Anpec APW8807QB Schematics

APW8807

8A Synchronous Buck Converter

Features General Description

• Wide Input voltage Range from 6V to 28V

• Provide PWM Converter with Adjustable 0.6V to 5.

5V Output

- 0.6V Reference Voltage

- Excellent Line/Load Regulations about +1.5%
over temperature range at PWM Channel

• Built in POR Control Scheme Implemented

• 15mA 5V Voltage Output

• Constant On-Time Control Scheme with Frequency

Compensation for PWM Mode

• Built in Soft Start for PWM Output and Soft Stop

for PWM Output and LDO Output

• Integrated Bootstrap Forward P-CH MOSFET

• High Efficiency over Light to Full Load Range

(PWMs)

• Built in Power Good Indicators (PWM)

• Integrated 24mΩ at VCC=5V N-Channel MOSFET

For High Side

• Integrated 14mΩ at VCC=5V N-Channel MOSFET

For Low Side

• 60% Under-Voltage and 120% Over-Voltage

Protections (PWM)

• Fixed Current-Limit Protection at 11A Loading

(PWM)

• Over-Temperature Protection

• 3mmx3mm Thin QFN-16A (TQFN3x3-16A) package

• Lead Free and Green Device Available (RoHS

Compliant)

The APW8807 integrates the step-down, constant
on-time, synchronous PWM converter with 24Ω N­channel high side MOSFET and 14Ω N-channel low side
MOSFET, as well as various protections into a chip. The
PWM converter step down high voltage of a battery to
generate low-voltage, for NB applications.
The APW8807 provides excellent transient response and
accurate DC output voltage in automatic PFM/PWM Mode.
In Pulse-Frequency Mode (PFM), the APW8807 provides
very high efficiency over light to heavy loads with loading­modulated switching frequencies. The PWM mode works
nearly at constant frequency for low-noise requirements.
The APW8807 is equipped with accurate sourcing
current-limit, output under-voltage, output over-voltage
protections, being perfect for NB applications. A 4.8ms
(Typ.) soft-start can reduce the start-up current. A soft­stop function actively discharges the output capacitors by
the discharge switch.
The APW8807 has enable control for PWM. Pulling the
EN pin low shuts down the PWM output. The APW8807 is
available in a TQFN3x3-16A package.

Simplified Application Circuit

EN

V

IN

BOOT

VCC

L

OUT

LX

POK

FB

V

OUT

AGND

APW8807

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 - Nov., 2013

www.anpec.com.tw1

APW8807

Applications

• Notebook and Sub-Notebook Computers

• Portable Devices

• DDR1, DDR2, and DDR3 Power Supplies

• 3-Cell and 4-Cell Li+ Battery-Powered Devices

• Graphic Cards

• Game Consoles

• Telecommunications

Ordering and Marking Information

APW8807

APW8807 QB:

Assembly Material

Handling Code

Temperature Range

Package Code

APW
8807
XXXXX

Package Code
QB : TQFN3x3-16A
Operating Junction Temperature

I : -40 to 85oC
Handling Code
TR : Tape & Reel

Assembly Material
G : Halogen and Lead Free Device

X - 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).

Pin Configuration

PGND

VIN

2

1

AGND

14

15 LX

9

LX

13
12
11
10

EN
FB

VCC

BOOT

NC

POK

NC
NC

VOUT

3
4
5
6

7

16 LX

8

LX

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Nov., 2013

TQFN 3 x 3 -16A

Top View

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APW8807

Absolute Maximum R atings (Note 1)

Symbol Parameter Rating Unit

VCC

VIN Input Power Voltage (VIN to GND) -0.3 ~ 30 V

V

BOOT

V

BOOT-GND

VLX

V

GND

TJ Maximum Junction Temperature 150

T

STG

T

SDR

Note1: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recom­mended operating conditions" is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.

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

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

BOOT Supply Voltage (BOOT to GND) -0.3 ~ 37 V

LX Voltage (LX to GND)
<20ns pulse width

>20ns pulse width

-5 ~ 37

-0.3 ~ 30

All Other Pins (LDO, VCLK, ENLDO, EN, VOUT, POK to GND) -0.3 ~ VCC+0.3 V
AGND to PGND -0.3 ~ +0.3 V

Storage Temperature -65 ~ 150
Maximum Lead Soldering Temperature(10 Seconds) 260

V

o

C

o

C

o

C

Thermal Characteristics

Symbol Parameter Typical Value Unit

θJA

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

Junction-to-Ambient Resistance in free air

(Note 2)

TQFN3x3-16A

95

Recommended Operating Conditions (Note 3)

Symbol Parameter Range Unit

VIN

VCC VCC Supply Voltage 4.5 ~ 5.5 V

V

OUT_PWM

I

OUT_PWM

CIN PWM Converter Input Capacitor (MLCC) 10 ~

TA

TJ

Note 3: Refer to the typical application circuit.

PWM Converter Input Voltage 6 ~ 28 V

PWM Converter Output Voltage 0.6 ~ 5.5 V

PWM Converter Output Current 0~8 A

Ambient Temperature
Junction Temperature

-40 ~ 85

-40 ~ 125

°C/W

µF

o

C

o

C

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Nov., 2013

www.anpec.com.tw3

APW8807

Electrical Characteristics

Unless otherwise specified, these specifications apply over VCC=5V, VIN=12V and TA= -40 to 85 oC. Typical values are
at TA=25oC.

Symbol

Parameter Test Condition

Min.

