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Linear Technology Electronic Components Datasheet

LT1930 Datasheet

1A/ 1.2MHz/2.2MHz/ Step-Up DC/DC Converters

No Preview Available !

FEATURES
s 1.2MHz Switching Frequency (LT1930)
s 2.2MHz Switching Frequency (LT1930A)
s Low VCESAT Switch: 400mV at 1A
s High Output Voltage: Up to 34V
s 5V at 480mA from 3.3V Input (LT1930)
s 12V at 250mA from 5V Input (LT1930A)
s Wide Input Range: 2.6V to 16V
s Uses Small Surface Mount Components
s Low Shutdown Current: < 1µA
s Low Profile (1mm) ThinSOTTM Package
s Pin-for-Pin Compatible with the LT1613
U
APPLICATIO S
s TFT-LCD Bias Supply
s Digital Cameras
s Cordless Phones
s Battery Backup
s Medical Diagnostic Equipment
s Local 5V or 12V Supply
s External Modems
s PC Cards
s xDSL Power Supply
, LTC and LT are registered trademarks of Linear Technology Corporation
ThinSOT is a trademark of Linear Technology Corporation.
LT1930/LT1930A
1A, 1.2MHz/2.2MHz,
Step-Up DC/DC Converters
DESCRIPTIO
in ThinSOT
The LT®1930 and LT1930A are the industry’s highest
power SOT-23 switching regulators. Both include an
internal 1A, 36V switch allowing high current outputs to be
generated in a small footprint. The LT1930 switches at
1.2MHz, allowing the use of tiny, low cost and low height
capacitors and inductors. The faster LT1930A switches at
2.2MHz, enabling further reductions in inductor size.
Complete regulator solutions approaching one tenth of a
square inch in area are achievable with these devices.
Multiple output power supplies can now use a separate
regulator for each output voltage, replacing cumbersome
quasi-regulated approaches using a single regulator and
custom transformers.
A constant frequency internally compensated current mode
PWM architecture results in low, predictable output noise
that is easy to filter. Low ESR ceramic capacitors can be
used at the output, further reducing noise to the millivolt
level. The high voltage switch on the LT1930/LT1930A is
rated at 36V, making the device ideal for boost converters
up to 34V as well as for single-ended primary inductance
converter (SEPIC) and flyback designs. The LT1930 can
generate 5V at up to 480mA from a 3.3V supply or 5V at
300mA from four alkaline cells in a SEPIC design.
The LT1930/LT1930A are available in the 5-lead ThinSOT
package.
TYPICAL APPLICATIO
L1
VIN
5V
10µH
D1
51
R1
VOUT
12V
300mA
C1
2.2µF
VIN SW
LT1930
4
SHDN SHDN
3
FB
113k
C3*
10pF
C2
4.7µF
GND R2
2 13.3k
C1: TAIYO-YUDEN X5R LMK212BJ225MG
C2: TAIYO-YUDEN X5R EMK316BJ475ML
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CR43-100
*OPTIONAL
1930/A F01
Figure 1. 5V to 12V, 300mA Step-Up DC/DC Converter
Efficiency
90
VIN = 5V
85
VIN = 3.3V
80
75
70
65
60
55
50
0 100 200 300 400
LOAD CURRENT (mA)
1930 TA01
1


Linear Technology Electronic Components Datasheet

LT1930 Datasheet

1A/ 1.2MHz/2.2MHz/ Step-Up DC/DC Converters

No Preview Available !

LT1930/LT1930A
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage .............................................................. 16V
SW Voltage ................................................– 0.4V to 36V
FB Voltage .............................................................. 2.5V
Current Into FB Pin .............................................. ±1mA
SHDN Voltage ......................................................... 10V
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
SW 1
GND 2
FB 3
TOP VIEW
5 VIN
4 SHDN
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 256°C/ W
ORDER PART
NUMBER
LT1930ES5
LT1930AES5
S5 PART MARKING
LTKS
LTSQ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q 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
CONDITIONS
LT1930
MIN TYP MAX
LT1930A
MIN TYP MAX
UNITS
Minimum Operating Voltage
2.45 2.6
2.45 2.6
V
Maximum Operating Voltage
16 16 V
Feedback Voltage
1.240 1.255 1.270 1.240 1.255 1.270
q 1.230
1.280 1.230
1.280
V
V
FB Pin Bias Current
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency
VFB = 1.255V
VSHDN = 2.4V, Not Switching
VSHDN = 0V, VIN = 3V
2.6V VIN 16V
q 120 360
240 720
4.2 6
5.5 8
0.01 1
0.01 1
0.01 0.05
0.01 0.05
1 1.2 1.4 1.8 2.2 2.6
q 0.85
1.6 1.6
2.9
nA
mA
µA
%/V
MHz
MHz
Maximum Duty Cycle
q 84
90
75 90
%
Switch Current Limit
(Note 3)
1 1.2 2
1 1.2 2.5
A
Switch VCESAT
Switch Leakage Current
SHDN Input Voltage High
ISW = 1A
VSW = 5V
400 600
400 600
0.01 1
0.01 1
2.4 2.4
mV
µA
V
SHDN Input Voltage Low
0.5 0.5 V
SHDN Pin Bias Current
VSHDN = 3V
VSHDN = 0V
16 32
0 0.1
35 70
0 0.1
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1930E/LT1930AE are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the – 40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Current limit guaranteed by design and/or correlation to static test.
2


Part Number LT1930
Description 1A/ 1.2MHz/2.2MHz/ Step-Up DC/DC Converters
Maker Linear Technology
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LT1930 Datasheet PDF






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