LTC3539-2 Linear Technology, LTC3539-2 Datasheet

no-image

LTC3539-2

Manufacturer Part Number
LTC3539-2
Description
1MHz/2MHz Synchronous Step-Up DC/DC Converters
Manufacturer
Linear Technology
Datasheet
1.LTC3539-2.pdf (12 pages)
www.DataSheet4U.com
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells
Delivers 5V at 900mA From a Lithium-Polymer
Battery
V
1.5V to 5.25V V
Up to 94% Effi ciency
V
1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed
Frequency Operation
Output Disconnect
Selectable Burst Mode
10μA Quiescent Current
Logic Controlled Shutdown: <1μA
Requires Only 6 External Components
Low Profi le (2mm × 3mm × 0.75mm) DFN Package
Medical Instruments
Portable Bar Code Scanners
Noise Canceling Headphones
Portable GPS Navigation
Handheld PCs
1.8V TO 3.6V
IN
IN
Start-Up Voltage: 700mV
> V
V
OUT
IN
PWM
Operation
Wide V
OFF
BURST
2.2μF
ON
OUT
IN
, High Power 3.3V Regulator
Range
V
MODE
SHDN
®
IN
GND
or PWM Operation
LTC3539
4.7μH
PGND
V
OUT
SW
FB
1M
562k
22pF
3539 TA01a
22μF
V
3.3V
600mA
OUT
DESCRIPTION
The LTC
DC/DC converters with output disconnect. Synchronous
rectifi cation enables high effi ciency in the low profi le
2mm × 3mm DFN package. Battery life is extended with
a 700mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 1MHz (LTC3539) or 2MHz
(LTC3539-2) minimizes solution footprint by allowing the
use of tiny, low profi le inductors and ceramic capacitors.
The current mode PWM design is internally compensated,
reducing external parts count. The LTC3539/LTC3539-2
feature a pin-enabled automatic Burst Mode operation at
light load conditions. Anti-ring circuitry reduces EMI by
damping the inductor in discontinuous mode. Additional
features include a low shutdown current of under 1μA and
thermal overload protection.
The LTC3539/LTC3539-2 are offered in a 2mm × 3mm ×
0.75mm DFN package.
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
®
3539/LTC3539-2 are synchronous, 2A step-up
100
Synchronous Step-Up
90
80
70
60
50
40
30
20
10
0
0.1
V
V
IN
OUT
DC/DC Converters
LTC3539/LTC3539-2
Effi ciency and Power Loss vs
= 2.4V
= 3.3V
1
I
LOAD
Load Current
2A, 1MHz/2MHz
EFFICIENCY
AVERAGE (mA)
10
FREQUENCY = 1MHz
FREQUENCY = 2MHz
POWER LOSS
100
3539 TA01b
1000
1000
100
10
1
0.1
1
3539f

Related parts for LTC3539-2

Image
Part Number
Description
Manufacturer
Datasheet
Request R
LTC-3808
Part Number:
LTC-3808
Description:
(LTC-3000 Series) SEVEN-SEGMENT NUMERIC LED DISPLAY
Manufacturer:
LITE-ON Electronics
Datasheet:
LTC-3808.pdf (8 pages)
ltc-5623p-01j
Part Number:
ltc-5623p-01j
Description:
Led Display Seven-segment Single Digit Ltc-5623p-01j
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623P-01J.pdf (5 pages)
ltc-5623g-07
Part Number:
ltc-5623g-07
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623g-07
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623G-07.pdf (5 pages)
ltc-5623g-12
Part Number:
ltc-5623g-12
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623g-12
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623G-12.pdf (5 pages)
ltc-5623g-14
Part Number:
ltc-5623g-14
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623g-14
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623G-14.pdf (5 pages)
ltc-5623g-08
Part Number:
ltc-5623g-08
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623g-08
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623G-08.pdf (5 pages)
ltc-5623g-nb
Part Number:
ltc-5623g-nb
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623g-nb
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623G-NB.pdf (5 pages)
ltc-5623hr-05
Part Number:
ltc-5623hr-05
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623hr-05
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623HR-05.pdf (5 pages)
ltc-5623hr-01j
Part Number:
ltc-5623hr-01j
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623hr-01j
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623HR-01J.pdf (5 pages)
ltc-5623hr-09
Part Number:
ltc-5623hr-09
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623hr-09
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623HR-09.pdf (5 pages)
ltc-5623jg-j
Part Number:
ltc-5623jg-j
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623jg-j
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623JG-J.pdf (6 pages)
ltc-5623jg
Part Number:
ltc-5623jg
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623jg
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623JG.pdf (6 pages)
ltc-5623p-01
Part Number:
ltc-5623p-01
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623p-01
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623P-01.pdf (5 pages)
ltc-5623p-07
Part Number:
ltc-5623p-07
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623p-07
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623P-07.pdf (5 pages)
ltc-5623wc
Part Number:
ltc-5623wc
Description:
Led Display Seven-segment Quadruple Digits Ltc-5623wc
Manufacturer:
LiteOn Technology Corp.
Datasheet:
LTC-5623WC.pdf (5 pages)

LTC3539-2 Summary of contents

Page 1

... Additional features include a low shutdown current of under 1μA and thermal overload protection. The LTC3539/LTC3539-2 are offered in a 2mm × 3mm × 0.75mm DFN package. L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. ...

