APE8981GN3-B-HF - Advanced Power Electronics Corp. USA

Advanced Power

Electronics Corp. APE8981

3A ULTRA LOW DROPOUT LINEAR REGULATOR

FEATURES DESCRIPTION

Ultra Low Dropout 0.21V(typical) @ 2A Output

Current for 1.2V Output Voltage

Low ESR Output Capacitor (Multi-layer Chip

Capacitors (MLCC)) Applicable

EN Pull-low for APE8981MP-A

EN Pull-high for APE8981MP-B

Fast Transient Response

Adjustable Output Voltage by External Resistors

Power-On-Reset Monitoring on Both VCNTL

and VIN Pins

Internal Soft-Start

Current-Limit and Thermal Shutdown Protection

Power-OK Output with a Delay Time

SO-8 with Exposed Pad Pb-Free &

DFN 3x3-10L Package.

Halogen Free Product

Data and specifications subject to change without notice

201204273

TYPICAL APPLICATION

The APE8981 series is a 3A ultra low dropout linea

regulator. This product is specifically designed to provide

well supply voltage for front-side-bus termination on

motherboards and NB applications. The IC needs two

supply voltages, a control voltage for the circuitry and a

main supply voltage for power conversion, to reduce powe

dissipation and provide extremely low dropout. The

APE8981 series integrates many functions. A Power-On-

Reset (POR) circuit monitors both supply voltages to

prevent wrong operations. A thermal shutdown and current

limit functions protect the device against thermal and

current over-loads. A POK indicates the output status with

time delay which is set internally. It can control othe

converter for power sequence.

The APE8981 series can be enabled by other powe

system. Pulling and holding the EN pin below 0.4V shuts of

the output.

The APE8981 series is available in DFN 3x3-10L &

ESOP-8 package which features small size as SO-8 and an

Exposed Pad to reduce the junction-to-case resistance.

POK

VIN

VCNTL NC

VOUT

GND

APE8981

1uF

4.7uF

10k

20k

10k

10uF

Cout

POK

*option

VOUT

VIN

VCNTL

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Electronics Corp. APE8981

ABSOLUTE MAXIMUM RATINGS (Note1)

CNTL Supply Voltage (VCNTL) --------------------------

-0.3V To 6.5V

Input Supply Voltage (VIN) ------------------------------

-0.3V To 6.5V

EN & FB Pin Voltage (VEN/VFB) ------------------------

-0.3V To VCNTL+0.3V

Power Good Voltage (VPOK) ---------------------------

-0.3V To 6.5V

Power Dissipation (PD) ---------------------------------

2.5W

Storage Temperature Range (TST) -------------------

-65°C To 150°C

Junction Temperature Range (TJ) --------------------

-40°C To 150°C

ESOP-8 ------

40°C/W

DFN 3x3-10L 62.5°C/W

Thermal Resistance Junction to Case (Rthjc)Note

ESOP-8 ------

15°C/W

DFN 3x3-10L 17°C/W

Note. mounted on a Demo board

RECOMMENDED OPERATING CONDITIONS

Operating Junction Temperature Range (TOJ) ----

-40°C To 125°C

Operating Ambient Temperature Range (TOA) ----

-40°C To 85°C

VCNTL Supply Voltage (VCNTL) ------------------------

3V To 6V

Input Supply Voltage (VIN) ------------------------------

1.1V To 5.5V

Output Voltage (VOUT)@VCNTL > VOUT + 2.5V ------

0.8V To 2.8V

Output Cunrrent (IOUT) -----------------------------------

0A To 3A

PACKAGE/ORDERING INFORMATIO

Thermal Resistance Junction to Ambient (Rthja)Note.

(Top View)

5NC

VOUT

ESOP-8

GND

FBEN

POK

VIN

VCNTL

GND

(Top View)

