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参数资料
| 型号： | LT1339N |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDIP20 |
| 封装： | POWER, PLASTIC, DIP-20 |
| 文件页数： | 4/6页 |
| 文件大小： | 301K |
| 代理商： | LT1339N |
4
Automotive 12V, 24V and 42V Systems
DC/DC Conversion Solutions – InfoCard 21
s 42V Step-Down (Integrated Switch)
LT1074 Series: High Voltage, High Efficiency Switching Voltage Regulators
s
Input Voltage Range to 60V or 75V
s
1A, 2A and 5A Onboard Switches (see Table, p.6)
s
Current Mode Operation, May Be Synchronized to
External Clock
s
Few External Components
s
Low Quiescent Current: < 10mA
s
Micropower Shutdown Mode
s
Pulse-by-Pulse Programmable Current Limiting
s
Low Thermal Resistance Packages
LT1676/LT1776: High Efficiency Step-Down Switching Regulators
s
Wide Input Range: 7.4V to 60V*
s
True Current Mode Control
s
700mA Peak Switch Current
s
Adaptive Switch Drive Prevents Pulse Skipping at Light Loads
s
Fixed Frequency LT1676: 100kHz, LT1776: 200kHz
s
LT1676 Is Synchronizable to 250kHz (LT1776 to 400kHz)
s
Micropower Shutdown Mode
s
8-Pin SO and Power DIP Packages
OUTPUT LOAD CURRENT (A)
0
EFFICIENCY
(%)
60
70
80
90
12
3
4
5
6
100
50
L = 50
H TYPE 52 CORE
DIODE = MBR735
V
= 5V, V
= 15V
OUT
IN
V
= 12V, V
= 20V
OUT
IN
LT1074
Buck Converter Efficiency
VSW
VIN
VC
GND
FB
LT1074HV
5V
5A
C1
500
F
R1
2.8k
1%
R2
2.21k
1%
MBR745*
10V
TO 60V
C3
200
F
R3
2.7k
C2
0.01
F
L1**
50
H (LT1074)
100
H (LT1076)
* USE MBR340 FOR LT1076
** COILTRONICS
#50-2-52 (LT1074)
#100-1-52 (LT1076)
PULSE ENGINEERING, INC.
#PE-92114 (LT1074)
#PE-92102 (LT1076)
HURRICANE
#HL-AK147QQ (LT1074)
#HL-AG210LL (LT1076)
RIPPLE CURRENT RATING
≥ IOUT/2
25V
+
Basic Positive Buck Converter
* The LT1776 is limited to 40V continuous DC input due to thermal constraints, but can withstand transients up to 60V.
39
F
63V
1676 F01
VIN
VCC
VSW
LT1676
FB
VC
SHDN
SYNC
2
5
4
3
7
8
1
6
GND
+
100
F
10V
+
MBR160
36.5k
1%
5V
400mA
12.1k
1%
22k
220
H*
2200pF
VIN
7.4V TO 60V
100pF
*65T #30 ON MAGNETICS
MPP #55030
ILOAD (mA)
1
60
EFFICIENCY
(%)
70
80
90
10
100
1000
1676 TA01
50
40
30
20
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
Efficiency vs VIN and ILOAD
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