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Linear Technology Electronic Components Datasheet

LTC3400ES6 Datasheet

Micropower Synchronous Boost Converter

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LTC3400/LTC3400B
600mA, 1.2MHz Micropower
Synchronous Boost Converter
in ThinSOT
FEATURES
s Up to 92% Efficiency
s Generates 3.3V at 100mA from a Single AA Cell
s Low Start-Up Voltage: 0.85V
s 1.2MHz Fixed Frequency Switching
s Internal Synchronous Rectifier
s 2.5V to 5V Output Range
s Automatic Burst Mode® Operation (LTC3400)
s Continuous Switching at Light Loads (LTC3400B)
s Logic Controlled Shutdown (< 1µA)
s Antiringing Control Minimizes EMI
s Tiny External Components
s Low Profile (1mm) SOT-23 Package
U
APPLICATIO S
s Pagers
s MP3 Players
s Digital Cameras
s LCD Bias Supplies
s Handheld Instruments
s Wireless Handsets
s GPS Receivers
DESCRIPTIO
The LTC®3400/LTC3400B are synchronous, fixed fre-
quency, step-up DC/DC converters delivering high effi-
ciency in a 6-lead ThinSOT™ package. Capable of supplying
3.3V at 100mA from a single AA cell input, the devices
contain an internal NMOS switch and PMOS synchronous
rectifier.
A switching frequency of 1.2MHz minimizes solution
footprint by allowing the use of tiny, low profile inductors
and ceramic capacitors. The current mode PWM design is
internally compensated, reducing external parts count.
The LTC3400 features automatic shifting to power saving
Burst Mode operation at light loads, while the LTC3400B
features continuous switching at light loads. Antiringing
control circuitry reduces EMI concerns by damping the
inductor in discontinuous mode, and the devices feature
low shutdown current of under 1µA.
Both devices are available in the low profile (1mm)
SOT-23 package.
, LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
+ SINGLE
AA CELL
L1
4.7µH
C1
4.7µF
1
SW
6
5
VIN VOUT
OFF ON
LTC3400
4
3
SHDN FB
GND
2
C1, C2: TAIYO-YUDEN X5R EMK316BJ475ML
L1: COILCRAFT DO160C-472
R1
1.02M
1%
R2
604k
1%
VOUT
3.3V
100mA
C2
4.7µF
3400 F01
Figure 1. Single Cell to 3.3V Synchronous Boost Converter
Efficiency
100
VIN = 2.4V
90
80
VIN = 1.5V
70
60
50
FIGURE 1 CIRCUIT
WITH OPTIONAL SCHOTTKY DIODE
(SEE APPLICATIONS INFORMATION)
40
0.1
1
10
100
LOAD CURRENT (mA)
1000
3400 F01a
3400fa
1


Linear Technology Electronic Components Datasheet

LTC3400ES6 Datasheet

Micropower Synchronous Boost Converter

No Preview Available !

LTC3400/LTC3400B
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage ................................................. – 0.3V to 6V
SW Voltage ................................................. – 0.3V to 6V
SHDN, FB Voltage ....................................... – 0.3V to 6V
VOUT ........................................................... – 0.3V to 6V
Operating Temperature Range (Note 2) .. – 30°C to 85°C
Storage Temperature Range ................... – 65°C to 125°
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SW 1
GND 2
FB 3
6 VIN
5 VOUT
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJC = 102°C/W
ORDER PART
NUMBER
LTC3400ES6
LTC3400BES6
S6 PART MARKING
LTWK
LTUN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Start-Up Voltage
Minimum Operating Voltage
Output Voltage Adjust Range
ILOAD = 1mA
SHDN = VIN (Note 4)
0.85
1
V
0.5 0.65
V
2.5
5
V
Feedback Voltage
q 1.192 1.23 1.268
V
Feedback Input Current
Quiescent Current (Burst Mode Operation)
Quiescent Current (Shutdown)
Quiescent Current (Active)
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch On Resistance
PMOS Switch On Resistance
NMOS Current Limit
VFB = 1.25V (Note 3)
VFB = 1.4V (Note 5), LTC3400 Only
VSHDN = 0V, Not Including Switch Leakage
Measured On VOUT
VSW = 5V
VSW = 0V
VOUT = 3.3V
VOUT = 5V
VOUT = 3.3V
VOUT = 5V
1
nA
19
30
µA
0.01
1
µA
300
500
µA
0.1
5
µA
0.1
5
µA
0.35
0.20
0.45
0.30
600
850
mA
Burst Mode Operation Current Threshold
LTC3400 Only (Note 3)
3
mA
Current Limit Delay to Output
(Note 3)
40
ns
Max Duty Cycle
Switching Frequency
VFB = 1.15V
q 80
87
%
0.95 1.2
1.5
MHz
q 0.85
1.2
1.5
MHz
SHDN Input High
1
V
SHDN Input Low
0.35
V
SHDN Input Current
VSHDN = 5.5V
0.01
1
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3400E/LTC3400BE are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the – 30°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Minimum VIN operation after start-up is only limited by the
battery’s ability to provide the necessary power as it enters a deeply
discharged state.
Note 5: Burst Mode operation IQ is measured at VOUT. Multiply this value
by VOUT/VIN to get the equivalent input (battery) current.
3400fa
2


Part Number LTC3400ES6
Description Micropower Synchronous Boost Converter
Maker Linear
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