LTC1574CS-3.3#TRPBF [Linear]
LTC1574 - High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C;
| 型号： | LTC1574CS-3.3#TRPBF |
| 厂家： | 
Linear |
| 描述： | LTC1574 - High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode; Package: SO; Pins: 16; Temperature Range: 0°C to 70°C 转换器 稳压器 开关式稳压器或控制器 电源电路 肖特基二极管 开关式控制器 光电二极管 |
| 文件： | 总8页 (文件大小：178K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1574
LTC1574-3.3/LTC1574-5
High Efficiency Step-Down
DC/DC Converters
with Internal Schottky Diode
U
FEATURES
DESCRIPTIO
The LTC®1574 is a family of easy-to-use current mode
DC/DC converters ideally suited for 9V to 5V, 5V to 3.3V
and inverting operation. With an internal 0.9Ω switch (at
a supply voltage of 12V) and a low forward drop Schottky
diode (0.450V typ at 200mA, TA = 25°C), the LTC1574
requires only three external components to construct a
complete high efficiency DC/DC converter.
■
High Efficiency: Up to 94%
■
Usable in Noise-Sensitive Products
■
Peak Inductor Current Independent of Inductor Value
■
Short-Circuit Protection
■
Internal Low Forward Drop Schottky Diode
■
Only Three External Components Required
■
Wide VIN Range: 4V to 18.5V (Absolute Maximum)
■
Low Dropout Operation
Low-Battery Detector
Pin Selectable Current Limit
Under no load condition, the LTC1574 draws only 130µA.
In shutdown, it draws a mere 2µA making this converter
ideal for battery-powered applications. In dropout, the
internal P-channel MOSFET switch is turned on continu-
ously allowing the user to maximize the life of the battery
source.
■
■
■
Internal 0.9Ω Power Switch: VIN < 11V
■
Standby Current: 130µA
■
Active Low Micropower Shutdown
U
The maximum inductor current of the LTC1574 family is
pin selectable to either 340mA or 600mA, optimizing
efficiency for a wide range of applications. Operation up to
200kHz permits the use of small surface mount inductors
and capacitors.
APPLICATIO S
■
Inverting Converters
■
Step-Down Converters
■
Memory Backup Supply
Portable Instruments
Battery-Powered Equipment
Distributed Power Systems
■
For applications requiring higher output current or ultra-
high efficiency, see the LTC1148 or LTC1265 data sheets.
For detailed applications information, see the LTC1174
data sheet.
■
■
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATIO
LTC1574-5 Efficiency
High Efficiency Step-Down Converter
100
L = 100µH
V
V
= 5V
= 0V
IN
OUT
PGM
95
90
85
80
75
70
V
= 6V
= 9V
5.5V to
IN
I
16V
+
5
22µF*
V
35V
IN
V
12
11
6
IN
7
LB
LB
SHDN
IN
LTC1574-5
10
V
OUT
OUT
†
100µH
5V
175mA
3, 14
I
SW
PGM
+
100µF*
10V
GND
2, 4, 13, 15
1574 TA01
1
10
LOAD CURRENT (mA)
100 200
* AVX TPSD226K035
** AVX TPSD107K010
†
COILTRONICS CTX100-4
1574 TA02
1
LTC1574
LTC1574-3.3/LTC1574-5
W W
U W
U W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
ORDER PART
NUMBER
(Voltage Referred to GND Pin)
NC
GND
SW
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
