LTC1148HVCN#PBF datasheet, PDF

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LTC1148HVCN#PBF: DescriptionDC/DC Cntrlr Single-OUT Step Down 0.05A 250kHz 14-Pin PDIP N Tube; File Size270KB，20 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LTC1148HVCN#PBF Overview

DC/DC Cntrlr Single-OUT Step Down 0.05A 250kHz 14-Pin PDIP N Tube

LTC1148HVCN#PBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Number of Outputs	1
Topology	Step Down
Maximum Output Current (A)	0.05
Maximum Switching Frequency (kHz)	250
Minimum Input Voltage (V)	3.5
Maximum Input Voltage (V)	20
Operating Supply Voltage (V)	3.5 to 20
Maximum Supply Current (mA)	2.3
Synchronous Rectifier	Yes
Synchronous Clock	No
Programmability	Yes
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	85
Supplier Temperature Grade	Automotive
Packaging	Tube
Supplier Package	PDIP N
Pin Count	14
Standard Package Name	DIP
Mounting	Through Hole
Package Height	3.3
Package Length	19.56(Max)
Package Width	6.48
PCB changed	14
Lead Shape	Through Hole

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LTC1148

LTC1148-3.3/LTC1148-5

High Efficiency Synchronous

Step-Down Switching Regulators

FEATURES

■

DESCRIPTIO

Ultrahigh Efficiency: Over 95% Possible

Current-Mode Operation for Excellent Line and Load

Transient Response

High Efficiency Maintained Over Three Decades of

Output Current

Low 160µA Standby Current at Light Loads

Logic Controlled Micropower Shutdown: I

< 20µA

Wide V

Range: 3.5V* to 20V

Short-Circuit Protection

Very Low Dropout Operation: 100% Duty Cycle

Synchronous FET Switching for High Efficiency

Adaptive Nonoverlap Gate Drives

Output Can Be Externally Held High in Shutdown

Available in 14-Pin Narrow SO Package

The LTC

1148 series is a family of synchronous step-

down switching regulator controllers featuring automatic

Burst Mode

operation to maintain high efficiencies at

low output currents. These devices drive external comple-

mentary power MOSFETs at switching frequencies up to

250kHz using a constant off-time current-mode architec-

ture providing constant ripple current in the inductor.

The operating current level is user-programmable via an

external current sense resistor. Wide input supply range

allows operation from 3.5V* to 18V (20V maximum).

Constant off-time architecture provides low dropout regu-

lation limited by only the R

DS(ON)

of the external MOSFET

and resistance of the inductor and current sense resistor.

The LTC1148 series combines synchronous switching for

maximum efficiency at high currents with an automatic low

current operating mode, called Burst Mode operation, which

reduces switching losses. Standby power is reduced to only

2mW at V

= 10V (at I

OUT

= 0). Load currents in Burst Mode

operation are typically 0mA to 300mA.

For operation up to 48V input, see the LTC1149 and

LTC1159 data sheets and Application Note 54.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Burst Mode is a trademark of Linear Technology Corporation.

* LTC1148L and LTC1148L-3.3 only.

Protected by U.S. Patents, including 6580258, 5481178.

APPLICATIO S

■

Notebook and Palmtop Computers

Portable Instruments

Battery-Operated Digital Devices

Cellular Telephones

DC Power Distribution Systems

GPS Systems

TYPICAL APPLICATIO

1µF

P-DRIVE

LTC1148HV-5

SHUTDOWN

SENSE

–

N-DRIVE

SGND

PGND

(5.2V TO 18V)

P-CHANNEL

Si4431DY

62µH

100µF

0V = NORMAL

>1.5V = SHUTDOWN

OUT

5V/2A

EFFICIENCY (%)

SENSE

0.05Ω

1000pF

N-CHANNEL

Si4412DY

MBRS140T3

3300pF

470pF

OUT

390µF

LT1148 • TA01

COILTRONICS CTX62-2-MP

KRL SL-1-C1-0R050J

Figure 1. High Efficiency Step-Down Converter

114835fd

Downloaded from

Arrow.com.

LTC1148-5 Efficiency

100

= 6V

= 10V

0.02

0.2

LOAD CURRENT (A)

LTC1148 • TA01

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