
XC6601
Series
1/11 
Low Voltage Input LDO Voltage Regulators 
Preliminary 
FEATURES
Maximum Output Current 
Dropout Voltage 
Bias Voltage Range 
: 400mA 
(Limiter 500mA TYP.)
: 35mV@I
OUT
=100mA (TYP.) 
(at V
BIAS
 - 
V
OUT(E)
=2.4V) 
: 
2.5V ~ 6.0V  
(V
BIAS
 - V
OUT(E)
: 1.0V ~ 3.0V
(V
IN
 V
BIAS
) 
: 0.7V ~ 1.8V
 (50mV increments)
:
20mV 
: I
BIAS
=25
A , I
IN
=1.0
: I
BIAS
=0.01
A , I
IN
=0.01
: V
BIAS
=2.0V, V
IN
=0.4V (TYP.) 
:150
/125
 (TYP.) 
: -40
 ~ 85
0.9V) 
Input Voltage Range 
Output Voltage Range 
Output Voltage Accuracy 
Power Consumption 
A 
(TYP.)
A 
(TYP.)
U.V.L.O. 
TSD (Detect/Release) 
Operating Temperature Range 
C
L
 High Speed Auto-Discharge 
Low ESR Capacitor 
Packages 
: Ceramic Capacitor Compatible
: USP-6C, SOT-25, SOT-89-5
APPLICATIONS 
Mobile phones 
Cordless phones 
Wireless communication equipment 
Portable games 
Cameras 
Audio visual equipment 
Portable AV equipment 
PDAs 
TYPICAL APPLICATION CIRCUIT 
V
BIAS
 =3.6V , V
IN
 =1.5V , V
OUT
 =1.2V 
TYPICAL PEFORMANCE 
  CHARACTERISTICS
Dropout Voltage vs. Output Current 
ETR0335_002
GENERAL DESCRIPTION 
The XC6601 series is a CMOS LDO voltage regulator with precise (
On resistance even where low output voltages to achieve high efficiency of the output current. The series is suited for the 
application which requires low dropout voltage operation. The series consists of a voltage reference, an error amplifier, a driver 
transistor, a current limiter, a fold back circuit, a thermal shutdown (TSD) circuit, a Under Voltage Lock Out (U.V.L.O.) and a 
phase compensation circuit. 
The output voltage is selectable in 50mV increments within the range of 0.7V to 1.8V using laser trimming technologies. The 
output stabilization capacitor (C
L
) is also compatible with low ESR ceramic capacitors. 
 The over current protection circuit (the current limiter and the fold back circuit) and the thermal shutdown circuit (the TSD 
circuit) are built-in. These two protection circuits will operate when the output current reaches limit level or the junction 
temperature reaches temperature limit level. 
With the built-in U.V.L.O. function, the regulator output is forced OFF when the V
BIAS
 pin or the V
IN
 pin becomes the U.V.L.O. 
voltage or lower. 
The CE function enables the output to be turned off and the series becomes a 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 
(C
L
) to be discharged via the internal auto-discharge switch placed between the V
OUT
 pin and the V
SS
 pin, as a result the V
OUT
pin quickly returns to the V
SS
 level.  
20mV) outputs which enables the operation in ultra low