LT1931AES5 Linear Technology Corporation, LT1931AES5 Datasheet

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LT1931AES5

Manufacturer Part Number
LT1931AES5
Description
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Fixed Frequency 1.2MHz/2.2MHz Operation
Very Low Noise: 1mV
– 5V at 350mA from 5V Input
–12V at 150mA from 5V Input
Uses Small Surface Mount Components
Wide Input Range: 2.6V to 16V
Low Shutdown Current: <1µA
Low V
Pin-for-Pin Compatible with the LT1611
Low Profile (1mm) ThinSOT
Disk Drive MR Head Bias
Digital Camera CCD Bias
LCD Bias
GaAs FET Bias
Local Low Noise/Low Impedance Negative Supply
V
5V
IN
CESAT
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK325BJ226MM
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
Figure 1. 5V to –5V, 350mA Inverting DC/DC Converter
C1
4.7µF
Switch: 400mV at 1A
V
SHDN
IN
U
LT1931
10µH
GND
L1A
P-P
NFB
SW
Output Ripple
TM
Package
U
R1
29.4k
R2
10k
1µF
C2
C4
220pF
D1
10µH
L1B
DC/DC Converters in ThinSOT
1931 F01
C3
22µF
V
–5V
350mA
OUT
DESCRIPTIO
The LT
inverting SOT-23 current mode DC/DC converters. Both
parts include a 1A integrated switch allowing high current
outputs to be generated in a small footprint. The LT1931
switches at 1.2MHz while the LT1931A switches at 2.2MHz.
These high speeds enable the use of tiny, low cost
capacitors and inductors 2mm or less in height. The
LT1931 is capable of generating – 5V at 350mA or –12V
at 150mA from a 5V supply, while the LT1931A can
generate –5V at 300mA using significantly smaller induc-
tors. Both parts are easy pin-for-pin upgrades for higher
power LT1611 applications.
The LT1931/LT1931A operate in a dual inductor inverting
topology that filters both the input side and output side
current. Very low output voltage ripple approaching 1mV
can be achieved when ceramic output capacitors are used.
Fixed frequency switching ensures a clean output free
from low frequency noise typically present with charge
pump solutions. The low impedance output remains within
1% of nominal during large load steps. The 36V switch
allows V
The LT1931/LT1931A are available in the 5-lead ThinSOT
package.
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a
1.2MHz/2.2MHz Inverting
®
1931/LT1931A are the industry’s highest power
IN
to V
OUT
100
95
90
85
80
75
70
65
60
55
50
0
differential of up to 34V.
U
50
100
LOAD CURRENT (mA)
LT1931/LT1931A
Efficiency
150
200
250
300
1931 TA01
350
1931fa
1
P-P

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LT1931AES5 Summary of contents

Page 1

... The 36V switch allows V IN The LT1931/LT1931A are available in the 5-lead ThinSOT package. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. C2 L1B 1µ ...

Page 2

... Specifications over the – 40°C to 85° PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER LT1931ES5 LT1931AES5 LT1931IS5 LT1931AIS5 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. – ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Quiescent Current 7.0 NOT SWITCHING 6.5 6.0 LT1931A 5.5 5.0 4.5 LT1931 4.0 3.5 3.0 – – 100 TEMPERATURE (°C) 1931 G01 Current Limit 1 25°C A ...

Page 4

LT1931/LT1931A W BLOCK DIAGRA 80k 80k Q1 Q2 x10 V R3 OUT 30k (EXTERNAL) R4 (OPTIONAL) 150k NFB 3 NFB R2 (EXTERNAL) U OPERATIO The LT1931 uses a constant frequency, current mode ...

Page 5

U U APPLICATIO S I FOR ATIO LT1931A AND LT1931 DIFFERENCES: Switching Frequency The key difference between the LT1931A and LT1931 is the faster switching frequency of the LT1931A. At 2.2MHz, the LT1931A switches at nearly twice the rate of ...

Page 6

LT1931/LT1931A U U APPLICATIO S I FOR ATIO The inductors shown in Table 2 for use with the LT1931A were chosen for their small size. For better efficiency, use similar valued inductors with a larger volume. For in- stance, the ...

Page 7

U U APPLICATIO S I FOR ATIO V OUT 20mV/DIV AC COUPLED L1A L1B 0.5A/DIV AC COUPLED 200mA LOAD CURRENT 100mA 100µs/DIV Figure 4. Transient Response of Inverting Converter with 220pF Phase Lead Capacitor V OUT 0.1V/DIV ...

Page 8

LT1931/LT1931A U U APPLICATIO S I FOR ATIO V OUT 2V/DIV I IN 0.5A/DIV AC COUPLED 200µs/DIV Figure 15k 33nF OUT Input Current Peaks at 500mA V OUT ...

Page 9

U TYPICAL APPLICATIO –12V Inverting Converter L1A 10µ SHDN LT1931 C1 4.7µF NFB GND C1: TAIYO YUDEN X5R JMK212BJ475MG C2: TAIYO YUDEN X5R TMK316BJ105ML C3: TAIYO YUDEN X5R EMK325BJ106MM D1: ON ...

Page 10

LT1931/LT1931A U TYPICAL APPLICATIO S 2.2MHz –5V Converter Uses Tiny Chip Inductors L1 3.3µ SHDN R1 LT1931A 28.7k C1 2.2µF NFB GND C1: TAIYO YUDEN X5R JMK212BJ225MG C2: TAIYO YUDEN X5R LMK212BJ105MG ...

Page 11

... MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 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 10µ ...

Page 12

... LT1615 Micropower Constant Off-Time DC/DC Converter in 5-Lead ThinSOT LT1617 Micropower Inverting DC/DC Converter in 5-Lead ThinSOT LT1930/LT1930A 1.2MHz/2.2MHz, 1A Switching Regulators in 5-Lead ThinSOT Burst Mode operation 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 ● ...

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