LTC1874 Linear Technology, LTC1874 Datasheet - Page 12

• Manufacturer Part Number: LTC1874
• Description: Dual Constant Frequency Current Mode Step-Down DC/DC Controller
• Manufacturer: Linear Technology

PACKAGE DESCRIPTIO
TYPICAL APPLICATIO
LTC1874
RELATED PARTS
PART NUMBER
LTC1147 Series
LTC1622
LTC1624
LTC1625
LTC1626
LTC1628
LTC1735
LT1767
LTC1772
LTC1773
LTC1877/LTC1878
No R
12
C1, C2: SANYO POSCAP 6TPA47M
C
D1: 15MQ040N
D2: MBRM120
L1: BH-ELECTRONICS BH511-1012
L2: COILTRONICS UP2B-4R7
M1, M2: Si3443DV
R1, R2: DALE 0.25W
IN
: TAIYO YUDEN CERAMIC
EMK325BJ106MNT ( 2)
SENSE
2.5V TO 8.5V
is a trademark of Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
(0.178 – 0.249)
0.007 – 0.0098
* DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
V
IN
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
10 F
16V
C
IN
2
DESCRIPTION
High Efficiency Step-Down Switching Regulator Controllers
Synchronizable Low Input Voltage Current Mode Step-Down
DC/DC Controller
High Efficiency SO-8 N-Channel Switching Regulator Controller
No R
Low Voltage, High Efficiency Step-Down DC/DC Converter
Dual, 2-Phase Synchronous Step-Down Controller
Single, High Efficiency, Low Noise Synchronous Switching Controller
1.5A, 500kHz Step-Down Switching Regulators
Constant Frequency Current Mode Step-Down DC/DC Controller
Synchronous Step-Down Controller
Low Voltage, Monolithic Synchronous Step-Down Regulator
(0.406 – 1.270)
0.016 – 0.050
V
SENSE
OUT1
3.3V
80.6k
1A
249k
TM
Synchronous Step-Down Regulator
LTC1874 2.5V–8.5V Input to 3.3V/1A and 1.8V/1A Dual Converter
+
0 – 8 TYP
U
C1
47 F
0.015 0.004
(0.38 0.10)
2
L1
U
•
D1
16-Lead Plastic SSOP (Narrow 0.150)
Dimensions in inches (millimeters) unless otherwise noted.
M1
45
(0.203 – 0.305)
0.008 – 0.012
•
R1
0.03
L1A
(1.351 – 1.727)
0.053 – 0.068
(LTC DWG # 05-08-1641)
GN Package
220pF
10k
13
14
15
16
1
2
3
4
V
SENSE1
GND1
V
I
PGND1
PGATE1
PV
TH
IN1
FB1
0.0250
(0.635)
IN1
/RUN1
BSC
LTC1874
(0.102 – 0.249)
0.004 – 0.0098
–
I
SENSE2
TH
PGATE2
PGND2
/RUN2
GND2
PV
V
V
FB2
IN2
IN2
(5.817 – 6.198)
COMMENTS
100% Duty Cycle, 3.5V V
V
Burst Mode Operation Optional, 8-Lead MSOP
8-Pin N-Channel Drive, 3.5V V
97% Efficiency, No Sense Resistor; Up to 10A
Monolithic, Constant Off-Time, Low Voltage Range:
2.5V to 6V
Minimum C
High Efficiency 5V to 3.3V Conversion at up to 15A
High Frequency, Small Inductor, High Efficiency
V
V
Low Supply Voltage Range: 2.65V to 8V, I
–
0.229 – 0.244
IN
IN
IN
8
7
6
5
12
11
10
9
2V to 10V, I
2.5V to 9.8V, I
2.65V to 8.5V, I
220pF
10k
IN
16 15 14 13
1
and C
2 3 4
OUT
(4.801 – 4.978)
0.189 – 0.196*
OUT
OUT
Up to 4.5A,
OUT
LINEAR TECHNOLOGY CORPORATION 2000
12 11 10 9
Up to 4A, SOT-23 Package
5 6 7
, 3.5V V
up to 4A
1874f LT/TP 0201 4K • PRINTED IN USA
IN
M2
R2
0.082
D2
8
16V
4.7 H
IN
L2
IN
GN16 (SSOP) 1098
(3.810 – 3.988)
0.150 – 0.157**
36V
(0.229)
+
0.009
36V
REF
OUT
C2
47 F
6V
= 0.5A
100k
80.6k
1874 TA02
V
1.8V
1A
OUT2