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Final Electrical Specifications
LT1613 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
December 1998
FEATURES
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DESCRIPTION
The LT(R)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 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 200mA 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.
Uses Tiny Capacitors and Inductor Internally Compensated Fixed Frequency 1.4MHz Operation Operates with VIN as Low as 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: <1A Low VCESAT Switch: 300mV at 300mA 5-Lead SOT-23 Package
APPLICATIONS
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Digital Cameras Pagers Cordless Phones Battery Backup LCD Bias Medical Diagnostic Equipment Local 5V or 12V Supply External Modems PC Cards
TYPICAL APPLICATION
3.3V to 5V 200mA DC/DC Converter
L1 4.7H VIN 3.3V
100
D1 VOUT 5V 200mA
95 90
EFFICIENCY (%)
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VIN C1 15F SHDN LT1613 SHDN GND
SW
R1 374k
85 80 75 70 65 60 55 VIN = 1.5V VIN = 2.8V VIN = 3.5V
+
C2 15F
FB R2 121k
L1: MURATA LQH3C4R7M24 OR SUMIDA CD43-4R7 C1, C2: AVX TAJA156M010R D1: MBR0520
1613 * TA01
50 0 50 100 150 200 250 300 350 400 LOAD CURRENT (mA)
1613 TA01a
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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Efficiency Curve
VIN = 4.2V
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 .......................... 125C Operating Temperature Range Commercial ............................................. 0C to 70C Extended Commercial (Note 2) ........... - 40C to 85C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
LT1613CS5
S5 PACKAGE 5-LEAD PLASTIC SOT-23
S5 PART MARKING LTED
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
Commercial grade 0C to 70C, VIN = 1.5V, VSHDN = VIN, TA = 25C, 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 (Note 3) ISW = 300mA VSW = 5V 1 0.3 50 0.1 VSHDN = 1.5V, Not Switching VSHDN = 0V, VIN = 2V VSHDN = 0V, VIN = 5V 1.5V VIN 10V
q q q q
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 A A %/V MHz % mA
1.205
1.23 27 3 0 0 0.02
1.0 82 550
1.4 86 800 300 0.01
350 1
The q denotes specifications which apply over the full specified temperature range. 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 specified performance from 0C to 70C and is designed, characterized and expected to meet these extended temperature limits, but is not tested at - 40C and 85C. Guaranteed I grade parts are available, consult factory. Note 3: Current limit guaranteed by design and/or correlation to static test.
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mV A V V A A
LT1613
PIN FUNCTIONS
SW (Pin 1): Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to keep EMI down. GND (Pin 2): Ground. Tie directly to local ground plane. FB (Pin 3): Feedback Pin. Reference voltage is 1.23V. Connect resistive divider tap here. Minimize trace area at FB. Set VOUT according to VOUT = 1.23V(1 + R1/R2). SHDN (Pin 4): Shutdown Pin. Tie to 1V or more to enable device. Ground to shut down. VIN (Pin 5): Input Supply Pin. Must be locally bypassed.
BLOCK DIAGRAM
VIN 5 R5 40k VOUT R1 (EXTERNAL) FB Q1 3
gm
-
Q2 x10 R3 30k R4 140k
FB
CC A=3 1.4MHz OSCILLATOR SHDN 4 SHUTDOWN
R2 (EXTERNAL)
TYPICAL APPLICATIONS
4-Cell to 15V 60mA DC/DC Converter
6.5V TO 4V L1 4.7H D1 15V 60mA C1 15F VIN LT1613 SHDN SHDN GND FB 88.7k SW 100pF 1M
+
4-CELL
L1: MURATA LQH3C4R7M24 D1: MBR0530
+
RC
RAMP GENERATOR
-
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VIN R6 40k
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1 SW COMPARATOR FF S DRIVER Q Q3
A2
R
+
0.15
-
2 GND
1613 * BD
+
C2 15F
1613 * TA02
3
LT1613
TYPICAL APPLICATIONS
4-Cell to 5V SEPIC DC/DC Converter
6.5V TO 4V L1 22H C3 1F D1
L1, L2: MURATA LQH3C220 C3: AVX 1206YG105 CERAMIC D1: MBR0520
PACKAGE DESCRIPTION
2.60 - 3.00 (0.102 - 0.118) 1.50 - 1.75 (0.059 - 0.069) 0.00 - 0.15 (0.00 - 0.006) 0.90 - 1.45 (0.035 - 0.057) 2.80 - 3.00 (0.110 - 0.118) (NOTE 3)
0.10 - 0.60 (0.004 - 0.024) REF
0.09 - 0.20 (0.004 - 0.008) (NOTE 2)
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
RELATED PARTS
PART NUMBER LT1307 LT1317 LT1316 LT1474 LT1521 LTC1517-5 LT1610 LT1611 DESCRIPTION Single Cell Micropower DC/DC 2-Cell Micropower DC/DC Burst Mode Operation DC/DC with Programmable Current Limit Low Quiescent Current, High Efficiency Step-Down Converter 300mA Low Dropout Regulator with Micropower Quiescent Current and Shutdown Micropower, Regulated Charge Pump 1.7MHz Single Cell Micropower DC/DC Converter Inverting 1.4MHz Switching Regulator
TM
Burst Mode is a trademark of Linear Technology Corporation.
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
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4-CELL
C1 15F
VIN LT1613
SW 374k FB GND 121k L2 22H
VOUT 5V 175mA
+
SHDN
SHDN
C2 22F
1613 * TA03
Dimensions in inches (millimeters) unless otherwise noted. S5 Package 5-Lead Plastic SOT-23
(LTC DWG # 05-08-1633)
0.35 - 0.50 0.90 - 1.30 (0.014 - 0.020) (0.035 - 0.051) FIVE PLACES (NOTE 2) S5 SOT-23 0797
1.90 (0.074) REF
0.95 (0.037) REF
COMMENTS 3.3V/75mA From 1V; 600kHz Fixed Frequency 3.3V/200mA From Two Cells; 600kHz Fixed Frequency 1.5V Minimum VIN; Precise Control of Peak Switch Current 94% Efficiency, 10A IQ, 9V to 5V at 250A 500mV Dropout, 300mA Output Current, 12A IQ 3-Cells to 5V at 20mA, SOT-23 Package, 6A IQ 30A IQ, MSOP Package, Internal Compensation 5V to -5V at 150mA, Low Output Noise
1613i LT/TP 1298 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1997

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