16V Input Voltage, Step-Down DC/DC Controller

The XC9221 series is a group of multi-purpose step-down DC/DC controller ICs. The ICs enable a high efficiency, stable power supply with an output current up to 3A to be configured using only a transistor, a coil, a diode, and two capacitors connected externally.

Low ESR capacitors such as a ceramic capacitor can be used as an output capacitor.

The XC9221 series has a 0.9V (±1.5%) reference voltage, and using externally connected resistors, the output voltage can be set freely. With an internal switching frequency of 300kHz and 500kHz 1MHz, small external components can also be used. The As for the soft-start time, the XC9221A and C series is internally set to 4msec and the XC9221B and D series can be externally set-up. With the built-in UVLO (Under Voltage Lock Out) function, the external P-channel driver transistor is forced OFF when input voltage becomes 2.3V or lower. Two types of package, SOT-25 and USP-6, are available.

Feature

Operating Voltage Range2.8V～16.0V
Output VoltageExternally Set0.9V(Accuracy ±1.5V)
Oscillation Frequency300k,500k,1.0MHz
Control MethodsPWM/PFM automatic switching
Soft-Start4ms, internally set(Types A)
Externally set (Types B)
Protection CircuitsIntegral protection 1.0ms(Types A,B), Short Circuit Protection
Low ESR CapacitorCeramic Capacitor

Typical Application Circuit

Quality Reports

Technical Document

Packages

Package Number of Pins Pcs/Reel Package Size(mm)
SOT-25 5 3,000 2.8 x 2.9 x 1.3
USP-6C 6 3,000 1.8 x 2.0 x 0.6

XC9221 Series Part Numbers

Part number Sample Type Output Voltage Oscillation Frequency Packages EDA Online Store
XC9221A093ER-G Soft-start internally set with integral protection function FB type 300kHz USP-6C
XC9221A093MR-G Soft-start internally set with integral protection function FB type 300kHz SOT-25
XC9221A095ER-G Soft-start internally set with integral protection function FB type 500kHz USP-6C
XC9221A095MR-G Soft-start internally set with integral protection function FB type 500kHz SOT-25
XC9221A09AER-G Soft-start internally set with integral protection function FB type 1.0MHz USP-6C
XC9221A09AMR-G Soft-start internally set with integral protection function FB type 1.0MHz SOT-25
XC9221B093ER-G Soft-start externally set with integral protection function FB type 300kHz USP-6C
XC9221B093MR-G Soft-start externally set with integral protection function FB type 300kHz SOT-25
XC9221B095ER-G Soft-start externally set with integral protection function FB type 500kHz USP-6C
XC9221B095MR-G Soft-start externally set with integral protection function FB type 500kHz SOT-25
XC9221B09AER-G Soft-start externally set with integral protection function FB type 1.0MHz USP-6C
XC9221B09AMR-G Soft-start externally set with integral protection function FB type 1.0MHz SOT-25
XC9221C093ER-G Soft-start internally set without integral protection function FB type 300kHz USP-6C
XC9221C093MR-G Soft-start internally set without integral protection function FB type 300kHz SOT-25
XC9221C095ER-G Soft-start internally set without integral protection function FB type 500kHz USP-6C
XC9221C095MR-G Soft-start internally set without integral protection function FB type 500kHz SOT-25
XC9221C09AER-G Soft-start internally set without integral protection function FB type 1.0MHz USP-6C
XC9221C09AMR-G Soft-start internally set without integral protection function FB type 1.0MHz SOT-25
XC9221D093ER-G Soft-start externally set without integral protection function FB type 300kHz USP-6C
XC9221D093MR-G Soft-start externally set without integral protection function FB type 300kHz SOT-25
XC9221D095ER-G Soft-start externally set without integral protection function FB type 500kHz USP-6C
XC9221D095MR-G Soft-start externally set without integral protection function FB type 500kHz SOT-25
XC9221D09AER-G Soft-start externally set without integral protection function FB type 1.0MHz USP-6C
XC9221D09AMR-G Soft-start externally set without integral protection function FB type 1.0MHz SOT-25

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