LT1940/LT1940L
20
1940fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2001
LT/TP 0204 1K REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIO
U
PART NUMBER DESCRIPTION COMMENTS
LT1765 25V, 2.75A (I
OUT
), 1.25MHz, V
IN
: 3V to 25V, V
OUT(MIN)
: 1.20V, I
Q
: 1mA, I
SD
: 15µA
High Efficiency Step-Down DC/DC Converter S8, TSSOP16E Package
LT1766 60V, 1.2A (I
OUT
), 200kHz, V
IN
: 5.5V to 60V, V
OUT(MIN)
: 1.2V, I
Q
: 2.5mA, I
SD
: 25µA
High Efficiency Step-Down DC/DC Converter TSSOP16/TSSOP16E Package
LT1767 25V, 1.2A (I
OUT
), 1.25MHz, V
IN
: 3V to 25V, V
OUT(MIN)
: 1.2V, I
Q
: 1mA, I
SD
: 6µA
High Efficiency Step-Down DC/DC Converter MS8, MS8E Package
LT1944 Dual Output 350mA I
SW
, Constant Off-Time, V
IN
: 1.2V to 15V, V
OUT(MAX)
: 34V, I
Q
: 20µA, I
SD
: <1µA,
High Efficiency Step-Up DC/DC Converter MS Package
LT1944-1 Dual Output 150mA I
SW
, Constant Off-Time, V
IN
: 1.2V to 15V, V
OUT(MAX)
: 34V, I
Q
: 20µA, I
SD
: <1µA,
High Efficiency Step-Up DC/DC Converter MS Package
LT1945 Dual Output, Pos/Neg, 350mA I
SW
, Constant Off-Time, V
IN
: 1.2V to 15V, V
OUT(MAX)
: ±34V, I
Q
: 20µA, I
SD
: <1µA,
High Efficiency Step-Up DC/DC Converter MS Package Package
LT1956 60V, 1.2A (I
OUT
), 500kHz, V
IN
: 5.5V to 60V, V
OUT(MIN)
: 1.2V, I
Q
: 2.5mA, I
SD
: 25µA
High Efficiency Step-Down DC/DC Converter TSSOP16/TSSOP16E Package
LTC3407 Dual 600mA, 1.5MHz, Synchronous Step-Down Regulator V
IN
: 2.5V to 5.5V, V
OUT(MIN)
: 0.6V, I
Q
: 40µA, MSE Package
LTC3411 1.25A (I
OUT
), 4MHz, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
: 0.8V, I
Q
: 60µA, I
SD
: <1µA
Synchronous Step-Down DC/DC Converter MS Package
LTC3412 2.5A (I
OUT
), 4MHz, V
IN
: 2.5V to 5.5V, V
OUT(MIN)
: 0.8V, I
Q
: 60µA, I
SD
: <1µA
Synchronous Step-Down DC/DC Converter TSSOP16E Package
LT3430 60V, 2.75A (I
OUT
), 200kHz, V
IN
: 5.5V to 60V, V
OUT(MIN)
: 1.20V, I
Q
: 2.5mA, I
SD
: 25µA
High Efficiency Step-Down DC/DC Converter TSSOP16E Package
LTC3701 Two Phase,Dual, 500kHz, Constant Frequency, V
IN
: 2.5V to 10V, V
OUT(MIN)
: 0.8V, I
Q
: 460µA, I
SD
: 9µA
Current Mode, High Efficiency Step-Down SSOP-16 Package
DC/DC Controller
Low Ripple, Low Profile 5V to 3.3V/2.4A Maximum Height = 1.4mm
V
IN
4.8V TO 7V
RUN/SS1
RUN/SS2
PG1
PG2
V
C1
V
C2
FB1
FB2
BOOST1
SW1
BOOST2
SW2
LT1940L
V
IN
GND
C1
20µF
C3
2.2µF
0.1µF
0.1µF
4.7k
16.5k
100k
L2
3.3µH
L1
3.3µH
OUT2
3.3V
2.4A
D2
D4A
D1
D3A
D4B
D3B
10k
1500pF
330pF
1nF
0.47µF
D1, D2: MICROSEMI UPS120
D3, D4: BAT-54S
L1, L2: COILCRAFT LPO1704-332M
PGOOD
1940 TA07
C1: 2X TAIYO YUDEN JMK212BJ106ML
C3: 2X TAIYO YUDEN EMK212BJ105MN
