LT3667_15 Datasheet, PDF (34/34 Pages) Linear Technology – 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs

LT3667
TYPICAL APPLICATION
5V, 3.3V and 51mA Regulator
C6
C7
1µF
1µF
V_IN*
6V TO 40V
C1
2.2µF
IN2
IN1
UVLO1
EN
IN3
BOOST
SW
f = 600kHz
RT
R_T
174k
DA
FB1
LT3667
OUT2
BD
OUT3
51mA*
FB2
FB3
EN2/ILIM2 GND EN3/ILIM3
C2
0.22µF
L1
22µH
D1
DFLS160
C8
22pF
R1
931k
R2
249k
R3
499k
R4
158k
3.3V*
200mA
C5
10µF
C4
C9
R5
10µF
47nF 6.19k
3667 TA07
C1-C7: X5R OR X7R
L1: CDRH4D22/HP
*DERATE OUTPUT CURRENT AT HIGHER AMBIENT TEMPERATURES
AND INPUT VOLTAGES TO MAINTAIN JUNCTION TEMPERATURE
BELOW THE ABSOLUTE MAXIMUM
5V
C3 ^400mA
22µF
RELATED PARTS
PART NUMBER
LT3500
LT1939
LT3694
LT3507/LT3507A
LT3970
LT3502/LT3502A
DESCRIPTION
COMMENTS
36V (40V_MAX), 2A (I_OUT), 2.2MHz Step-Down Switching Regulator V_IN: 3V to 36V, V_OUT(MIN) = 0.8V, I_Q = 2.5mA, I_SD < 12µA,
with LDO Controller
3mm × 3mm DFN-10, MSOP-16E
25V, 2A (I_OUT), 2.2MHz Step-Down Switching Regulator with LDO V_IN: 3V to 25V, V_OUT(MIN) = 0.8V, I_Q = 2.5mA, I_SD < 12µA,
Controller
3mm × 3mm DFN-10, MSOP-16E
36V (70V_MAX), 2.6A (I_OUT), 2.5MHz Step-Down Switching
Regulator with Dual LDO Controller
V_IN: 4V to 36V, V_OUT(MIN) = 0.8V, I_Q = 1mA, I_SD < 1µA,
4mm × 5mm QFN-28, TSSOP-20E
36V, 2.5MHz, Triple (2.4A + 1.5A + 1.5A (I_OUT) with LDO
Controller High Efficiency Step-Down DC/DC Converter
V_IN: 4V to 36V, V_OUT(MIN) = 0.8V, I_Q = 7mA, I_SD = 1µA,
5mm × 7mm QFN-38
40V, 350mA (I_OUT), 2.2MHz Step-Down Switching Regulator with
I_Q = 2.5µA
40V, 500mA (I_OUT), 1.1MHz/2.2MHz Step-Down Switching
Regulator
V_IN: 4.2V to 40V, V_OUT(MIN) = 1.2V, I_Q = 2.5µA, I_SD < 1µA,
3mm × 2mm DFN, MSOP-10
V_IN: 3V to 40V, V_OUT(MIN) = 0.8V, I_Q = 1.5mA, I_SD < 1µA,
2mm × 2mm DFN-8, MSOP-10E
34 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_F3_or5_m-7_o4_r1_e 7_{information www.linear.com/LT3667}
[phone] ^● FAX: [phone] ^● www.linear.com/LT3667
3667fb
LT 1114 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2014