LTC3824EMSE-PBF LINER [Linear Technology], LTC3824EMSE-PBF Datasheet

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LTC3824EMSE-PBF

Manufacturer Part Number
LTC3824EMSE-PBF
Description
High Voltage Step-Down Controller With 40?A Quiescent Current
Manufacturer
LINER [Linear Technology]
Datasheet
FEATURES
APPLICATIONS
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TYPICAL APPLICATION
5.5V TO 60V
Wide Input Range: 4V to 60V
Current Mode Constant Frequency PWM
Very Low Dropout Operation: 100% Duty Cycle
Programmable Switching Frequency:
200kHz to 600kHz
Selectable High Effi cient Burst Mode
40μA Quiescent Current
Easy Synchronization
8V, 2A Gate Drive (V
Voltage P-channel MOSFET
Programmable Soft-Start
Programmable Current Limit
Available in a Small 10-Pin Thermally Enhanced
MSE Package
Industrial and Automotive Power Supplies
Telecom Power Supplies
Distributed Power Systems
100V
33μF
V
C
392k
IN
IN
+
0.1μF
R
GND
SYNC/MODE
0.1μF
C
SET
SS
CAP
LTC3824
5V/2A Buck Converter
CAP
V
C
CC
10k
SENSE
3.3nF
GATE
> 10V) for Industrial High
V
V
CC
FB
R
0.025Ω
S
22μH
®
51Ω
Operation:
100pF
422k
80.6k
3824 TA01
C
100μF
OUT
2
DESCRIPTION
V
5V
2A
The LTC
to drive an external P-channel MOSFET. With a wide input
range of 4V to 60V and a high voltage gate driver, the
LTC3824 is suitable for many industrial and automotive
high power applications. Constant frequency current mode
operation provides excellent performance.
The LTC3824 can be confi gured for Burst Mode operation.
Burst Mode operation enhances low current effi ciency
(only 40μA quiescent current) and extends battery run
time. The switching frequency can be programmed up to
600kHz and is easily synchronizable.
Other features include current limit, soft-start, micropower
shutdown, and Burst Mode disable.
The LTC3824 is available in a 10-lead MSE power package.
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5731964.
OUT
High Voltage Step-Down
®
3824 is a step-down DC/DC controller designed
Effi ciency and Power Loss vs Load Current
100
90
80
70
60
50
Controller With 40µA
10
EFFICIENCY
POWER LOSS
Quiescent Current
LOAD CURRENT (mA)
100
V
IN
= 40V
V
V
IN
IN
V
IN
= 12V
= 40V
= 12V
1000
LTC3824
3824 TA01a
2000
2.5
2.0
1.5
1.0
0.5
0
3824fc
1

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LTC3824EMSE-PBF Summary of contents

Page 1

FEATURES n Wide Input Range 60V n Current Mode Constant Frequency PWM n Very Low Dropout Operation: 100% Duty Cycle n Programmable Switching Frequency: 200kHz to 600kHz n Selectable High Effi cient Burst Mode 40μA Quiescent Current n ...

Page 2

... LTC3824IMSE#PBF LTC3824IMSE#TRPBF LEAD BASED FINISH TAPE AND REEL LTC3824EMSE LTC3824EMSE#TR LTC3824IMSE LTC3824IMSE#TR Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T otherwise specifi ed. PARAMETER V Threshold for Switching Off C Soft-Start Current Burst Mode Threshold C V Burst Mode Threshold Hysteresis C SENSE Voltage at Burst Mode ...

Page 4

LTC3824 TYPICAL PERFORMANCE CHARACTERISTICS ( Low CC CAP GATE DRIVE 8.5 8.4 8.3 8.2 8.1 8.0 7.9 7.8 7.7 7 (mA) GATE V Change vs V REF CC ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Burst Mode Operation V V =12V 5V OUT LOAD V OUT 50mV/DIV INDUCTOR CURRENT 1A/DIV 50μs/DIV PIN FUNCTIONS GND (Pin 1): Chip Ground Pin. SYNC/MODE (Pin 2): Synchronization Input and Burst Mode Operation ...

Page 6

LTC3824 BLOCK DIAGRAM + + 1.1V – SS 1.8V 2.5V 0.3μA 100k SYNC/ – MODE + + M2 + 50pF – 1.5V R SET OSC R FREQ + SHUTDOWN Y6 – GND Burst Mode OPERATION CONTROL APPLICATIONS INFORMATION ...

Page 7

APPLICATIONS INFORMATION Burst Mode Operation The LTC3824 can be confi gured for Burst Mode operation to enhance light load effi ciency (only 40μA quiescent current) and extend battery run time by leaving the SYNC/MODE pin open or pulling it higher ...

Page 8

LTC3824 APPLICATIONS INFORMATION Inductor Selection The maximum inductor current is determined RIPPLE I L(MAX) OUT(MAX – • OUT where I RIPPLE f • and ...

Page 9

APPLICATIONS INFORMATION on the P-channel switch duty cycle. At high input voltages the diode conducts most of the time the diode conducts only a small fraction of the time. OUT The worst condition for the diode is ...

Page 10

LTC3824 APPLICATIONS INFORMATION 2. Power MOSFET switching and condution losses OUT D (1+ δ) MOSFET OUT + K )(C )(f) IN OUT RSS 2 ...

Page 11

TYPICAL APPLICATION V IN 12.5V TO 60V C IN2 2.2μF 100V + C IN1 33μF 100V 301k 0.1μF PACKAGE DESCRIPTION 2.794 0.102 (.110 .004) 5.23 2.083 0.102 (.206) (.082 .004) MIN 0.305 0.038 0.50 (.0120 .0015) (.0197) BSC TYP RECOMMENDED ...

Page 12

LTC3824 TYPICAL APPLICATION V IN 4.5V TO 60V C IN2 2.2μF 100V + C IN1 33μF 100V SYNC/MODE R SET 301k GND SS 0.1μF RELATED PARTS PART NUMBER DESCRIPTION LTC1624 36V Current Mode Controller LT1976 60V Monolithic Regulator LT3724 60V ...

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