LTC3459ES6#TRPBF [Linear]
LTC3459 - 10V Micropower Synchronous Boost Converter in ThinSOT; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C;
| 型号： | LTC3459ES6#TRPBF |
| 厂家： | 
Linear |
| 描述： | LTC3459 - 10V Micropower Synchronous Boost Converter in ThinSOT; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C 转换器 稳压器 开关式稳压器或控制器 电源电路 开关式控制器 光电二极管 升压转换器 |
| 文件： | 总12页 (文件大小：218K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3459
10V Micropower
Synchronous Boost Converter
in ThinSOT
U
FEATURES
DESCRIPTIO
TheLTC®3459isalowcurrent,highefficiencysynchronous
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
anexternaldividerbetween2.5Vand10V.Althoughthepart
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
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.
■
Digital Cameras
■
PDAs
LCD Bias
Small OLED Displays
Supercap Charging
■
■
■
U
TYPICAL APPLICATIO
Efficiency
5V to 8V Converter
100
V
V
= 5V
IN
OUT
22µH
= 8V
90
80
70
60
50
SW
V
OUT
8V
5V
V
IN
V
OUT
30mA
2M
47pF
LTC3459
OFF ON
SHDN
GND
FB
1µF
4.7µF
365k
3459 TA01a
0.01
0.1
1
10
100
I
(mA)
LOAD
3459 TA01b
3459f
1
LTC3459
W W U W
U W
U
ABSOLUTE AXI U RATI GS
Referred to GND (Note 1)
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
VIN, FB Voltage ........................................... –0.3V to 7V
VOUT, SHDN Voltage ................................. –0.3V to 10V
SW Voltage ............................................... –0.3V to 12V
Operating Temperature Range
TOP VIEW
SW 1
GND 2
FB 3
6 V
5 V
IN
OUT
LTC3459ES6
4 SHDN
(Notes 2, 3) ........................................ –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
S6 PACKAGE
S6 PART MARKING
LTAHA
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 165°C/W, θJC = 102°C/W
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
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Input Voltage Range
●
●
1.5
5.5
20
1
V
µA
µA
V
V
V
Quiescent Current
Shutdown Current
SHDN = V
10
IN
IN
CC
SHDN = GND
0.1
OUT
Programmable Voltage Range
2.5
10
4
V
µA
µA
V
V
Quiescent Supply Current
Shutdown Current
SHDN = V
2
OUT
OUT
CC
SHDN = GND
0.1
1
Reference
Feedback Voltage
V
= 3.3V, V
= 7.5V
OUT
●
●
1.19
1.22
10
1.25
50
V
IN
FB Input Leakage Current
Converter Performance
Measured on FB
nA
Peak Switch Current (V = 3.3V)
L = 22µH
60
75
400
0
90
mA
ns
IN
t
Timer (V = 3.3V, V
= 5V)
Varies by 1/(V
– V )
225
550
OFF
IN
OUT
OUT
IN
Zero Current Comparator Threshold
Main NMOS Switch
On Resistance
L = 22µH
mA
V
V
= 5V
2.8
Ω
OUT
Leakage Current
= 10V, V
= 10V
OUT
0.01
1
µA
SWITCH
Main PMOS Switch
On Resistance
V
V
= 5V
4.2
Ω
OUT
IN
Leakage Current
= 5V, V
= 5V, V
= 0V
OUT
0.02
2
1
µA
SWITCH
Logic Inputs
SHDN Threshold (Rising Edge)
SHDN Hysteresis
0.3
V
mV
nA
80
0
SHDN Input Leakage Current
50
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.
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 (T = 25°C unless otherwise noted.)
