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LT1931 数据表(PDF) 1 Page - Linear Technology

部件名 LT1931
功能描述  1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
Download  12 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1931 数据表(HTML) 1 Page - Linear Technology

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1
LT1931/LT1931A
1931fa
Fixed Frequency 1.2MHz/2.2MHz Operation
Very Low Noise: 1mVP-P Output Ripple
– 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: <1
µA
Low VCESAT Switch: 400mV at 1A
Pin-for-Pin Compatible with the LT1611
Low Profile (1mm) ThinSOT
TM Package
The LT
®1931/LT1931A are the industry’s highest power
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 1mVP-P
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 VIN to VOUT differential of up to 34V.
The LT1931/LT1931A are available in the 5-lead ThinSOT
package.
Disk Drive MR Head Bias
Digital Camera CCD Bias
LCD Bias
GaAs FET Bias
Local Low Noise/Low Impedance Negative Supply
1.2MHz/2.2MHz Inverting
DC/DC Converters in ThinSOT
Figure 1. 5V to –5V, 350mA Inverting DC/DC Converter
VIN
VIN
5V
VOUT
–5V
350mA
1931 F01
SW
L1A
10
µH
L1B
10
µH
D1
GND
LT1931
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK325BJ226MM
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
C1
4.7
µF
C3
22
µF
C2
1
µF
R2
10k
R1
29.4k
C4
220pF
NFB
SHDN
LOAD CURRENT (mA)
0
50
55
65
70
75
100
85
100
200
250
1931 TA01
60
90
95
80
50
150
300
350
Efficiency
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
, 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.


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