LTC1174HVCN8 Linear Technology, LTC1174HVCN8 Datasheet

IC DC/DC CONV STP-DWN&INVRT 8DIP

LTC1174HVCN8

Manufacturer Part Number
LTC1174HVCN8
Description
IC DC/DC CONV STP-DWN&INVRT 8DIP
Manufacturer
Linear Technology
Type
Step-Down (Buck), Invertingr
Datasheet

Specifications of LTC1174HVCN8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.25 ~ 18 V
Current - Output
1A
Frequency - Switching
200kHz
Voltage - Input
4 ~ 18.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1174HVCN8
Manufacturer:
LT
Quantity:
5 510
Part Number:
LTC1174HVCN8
Manufacturer:
LT
Quantity:
5 510
Part Number:
LTC1174HVCN8
Manufacturer:
LT
Quantity:
20 000
Part Number:
LTC1174HVCN8#PBF
Quantity:
887
Part Number:
LTC1174HVCN8-3.3
Manufacturer:
LT
Quantity:
76
Part Number:
LTC1174HVCN8-3.3
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1174HVCN8-5
Manufacturer:
LT
Quantity:
200
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
High Efficiency: Up to 94%
Peak Inductor Current Independent of
Inductor Value
Short-Circuit Protection
Optimized for 5V to – 5V Applications
Wide V
Low Dropout Operation
Low-Battery Detector
Pin Selectable Current Limit
Internal 0.9Ω Power Switch: V
Only Four External Components Required
130µA Standby Current
Active Low Micropower Shutdown
**
Distributed Power Systems
Step-Down Converters
Inverting Converters
Memory Backup Supply
Portable Instruments
Battery-Powered Equipment
*
V
9V
(3) AVX TPSD156K025
AVX TPSD107K010
COILTRONICS CTX100-4
IN
IN
Range: 4V to 18.5V
High Efficiency Step-Down Converter
3
2
7
LB
LB
I
PGM
IN
OUT
LTC1174-5
U
GND
V
SHUTDOWN
IN
4
6
V
OUT
SW
8
1
5
IN
U
1N5818
= 9V
100µH
+
+
100µF**
10V
15µF*
25V
×3
1174 TA01
5V
175mA
DESCRIPTIO
The LTC
ideally suited for 9V to 5V, 5V to 3.3V or 5V to – 5V
operation. With an internal 0.9Ω switch (at a supply
voltage of 9V), the LTC1174 requires only four external
components to construct a complete high efficiency
DC/DC converter.
Under a no load condition the LTC1174 draws only 130µA.
In shutdown, it draws a mere 1µA making this converter
ideal for current sensitive 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.
The maximum inductor current of the LTC1174 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.
For applications requiring higher output current or ultra-
high efficiency, see the LTC1148 data sheet.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Step-Down and Inverting
®
LTC1174-3.3/LTC1174-5
1174 is a simple current mode DC/DC converter
100
95
90
85
80
75
70
1
DC/DC Converter
LTC1174-5 Efficiency
U
V
LOAD CURRENT (mA)
IN
= 6V
High Efficiency
10
V
IN
= 9V
L = 100µH
V
I
PGM
OUT
100
= 0V
= 5V
1174 TA02
LTC1174
200
1174fe
1

Related parts for LTC1174HVCN8

LTC1174HVCN8 Summary of contents

Page 1

... For applications requiring higher output current or ultra- high efficiency, see the LTC1148 data sheet. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. + 15µF* 25V × ...

Page 2

... LTC1174CN8 LTC1174CN8-3.3 LTC1174CN8-5 LTC1174IN8 LTC1174HVCN8 LTC1174HVCN8-3.3 LTC1174HVCN8-5 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER Output Voltage Load Regulation I Input DC Supply Current (Note Low-Battery Trip Point LBTRIP I Current into Pin 3 LBIN I Current Sunk by Pin 2 ...

Page 4

LTC1174 LTC1174-3.3/LTC1174-5 ELECTRICAL CHARACTERISTICS Note 3: Guaranteed by design. Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Load Current 100 95 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Line Regulation 100mA LOAD PGM 2 0 – 2 – 4 – 6 – 8 –10 –12 – ...

Page 6

LTC1174 LTC1174-3.3/LTC1174 CTIO (Pin 1): For the LTC1174, this pin connects to the OUT FB main voltage comparator’s input. On the LTC1174-3.3 and LTC1174-5 this pin goes to an internal resistive ...