Input Supply Voltage (Pin 5) ................. –0.3V to 18.5V
Switch Current (Pin 3, 14) ........................................ 1A
Switch Voltage (Pin 3, 14) .......................... VIN – 18.5V
Operating Temperature Range .................... 0°C to 70°C
Junction Temperature (Note 2)............................ 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
GND
SW
LTC1574CS
LTC1574CS-3.3
LTC1574CS-5
GND
GND
V
LB
IN
IN
I
LB
PGM
OUT
SHDN
V
(V *)
OUT FB
NC
NC
S PACKAGE
16-LEAD PLASTIC SO
*ADJUSTABLE OUTPUT VERSION
= 125°C, θ = 110°C/W
T
JMAX
JA
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 9V, SHDN = VIN, IPGM = 0V, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
LTC1574
MIN
TYP
MAX UNITS
I
Feedback Current into Pin 10
Feedback Voltage
1
µA
FB
V
V
LTC1574
●
1.20
1.25
1.30
V
FB
Regulated Output Voltage
LTC1574-3.3
LTC1574-5
●
●
3.14
4.75
3.30
5.00
3.46
5.25
V
V
OUT
∆V
OUT
Output Voltage Line
Regulation
V
= 6V to 12V, I
= 100mA, I
= V (Note 3)
10
70
mV
IN
LOAD
PGM
IN
Output Voltage Load
Regulation
LTC1574-3.3 (Note 3) 20mA < I
20mA < I
< 175mA, I
< 400mA, I
= 0V
–5
–45
–70
–70
mV
mV
LOAD
LOAD
PGM
PGM
= V
IN
LTC1574-5 (Note 3)
20mA < I
20mA < I
< 175mA, I
< 400mA, I
= 0V
–5
–50
–70
–70
mV
mV
LOAD
LOAD
PGM
PGM
= V
IN
I
Input DC Supply Current (Note 4)
Active Mode
Q
4V < V < 16V, I
= 0V
PGM
450
130
2
600
180
25
µA
µA
µA
IN
Sleep Mode
Shutdown (Note 5)
4V < V < 16V
IN
SHDN = 0V, 4V < V < 16V
IN
V
Low-Battery Trip Point
Current into Pin 12
1.25
1.4
0.5
V
LBTRIP
I
I
µA
LBIN
Current Sunk by Pin 11
V
V
= 0.4V, V = 0V
LBIN
0.5
7.5
1.0
15
1.5
1.0
mA
µA
LBOUT
LBOUT
LBOUT
= 5V, V
= 10V
LBIN
V
Comparator Hysteresis
Current Limit
30
mV
HYST
I
I
I
= V , V
= 0V
= 0V
●
●
0.54
0.27
0.60
0.34
0.83
0.53
A
A
PEAK
PGM
PGM
IN OUT
= 0V, V
OUT
R
ON Resistance of Switch
Switch Off Time
●
0.9
4
1.55
5
Ω
µs
V
ON
t
V
at Regulated Value
OUT
3
OFF
V
V
SHDN Pin High
Minimum Voltage at Pin 7 for Device to Be Active
Maximum Voltage at Pin 7 for Device to Be in Shutdown
1.2
IH
IL
SHDN Pin Low
0.75
V
2
LTC1574
LTC1574-3.3/LTC1574-5
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 9V, SHDN = VIN, IPGM = 0V, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
I
I
SHDN Pin Input Current
SHDN = 16V
2
µA
µA
V
IH
IL
SHDN Pin Input Current
0 ≤ SHDN ≤ 0.8V
Forward Current = 200mA
0.5
V
Schottky Diode Forward Voltage
Schottky Reverse Current
0.450 0.570
F
I
Reverse Voltage = 5V
Reverse Voltage = 18.5V
10
100
25
250
µA
µA
R
Note 3: Guaranteed by design.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 4: Does not include Schottky reverse current. Dynamic supply
current is higher due to the gate charge being delivered at the switching
frequency.
Note 2: T is calculated from the ambient temperature T and power
J
A
dissipation P according to the following formulas:
D
Note 5: Current into Pin 5 only, measured without electrolytic input
T = T + (P • 110°C/W)
J
A
D
capacitor.
