TOREX XC6421 User Manual

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A

■



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XC6421 Series

300mA Small High Speed Dual LDO Regulator, Built-in Inrush Current Protection

■GENERAL DESCRIPTION

The XC6421 series is an ultra small CMOS dual LDO regulator, mounting 300mA 2-channel small high speed LDO. The series features high accuracy, high ripple rejection and low dropout voltage. The series is capable of high density board installation by the ultra small package of two low on-resistance regulators. Both output accuracies are ±1% by laser trimming.

Each regulator can be turned off independently to be in stand-by mode by controlling EN pin. In this state, the electric charge at the output capacitor (C the V The output stabilization capacitor (CL) is also compatible with low ESR ceramic capacitors. The high level of output stability is maintained even during frequent load fluctuations, due to the excellent transient response performance.

reaches junction temperature or limit current. The two regulators are completely isolated so that a cross talk during load fluctuations is minimized



■TYPICAL APPLICATION CIRCUITS

voltage quickly returns to the VSS level.

OUT

Over current protection circuit and over heat protection circuit are mounted, these circuits start working when output current

PPLICATIONS

●Mobile phones

●Portable game consoles

●Portable multimedia player

●Digital still cameras, Camcorders

) is discharged via the internal auto-discharge switch, and as a result

L

FEATURES

Maximum Output Current : 300mA Operating Voltage Range : 1.6V～5.5V Output Voltages : 1.2V～3.6V (0.05V increments) Output Accuracy

: ±1% (V

OUT

±20mV(V Dropout Voltage :

210mV@I

Low Power Consumption : 90μA / ch (TYP.) Stand-by Current : 0.1μA Ripple Rejection : 75dB@1kHz ON/OFF Control : Active High CL Discharge Protection Current Limit 450mA (TYP.) Short Circuit 125mA (TYP.) Inrush Current Protection Thermal Shutdown Low ESR Capacitor : 1.0μF Ceramic Capacitor Operating Ambient Temperature

: -40℃ ～ +85℃

Package : USP-6C Environmentally Friendly

: EU RoHS Compliant, Pb Free

TYPICAL PERFORMANCE CHARACTERISTICS

XC6421(V

C

100

=1.8V)

OUT

=3.0V+0.5V

V

IN

=0.1μF(ceramic), CL=1.0μF(ceramic

IN

≧2.00V)

≦1.95V)

OUT

=300mA （V

OUT

, Ta=25℃

p- pAC

ETR0353-003

OUT

=3.0V）

80

60

40

Ripple Re jection : R R (dB)

20

0

0.1 1 10 100 1000

IOUT=0.1m A IOUT=1mA IOUT=30mA IOUT=100mA

Ripple Frequ enc y : f (kHz)

1/24

XC6421 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

     

* The dissipation pad for the USP-6C package should be solder-plated in recommended mount pattern and metal masking to enhance mounting strength and heat release. If the pad needs to be connected to other pins, it should be connected to the V

PIN NUMBER

USP-6C

1 EN2 ON/OFF Control 2

2 VIN Power Input

3 EN1 ON/OFF Control 1

4 VSS Ground

5 V

6 V

V

OUT2

V

OUT1

V

SS

PIN NAME FUNCTIONS

Output 1

OUT1

Output 2

OUT2

EN2

V

IN

EN1

(No. 4) pin.

SS

2/24

●

■PRODUCT CLASSIFICATION

Ordering Information

XC6421①②③④⑤⑥-⑦

DESIGNATOR ITEM SYMBOL DESCRIPTION

①

②

③④

⑤⑥-⑦



(*1)

The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.



DESIGNATOR ③④: Output Voltage

③④

(*1)

EN1: Active High , EN2: Active High

Basic Function A

Built-in Thermal Shutdown Inrush Current Protection V

: CL Discharge, V

OUT1

OUT2

: CL Discharge

Enable Pin B EN1: With Pull-down EN2: With Pull-down

Output Voltage

01〜

See the chart below

Package (Order Unit) ER-G USP-6C (3,000/Reel)

VR1(V) VR2(V)

③④

VR1(V) VR2(V)

