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Linear Technology Electronic Components Datasheet

LTC3388IMSE-3 Datasheet

20V High Efficiency Nanopower Step-Down Regulator

No Preview Available !

FEATURES
nn 720nA Input IQ in Regulation (No Load), VIN = 4V
nn 820nA Input IQ in Regulation (No Load), VIN = 20V
nn 400nA Input IQ in UVLO
nn 2.7V to 20V Input Operating Range
nn Up to 50mA of Output Current
nn Pin Selectable Output Voltages:
nn 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1)
nn 2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3)
nn High Efficiency Hysteretic Synchronous
DC/DC Conversion
nn Standby Mode Disables Buck Switching
nn Available in 10-Lead MSE and 3mm × 3mm
DFN Packages
APPLICATIONS
nn Keep Alive Power for Portable Products
nn Industrial Control Supplies
nn Distributed Power Systems
nn Battery-Operated Devices
LTC3388-1/LTC3388-3
20V High Efficiency
Nanopower
Step-Down Regulator
DESCRIPTION
The LTC®3388-1/LTC3388-3 are high efficiency step-down
DC/DC converters with internal high side and synchronous
power switches that draw only 720nA typical DC supply cur-
rent at no load while maintaining output voltage regulation.
Capable of supplying 50mA of load current, the LTC3388-1/
LTC3388-3 also incorporate an accurate undervoltage
lockout (UVLO) feature to disable the converter and main-
tain a low quiescent current state when the input voltage
falls below 2.3V. In regulation, the LTC3388-1/LTC3388-3
enter a sleep state in which both input and output quies-
cent currents are minimal. The buck converter turns on
and off as needed to maintain regulation. An additional
standby mode disables buck switching while the output is
in regulation for short duration loads requiring low ripple.
Output voltages of 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1)
and 2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3) are pin selectable.
The LTC3388-1/LTC3388-3 can operate with VIN up to 20V
while the no load quiescent current remains below 1µA.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
50mA Step-Down Converter
2.7V TO 20V
2.2µF
25V
1µF
6V
4.7µF
6V
VIN
LTC3388-1/
LTC3388-3
CAP
SW
VIN2
VOUT
EN
PGOOD
STBY
D0, D1
GND
338813 TA01a
100µH
2 OUTPUT
VOLTAGE
SELECT
VOUT
47µF
6V
Efficiency vs Load Current
100
VOUT = 1.8V, L = 100µH
90
80
70
60
50
40
30
20
10
0
VIN = 3.0V
VIN = 10V
VIN = 20V
10µ 100µ 1m
LOAD CURRENT (A)
10m
338813 TA01b
For more information www.linear.com/LTC3388
338813fa
1


Linear Technology Electronic Components Datasheet

LTC3388IMSE-3 Datasheet

20V High Efficiency Nanopower Step-Down Regulator

No Preview Available !

LTC3388-1/LTC3388-3
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN.............................................................. –0.3V to 22V
D0, D1...............–0.3V to [Lesser of (VIN2 + 0.3V) or 6V]
CAP....................... [Higher of –0.3V or (VIN – 6V)] to VIN
VIN2, VOUT...........–0.3V to [Lesser of (VIN + 0.3V) or 6V]
EN, STBY...................................................... –0.3V to 6V
PGOOD.......................................................... –0.3V to 6V
ISW........................................................................210mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSE Only............................................................... 300°C
PIN CONFIGURATION
TOP VIEW
EN 1
STBY 2
CAP 3
VIN 4
SW 5
10 PGOOD
9 D0
11
GND
8 D1
7 VIN2
6 VOUT
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 7.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
EN 1
10 PGOOD
STBY 2
CAP 3
VIN 4
11
GND
9 D0
8 D1
7 VIN2
SW 5
6 VOUT
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3388EDD-1#PBF
LTC3388EDD-1#TRPBF LFWN
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3388IDD-1#PBF
LTC3388IDD-1#TRPBF LFWN
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3388EMSE-1#PBF
LTC3388EMSE-1#TRPBF LTFWM
10-Lead Plastic MSOP
–40°C to 125°C
LTC3388IMSE-1#PBF
LTC3388IMSE-1#TRPBF LTFWM
10-Lead Plastic MSOP
–40°C to 125°C
LTC3388EDD-3#PBF
LTC3388EDD-3#TRPBF LFWQ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3388IDD-3#PBF
LTC3388IDD-3#TRPBF LFWQ
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3388EMSE-3#PBF
LTC3388EMSE-3#TRPBF LTFWP
10-Lead Plastic MSOP
–40°C to 125°C
LTC3388IMSE-3#PBF
LTC3388IMSE-3#TRPBF LTFWP
10-Lead Plastic MSOP
–40°C to 125°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/
338813fa
2
For more information www.linear.com/LTC3388


Part Number LTC3388IMSE-3
Description 20V High Efficiency Nanopower Step-Down Regulator
Maker Linear
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