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
Efficiency vs Load Current
Efficiency vs Input Voltage
100
95
90
85
80
75
70
95
94
93
92
91
90
89
100
90
80
70
60
50
V
= 5V
OUT
L = 100µH
V
= 5V
IN
COIL = CTX100-4
V
= 6V
IN
V
= 9V
IN
V
= 9V
IN
I
I
= 100mA
LOAD
= 0V
PGM
I
= 300mA
LOAD
I
= V
PGM
IN
L = 50µH
L = 50µH
V
I
= 5V
V
I
= 3.3V
OUT
PGM
OUT
PGM
= V
= V
IN
IN
COIL = CTX50-4
COIL = CTX50-4
1
10
100 400
1
10
100
500
12
5
6
7
8
9
10 11
13 14
LOAD CURRENT (mA)
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
1574 • TPC02
1574 • TPC01
1574 • TPC03
Efficiency Using Different Types
of Inductor Core Material
Switch Leakage Current
vs Temperature
Switch Resistance vs
Input Voltage
180
160
140
120
100
80
100
90
80
70
60
50
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
V
IN
= 13.5V
T
= 25°C
A
CTX50-4
CTX50-4P
60
40
V
V
PGM
= 5V
IN
= 3.3V
IN
OUT
20
I
= V
0
0
20
40
60
80
100
1
10
100
500
4
6
10 12 14 16 18 20
INPUT VOLTAGE (V)
1574 • TPC06
8
TEMPERATURE (°C)
LOAD CURRENT (mA)
1574 • TPC04
1574 • TPC05
3
LTC1574
LTC1574-3.3/LTC1574-5
U
U
U
PI FU CTIO S
VOUT or VFB (Pin 10): For the LTC1574, this pin connects
o the main voltage comparator input. On the LTC1574-5
and LTC1574-3.3, this pin goes to an internal resistive
divider which sets the output voltage
NC (Pins 1, 8, 9, 16): No Connection.
t
GND (Pins 2, 4, 13, 15): Ground.
SW (Pins 3, 14): Drain of P-Channel MOSFET Switch and
Cathode of Schottky Diode.
.
LBOUT (Pin 11): Open drain of an N-Channel Pull-Down.
This pin will sink current when (Pin 12) LBIN goes below
1.25V.
V
IN (Pin 5): Input Supply Voltage. It must be decoupled
close to ground (Pin 4).
IPGM (Pin 6): This pin selects the current limit of the
P-channel switch. With IPGM = VIN, the current trip point is
600mA and with IPGM = 0V, the current trip point is
reduced to 340mA.
LBIN (Pin 12): The (–) Input of the Low-Battery Voltage
Comparator. The (+) input is connected to a reference
voltage of 1.25V.
SHDN (Pin 7): Pulling this pin to ground keeps the internal
switch off and puts the LTC1574 in micropower shutdown.
W U U
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APPLICATIO S I FOR ATIO
Operating Frequency and Inductor
IPGM pin, the limit is either set to 340mA or 600mA. In
addition, the off-time of the switch is increased to allow the
inductor current to decay far enough to prevent any current
build-up (see Figure 1).
Since the LTC1574 utilizes a constant off-time architecture,
itsoperatingfrequencyisdependentonthevalueofVIN.The
frequency of operation can be expressed as:
V − VOUT
V + VD
IN
1
tOFF
IN
f =
Hz
( )
IPGM = VIN
where tOFF = 4µs and VD is the voltage drop across the
internal Schottky diode. Note that the operating frequency
is a function of the input and output voltage.
IPGM = 0
Although the size of the inductor does not affect the fre-
quency or inductor peak current, it does affect the ripple
current. The peak-to-peak ripple current is given by:
GND
V
OUT + VD
RIPPLE = 4 •10−6
AP-P
1574 • F01
I
L = 100µH
IN = 13.5V
20µs/DIV
(
)
V
L
Figure 1. Inductor Current with Output Shorted
Whenchoosingasmallinductor, corelosswillincreasedue
to higher ripple current. Therefore, a low ESR output
capacitor has to be used.
Low-Battery Detector
Thelow-batteryindicatorsensestheinputvoltagethrough
anexternalresistivedivider. Thisdividedvoltageconnects
to the “–” input of a voltage comparator (Pin 12) which is
comparedwitha1.25Vreferencevoltage. Withthecurrent
Short-Circuit Protection
The LTC1574 is protected from output short circuits by its
internal current limit. Depending on the condition of the
4
LTC1574
LTC1574-3.3/LTC1574-5
W U U
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APPLICATIO S I FOR ATIO
going into Pin 12 being negligible, the following expres-
sion is used for setting the trip limit:
differencebetweentheabsolutemaximumvoltagerating
and the output voltage. A maximum of 12V is specified in
Figure4,givingthecircuit1.5VofheadroomforVIN.Note
that the circuit can operate from a minimum of 4V,
making it ideal for a four NiCd cell application. For a
higher output current circuit, please refer to the Typical
Applications section.
