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LTC3459 10V Micropower Synchronous Boost Converter FEATURES
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DESCRIPTION
The LTC(R)3459 is a low current, high efficiency synchronous boost converter intended for low power, size constrained portable applications. The LTC3459 can be powered from a single lithium ion battery, a 2- to 3-cell stack of alkaline or nickel batteries, or any low impedance voltage source between 1.5V and 5.5V. The output is programmable via an external divider between 2.5V and 10V. Although the part is primarily intended for boost applications, VOUT will maintain regulation below VIN (at reduced efficiency). The LTC3459 offers Burst Mode operation with a fixed peak current, providing high conversion efficiency over a wide range of load currents. During start-up, inductor current is controlled preventing the inrush surge current found in many boost converters. In shutdown the output is disconnected from the input and quiescent current is reduced to <1A. The LTC3459 is offered in low profile 6-pin 2mm x 2mm DFN, 2mm x 3mm DFN or SOT-23 (ThinSOT TM) packages, allowing a tiny footprint for the total solution.
, LT, LTC, LTM and Burst Mode 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.
Small Solution Size >85% Efficiency over Wide Load Range Internal Synchronous Rectifier VIN Range: 1.5V to 5.5V 5V at 30mA from 3.3V Input 3.3V at 20mA from 2 AA Cell Input Programmable Output Voltages Up to 10V Burst Mode(R) Operation Inrush Current Limiting Output Disconnect in Shutdown Ultralow Quiescent (10A) and Shutdown (<1A) Currents Low Profile 2mm x 2mm DFN, 2mm x 3mm DFN or SOT-23 Package
APPLICATIONS
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General Purpose Micropower Boost Digital Cameras PDAs LCD Bias Small OLED Displays Supercap Charging
TYPICAL APPLICATION
5V to 8V Converter
100 22H 90 EFFICIENCY (%) SW 5V VIN VOUT 2M FB 365k
3459 TA01a
Efficiency
VIN = 5V VOUT = 8V
LTC3459 1F OFF ON SHDN GND
47pF 4.7F
VOUT 8V 30mA
80
70
60
50 0.01
0.1
1 ILOAD (mA)
10
100
3459 TA01b
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LTC3459 ABSOLUTE MAXIMUM RATINGS
Referred to GND (Note 1)
VIN, FB Voltage ........................................... -0.3V to 7V VOUT, SHDN Voltage ................................. -0.3V to 10V SW Voltage .............................................. -0.3V to 12V Operating Temperature Range (Notes 2, 3) ......................................... -40C to 85C
Storage Temperature Range.................. -65C to 150C Reflow Temperature .............................................. 260C Lead Temperature, S6 Package (Soldering, 10 sec) .......................................... 300C
PIN CONFIGURATION
TOP VIEW VIN 1 VOUT 2 SHDN 3 7 6 SW 5 GND 4 FB SHDN 1 VOUT 2 FB 3 7 TOP VIEW TOP VIEW 6 VIN 5 GND 4 SW SW 1 GND 2 FB 3 6 VIN 5 VOUT 4 SHDN
DC PACKAGE 6-LEAD (2mm 2mm) PLASTIC DFN TJMAX = 125C, JA = 102C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
DCB PACKAGE 6-LEAD (2mm x 3mm) PLASTIC DFN TJMAX = 125C, JA = 64C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125C, JA = 192C/W
ORDER INFORMATION
LEAD FREE FINISH LTC3459EDC#PBF LTC3459EDCB#PBF LTC3459ES6#PBF TAPE AND REEL LTC3459EDC#TRPBF LTC3459EDCB#TRPBF LTC3459ES6#TRPBF PART MARKING LDTG LDMM LTAHA PACKAGE DESCRIPTION Low Profile (2mm x 2mm) Plastic DFN Low Profile (2mm x 3mm) Plastic DFN Low Profile SOT-23 TEMPERATURE RANGE -40C to 85C -40C to 85C -40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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LTC3459 ELECTRICAL CHARACTERISTICS
PARAMETER VIN Input Voltage Range VIN Quiescent Current VIN Shutdown Current VOUT Programmable Voltage Range VOUT Quiescent Supply Current VOUT Shutdown Current Reference Feedback Voltage FB Input Leakage Current Converter Performance Peak Switch Current (VIN = 3.3V) tOFF Timer (VIN = 3.3V, VOUT = 5V) Zero Current Comparator Threshold Main NMOS Switch On-Resistance Leakage Current Main PMOS Switch On-Resistance Leakage Current Logic Inputs SHDN Threshold (Rising Edge) SHDN Hysteresis SHDN Input Leakage Current SHDN = 3.3V 0.3 80 0 50 1 V mV nA VOUT = 5V VIN = 5V, VSWITCH = 5V, VOUT = 0V 4.2 0.02 2 A VOUT = 5V VSWITCH = 10V, VOUT = 10V 2.8 0.01 1 A L = 22H Varies by 1/(VOUT - VIN) L = 22H
l l l
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 3.3V, VOUT = 5V, unless otherwise noted.