Page 2

... LTC3539/LTC3539-2 www.DataSheet4U.com ABSOLUTE MAXIMUM RATINGS (Note 1) V Voltage ................................................... –0. Voltage DC ............................................................ –0. Pulsed <100ns ......................................... –0. SHDN, FB, MODE Voltage ............................ –0. ............................................................. –0. OUT Operating Temperature (Notes 2, 5) ......... –40°C to 85°C Storage Temperature Range ................... –65°C to 125°C ...

Page 3

... Continuous operation above the specifi ed maximum operating junction temperature may result in device degradation or failure. Note 6: Failure to solder the exposed backside of the package to the PC board ground plane will result in a thermal resistance much higher than 60°C/W. LTC3539/LTC3539-2 = 1.2V 3.3V, unless otherwise noted. OUT MIN ...

Page 4

... LTC3539/LTC3539-2 www.DataSheet4U.com TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Load Current and 1.8V IN OUT 100 90 80 EFFICIENCY 0.1 1 LOAD CURRENT (mA) Effi ciency vs Load Current and OUT 100 90 80 EFFICIENCY POWER LOSS 2. 3. 4.2V ...

Page 5

... 3.3V AT 400mA OUT C = 22μF OUT 100 3539 G10 V 50mV/DIV AC-COUPLED LOAD CURRENT 200mA/DIV 3539 G14 500μs/DIV LTC3539/LTC3539 Temperature FB 0.50 0.25 0 –0.25 –0.50 –0.75 –1. –60 –40 – TEMPERATURE (°C) 3539 G08 Burst Mode SW and I ...

Page 6

... LTC3539/LTC3539-2 www.DataSheet4U.com PIN FUNCTIONS SW (Pin 1): Switch Pin. Connect inductor between SW and V . Keep PCB trace lengths as short and wide as pos- IN sible to reduce EMI. If the inductor current falls to zero, or SHDN is low, an internal anti-ring resistor is connected from minimize EMI. IN PGND (Pin 2), GND (Pin 3): Signal and Power Ground. ...

Page 7

... Internal soft-start and internal loop compensa- tion simplifi es the design process while minimizing the number of external components. The switching frequency of the LTC3539 is nominally 1MHz, while the LTC3539-2 switches at 2MHz. Operation of the LTC3539 and LTC3539-2 is identical in all other respects. ...

Page 8

... LTC3539/LTC3539-2 www.DataSheet4U.com OPERATION Zero Current Comparator: The zero current comparator monitors the inductor current to the output and shuts off the synchronous rectifi er once this current reduces to ap- proximately 40mA. This prevents the inductor current from reversing in polarity, improving effi ciency at light loads. ...

Page 9

... The minimum inductance value is given by: L > > V operation IN OUT Where for the LTC3539 or 2.2 for the LTC3539-2 Ripple = allowable inductor current ripple (Amps peak-to-peak) V IN(MIN) V OUT(MAX) The inductor current ripple is typically set for 20% to 40% of the maximum inductor current. High frequency ferrite core inductor materials improve effi ...

Page 10

... OUT PHONE WEBSITE (803) 448-9411 www.avxcorp.com (714) 852-2001 www.murata.com (408) 573-4150 www.t-yuden.com (847) 803-6100 www.component.tdk.com Li-Ion Cell to 5V 2.2μ 4.5V 2.2μ LTC3539-2 V OUT PWM BURST MODE V OUT 3.3V 350mA 22pF 1M SHDN OFF ON FB 22μF x2 GND PGND 309k ...

Page 11

... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LTC3539/LTC3539-2 0.40 ± 0.10 TYP 5 8 1.35 ±0.10 1.65 ± ...

Page 12

... LTC3539/LTC3539-2 www.DataSheet4U.com RELATED PARTS PART NUMBER DESCRIPTION LTC3400/ 600mA I , 1.2MHz, Synchronous Step-Up DC/DC SW LTC3400B Converters LTC3401 3MHz, Synchronous Step-Up DC/DC Converter 97% Effi ciency V SW LTC3402 3MHz, Synchronous Step-Up DC/DC Converter 97% Effi ciency V SW LTC3421 3MHz, Synchronous Step-Up DC/DC Converter SW with Output Disconnect LTC3422 1 ...

Related keywords