A
VIN and VOUT Quiescent Current
vs Temperature
Minimum ROUT vs VIN
Minimum POUT vs VIN
4000
400
350
300
250
200
150
100
50
16
V
V
V
V
= 10V
= 7.5V
= 5V
V
OUT
V
OUT
V
OUT
V
OUT
= 10V
= 7.5V
= 5V
V
V
= 3.3V
= 5V
OUT
OUT
OUT
OUT
IN
OUT
3500
3000
14
12
= 3.3V
= 3.3V
L = 22µH
L = 22µH
I
IN
2500
2000
1500
1000
500
10
8
6
4
I
OUT
2
0
0
0
2
2.5
3.5
(V)
4
4.5
5
5.5
1.5
3
3.5
(V)
4.5
5
5.5
1.5
2
2.5
3
4
–20
0
40
60
80
–40
20
V
V
TEMPERATURE (°C)
IN
IN
3459 G01
3459 G02
3459 G03
Switching Frequency
vs VIN at Various VOUTS
N-Channel and P-Channel
MOSFET RDS(ON) vs Temperature
VOUT Regulation vs VIN and COUT
3.0
2.5
2.0
1.5
1.0
0.5
2.0
1.5
6
5
4
3
V
V
V
V
= 10V
= 7.5V
= 5V
4.7µF
10µF
22µF
47µF
V
OUT
= 5V
OUT
OUT
OUT
OUT
= 3.3V
1.0
PCH
L = 22µH
V
= 5V
OUT
L = 22µH
0.5
NCH
0
–0.5
–1.0
–1.5
–2.0
2
1
0
3.5
(V)
4
1.5
2
2.5
3
4.5
5
5.5
3.5
(V)
1.5
2
2.5
3
4
4.5
5
5.5
40
TEMPERATURE (°C)
80
–40 –20
0
20
60
V
V
IN
IN
3459 G05
3459 G04
3459 G06
Shutdown Threshold Voltage
vs Temperature
Burst Cycle
Switch Pin Waveform
1.2
1.0
0.8
0.6
SW
CURRENT
50mA/DIV
SHDN RISING
SHDN FALLING
SW
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
0.4
0.2
0
3459 G09
3459 G08
V
V
= 3.3V
= 5V
100ns/DIV
V
V
= 3.3V
= 5V
1µs/DIV
IN
OUT
L = 22µH
IN
OUT
L = 22µH
40
TEMPERATURE (°C)
80
–40 –20
0
20
60
3459 G07
3459f
3
LTC3459
U W
TYPICAL PERFOR A CE CHARACTERISTICS (T = 25°C unless otherwise noted.)
A
VOUT AC Ripple
Burst Cycle
Burst Cycle
V
OUT
50mV/DIV
SW
CURRENT
50mA/DIV
SW
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
3459 G11
3459 G12
3459 G10
V
V
= 5V
1µs/DIV
V
V
= 2V
1µs/DIV
V
= 3.3V
= 5V
5µs/DIV
IN
OUT
IN
OUT
IN
= 10V
= 10V
V
OUT
L = 22µH
L = 22µH
L = 22µH
C
C
= 4.7µF
= 47pF
OUT
FF
VOUT Regulated Below VIN Burst
Cycle
Shorted Output
Start-Up
V
OUT
VOLTAGE
50mA/DIV
SW
CURRENT
50mA/DIV
SW
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
INPUT
CURRENT
50mA/DIV
3459 G15
3459 G14
3459 G13
V
V
= 3.6V
250µs/DIV
V
V
= 5V
500ns/DIV
V
V
= 5V
1µs/DIV
IN
OUT
IN
OUT
IN
OUT
= 0V TO 8V
= 0V
= 3.5V
L = 22µH
= 2.2µF
L = 22µH
L = 22µH
C
IN
Load Steps
Load Steps
V
V
OUT
OUT
AC RIPPLE
50mV/DIV
WITH 50kΩ
(TRACE 2
AC RIPPLE
50mV/DIV
WITH 5kΩ
(TRACE 2
GROUNDED)
TO 500Ω
(TRACE 2 = 5V)
GROUNDED)
TO 500Ω
(TRACE 2 = 5V)
3459 G16
3459 G17
V
V
= 3.6V
OUT
L = 22µH
100µs/DIV
V
V
= 3.6V
OUT
L = 22µH
100µs/DIV
IN
IN
= 8V
= 8V
C
C
= 4.7µF
C
C
= 4.7µF
OUT
OUT
= 47pF
= 47pF
FF
FF
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.
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.
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
.
VIN (Pin 6): Input Supply Pin. Bypass VIN with a low ESR,
ESL ceramic capacitor of at least 1µF.
