LTC1778 Linear Technology, LTC1778 Datasheet - Page 24

• Manufacturer Part Number: LTC1778
• Description: Wide Operating Range/ No RSENSE Step-Down Controller
• Manufacturer: Linear Technology

RELATED PARTS
LTC1778/LTC1778-1
TYPICAL APPLICATIO
PART NUMBER
LTC1622
LTC1625/LTC1775
LTC1628-PG
LTC1628-SYNC
LTC1709-7
LTC1709-8
LTC1735
LTC1736
LTC1772
LTC1773
LTC1874
LTC1876
LTC3713
LTC3778
Burst Mode is a registered trademark of Linear Technology Corporation.
24
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone]
470pF
11.5k
C
R1
C1
24.9k
DESCRIPTION
550kHz Step-Down Controller
No R
Dual, 2-Phase Synchronous Step-Down Controller
Dual, 2-Phase Synchronous Step-Down Controller
High Efficiency, 2-Phase Synchronous Step-Down Controller
with 5-Bit VID
High Efficiency, 2-Phase Synchronous Step-Down Controller
High Efficiency, Synchronous Step-Down Controller
High Efficiency, Synchronous Step-Down Controller with 5-Bit VID
SOT-23 Step-Down Controller
Synchronous Step-Down Controller
Dual, Step-Down Controller
2-Phase, Dual Synchronous Step-Down Controller with
Step-Up Regulator
Low V
Low V
R2
C
C
L1: TOKO A921CY-1R0M
IN
OUT
: TAIYO YUDEN TMK432BJ106MM
SENSE
33k
: CORNELL DUBILIER ESRD121M04B
0.1 F
R
2200pF
IN
OUT
C
C
SS
100pF
High Current Synchronous Step-Down Controller
, No R
C2
C
Current Mode Synchronous Step-Down Controller
C2
SENSE
220k
100k
R
R
ON
PG
U
Synchronous Step-Down Controller
1
2
3
4
5
6
7
8
RUN/SS
PGOOD
V
FCB
I
SGND
I
V
TH
ON
RNG
FB
www.linear.com
LTC1778
Typical Application 2.5V/3A at 1.4MHz
EXTV
INTV
BOOST
PGND
SW
V
TG
BG
CC
CC
IN
16
15
14
13
12
11
10
9
C
0.22 F
CMDSH-3
B
C
4.7 F
C
0.1 F
1
RF
VCC
F
D
B
COMMENTS
8-Pin MSOP; Synchronizable; Soft-Start; Current Mode
97% Efficiency; No Sense Resistor; 16-Pin SSOP
Power Good Output; Minimum Input/Output Capacitors;
3.5V V
Synchronizable 150kHz to 300kHz
Up to 42A Output; 0.925V V
Up to 42A Output; VRM 8.4; 1.3V V
Burst Mode
3.5V V
Mobile VID; 0.925V V
Current Mode; 550kHz; Very Small Solution Size
Up to 95% Efficiency, 550kHz, 2.65V V
0.8V V
Current Mode; 550kHz; Small 16-Pin SSOP, V
3.5V V
1.5V V
0.6V V
M1
1/2 Si9802
M2
1/2 Si9802
IN
IN
OUT
IN
IN
OUT
L1, 1 H
®
36V
36V
36V, Power Good Output, 300kHz Operation
36V, 0.8V V
Operation; 16-Pin Narrow SSOP;
V
(0.9)V
IN
, Synchronizable to 750kHz
IN
, 4V V
OUT
LINEAR TECHNOLOGY CORPORATION 2001
+
OUT
LT/TP 0502 1.5K REV A • PRINTED IN USA
2V; 3.5V V
OUT
IN
C
10 F
25V
C
120 F
4V
1778 TA03
IN
OUT
(0.9)V
36V, I
2V
V
9V TO 18V
V
2.5V
3A
OUT
IN
OUT
IN
IN
, I
OUT
IN
OUT
3.5V
8.5V,
Up to 20A
IN
36V
Up to 20A
< 9.8V
1778fa