ltc3770 Linear Technology Corporation, ltc3770 Datasheet - Page 24

• Manufacturer Part Number: ltc3770
• Description: Fast No Rsense Step-down Synchronous Controller With Margining, Tracking And Pll
• Manufacturer: Linear Technology Corporation

LTC3770
TYPICAL APPLICATIO
RELATED PARTS
PART NUMBER
LTC1622
LTC1625/LTC1775
LTC1628/LTC3728
LTC1735
LTC1736
LTC1772
LTC1773
LTC1778
LTC1876
LTC3708
LTC3713
LTC3731
LTC3778
Burst Mode is a registered trademark of Linear Technology Corporation.
24
220pF
R4
39k
R3
11k
C
PGOOD
F
RUN
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
R2
95.3k
R1
30.1k
R
51k
RUN
R
10k
100pF
C
CC1
1000pF
CC2
47k
51k
DESCRIPTION
550kHz Step-Down Controller
No R
Dual, 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
Wide Range, No R
2-Phase, Dual Synchronous Step-Down Controller with
Step-Up Regulator
Dual, 2-Phase, No R
Output Tracking
Low V
3-Phase Synchronous Step-Down Controller
Low V
R7
R8
●
MARGIN1
MARGIN0
SENSE
FAX: [phone]
IN
OUT
10k
R
75k
R5
High Current Synchronous Step-Down Controller
ON
, No R
R
100k
Current Mode Synchronous Step-Down Controller
PG
R6
82k
1
2
3
4
5
6
7
8
V
V
I
SGND
MARGIN1
MARGIN0
I
V
V
SENSE
TH
ON
RNG
FB
REFIN
REFOUT
0.1µF
C
SENSE
SS
9
SENSE
PGOOD V
U
Synchronous Step-Down Controller
MPGM TRACK/SS
Typical Application 2.5V/10A Synchronized at 450kHz
32
Synchronous Step-Down Controller
10
●
Synchronous Step-Down Controller with Fast Transient Response Reduces C
0.01µF
ON
www.linear.com
31
C
PL
RUN FCB
11
30
LTC3770EUH
FCB
R
10k
PLLFLTR PLLIN
PL
29
12
Z0 BOOST TG
C
1000pF
28
P
PLLIN
0.1µF
13
27
V
IN
14
26
V
INSNS
SW
15
25
SENSE+
SENSE–
INTV
DRV
CV
0.01µF
PGND
ZV
IN
BG
IN
CC
CC
Z2
Z1
16
24
23
22
21
20
19
18
17
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
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
GN16-Pin, 0.8V
3.5V ≤ V
0.6V ≤ V
1.5V ≤ V
600kHz; Up to 60A Output
0.6V ≤ V
RV
10Ω
1000pF
IN
IN
IN
OUT
IN
OUT
IN
OUT
≤ 36V
≤ 36V
≤ 36V, Power Good Output, 300kHz Operation
≤ 36V, 0.8V ≤ V
®
≤ V
≤ 6V; 2-Phase Operation Reduces C
≤ (0.9)V
L1: BI TECH 1.8µH HM65-H1R8-TB
M1, M2: PHILIPS PH3230
C
C
Operation; 16-Pin Narrow SSOP;
IN
OUT
: TDK C4532X5R1H685M
FB
IN
: PANASONIC EEFUE0G181R
, Synchronizable to 750kHz
Reference
CB
0.22µF
DB
CMDSH-3
CV
4.7µF
INTV
CC
IN
, 4V ≤ V
CC
OUT
© LINEAR TECHNOLOGY CORPORATION 2004
OUT
M1
PH3230
M2
PH3230
B340A
≤ 2V; 3.5V ≤ V
1.8µH
D1
LT/LWI 0606 REV B • PRINTED IN USA
L1
IN
≤ (0.9)V
≤ 36V, I
OUT
C
22µF
X5R
x2
; 4V ≤ V
IN
OUT3
IN
, I
OUT
+
IN
≤ 8.5V,
OUT
≤ 36V
Up to 20A
C
180µF
4V
x2
3770 TA02b
IN
V
2.5V
10A
Up to 20A
OUT
OUT
IN
≤ 36V,
C
10µF
50V
x3
V
5V TO 28V
IN
IN
3770fb
3770fb