DFN 3x3-10L

GND

10VOUT

VOUT

POK EN

VIN

VCNTL

Package Type

MP : ESOP-8

GN3 : DFN 3x3-10L

APE8981X-X - HF

EN Function

A : In ternal Pull Low

B : In ternal Pull High

Halogen Free

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Electronics Corp. APE8981

ELECTRICAL SPECIFICATIONS

VCNTL= 5V, VIN=1.8V, VOUT=1.2V, TA=25oC unless otherwise specified

Parameter SYM TEST CONDITION MIN TYP MAX UNITS

VCNTL Operation Voltage VCNTL 2.8 - 5.5 V

VIN POR Threshold VIN 0.8 0.9 1 V

VIN POR Hysteresis VIN(hys) - 0.5 - V

VCNTL Nominal Supply Current ICNTL EN= VCNTL - 1.3 - mA

APE8981MP-A - - 1

APE8981MP-B - 10 30

VCNTL=3 ~ 6V, IOUT=10mA,

VIN=VOUT+0.5~5.5V

Load Regulation IOUT=0A ~ 2A - 0.5 1 %

IOUT=100mA, VCNTL=VEN=5.0V,

VOUT=1.2V

Dropout Voltage VDROP IOUT = 2A, VCNTL=5V, VOUT = 1.2V - 0.21 0.3 V

VOUT Pull Low Resistance EN=0V - 40 - Ω

Soft Start Time TSS - 0.2 - ms

VENH Enable 1.2 - -

VENL Disable - - 0.6

EN=5V, APE8981MP-A - 10 20

EN=GND, APE8981MP-B - 10 20

Current Limit ILIM VCNTL=5V, VIN=VOUT+1V 3.1 - - A

-65-

POK Threshold Voltage for Power OK VPOK VFB Rising 92% 94% 96% VFB

POK Threshold Voltage for Power Not OK VPNOK VFB Falling 83% 88% 91% VFB

POK Low Voltage POK sinks 5mA - - 0.1 V

POK Delay Time TDELAY 0.8 2 10 ms

Thermal Shutdown Threshold (Note1) TSD - 160 - oC

Thermal Shutdown Hysteresis (Note1) -40- oC

Note1: Guarantee by design, not production tested.

105

0.8

0.816 V

150 mΩ

EN Pin Logic High Threshold Voltage

On Resistance RDS(ON)

VCNTL Shutdown Current ISD uA

Feedback Voltage VFB 0.784

F=120Hz, IOUT=100mA

Ripple Rejection PSRR

EN Pin Pull-Up Current IEN

VCNTL

EN=0V

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Electronics Corp. APE8981

PIN DESCRIPTIONS

PIN SYMBOL PIN DESCRIPTION

POK Power OK Output Pin

Internal Pull High (APE8981MP-B) or Pull Low (APE8981MP-A)

EN=High or Floating → Enable

EN=Low → Shutdown Mode

VIN Power input pin of the control circuitry. The pin is monitored for Power-On Reset

purpose.

NC No Connect

VOUT Output Voltage

FB Feedback Pin

GND GND Pin

BLOCK DIAGRAM

APE8981MP-A

APE8981MP-B

Supply input for power conversion. The pin is monitored for Power-On Reset purpose.

VCNTL

VIN VOUT

GND

Error

Amp

VCNTL

Soft-Start

And

Control Logic

Power-ON

Reset

Current

Limit

Thermal

Shutdown

Bandgap

POKDelay

POK

94%

VREF

N-MOSFET

10uA

Enable

VIN VOUT

GND

Error

Amp

VCNTL

Soft-Start

And

Control Logic

Power-ON

Reset

Current

Limit

Thermal

Shutdown

Bandgap

POKDelay

POK

94%

VREF

N-MOSFET

10uA

Enable

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Electronics Corp. APE8981

PIN DESCRIPTION

VIN

VCNTL

POK

VOUT

FUNCTION DESCRIPTION

Power-On-Reset

Internal Soft-Start

Output Voltage Regulation

Connecting this pin to an external resistor divider receives the feedback voltage of the

regulator. The output voltage set by the resistor divider is determined by:

A Power-On-Reset (POR) circuit monitors both input voltages at VCNTL and VIN pins to

prevent wrong logic controls. The POR function initiates a soft-start process after the two supply

voltages exceed their rising POR threshold voltages during powering on. The POR function also

pulls low the POK pin regardless the output voltage when the VCNTL voltage falls below its falling

POR threshold.

An internal soft-start function controls rise rate of the output voltage to limit the current surge

at start-up. The typical soft-start interval is about 0.2ms.

An error amplifier working with a temperature compensated 0.8V reference and an output

NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth

and DC gain provides very fast transient response and less load regulation. It compares the

reference with the feedback voltage and amplifies the difference to drive the output NMOS which

provides load current from VIN to VOUT.

Where R1 is connected from VOUT to FB with Kelvin sensing and R2 is connected from FB

to GND. A bypass capacitor may be connected with R1 in parallel to improve load transient

response. The R2 range in 1K~4.7KΩfor AL output capacitor and 30K~100KΩfor MLCC output

capacitor are recommended.

