LINER LTC3459 10v micropower synchronous boost converter in thinsot Datasheet

LTC3459
10V Micropower
Synchronous Boost Converter
in ThinSOT
U
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
DESCRIPTIO
The LTC®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).
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® Operation
Inrush Current Limiting
Output Disconnect in Shutdown
Ultralow Quiescent (10µA) and Shutdown
(< 1µA) Currents
Low Profile (1mm) SOT-23 Package
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 <1µA.
U
APPLICATIO S
■
■
■
■
■
General Purpose Micropower Boost
Digital Cameras
PDAs
LCD Bias
Small OLED Displays
Supercap Charging
The LTC3459 is offered in a low profile (1mm) 6-pin
SOT-23 (ThinSOTTM) package allowing a tiny footprint for
the total solution.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is trademark of Linear Technology Corporation.
U
■
TYPICAL APPLICATIO
Efficiency
5V to 8V Converter
100
22µH
VIN = 5V
VOUT = 8V
5V
VIN
VOUT
2M
LTC3459
1µF
OFF ON
VOUT
8V
30mA
SHDN
GND
FB
47pF
4.7µF
365k
3459 TA01a
EFFICIENCY (%)
90
SW
80
70
60
50
0.01
0.1
1
ILOAD (mA)
10
100
3459 TA01b
3459f
1
LTC3459
W W
W
AXI U
U
ABSOLUTE
RATI GS
U
U
W
PACKAGE/ORDER I FOR ATIO
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) ........................................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
TOP VIEW
SW 1
GND 2
FB 3
6 VIN
LTC3459ES6
5 VOUT
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
S6 PART MARKING
TJMAX = 125°C, θJA = 165°C/W, θJC = 102°C/W
LTAHA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, VOUT = 5V, unless otherwise noted.
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
CONDITIONS
MIN
●
MAX
UNITS
10
0.1
5.5
20
1
V
µA
µA
2
0.1
10
4
1
V
µA
µA
1.5
SHDN = VCC
SHDN = GND
●
TYP
2.5
SHDN = VCC
SHDN = GND
VIN = 3.3V, VOUT = 7.5V
Measured on FB
●
1.19
1.22
10
1.25
50
V
nA
L = 22µH
Varies by 1/(VOUT – VIN)
L = 22µH
●
60
225
75
400
0
90
550
mA
ns
mA
VOUT = 5V
VSWITCH = 10V, VOUT = 10V
2.8
0.01
VOUT = 5V
VIN = 5V, VSWITCH = 5V, VOUT = 0V
4.2
0.02
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3459E 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.
0.3
1
Ω
µA
2
Ω
µA
1
80
0
50
V
mV
nA
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
3459f
2
LTC3459
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Minimum ROUT vs VIN
3000
2000
1500
16
VOUT = 10V
VOUT = 7.5V
VOUT = 5V
VOUT = 3.3V
L = 22µH
350
300
POUT (mW)
2500
ROUT (Ω)
400
VOUT = 10V
VOUT = 7.5V
VOUT = 5V
VOUT = 3.3V
L = 22µH
3500
VIN and VOUT Quiescent Current
vs Temperature
Minimum POUT vs VIN
VIN = 3.3V
14 VOUT = 5V
12
CURRENT (µA)
4000
(TA = 25°C unless otherwise noted.)
