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Linear Technology Electronic Components Datasheet

LTC3424EMS Datasheet

3MHz Micropower Synchronous Boost Converter

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LTC3423/LTC3424
FEATURES
s 1.5V to 5.5V Adjustable Output Voltage
s Synchronous Rectification: Up to 95% Efficiency
s 1A Switch Current (LTC3423) or
2A Switch Current (LTC3424)
s Fixed Frequency Operation Up to 3MHz
s Wide Input Range: 0.5V to 5.5V (Operating)
s Very Low Quiescent Current: 38µA (Burst Mode®
Operation)
s No External Schottky Diode Required
s Synchronizable Switching Frequency
s Burst Mode Enable Control
s OPTI-LOOP® Compensation
s Very Low Shutdown Current: < 1µA
s Small 10-Pin MSOP Package
U
APPLICATIO S
s Pagers
s Handheld Instruments
s Cordless Phones
s Wireless Handsets
s GPS Receivers
s Battery Backup
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
Low Output Voltage,
3MHz Micropower Synchronous
Boost Converters
DESCRIPTIO
The LTC®3423 and LTC3424 are high efficiency, fixed
frequency, step-up DC/DC converters that can regulate
output voltages as low as 1.5V from a single cell. An
applied voltage of at least 2.7V to the VDD pin is required
to power the internal control circuitry.
The devices include a 0.16N-channel MOSFET switch
and a 0.21P-channel synchronous rectifier. The LTC3423
is intended for applications requiring less than 0.75W of
output power and the LTC3424 for 1.5W or less. Switching
frequencies up to 3MHz are programmed with an external
timing resistor and the oscillator can be synchronized to
an external clock.
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 the operation is at
constant fixed frequency.
Other features include a 1µA shutdown, thermal shutdown
and current limit. The LTC3423 and LTC3424 are available
in the 10-lead MSOP package. For applications requiring
an output voltage greater than 2.6V, the LTC3401 and
LTC3402 are recommended without the need of a separate
voltage for the VDD pin.
TYPICAL APPLICATIO
1-Cell to 1.8V at 600mA Step-Up Converter
VDD
C1
2.2µF
VDD = 2.7V TO 5.5V
VIN = 0.9V TO 1.5V
L1
2.2µH
+
1
CELL
C2
10µF
LTC3424
6
4
VDD
SW
10
SHDN
7
VOUT
3
VIN
8
FB
2
9
MODE/SYNC VC
1
Rt
5
GND
Rt
30.1k
R1
110k
VOUT
1.8V
600mA
C4
470pF
RC
82k
R2
C5 249k
4.7pF
C3
44µF
(2× 22µF)
0 = FIXED FREQ
1 = Burst Mode OPERATION
C1: TAIYO YUDEN JMK212BJ225MG
C2: TAIYO YUDEN JMK212BJ106MM
C3: TAIYO YUDEN JMK325BJ226MM
L1: SUMIDA CD43-2R2M
3423/24 TA01
Efficiency
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 1.5V
Burst Mode
OPERATION
VIN = 1.2V
VIN = 0.9V
VDD = 3.3V
VOUT = 1.8V
WITH MBRM120T3 SCHOTTKY
1
10
100
OUTPUT CURRENT (mA)
1000
3223/24 TA02
34234f
1


Linear Technology Electronic Components Datasheet

LTC3424EMS Datasheet

3MHz Micropower Synchronous Boost Converter

No Preview Available !

LTC3423/LTC3424
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, VOUT, VDD Voltages .............................. – 0.5V to 6V
SW Voltage ................................................. – 0.5V to 6V
VC, Rt Voltages ......................... – 0.5V to (VOUT + 0.3V)
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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
Rt 1
MODE 2
VIN 3
SW 4
GND 5
10 SHDN
9 VC
8 FB
7 VOUT
6 VDD
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C
θJA = 130°C/ W 1 LAYER BOARD
θJA = 100°C/ W 4 LAYER BOARD
ORDER PART
NUMBER
LTC3423EMS
LTC3424EMS
MS PART MARKING
LTQM
LTQN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 1.2V, VDD = 3.3V, VOUT = 1.8V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
VDD Input Voltage Range
VIN Operating Voltage Range
Output Voltage Adjust Range
(Note 4)
q 2.7
5.5
q 0.5
5.5
q 1.5
5.5
Feedback Voltage
q 1.22 1.25 1.28
Feedback Input Current
Quiescent Current—Burst Mode Operation
Quiescent Current—SHDN
VFB = 1.25V
VC = 0V, MODE/SYNC = 3.3V (Note 3)
SHDN = 0V, Not Including Switch Leakage
1
50
38
65
0.1
1
Quiescent Current—Active
NMOS Switch Leakage
VC = 0V, MODE/SYNC = 0V, Rt = 300k (Note 3)
440 800
0.1
5
PMOS Switch Leakage
0.1
10
NMOS Switch On Resistance
0.16
PMOS Switch On Resistance
0.21
NMOS Current Limit
LTC3423
LTC3424
q1
1.6
q2
2.8
Maximum Duty Cycle
Minimum Duty Cycle
Rt = 15k
q 80
85
q
0
Frequency Accuracy
MODE/SYNC Input High
Rt = 15k
q 1.6
2
2.4
1.4
MODE/SYNC Input Low
0.4
MODE/SYNC Input Current
Error Amp Transconductance
VMODE/SYNC = 5.5V
I = – 5µA to 5µA, VC = VFB
0.01
1
85
UNITS
V
V
V
V
nA
µA
µA
µA
µA
µA
A
A
%
%
MHz
V
V
µA
µmhos
34234f
2


Part Number LTC3424EMS
Description 3MHz Micropower Synchronous Boost Converter
Maker Linear
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