XC6421

Series

01 1.20 1.20 34 2.80 3.00 02 1.20 1.50 35 2.80 3.30 03 1.20 2.50 36 1.20 3.60 04 1.20 2.85 37 3.60 1.20 05 1.20 3.00 38 1.20 2.80 06 1.20 3.30 39 3.30 2.00 07 1.50 1.50 40 3.00 3.30 08 1.50 1.80 41 3.30 3.30 09 1.50 2.50 42 1.30 1.50 10 1.50 2.85 43 2.60 2.80 11 1.50 3.00 44 3.10 3.30 12 1.50 3.30 45 1.50 2.60 13 1.80 1.80 46 2.60 3.30 14 1.80 2.50 47 3.40 3.40 15 2.85 2.85 48 2.85 2.60 16 1.80 2.85 49 3.30 1.80 17 1.80 3.00 50 1.80 1.20 18 3.00 1.80 51 3.10 3.10 19 1.80 3.30 52 1.50 3.10 20 2.50 2.50 53 3.30 2.80 21 2.50 2.80 54 3.00 2.80 22 2.50 2.85 55 3.30 3.00 23 3.30 1.50 56 3.60 3.60 24 2.50 3.00 57 3.30 3.10 25 2.50 3.30 58 3.10 3.00 26 2.85 3.00 59 3.10 2.90 27 2.85 3.30 60 3.10 2.50 28 3.00 3.00 61 3.00 2.90 29 1.20 1.80 62 3.00 2.50 30 1.30 2.80 63 1.80 1.90 31 1.50 2.80 64 1.80 1.85 32 1.80 2.80 65 1.70 1.70 33 2.80 2.80

*For other output voltage combinations, please contact your local Torex sales office or representative.

3/24

XC6421 Series

■BLOCK DIAGRAM

■ABSOLUTE MAXIMUM RATINGS

Output Voltage 1, Output Voltage2 V

EN1, EN2 Input Voltage V

Power Dissipation USP-6C Pd

Operating Ambient Temperature Topr -40～+85 ℃

(*1)

(*2)

4/24

Storage Temperature Tstg -55～+125 ℃

Pd > { (VIN-V

The power dissipation figure shown is PCB mounted. Please refer to page 22 for details.

* Diodes inside the circuits are ESD protection diodes and parasitic diodes.

PAR AMET ER SYMBOL RATINGS UNITS

Input Voltage VIN Vss-0.3～Vss +7.0 V

Output Current I

)×I

OUT1

+ (VIN-V

OUT2

)×I

OUT2

OUT1+IOUT2

OUT1, VOUT2

EN1, VEN2

}

800

(*1)

mA

VSS-0.3～VIN+0.3≦Vss +7.0 V

V

-0.3～Vss +7.0 V

SS

120

1000 (PCB mounted)

(*2)

mW

■ELECTRICAL CHARACTERISTICS

●XC6421 Series

Regulator 1, Regulator 2

PAR AMET ER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

V

OUT(T)

(*3)

V

×1.01

OUT(T)

(*3)

V

+20mV

OUT(T)

Output Voltage V

OUT(E)

×0.99

ｰ

20mV

(*2)

V

(*2)

V

OUT(T)

V

≧

2.0V, VEN=VIN, I

OUT

(*2)

V

＜

2.0V, VEN=VIN, I

OUT

=10mA

XC6421

Series

Ta =2 5 ℃

CIRCUITS

(*2)

V ①

(*2)

V ①

Maximum Output Current I

Load Regulation ΔV

Dropout Voltage

(*4)

Vdif

OUTMAX

OUT

VEN=VIN, 0.1mA≦I

I

OUT

Supply Current ISS V

I

Stand-by Current

STB

V

EN=VIN

≦

OUT

=300mA, VEN=VIN

, I

V

EN=VSS

OUT

=0mA

EN=VIN

300mA

300 - - mA ①

- 25 45 mV ① See the chart below mV ①

- 90 190

μA ②

0.01 0.1 μA ②

2.5V≦VIN≦5.5V,

≦2.0V）,

（V

OUT(T)

, I

Line Regulation

(ΔV

ΔV

/

OUT

・

V

)

IN

OUT

V

EN=VIN

V

+0.5V≦VIN≦5.5V,

OUT(T)

（V

OUT(T)

V

EN=VIN

=30mA

OUT

≧2.05V）,

, I

=30mA

OUT

- 0.02 0.1 %/V ①

Input Voltage VIN - 1.6 - 5.5 V ①

Output Voltage

Temperature

Characteristics

(ΔTa

ΔV

/

OUT

・

V

)

OUT

V

, I

EN=VIN

-40℃≦Ta ≦85℃

OUT

=10mA,

- ±100 - ppm /℃ ①

(R&D Value)

