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LTC3404IMS8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC3404
3404fb
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
■
High Efficiency: Up to 95%
■
Very Low Quiescent Current: Only 10
μ
A
During Operation
■
600mA Output Current at V
IN
= 3.3V
■
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
®
Operation or
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
The LTC
®
3404 is a high efficiency monolithic synchro-
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.
■
Cellular Telephones
■
Wireless and DSL Modems
■
Personal Information Appliances
■
Portable Instruments
■
Distributed Power Systems
■
Battery-Powered Equipment
High Efficiency Step-Down Converter
1.4MHz High Efficiency
Monolithic Synchronous
Step-Down Regulator
Efficiency vs Output Load Current
LOAD (mA)
80
75
EFFICIENCY (%)
85
90
95
100
0.1 10 100 1000
3404 TA02
70
1
V
IN
= 6V
V
IN
= 4.2V
V
IN
= 3.6V
Burst Mode OPERATION
V
OUT
= 3.3V
L = 4.7μH
22μF**
CER
7
6
1
2
5
3
4
SW
V
FB
LTC3404
GND
4.7μH*
10μF***
CER
47pF
V
OUT
†
3.3V
*
**
***
†
TOKO D52LC A914BYW-4R7M
TAIYO-YUDEN CERAMIC JMK325BJ226MM
TAIYO-YUDEN CERAMIC LMK325BJ106MN
V
OUT
CONNECTED TO V
IN
FOR 2.65V < V
IN
< 3.3V
887k
20pF
280k
3404 TA01
SYNC
V
IN
RUN
I
TH
V
IN
2.65V
TO 6V
, 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.
2
LTC3404
3404fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current (Note 4) ● 430 nA
V
FB
Regulated Output Voltage (Note 4) 0°C ≤ T
A
≤ 85°C 0.784 0.8 0.816 V
(Note 4) – 40°C ≤ T
A
≤ 85°C ● 0.74 0.8 0.84 V
ΔV
OVL
Output Overvoltage Lockout ΔV
OVL
= V
OVL
– V
FB
● 20 50 110 mV
ΔV
FB
Reference Voltage Line Regulation V
IN
= 2.65V to 6V (Note 4) 0.05 0.2 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop; V
ITH
= 0.9V to 1.2V ● 0.1 0.5 %
Measured in Servo Loop; V
ITH
= 1.6V to 1.2V ● – 0.1 – 0.5 %
V
IN
Input Voltage Range ● 2.65 6 V
I
Q
Input DC Bias Current (Note 5)
Pulse Skipping Mode 2.65V < V
IN
< 6V, V
SYNC/MODE
= 0V, I
OUT
= 0A 400 700 μA
Burst Mode Operation V
SYNC/MODE
= V
IN
, I
OUT
= 0A 10 15 μA
Shutdown V
RUN
= 0V, V
IN
= 6V 0 1 μA
f
OSC
Oscillator Frequency V
FB
= 0.8V ● 1.25 1.4 1.65 MHz
V
FB
= 0V 200 kHz
f
SYNC
SYNC Capture Range 1.0 1.7 MHz
I
PLL LPF
Phase Detector Output Current
Sinking Capability f
PLLIN
< f
OSC
● 6 20 40 μA
Sourcing Capability f
PLLIN
> f
OSC
● –6 –20 –40 μA
R
PFET
R
DS(ON)
of P-Channel MOSFET I
SW
= 100mA 0.5 0.7 Ω
R
NFET
R
DS(ON)
of N-Channel MOSFET I
SW
= –100mA 0.6 0.8 Ω
I
PK
Peak Inductor Current V
IN
= 3.3V, V
FB
= 0.7V, Duty Cycle < 35% 0.8 1.0 1.25 A
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 6V, V
IN
= 6V ±0.01 ±1 μA
V
SYNC/MODE
SYNC/MODE Threshold V
SYNC/MODE
Rising ● 0.3 1.0 1.5 V
I
SYNC/MODE
SYNC/MODE Leakage Current ±0.01 ±1 μA
V
RUN
RUN Threshold V
RUN
Rising ● 0.3 0.7 1.5 V
I
RUN
RUN Input Current ±0.01 ±1 μA
(Note 1)
Input Supply Voltage (V
IN
)...........................–0.3V to 7V
I
TH
, PLL LPF Voltage ................................–0.3V to 2.7V
RUN, V
FB
Voltages ...................................... – 0.3V to V
IN
SYNC/MODE Voltage .................................. – 0.3V to V
IN
SW Voltage (DC) .......................... –0.3V to (V
IN
+ 0.3V)
P-Channel MOSFET Source Current (DC) ........... 800mA
N-Channel MOSFET Sink Current (DC) ............... 800mA
Peak SW Sink and Source Current ........................ 1.5A
Operating Temperature Range (Note 2)
LTC3404E/LTC3404I ........................... –40°C to 85°C
LTC3404MP ...................................... –55°C to 125°C
Junction Temperature (Note 3)............................ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
The ● denotes specifications which apply over –40°C to 85°C, otherwise specifications are T
A
= 25°C.