250
200
150
IIN
10
8
6
1000
100
4
500
50
2
0
1.5
2
2.5
3.5
3
4
4.5
5
0
1.5
5.5
2
3
2.5
VIN (V)
3.5
4
4.5
1.5
2.0
1.5
1.0
0.5
80
N-Channel and P-Channel
MOSFET RDS(ON) vs Temperature
6
4.7µF
10µF
22µF
47µF
VOUT = 5V
L = 22µH
VOUT = 5V
5
PCH
4
RDS(ON) (Ω)
2.0
VOUT = 10V
VOUT = 7.5V
VOUT = 5V
VOUT = 3.3V
L = 22µH
60
0
40
20
TEMPERATURE (°C)
3459 G03
VOUT Regulation vs VIN and COUT
% CHANGE IN VOUT
FREQUENCY (MHz)
– 20
3459 G02
Switching Frequency
vs VIN at Various VOUTS
2.5
0
–40
5.5
VIN (V)
3459 G01
3.0
5
IOUT
0
–0.5
NCH
3
2
–1.0
1.0
1
–1.5
0.5
1.5
2
2.5
3
3.5
4
4.5
5.5
5
–2.0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
0
–40
–20
VIN (V)
VIN (V)
40
20
60
0
TEMPERATURE (°C)
3459 G05
3459 G04
Shutdown Threshold Voltage
vs Temperature
80
3459 G06
Burst Cycle
Switch Pin Waveform
SHUTDOWN THRESHOLD VOLTAGE (V)
1.2
SW
CURRENT
50mA/DIV
1.0
SHDN RISING
0.8
SW
CURRENT
50mA/DIV
SHDN FALLING
0.6
0.4
0.2
0
–40
INDUCTOR
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
VIN = 3.3V
VOUT = 5V
L = 22µH
–20
40
20
60
0
TEMPERATURE (°C)
1µs/DIV
3459 G08
VIN = 3.3V
VOUT = 5V
L = 22µH
100ns/DIV
3459 G09
80
3459 G07
3459f
3
LTC3459
U W
TYPICAL PERFOR A CE CHARACTERISTICS
VOUT AC Ripple
Burst Cycle
VOUT
50mV/DIV
INDUCTOR
CURRENT
50mA/DIV
VIN = 3.3V
VOUT = 5V
L = 22µH
COUT = 4.7µF
CFF = 47pF
(TA = 25°C unless otherwise noted.)
5µs/DIV
Burst Cycle
SW
CURRENT
50mA/DIV
SW
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
VIN = 5V
VOUT = 10V
L = 22µH
3459 G10
VOUT Regulated Below VIN Burst
Cycle
1µs/DIV
Shorted Output
SW
CURRENT
50mA/DIV
1µs/DIV
3459 G13
3459 G12
VOUT
VOLTAGE
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
VIN = 5V
VOUT = 3.5V
L = 22µH
1µs/DIV
Start-Up
SW
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
VIN = 2V
VOUT = 10V
L = 22µH
3459 G11
INPUT
CURRENT
50mA/DIV
VIN = 5V
VOUT = 0V
L = 22µH
500ns/DIV
3459 G14
Load Steps
250µs/DIV
VIN = 3.6V
VOUT = 0V TO 8V
L = 22µH
CIN = 2.2µF
3459 G15
Load Steps
VOUT
AC RIPPLE
50mV/DIV
WITH 50kΩ
(TRACE 2
GROUNDED)
TO 500Ω
(TRACE 2 = 5V)
VOUT
AC RIPPLE
50mV/DIV
WITH 5kΩ
(TRACE 2
GROUNDED)
TO 500Ω
(TRACE 2 = 5V)
VIN = 3.6V
VOUT = 8V
L = 22µH
COUT = 4.7µF
CFF = 47pF
100µs/DIV
3459 G16
VIN = 3.6V
VOUT = 8V
L = 22µH
COUT = 4.7µF
CFF = 47pF
100µs/DIV
3459 G17
3459f
4
LTC3459
U
U
U
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect a 15µH to 33µH 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.
GND (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.
FB (Pin 3): Input to the Burst Mode Comparator. An
external resistor divider connected between VOUT, GND
and this pin sets the output voltage to:
SHDN (Pin 4): Master Shutdown Input. Driving SHDN low
disables all IC functions and reduces quiescent current
from the battery to less than 2µA. This pin must be pulled
above 1V to enable the IC.
