LTC3770_15 Datasheet, PDF (24/24 Pages) Linear Technology – Fast No RSENSE Step-Down Synchronous Controller with Margining, Tracking and PLL

LTC3770
TYPICAL APPLICATION
Typical Application 2.5V/10A Synchronized at 450kHz
R_PG
100k
PGOOD
RUN
R4
39k
R3
11k
C_F
220pF
FCB
R7
47k
R_RUN
R8
51k
51k
32 31 30 29 28 27 26 25
PGOOD V_ON RUN FCB Z0 BOOST TG SW
R2
95.3k
R1
30.1k
1 _VRNG
SENSE+ ²⁴
2 _VFB
SENSE– ²³
3
I_TH
PGND ²²
4
SGND
5
R_C
MARGIN1
MARGIN1
10k
6
MARGIN0
MARGIN0
LTC3770EUH
BG ²¹
DRV_CC ²⁰
INTV_CC ¹⁹
CC2
7 _ION
Z2 ¹⁸
100pF
CC1
8 _VREFIN
R_ON
75k
Z1 ¹⁷
1000pF
R5 ^{VREFOUT MPGM TRACK/SS PLLFLTR PLLIN VIN VINSNS ZVIN}
10k
9
10
11
12
13 14 15 16
R_PL
PLLIN
10k
0.1μF
R6
C_SS
C_PL
82k
0.1μF 0.01μF
C_P
1000pF
CV_IN
0.01μF
1000pF
RV_IN
10Ω
C_IN: TDK C4532X5R1H685M
C_OUT: PANASONIC EEFUE0G181R
L1: BI TECH 1.8μH HM65-H1R8-TB
M1, M2: PHILIPS PH3230
M1
PH3230
V_IN
5V TO 28V
CB
0.22μF
L1
1.8μH
V_OUT
2.5V
10A
DB
D1
CMDSH-3 B340A
M2
PH3230
INTV_CC
CV_CC
4.7μF
+
C_OUT
180μF
4V
x2
C_OUT3
22μF
X5R
x2
C_IN
10μF
50V
x3
3770 TA02b
RELATED PARTS
PART NUMBER
LTC1622
LTC1625/LTC1775
LTC1628/LTC3728
DESCRIPTION
550kHz Step-Down Controller
No R_SENSE Current Mode Synchronous Step-Down Controller
Dual, 2-Phase Synchronous Step-Down Controller
LTC1735
High Efficiency, Synchronous Step-Down Controller
LTC1736
LTC1772
LTC1773
High Efficiency, Synchronous Step-Down Controller with 5-Bit VID
SOT-23 Step-Down Controller
Synchronous Step-Down Controller
LTC1778
LTC1876
Wide Range, No R_SENSE Synchronous Step-Down Controller
2-Phase, Dual Synchronous Step-Down Controller with
Step-Up Regulator
LTC3708
Dual, 2-Phase, No R_SENSE Synchronous Step-Down Controller with
Output Tracking
LTC3713
LTC3731
Low V_IN High Current Synchronous Step-Down Controller
3-Phase Synchronous Step-Down Controller
LTC3778
Low V_OUT, No R_SENSE Synchronous Step-Down Controller
Burst Mode is a trademark of Linear Technology Corporation.
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_IN ≤ 36V
Burst Mode^® Operation; 16-Pin Narrow SSOP;
3.5V ≤ V_IN ≤ 36V
Mobile VID; 0.925V ≤ V_OUT ≤ 2V; 3.5V ≤ V_IN ≤ 36V
Current Mode; 550kHz; Very Small Solution Size
Up to 95% Efficiency, 550kHz, 2.65V ≤ V_IN ≤ 8.5V,
0.8V ≤ V_OUT ≤ V_IN, Synchronizable to 750kHz
GN16-Pin, 0.8V_FB Reference
3.5V ≤ V_IN ≤ 36V, Power Good Output, 300kHz Operation
Fast Transient Response Reduces C_OUT; 4V ≤ V_IN ≤ 36V,
0.6V ≤ V_OUT ≤ 6V; 2-Phase Operation Reduces C_IN
1.5V ≤ V_IN ≤ 36V, 0.8V ≤ V_OUT ≤ (0.9)V_IN, I_OUT Up to 20A
600kHz; Up to 60A Output
0.6V ≤ V_OUT ≤ (0.9)V_IN, 4V ≤ V_IN ≤ 36V, I_OUT Up to 20A
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
3770fc
LT 0209 REV C • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2004