APE8837 [A-POWER]

DUAL CHANNEL LDO REGULATORS WITH ENABLE; 双通道LDO稳压器启用


型号：	APE8837
厂家：	ADVANCED POWER ELECTRONICS CORP.
描述：	DUAL CHANNEL LDO REGULATORS WITH ENABLE 双通道LDO稳压器启用稳压器
文件：	总7页 (文件大小：210K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Advanced Power

Electronics Corp.

APE8837

DUAL CHANNEL LDO REGULATORS WITH ENABLE

FEATURES

DESCRIPTION

The APE8837 is a high accurately, low noise, high

Input Voltage Range : 2.5V to 6V

ripple rejection ratio, low dropout, dual CMOS LDO voltage

Varied Fixed Output Voltage Combinations

150mV Dropout at 100mA Output

Current (Vout≧2.8V)

regulators with enable function. The EN function allows the

output of each regulator to be turned off independently,

resulting in greatly reduced power consumption.

The APE8837 has the soft start function to suppress

the inrush current. The current limit is over 250mA per

channel and also operates as a short protection for the

output current limiter. The output voltage for each regulator

is set independently by metal trimming.

The APE8837 is fully compatible with low ESR ceramic

capacitors, reducing cost and improving output stability. This

high level output stability is maintained even during frequent

load fluctuations, due to the excellent transient response

performance and high PSRR achieved across a broad range

of frequency. It is available in the SOT-26 and DFN 2x2

packages.

Output Current: 200mA/channel (typ.)

Low Quiescent Current

Standby Current: 2uA (typ.)

Current Limit and Short Current Protections

Thermal Shutdown Protection

Fast Transient Response

Low ESR Capacitor Compatible (X7R, X5R)

Available in the 6-Pin Pb-Free SOT-26

and DFN 2x2 Packages

TYPICAL APPLICATION

V_IN

C_IN

1uF

V_OUT1

EN1

EN2 V_IN

VOUT2

V_OUT2

C_OUT2

VOUT1

GND

C_OUT1

1uF

APE8837A

1uF

ORDERING INFORMATION

Output Type Code : (V_OUT1+V_OUT2

)

APE8837 X X - HF

A : 1.5V+2.8V H : 2.8+3.0V

B : 1.8V+2.8V J : 2.8+3.3V

C : 1.8V+2.6V K : 3.0+3.0V

R : 3.3V+1.8V

T : 1.5V+3.3V

V : 1.5V+3.0V

Halogen Free

Output Type

Package

D : 1.8V+3.3V L : 3.0V+3.3V W : 1.2V+2.8V

E : 2.5V+2.8V M : 3.3+3.3V X : 1.2V+1.2V

(Refer Table) Y : SOT-26

GN2 : DFN 2x2

F : 2.8V+1.2V P : 1.8V+3.0V Y : 2.8V+1.5V

G : 2.8V+1.8V Q : 1.5V+2.5V

Table1.

Data and specifications subject to change without notice

201003171

Advanced Power

Electronics Corp.

APE8837

ABSOLUTE MAXIMUM RATINGS (at T_A=25°C)

Input Voltage (VIN) ----------------------------------------- GND - 0.3 to + 6V

Output Current (I_O1+I_O2) ----------------------------------- 500mA

Output Voltage (VOUT1/VOUT2) ----------------------- GND - 0.3 to VIN + 0.3

Enable Voltage (VEN1/VEN2) --------------------------- GND - 0.3 to VIN + 0.3

Power Dissipation (P_D) ------------------------------------- 250mW

Storage Temperature Range (T_ST) --------------------- -40 to 150°C

Operating Temperature Range (T_OP) ------------------ -40 to 85°C

Junction Temperature Range (T_J) ---------------------- -40 to 125°C

Thermal Resistance from Junction to case (Rth_jc)

180^oC/W

250^oC/W

Thermal Resistance from Junction to ambient (Rth )

Note. Rth_jais measured with the PCB copper area of approximately 1 in²(Multi-layer). That need connect to GND pin.

PACKAGE INFORMATION

VOUT1

VOUT2

GND

(Top View)

EN1

VIN

VOUT1

GND

APE8837

EN2

VOUT2

EN1

VIN EN2

SOT-26

DFN 2x2 (6L)

(TOP VIEW)

APE8837

ELECTRICAL SPECIFICATIONS ^(T_A^{=25℃, unless otherwise noted.)}

UNITS

Parameter

SYM

TEST CONDITION

MIN

TYP MAX

Input Voltage

V_IN

Note1.

