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PDF LTC3406B-1.2 Data sheet ( Hoja de datos )
| Número de pieza | LTC3406B-1.2 | |
| Descripción | 600mA Synchronous Step-Down Regulator | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
■ High Efficiency: Up to 96%
■ 600mA Output Current at VIN = 3V
■ 2.5V to 5.5V Input Voltage Range
■ 1.5MHz Constant Frequency Operation
■ No Schottky Diode Required
■ Low Quiescent Current: 300µA
■ Shutdown Mode Draws < 1µA Supply Current
■ Current Mode Operation for Excellent Line and
Load Transient Response
■ Overtemperature Protected
■ Low Profile (1mm) ThinSOTTM Package
U
APPLICATIO S
■ Cellular Telephones
■ Personal Information Appliances
■ Wireless and DSL Modems
■ Digital Still Cameras
■ MP3 Players
■ Portable Instruments
LTC3406B-1.2
1.5MHz, 600mA
Synchronous Step-Down
Regulator in ThinSOT
DESCRIPTIO
The LTC®3406B-1.2 is a high efficiency monolithic syn-
chronous buck regulator using a constant frequency,
current mode architecture. Supply current with no load is
300µA dropping to <1µA in shutdown. The 2.5V to 5.5V
input voltage range makes the LTC3406B-1.2 ideally suited
for single Li-Ion battery-powered applications. 100% duty
cycle provides low dropout operation, extending battery
life in portable systems. PWM pulse skipping mode opera-
tion provides very low output ripple voltage for noise
sensitive applications.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. The
LTC3406B-1.2 is available in a low profile (1mm) ThinSOT
package.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. ThinSOT is a trademark of Linear
Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066,
6127815, 6498466, 6611131.
TYPICAL APPLICATIO
VIN
2.7V TO 5.5V
High Efficiency Step-Down Converter
CIN
4.7µF
CER
VIN SW
LTC3406B-1.2
RUN VOUT
GND
2.2µH
3406B12 TA01a
COUT
10µF
CER
VOUT
1.2V
600mA
DataSheet4 U .com
Efficiency and Power Loss
100 1
90
80 EFFICIENCY
70
0.1
60
50
40
30
20
10
0.1
POWER LOSS
0.01
0.001
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V 0.0001
1 10 100 1000
LOAD CURRENT (mA)
3406B12 TA01b
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LTC3406B-1.2
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Start-Up from Shutdown
RUN
2V/DIV
VOUT
1V/DIV
IL
500mA/DIV
Load Step
VOUT
100mV/DIV
AC COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
VIN = 3.6V
ILOAD = 600mA
50µs/DIV
3406B12 G14
25µs/DIV
VIN = 3.6V
ILOAD = 0mA TO 600mA
Load Step
VOUT
100mV/DIV
AC COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
3406B12 G15
25µs/DIV
VIN = 3.6V
ILOAD = 50mA TO 600mA
Load Step
VOUT
100mV/DIV
AC COUPLED
Load Step
VOUT
100mV/DIV
AC COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
25µs/DIV
VIN = 3.6V
ILOAD = 100mA TO 600mA
3406B12 G17
IL
500mA/DIV
ILOAD
500mA/DIV
25µs/DIV
VIN = 3.6V
ILOAD = 200mA TO 600mA
3406B12 G18
3406B12 G16
PI FU CTIO S
RUN (Pin 1): Run Control Input. Forcing this pin above
1.5V enables the part. Forcing this pin below 0.3V shuts
down the device. In shutdown, all functions are disabled
drawing <1µA supply current. Do not leave RUN floating.
GND (Pin 2): Ground Pin.
SW (Pin 3): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchro-
nous power MOSFET switches.
VIN (Pin 4): Main Supply Pin. Must be closely decoupled
to GND, Pin 2, with a 2.2µF or greater ceramic capacitor.
VOUT (Pin 5): Output Voltage Feedback Pin. An internal
resistive divider divides the output voltage down for com-
parison to the internal reference voltage.
DataSheet4 U .com
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TYPICAL APPLICATIO S
LTC3406B-1.2
Single Li-Ion 1.2V/600mA Regulator for Lowest Profile, ≤1mm High
VIN
2.7V TO 4.2V
CIN**
4.7µF
CER
4
VIN
3
SW
LTC3406B-1.2
1
RUN
5
VOUT
2.2µH†
COUT1*
10µF
CER
VOUT
1.2V
GND
2
3406B12 TA02
*MURATA GRM219R60JI06KE19B
**AVX06036D475MAT
†FDK MIPW3226D2R2M
Efficiency vs Output Current
100
90
80
70 VIN = 2.7V
60
50 VIN = 4.2V
40
30
20
10
0.1
VIN = 3.6V
1 10 100
OUTPUT CURRENT (mA)
1000
3406B12 TA03
Load Step
VOUT
100mV/DIV
AC COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
20µs/DIV
VIN = 3.6V
ILOAD = 0mA TO 600mA
3406B12 TA04
Load Step
VOUT
100mV/DIV
AC COUPLED
IL
500mA/DIV
ILOAD
500mA/DIV
20µs/DIV
VIN = 3.6V
ILOAD = 200mA TO 600mA
3406B12 TA05
PACKAGE DESCRIPTIO
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62 0.95
MAX REF
1.22 REF
2.90 BSC
(NOTE 4)
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
DataSheet4 U .com
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.20 BSC
DATUM ‘A’
0.09 – 0.20
(NOTE 3)
PIN ONE
0.95 BSC
0.80 – 0.90
1.00 MAX
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.01 – 0.10
0.30 – 0.50 REF
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
1.90 BSC
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
S5 TSOT-23 0302
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.
sn3406b12 3406b12fs
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3406B-1.2.PDF ] | |
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