CONDITIONS MIN 1.5 10 0.1 2.5 2 0.1
l
TYP
MAX 5.5 20 1 10 4 1 1.25 50 90 550
UNITS V A A V A A V nA mA ns mA
SHDN = VCC SHDN = GND
SHDN = VCC SHDN = GND VIN = 3.3V, VOUT = 7.5V Measured on FB 60 225 1.19
1.22 10 75 400 0
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3459E is guaranteed to meet performance specifications from 0C to 85C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.
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LTC3459 TYPICAL PERFORMANCE CHARACTERISTICS
Minimum ROUT vs VIN
4000 3500 3000 ROUT () 2500 2000 1500 1000 500 0 1.5 2 2.5 3 3.5 VIN (V)
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(TA = 25C, unless otherwise noted). VIN and VOUT Quiescent Current vs Temperature
16 VIN = 3.3V 14 VOUT = 5V 12 CURRENT (A) IIN 10 8 6 4 2 0 -40 -20 IOUT
Maximum POUT vs VIN
VOUT = 10V VOUT = 7.5V VOUT = 5V VOUT = 3.3V L = 22H POUT (mW) 400 350 300 250 200 150 100 50 VOUT = 10V VOUT = 7.5V VOUT = 5V VOUT = 3.3V L = 22H
4
4.5
5
5.5
0 1.5
2
2.5
3
3.5 VIN (V)
4
4.5
5
5.5
60 0 40 20 TEMPERATURE (C)
80
3459 G03
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Switching Frequency vs VIN at Various VOUTs
3.0 VOUT = 10V VOUT = 7.5V VOUT = 5V VOUT = 3.3V L = 22H 2.0 1.5 % CHANGE IN VOUT 1.0 0.5 0 -0.5 -1.0
VOUT Regulation vs VIN and COUT
6 4.7F 10F 22F 47F VOUT = 5V L = 22H 5
N-Channel and P-Channel MOSFET RDS(ON) vs Temperature
VOUT = 5V
2.5 FREQUENCY (MHz)
PCH 4 RDS(ON) () NCH 3 2 1
2.0
1.5
1.0
-1.5 0.5 1.5 2 2.5 3 3.5 VIN (V)
3459 G04
4
4.5
5
5.5
-2.0 1.5
2
2.5
3
3.5 VIN (V)
4
4.5
5
5.5
0 -40
-20
40 20 60 0 TEMPERATURE (C)
80
3459 G06
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Shutdown Threshold Voltage vs Temperature
1.2 SHUTDOWN THRESHOLD VOLTAGE (V) 1.0 SHDN RISING 0.8 SHDN FALLING 0.6 0.4 0.2 0 -40 INDUCTOR CURRENT 50mA/DIV SW CURRENT 50mA/DIV
Burst Cycle
Switch Pin Waveform
SW CURRENT 50mA/DIV INDUCTOR CURRENT 50mA/DIV
VIN = 3.3V VOUT = 5V L = 22H -20 40 20 60 0 TEMPERATURE (C) 80
3459 G07
1s/DIV
3459 G08
VIN = 3.3V VOUT = 5V L = 22H
100ns/DIV
3459 G09
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LTC3459 TYPICAL PERFORMANCE CHARACTERISTICS
VOUT AC Ripple
VOUT 50mV/DIV
(TA = 25C, unless otherwise noted).