VOUT (Pin 5): Regulated Output Voltage of the Boost
Regulator. Bypass VOUT with a low ESR, ESL ceramic
capacitor between 2.2µF and 10µF. VOUT ripple increases
with smaller capacitors.
VIN (Pin 6): Input Supply Pin. Bypass VIN with a low ESR,
ESL ceramic capacitor of at least 1µF.
VOUT = 1.22(1 + R1/R2)
3459f
5
LTC3459
W
BLOCK DIAGRA
1
SW
Q SD
IPEAK
IZO
QB R
Q
P/~N
IZERO
DETECT
VBEST SW1
S
VOUT
QB RD
VSELECT
IZO
S
6
+
VOUT
VSELECT
tOFF
tOFF
TIMER
VIN
–
VCC
THERMAL
SD
5
SLEEP
DELAY
P-DRIVE
Q
R1
RD QB
VBEST
FB
–
IPEAK
DETECT
3
R2
HYSTCOMP
+
VCC
VCC
N-DRIVE
N-DRIVE
SDB
REFOK
P-DRIVE
SD
REFERENCE
SD
SDB
GND
SHDN
2
4
3459 BD
OFF ON
3459f
6
LTC3459
U
OPERATIO
Operation
boost converter disconnects VOUT from VIN during shutdown to avoid loading the input power source.
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 (10µA) 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.
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).
IPEAK = ILIMIT + (100ns)
VIN
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
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
~50mVP-P
VOUT
AC
RIPPLE
IPEAK
tOFF
N
P
tOFF
N
P
BURST ON
~100mA
tOFF
N
P
N
P
N
IZERO WAIT
SLEEP
tOFF
P
N
BURST ON
3459 F01
Figure 1. Inductor Current and VOUT Ripple Waveforms
110
0.8
0.7
100
0.6
15µH
0.5
22µH
tOFF (µs)
IPEAK (mA)
90
80
33µH
0.4
0.3
70
0.2
60
50
1.5
0.1
2
2.5
3
4
3.5
VIN (V)
4.5
5
5.5
3459 F02
Figure 2. Typical IPEAK Values
0
0.5 1.5
2.5
3.5 4.5 5.5
VOUT – VIN (V)
6.5
7.5
8.5
3459 F03
Figure 3. tOFF Times
3459f
7
LTC3459
U
OPERATIO
overshoot. The tOFF timer is designed to maintain a relatively constant peak-to-peak current in the inductor despite VIN changes. This is accomplished by varying the tOFF
period by approximately 1/(VOUT – VIN). Due to propagation delays and a 0.6µA bias current in the timer, the tOFF
time can be more accurately predicted as follows:
tOFF ≈ 100ns +
0.8 pF • 1.25V
V
–V
0.6µA + OUT IN
500k
If VOUT is less than VIN, the tOFF delay is fixed at approximately 750ns.
U
W
U U
APPLICATIO S I FOR ATIO
Inductor Selection
An inductor with a minimum value of 15µH is recommended for use with the LTC3459. Values larger than
15µH 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 2.
Table 2. Example Inductors
VENDOR/PART
Chip Inductors
Murata
LQH31C
LQH32C-Low Profile
Taiyo Yuden
LB2016
Toko
LLB2520
Coilcraft
DO3314
DO1606T
Sumida
CMD4D06
CDRJ2D18LD
L DCR (Ω)/ DIMENSIONS
(mm)
(µH) IMAX (mA)
capacitor should also be an X5R type between 2.2µF and
10µF. A larger capacitor should be used if lower peak-topeak 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
CONTACT
INFORMATION
PCB Layout Guidlines
www.murata.com
22
22
3/160
0.7/250
3.2 × 1.6 × 1.8
3.2 × 2.5 × 1.6
15
22
33
0.7/130
1/105
1.7/85
2.0 × 1.6 × 1.6
www.t-yuden.com
(408) 573-4150
15
22
33
1.7/180
2.5/160
3.8/130
2.5 × 2.0 × 1.6
www.tokoam.com
(847) 297-0070
15 0.86/650 3.3 × 3.3 × 1.4
22 1.2/500
15 0.4/700 6.5 × 5.3 × 2.0
22 0.5/500
33 0.74/450
15 0.5/400 6.6 × 5.8 × 0.8
22 0.8/300
33 1.3/240
15 0.175/350 3.2 × 3.2 × 2.0
22 0.255/300
33 0.37/240
The high speed operation of the LTC3459 demands careful
attention to board layout. You will not get advertised
performance with careless layout. Figure 4 shows the
recommended component placement. A large ground pin
copper area will help to lower the chip temperature.