V

,

EN=VIN

Ripple Rejection Rate PSRR

Limit Current I

Short-Circuit Current I

EN”H”Level Voltage V

EN”L”Level Voltage V

EN”H”Level Current I

EN”L”Level Current I

CL Discharge Resistance R

Inrush Current

Thermal Shutdown Detect

Temperature

Thermal Shutdown

Release Temperature

Thermal Shutdown

Release Temperature

T

TSD－TTSR

LIM

SHORT

ENH

ENL

ENH

ENL

DCHG

-

I

RUSH

T

TSD

T

TSR

=｛V

V

IN

+1.0｝+0.5Vp-pAC

OUT(T)

I

=30mA, f=1kHz

OUT

V

EN=VIN

=VIN, V

V

EN

-

- 75 - dB ③

310 450

OUT=VSS

- 125 - mA ①

- mA ①

1.0 - 5.5 V ①

- 0 - 0.3

=5.5V 2.9 6.0 9.5

V

EN=VIN

V

EN=VSS

=5.5V, VEN =VSS,

V

IN

V

=2.0V

OUT

-0.1 - 0.1 μA ①

- 230 - Ω ①

- 150 - mA ①

Junction Temperature - 150 - ℃ ①

Junction Temperature - 125 - ℃ ①

Junction Temperature

- 25 - ℃

μA ①

V ①

①

NOTE: Unless otherwise stated, {V

IN=VOUT(T)

+1.0V}

Each channel is measured when the other channel is turned off (V

（*1）V (ie. The output voltage when “V （*2）Characteristics of the actual V （*3）V （*4）Vdif＝{V

: Effective output voltage (see the voltage chart)

OUT(E)

: Nominal output voltage

OUT(T)

IN1－VOUT1

V

: A voltage equal to 98% of the output voltage whenever an amply stabilized {V

OUT1

V

: The input voltage when V

IN1

}

+1.0V” is provided at the VIN pin while maintaining a certain I

OUT(T)

by nominal output voltage is shown in the voltage chart.

OUT(E)

appears as input voltage is gradually decreased.

OUT1



  

EN=VSS

).

value.

OUT

+1.0V} is input with every I

OUT(T)

OUT

.

5/24

XC6421 Series

■OUTPUT VOLTAGE CHART

 Regulator 1, Regulator 2

●Voltage chart    

NOMINAL

OUTPUT

VOLTAE

(V)

V

OUT(T)

OUTPUT

VOLTAGE

(V)

V

Vdif V

OUT(E)

MIN. MAX. TYP.

DROPOUT

VOLTAGE

(mV)

MAX.

NOMINAL

OUTPUT

VOLTAE

(V)

V

OUT(T)

OUTPUT

VOLTAGE

(V)

Vdif

OUT(E)

MIN. MAX. TYP.

DROPOUT

VOLTAGE

Ta =2 5 ℃

(mV)

MAX.

1.200 1.1800 1.2200 2.500 2.4750 2.5250

1.250 1.2300 1.2700

1.300 1.2800 1.3200 2.600 2.5740 2.6260

1.350 1.3300 1.3700

1.400 1.3800 1.4200 2.700 2.6730 2.7270

1.450 1.4300 1.4700 2.750 2.7225 2.7775

1.500 1.4800 1.5200 2.800 2.7720 2.8280

1.550 1.5300 1.5700

1.600 1.5800 1.6200 2.900 2.8710 2.9290

1.650 1.6300 1.6700 2.950 2.9205 2.9795

1.700 1.6800 1.7200 3.000 2.9700 3.0300

1.750 1.7300 1.7700

1.800 1.7800 1.8200 3.100 3.0690 3.1310

1.850 1.8300 1.8700 3.150 3.1185 3.1815

1.900 1.8800 1.9200 3.200 3.1680 3.2320

1.950 1.9300 1.9700

2.000 1.9800 2.0200 3.300 3.2670 3.3330

2.050 2.0295 2.0705 3.350 3.3165 3.3835

580 680

2.550 2.5245 2.5755

515 610

2.650 2.6235 2.6765

460 550

2.850 2.8215 2.8785

380 450

3.050 3.0195 3.0805

330 390

3.250 3.2175 3.2825

240 290

210 260

6/24

2.100 2.0790 2.1210 3.400 3.3660 3.4340

2.150 2.1285 2.1715 3.450 3.4155 3.4845

2.200 2.1780 2.2220 3.500 3.4650 3.5350

2.250 2.2275 2.2725 3.550 3.5145 3.5855

2.300 2.2770 2.3230 3.600 3.5640 3.6360

2.350 2.3265 2.3735

2.400 2.3760 2.4240

2.450 2.4255 2.4745

295 350

XC6421

Series

■OPERATIONAL EXPLANATION

 