Burst Cycle
Burst Cycle
SW CURRENT 50mA/DIV
SW CURRENT 50mA/DIV
INDUCTOR CURRENT 50mA/DIV
INDUCTOR CURRENT 50mA/DIV
INDUCTOR CURRENT 50mA/DIV VIN = 5V VOUT = 10V L = 22H 1s/DIV
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VIN = 3.3V VOUT = 5V L = 22H COUT = 4.7F CFF = 47pF
5s/DIV
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VIN = 2V VOUT = 10V L = 22H
1s/DIV
3459 G12
VOUT Regulated Below VIN Burst Cycle
Shorted Output
VOUT VOLTAGE 50mA/DIV
Start-Up
SW CURRENT 50mA/DIV INDUCTOR CURRENT 50mA/DIV
SW CURRENT 50mA/DIV INDUCTOR CURRENT 50mA/DIV
INPUT CURRENT 50mA/DIV VIN = 5V VOUT = 0V L = 22H 500ns/DIV
3459 G14
VIN = 5V VOUT = 3.5V L = 22H
1s/DIV
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250s/DIV VIN = 3.6V VOUT = 0V TO 8V L = 22H CIN = 2.2F
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Load Steps
Load Steps
VOUT AC RIPPLE 50mV/DIV WITH 50k (TRACE 2 GROUNDED) TO 500 (TRACE 2 = 5V)
VOUT AC RIPPLE 50mV/DIV WITH 5k (TRACE 2 GROUNDED) TO 500 (TRACE 2 = 5V)
VIN = 3.6V VOUT = 8V L = 22H COUT = 4.7F CFF = 47pF
100s/DIV
3459 G16
VIN = 3.6V VOUT = 8V L = 22H COUT = 4.7F CFF = 47pF
100s/DIV
3459 G17
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LTC3459 PIN FUNCTIONS
(DC/DCB/S6 Packages)
VIN (Pin 1/Pin 6/Pin 6): Input Supply Pin. Bypass VIN with a low ESR, ESL ceramic capacitor of at least 1F . VOUT (Pin 2/Pin 2/Pin 5): Regulated Output Voltage of the Boost Regulator. Bypass VOUT with a low ESR, ESL ceramic capacitor between 2.2F and 10F VOUT ripple . increases with smaller capacitors. SHDN (Pin 3/Pin 1/Pin 4): Master Shutdown Input. Driving SHDN low disables all IC functions and reduces quiescent current from the battery to less than 1A. This pin must be pulled above 1V to enable the IC. FB (Pin 4/Pin 3/Pin 3): Input to the Burst Mode Comparator. An external resistor divider connected between VOUT, GND and this pin sets the output voltage to: VOUT = 1.22(1 + R1/R2)
GND (Pin 5/Pin 5/Pin 2): Signal and Power Ground. Provide a short, direct PCB path between GND and the (-) side of the filter capacitors on VIN and VOUT. SW (Pin 6/Pin 4/Pin 1): Switch Pin. Connect a 15H to 33H inductor between SW and VIN. Keep PCB trace lengths as short and wide as possible to reduce EMI and voltage overshoot. If the inductor current falls to zero, the internal P-channel MOSFET synchronous rectifier is turned off to prevent reverse charging of the inductor. Exposed Pad (Pin 7/Pin 7, DC and DCB Packages Only): Ground. The Exposed Pad must be soldered to PCB.
