 are listed in Table 1, although there are many other manufacturers and devices that can be used. Consult each ...

Page 6

LT1617/LT1617 APPLICATIO S I FOR ATIO tor values are used. This overshoot can be beneficial as it helps increase the amount of available output current for smaller inductor values. This will be the peak current seen by the ...

Page 7

... D1: MOTOROLA MBR0520 1.5V 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights – 5V Inverting Converter 0.47 F ...

Page 8

... Inverting Switching Regulator in 5-Lead SOT-23 LT1613 1.4MHz Switching Regulator in 5-Lead SOT-23 LT1615 Micropower DC/DC Converter in 5-Lead SOT-23 Burst Mode is a trademark of Linear Technology Corporation Linear Technology Corporation 8 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com 20V Dual Output Converter with Load Disconnect ...

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