www.coilcraft.com
(847) 639-6400
VIN
www.sumida.com
(847) 956-0666
Capacitor Selection
The boost converter requires two capacitors. The input
capacitor should be an X5R type of at least 1.0µF. The VOUT
1
SW
VIN 6
2
GND VOUT 5
3
FB SHDN 4
SHDN
VOUT
3459 F04
RECOMMENDED COMPONENT PLACEMENT. TRACES
CARRYING CURRENT ARE DIRECT. TRACE AREA AT FB
PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT
Figure 4. Recommended Component
Placement for Single Layer Board
3459f
8
LTC3459
U
TYPICAL APPLICATIO S
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.
5V from Li-Ion Input
100
VOUT = 5V
15µH*
VIN = 4.2V
SW
VIN
2.5V TO 4.2V
Li-Ion
BATTERY
+
1M
LTC3459
1µF
SHDN
OFF ON
VOUT
5V
VOUT
VIN
47pF
4.7µF
FB
GND
EFFICIENCY (%)
90
VIN = 2.5V
80
70
332k
60
3459 TA04a
*COILCRAFT DO3314
50
0.01
0.1
1
ILOAD (mA)
10
100
3459 TA04b
10V from 3.3V or 5V Input
100
VOUT = 10V
33µH*
VIN
3.3V TO 5V
VIN
VOUT
2M
LTC3459
1µF
OFF ON
VOUT
10V
SHDN
GND
47pF
4.7µF
FB
EFFICIENCY (%)
90
SW
VIN = 5V
80
VIN = 3.3V
70
280k
60
3459 TA05a
*COILCRAFT DO3314
50
0.01
0.1
1
ILOAD (mA)
10
100
3459 TA05b
3459f
9
LTC3459
U
TYPICAL APPLICATIO S
Charging a SuperCap®
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
controlled, preventing any damaging effects of inrush
current. Proper heat sinking of the SOT 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.
SuperCaps have become a popular alternative to NiCd
batteries as backup 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.
SuperCap is a registered trademark of Baknor Industries.
L1
SW
VIN
1µF
3.3V
+
OFF ON
VOUT
5V
VOUT
1M
LTC3459
SHDN
GND
1µF
COUT
2F
FB
332k
3459 F05
COUT: MAXWELL TECHNOLOGIES ULTRACAP PC5-5, 2F, 5V
L1: 33µH, 1.7Ω TAIYO YUDEN LB2016
Figure 5. Charging a SuperCap from a 3.3V Source
3459f
10
LTC3459
U
PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
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
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
1.90 BSC
S6 TSOT-23 0302
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
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
3459f
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
U
TYPICAL APPLICATIO
3.3V from 2 AA Alkaline Input
100
L1
15µH
+
C1
2.2µF
+
OFF ON
VIN
VOUT
LTC3459
FB
SHDN
GND
R1
604k
C2
47pF
VOUT
3.3V
C3
4.7µF
R2
365k
3459 TA06a
C1: TDK C1608X5R1A225MT
C2: TDK C0603COG1E470J
C3: TDK C2012X5ROJ475K
L1: COILCRAFT DO3314-153MXB
R1: PANASONIC ERJ3EKF6043V
R2: PANASONIC ERJ3EKF3653V
VIN = 3V
EFFICIENCY (%)
2 AA
CELLS
90
SW
VIN
1.8V TO 3V
VOUT = 3.3V
80
VIN = 1.8V
70
60
50
0.01