BLOCK DIAGRAM
-
VCC N-DRIVE SDB P-DRIVE SD N-DRIVE REFOK REFERENCE SD SDB GND OFF ON
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VCC tOFF TIMER Q SD QB R Q P/~N S tOFF IPEAK IZO
SW VSELECT
VIN
IZERO DETECT
VBEST SW1
QB RD VSELECT THERMAL SD SLEEP DELAY P-DRIVE
IZO
S
Q
RD QB FB VCC IPEAK DETECT
VBEST
SHDN
3459 BD
6
+
HYSTCOMP
+
VOUT R1
VOUT
-
R2
LTC3459 OPERATION
Operation The LTC3459 synchronous boost converter utilizes a Burst Mode control technique to achieve high efficiency over a wide dynamic range. A 2.5% accurate comparator is used to monitor the output voltage (VOUT), if VOUT is above the comparator threshold, no switching occurs and only quiescent current (10A) is drawn from the power source. When VOUT drops below the comparator threshold, switching commences and the output capacitor is charged. During the on time of the switching period, inductor current is ramped through an internal N-channel MOSFET to GND until a peak current (75mA) is detected. A P-channel MOSFET connects the inductor to VOUT during the off time delivering energy to the load. The off time is controlled by an internal timer which is proportional to 1/(VOUT - VIN). Anticross conduction circuitry ensures the N- and P-channel switches are never on simultaneously. Only three power components and two feedback resistors are required to complete the design of the boost converter, an external Schottky diode is not required. The high operating frequency allows the use of low value, low profile inductors and tiny external ceramic capacitors. The boost
VOUT AC RIPPLE IPEAK tOFF N P N tOFF P N tOFF P N P IZERO WAIT SLEEP ~100mA N tOFF P N
3459 F01
converter disconnects VOUT from VIN during shutdown to avoid loading the input power source. Peak Current Overshoot The LTC3459's peak current comparator has a delay of approximately 100ns from the time inductor current reaches current limit until the internal N-channel MOSFET turns off. This delay causes the peak current to overshoot based on the inductor value and VIN, as follows (Figure 2 is based on a 65mA initial ILIMIT). V IPEAK = ILIMIT + (100ns) IN L tOFF Timer The LTC3459's tOFF timer is designed to keep the inductor current continuous during a Burst Mode switching packet, thereby increasing current capability at the output. A larger inductor value will have lower peak-to-peak current ripple, increasing the available current to the load. This improvement is offset somewhat by the reduced IPEAK overshoot. The tOFF timer is designed to maintain a relatively constant peak-to-peak current in the inductor despite VIN changes.
~50mVP-P
BURST ON
BURST ON
Figure 1. Inductor Current and VOUT Ripple Waveforms
110 100 15H 90 IPEAK (mA) 80 33H 70 60 50 1.5 tOFF (s) 4.5 5 5.5 22H 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2 2.5 3 4 3.5 VIN (V) 0 0.5 1.5 2.5 3.5 4.5 5.5 VOUT - VIN (V) 6.5 7.5 8.5
3459 F02
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Figure 2. Typical IPEAK Values
Figure 3. tOFF Times
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LTC3459 OPERATION
This is accomplished by varying the tOFF period by approximately 1/(VOUT - VIN). Due to propagation delays and a 0.6A bias current in the timer, the tOFF time can be more accurately predicted as follows: tOFF 100ns + 0.8 pF * 1.25V V -V 0.6A + OUT IN 500k
If VOUT is less than VIN, the tOFF delay is fixed at approximately 750ns.
APPLICATIONS INFORMATION
Inductor Selection An inductor with a minimum value of 15H is recommended for use with the LTC3459. Values larger than 15H will result in lower ripple current and switching frequency. High frequency ferrite core materials are strongly recommended. Some inductors meeting these requirements are listed in Table 1.
