LTC1148 Datasheet, PDF (19/20 Pages) Linear Technology – High Efficiency Synchronous Step-Down Switching Regulators

U
TYPICAL APPLICATIO S
LTC1148
LTC1148-3.3/LTC1148-5
NDS9435A
V_IN
5.2V TO 14V
+
D1
MBRS140T3
C_IN
100µF
20V
C_T
390pF
NDS9410A
1 _{P-DRIVE N-DRIVE} 14
+ ^1µF
2 _NC
NC ¹³
LTC1148
3 _VIN
PGND ¹²
4
C_T
SGND ¹¹
*L
50µH
VN2222LL
0V: V_OUT = 3.3V
5V: V_OUT = 5V
5
10
INTV_CC SHUTDOWN
SHUTDOWN
R1A R1B
100pF ^{33k 43k}
10nF
6 _ITH
9
V_FB
1% 1%
C_OUT
220µF
C_C
3300pF
R_C
1k
7 _SENSE–
SENSE^{+ 8}
1000pF ^RSENSE**
R2 ₊ 10V
56k
×2
1%
OS-CON
0.05Ω
V_OUT
3.3V/2A
*COILTRONICS CTX50-2-MP
OR 5V/2A
LTC1148 • F17
**KRL SL-1-C1-0R050R
Figure 17. Logic Selectable 5V/1A or 3.3V/1A High Efficiency Regulator
U
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
0.300 – 0.325
(7.620 – 8.255)
0.130 ± 0.005
(3.302 ± 0.127)
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.045 – 0.065
(1.143 – 1.651)
0.770*
(19.558)
MAX
14 13 12 11 10 9
8
0.009 – 0.015
(0.229 – 0.381)
+0.035
0.325 _–0.015
( ) ^8.255
+0.889
–0.381
0.020
(0.508)
MIN
0.125
(3.175)
MIN
0.005
(0.125)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
1
2
3
4
5
6
7
N14 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
14 13 12 11 10
9
0° – 8° TYP
0.228 – 0.244
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
0.050
(1.270)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
(5.791 – 6.197)
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
5
6
8
0.150 – 0.157**
(3.810 – 3.988)
S14 0695
7
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.
19