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LT3667HMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
LT3667
1
3667fb
For more information www.linear.com/LT3667
TYPICAL APPLICATION
FEATURES DESCRIPTION
40V 400mA Step-Down
Switching Regulator with
Dual Fault Protected LDOs
The LT
®
3667 is a monolithic triple power supply composed
of a 400mA buck switching regulator and two 200mA low
dropout linear regulators (LDOs).
The buck regulator includes a high efficiency switch, a
boost diode, and the necessary oscillator, control and
logic circuitry. Current mode topology is used for fast
transient response and good loop stability. Low ripple
Burst Mode operation maintains high efficiency at low
output currents while keeping output ripple below 15mV
in a typical application.
Each LDO supplies 200mA of output current with a typical
dropout voltage of 340mV, and each LDO has an accurate
resistor programmable current limit.
Internal protection circuitry includes reverse-battery
protection, current limiting, thermal limiting and reverse
current protection.
The LT3667 is available in a thermally-enhanced 16-Lead
MSOP and a 24-Pin 3mm x 5mm QFN package with ex
-
posed pad for low thermal resistance.
No-Load Supply Current
APPLICATIONS
n
Triple Output Supply from a Single Input Requires
Only One Inductor
n
I
Q
= 50μA at 12V
IN
to 5V, 3.3V and 2.5V with No Load
n
Buck Regulator:
Low Ripple (<15mV
P-P
) Burst Mode Operation
®
400mA Output with Internal Power Switch
4.3V to 40V Input Operation Range (60V Max)
n
Dual Low Dropout Linear Regulators
200mA Outputs with Programmable Current Limits
1.6V to 45V Input Range
Fault Protected to ±45V
n
Adjustable 250kHz to 2.2MHz Switching Frequency
n
Synchronizable Between 300kHz and 2.2MHz
n
Programmable Undervoltage Lockout
n
Power Good Indicators
n
Available in a Thermally-Enhanced 16-Lead MSOP
and 24-Lead (3mm × 5mm) QFN Packages
n
Automotive Battery Regulation
n
Power for Portable Instrumentation
n
Industrial Supplies
n
Fault-Protected Sensor Supply
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
EN2/ILIM2 EN3/ILIM3
GND
IN1
LT3667
BOOST
SW
DA
FB1
IN2
BD
2.5V
100mA
IN3
OUT3
FB3
3667 TA01a
ON OFF EN
PG
RT
OUT2
FB2
UVLO1
4.7µF
0.22µF
22pF
22µH
931k
5V
200mA
3.3V
100mA
294k
340k
158k
499k
158k
174k
V
IN
6V TO 40V
TRANSIENT
TO 60V
22µF
4.7µF 2.2µF
INPUT VOLTAGE (V)
5
0
SUPPLY CURRENT (µA)
10
30
40
50
100
70
15
25
30
3667 TA01b
20
80
90
60
10
20
35
LT3667
2
3667fb
For more information www.linear.com/LT3667
ABSOLUTE MAXIMUM RATINGS
FB2, FB3 Voltage .....................................................±45V
OUT2, OUT3 Voltage ...............................................±45V
IN2, IN3 (QFN) Voltage ............................................±45V
OUT2 – IN2 Differential Voltage ..............................±45V
OUT3 – IN3/BD Differential Voltage (MSOP)...........±45V
OUT3 – IN3 Differential Voltage (QFN) ....................±45V
IN1, EN, UVLO1 (QFN) Voltage (Note 3) ....................60V
IN1 Reverse Voltage ............................................... –0.3V
EN Pin Current .......................................................–1mA
IN3/BD (MSOP) Voltage ............................................ 30V
BD (QFN) Voltage ......................................................30V
BOOST Pin Voltage ...................................................50V
BOOST Pin Above SW Pin ......................................... 30V
(Notes 1, 2)
1
2
3
4
5
6
7
8
SW
BOOST
EN
RT
