Fiti TRI1461GB05RADJ Schematic [ru]
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A
fitipower integrated technology lnc.
23V, 2A, 600KHz Asynchronous Synchronous
Description
The TRI1461 is a monolithic step-down switch mode
converter with a built-in power MOSFET. It achieves
2A output current over a wide input supply range with
excellent load and line regulation. Current mode
operation provides fast transient response and
eases loop stabilization. Fault condition protection
includes cycle-by-cycle current limiting and over
temperature protection.
The TRI1461 requires a minimum number of
available standard external components. The
TRI1461 is available in TSOT23-6 and SOT23-6
packages.
TRI1461
Step-Down DC/DC Converte
Features
2A Output Current
180m Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Capacitors
Up to 92% Efficiency
Fixed 600KHz Frequency
Current Mode Operation
Over-Temperature Protection with Hiccup-Mode
Cycle-by-Cycle Over Current Protection
Wide 4.5V to 23V Operating Input Range
Output Adjustable from 0.805V to 15V
10uA Shutdown Current
Available in TSOT23-6 and SOT23-6 Packages
Applications
Pin Assignments
B05 Package (SOT-23-6)
64
(Marking)
1
BSSWGND FB
B07 Package (TSOT-23-6)
64
(Marking)
1
VIN
5
2
VIN
5
2
EN
EN
Battery Charger
Pre-Regulator for Linear Regulators
OLPC, Netbook
Distributed Power System
WLED Drivers
Ordering Information
TRI1461□□□□
DJ: Output Voltage Adjustable
R: Tape / Reel
3
3
Package Type
B05: SOT-23-6
B07: TSOT-23-6
G: Green
BSSWGND FB
TRI1461-1.3-AUG-2010
Figure 1. Pin Assignment of TRI1461
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fitipower integrated technology lnc.
T ypical Application Circuit
Figure 2. Output 3.3V Application Circuit
TRI1461
TRI1461-1.3-AUG-2010
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Functional Pin Description
Pin Name Pin Function
BS
GND Ground Pin.
FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the output voltage.
EN On/Off Control Input. Pull EN above 1.2V and below 5V to turn the device on.
VIN
SW Switch Output. Connect this pin to the switching end of the inductor.
Bootstrap. A 22nF capacitor is connected between SW and BS pins to drive the power switch’s gate above the
supply voltage.
Power Supply Input. Drive 4.5V to 23V voltage to this pin to power on this chip. Connecting a 10uF ceramic bypass
capacitor between VIN and GND to eliminate noise.
Block Diagram
+
FB
0.9V
0.45V
0.805V
-
-
-
+
+
Error
Amplifier
OVP
Oscillator
120KHz / 600KHz
+
CLK
+
-
Current
Comparator
Current Sense
Amplifier
SET
Q
S
CLR
Q
R
Driver
TRI1461
+
-
High-Side
MOSFET
VIN
6V
BS
SW
EN
1.2V
950K
TRI1461-1.3-AUG-2010
+
-
REGULATOR
Ccomp
Rcomp
Internal
Compensation
RC
OVP
OTP
VIN UVLO
GND
Figure 3. Block Diagram of TRI1461
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TRI1461
Absolute Maximum Ratings
Input Supply Voltage (VIN)------------------------------------------------------------------------------- 25V
VSW--------------------------------------------------------------------------------------------------------- -0.3V to V
VBS---------------------------------------------------------------------------------------------------------- V
+ 6V
sw
All Other Pins Voltage ---------------------------------------------------------------------------------- - 0.3V to + 6V
Maximum Junction Temperature (T
Storage Temperature (T
)-------------------------------------------------------------------------------
S
)-----------------------------------------------------------------
J
+ 150℃
- 65℃ to + 150℃
Lead Temperature (Soldering, 10sec.) -------------------------------------------------------------- +260°C
Power Dissipation @ TA=25°C (PD):
SOT-23-6 --------------------------------------------------------------------------------------- +0.4W
TSOT-23-6-------------------------------------------------------------------------------------- +0.4W
Package Thermal Resistance, (θ
):
JA
SOT-23-6 ---------------------------------------------------------------------------------------
+250℃/W
IN
+ 0.3V
TSOT-23-6--------------------------------------------------------------------------------------
+250℃/W
ESD Susceptibility
HBM(Human Body Mode)------------------------------------------------------------------------------ 2KV
Note1：Stresses exceed those ratings may damage the device.
Recommended Operating Conditions
Input Supply Voltage (VIN)------------------------------------------------------------------------------ 4.5V to 23V
Output Voltage (V
Operation Temperature Range------------------------------------------------------------------------ - 40°C to + 85°C
Note2：If out of its operation conditions, the device is not guaranteed to function.
) ----------------------------------------------------------------------------------- 0.805V to 15V
OUT
TRI1461-1.3-AUG-2010
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