LTC3404EMS8 Linear Technology, LTC3404EMS8 Datasheet

IC REG STP-DWN SYNC HI-EFF 8MSOP

LTC3404EMS8

Manufacturer Part Number
LTC3404EMS8
Description
IC REG STP-DWN SYNC HI-EFF 8MSOP
Manufacturer
Linear Technology
Type
Step-Down (Buck)r
Datasheet

Specifications of LTC3404EMS8

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.8 ~ 6 V
Current - Output
600mA
Frequency - Switching
1.4MHz
Voltage - Input
2.65 ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC3404EMS8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC3404EMS8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC3404EMS8#PBF
Manufacturer:
LT
Quantity:
2 293
Part Number:
LTC3404EMS8#TRPBF
Manufacturer:
LT
Quantity:
1 900
Part Number:
LTC3404EMS8#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TO 6V
APPLICATIO S
TYPICAL APPLICATIO
2.65V
V
IN
High Efficiency: Up to 95%
Very Low Quiescent Current: Only 10
During Operation
600mA Output Current at V
2.65V to 6V Input Voltage Range
1.4MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Synchronizable from 1MHz to 1.7MHz
Selectable Burst Mode
Pulse Skipping Mode
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1μA Supply Current
±2% Output Voltage Accuracy
Current Mode Control for Excellent Line and
Load Transient Response
Overcurrent and Overtemperature Protected
Available in 8-Lead MSOP Package
Cellular Telephones
Wireless and DSL Modems
Personal Information Appliances
Portable Instruments
Distributed Power Systems
Battery-Powered Equipment
***
**
*
TOKO D52LC A914BYW-4R7M
TAIYO-YUDEN CERAMIC JMK325BJ226MM
TAIYO-YUDEN CERAMIC LMK325BJ106MN
V
OUT
CONNECTED TO V
10μF***
CER
47pF
High Efficiency Step-Down Converter
7
6
1
2
U
SYNC
V
RUN
I
TH
IN
IN
FOR 2.65V < V
LTC3404
GND
®
4
Operation or
V
SW
FB
IN
5
3
IN
= 3.3V
< 3.3V
U
280k
4.7μH*
20pF
887k
μ
A
22μF**
CER
3404 TA01
V
3.3V
OUT
DESCRIPTIO
The LTC
nous buck regulator using a constant frequency, current
mode architecture. Supply current during operation is
only 10μA and drops to < 1μA in shutdown. The 2.65V to
6V input voltage range makes the LTC3404 ideally suited
for single Li-Ion battery-powered applications. 100% duty
cycle provides low dropout operation, extending battery
life in portable systems.
Switching frequency is internally set at 1.4MHz, allowing
the use of small surface mount inductors and capacitors.
For noise sensitive applications the LTC3404 can be
externally synchronized from 1MHz to 1.7MHz. Burst
Mode operation is inhibited during synchronization or
when the SYNC/MODE pin is pulled low, preventing low
frequency ripple from interfering with audio circuitry.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.8V feed-
back reference voltage. The LTC3404 is available in a
space saving 8-lead MSOP package.
For higher input voltage (11V abs max) applications, refer
to the LTC1877 data sheet.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Monolithic Synchronous
1.4MHz High Efficiency
®
3404 is a high efficiency monolithic synchro-
100
Step-Down Regulator
95
90
85
80
75
70
0.1
Efficiency vs Output Load Current
U
V
1
IN
= 3.6V
V
IN
LOAD (mA)
= 4.2V
Burst Mode OPERATION
V
L = 4.7μH
10
OUT
V
= 3.3V
IN
= 6V
100
3404 TA02
LTC3404
1000
3404fb
1

Related parts for LTC3404EMS8

LTC3404EMS8 Summary of contents

Page 1

... MSOP package. For higher input voltage (11V abs max) applications, refer to the LTC1877 data sheet. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. ...

Page 2

... PACKAGE/ORDER I FOR ATIO 0.3V) IN ORDER PART NUMBER LTC3404EMS8 LTC3404IMS8 LTC3404MPMS8 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. ...

Page 3

ELECTRICAL CHARACTERISTICS ● The denotes specifications which apply over –55°C to 125°C, otherwise specifications are 25° 3.6V unless otherwise specified. IN SYMBOL PARAMETER I Feedback Current VFB V Regulated Output Voltage FB ΔV Output Overvoltage ...

Page 4

LTC3404 W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Input Voltage 100mA OUT I = 10mA 90 OUT I = 300mA OUT I = 1mA OUT 0.1mA OUT Burst Mode OPERATION ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS R vs Input Voltage DS(ON) 0.9 0.8 SYNCHRONOUS 0.7 SWITCH 0.6 0.5 MAIN SWITCH 0.4 0.3 0.2 0 INPUT VOLTAGE (V) 3404 G09 DC ...

Page 6

LTC3404 W U TYPICAL PERFOR A CE CHARACTERISTICS Load Step Response V OUT 100mV/DIV I L 500mA/DIV I TH 1V/DIV 40μs/DIV 10μ 1. 22μF OUT OUT L = 4.7μH ...

Page 7

CTIO AL DIAGRA BURST Y = “0” ONLY WHEN CONSTANT “1” Y DEFEAT X PLL LPF 8 SYNC/MODE 7 VCO – 0.6V FREQ + 3 SHIFT REF + 0.8V EA – ...

Page 8

LTC3404 U OPERATIO When the converter is in Burst Mode operation, the peak current of the inductor is set to approximately 250mA, even though the voltage at the I TH value. The voltage at the I pin drops when the ...

Page 9

U OPERATIO Slope Compensation and Inductor Peak Current Slope compensation provides stability in constant fre- quency architectures by preventing subharmonic oscilla- tions at high duty cycles accomplished internally by adding a compensating ramp to the inductor current signal ...

Page 10

LTC3404 U U APPLICATIO S I FOR ATIO inductor ripple current and consequent output voltage ripple. Do not allow the core to saturate! Kool Mμ (from Magnetics, Inc very good, low loss core material for toroids with a ...

Page 11

U U APPLICATIO S I FOR ATIO Phase-Locked Loop and Frequency Synchronization The LTC3404 has an internal voltage-controlled oscillator and phase detector comprising a phase-locked loop. This allows the top MOSFET turn- locked to the rising edge of ...

Page 12

LTC3404 U U APPLICATIO S I FOR ATIO very low load currents can be misleading since the actual power lost consequence as illustrated in Figure 6. 1. The V quiescent current is due to two components: IN ...

Page 13

U U APPLICATIO S I FOR ATIO which is below the maximum junction temperature of 125°C. Note that at higher supply voltages, the junction tempera- ture is lower due to reduced switch resistance (R Checking Transient Response The regulator loop ...

Page 14

LTC3404 U U APPLICATIO S I FOR ATIO = 4.2V, ΔI Substituting V = 2.5V, V OUT 1.4MHz in equation (3) gives: ⎛ ⎞ − ⎟ = μ ...

Page 15

... MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... IN to 500mA, 1MHz Operation, OUT Pin, Constant Frequency 600mA, OUT Up to 5A, V from 2.2V to 10V OUT 10V 10μ 600mA OUT 10μ 600mA OUT IN LT 0607 REV B • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2000 V IN 2. 3.3V 3404fb ...

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