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LTC3401EMS#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC3401
3401fb
TYPICAL APPLICATION
U
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
1A, 3MHz Micropower
Synchronous Boost Converter
The LTC
®
3401 is a high efficiency, fixed frequency, step-
up DC/DC converter that operates from an input voltage
below 1V. The device includes a 0.16Ω N-channel MOSFET
switch and a 0.18Ω P-channel synchronous rectifier.
Switching frequencies up to 3MHz are programmed with
an external timing resistor and the oscillator can be
synchronized to an external clock. An external Schottky
diode is optional but will slightly improve efficiency.
Quiescent current is only 38μA in Burst Mode operation,
maximizing battery life in portable applications. Burst
Mode operation is user controlled and can be enabled by
driving the MODE/SYNC pin high. If the MODE/SYNC pin
has either a clock or is driven low, then fixed frequency
switching is enabled.
Other features include 1μA shutdown, antiringing control,
open-drain power good output, thermal shutdown and
current limit. The LTC3401 is available in the 10-lead
thermally enhanced MSOP package. Higher current appli-
cations should use the 2A rated LTC3402 synchronous
boost converter. Applications that require V
OUT
< 2.6V
should use the LTC3423.
All-Ceramic-Capacitor 2-Cell to 3.3V at 500mA Step-Up Converter
■
Pagers
■
Handheld Instruments
■
Cordless Phones
■
Wireless Handsets
■
GPS Receivers
■
Battery Backup
■
CCFL Backlights
■
Synchronous Rectification: Up to 97% Efficiency
■
1A Switch Current Rating
■
Fixed Frequency Operation Up to 3MHz
■
Wide Input Range: 0.5V to 5.5V (Operating)
■
Very Low Quiescent Current: 38μA (Burst Mode
®
Operation)
■
2.6V to 5.5V Adjustable Output Voltage
■
0.85V (Typ) Start-Up Voltage
■
No External Schottky Diode Required (V
OUT
< 4.3V)
■
Synchronizable Switching Frequency
■
Burst Mode Enable Control
■
Antiringing Control Reduces Switching Noise
■
PGOOD Output
■
OPTI-LOOP
®
Compensation
■
Very Low Shutdown Current: <1μA
■
Small 10-Pin MSOP Package
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
I
OUT
(mA)
0.1
0
EFFICIENCY (%)
10
30
40
50
100
70
3401 TA02
20
80
90
60
110
100
1000
Burst Mode
OPERATION
1MHz
FIXED
FREQUENCY
V
IN
= 2.4V WITH SCHOTTKY
Efficiency
3
10
2
6
1
3404 TA01
LTC3401
V
IN
SHDN
MODE/SYNC
PGOOD
R
t
SW
V
OUT
FB
V
C
GND
4
7
8
9
5
C3
470pF
C4
4.7pF
2
CELLS
C1
4.7μF
R5
82k
R
t
30.1k
R2
909k
R1
549k
V
OUT
3.3V
500mA
L1
4.7μH
C2
22μF
C1: TAIYO YUDEN JMK212BJ475MG
C2: TAIYO YUDEN JMK325BJ226MM
L1: SUMIDA CD43-4R7M
V
IN
= 1.8V to 3V
0 = FIXED FREQUENCY
1 = Burst Mode OPERATION
+
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
2
LTC3401
3401fb
(Note 1)
V
IN
, V
OUT
Voltages ...................................... –0.5V to 6V
SW Voltage ................................................. –0.5V to 6V
V
C
, R
t
Voltages ......................... –0.5V to (V
OUT
+ 0.3V)
PGOOD, SHDN, FB, MODE Voltages ........... –0.5V to 6V
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
T
JMAX
= 125°C
θ
JA
= 130°C/ W 1 LAYER BOARD
θ
JA
= 100°C/ W 4 LAYER BOARD
MS PART MARKING
ORDER PART
NUMBER
LTC3401EMS
LTPG
The ● denotes specifications that apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 1.2V, V
OUT
= 3.3V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Start-Up Voltage I
LOAD
< 1mA 0.85 1.0 V
Minimum Operating Voltage (Note 4) ● 0.5 V
Output Voltage Adjust Range ● 2.6 5.5 V
Feedback Voltage ● 1.22 1.25 1.28 V
Feedback Input Current V
FB
= 1.25V 1 50 nA
Quiescent Current—Burst Mode Operation V
C
= 0V, MODE/SYNC = 3.3V (Note 3) 38 65 μA
Quiescent Current—SHDN SHDN = 0V, Not Including Switch Leakage 0.1 1 μA
Quiescent Current—Active V
C
= 0V, MODE/SYNC = 0V, R
t
= 300k (Note 3) 440 800 μA
NMOS Switch Leakage 0.1 5 μA
PMOS Switch Leakage 0.1 10 μA
NMOS Switch On Resistance 0.16 Ω
PMOS Switch On Resistance 0.18 Ω
NMOS Current Limit ● 1 1.6 A
NMOS Burst Current Limit 0.66 A
Maximum Duty Cycle R
t
= 15k ● 80 85 %
Minimum Duty Cycle ● 0%
Frequency Accuracy R
t
= 15k ● 1.6 2 2.4 MHz
MODE/SYNC Input High 1.4 V
MODE/SYNC Input Low 0.4 V
MODE/SYNC Input Current V
MODE/SYNC
= 5.5V 0.01 1 μA
Error Amp Transconductance ΔI = – 5μA to 5μA, V
C
= V
FB
85 μmhos
PGOOD Threshold Referenced to Feedback Voltage – 6 – 9 – 12 %
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
1
2
3
4
5
R
t
MODE
V
IN
SW
GND
10
9
8
7
6
SHDN
V
C
FB
V
OUT
PGOOD
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
3
LTC3401
3401fb
The ● denotes specifications that apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 1.2V, V
OUT
= 3.3V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
PGOOD Low Voltage I
PGOOD
= 1mA 0.1 0.2 V
V
OUT
= 1V, I
PGOOD
= 20μA 0.1 0.4 V
PGOOD Leakage V
PGOOD
= 5.5V 0.01 1 μA
SHDN Input High V
SHDN
= V
IN
= V
OUT
1V
SHDN Input Low 0.4 V
SHDN Input Current V
SHDN
= 5.5V 0.01 1 μA
Thermal Shutdown 170 °C
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3401 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current is measured into V
OUT
since the supply current is
bootstrapped to the V
OUT
pin and in the application will reflect to the input
supply by (V
OUT
/V
IN
) • I/ Efficiency. The outputs are not switching.
Note 4: Once the output is started, the IC is not dependant upon the V
IN
supply.
Switching Waveform on SW Pin
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SW Pin and Inductor Current (I
C
)
in Discontinuous Mode. Ringing
Control Circuitry Eliminates High
Frequency Ringing Transient Response 5mA to 50mA
SW
1V/DIV
50ns/DIV
3401 G01
SW
1V/DIV
200ns/DIV
3401 G02
0V
0A
I
L
50mA/DIV
I
OUT
C
OUT
= 22μF 200μs/DIV 3401 G03
L = 3.3μH
f
OSC
= 1MHz
V
OUT
100mV/DIV
50mA
5mA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3401EMS#PBF

Mfr. #:
Buy LTC3401EMS#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1A, 3MHz uP Sync Boost Conv
Lifecycle:
New from this manufacturer.
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