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Linear Technology Electronic Components Datasheet

LTC3670 Datasheet

Monolithic 400mA Buck Regulator

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LTC3670
Monolithic 400mA Buck
Regulator with Dual 150mA
LDOs in 3mm × 2mm DFN
FEATURES
DESCRIPTION
n Triple Output Supply from a Single 2.5V to 5.5V Input
n 400mA Buck DC/DC Plus Dual 150mA LDOs in One IC
n Outputs Regulate Down to 0.8V
n ±2.5% Reference Accuracy
n Constant-Frequency 2.25MHz Operation
n Burst Mode® Operation for High Efficiency at Light
Loads; IQ = 70µA, All Outputs Enabled
n Independent Enable Pin for Each Output
n Current Mode Operation for Excellent Line and Load
Transient Response
n Internal Soft-Start for Each Output
n Tiny 12-Lead 3mm × 2mm × 0.75mm DFN Package
APPLICATIONS
n Handheld Products
n Portable Instruments
n Single-Cell Li-Ion/Li-Polymer Powered Devices
n DMB/DVB-H Multimedia Cell Phones
n Multivoltage Power for Digital Logic, I/O, FPGAs,
CPLDs, ASICs, SoCs, CPUs and RF Chipsets
The LTC®3670 is a triple power supply composed of a
400mA synchronous buck regulator and two 150mA low
dropout linear regulators (LDOs). The input supply range
of 2.5V to 5.5V is especially well-suited for single-cell
Lithium-Ion and Lithium-Ion/Polymer applications, and
for powering low voltage ASICs and SoCs from 3V, 3.3V
or 5V rails. Regulated output voltages are programmed
via external resistors. Each output has its own enable pin
for maximum flexibility.
The 400mA buck regulator features constant-frequency
2.25MHz operation, allowing small surface mount induc-
tors and capacitors to be used. Burst Mode operation
maintains high efficiency in light-load and no-load con-
ditions. Internal control-loop compensation simplifies
application design.
The LTC3670 is available in a 0.75mm profile, 3mm × 2mm
12-lead DFN package.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
Triple Power Supply with Independent Enables
VIN
3.3V TO 5.5V
2.2µF
DIGITAL
CONTROL
VIN
GND
SW
BUCKFB
LTC3670
ENBUCK
ENLDO1
ENLDO2
PGOOD
LDO1
LDO1_FB
4.7µH
232k
464k
806k
324k
10pF
LDO2
LDO2_FB
1.02M
324k
3670 TA01a
4.7µF
VOUT1
1.2V
400mA
VOUT2
2.8V
1µF 150mA
VOUT3
3.3V
1µF 150mA
Document Feedback
For more information www.analog.com
Demoboard
9.3mm
9.4mm
ACTIVE AREA
3670 TA01b
Rev A
1


Linear Technology Electronic Components Datasheet

LTC3670 Datasheet

Monolithic 400mA Buck Regulator

No Preview Available !

LTC3670
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
VIN, ENBUCK, ENLDO1, ENLDO2,
PGOOD..................................................... –0.3V to 6V
SW, BUCKFB, LDO1_FB, LDO2_FB,
LDO1, LDO2................................–0.3V to (VIN + 0.3V)
ISW........................................................................600mA
ILDO1, ILDO2...........................................................250mA
IPGOOD.....................................................................40mA
Junction Temperature............................................ 125°C
Operating Temperature Range.................. –40°C to 85°C
Storage Temperature Range.................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
SW 1
GND 2
ENLD01 3
ENLD02 4
ENBUCK 5
BUCKFB 6
12 VIN
11 LDO2
13
10 LDO1
9 LDO1_FB
8 LDO2_FB
7 PGOOD
DDB PACKAGE
12-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W, θJC = 13.5°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3670EDDB#PBF
LTC3670EDDB#TRPBF LDBY
12-Lead (3mm × 2mm) Plastic DFN –40°C to 85°C
Consult ADI Marketing for parts specified with wider operating temperature ranges.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
VIN
VUVLO
Input Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
VIN Rising
l 2.5
5.5
2.2 2.45
18 100
IQ VIN Quiescent Current, No Load
All Outputs Enabled
Buck Enabled Only
Buck Enabled Only, in Dropout
One LDO Enabled Only
Shutdown
(Note 4)
VBUCKFB = 0.9V
VBUCKFB = 0.9V
VBUCKFB = 0V
VENBUCK = VENLDO1 = VENLDO2 = 0V
70 110
38 60
700 1100
22 35
1
ENBUCK, ENLDO1, ENLDO2 Pin Thresholds
VIL Logic Low Voltage
VIH Logic High Voltage
l
l 1.2
0.4
ENBUCK, ENLDO1, ENLDO2 Pin Pull-Down
Resistance
4
RPGOOD
PGOOD Pin Logic Low Output Resistance
PGOOD Pin Hi-Z Leakage
VPGOOD = 6V
30
1
PGOOD Threshold on Feedback Voltages of
Enabled Regulators
(Note 5)
92
UNITS
V
V
mV
µA
µA
µA
µA
µA
V
V
Ω
µA
%
2 For more information www.analog.com
Rev A


Part Number LTC3670
Description Monolithic 400mA Buck Regulator
Maker Linear Technology
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LTC3670 Datasheet PDF






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