Table 1. Example Inductors
VENDOR/PART Chip Inductors Murata LQH31C LQH32C-Low Profile Taiyo Yuden LB2016 22 22 15 22 33 15 22 33 15 22 15 22 33 15 22 33 15 22 33 3/160 0.7/250 0.7/130 1/105 1.7/85 1.7/180 2.5/160 3.8/130 0.86/650 1.2/500 0.4/700 0.5/500 0.74/450 3.2 x 1.6 x 1.8 3.2 x 2.5 x 1.6 2.0 x 1.6 x 1.6 www.murata.com L DCR ()/ (H) IMAX (mA) DIMENSIONS (mm) CONTACT INFORMATION
Capacitor Selection The boost converter requires two capacitors. The input capacitor should be an X5R type of at least 1.0F The VOUT . capacitor should also be an X5R type between 2.2F and 10F A larger capacitor should be used if lower peak-to. peak output ripple and better line regulation is desired.
Table 2. Capacitor Vendor Information
SUPPLIER AVX Murata Taiyo Yuden TDK PHONE (803) 448-9411 (714) 852-2001 (408) 573-4150 (847) 803-6100 WEBSITE www.avxcorp.com www.murata.com www.t-yuden.com www.component.tdk.com
www.t-yuden.com (408) 573-4150
PCB Layout Guidelines The high speed operation of the LTC3459 demands careful attention to board layout. You will not get advertised performance with a careless layout. Figure 4 shows the recommended component placement for the TSOT version of the part. A large ground pin copper area will help to lower the chip temperature.
RECOMMENDED COMPONENT PLACEMENT. TRACES CARRYING CURRENT ARE DIRECT. TRACE AREA AT FB PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT
Toko LLB2520
2.5 x 2.0 x 1.6
www.tokoam.com (847) 297-0070
Coilcraft DO3314 DO1606T
3.3 x 3.3 x 1.4 6.5 x 5.3 x 2.0
www.coilcraft.com (847) 639-6400
Sumida CMD4D06 CDRJ2D1BLD
0.5/400 6.6 x 5.8 x 0.8 0.8/300 1.3/240 0.175/350 3.2 x 3.2 x 2.0 0.255/300 0.37/240
www.sumida.com (847) 956-0666
VIN
1 2 3
SW
VIN 6
GND VOUT 5 FB SHDN 4 SHDN
VOUT
3459 F04
Figure 4. Recommended Component Placement for a Single-Layer Board
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LTC3459 TYPICAL APPLICATIONS
Very low operating quiescent current and synchronous operation allow for greater than 85% conversion efficiency in many applications. Lower output voltages will result in lower efficiencies since the N- and P-channel RDS(ON)s will increase. The switching frequency and output power capability of the LTC3459 are also dependant on input and output voltages. Charging a SuperCap(R) SuperCaps have become a popular alternative to NiCd batteries as back-up power sources in portable equipment. Capacitance values of one farad and higher are achievable in small package sizes with leakage currents in the low microamps. SuperCaps are typically charged at low currents for several minutes until they reach the required back-up voltage. The LTC3459 is designed to control peak inductor current when VIN is greater than or less than VOUT. This allows current to be controlled during start-up in a boost application, for example, or VOUT to be regulated below VIN when powered from a fresh battery. Peak current control makes the LTC3459 an ideal candidate for charging a back-up source such as a SuperCap. Figure 5 shows an application where the LTC3459 is used to charge a two-farad, 5V SuperCap from a 3.3V input. A NiCd battery could be charged by the LTC3459 as well, but that application may require additional circuitry for proper charge termination. When VOUT is less than ~3.5V, the body of the internal synchronous P-channel MOSFET rectifier is connected to VIN, and the SW pin rises a diode above VIN when current is delivered to the load. While efficiency is compromised in this mode of operation, current to the SuperCap is
5V from Li-Ion Input
15H* SW VIN VOUT 1M 47pF 4.7F 332k
3459 TA04a
100
VOUT = 5V VIN = 4.2V
Li-Ion BATTERY
+
LTC3459 1F OFF ON FB SHDN GND
EFFICIENCY (%)
VIN 2.5V TO 4.2V
VOUT 5V
90
80
VIN = 2.5V
70
*COILCRAFT DO3314
60
50 0.01
0.1
1 ILOAD (mA)
10
100
3459 TA04b
10V from 3.3V or 5V Input
33H* SW VIN VOUT 2M FB 280k
3459 TA05a
100
VOUT = 10V
90 47pF 4.7F EFFICIENCY (%) VOUT 10V
VIN 3.3V TO 5V
VIN = 5V
LTC3459 1F OFF ON SHDN GND
80 VIN = 3.3V 70
*COILCRAFT DO3314
60
50 0.01
0.1
1 ILOAD (mA)
10
100
3459 TA05b
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LTC3459 TYPICAL APPLICATIONS
controlled, preventing any damaging effects of inrush current. Proper heat sinking of the package is required in this application as the die may dissipate 100mW to 200mW during initial charging. When VOUT is greater than ~3.5V, normal boost mode operation and efficiency begin, with the P-channel MOSFET acting as a synchronous switch. Average input current is a constant 50mA during charging, where the current delivered to the SuperCap varies somewhat with duty cycle. Once the SuperCap is charged to 5V, the LTC3459 begins to regulate and the input current is reduced to the amount required to support the load and/or self discharge of the SuperCap.
