LTC3458L
13
3458lfa
The typical error amp compensation is shown in Figure 2.
The equations for the loop dynamics are as follows:
f
eCC
which is close to DC
f
RCC
f
RCC
POLE
ZERO
Z
POLE
Z
1
6
1
2
1
210 1
1
21
1
22
=
π
π
π
••
••
••
+
7
8
COMP
FB
ERROR
AMP
1.225V
V
OUT
R1
R2
CC1
CC2
R
Z
3458L F01
Figure 2
APPLICATIO S I FOR ATIO
WUUU
LTC3458L
14
3458lfa
TYPICAL APPLICATIO S
U
V
IN
GND/PGND
SHDN
SYNC
R
T
I
LIM
SW
V
OUT
FB
COMP
SS
BURST
LTC3458L
Li-Ion
3.1V to 4.2V
2.2μF
COILCRAFT
10μH
MSS7341
ON OFF
274k 84.5k 133k
324k
33k
0.01μF
0.01μF
560pF
10pF
10pF
1M
22μF
X5R
V
OUT
5V
750mA
3458L TA03a
V
IN
GND/PGND
SHDN
SYNC
R
T
I
LIM
SW
V
OUT
FB
COMP
SS
BURST
LTC3458L
2 ALKALINE
1.8V to 3.3V
2.2μF
COILCRAFT
10μH
MSS7341
ON OFF
274k 84.5k 133k
324k
33k
0.01μF
0.01μF
560pF
10pF
1M
22μF
X5R
V
OUT
5V
250mA
3458L TA04a
10pF
Lithium-Ion to 5V, 750mA at 750kHz
Two Cell to 5V
OUT
, 250mA at 750kHz
LOAD CURRENT (mA)
EFFICIENCY (%)
100
95
90
85
80
75
70
0.1 10 100 1000
3458L TA03b
1
4.2V
IN
3.6V
IN
3.1V
IN
LOAD CURRENT (mA)
EFFICIENCY (%)
100
95
90
85
80
75
70
0.1 10 100 1000
3458L TA04b
1
3.3V
IN
2.5V
IN
1.8V
IN
Li-Ion to 5V
OUT
Two Alkaline to 5V
OUT
LTC3458L
15
3458lfa
4.00 ±0.10
(2 SIDES)
3.00 ±0.10
(2 SIDES)
NOTE:
1. DRAWING PROPOSED TO BE A VARIATION OF VERSION
(WGED) IN JEDEC PACKAGE OUTLINE M0-229
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
4. EXPOSED PAD SHALL BE SOLDER PLATED
0.38 ± 0.10
BOTTOM VIEW—EXPOSED PAD
1.70 ± 0.10
(2 SIDES)
0.75 ±0.05
R = 0.115
TYP
R = 0.20
TYP
0.25 ± 0.05
3.30 ±0.10
(2 SIDES)
16
127
0.50
BSC
PIN 1
NOTCH
PIN 1
TOP MARK
0.200 REF
0.00 – 0.05
(UE12/DE12) DFN 0802
0.25 ± 0.05
3.30 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1.70 ±0.05
(2 SIDES)2.24 ±0.05
0.50
BSC
0.58 ±0.05
3.40 ±0.05
PACKAGE OUTLINE
DE/UE Package
12-Lead Plastic DFN (4mm × 3mm)
(Reference LTC DWG # 05-08-1695)
PACKAGE DESCRIPTIO
U
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.

LTC3458LEDE#TRPBF

Mfr. #:
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.7A, 1.5MHz Synch Boost Converter in DFN
Lifecycle:
New from this manufacturer.
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