2.5

5.5

I_OUT=1mA, V_IN=5V,V_OUT>2.0V

I_OUT=1mA, V_IN=5V,V_OUT≦2.0V

I_OUT1,2=0mA, V_IN=5V

-2

∆V_OUT

Output Voltage Accuracy

Quiescent Current

-0.04

0.04

100

I_CC

_OUT=0.2A, V_O=V_O-2%, V_OUT=1.5V

_OUT=0.2A, V_O=V_O-2%, V_OUT=1.8V

_OUT=0.2A, V_O=V_O-2%, V_OUT>2.5V

1000 1200

V_DROP

Dropout Voltage

700

300

900

400

I_LIMIT

I_SC

Current Limit (Note2)

Short Circuit Current

Line Regulation

250

V_IN=V_{OUT (T)}+ 1.0V, V_EN=V_IN

V_OUT<1.0V, each channel

I_OUT=1mA, V_IN=V_OUT+1V to 6.0V

I_OUT=1~100mA, V_IN=V_OUT+1V

F=120Hz, I_OUT= 30mA

150

0.2

0.01

+100

0.3

∆V_LINE

∆V_LOAD

PSRR

%/V

0.03

Load Regulation (Note 3)

Ripple Rejection

%/mA

Output Voltage Temperature Coefficient

I_OUT=30mA (Note 4)

PPM/ºC

V_ENH

V_ENL

I_EN

Enable Input Threshold

0.8

Enable Pull-high Current

Shutdown Current

V_EN1,2= 0V

ºC

I_SD

I_OUT1,2=0mA, V_IN=5V, V_EN1,2=0V

Thermal Shutdown Temperature

Thermal Shutdown Hysterisis

TST

TSH

150

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Electronics Corp.

APE8837

Note 1. V_{IN (min)}=V_OUT+V_DROP

Note 2. Current limit is measured at constant junction temperature by using pulsed testing with a low ON time.

Note 3. Regulation is measured at constant junction temperature by using pulsed testing with a low ON time.

Note 4. Guaranteed by design.

PIN DESCRIPTIONS

PIN SYMBOL

VIN

PIN DESCRIPTION

Input Voltage

GND

Common Ground Pin

VOUT1 Enable Control Pin

VOUT2 Enable Control Pin

Output1 Voltage

EN1

EN2

VOUT1

VOUT2

Output2 Voltage

BLOCK DIAGRAM

VIN

Current

Limit1

Current

Limit2

Thermal

Shutdown

Bandgap

VOUT1

GND

Error

Amp

VOUT2

Error

Amp

Enable2 Enable1

EN2

EN1

FUNCTION DESCRIPTION

The APE8837 is a highly accurate, dual, low noise, CMOS LDO voltage

regulators with enable function. The output voltage for each regulator is set

independently by fuse trimming. As illustrated in function block diagram, it consists of a

reference, error amplifier, a P-channel pass transistor, an ON/OFF control logic and an

internal feedback voltage divider. The band gap reference is connected to the error

amplifier, which compares the reference with the feedback voltage and amplifies the

voltage difference. If the feedback voltage is lower than the reference voltage, the

pass- transistor gate is pulled lower, which allows more current to pass to the V_OUTpin

and increases the output voltage. If the feedback voltage is too high, the pass

transistor gate is pulled up to decrease the output voltage. The output voltage is feed

back through an internal resistive divider connected to V_OUTpin. Additional blocks

include an output current limiter, thermal sensor, and shutdown logic.

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Electronics Corp.

APE8837

Enable Function

EN1 and EN2 pin start and stop the corresponding outputs independently. When

the EN pin is switched to the power off level, the operation of all internal circuit stops,

the build-in P-channel MOSFET output transistor between pins VIN and VOUT is

switched off, allowing current consumption to be drastically reduced.

Dropout Voltage

A regulator’s minimum input-output voltage differential, or dropout voltage,

determines the lowest usable supply voltage. The APE8837 use a P- channel

MOSFET pass transistor, its dropout voltage is function of drain-to-source on-

resistance R_{DS (ON)}multiplied by the load current.

V_DROPOUT= V_IN-V_OUT= R_DS(ON)x I_OUT

Current Limit

Each channel of APE8837 includes a fold back current limiter. It monitors and

controls the pass transistor’s gate voltage, estimates the output current, and limits the

output current within 250mA.

