LTC3770 Datasheet, PDF (23/24 Pages) Linear Technology – Synchronous Controller with Margining, Tracking and PLL

LTC3770
PACKAGE DESCRIPTIO
UH Package
32-Lead Plastic QFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1693)
5.50 ±0.05
3.45 ±0.05
(4 SIDES)
0.70 ±0.05
5.00 ± 0.10
(4 SIDES)
PIN 1
TOP MARK
(NOTE 6)
0.75 ± 0.05
0.00 – 0.05
3.45 ± 0.10
(4-SIDES)
BOTTOM VIEW—EXPOSED PAD
0.23 TYP
R = 0.115
(4 SIDES)
TYP
31 32
0.40 ± 0.10
1
2
4.10 ±0.05
0.25 ± 0.05
0.50 BSC
RECOMMENDED SOLDER PAD LAYOUT
PACKAGE
OUTLINE
0.200 REF
NOTE:
1. DRAWING PROPOSED TO BE A JEDEC PACKAGE OUTLINE
M0-220 VARIATION WHHD-(X) (TO BE APPROVED)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
0.25 ± 0.05
0.50 BSC
(UH) QFN 0603
TYPICAL APPLICATIO
1.8V/5A at 450kHz with Tracking
PGOOD
RUN
C_F
220pF
TRACK/SS
R_PG
100k
FCB
R7
47k
32 31 30 29 28 27 26 25
R8
PGOOD V_ON RUN FCB Z0 BOOST TG SW
R_RUN ^51k
51k
1 _VRNG
2
V_FB
SENSE+ ²⁴
23
SENSE–
3
I_TH
PGND ²²
R_C
R2 10k
60.4k
4
SGND
5
MARGIN1
MARGIN1
6
MARGIN0
MARGIN0
LTC3770EUH
BG ²¹
DRV_CC ²⁰
INTV_CC ¹⁹
CC2
7 _ION
18
Z2
R1
30.1k
100pF
CC1
R_ON ^{8 V}REFIN
75k
Z1 ¹⁷
1000pF
R5
V_REFOUT MPGM TRACK/SS PLLFLTR PLLIN V_IN V_INSNS ZV_IN
10k
9
10
11
12
13 14 15 16
R6
V_CC
200k
5V
1000pF
L1: BI TECH 1.8µH HM65-H1R8-TB
M1, M2: PHILIPS PH3230
C_IN: TDK C4532X5R1H685M
C_OUT: PANASONIC EEFUE0G181R
M1
PH3230
V_IN
4V TO 28V
CB
0.22µF
L1
1.8µH
DB
D1
CMDSH-3 B340A
V_OUT
1.8V
5A
M2
PH3230
INTV_CC
+
CV_CC
10µF
+ _COUT
180µF
4V
x2
C_OUT3
22µF
X5R
x2
C_IN
6.8µF
50V
x3
3770 TA02a
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.
3770f
23