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:
VOUT = 1.22(1 + R1/R2)
3459f
5
LTC3459
W
BLOCK DIAGRA
1
SW
V
CC
V
–
+
IN
6
V
SELECT
t
OFF
t
OFF
TIMER
V
OUT
I
PEAK
Q
SD
R
SW1
I
ZO
V
BEST
QB
I
ZERO
DETECT
Q
S
P/~N
V
OUT
QB RD
5
THERMAL
SD
SLEEP
DELAY
V
SELECT
P-DRIVE
I
S
Q
ZO
R1
R2
RD QB
V
CC
FB
–
+
V
BEST
3
I
PEAK
DETECT
HYSTCOMP
V
N-DRIVE
CC
N-DRIVE
SDB
REFOK
REFERENCE
P-DRIVE
SD
SD
SDB
GND
SHDN
2
4
3459 BD
OFF ON
3459f
6
LTC3459
U
OPERATIO
Operation
boost converter disconnects VOUT from VIN during shut-
down to avoid loading the input power source.
TheLTC3459synchronousboostconverterutilizesaBurst
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 qui-
escent current (10µA) is drawn from the power source.
WhenVOUTdropsbelowthecomparatorthreshold,switch-
ing commences and the output capacitor is charged. Dur-
ing 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).
V
L
IN
I
PEAK =ILIMIT + 100ns
(
)
tOFF Timer
The LTC3459’s tOFF timer is designed to keep the inductor
currentcontinuousduringaBurstModeswitchingpacket,
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
arerequiredtocompletethedesignoftheboostconverter,
an external Schottky diode is not required. The high
operating frequency allows the use of low value, low
profileinductorsandtinyexternalceramiccapacitors. The
~50mV
P-P
V
OUT
AC
RIPPLE
I
PEAK
~100mA
t
t
t
t
OFF
P
OFF
P
OFF
P
OFF
N
N
N
N
P
N
P
N
BURST ON
I
WAIT
SLEEP
BURST ON
ZERO
3459 F01
Figure 1. Inductor Current and VOUT Ripple Waveforms
110
100
90
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
15µH
22µH
80
33µH
70
60
50
1.5
4
4.5
2
2.5
3
3.5
(V)
5
5.5
0.5
4.5
6.5 7.5
1.5 2.5 3.5
5.5
8.5
3459 F02
V
IN
3459 F03
V
OUT
– V (V)
IN
Figure 2. Typical IPEAK Values
Figure 3. tOFF Times
3459f
7
LTC3459
U
OPERATIO
overshoot. The tOFF timer is designed to maintain a rela-
tively constant peak-to-peak current in the inductor de-
spiteVIN changes.ThisisaccomplishedbyvaryingthetOFF
period by approximately 1/(VOUT – VIN). Due to propaga-
tion delays and a 0.6µA bias current in the timer, the tOFF
time can be more accurately predicted as follows:
0.8pF •1.25V
VOUT – V
tOFF ≈ 100ns +
IN
0.6µA +
500k
If VOUT is less than VIN, the tOFF delay is fixed at approxi-
mately 750ns.
W U U
U
APPLICATIO S I FOR ATIO
Inductor Selection
capacitor should also be an X5R type between 2.2µF and
10µF. A larger capacitor should be used if lower peak-to-
peak output ripple and better line regulation is desired.
An inductor with a minimum value of 15µH is recom-
mended 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. Capacitor Vendor Information
SUPPLIER
PHONE
WEBSITE
AVX
(803) 448-9411
(714) 852-2001
(408) 573-4150
(847) 803-6100
www.avxcorp.com
www.murata.com
www.t-yuden.com
www.component.tdk.com
Murata
Taiyo Yuden
TDK
Table 2. Example Inductors
L
DCR (Ω)/ DIMENSIONS
MAX
CONTACT
VENDOR/PART
Chip Inductors
(µH) I
(mA)
(mm)
INFORMATION
PCB Layout Guidlines
Murata
LQH31C
www.murata.com
ThehighspeedoperationoftheLTC3459demandscareful
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.
