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UD32121 Datasheet Preview

UD32121 Datasheet

1.4MHz STEP-DOWN CONVERTER

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UNISONIC TECHNOLOGIES CO., LTD
UD32121
LINEAR INTEGRATED CIRCUIT
1.2A, 32V, 1.4MHz
STEP-DOWN CONVERTER
DESCRIPTION
The UTC UD32121 is a monolithic step-down switching mode
converter with a built-in power MOSFET. It regulates input voltages
from 4.5V to 32V down to an output voltage as low as 0.81V, and
supplies up to 1.2A of load current.
Current mode operation provides fast transient response and
eases loop stabilization. Fault condition protection includes
cycle-by-cycle current limiting and thermal shutdown.
The UTC UD32121 requires a minimum number of readily
available standard external components.
APPLICATIONS
* Distributed Power Systems
* Battery Charger
* Pre-Regulator for Linear Regulators
* WLED Drivers
FEATURES
* 1.2A Peak Output Current
* 0.35Ω Internal Power MOSFET Switch
* Stable with Low ESR Output Ceramic Capacitors
* Up to 92% Efficiency
* 0.1μA Shutdown Mode
* Fixed 1.4MHz Frequency
* Thermal Shutdown
* Cycle-by-Cycle Over Current Protection
* Wide 4.5V to 32V Operating Input Range
* Output Adjustable from 0.81V to 15V
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UD32121L-AG6-R
UD32121G-AG6-R
Package
SOT-26
54
6
1 23
SOT-26
Packing
Tape Reel
UD32121G-AG6-R
(1)Packing Type
(2)Package Type
(3)Green Package
(1) R: Tape Reel
(2) AG6: SOT-26
(3) G: Halogen Free and Lead Free, L: Lead Free
www.unisonic.com.tw
Copyright © 2019 Unisonic Technologies Co., Ltd
1 of 5
QW-R115-036.A




UTC

UD32121 Datasheet Preview

UD32121 Datasheet

1.4MHz STEP-DOWN CONVERTER

No Preview Available !

UD32121
MARKING
654
UDX32
123
PIN CONFIGURATION
BST 1
LINEAR INTEGRATED CIRCUIT
6 SW
GND 2
5 IN
FB 3
4 EN
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
PIN NAME
BST
GND
FB
EN
VIN
SW
DESCRIPTION
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side
N-Channel MOSFET switch. Connect a 0.01μF or greater capacitor from SW to
BST to power the high side switch.
Ground.
Feedback. An external resistor divider from the output to GND, tapped to the FB pin
sets the output voltage. To prevent current limit run away during a short circuit fault
condition, the frequency foldback comparator lowers the oscillator frequency when
the FB voltage is below 250mV.
On/Off Control Input. Pull EN above 1.2V to turn the device on. For automatic
enable, connect a 100kΩ resistor between this pin and Vin pin.
Supply Voltage. The UD32121 operates from a +4.5V to +32V unregulated input.
C1 is needed to prevent large voltage spikes from appearing at the input.
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load. Note that a
capacitor is required from SW to BS to power the high-side switch.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 5
QW-R115-036.A


Part Number UD32121
Description 1.4MHz STEP-DOWN CONVERTER
Maker UTC
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