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PDF LTC3406-1.2 Data sheet ( Hoja de datos )
| Número de pieza | LTC3406-1.2 | |
| Descripción | 1.5MHz / 600mA Synchronous Step-Down Regulator in ThinSOT | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ High Efficiency: Up to 90%
■ Very Low Quiescent Current: Only 20µA
■ 600mA Output Current at VIN = 3V
■ 2.5V to 5.5V Input Voltage Range
■ 1.5MHz Constant Frequency Operation
■ No Schottky Diode Required
■ 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
LTC3406-1.2www.DataSheet4U.com
1.5MHz, 600mA
Synchronous Step-Down
Regulator in ThinSOT
DESCRIPTIO
The LTC®3406-1.2 is a high efficiency monolithic syn-
chronous buck regulator using a constant frequency,
current mode architecture. Supply current during opera-
tion with only 20µA drops <1µA in shutdown. The 2.5V to
5.5V input voltage range makes the LTC3406-1.2 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 operation 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
LTC3406-1.2 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
LTC3406-1.2
RUN VOUT
GND
2.2µH
340612 TA01a
COUT
10µF
CER
VOUT
1.2V
600mA
Efficiency and Power Loss
100
90 EFFICIENCY
1
80 0.1
70
60 0.01
50
POWER LOSS
40 0.001
30
20
10
0
0.1
VIN = 2.7V 0.0001
VIN = 3.6V
VIN = 4.2V 0.00001
1 10 100 1000
LOAD CURRENT (mA)
340612 TA01b
340612f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Load Step
Load Step
LTC3406-1.2www.DataSheet4U.com
VOUT
100mV/DIV
AC COUPLED
ILOAD
500mA/DIV
IL
500mA/DIV
20µs/DIV
VIN = 3.6V
ILOAD = 100mA TO 600mA
340612 G16
VOUT
100mV/DIV
AC COUPLED
ILOAD
500mA/DIV
IL
500mA/DIV
20µs/DIV
VIN = 3.6V
ILOAD = 200mA TO 600mA
340612 G17
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.
W
FU CTIO AL DIAGRA
SLOPE
COMP
OSC
OSC
VOUT
5
FREQ
SHIFT
+
60k 0.8V
FB – EA
120k
–
+
VIN –
RUN OVDET
1 0.8V REF 0.8V + ∆VOVL +
SHUTDOWN
OV
0.65V
–ICOM+P
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
IRCMP
4 VIN
5Ω
3 SW
2 GND
3406B12 BD
340612f
5
5 Page 
TYPICAL APPLICATIO S
LTC3406-1.2www.DataSheet4U.com
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
LTC3406-1.2
1
RUN
5
VOUT
2.2µH†
COUT1*
10µF
CER
VOUT
1.2V
GND
2
340612 TA02
*MURATA GRM219R60JI06KE19B
**AVX06036D475MAT
†FDK MIPW3226D2R2M
LTC3406-1.2 Efficiency
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1 10 100
LOAD (mA)
1000
340612 TA03
Load Step
VOUT
100mV/DIV
AC COUPLED
ILOAD
500mA/DIV
IL
500mA/DIV
20µs/DIV
VIN = 3.6V
ILOAD = 20mA TO 600mA
340612 TA04
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)
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 – 0.50 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
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.01 – 0.10
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.
340612f
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3406-1.2.PDF ] | |
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