IN3/BD
OUT3
FB3
FB1
16
15
14
13
12
11
10
9
DA
IN1
PG
EN3/ILIM3
EN2/ILIM2
IN2
OUT2
FB2
TOP VIEW
17
GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 40°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
24 23 22 21
9 10
TOP VIEW
25
GND
UDD PACKAGE
24-LEAD (3mm × 5mm) PLASTIC QFN
11 12
6
5
4
3
2
1
15
16
17
18
19
20
BOOST
SYNC
EN
RT
BD
IN3
OUT3
FB3
IN1
UVLO1
PG
EN3/ILIM3
EN2/ILIM2
IN2
OUT2
FB2
SW
DA
NC
NC
PG1
FB1
PG2
PG3
14
7
13
8
θ
JA
= 46°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
RT Voltage ..................................................................2V
FB1 Voltage ................................................................. 6V
EN2/ILIM2, EN3/ILIM3 Voltage ...................................4V
PG Voltage ................................................................30V
PG1, PG2, PG3 Voltage (QFN) ...................................30V
SYNC Voltage (QFN) ...................................................6V
Operating Junction Temperature Range (Notes 4, 5)
E-, I-Grades ....................................... −40°C to 125°C
H-Grades ........................................... −40°C to 150°C
Storage Temperature Range .................. −65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP Package Only ......................................... 300°C
LT3667
3
3667fb
For more information www.linear.com/LT3667
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3667EMSE#PBF LT3667EMSE#TRPBF 3667 16-Lead Plastic MSOP –40°C to 125°C
LT3667IMSE#PBF LT3667IMSE#TRPBF 3667 16-Lead Plastic MSOP –40°C to 125°C
LT3667HMSE#PBF LT3667HMSE#TRPBF 3667 16-Lead Plastic MSOP –40°C to 150°C
LT3667EUDD#PBF LT3667EUDD#TRPBF LGFH
24-Lead (3mm × 5mm) Plastic QFN
–40°C to 125°C
LT3667IUDD#PBF LT3667IUDD#TRPBF LGFH
24-Lead (3mm × 5mm) Plastic QFN
–40°C to 125°C
LT3667HUDD#PBF LT3667HUDD#TRPBF LGFH
24-Lead (3mm × 5mm) Plastic QFN
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping
container. Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
= 12V unless otherwise noted. (Note 4)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN1
Undervoltage Lockout (Note 6) V
IN2
= 0V, V
IN3
= 0V
l
4 4.3 V
V
IN1
Overvoltage Lockout
l
40 42 44 V
V
IN2
Undervoltage Lockout (Note 6) V
IN1
= 3.5V, V
IN3
= 0V
l
4 4.3 V
UVLO1 Threshold Voltage Pin Voltage Falling
l
0.95 1 1.05 V
UVLO1 Pin Hysteresis 75 mV
UVLO1 Pin Current V
UVLO1
= 1V 1 30 nA
Quiescent Current from IN1 V
EN
= 0.3V
V
EN
= 12V, V
IN2
= 0V, Not Switching
l
0.01
13
1
30
µA
µA
Quiescent Current from IN2 V
EN
= 0.3V
V
EN
= 12V, V
IN1
= 0V, V
IN2
= 5V
l
0.01
38
1
80
µA
µA
Quiescent Current from IN1 + IN2 V
EN
= 0.3V, V
IN2
= 5V
V
EN
= 12V, V
IN2
= 5V, Not Switching
l
0.01
40
1
90
µA
µA
Quiescent Current from IN3 V
EN
= 0.3V, V
IN3
= 5V
V
EN
= 12V, V
IN3
= 5V
l
0.01
25
1
60
µA
µA
EN Pin Current V
EN
= 12V 0.6 2 µA
EN Input Threshold 0.3 1.1 V
Power Good Pins PG (MSOP), PG1, PG2, PG3 (QFN)
Leakage Current V
PG
= 5V, V
PG1/2/3
= 5V 0.1 1 µA
Output Voltage Low I
PG
= 40µA, I
PG1/2/3
= 40µA
l
0.2 0.3 V
Threshold as % of V
FB
(FB1, FB2, FB3) Pin Voltage Falling
Pin Voltage Rising
88
108
90
110
92
112
%
%
PG1 Threshold Hysteresis Measured at FB1 Pin 30 mV
PG2/PG3 Threshold Hysteresis Measured at FB2/FB3 Pin 20 mV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

LT3667HMSE#PBF

Mfr. #:
Buy LT3667HMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs
Lifecycle:
New from this manufacturer.
Delivery:
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