|
|
Part: LT1613CS5
Category:
Power Management
-> Regulators
-> Switching Regulators
-> SEPIC
Description: LT1613, 0.55A, 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
Company: Linear Technology Corporation
Datasheet: Download LT1613CS5 datasheet File size : 550 kB
Request For quote: Find where to buy LT1613CS5
Datasheet text preview:
LT1613 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
FEATURES
s s s s s s s s s s s
DESCRIPTIO
Uses Tiny Capacitors and Inductor Internally Compensated Fixed Frequency 1.4MHz Operation Operates with VIN as Low as 1.1V 3V at 30mA from a Single Cell 5V at 200mA from 3.3V Input 15V at 60mA from Four Alkaline Cells High Output Voltage: Up to 34V Low Shutdown Current: <1µA Low VCESAT Switch: 300mV at 300mA Tiny 5-Lead SOT-23 Package
The LT®1613 is the industry's first 5-lead SOT-23 current mode DC/DC converter. Intended for small, low power applications, it operates from an input voltage as low as 1.1V and switches at 1.4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Its small size and high switching frequency enables the complete DC/DC converter function to take up less than 0.2 square inches of PC board area. Multiple output power supplies can now use a separate regulator for each output voltage, replacing cumbersome quasi-regulated approaches using a single regulator and a custom transformer. A constant frequency, internally compensated current mode PWM architecture results in low, predictable output noise that is easy to filter. The high voltage switch on the LT1613 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 device can generate 5V at up to 200mA from a 3.3V supply or 5V at 175mA from four alkaline cells in a SEPIC design. The LT1613 is available in the 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s s s s s s
Digital Cameras Pagers Cordless Phones Battery Backup LCD Bias Medical Diagnostic Equipment Local 5V or 12V Supply External Modems PC Cards
TYPICAL APPLICATIO
L1 4.7µH VIN 3.3V
D1 VOUT 5V 200mA 100 95 90
EFFICIENCY (%)
+
VIN C1 15µF SHDN LT1613 SHDN GND
SW
R1 37.4k
+
C2 22µF
85 80 75 70 65 VIN = 1.5V VIN = 2.8V VIN = 3.5V
FB R2 12.1k
L1: MURATA LQH3C4R7M24 OR SUMIDA CD43-4R7 C1: AVX TAJA156M010 C2: AVX TAJB226M006 D1: MBR0520
60
1613 TA01
55 50 0 50 100 150 200 250 300 350 400 LOAD CURRENT (mA)
1613 TA01a
Figure 1. 3.3V to 5V 200mA DC/DC Converter
U
Efficiency Curve
VIN = 4.2V
U
U
1
LT1613
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
TOP VIEW SW 1 GND 2 FB 3 4 SHDN 5 VIN
VIN Voltage ..... 10V SW Voltage ...... 0.4V to 36V FB Voltage ..... VIN + 0.3V Current into FB Pin ..... ±1mA SHDN Voltage .......... 10V Maximum Junction Temperature .. 125°C Operating Temperature Range Commercial ............ 0°C to 70°C Extended Commercial (Note 2) .. 40°C to 85°C Storage Temperature Range ........ 65°C to 150°C Lead Temperature (Soldering, 10 sec)......... 300°C
LT1613CS5
S5 PACKAGE 5-LEAD PLASTIC SOT-23
S5 PART MARKING LTED
Consult factory for Industrial and Military grade parts.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Commercial grade 0°C to 70°C, VIN = 1.5V, VSHDN = VIN unless otherwise noted. (Note 2)
PARAMETER Minimum Operating Voltage Maximum Operating Voltage Feedback Voltage FB Pin Bias Current Quiescent Current Quiescent Current in Shutdown Reference Line Regulation Switching Frequency Maximum Duty Cycle Switch Current Limit Switch VCESAT Switch Leakage Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Pin Bias Current VSHDN = 3V VSHDN = 0V 25 0.01 (Note 3) ISW = 300mA VSW = 5V 1 0.3 50 0.1 VSHDN = 1.5V VSHDN = 0V, VIN = 2V VSHDN = 0V, VIN = 5V 1.5V VIN 10V
q q q q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
TYP 0.9
MAX 1.1 10 1.255 80 4.5 0.5 1.0 0.2 1.8
UNITS V V V nA mA µA µA %/V MHz % mA
1.205
1.23 27 3 0.01 0.01 0.02
1.0 82 550
1.4 86 800 300 0.01
350 1
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: The LT1613C is 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
U
W
U
U
WW
W
mV µA V V µA µA
LT1613 TYPICAL PERFOR A CE CHARACTERISTICS
Switch VCESAT vs Switch Current
700 600 500 TA = 25°C 2.00 1.75 VIN = 5V SHDN PIN BIAS CURRENT (µA) 40
SWITCHING FREQUENCY (MHz)
VCESAT (mV)
400 300 200 100 0 0 100 200 300 400 500 SWITCH CURRENT (mA) 600 700
Current Limit vs Duty Cycle
1000 900
CURRENT LIMIT (mA)
800 700 600 500 400 300 200 10 20 30
70°C 25°C
FEEDBACK PIN VOLTAGE (V)
40 50 60 DUTY CYCLE (%)
UW
40°C
Oscillator Frequency vs Temperature
50
SHDN Pin Current vs VSHDN
TA = 25°C
1.50 1.25 1.00 0.75 0.50 0.25 0 50 VIN = 1.5V
30
20
10
0 25 0 25 50 TEMPERATURE (°C) 75 100
1613 G02
0
1
2 3 4 SHDN PIN VOLTAGE (V)
5
1613 G03
1613 G01
Feedback Pin Voltage
1.25
1.24 VOLTAGE 1.23
1.22
1.21
70
80
1.20 50
25
0 25 50 TEMPERATURE (°C)
75
100
1613 G05
1613 G04
Switching Waveforms, Circuit of Figure 1
VOUT 100mV/DIV AC COUPLED V SW 5V/DIV
ISW 200mA/DIV ILOAD = 150mA 200ns/DIV
1613 G06
3
Others parts begin by lt
LT-1 LT-2 LT-3 LT-4 LT-5 LT-6 LT-7 LT-8 LT-9 LT-10 LT-11 LT-12 LT-13 LT-14 LT-15 LT-16 LT-17 LT-18 LT-19 LT-20 LT-21 LT-22 LT-23 LT-24 LT-25 LT-26 LT-27 LT-28 LT-29 LT-30 LT-31 LT-32 LT-33 LT-34 LT-35 LT-36 LT-37 LT-38 LT-39 LT-40 LT-41 LT-42 LT-43 LT-44 LT-45 LT-46 LT-47 LT-48 LT-49 LT-50 LT-51 LT-52 LT-53 LT-54 LT-55
|
|
|