APW8807

Typ. Max. Unit

VOUT PIN AND VOUT VOLTAGE

V

Output Voltage Setting Range 0.6 -

OUT

5.5 V

REF voltage - 0.6 -

TA = 25 oC -0.5 - +0.5 %

Regulation Accuracy

R

VOUT Discharge Resistance EN=0V, V

DIS

TA = -40 oC ~ 85 oC, Line & Load
Regulations

=0.5V - 80

OUT

-1.5 - +1.5 %

SUPPLY CURRENT

I

VIN_PWM

I

VIN_PFM

I

VIN_SD

VIN Supply Current at PWM
Mode

VIN Supply Current at PFM
Mode

VIN Supply Current at
Shutdown Mode

VOUT=5.5V, EN=5V, I

VOUT=5.5V, EN=5V, I

=3A 1.53 A

OUT

=0A - 80 100

OUT

EN=0V - - 10

ON-TIME TIMER AND INTERNAL SOFT START AND ZERO CROSSING

FSW Switching Frequency at PWM VIN=12V, V

T

ON(MIN)

T

OFF(MIN)

- 100 - ns
Minimum off time VFB=0.55V, V

TSS Internal Soft Start Time EN High to V
VZC

Zero Crossing Comparator
Offset

V

GND-VLX

=5.05V 450 500 550 kHz

OUT

=-0.1V 200 300 400 ns

PHASE

Regulation 95% - 4.8 - ms

OUT

-5 - 5 mV

INTERNAL POWER MOSFETS AND DEAD TIME

R

DS(ON)_H

R

DS(ON)_L

High Side N-MOSFET
Resistance

Low Side N-MOSFET
Resistance

VCC=5V - 24 30

VCC=5V - 14 18

BOOTSTRAP SWITCH

VF Ron V

IR Reverse Leakage

VCC

V

BOOT-GND

V

VCC

– V

, IF = 10mA - 0.15 0.25 V

BOOT-GND

= 30V, VLX = 25V,

= 5V

- - 0.5

VCC POR THRESHOLD

V

POR_VCC

VCC POR Threshold Voltage 4.25 4.35 4.45 V

VCC POR Hysteresis - 100 - mV

CONTROL INPUTS

EN Leakage EN=0V - 0.1 1.0

EN Low Threshold EN falling 1.05 1.35 1.65 V
Hys. - 200 - mV

Ω

µA

µA

Ω

Ω

µA

µA

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Nov., 2013

www.anpec.com.tw4

APW8807

Electrical Characteristics(Cont.)

Unless otherwise specified, these specifications apply over VCC=5V, VIN=12V and TA= -40 to 85 oC. Typical values are
at TA=25oC.

Symbol

Parameter Test Condition

Min.

APW8807

Typ. Max. Unit

POWER-OK INDICATOR

V

POK Threshold

POK

I

POK Leakage Current V

POK

POK Sink Current V

POK in from Lower (POK Goes
High)

POK Low Hystersis - 3 - %
POK out from Normal high

threshold (POK Goes Low)

=5V - 0.1 1.0

POK

=0.5V 2 4 - mA

POK

87 90 93 %

115 120 125 %

POK Out Debounce Time1 When enter 120% threshold - 2 ­ POK Out Debounce Time2 When enter 87% threshold - 16 ­ POK Enable Delay Time From EN High to POK High - 5.3 - ms

PROTECTION

ICL Low Side Current Limit Valley current 10 11 12 A

VUV UVP Threshold 55 60 65 %

UVP Debounce Interval - 2 ­ UVP Enable Delay EN high to UVP workable - 5.3 - ms

V

OVP Rising Threshold 115 120 125 %

OVP

HYS - 10 - %
OVP Propagation Delay VFB Rising, Over voltagee=10mV - 2 -

T

OTP Rising Threshold

OTP

OTP Hysteresis

(Note 5)

- 150 -

(Note 5)

- 40 -

VCC Regulator

µA

µs
µs

µs

µs

o

C

o

C

VCC Regulator Output Voltage

VCC Load Regulation

VIN=6V~28V, no load

Icc=15mA

4.8 5 5.2

- 5 -

V

%

Copyright  ANPEC Electronics Corp.

www.anpec.com.tw5

Rev. A.1 - Nov., 2013

APW8807

serves as the lower supply rail for the

Pin Description

PIN

NO. NAME

1 VIN

2

3, 5, 6

4 POK
7 VOUT

8,

9,15,16

10 BOOT

11 VCC

12 FB
13 EN PWM Enable. PWM is enabled when EN=1. When EN=0, PWM is in shutdown.

14 AGND Signal Ground for The IC.

PGND Power Ground of The LGATE Low-Side MOSFET Drivers.

NC No Connection

Battery voltage input pin. VIN powers linear regulators and is also used for the constant on-time PWM
on-time one-shot circuits. Connect VIN to the battery input and bypass with a 1µF capacitor for noise
interference.

Power-Good Output Pin of PWM. POK is an open-drain output used to indicate the status of the PWM
output voltage. Connect the POK in to +5V through a pull-high resistor.
PWM Output Voltage-Sense Input. The VOUT pin makes a direct measurement of the PWM output voltage.
VOUT is an input to the constant on-time PWM one-time one-shot circuit.

LX

Junction Point of The High-Side MOSFET Source, Output Filter Inductor and The Low-Side MOSFET Drain
for PWM. Connect this pin to the Source of the high-side MOSFET. LX
UGATE high-side gate driver. LX is the current-sense input for the PWM.

Supply Input for The UGATE 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.

Output for internal 5V linear regulator. It can be also connected +5V from external supply voltage for Control
Circuitry. Decoupling at least 1µF of a MLCC capacitor from the VCC pin to the GND pin..

Output voltage feedback pin (PWM). It can use a resistive divider from VOUT to GND to adjust the output
from 0.6V to 5.5V.

FUNCTION

Copyright  ANPEC Electronics Corp.
Rev. A.1 - Nov., 2013

www.anpec.com.tw6