Thermal Shutdown Protection

Thermal Shutdown protection limits total power dissipation of APE8837. When

the junction temperature exceeds T_J= +150°C, a thermal sensor turns off the pass

transistor, allowing the IC to cool down. The thermal sensor turns the pass transistor

on again after the junction temperature cools down by 40°C, resulting in a pulsed

output during continuous thermal shutdown conditions.

Thermal shutdown protection is designed to protect the APE8837 in the event of fault

conditions. For continuous operation, the absolute maximum operating junction

temperature rating of T_J= +125°C should not be exceeded.

APPLICATION INFORMATION

Like any low-dropout regulator, the APE8837 requires input and output

decoupling capacitors. The device is specifically designed for portable applications

requiring minimum board space and smallest components. These capacitors must be

correctly selected for good performance (see Capacitor Characteristics Section).

Please note that linear regulators with a low dropout voltage have high internal loop

gains which require care in guarding against oscillation caused by insufficient

decoupling capacitance.

Input Capacitor

An input capacitance of 1µF is required between input pin and ground directly

(the amount of the capacitance may be increased without limit). The input capacitor

must be located less than 1cm from the device to assure input stability. A lower ESR

capacitor allows the use of less capacitance, while higher ESR type (like aluminum

electrolytic) requires more capacitance. Capacitor types (aluminum, ceramic and

tantalum) can be mixed in parallel, but the total equivalent input capacitance/ ESR

must be defined as above to stable operation. There are no requirements for the ESR

on the input capacitor, but tolerance and temperature coefficient must be considered

when selecting the capacitor to ensure the capacitance will be 1µF over the entire

operating temperature range.

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Electronics Corp.

APE8837

Output Capacitor

The APE8837 is designed specifically to work with very small ceramic output

capacitors. A ceramic capacitor (temperature characteristics X7R, X5R) in 1μF is

suitable for the APE8837 application. The recommended minimum capacitance for the

device is 1μF, X5R or X7R dielectric ceramic, between VOUT and GND for stability,

but it may be increased without limit. Higher capacitance values help to improve

transient. The output capacitor's ESR is critical because it forms a zero to provide

phase lead which is required for loop stability.

Thermal Considerations

The APE8837 series can deliver a current of up to 200mA/channel over the full

operating junction temperature range. However, the maximum output current must be

debated at higher ambient temperature to ensure the junction temperature does not

exceed 125°C. With all possible conditions, the junction temperature must be within

the range specified under operating conditions. Power dissipation can be calculated

based on the output current and the voltage drop across regulator.

P_D= (V_IN- V_OUT) I_OUT+ V_INx I_GND

The final operating junction temperature for any set of conditions can be

estimated by the following thermal equation:

P_{D (MAX)}= (T_{J (MAX)}- T_A) / θ_JA

Where T_{J (MAX)}is the maximum junction temperature of the die (125°C) and T_Ais

the maximum ambient temperature. The junction to ambient thermal resistance (θ_JA)

SOT-26 package at recommended minimum footprint is 250°C/W.

ADVANCED POWER ELECTRONICS CORP.

Package Outline : SOT-26

Millimeters

SYMBOLS

MIN

2.70

2.60

1.40

0.30

0.00

NOM

MAX

2.90

3.10

3.00

1.80

0.55

0.10

2.80

1.60

0.43

0.05

1.20REF

1.90REF

0.12REF

0.37REF

0.95REF

1.All Dimension Are In Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : SOT-26

Part Number : RP

Vout Code

(see the table1.)

RP&YY

Date Code

YY:2004,2008,2012…

YY:2003,2007,2011…

YY:2002,2006,2010…

YY:2001,2005,2009…

ADVANCED POWER ELECTRONICS CORP.

Package Outline : DFN 2x2-6L

Millimeters

NOM

0.85

SYMBOLS

MIN

0.80

0.00

0.20

MAX

1.00

0.05

0.30

－

0.25

0.195 0.203 0.211

1.95

0.55

1.95

1.15

2.00

0.60

2.05

0.65

2.05

1.25

2.00

1.20

0.65 (ref)

0.35

0.3

0.4

1.All Dimension Are In Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : DFN 2x2-6L

Part Number : RP

Vout Code (see the table1.)

RP&

YWS

Date Code (YWS)

Y:Year

W：Week

S：Sequence

Draw No. I1-N3S6-G-v00

APE8837 [A-POWER]

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