The TCR4DG series are CMOS general-purpose single-output
voltage regulators with an on/off control input, featuring low dropout
voltage, low output noise voltage and low inrush current.
These voltage regulators are available in fixed output voltages
between 1.0 V and 4.5 V and capable of driving up to 420 mA.
They feature over-current protection, over-temperature protection,
Inrush current protection circuit and Auto-discharge function.
The TCR4DG series are offered in the ultra small plastic mold
package WCSP4E (0.645 mm x 0.645 mm; t 0.43 mm (max)). It has
a low dropout voltage of 193 mV (3.3 V output, IOUT = 420 mA) with
low output noise voltage of 38 μVrms (2.5 V output) and a load
transient response of only ⊿VOUT = ±115 mV ( IOUT = 1 mA ⇔ 420 mA, COUT =1.0 μF).
As small ceramic input and output capacitors can be used with the TCR4DG series, these devices are ideal for portable
applications that require high-density board assembly such as cellular phones.

Features
• Low Drop-Out voltage
VDO = 193 mV (typ.) at 3.3 V-output, IOUT = 420 mA
• Low output noise voltage
VNO = 38 μVrms (typ.) at 2.5 V-output, IOUT = 10 mA, 10 Hz ≤ f ≤ 100 kHz
• Fast load transient response (⊿VOUT = ±115 mV (typ.) at IOUT = 1 ⇔ 420 mA, COUT =1.0 μF )
• High ripple rejection ( R.R = 70 dB (typ.) at 2.5 V-output, IOUT = 10 mA, f = 1 kHz )
• Over-current protection
• Over-temperature protection
• Inrush current protection circuit
• Auto-discharge function
• Pull down connection between CONTROL and GND
• Ceramic capacitors can be used ( CIN = 1.0μF, COUT =1.0 μF )
• Ultra small package WCSP4E (0.645 mm x 0.645 mm ; t 0.43 mm (max))