L1 SW VIN 1F 3.3V VOUT 1M 1F COUT 2F 332k
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VOUT 5V
+
OFF ON
LTC3459 FB SHDN GND
COUT: MAXWELL TECHNOLOGIES ULTRACAP PC5-5, 2F 5V , L1: 33H, 1.7 TAIYO YUDEN LB2016
Figure 5. Charging a SuperCap from a 3.3V Source
PACKAGE DESCRIPTION
DC Package 6-Lead Plastic DFN (2mm x 2mm)
(Reference LTC DWG # 05-08-1703)
R = 0.115 TYP 0.56 0.05 (2 SIDES) 2.00 0.10 (4 SIDES) PIN 1 CHAMFER OF EXPOSED PAD 3 0.25 0.50 BSC 1.42 0.05 (2 SIDES) 0.05 0.200 REF 0.75 0.05 1 0.25 0.50 BSC 1.37 0.05 (2 SIDES) 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD
(DC6) DFN 1103
0.38 4 6
0.05
0.675 0.05 2.50 0.05 1.15 0.05 0.61 0.05 (2 SIDES) PACKAGE OUTLINE
PIN 1 BAR TOP MARK (SEE NOTE 6)
0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
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LTC3459 PACKAGE DESCRIPTION
DCB Package 6-Lead Plastic DFN (2mm x 3mm)
(Reference LTC DWG # 05-08-1715)
2.00 0.10 (2 SIDES) 0.70 0.05 R = 0.115 TYP R = 0.05 TYP 0.40 0.10 4 6
3.55 0.05
1.65 0.05 (2 SIDES)
PACKAGE OUTLINE
3.00 0.10 (2 SIDES)
1.65 0.10 (2 SIDES) PIN 1 NOTCH R0.20 OR 0.25 x 45 CHAMFER 3 1
(DCB6) DFN 0405
2.15 0.05 PIN 1 BAR TOP MARK (SEE NOTE 6) 0.25 0.05 0.50 BSC 1.35 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (TBD) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
0.200 REF
0.75 0.05
0.25 0.05 0.50 BSC
1.35 0.10 (2 SIDES) 0.00 - 0.05 BOTTOM VIEW--EXPOSED PAD
5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
S6 Package 6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62 MAX 0.95 REF 2.90 BSC (NOTE 4)
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4) PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.95 BSC
0.30 - 0.45 6 PLCS (NOTE 3)
0.80 - 0.90 0.20 BSC 1.00 MAX DATUM `A' 0.01 - 0.10
0.30 - 0.50 REF
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING
0.09 - 0.20 (NOTE 3)
1.90 BSC
S6 TSOT-23 0302 REV B
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
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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.
