1A, 0.5V Low Input Voltage, High Speed LDO Regulator (Adjustable Soft-start)

The XC6603 series is a low voltage input (0.5V) operation and provides high accuracy ±15mV / ±20mV and can supply large current efficiently due to its ultra low on-resistance even at low output voltages.

The series is ideally suited to the applications which require high current in low input/output voltages and consists of a N-ch driver transistor, a voltage reference, an error amplifier, a current limiter, a foldback circuit, a thermal shutdown (TSD) circuit, an under voltage lock out (UVLO) circuit, a soft-start circuit and a phase compensation circuit.

Output voltage is selectable in 0.1V increments within a range of 0.5V to 1.8V using laser trimming technology and ceramic capacitors can be used for the output stabilization capacitor (CL). The inrush current (IRUSH) from VIN toVOUT for charging CL at start-up can be reduced and makes theVIN stable. Soft-start time can be adjustable with connecting a capacitor to the SS pin.

The inrush current conflicts with the soft-start time, therefore if soft-start is set longer, the inrush current is decreased. The CE function enables the output to be turned off and the series to be put in stand-by mode resulting in greatly reduced power consumption. At the time of entering the stand-by mode, the series enables the electric charge at the output capacitor (CL) to be discharged via the internal switch. As a result the VOUT pin quickly returns to the VSS level. The CE pull-down function keeps the IC to be in stand-by mode even if the CE pin is left open.

Feature

MaximumOutput Current 1A(1.3ALimit)
On Resistance 0.15Ω@VBIAS=3.6V,VOUT=1.2V
Bias Voltage Range 2.5V~6.0V
Input Voltage Range 0.5V~3.0V
Output Voltage Range 0.5V~1.8V(0.1V increments)
Output VoltageAccuracy ±0.015V@VOUT<1.2V
±0.020V@VOUT≧1.2V
Ripple Rejection 60dB@f=1kHz(VBIAS_PSRR)
75dB@f=1kHz(VIN_PSRR)
Quiescent Current 100μA(VBIAS),6.5μA(VIN)@VOUT=1.2V
Stand-by Current 0.01μA(VBIAS),0.01μA(VIN)
UVLO 1.8V(VBIAS),0.4V(VIN)
TSD 150℃@Detect,125℃@Release
Protection Circuits Foldback Current Limit,TSD,UVLO
Functions Adjustable Soft-start time with an external component
CE Pull-Down (Active High)
CL Auto Discharge
Operating Ambient Temperature -40℃~+85℃
Capacitor Low ESR Ceramic(2.2μF)
Environmentally Friendly EU RoHS compliant, Pb free

Typical Application Circuit

Technical Document

Packages

Package Number of Pins Pcs/Reel Package Size(mm)
SOT-26W 6 3,000 2.8 x 2.9 x 1.3
USP-6C 6 3,000 1.8 x 2.0 x 0.6

XC6603 Series Part Numbers

Part number Sample Type Output Voltage Output Voltage Accuracy Packages EDA Online Store
XC6603A051ER-G Adjustable Soft-start time with an external capacitor 0.5V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A051MR-G Adjustable Soft-start time with an external capacitor 0.5V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A061ER-G Adjustable Soft-start time with an external capacitor 0.6V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A061MR-G Adjustable Soft-start time with an external capacitor 0.6V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A071ER-G Adjustable Soft-start time with an external capacitor 0.7V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A071MR-G Adjustable Soft-start time with an external capacitor 0.7V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A081ER-G Adjustable Soft-start time with an external capacitor 0.8V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A081MR-G Adjustable Soft-start time with an external capacitor 0.8V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A091ER-G Adjustable Soft-start time with an external capacitor 0.9V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A091MR-G Adjustable Soft-start time with an external capacitor 0.9V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A101ER-G Adjustable Soft-start time with an external capacitor 1.0V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A101MR-G Adjustable Soft-start time with an external capacitor 1.0V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A111ER-G Adjustable Soft-start time with an external capacitor 1.1V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A111MR-G Adjustable Soft-start time with an external capacitor 1.1V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A121ER-G Adjustable Soft-start time with an external capacitor 1.2V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A121MR-G Adjustable Soft-start time with an external capacitor 1.2V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A131ER-G Adjustable Soft-start time with an external capacitor 1.3V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A131MR-G Adjustable Soft-start time with an external capacitor 1.3V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A141ER-G Adjustable Soft-start time with an external capacitor 1.4V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A141MR-G Adjustable Soft-start time with an external capacitor 1.4V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A151ER-G Adjustable Soft-start time with an external capacitor 1.5V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A151MR-G Adjustable Soft-start time with an external capacitor 1.5V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A161ER-G Adjustable Soft-start time with an external capacitor 1.6V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A161MR-G Adjustable Soft-start time with an external capacitor 1.6V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A171ER-G Adjustable Soft-start time with an external capacitor 1.7V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A171MR-G Adjustable Soft-start time with an external capacitor 1.7V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W
XC6603A181ER-G Adjustable Soft-start time with an external capacitor 1.8V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) USP-6C
XC6603A181MR-G Adjustable Soft-start time with an external capacitor 1.8V ±0.015V(VOUT<1.2V),±0.020V(VOUT≧1.2V) SOT-26W

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