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Linear Technology Electronic Components Datasheet

LT1931A Datasheet

1.2MHz/2.2MHz Inverting DC/DC Converters

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


Linear Technology Electronic Components Datasheet

LT1931A Datasheet

1.2MHz/2.2MHz Inverting DC/DC Converters

No Preview Available !

LT1931/LT1931A
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage .............................................................. 16V
SW Voltage ................................................– 0.4V to 36V
NFB Voltage ............................................................. – 2V
Current Into NFB Pin ............................................ ±1mA
SHDN Voltage .......................................................... 16V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SW 1
GND 2
NFB 3
5 VIN
4 SHDN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 150°C/ W
ORDER PART NUMBER S5 PART MARKING
LT1931ES5
LT1931AES5
LT1931IS5
LT1931AIS5
LTRA
LTSP
LTBZF
LTBZG
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 3V, VSHDN = VIN, unless otherwise noted. (Note 2)
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
Feedback Voltage
CONDITIONS
NFB Pin Bias Current
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
VNFB = –1.255V
VSHDN = 2.4V, Not Switching
VSHDN = 0V, VIN = 3V
2.6V VIN 16V
Maximum Duty Cycle
Switch Current Limit
(Note 3)
Switch VCESAT
Switch Leakage Current
SHDN Input Voltage, High
ISW = 1A
VSW = 5V
SHDN Input Voltage, Low
SHDN Pin Bias Current
VSHDN = 3V
VSHDN = 0V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1931E/LT1931AE are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the – 40°C to 85°C
LT1931
MIN TYP MAX
LT1931A
MIN TYP MAX
2.45 2.6
2.45 2.6
16 16
– 1.275 – 1.255 – 1.235 –1.275 –1.255 –1.235
– 1.280
– 1.230 –1.280
– 1.230
48
8 16
4.2 6
5.8 8
0.01 1
0.01 1
0.01 0.05
0.01 0.05
1 1.2
0.85
1.4
1.6
1.8 2.2 2.6
1.6 2.9
84 90
75 82
1 1.2 2
1 1.2 2.5
400 600
400 600
0.01 1
0.01 1
2.4 2.4
0.5 0.5
16 32
0 0.1
35 70
0 0.1
UNITS
V
V
V
V
µA
mA
µA
%/V
MHz
MHz
%
A
mV
µA
V
V
µA
µA
operating temperature range are assured by design, characterization and
correlation with statistical process controls. LT1931I/LT1931AI are
guaranteed over the –40°C to 85°C temperature range.
Note 3: Current limit guaranteed by design and/or correlation to static test.
1931fa
2


Part Number LT1931A
Description 1.2MHz/2.2MHz Inverting DC/DC Converters
Maker Linear Technology
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LT1931A Datasheet PDF






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