R4
R3
VLBTRIP = 1.25 1+
V
IN
LTC1574
R4
R3
INPUT VOLTAGE
4V TO 12V
12
–
+
5
1.25V
REFERENCE
+
47µF*
V
IN
0.1µF
16V
LTC1574-5
SHDN
× 2
1574 • F02
12
11
6
7
LB
LB
IN
Figure 2. Low-Battery Comparator
10
V
OUT
OUT
SW
50µH**
3, 14
LTC1574 Adjustable Applications
I
PGM
+
47µF*
16V
× 2
GND
2, 4, 13, 15
The LTC1574 develops a 1.25V reference voltage between
the feedback terminal (Pin 10) and ground (see Figure 3).
By selecting resistor R1, a constant current is caused to
flow through R1 and R2 to set the overall output voltage.
The regulated output voltage is determined by:
V
OUT
–5V
45mA
AVX TPSD476K016
COILTRONICS CTX50-4
*
**
1574 • F04
Figure 4. Positive-to-Negative 5V Converter
Low Noise Regulators
2
R
VOUT = 1.25 1+
In some applications it is important not to introduce any
switching noise within the audio frequency range. Due to
the nature of the LTC1574 during Burst ModeTM operation,
there is a possibility that the regulator will introduce audio
noise at some load currents. To circumvent this problem,
a feed-forward capacitor can be used to shift the noise
spectrum up and out of the audio band. Figure 5 shows the
low noise connection with C2 being the feed-forward
capacitor. The peak-to-peak output ripple is reduced to
30mV over the entire load range. A toroidal surface mount
R1
For most applications, a 30k resistor is suggested for R1.
To prevent stray pickup, a 100pF capacitor is suggested
across R1 located close to the LTC1574.
V
OUT
R2
LTC1574
10
V
FB
100pF
R1
Burst Mode is a trademark of Linear Technology Corporation
1574 • F03
V
IN
+
5V
5
100µF*
10V
V
IN
Figure 3. LTC1574 Adjustable Configuration
LTC1574
7
12
11
6
L1**
100µH
LB
LB
SHDN
SW
IN
Inverting Applications
V
OUT
3.3V
425mA
3, 14
10
OUT
C2
6.8nF
The LTC1574 can easily be set up for a negative output
voltage. If –5V is desired, the LTC1574-5 is ideal for this
application as it requires the least components. Figure 4
shows the schematic for this application. Note that the
output voltage is now taken off the GND pins. Therefore,
the maximum input voltage is now determined by the
56k
I
V
FB
PGM
+
GND
100µF*
10V
33k
2, 4, 13, 15
* AVX TPSD107K010
** COILTRONICS CTX100-4
1574 • F05
Figure 5. Low Noise 5V to 3.3V Regulator
5
LTC1574
LTC1574-3.3/LTC1574-5
W U U
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APPLICATIO S I FOR ATIO
inductor L1 is chosen for its excellent self-shielding prop-
erties. Open magnetic structures such as drum and rod
cores are to be avoided since they inject high flux levels
into their surroundings. This can become a major source
of noise in any converter circuit.