Power input pin of the control circuitry. Connecting this pin to a +5V (recommended) supply

voltage provides the bias for the control circuitry. The voltage at this pin is monitored for Power-

On Reset purpose.

Power-OK signal output pin. This pin is an open-drain output used to indicate status o

output voltage by sensing FB voltage. This pin is pulled low when the rising FB voltage is not

above the VPOK threshold or the falling FB voltage is below the VPOK threshold, indicating the

output is not OK.

Enable control pin. Pulling and holding this pin below 0.4V shuts down the output. When re-

enabled, the IC undergoes a new soft-start cycle. For APE8981MP-B, this pin is internal pulled up

to VCNTL voltage, enabling the regulator. For APE8981MP-A, this pin is internal pulled down to

GND voltage, shutdown the regulator. The pull-high current is 10uA (typ.)

Output of the regulator. Please connect Pin 6 using wide tracks. It is necessary to connect

an output capacitor with this pin for closed-loop compensation and improving transient responses.

Main supply input pins for power conversions. The voltage at this pin is monitored for Power-

On Reset purpose.

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Electronics Corp. APE8981

FUNCTION DESCRIPTION

Current-Limit

Thermal Shutdown

APPLICATION INFORMATION

Capacitor Selection

A thermal shutdown circuit limits the junction temperature of APE8981. When the junction

temperature exceeds +160°C, a thermal sensor turns off the output NMOS, allowing the device to

cool down. The regulator regulates the output again through initiation of a new soft-start cycle

after the junction temperature cools by 40°C, resulting in a pulsed output during continuous

thermal overload conditions. The thermal shutdown designed.

Normally, use a MLCC capacitor on the input and output of the APE8981. Larger input

capacitor values provide better supply-noise rejection and transient response. A higher- value

output capacitor may be necessary if large, fast transients are anticipated and the device is

located several inches from the power source. The X5R and X7R type in MLCC is recommended.

For aluminum electrolytic capacitor application, 100uF in input capacitor and 220uF in output

capacitor (30mΩ< ESR < 200mΩ) are recommended. Output capacitor of larger capacitance

can reduce noise and improve load transient response, stability, and PSRR.

The APE8981 monitors the current via the output NMOS and limits the maximum current to

prevent load and APE8981 from damages during overload or short circuit conditions.

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Electronics Corp. APE8981

TYPICAL PERFORMANCE CHARACTERISTICS

Line Regulation

Dropout Voltage at VCNTL=5V Dropout Voltage at VCNTL=3.3V

ICNTL vs. TJICNTL-SD (APE8981MP-B) vs. TJ

Load Regulation

0.780

0.785

0.790

0.795

0.800

0.805

0.810

0.815

0.820

3 3.4 3.8 4.2 4.6 5

VCNTL (V)

VO (V)

Io=0mA

Io=1A

0.75

0.76

0.77

0.78

0.79

0.80

0.81

0.82

0.83

0.84

0.85

0 0.5 1 1.5 2 2.5 3

IOUT (A)

VO (V)

VCNTL=5

100

200

300

400

500

600

700

800

900

1000

0 0.5 1 1.5 2 2.5 3

IOUT (A)

VDROP (mV)

Vo=2.5V

Vo=1.8V

Vo=1.2V

Vo=1.05V

100

200

300

400

500

600

700

800

900

1000

0 0.5 1 1.5 2 2.5 3

IOUT (A)

VDROP (mV)

Vo=1.2V

Vo=1.05V

0.0

0.5

1.0

1.5

2.0

2.5

3.0

-40 -20 0 20 40 60 80

TJ (°C)

ICNTL (mA)

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

-40 -20 0 20 40 60 80

TJ (°C)

ICNTL-SD (uA)

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Electronics Corp. APE8981

TYPICAL PERFORMANCE CHARACTERISTICS

VEN VIN

VOUT VOUT

POK POK

IOUT=3A IOUT=3A

EN on with POK Delay VIN Power –ON

VFB vs. TJVEN vs. TJ

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

-40 -20 0 20 40 60 80

TJ (°C)

VEN (V)

VENH

VENL

0.70

0.72

0.74

0.76

0.78

0.80

0.82

0.84

0.86

0.88

0.90

-40 -20 0 20 40 60 80

TJ (°C)

VFB (V)

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Electronics Corp. APE8981

MARKING INFORMATION

ESOP-8

DFN 3x3-10L

Part Number

Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

Package Code

8981MP-X

YWWSSS EN Function

8981-X

YWWS

Part Number

Date Code (YWWS)

Y：Last Digit Of The Year

WW：Week

S：Sequence

EN Function