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LTC3424EMS#PBF

P1-P3P4-P6P7-P9P10-P12
10
LTC3423/LTC3424
34234f
APPLICATIO S I FOR ATIO
WUUU
G
DC
= G
CONTROLOUTPUT
• G
EA
G
V
I
CONTROL
IN
OUT
=
2•
, G
EA
≈ 2000
The output filter pole is given by:
f
I
VC
Hz
FILTERPOLE
OUT
OUT OUT
=
π••
where C
OUT
is the output filter capacitor.
The output filter zero is given by:
f
RC
Hz
FILTERZERO
ESR OUT
=
1
2• • •π
where R
ESR
is the capacitor equivalent series resistance.
A troublesome feature of the boost regulator topology is
the right half plane zero (RHP) and is given by:
f
VR
LV
Hz
RHPZ
IN O
O
=
2
2
2
•
•••π
At heavy loads this gain increase with phase lag can occur
at a relatively low frequency. The loop gain is typically
rolled off before the RHP zero frequency.
Figure 3
–
+
1.25V
FB
ERROR
AMP
V
OUT
8
V
C
C
C1
C
C2
3423/24 F03
R
Z
R2
R1
9
The typical error amp compensation is shown in Figure 3.
The equations for the loop dynamics are as follows:
f
C
Hz
whichisextremelyclose toDC
f
RC
Hz
f
RC
Hz
POLE
C
ZERO
ZC
POLE
ZC
1
6
1
1
1
2
2
1
22010
1
2
1
2
≈
=
≈
•• • •
•• •
•• •
π
π
π
Refer to Application Note AN76 for more closed loop
examples.
3
10
2
6
1
3423/24 TA03
V
IN
SHDN
MODE/SYNC
V
DD
R
t
SW
V
OUT
FB
V
C
GND
4
7
8
9
5
V
OUT
V
IN
= 0.9V TO 1.5V
RB*
C5
1µF
* SET RB TO FORCE BETA OF ≤100; RB =
(V
OUT
– V
INMIN
– 0.7V) • 100
I
OUTMAX
ZETEX
FMMT717
V
DD
0 = FIXED FREQ
1 = Burst Mode OPERATION
LTC3423/LTC3424
U
TYPICAL APPLICATIO
Typical Application with Output Disconnect
11
LTC3423/LTC3424
34234f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
MSOP (MS) 1001
0.53 ± 0.01
(.021 ± .006)
SEATING
PLANE
0.18
(.007)
1.10
(.043)
MAX
0.17 – 0.27
(.007 – .011)
0.13 ± 0.05
(.005 ± .002)
0.86
(.034)
REF
0.50
(.0197)
TYP
12
3
45
4.88 ± 0.10
(.192 ± .004)
0.497 ± 0.076
(.0196 ± .003)
REF
8910
7
6
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
3.00 ± 0.102
(.118 ± .004)
NOTE 4
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.254
(.010)
0
° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
0.889
± 0.127
(.035 ± .005)
RECOMMENDED SOLDER PAD LAYOUT
3.05 ± 0.38
(.0120 ± .0015)
TYP
0.50
(.0197)
BSC
6
10
3
2
1
LTC3423
V
DD
SHDN
V
IN
MODE/SYNC
R
t
SW
V
OUT
FB
V
C
GND
4
7
8
9
5
C4
470pF
C2
4.7µF
R
C
82k
R
t
30.1k
f
OSC
= 1MHz
R1
110k
R2
249k
L1
4.7µH
D1
C3
22µF
C1: TAIYO YUDEN JMK212BJ225MG
C2: TAIYO YUDEN JMK212BJ475MM
C3: TAIYO YUDEN JMK325BJ226MM
D1: ON SEMICONDUCTOR MBRM120T3
L1: SUMIDA CDRH3D16-4R7M
V
DD
= 2.7V TO 5.5V
V
IN
= 0.9V TO 1.5V
0 = FIXED FREQ
1 = Burst Mode OPERATION
C5
4.7pF
3423/24 TA04
V
OUT
1.8V
300mA
1
CELL
V
DD
IN
+
–
C1
2.2µF
U
TYPICAL APPLICATIO
Single Cell to 1.8V at 300mA, 1.8mm High
U
PACKAGE DESCRIPTIO
12
LTC3423/LTC3424
34234f
LT/TP 0302 2K • PRINTED IN USA
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ThinSOT is a trademark of Linear Technology Corporation.
LINEAR TECHNOLOGY CORPORATION 2001
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
6
10
3
2
1
LTC3423
D1
V
DD
SHDN
V
IN
MODE/SYNC
R
t
SW
V
OUT
FB
V
C
GND
4
7
8
9
5
C4
470pF
C2
10µF
RC
82k
R
t
30.1k
f
OSC
= 1MHz
R1
110k
R2
249k
L1
2.2µH
C3
44µF
(2× 22µF)
C1: TAIYO YUDEN JMK212BJ225MG
C2: TAIYO YUDEN JMK212BJ106MM
C3: TAIYO YUDEN JMK325BJ226MM
D1: ON SEMICONDUCTOR MBRM120T3
D2 TO D7: ZETEX FMND7000 DUAL DIODE
L1: SUMIDA CD43-2R2M
V
DD
= 2.7V TO 5.5V
V
IN
= 0.9V TO 1.5V
0 = FIXED FREQ
1 = Burst Mode OPERATION
C5
4.7pF
3423/24 TA05
V
OUT
1.8V
700mA
1
CELL
V
DD
IN
+
–
C1
2.2µF
D2 D3
0.1µF 0.1µF 0.1µF
4.7µF
0.1µF
4.7µF
–1.1V
1mA
D6
3.6V
2mA
D4 D5
D7
U
TYPICAL APPLICATIO
Triple Output Converter
P1-P3P4-P6P7-P9P10-P12

LTC3424EMS#PBF

Mfr. #:
Buy LTC3424EMS#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators L Out V, 3MHz uP Sync Boost Convs
Lifecycle:
New from this manufacturer.
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