The voltage divided by resistors Rx1 & Rx2 is compared with the internal reference voltage by the error amplifier. The



P-channel MOSFET which is connected to the Output pin (V



voltage at the Output pin (V



circuit protection and thermal protection operate in relation to the level of output current and heat dissipation. Further, the IC’s



internal circuitry can be shutdown via the EN pin signal.



) is controlled and stabilized by a system of negative feedback. The current limit circuit, short

OUT

               

EN1

V

IN

EN2

XC6421ABxxxxseries

In-Rush-

Current-

Prevent

In-Rush-

Current-

Prevent

TSD

ON/OFF

Control

ON/OFF

Control

Current

Limit

Current

Limit

The XC6421 series needs an output capacitor (C

compensation, please place an output capacitor (C

) for phase compensation. In order to ensure the stable phase

L

) of 1.0μF or bigger at the V

L

a stable power input, please connect an input capacitor (C

The XC6421 series has current limiter and droop shape of fold-back circuit. When the load current reaches the current limit, the droop current limiter circuit operates and the output voltage drops. When the output voltage dropped, the fold-back circuit operates and the output current goes to decrease. The output current finally falls at the level of 125mA when the output pin is short-circuited.

The IC's internal circuitry can be shutdown via the signal from the EN pin. In shutdown mode, the XC6421 series enables the electric charge at the output capacitor (C (V

) quickly returns to the ground pin (VSS) level.

OUT

) to be discharged via the internal auto-discharge switch, and as a result the output pin

L

On the other hand, the XC6421 series has a pull-down resistor at the EN pin inside, so that the EN pin input current flows.

If this EN pin voltage is set with the specified voltage range, the logic is fixed and the IC will operate normally. However, the supply current may increase as a result of shoot-through current in the IC's internal circuitry when a medium voltage is input to the EN pin.

) is then driven by the subsequent control signal. The output

OUT

V

1

OUT

C

FB

R11

+

Error Amp

-

Voltage

Reference

+

Error Amp

-

Voltage

Reference

) of 1.0μF between V

IN

R

1

DCHG

R12

V

SS

V

2

OUT

C

FB

R21

R

2

DCHG

R22

pin and VSS pin as close as possible. For

OUT

pin and VSS pin.

IN

7/24

XC6421 Series

■OPERATIONAL EXPLANATION (Continued)

XC6421 series can quickly discharge the electric charge at the output capacitor (CL), when a low signal is inputted to the EN pin, which enables a part of the IC circuit put into OFF state, via the N-channel transistor located between the V

is 5.5V (TYP.) and V

V

IN

auto-discharge resistance and the output capacitance (C resistance [R N channel transistor is calculated by the following formulas.

V : Output voltage after discharge V

: Output voltage

OUT(E)

t: Discharge time,

τ: R

DCHG×CL

CL：Output capacitance R

DCHG：CL

auto-discharge resistance

When the junction temperature of the built-in driver transistor reaches the temperature limit, the thermal shutdown circuit operates and the driver transistor will be set to OFF. The IC resumes its operation when the thermal shutdown function is released and the IC’s operation is automatically restored because the junction temperature drops to the level of the thermal shutdown release voltage.

The inrush current protection circuit is built in the XC6421 series. When the IC starts to operate, the protection circuit limits the inrush current as 150mA (TYP.) from input pin (VIN) to output pin (V

8/24

pin and the VSS pin (cf. BLOCK DIAGRAM). The C

OUT

] and an output capacitance (C

DCHG

for charging CL capacitor.

OUT)

is 2.0V (TYP.). Moreover, discharge time of the output capacitor (CL) is set by the CL

OUT

) as τ(τ= C

L

–t/

V = V

OUT(E)

x e

τ

, or t=τIn ( V

discharge resistance is set to 230Ω when

L

). By setting time constant of a CL auto-discharge

L

x R

L

), the output voltage after discharge via the

DCHG

/ V )

OUT(E)

TOREX XC6421 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual