Anpec APW8814 Schematics

APW8814

High-Performance Notebook PWM Controller

Features General Description

• Adjustable Output Voltage from +0.75V to +5.5V

- 0.75V Reference Voltage

- ±1% Accuracy Over-Temperature

• Operates from An Input Battery Voltage Range of

+1.8V to +28V

• Power-On-Reset Monitoring on VCC Pin and PVCC

Pin

• Excellent Line and Load Transient Responses

• PFM Mode for Increased Light Load Efficiency

• Programmable PWM Frequency from 100kHz to

500kHz

• Integrated MOSFET Drivers

• Integrated Bootstrap Forward P-CH MOSFET

• Adjustable Integrated Soft-Start and Soft-Stop

• Selectable Forced PWM or Automatic PFM/PWM

Mode

• Power Good Monitoring

• 70% Under-Voltage Protection

• 125% Over-Voltage Protection

• Adjustable Current-Limit Protection

- Using Sense Low-Side MOSFET’s R

DS(ON)

• Over-Temperature Protection

• TQFN3x3-16 Package

• Lead Free and Green Devices Available

(RoHS Compliant)

The APW8814 is a single-phase, constant-on-time,
synchronous PWM controller, which drives N-channel
MOSFETs. The APW8814 steps down high voltage to
generate low-voltage chipset or RAM supplies in notebook
computers.
The APW8814 provides excellent transient response and
accurate DC voltage output in either PFM or PWM Mode.
In Pulse Frequency Mode (PFM), the APW8814 provides
very high efficiency over light to heavy loads with loading­modulated switching frequencies. In PWM Mode, the
converter works nearly at constant frequency for low-noise
requirements.
The APW8814 is equipped with accurate positive current­limit, output under-voltage, and output over-voltage
protections, perfect for NB applications. The Power-On­Reset function monitors the voltage on VCC and PVCC to
prevent wrong operation during power-on. The APW8814
has a 1.2ms digital soft-start and built-in an integrated
output discharge device for soft-stop. An internal
integrated soft-start ramps up the output voltage with
programmable slew rate to reduce the start-up current. A
soft-stop function actively discharges the output
capacitors.
The APW8814 is available in 16pin TQFN package
respectively.

Simplified Application Circuit

Applications

• Notebook

• Table PC

• Hand-Held Portable

• AIO PC

R

OCSET

TON

VCC

PHASE

OCSET
EN

R

TON

UGATE

PHASE

LGATE

Q1

Q2

V

IN

V

L

OUT

APW8814

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011

www.anpec.com.tw1

APW8814

Pin Configuration

EN

TON

NC

BOOT

16

15

1

OUT

V

C

C

V

2

B

F

3

O

K

P

4

5
NC

TQFN3x3-16

(Top View)

Ordering and Marking Information

13

14

12
11
10

8

7

6

GND

PGND

LGATE

T

E

G

A

U

E

PHA

S

CSE

T

O

C

C

P

V

9

APW8814

Assembly Material
Handling Code
Temperature Range
Package Code

APW

APW8814 QB : XXXXX - Date Code

Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020D for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).

8814
XXXXX

Package Code
QB : TQFN3x3-16
Temperature Range
I : -40 to 85 oC
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device

Absolute Maximum Ratings (Note 1)

Symbol Parameter Rating Unit

VCC VCC Supply Voltage (VCC to GND) -0.3 ~ 7 V

V

PVCC Supply Voltage (PVCC to GND) -0.3 ~ 7 V

PVCC

V

V

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011

BOOT Supply Voltage (BOOT to GND or PGND) -0.3 ~ 35 V

BOOT-GND

OCSET Supply Voltage (OCSET to GND or PGND) -0.3 ~ 35 V

OCSET-GND

V

BOOT Supply Voltage (BOOT to PHASE) -0.3 ~ 7 V

BOOT

All Other Pins (VOUT, TON, EN and FB to GND) -0.3 ~ VCC+0.3 V

UGATE Voltage (UGATE to PHASE)

<400ns Pulse Width

>400ns Pulse Width

LGATE Voltage (LGATE to GND)

<400ns Pulse Width
>400ns Pulse Width

-5 ~ V

-0.3 ~ V

-5 ~ VCC+0.3

-0.3 ~ VCC+0.3

BOOT

BOOT

+0.3

+0.3

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V

V

APW8814

Absolute Maximum Ratings (Note 1) (Cont.)

Symbol Parameter Rating Unit

V

PHASE

<400ns Pulse Width

>400ns Pulse Width

PHASE Voltage (PHASE to GND)

V

POK Supply Voltage (POK to GND) -0.3 ~ 7 V

POK

V

PGND to GND Voltage -0.3 ~ 0.3 V

PGND

TJ Maximum Junction Temperature 150

T

Storage Temperature -65 ~ 150

STG

T

Maximum Soldering Temperature, 10 Seconds 260

SDR

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.

Thermal Characteristics

Symbol Parameter Typical Value Unit

θJA

Note 2: θJA are measured with the component mounted on a high effective the thermal conductivity test board in free air. The exposed

Thermal Resistance-Junction to Ambient

pad of package is soldered directly on the PCB.

(Note2)

TQFN3x3-16

-5 ~ 35

-1 ~ 28

40

V

o

C

o

C

o

C

°C/W

Recommended Operating Conditions (Note 3)

Symbol Parameter Range Unit

VIN

Converter Input Voltage 1.8 ~ 28 V

VCC, PVCC VCC, PVCC Supply Voltage 4.5 ~ 5.5 V

V

OUT

TA
TJ

Note 3: Refer to the typical application circuit.

Converter Output Voltage 0.75 ~ 5.5 V
Ambient Temperature -40 ~ 85
Junction Temperature -40 ~ 125

o

o

C
C

Electrical Characteristics

These specifications apply for TA=-40°C to +85°C, unless otherwise stated. All typical specifications TA=+25°C, VCC=5V,
V

=5V.

PVCC

Symbol Parameter Test Conditions

VOUT AND VFB VOLTAGE

V

Output Voltage Adjustable output range 0.75 - 5.5 V

OUT

V

Reference Voltage - 0.75 - V

REF

TA = 25 oC -0.5 - +0.5 %

Regulation Accuracy

TA = 0 oC ~ 85 oC -0.8 - +0.8 %
TA = -40 oC ~ 85 oC -1.0 - +1.0 %

IFB FB Input Bias Current FB = 0.75V - 0.02 0.1

R

VOUT Discharge Resistance EN = 0V, V

DIS

= 0.5V - 20 50

OUT

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011

APW8814

Min. Typ. Max.

www.anpec.com.tw3

Unit

µA

Ω

APW8814

Electrical Characteristics (Cont.)

These specifications apply for TA=-40°C to +85°C, unless otherwise stated. All typical specifications TA=+25°C, VCC=5V,
V

=5V.

PVCC

Symbol

Parameter Test Conditions

SUPPLY CURRENT

VCC Plus PVCC Current, PWM,
EN = Float, VFB = 0.77V,

I

VCC Input Bias Current

VCC

PHASE = -0.1V
VCC Plus PVCC Current, PFM,

EN = 5V, VFB = 0.77V,
PHASE = 0.5V

I

VCC_SHDN

I

VCC_SHDN

VCC Shutdown Current EN = GND, VCC = 5V - 4.5 7.5
PVCC Shutdown Current EN = GND, PVCC = 5V - 0 1.0

ON-TIME TIMER AND INTERNAL SOFT-START

T

Nominal On Time

ONN

T

ON(MIN)

T

OFF(MIN)

Minimum On Time 80 110 140 ns
Minimum Off Time

VIN = 15V, V
R

= 1MΩ

TON

VFB = 0.7V, V
OCSET = OPEN

TSS Internal Soft-Start Time From EN = High to V

= 1.25V,

OUT

= -0.1V,

PHASE

= 95% 0.9 1.2 1.5 ms

OUT

GATE DRIVER

UG Pull-Up Resistance BOOT-UG = 0.5V - 5 7
UG Sink Resistance UG-PHASE = 0.5V - 1 2.5
LG Pull-Up Resistance PVCC-LG = 0.5V - 5 7
LG Sink Resistance LG-PGND = 0.5V - 0.9 2.5
UG to LG Dead Time UG falling to LG rising, no load - 40 - ns
LG to UG Dead Time LG falling to UG rising, no load - 40 - ns

BOOTSTRAP SWITCH

VF Ron V

IR Reverse Leakage

PVCC

V

BOOT-GND

V

PVCC

- V

BOOT-GND

= 30V, V

= 5V

, IF = 10mA - 0.5 0.8 V

= 25V,

PHASE

VCC POR THRESHOLD

V

PVCC_THR

V

VCC_THR

Rising PVCC POR Threshold
Voltage

Rising VCC POR Threshold
Voltage

4.2 4.35 4.45 V

4.2 4.35 4.45 V

VCC POR Hysteresis - 100 - mV

CONTROL INPUTS

EN High Threshold 2.5 2.65 2.8 V
Hysterisis 100 175 225 mV
EN Float Threshold 1.37 1.95 2.39 V
EN Low Threshold 0.7 1.0 1.3 V
Hysterisis 150 200 250 mV

EN Leakage

EN = 0V - 0.1 1.0
EN = 5V - - 2.0

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011

APW8814

Min.