For COUT, the RMS current rating should be at least:
IPEAK
IRMS
≈
ARMS
(
)
2
= 300mA
Absolute Maximum Ratings and Latchup Prevention
Design Example
The absolute maximum ratings specify that SW
(Pins 3, 14) can never exceed VIN (Pin 5) by more than
0.3V. Normally this situation should never occur. It could,
however, if the output is held up while the supply is pulled
down. A condition where this could potentially occur is
when a battery is supplying power to an LTC1574 regula-
tor and also to one or more loads in parallel with the the
regulator’s VIN. If the battery is disconnected while the
LTC1574 regulator is supplying a light load and one of the
parallel circuits is a heavy load, the input capacitor of the
LTC1574 regulator could be pulled down faster than the
output capacitor, causing the absolute maximum ratings
to be exceeded. The result is often a latchup which can be
destructive if VIN is reapplied. Battery disconnect is pos-
sibleasaresultofmechanicalstress, badbatterycontacts
or use of a lithium-ion battery with a built-in internal
disconnect. The user needs to assess his/her application
to determine whether this situation could occur. If so,
additional protection is necessary.
As a design example, assume VIN = 9V (nominal),
VOUT = 5V and IOUT = 350mA maximum. The LTC1574-5
is used for this application with IPGM (Pin 6) connected to
VIN. The minimum value of L is determined by assuming
the LTC1574-5 is operating in continuous mode.
I
PEAK
= I
OUT
AVG CURRENT
I
+ I
V
PEAK
2
=
I
V
= 350mA
TIME
1574 • F06
Figure 6. Continuous Inductor Current
WithIOUT =350mAandIPEAK =0.6A(IPGM =VIN),IV =0.1A.
The peak-to-peak ripple inductor current, IRIPPLE, is 0.5A
and is also equal to:
V
OUT + VD
I
RIPPLE = 4 •10−6
AP-P
Prevention against latchup can be accomplished by
simply connecting a Schottky diode across the SW and
VIN pins as shown in Figure 7. The diode will normally be
reverse biased unless VIN is pulled below VOUT at which
timethediodewillclampthe(VOUT –VIN)potentialtoless
than the 0.6V required for latchup. Note that a low
leakage Schottky should be used to minimize the effect
(
)
L
Solving for L in the above equation and with VD = 0.5V,
L = 44µH. The next higher standard value of L is 50µH
(example:CoiltronicsCTX50-4). Theoperatingfrequency,
ignoring voltage across diode VD is:
VOUT
f ≈ 2.5 •105 1−
VIN
LATCHUP
PROTECTION
SCHOTTKY
= 111kHz
With the value of L determined, the requirements for CIN
and COUT are calculated. For CIN, its RMS current rating
should be at least:
V
V
SW
LTC1574
OUT
IN
+
1/2
]
1574 F07
IOUT VOUT V − VOUT
(
IN
)
[
IRMS
=
ARMS
(
)
Figure 7. Preventing Absolute Maximum
Ratings from Being Exceeded
V
IN
= 174mA
6
LTC1574
LTC1574-3.3/LTC1574-5
W U U
APPLICATIO S I FOR ATIO
U
maximum allowable tolerance. To prevent this from
occuring, a resistor must be connected between VOUT
andgroundwithavaluelowenoughtosinkthemaximum
possible leakage current.
on no-load supply current. Schottky diodes such as
MBR0530, BAS85 and BAT84 work well. Another more
serious effect of the protection diode leakage is that at no
load with nothing to provide a sink for this leakage
current, the output voltage can potentially float above the
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TYPICAL APPLICATIO S
Low Noise, High Efficiency 3.3V Regulator
V
IN
4V TO 12.5V
+
22µF*
5
0.1µF
25V
V
IN
× 2
6
12
11
7
I
SHDN
PGM
LTC1574
10
LB
LB
V
FB
IN
†
6.8nF
56k
50µH
V
OUT
3, 14
SW
3.3V
OUT
450mA
GND
+
100µF**
10V
× 2
100pF
2, 4, 13, 15
* AVX TPSD226K025
33k
** AVX TPSD107K010
†
COILTRONICS CTX50-4
1574 TA03
U
PACKAGE DESCRIPTIO
Dimension in inches (millimeters) unless otherwise noted.
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
0.010 – 0.020
16
15
14
13
12
11
10
9
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
0.016 – 0.050
(0.406 – 1.270)
S16 1098
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
5
6
7
8
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.