0.1
1
ILOAD (mA)
10
100
3459 TA06b
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1310
1.5A ISW, 4.5MHz, High Efficiency Step-Up DC/DC Converter
VIN: 2.75V to 18V, VOUT(MAX) = 35V, IQ = 12mA, ISD < 1µA,
MS10E
LT1613
550mA ISW, 1.4MHz, High Efficiency Step-Up DC/DC Converter
VIN: 0.9V to 10V, VOUT(MAX) = 34V, IQ = 3mA, ISD < 1µA, ThinSOT
LT1615/LT1615-1
300mA/80mA ISW, Constant Off-Time, High Efficiency
Step-Up DC/DC Converter
VIN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD < 1µA,
ThinSOT
LT1618
1.5A ISW, 1.4MHz, High Efficiency Step-Up DC/DC Converter
VIN: 1.6V to 18V, VOUT(MAX) = 35V, IQ = 1.8mA, ISD < 1µA, MS10
LT1944 (Dual)
Dual Output 350mA ISW, Constant Off-Time, High Efficiency
Step-Up DC/DC Converter
VIN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD < 1µA, MS10
LT1945 (Dual)
Dual Output Pos/Neg 350mA ISW, Constant Off-Time,
High Efficiency Step-Up DC/DC Converter
VIN: 1.2V to 15V, VOUT(MAX) = ±34V, IQ = 20µA, ISD < 1µA, MS10
LT1946/LT1946A
1.5A ISW, 1.2MHz/2.7MHZ, High Efficiency Step-Up
DC/DC Converter
VIN: 2.45V to 16V, VOUT(MAX) = 34V, IQ = 3.2mA, ISD < 1µA, MS8
LT1949/LT1949-1
550mA ISW, 600kHz/1.1MHz, High Efficiency Step-Up
DC/DC Converter
VIN: 1.5V to 12V, VOUT(MAX) = 28V, IQ = 4.5mA, ISD < 25µA, SO-8,
MS8
LT1961
1.5A ISW, 1.25MHz, High Efficiency Step-Up DC/DC Converter
VIN: 3V to 25V, VOUT(MAX) = 35V, IQ = 0.9mA, ISD < 6µA, MS8E
LTC3400/LTC3400B 600mA ISW, 1.2MHz, Synchronous Step-Up DC/DC Converter
VIN: 0.5V to 5V, VOUT(MAX) = 5V, IQ = 19µA/300µA ISD < 1µA,
ThinSOT
LTC3401
1A ISW, 3MHz, Synchronous Step-Up DC/DC Converter
VIN: 0.5V to 5V, VOUT(MAX) = 6V, IQ = 38µA ISD < 1µA, MS10
LTC3402
2A ISW, 3MHz, Synchronous Step-Up DC/DC Converter
VIN: 0.5V to 5V, VOUT(MAX) = 6V, IQ = 38µA ISD < 1µA, MS10
LTC3425
5A ISW, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter
QFN32
VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 12µA, ISD < 1µA,
LTC3429
600mA, 500kHz, Synchronous Step-Up DC/DC Converter
with Output Disconnect and Soft-Start
VIN: 0.5V to 5V, VOUT(MAX) = 5V, IQ = 20µA/300µA ISD < 1µA,
ThinSOT
LT3460
320mA ISW, 1.3MHz, High Efficiency Step-Up DC/DC Converter
VIN: 2.5V to 16V, VOUT(MAX) = 36V, IQ = 2mA, ISD < 1µA, SC70,
ThinSOT
LT3464
85mA ISW, Constant Off-Time, High Efficiency Step-Up DC/DC
Converter with Integrated Schottky/Output Disconnect
VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25µA, ISD < 1µA,
ThinSOT
3459f
12
Linear Technology Corporation
LT/TP 0304 1K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2004
Similar pages