22
3/160
3.2 × 1.6 × 1.8
LQH32C-Low Profile 22 0.7/250 3.2 × 2.5 × 1.6
Taiyo Yuden
LB2016
www.t-yuden.com
15 0.7/130 2.0 × 1.6 × 1.6 (408) 573-4150
22
33
1/105
1.7/85
Toko
LLB2520
www.tokoam.com
15 1.7/180 2.5 × 2.0 × 1.6 (847) 297-0070
22 2.5/160
33 3.8/130
Coilcraft
DO3314
www.coilcraft.com
15 0.86/650 3.3 × 3.3 × 1.4 (847) 639-6400
22 1.2/500
1
2
3
SW
V
6
5
4
IN
V
IN
DO1606T
15 0.4/700 6.5 × 5.3 × 2.0
22 0.5/500
GND V
OUT
33 0.74/450
FB SHDN
SHDN
Sumida
www.sumida.com
15 0.5/400 6.6 × 5.8 × 0.8 (847) 956-0666
22 0.8/300
CMD4D06
33 1.3/240
V
OUT
CDRJ2D18LD
15 0.175/350 3.2 × 3.2 × 2.0
22 0.255/300
33 0.37/240
3459 F04
RECOMMENDED COMPONENT PLACEMENT. TRACES
CARRYING CURRENT ARE DIRECT. TRACE AREA AT FB
PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT
Capacitor Selection
Figure 4. Recommended Component
Placement for Single Layer Board
The boost converter requires two capacitors. The input
capacitorshouldbeanX5Rtypeofatleast1.0µF.TheVOUT
3459f
8
LTC3459
U
TYPICAL APPLICATIO S
Very low operating quiescent current and synchronous
operation allow for greater than 85% conversion effi-
ciency in many applications. Lower output voltages will
result in lower efficiencies since the N- and P-channel
R
DS(ON)’s will increase. The switching frequency and
output power capability of the LTC3459 are also depen-
dant on input and output voltages.
5V from Li-Ion Input
100
90
80
70
60
50
V
= 5V
OUT
15µH*
V
= 4.2V
= 2.5V
IN
SW
V
V
OUT
IN
V
IN
V
OUT
V
IN
5V
2.5V TO 4.2V
47pF
1M
LTC3459
+
Li-Ion
BATTERY
1µF
4.7µF
OFF ON
SHDN
GND
FB
332k
3459 TA04a
*COILCRAFT DO3314
0.01
0.1
1
10
100
I
(mA)
LOAD
3459 TA04b
10V from 3.3V or 5V Input
100
V
OUT
= 10V
33µH*
90
80
70
60
50
V
= 5V
IN
SW
V
V
OUT
IN
V
V
OUT
IN
3.3V TO 5V
10V
47pF
2M
V
IN
= 3.3V
LTC3459
4.7µF
1µF
OFF ON
SHDN
GND
FB
280k
3459 TA05a
*COILCRAFT DO3314
0.01
0.1
1
10
100
I
(mA)
LOAD
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 re-
quired 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 synchro-
nous switch. Average input current is a constant 50mA
during charging, where the current delivered to the
SuperCap varies somewhat with duty cycle. Once the
supercapischargedto5V, theLTC3459beginstoregulate
and the input current is reduced to the amount required to
support the load and/or self discharge of the SuperCap.
SuperCap is a registered trademark of Baknor Industries.
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 cur-
rents 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 applica-
tion, 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.
L1
SW
V
OUT
V
V
OUT
IN
LTC3459
SHDN
GND
5V
1µF
1M
1µF
+
3.3V
C
OUT
2F
OFF ON
FB
332k
3459 F05
C
: MAXWELL TECHNOLOGIES ULTRACAP PC5-5, 2F, 5V
OUT
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)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.4 MIN
1.50 – 1.75
2.80 BSC
3.85 MAX 2.62 REF
(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
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LTC3459
U
TYPICAL APPLICATIO
3.3V from 2 AA Alkaline Input
100
L1
15µH
V
= 3.3V
OUT
90
80
70
60
50
SW
V
