DESCRIPTION
什么争鸣The EUP3458 is current mode, step-down switching regulator capable of driving 1.2A continuous load with excellent line and load regulation. The EUP3458 can operate with an input voltage range from 4.5V to 30V and the output can be externally t from 0.8V to 15V with a resistor divider.
Fault protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 1µA of supply current. Internal soft-start minimizes the inrush current and the output overshoot.
The EUP3458 is available in SOT23-6 and TSOT23-6 packages.
导游词黄花鸢尾Typical Application Circuit
FEATURES
1.2A Output Current
0.3Ω Internal DMOS Output Switch 4.5V to 30V Input Operating Range Output Adjustable from 0.8V to 15V Up to 92% Efficiency 1µA Shutdown Current Fixed 1.2MHz Frequency
Thermal Shutdown and Overcurrent Protection Input Supply Undervoltage Lockout
Available in SOT23-6 and TSOT23-6 Packages
RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free
APPLICATIONS
Distributed Power Systems Battery Charger
Pre-Regulator for Linear Regulators WLED Drivers
Figure 1. 12V/24V to 3.3V Application Circuit
Typical Application Circuit (continued)
Figure 2. 12V/24V to 5V Application Circuit
Pin Configurations
Package Type
Pin Configurations
SOT23-6 TSOT23-6
赖昌兴Pin Description
Pin Name
SOT23-6
TSOT23-6
DESCRIPTION
BS 1 1 High-Side Gate Driver Boostrap Supply. BS provides power to the gate driver of n-channel MOSFET switch. Connect a 10nF or greater capacitor from SW to BS.
GND 2 2 Ground. This pin is the voltage reference for the regulated output
voltage. It should be kept away from the D1 and input capacitor for noi prevention.
FB
3
3
Output Feedback Input. FB ns the output voltage to regulate that voltage. Connect FB to an external resistor divider to t the output voltage. The value of the divider resistors also t loop bandwidth. EN 4 4
Enable Input. EN is a logic input that controls the regulator on or off. Drive EN logic high to turn on the regulator, and t EN logic low to turn it off. Don't leave EN pin floating. Directly connect EN to IN (or through a resistance) for automatic startup.
IN 5 5 Input Supply Pin. IN supplies the power to the IC and the power switch. Connect IN to a 4.5V to 30V power source. Bypass IN to GND with a suitably large value capacitor to minimize input ripple to the IC.
SW
6
6
Power Switcher Output. Connect the output LC filter from SW to the output.
Ordering Information
Order Number Package Type Marking Operating Temperature Range
EUP3458VIR1SOT23-6xxxxx
AZ00
-40°C to +85°C
EUP3458OIR1TSOT23-6xxxxx
AZ00
-40°C to +85°C
请节哀
EUP3458□□□□
Lead Free Code
1: Lead Free, Halogen Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
Package Type
V: SOT
O: TSOT
Block Diagram
Figure 3. Functional Block Diagram
Absolute Maximum Ratings (1)
Input V oltage (V IN) ----------------------------------------------------------------- -0.3V to 35V
Enable Input (V EN) ----------------------------------------------------------------- -0.3V to 35V
Switch V oltage (V SW) ------------------------------------------------------ -1V to V IN +0.3V
Boot Strap V oltage (V BS) ------------------------------------------------ V SW-0.3V to V SW +6V
All Other Pins --------------------------------------------------------------------- -0.3V to 6V
Junction Temperature ------------------------------------------------------------------- 150°C
Storage Temperature ------------------------------------------------------ -65°C to +150°C
Lead Temp (Soldering, 10c) ------------------------------------------------------- 260°C
Thermal Resistance θJA (SOT23-6) ------------------------------------------------- 205°C/W
Thermal Resistance θJA (TSOT23-6) ----------------------------------------------- 200°C/W Recommend Operating Conditions (2)
Supply Voltage (V IN) ------------------------------------------------------------- 4.5V to 30V
簧篇新年语句Operating Temperature Range ----------------------------------------------- -40°C to +85°C
Note (1): Stress beyond tho listed under “Absolute Maximum Ratings” may damage the device.
Note (2): The device is not guaranteed to function outside the recommended operating conditions.
Electrical Characteristics
The ●denote specifications which apply over the full operating temperature range, otherwi specifications are
T A=+25°C. V EN=5V, V IN=12V unless otherwi specified.
EUP3458
Unit Parameter Conditions
Min. Typ. Max.
0.784 0.800 0.816
V Feedback V oltage 4.5V≤V IN≤30V
●0.776 0.800 0.824 Shutdown Supply Current V EN=0V 1 5 µA Operating Supply Current V EN=2V,V FB=1V, V BS=10V 0.55 1 mA Switch On Resistance 0.3 ΩSwitch Leakage V EN=0V, V SW=0V 5 µA Switch Peak Current Limit 1.6 2.1 A Oscillator Frequency 1 1.2 1.4 MHz Short Circuit Frequency V FB=0V 450 KHz Maximum Duty Cycle V FB=0.7V 90 % Minimum On-Time 100 ns
Enable Low V oltage 0.4
V Enable High V oltage 1.5
Input Undervoltage Lockout Threshold In Rising 3.3 3.6 3.9 V
Input Undervoltage Lockout Threshold
300 mV Hysteresis
Enable Leakage Current V EN=0V 0.1 5 µA Thermal Shutdown 165 °C
Typical Operating Characteristics
V IN =12V , V OUT =3.3V , C1 =10µF, C2=22µF, L1=4.7µH, T A =25°C, unless otherwi noted.
Figure4.
Figure6.
Figure8.
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Figure7.
Figure9.
