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LTC1775C 데이터시트 PDF




Linear Technology에서 제조한 전자 부품 LTC1775C은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 LTC1775C 기능
기능 High Power No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator
제조업체 Linear Technology
로고 Linear Technology 로고


LTC1775C 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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LTC1775C 데이터시트, 핀배열, 회로
FEATURES
s Highest Efficiency Current Mode Controller
s No Sense Resistor Required
s 300mV Maximum Current Sense Voltage
s Stable High Current Operation
s Dual N-Channel MOSFET Synchronous Drive
s Wide VIN Range: 4V to 36V
s Wide VOUT Range: 1.19V to VIN
s ±1% 1.19V Reference
s Programmable Fixed Frequency with Injection Lock
s Very Low Drop Out Operation: 99% Duty Cycle
s Forced Continuous Mode Control Pin
s Optional Programmable Soft Start
s Pin Selectable Output Voltage
s Foldback Current Limit
s Output Overvoltage Protection
s Logic Controlled Micropower Shutdown: IQ < 30µA
s Available in 16-Lead Narrow SSOP and SO Packages
U
APPLICATIO S
s Notebook Computers
s Automotive Electronics
s Battery Chargers
s Distributed Power Systems
LTC1775
High Power
No RSENSETM Current Mode
Synchronous Step-Down
Switching Regulator
DESCRIPTIO
The LTC®1775 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using few external components. Current mode
control with MOSFET VDS sensing eliminates the need for
a sense resistor and improves efficiency. Largely similar
to the LTC1625, the LTC1775 has twice the maximum
sense voltage for high current applications. The frequency
of a nominal 150kHz internal oscillator can be synchro-
nized to an external clock over a 1.5:1 frequency range.
Burst ModeTM operation at low load currents reduces
switching losses and low dropout operation extends oper-
ating time in battery-powered systems. A forced continu-
ous mode control pin can assist secondary winding
regulation by disabling Burst Mode operation when the
main output is lightly loaded.
Fault protection is provided by foldback current limiting
and an output overvoltage comparator. An external ca-
pacitor attached to the RUN/SS pin provides soft start
capability for supply sequencing. A wide supply range
allows operation from 4V (4.3V for LTC1775I) to 36V at the
input and 1.19V to VIN at the output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No RSENSE and Burst Mode are trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
CC
2.2nF
CSS 0.1µF
LTC1775
SYNC
VIN
TK
RUN/SS TG
VPROG
SW
BOOST
RC
10k
ITH INTVCC
SGND
BG +
VOSENSE PGND
CB 0.33µF
DB
CMDSH-3
CVCC
4.7µF
+
M1
SUD50N03-10 L1
6µH
D1
MBRS340
M2
SUD50N03-10
CIN
22µF
VIN
5V TO
28V
30V
×4
VOUT
3.3V
+ COUT 10A
680µF
6.3V
1775 F01
Figure 1. High Efficiency Step-Down Converter
Efficiency vs Load Current
100
VIN = 10V
f = 150kHz
95 FCB = INTVCC
VOUT = 5V
90 VOUT = 3.3V
85
80
75
70
0.01
0.1 1
LOAD CURRENT (A)
10
1775 F01b
1




LTC1775C pdf, 반도체, 판매, 대치품
LTC1775
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Load Current
100
90
80
CONTINUOUS
BURST
MODE
MODE
70
60
50
0.001
VIN = 10V
VOUT = 5V
EXTVCC = VOUT
0.01 0.1
1.0
LOAD CURRENT (A)
10
1775 • G01
Efficiency vs Input Voltage
100
95 ILOAD = 5A
90
ILOAD = 500mA
85
80
75
70
0
VOUT = 5V
FIGURE 1 CIRCUIT
5 10 15 20 25 30
INPUT VOLTAGE (V)
1775 • G02
Load Regulation
0
FIGURE 1 CIRCUIT
– 0.1
– 0.2
– 0.3
– 0.4
– 0.5
0
2 4 68
LOAD CURRENT (A)
10
1775 • G04
Input and Shutdown Current
vs Input Voltage
1200
60
1000
EXTVCC OPEN
50
800 40
SHUTDOWN
600 30
400 20
EXTVCC = 5V
200 10
00
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
1775 • G07
ITH Pin Voltage vs Load Current
3.0
FIGURE 1 CIRCUIT
VIN = 20V
2.5 VOUT = 5V
2.0
1.5
CONTINUOUS
MODE
1.0
0.5
BURST
MODE
0
02
4 6 8 10
LOAD CURRENT (A)
12 14
1775 • G05
INTVCC Load Regulation
1.0
VIN = 15V
0.5
0
– 0.5
–1.0
0
10 20 30 40 50
INTVCC LOAD CURRENT (mA)
1775 • G08
Efficiency vs Input Voltage
100
95
ILOAD = 5A
90
ILOAD = 500mA
85
80
75
70
0
VOUT = 3.3V
FIGURE 1 CIRCUIT
5 10 15 20 25 30
INPUT VOLTAGE (V)
1775 • G03
VIN – VOUT Dropout Voltage
vs Load Current
400
FIGURE 1 CIRCUIT
VOUT = 5V, 5% DROP
300
200
100
0
0 2 4 6 8 10
CURRENT LOAD (A)
1775 • G06
EXTVCC Switch Drop
vs INTVCC Load Current
500
VIN = 15V
EXTVCC = 5V
400
300
200
100
0
0 10 20 30 40 50
INTVCC LOAD CURRENT (mA)
1775 • G09
4

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LTC1775C 전자부품, 판매, 대치품
W
FU CTIO AL DIAGRA
LTC1775
INTVCC
INTVCC
2 SYNC
+
TA
× 5.5
TK
15
VIN
+
CIN
0.95V
BA
× 5.5
ITH
5
RC
CC1
0.6V
RUN/SS
3
CSS
SGND
6
+–
0.7V
+
ITHB I1
CL
+
VFB
gm = 1m
+
0.5V
1.19V
VIN
EA
+
+–
0.6V
3µA
+
6V
1.28V
OV
+
1.19V
+
F
OSC +
REV
I2
S
Q TOP
R
SLEEP
B
SHUTDOWN
SWITCH
LOGIC/
DROPOUT
COUNTER
OVERVOLTAGE
FCNT
INTVCC
1µA
1.19V
REF
5.2V
LDO REG
8 VPROG
7 VOSENSE
4 FCB 1 EXTVCC
BOOST
12
TG
13
SW
14
INTVCC
11 +
BG
10
PGND
9
CB
M1
DB
CVCC
M2
VIN
16
+ 4.7V
L1
+ VOUT
COUT
1775 BD
7

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High Power No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator

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LTC1775C

High Power No RSENSE TM Current Mode Synchronous Step-Down Switching Regulator

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