Typ. Max.

- 400 750

- 250 520

Unit

µA

µA

µA
µA

253 316 379 ns

350 450 550 ns

- - 0.5

µA

µA

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Ω
Ω
Ω
Ω

APW8814

Electrical Characteristics (Cont.)

These specifications apply for TA=-40°C to +85°C, unless otherwise stated. All typical specifications TA=+25°C, VCC=5V,
V

=5V.

PVCC

Symbol

Parameter Test Conditions

POWER-OK INDICATOR

POK in from Lower (POK Goes High)

V

POK Threshold

POK

POK Low Hysteresis (POK Goes Low)
POK out from Normal (POK Goes Low) 120 125 130 %

I

POK Leakage Current V

POK

POK Sink Current V

= 5V - 0.1 1.0

POK

= 0.5V 2.5 7.5 - mA

POK

POK Debounce Time 43 63 85
POK Enable Delay Time EN High to POK High 1.4 2.0 2.6 ms

CURRENT SENSE

I

OCSET

T

CIOCSET

V

ROCSET

I

OCP Threshold I

OCSET

I

Temperature

OCSET

Coefficient
Current-Limit Threshold

Setting Range
Over Current-Limit

Comparator Offset
Zero Crossing Comparator

Offset

Sourcing 18 20 22

OCSET

On The Basis of 25°C - 4500 - ppm/ oC
V

OCSET-GND

Voltage, Over All

Temperature
(V

OCSET-GND-VPGND-PHASE

V
V

OCSET-GND

PGND-PHASE

= 60mV

Voltage, EN = 3.3V -9.5 0.5 10.5 mV

) Voltage,

PROTECTION

VUV UVP Threshold 60 70 80 %

UVP Hysteresis - 3 - %
UVP Debounce Interval - 16 ­ UVP Enable Delay EN High to UVP workable 1.4 2 2.6 ms

V

OVP Rising Threshold 120 125 130 %

OVR

OVP Propagation Delay VFB Rising, DV = 10mV - 1.5 -

T

OTP Rising Threshold

OTR

OTP Hysteresis

(Note 4)

- 160 -

(Note 4)

- 25 -

Note 4: Guaranteed by design.

Min.

APW8814

Typ. Max.

Unit

87 90 93 %

- 3 - %

µA

µs

µA

30 - 200 mV

-10 0 10 mV

µs

µs

o

o

C
C

Copyright  ANPEC Electronics Corp.

www.anpec.com.tw5

Rev. A.1 - Jun., 2011

APW8814

Pin Description

PIN

NO.

TQFN3x3-16

1 VOUT

2 VCC

3 FB

4 POK
6 GND Signal Ground for The IC.
7 PGND

8 LGATE

9 PVCC

10 OCSET

11 PHASE

12 UGATE Output of The High-side MOSFET Driver. Connect this pin to Gate of the high-side MOSFET.
13 BOOT

5,14 NC No Internal Connection

15 EN

16 TON

NAME

The VOUT Pin Makes a Direct Measurement of The Converter Output Voltage. The VOUT pin
should be connected to the top feedback resistor at the converter output.

Supply Voltage Input Pin for Control Circuitry. Connect +5V from the VCC pin to the GND pin.
Decoupling at least 1µF of a MLCC capacitor from the VCC pin to the GND pin.

Output Voltage Feedback Pin. This pin is connected to the resistive divider that set the desired
output voltage. The POK, UVP, and OVP circuits detect this signal to report output voltage status.

Power Good Output. POK is an open drain output used to indicate the status of the output voltage.
Connect the POK into +5V through a pull-high resistor.

Power Ground of The LG Low-side MOSFET Driver. Connect the pin to the Source of the low-side
MOSFET.

Output of The Low-side MOSFET Driver. Connect this pin to Gate of the low-side MOSFET. Swings
from PGND to VCC.

