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| 型号： | LT1680N |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封装： | POWER, PLASTIC, DIP-16 |
| 文件页数： | 3/6页 |
| 文件大小： | 301K |
| 代理商： | LT1680N |
Automotive 12V, 24V and 42V Systems
DC/DC Conversion Solutions – InfoCard 21
s PolyPhase
TM Regulators for Improved Performance
For high current step-down applications, two out-of-phase IC controllers provide significant improvements* and
reduced component cost that offset the cost of the second controller IC. Major benefits include:
s
Two Output Inductors 1/8 the Size of a Single Inductor
(Total 1/4 the Magnetics)
s
Significantly Reduced Output Ripple
s
Significantly Reduced Input Capacitor Ripple Current
Allows the use of Fewer Input Capacitors
s
Greatly Improved Transient Response—Two Smaller
Inductors: Slew Currents Are Additive
s
Minimizes the Size of MOSFETs, May Save the Need to
Parallel MOSFETs
3
s Selection Guide for 42V Automotive DC/DC Conversion
* Synchronous 2-switch transistor drive for maximum efficiency
** External comparator required
Plus minimum VCC load of a few mA
Plus FET charge currents
Package Codes: K = TO-3, N = Plastic Power DIP, R = 7-Lead DD, S = Narrow Small Outline, SW = Wide SO (0.300
"), T = TO-220,
PolyPhase is a trademark of Linear Technology Corporation.
*See
Linear Technology magazine, November 1998, p.27
5
10
11
13
14
7
4
6
8
12
3
1
2
9
AST
–T
+T
RET
RCC
SYNC1
VCC
VC
SS
SYNC2
NC
fOSC = 200kHz
CX
RX
RST
Q
OSC
GND
C1
0.1
F
C2
100pF
R2
16.5k
U1
CD4047
+
SYNC1
R1
10k
R7
10k
R4
0.010
1%
C4
0.1
F
25V
C3
150
F
16V
SANYO
OS-CON-SP
C14
1000pF
R5
191k
1%
R8
4.3k
R21
16k
R12
10.7k
1%
R13
1.24k
1%
Q7
MJD112
17
20
19
18
11
12
16
14
13
9
815
12V BIAS
D2
MMSZ4699T1
12V
D3
BAT54
D4
MBRS340L
FEEDBACK
D1
BAT54
12V
L1
15
H
VIN
42V
OUTPUT
12V
15A
C10
1000pF
C11
0.1
F
C15
1000pF
C16
6800pF
C12
2000pF
C13
1000pF
C7, 0.22
F
C6
0.1
F
50V
C33
1300pF
50V
C5
1500
F
50V
SANYO
MV-GX
C8
150
F
16V
SANYO
OS-CON-SA
C9
150
F
16V
SANYO
OS-CON-SA
Q2
IRFZ34S
Q4
IRFZ44S
SYNC
5VREF
SL/SDJ
1
2
4
SGND
PGND
U2
LT1339
12VIN
BOOST
TG
TS
S+
S–
BG
PHASE
RUN/SD
VFB
CT
IAVG
SS
VC
VREF
3
5
6
7
10
+
SYNC2
R15
0.010
1%
17
20
19
18
11
12
16
14
13
9
815
12V BIAS
D6
BAT54
D7
MBRS340L
FEEDBACK
L2
15
H
VIN
42V
C31
1000pF
C30
1000pF
C22, 0.22
F
C21
0.1
F
50V
C19
0.22
F
25V
C20
1500
F
50V
SANYO
MV-GX
C24
150
F
16V
SANYO
OS-CON-SA
C25
150
F
16V
SANYO
OS-CON-SA
Q5
IRFZ34S
Q6
IRFZ44S
SYNC
5VREF
SL/SDJ
1
2
4
SGND
PGND
U4
LT1339
12VIN
BOOST
TG
TS
S+
S–
BG
PHASE
RUN/SD
RUN
NC
VFB
CT
IAVG
SS
VC
VREF
SS
VC
3
5
6
7
10
R16
191k
1%
C28
1000pF
C29
0.1
F
IC21/1339
Design Approach for Very Low Ripple/Noise and Improved Transient Response
Regulator
VIN
IOUT
Synch
Burst
IQ
Shutdown
Circuit
Range
Drive*
Mode
Supply
Current
Package
Features
60V Input Step-Down Switching Regulators
LT1676
7.4V to 60V
10mA to 500mA
X**
3.2mA
30
A
S8
No Pulse Skipping at Light Load, 100kHz
LT1776
7.4V to 60V
10mA to 500mA
X**
3.2mA
30
A
S8
No Pulse Skipping at Light Load, 200kHz
LT1076HV
8V to 64V
to 2A
8.5mA
140
A
K,T,R
Onboard Switches
LT1074HV
8V to 64V
to 5A
8.5mA
140
A
K,T,T7
Low Quiescent Current
LTC1149
4V to 60V
to 5A
Yes
X
2mA
135
A
S16
High Efficiency over Wide Range
LT1339
10V to 60V
1A to 50A
Yes
14mA
65
A
N20, SW20
High Current N-Channel Drive
42V Output Step-Up (or SEPIC) Switching Regulators
LT1680
10V to 60V
1A to 50A
12mA
65
A
N16, SW16
To 10,000pF Gate Capacitance
LT1339
10V to 60V
1A to 50A
Yes
16mA
65
A
N20, SW20
Adaptive Gate Drive
LTC1624
3.5V to 36V
10A
X
550
A16A
S8
Optimum Load Step Response
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