V
IN
= 3.6V unless otherwise specified.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
1
2
3
4
8
7
6
5
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
PLL LPF
SYNC/MODE
V
IN
SW
RUN
I
TH
V
FB
GND
T
JMAX
= 125°C, θ
JA
= 125°C/W
ORDER PART NUMBER
MS8 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3404EMS8
LTC3404IMS8
LTC3404MPMS8
LTKR
LTCJR
LTCXG
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
LTC3404
3404fb
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 LTC3404E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3404I is guaranteed to meet
performance specifications over the –40°C to 85°C operating temperature
range. The LTC3404MP is guaranteed to meet performance specifications
over the –55°C to 125°C operating temperature range.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
T
J
= T
A
+ (P
D
)(150°C/W)
Note 4: The LTC3404 is tested in a feedback loop which servos V
FB
to the
balance point for the error amplifier (V
ITH
= 1.2V).
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current (Note 4) 4 30 nA
V
FB
Regulated Output Voltage (Note 4) 0°C ≤ T
A
≤ 125°C 0.784 0.8 0.816 V
(Note 4) – 55°C ≤ T
A
≤ 125°C 0.74 0.8 0.84 V
ΔV
OVL
Output Overvoltage Lockout ΔV
OVL
= V
OVL
– V
FB
20 50 110 mV
ΔV
FB
Reference Voltage Line Regulation V
IN
= 2.65V to 6V (Note 4) 0.05 0.2 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop; V
ITH
= 0.9V to 1.2V 0.1 1 %
Measured in Servo Loop; V
ITH
= 1.5V to 1.2V –0.1 –1 %
V
IN
Input Voltage Range 2.65 6 V
I
Q
Input DC Bias Current (Note 5)
Pulse Skipping Mode 2.65V < V
IN
< 6V, V
SYNC/MODE
= 0V, I
OUT
= 0A 400 700 μA
Burst Mode Operation V
SYNC/MODE
= V
IN
, I
OUT
= 0A 10 15 μA
Shutdown V
RUN
= 0V, V
IN
= 6V 0 1 μA
f
OSC
Oscillator Frequency V
FB
= 0.8V 1.25 1.4 1.65 MHz
V
FB
= 0V 200 kHz
f
SYNC
SYNC Capture Range 1.0 1.7 MHz
I
PLL LPF
Phase Detector Output Current
Sinking Capability f
PLLIN
< f
OSC
6 20 40 μA
Sourcing Capability f
PLLIN
> f
OSC
–6 –20 –40 μA
R
PFET
R
DS(ON)
of P-Channel MOSFET I
SW
= 100mA 0.7 Ω
R
NFET
R
DS(ON)
of N-Channel MOSFET I
SW
= –100mA 0.8 Ω
I
PK
Peak Inductor Current V
IN
= 3.3V, V
FB
= 0.7V, Duty Cycle < 35%, 0.4 1.0 1.1 A
T
A
= 125°C
V
IN
= 4V, V
FB
= 0.7V, Duty Cycle < 35%, 0.8 1.2 A
T
A
= 125°C
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 6V, V
IN
= 6V ±3 μA
V
SYNC/MODE
SYNC/MODE Threshold V
SYNC/MODE
Rising 0.3 1.5 V
I
SYNC/MODE
SYNC/MODE Leakage Current ±1 μA
V
RUN
RUN Threshold V
RUN
Rising 0.3 1.5 V
I
RUN
RUN Input Current ±1 μA
The ● denotes specifications which apply over –55°C to 125°C, otherwise specifications are T
A
= 25°C.
V
IN
= 3.6V unless otherwise specified.
ELECTRICAL CHARACTERISTICS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3404IMS8#TRPBF

Mfr. #:
Buy LTC3404IMS8#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.4MHz Hi Eff Mono Sync Buck Reg
Lifecycle:
New from this manufacturer.
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