= 3V
IN
V
V
OUT
3.3V
IN
V
V
OUT
IN
1.8V TO 3V
C1
C2
R1
V
= 1.8V
+
+
IN
2.2µF
LTC3459
SHDN
GND
47pF
604k
2 AA
CELLS
C3
4.7µF
OFF ON
FB
R2
365k
3459 TA06a
C1: TDK C1608X5R1A225MT
C2: TDK C0603COG1E470J
C3: TDK C2012X5ROJ475K
L1: COILCRAFT DO3314-153MXB
R1: PANASONIC ERJ3EKF6043V
R2: PANASONIC ERJ3EKF3653V
0.01
0.1
1
10
100
I
(mA)
LOAD
3459 TA06b
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1310
1.5A I , 4.5MHz, High Efficiency Step-Up DC/DC Converter
V : 2.75V to 18V, V
MS10E
= 35V, I = 12mA, I < 1µA,
OUT(MAX) Q SD
SW
IN
LT1613
550mA I , 1.4MHz, High Efficiency Step-Up DC/DC Converter
V : 0.9V to 10V, V
= 34V, I = 3mA, I < 1µA, ThinSOT
OUT(MAX) Q SD
= 34V, I = 20µA, I < 1µA,
OUT(MAX) Q SD
SW
IN
LT1615/LT1615-1
300mA/80mA I , Constant Off-Time, High Efficiency
V : 1.2V to 15V, V
IN
SW
Step-Up DC/DC Converter
ThinSOT
LT1618
1.5A I , 1.4MHz, High Efficiency Step-Up DC/DC Converter
V : 1.6V to 18V, V
= 35V, I = 1.8mA, I < 1µA, MS10
OUT(MAX) Q SD
= 34V, I = 20µA, I < 1µA, MS10
OUT(MAX) Q SD
SW
IN
LT1944 (Dual)
Dual Output 350mA I , Constant Off-Time, High Efficiency
V : 1.2V to 15V, V
IN
SW
Step-Up DC/DC Converter
LT1945 (Dual)
LT1946/LT1946A
LT1949/LT1949-1
LT1961
Dual Output Pos/Neg 350mA I , Constant Off-Time,
High Efficiency Step-Up DC/DC Converter
V : 1.2V to 15V, V
= ±34V, I = 20µA, I < 1µA, MS10
SW
IN
OUT(MAX) Q SD
1.5A I , 1.2MHz/2.7MHZ, High Efficiency Step-Up
V : 2.45V to 16V, V
IN
= 34V, I = 3.2mA, I < 1µA, MS8
OUT(MAX) Q SD
SW
DC/DC Converter
550mA I , 600kHz/1.1MHz, High Efficiency Step-Up
V : 1.5V to 12V, V
= 28V, I = 4.5mA, I < 25µA, SO-8,
SW
IN
OUT(MAX) Q SD
DC/DC Converter
MS8
1.5A I , 1.25MHz, High Efficiency Step-Up DC/DC Converter
V : 3V to 25V, V
= 35V, I = 0.9mA, I < 6µA, MS8E
SW
IN
OUT(MAX) Q SD
LTC3400/LTC3400B 600mA I , 1.2MHz, Synchronous Step-Up DC/DC Converter
V : 0.5V to 5V, V
ThinSOT
= 5V, I = 19µA/300µA I < 1µA,
OUT(MAX) Q SD
SW
IN
LTC3401
LTC3402
LTC3425
1A I , 3MHz, Synchronous Step-Up DC/DC Converter
V : 0.5V to 5V, V
= 6V, I = 38µA I < 1µA, MS10
Q SD
SW
IN
OUT(MAX)
= 6V, I = 38µA I < 1µA, MS10
OUT(MAX) Q SD
2A I , 3MHz, Synchronous Step-Up DC/DC Converter
V : 0.5V to 5V, V
IN
SW
5A I , 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter V : 0.5V to 4.5V, V
= 5.25V, I = 12µA, I < 1µA,
Q SD
SW
IN
OUT(MAX)
QFN32
LTC3429
LT3460
LT3464
600mA, 500kHz, Synchronous Step-Up DC/DC Converter
with Output Disconnect and Soft-Start
V : 0.5V to 5V, V
ThinSOT
= 5V, I = 20µA/300µA I < 1µA,
OUT(MAX) Q SD
IN
320mA I , 1.3MHz, High Efficiency Step-Up DC/DC Converter
V : 2.5V to 16V, V
= 36V, I = 2mA, I < 1µA, SC70,
Q SD
SW
IN
OUT(MAX)
OUT(MAX)
ThinSOT
85mA I , Constant Off-Time, High Efficiency Step-Up DC/DC
V : 2.3V to 10V, V
= 34V, I = 25µA, I < 1µA,
Q SD
SW
IN
Converter with Integrated Schottky/Output Disconnect
ThinSOT
3459f
LT/TP 0304 1K • PRINTED IN USA
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2004
相关型号：
LTC3490ES8#PBF
LTC3490 - Single Cell 350mA LED Driver; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C
Linear
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