Supply Voltage Input Pin for The LG Low-side MOSFET Gate Driver. Connect +5V from the PVCC
pin to the PGND pin. Decoupling at least 1µF of a MLCC capacitor from the PVCC pin to the PGND
pin.

Current-Limit Threshold Setting Pin. There is an internal source current 20µA through a resistor
from OCSET pin to PHASE. This pin is used to monitor the voltage drop across the Drain and
Source of the low-side MOSFET for current-limit.

Junction Point of The High-side MOSFET Source, Output Filter Inductor And The Low-side
MOSFET Drain. Connect this pin to the Source of the high-side MOSFET. PHASE serves as the
lower supply rail for the UG high-side gate driver.

Supply Input for The UG Gate Driver And An Internal Level-shift Circuit. Connect to an external
capacitor to create a boosted voltage suitable to drive a logic-level N-channel MOSFET.

Enable Pin of The PWM Controller. When the EN is above high logic level, the Device is in
automatic PFM/PWM Mode. When the EN is floating, the device is in force PWM mode. When the
EN is below low logic level, the device is in shutdown and only low leakage current is taken from VCC
and VIN.

This Pin is Allowed to Adjust The Switching Frequency. Connect a resistor R
from TON pin to VIN.

FUNCTION

TON

=400kΩ ~ 1500kΩ

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011

www.anpec.com.tw6

APW8814

Typical Operating Characteristics

0.760

(V)

REF

0.755

0.750

0.745

Reference Voltage Accuracy, V

0.740

(kHz)

SW

1000

100

Reference Voltage Accuracy vs.

Junction Temperature

-50 -30 10 50 90 1107030-10
Junction Temperature, TJ ( oC )

Switching Frequency vs.

Converter Output Current

Forced-PWM

Mode

10

OCSET Sourcing Current vs.

Junction Temperature

26

24

22

20

18

16

OCSET Sourcing Current, IOCSET (µA)

14

-50 -30 10 50 90 110 1507030-10 130
Junction Temperature, TJ ( oC )

Converter Output Voltage vs.

1.070

(V)

OUT

1.060

Converter Output Current

Automatic

PFM/PWM Mode

↓

1.050

VIN=19V,

V

=1.05V,

OUT

FSW=200kHz

1

Switching Frequency, F

Automatic

PFM/PWM

Mode

0.1

0.001 0.01 0.1
Converter Output Current, I

Switching Frequency vs. TON Resistance

800

700

VIN=19V, Forced-PWM Mode

(kHz)

SW

600

500

V

400

OUT

=2.5V

↓

300

200

Switching Frequency, F

100

400

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011

↑

V

=1.05V

OUT

TON Resistance, R

1

TON

(kΩ)

VIN=19V,

V

=1.05V,

OUT

FSW=300kHz

10

(A)

OUT

1600140012001000800600

100

↑

1.040

Converter Output Voltage, V

1.030
0

Converter Output Current, I

Forced-PWM

Mode

OUT

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987654321 10

(A)

APW8814

Operating Waveforms

Refer to the typical application circuit. The test condition is VIN=19V, TA= 25oC unless otherwise specified.

Enable at Zero Initial Voltage of V

I

=5A

LOAD

1

2

3

4

CH1: VEN, 5V/Div, DC
CH2: V
CH3: V
CH4: V

, 500mV/Div, DC

OUT

, 20V/Div, DC

PHASE

, 5V/Div, DC

POK

TIME: 1ms/Div

Shutdown at I

OUT

=5A

OUT

Enable Before End of Soft-Stop

No Load

1

2

3

4

CH1: VEN, 5V/Div, DC
CH2: V
CH3: V
CH4: V

, 500mV/Div, DC

OUT

, 20V/Div, DC

PHASE

, 5V/Div, DC

POK

TIME: 1ms/Div

Shutdown with Soft-Stop at No Load

1

2
3

4

CH1: VEN, 5V/Div, DC
CH2: V
CH3: V
CH4: V

, 500mV/Div, DC

OUT

, 20V/Div, DC

PHASE

, 5V/Div, DC

POK

TIME: 20μs/Div

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Jun., 2011

1

2
3

4

CH1: VEN, 5V/Div, DC
CH2: V
CH3: V
CH4: V

, 500mV/Div, DC

OUT

, 20V/Div, DC

PHASE

, 5V/Div, DC

POK

TIME: 20ms/Div

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