11
LTC3459 TYPICAL APPLICATION
3.3V from a 2 AA Alkaline Input
L1 15H SW 100
VOUT = 3.3V
VIN 1.8V TO 3V
LTC3459 SHDN GND FB
EFFICIENCY (%)
+
2 AA CELLS
C1 2.2F OFF ON
VIN
VOUT R1 604k R2 365k
C2 47pF
VOUT 3.3V C3 4.7F
90 VIN = 3V 80 VIN = 1.8V
+
70
3459 TA06a
60 C1: TDK C1608X5R1A225MT C2: TDK C0603COG1E470J C3: TDK C2012X5ROJ475K L1: COILCRAFT DO3314-153MXB R1: PANASONIC ERJ3EKF6043V R2: PANASONIC ERJ3EKF3653V
50 0.01
0.1
1 ILOAD (mA)
10
100
3459 TA06b
RELATED PARTS
PART NUMBER DESCRIPTION LT1310 LT1613 LT1615/ LT1615-1 LT1618 LT1944 (Dual) LT1945 (Dual) LT1946/ LT1946A LT1949/ LT1949-1 LT1961 LTC3400/ LTC3400B LTC3401 LTC3402 LTC3425 LTC3429 LT3460 LT3464 1.5A ISW, 4.5MHz, High Efficiency Step-Up DC/DC Converter 550mA ISW, 1.4MHz, High Efficiency Step-Up DC/DC Converter 300mA/80mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter 1.5A ISW, 1.4MHz, High Efficiency Step-Up DC/DC Converter Dual Output 350mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter Dual Output Pos/Neg 350mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter 1.5A ISW, 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converter 550mA ISW, 600kHz/1.1MHz, High Efficiency Step-Up DC/DC Converter 1.5A ISW, 1.25MHz, High Efficiency Step-Up DC/DC Converter 600mA ISW, 1.2MHz, Synchronous Step-Up DC/DC Converter 1A ISW, 3MHz, Synchronous Step-Up DC/DC Converter 2A ISW, 3MHz, Synchronous Step-Up DC/DC Converter 5A ISW, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter, QFN32 600mA, 500kHz, Synchronous Step-Up DC/DC Converter with Output Disconnect and Soft-Start 320mA ISW, 1.3MHz, High Efficiency Step-Up DC/DC Converter 85mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC Converter with Integrated Schottky/Output Disconnect COMMENTS VIN: 2.75V to 18V, VOUT(MAX) = 35V, IQ = 12mA, ISD < 1A, MS10E VIN: 0.9V to 10V, VOUT(MAX) = 34V, IQ = 3mA, ISD < 1A, ThinSOT VIN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20A, ISD < 1A, ThinSOT VIN: 1.6V to 18V, VOUT(MAX) = 35V, IQ = 1.8mA, ISD < 1A, MS10 VIN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20A, ISD < 1A, MS10 VIN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20A, ISD < 1A, MS10 VIN: 2.45V to 16V, VOUT(MAX) = 34V, IQ = 3.2mA, ISD < 1A, MS8 VIN: 1.5V to 12V, VOUT(MAX) = 28V, IQ = 4.5mA, ISD < 25A, SO-8, MS8 VIN: 3V to 25V, VOUT(MAX) = 35V, IQ = 0.9mA, ISD < 6A, MS8E VIN: 0.5V to 5V, VOUT(MAX) = 5V, IQ = 19A/300A, ISD < 1A, ThinSOT VIN: 0.5V to 5V, VOUT(MAX) = 6V, IQ = 38A, ISD < 1A, MS10 VIN: 0.5V to 5V, VOUT(MAX) = 6V, IQ = 38A, ISD < 1A, MS10 VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 12A, ISD < 1A, VIN: 0.5V to 5V, VOUT(MAX) = 5V, IQ = 20A/300A, ISD < 1A, ThinSOT VIN: 0.5V to 5V, VOUT(MAX) = 5V, IQ = 20A/300A, ISD < 1A, ThinSOT VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25A, ISD < 1A, ThinSOT
3459fc
12 Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
LT 1208 REV C * PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2007

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