Page 7

... RIPPLE By choosing a smaller inductor, a low ESR output filter capacitor has to be used (see C loss will also increase (see Inductor Core Selection section) due to higher ripple current. Burst Mode is a registered trademark of Linear Technology Corporation. until its voltage drops LTC1174 − ⎛ ...

Page 8

LTC1174 LTC1174-3.3/LTC1174 APPLICATIO S I FOR ATIO Inductor Core Selection With the value of L selected, the type of inductor must be chosen. Basically there are two kinds of losses in an inductor, core and copper Core losses ...

Page 9

U U APPLICATIO S I FOR ATIO Catch Diode Selection The catch diode carries load current during the off-time. The average diode current is therefore dependent on the P-channel switch duty cycle. At high input voltages the diode conducts most ...

Page 10

LTC1174 LTC1174-3.3/LTC1174 APPLICATIO S I FOR ATIO 6.8nF** 1 LTC1174 V FB 100pF* * ADJUSTABLE APPLICATIONS ** LOW NOISE APPLICATIONS Figure 4. LTC1174 Adjustable Configuration INPUT VOLTAGE 4V TO 12V 6 0.1µ SHUTDOWN ...

Page 11

U U APPLICATIO S I FOR ATIO Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the LTC1174. These items are also illustrated graphically in the layout diagram ...

Page 12

LTC1174 LTC1174-3.3/LTC1174 APPLICATIO S I FOR ATIO Solving for L in the above equation and with 44.8µH. The next higher standard value 50µH (example: Coiltronics CTX50-4). The operating frequency, neglecting voltage across ...

Page 13

U TYPICAL APPLICATIO Step-Down Regulator with Low-Battery Detection LOW-BATTERY INDICATOR * IS SET TO TRIP 5.5V IN AVX TPSD476K016 ** = MBRS140T3 (SURFACE MOUNT) D1 1N5818 † L1 SELECTION MANUFACTURER PART NO. TYPE ...

Page 14

LTC1174 LTC1174-3.3/LTC1174-5 U TYPICAL APPLICATIO S INPUT VOLTAGE 4V TO 12.5V AVX TPSD226K025 * AVX TPSD105K010 ** † COILTRONICS CTX50-4 * LOW-BATTERY INDICATOR V ( SET TO TRIP 4. AVX TPSD106K035 6 ...

Page 15

U TYPICAL APPLICATIO S * LOW-BATTERY INDICATOR IS SET TO TRIP 4. ( AVX TPSD336K020 4 *** AVX TPSD105K010 MBRS140T3 (SURFACE MOUNT) 6 1N5818 7 † L1 SELECTION MANUFACTURER ...

Page 16

LTC1174 LTC1174-3.3/LTC1174-5 U TYPICAL APPLICATIO S INPUT VOLTAGE 6V TO 12.5V * SANYO OS-CON AVX TPSD476K016 ** = MBRS140T3 (SURFACE MOUNT) D1 1N5818 † L1 SELECTION MANUFACTURER PART NO. TYPE COILTRONICS CTX50-3 SURFACE MOUNT COILCRAFT DT3316-473 SURFACE MOUNT SUMIDA CD54-470 ...

Page 17

U TYPICAL APPLICATIO S SANYO OS-CON * WIMA MKS2 ** † COILTRONICS CTX100-4 V (V) I (mA) IN OUT MAX 100 8 125 10 145 12 160 13 180 3 2 CTX100-4 L1A L1B ...

Page 18

LTC1174 LTC1174-3.3/LTC1174-5 U TYPICAL APPLICATIO S INPUT VOLTAGE 6V TO 12.5V TPO610L + 100µF* 20V SANYO OS-CON CAPACITOR * † COILTRONICS CTX50-4 * SANYO OS-CON ** WIMA MKS2 † COILTRONICS CTX100 CTX100-4 L1B Automatic Current ...

Page 19

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 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- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 20

... OUT 4 NiCAD BATTERY † L1 150k + 50µH 100µF** 10V 33k 1174 TA15 Output Ripple, SOT-23 Package P-P = 135µ 1.25V Q OUT = 5V, 2.65V to 10V = 10µ 1006 REV E • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994 1174fe ...

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