LTM8042/LTM8042-1
28
80421fb
For more information www.linear.com/LTM8042
Buck-Boost Mode, Driving 5 White LEDs at 500mA with PWM Dimming
Buck Mode, Driving 4 White LEDs at 1A
Boost Operation, Driving 9 White LEDs at 100mA
TYPICAL APPLICATIONS
80421 TA03
LTM8042
Si2319DS
UP TO 16.3V
RT GND CTL
2.2µF
7.32k
19.6k
f
SW
= 850kHz
F
V
CC
RUN
PWM
TGEN
SYNC
SS
V
IN
7V TO 17.5V
LED
+
TG
BSTOUT/BKIN
BSTIN/BKLED
F
500mA
80421 TA04
LTM8042
RT GND CTL
4.7µF
15.8k
f
SW
= 1MHz
2.2µF
UP TO 13.9V
V
CC
RUN
PWM
SYNC
TGEN
SS
V
IN
19V TO 30V
LED
+
TG
BSTOUT/BKIN
BSTIN/BKLED
F
1A
80421 TA05
LTM8042-1
RT GND
Si2319DS
CTL
V
CC
RUN
BSTIN/BKLED
PWM
TGEN
SYNC
SS
V
IN
6V TO 22V
LED
+
TG
BSTOUT/BKIN
3.4k
2.2µF
2.2µF
24.9k
f
SW
= 700kHz
100mA
UP TO 29V
LTM8042/LTM8042-1
29
80421fb
For more information www.linear.com/LTM8042
PACKAGE DESCRIPTION
PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME
A1 GND B1 GND C1 GND D1 GND E1 GND F1 RUN
A2 GND B2 GND C2 GND D2 GND E2 GND F2 GND
A3 GND B3 GND C3 GND D3 GND E3 GND F3 GND
A4 GND B4 GND C4 GND D4 GND E4 GND F4 GND
A5 GND B5 GND C5 BSTIN/BKLED– D5 BSTIN/BKLED– E5 GND F5 GND
A6 V
CC
B6 V
CC
C6 BSTIN/BKLED– D6 BSTIN/BKLED– E6 GND F6 GND
A7 V
CC
B7 V
CC
C7 BSTIN/BKLED– D7 BSTIN/BKLED– E7 GND F7 GND
PIN NAME PIN NAME PIN NAME PIN NAME PIN NAME
G1 SYNC H1 RT J1 SS K1 PWM L1 GND
G2 GND H2 GND J2 GND K2 GND L2 CTL
G3 GND H3 GND J3 GND K3 GND L3 TGEN
G4 GND H4 GND J4 GND K4 GND L4 GND
G5 BSTOUT/BKIN H5 BSTOUT/BKIN J5 BSTOUT/BKIN K5 LED+ L5 LED+
G6 BSTOUT/BKIN H6 BSTOUT/BKIN J6 BSTOUT/BKIN K6 LED+ L6 LED+
G7 BSTOUT/BKIN H7 BSTOUT/BKIN J7 TG K7 LED+ L7 LED+
Pin Assignment Table
(Arranged by Pin Number)
PACKAGE PHOTOGRAPH
LTM8042/LTM8042-1
30
80421fb
For more information www.linear.com/LTM8042
PACKAGE DESCRIPTION
LGA Package
77-Lead (15mm × 9mm × 2.82mm)
(Reference LTC DWG # 05-08-1859 Rev Ø)
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994
2. ALL DIMENSIONS ARE IN MILLIMETERS
LAND DESIGNATION PER JESD MO-222, SPP-010
5. PRIMARY DATUM -Z- IS SEATING PLANE
6. THE TOTAL NUMBER OF PADS: 77
4
3
DETAILS OF PAD #1 IDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE ZONE INDICATED.
THE PAD #1 IDENTIFIER MAY BE EITHER A MOLD OR
MARKED FEATURE
SYMBOL
aaa
bbb
eee
TOLERANCE
0.15
0.10
0.05
2.72 – 2.92
DETAIL B
DETAIL B
SUBSTRATE
MOLD
CAP
0.27 – 0.37
2.45 – 2.55
// bbb Z
Z
15
BSC
PACKAGE TOP VIEW
9
BSC
4
PAD 1
CORNER
X
Y
aaa Z
aaa Z
DETAIL A
12.70
BSC
1.27
BSC
7.62
BSC
L
K
J
H
G
F
E
D
C
B
PACKAGE BOTTOM VIEW
3
PADS
SEE NOTES
A
1234567
DETAIL A
0.635 ±0.025 SQ. 76x
S
YXeee
SUGGESTED PCB LAYOUT
TOP VIEW
0.000
1.270
1.270
2.540
2.540
3.810
3.810
5.080
5.080
6.350
6.350
3.810
1.270
2.540
0.000
1.270
3.810
2.540
LGA 77 (1859) 0709 REV Ø
PAD 1
DIA (0.635)
0.9525
1.5875
0.9525
1.5875
PACKAGE IN TRAY LOADING ORIENTATION
LTMXXXXXX
µModule
TRAY PIN 1
BEVEL
COMPONENT
PIN “A1”
LGA Package
77-Lead (15mm × 9mm × 2.82mm)
(Reference LTC DWG # 05-08-1859 Rev Ø)

LTM8042IV-1#PBF

Mfr. #:
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 350mA Boost LED Drive uModule
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union