7
LTC1574
LTC1574-3.3/LTC1574-5
U
TYPICAL APPLICATIO S
Low Dropout 5V Step-Down Regulator
High Efficiency 3.3V Regulator
with Low-Battery Detection
V
IN
5.5V to 12.5V
V
IN
4V TO 12.5V
+
22µF*
25V
5
5
47µF**
16V
+
0.1µF
4.7k
0.1µF
V
IN
× 2
V
IN
× 2
*LOW-
BATTERY
7
6
12
11
6
11
12
7
I
SHDN
PGM
I
SHDN
PGM
INDICATOR
LTC1574-3.3
V
OUT
LTC1574-5
10
V
OUT
10
3.3V
LB
LB
V
IN
OUT
SW
LB
LB
V
OUT
162k
5V
OUT
IN
†
425mA
50µH
365mA
3, 14
3, 14
OUT
SW
L1
100µH
+
47µF*
16V
× 2
†
+
47µF**
16V
× 2
GND
GND
47.5k
2, 4, 13, 15
2, 4, 13, 15
* AVX TPSD226K025
1574 TA05
** AVX TPSD476K016
1574 TA04
†
COILTRONICS CTX50-4
* LOW-BATTERY INDICATOR IS
SET UP TO TRIP AT V = 5.5V
IN
** AVX TPSD476K016
†
SELECTION
MANUFACTURER PART NO.
TYPE
COILTRONICS
SUMIDA
CTX100-4
CD75-101
SURFACE MOUNT
SURFACE MOUNT
GOWANDA
GA10-103K THROUGH HOLE
Positive to –5V Converter
V
IN
4V TO 12.5V
V
(V)
4
6
8
10
I
(mA)
OUT
IN
5
+
+
10µF**
35V
* LOW-BATTERY INDICATOR IS
SET TO TRIP AT V = 4.4V
** AVX TPSD106K035
*** AVX TPSD107K010
4.7k
110
140
170
200
235
0.1µF
V
IN
IN
× 2
*LOW-
6
11
12
7
BATTERY
I
SHDN
PGM
INDICATOR
LTC1574-5
10
12.5
†
LB
LB
V
SELECTION
MANUFACTURER PART NO.
COILTRONICS
COILCRAFT
SUMIDA
280k
OUT
IN
OUT
TYPE
SURFACE MOUNT
DT3316-473 SURFACE MOUNT
CD54-470 SURFACE MOUNT
GA10-472K THROUGH HOLE
3, 14
SW
CTX50-3
†
L1
50µH
100µF***
10V
GND
43k
2, 4, 13, 15
V
GOWANDA
OUT
1574 TA06
–5V
RELATED PARTS
PART NUMBER
LT®1074/LT1076
LTC1147
DESCRIPTION
COMMENTS
Step-Down Switching Regulator
100kHz, 5A (LT1074) or 2A (LT1076) Monolithic
8-Pin Controller
High Efficiency Step-Down DC/DC Controller
LTC1174
High Efficiency Step-Down and Inverting DC/DC Converter 0.5A, Burst Mode Operation, SO-8 Package, V to 18V
IN
LTC1265
1.2A High Efficiency Step-Down DC/DC Regulator
1.5A 500kHz Step-Down Switching Regulator
Inverting 1.4MHz Switching Regulator in SOT-23
1MHz Step-Down DC/DC Converter in SOT-23
High Efficiency Synchronous Step-Down Regulator
Burst Mode Operation, Monolithic
High Frequency Small Inductor
LT1375/LT1376
LT1611
–5V at 150mA from 5V Input, 1mV Output Ripple, SOT-23 Package
P-P
LTC1701
V
V
= 2.5V to 5.5V, I = 135µA, V
= 5V to 1.25V
OUT
IN
Q
LTC1707
= 2.85V to 8.5V, Selectable Burst Mode Operation,
IN
600mA Output Current, SO-8 Package
LTC1877/LTC1878 High Efficiency Synchronous Step-Down Regulator
600mA at V = 5V, 2.65V to 10V = V , I = 10µA
IN
IN Q
sn1574 1574fas LT/TP 1000 2K REV A • PRINTED IN
USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1995
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