Anpec APW8824CTITRG Schematic [ru]

APW8824

1.5MHz, 1A Synchronous Buck Regulator

Features

• 1A Output Current

• Wide 2.7V~5.5V Input Voltage

• Fixed 1.5MHz Switching Frequency

• Low Dropout Operating at 100% duty cycle

• Low 25µA Quiescent Current

• Integrate Synchronous Rectifier

• 0.6V Low Reference Voltage

• <0.5µA Input Current during Shutdown

• Current-Mode Operation with Internal Compen-

sation

- Stable with Ceramic Output Capacitors

- Fast Line Transient Response

• Over-Voltage Protection

• Under Voltage Protection

• Over-Temperature Protection with Hysteresis

• Available in a TSOT-23-6A Package

• Halogen and Lead Free Available

(RoHS Compliant)

General Description

The APW8824 is a high efficiency monolithic synchro­nous buck regulator. APW8824 operates with a constant

1.5MHz switching frequenc y and using the inductor cur­rent as a controlled quantity in the current mode
architecture. The 2.7V to 5.5V input voltage range makes
the APW8824 ideally suited for single Li-Ion battery pow­ered applications. 100% duty cycle provides low dropout
operation, extending battery life in portable electrical
devices. The internally fixed 1.5MHz operating frequency
allows the use of small surface mount inductors and
capacitors. The synchronous switches inc luded inside
increase the efficienc y and eliminate the need for an ex­ternal Schottky diode.
The APW8824 is available in TSOT-23-6A package

Applications

• HD STB

• BT Mouse

• PND Instrument

• Portable Instrument

Simplified Application Circuit

L1

I

V

IN

IN

2.7~5.5V

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.2 - May., 2013

C1

10µF

(MLCC)

R3

100k

4

VIN

1

5

EN

APW8824

PG

GND

LX

FB

2

2.2µH

3

R1

C3

6

R2

(option)

R1 < 1.5MΩ is recommended
R2 < 200KΩ is recommended

C2
10µF
(MLCC)

V

OUT

0.6V~V
0~1A

IN

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APW8824

Ordering and Marking Information

APW8824

Assembly Material
Handling Code
Temperature Range
Package Code

APW8824 CT: X - Date Code

W24X

Package Code
CT : TSOT-23-6A
Operating Ambient Temperature Range
I : -40 to 85oC

Handling Code
TR : Tape & Reel

Assembly Material
G : Halogen and Lead Free Device

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

APW8824

EN 1

GND 2

LX 3

TSOT-23-6A Top View

6 FB
5 PG
4 VIN

Absolute Maximum Ratings (Note 1)

Symbol Parameter Rating Unit

VIN Input Bias Supply Voltage (VIN to GND) -0.3 ~ 7 V

VLX LX Voltage (LX to GND)

T

STG

T

SDR

Note 1: 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 in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.

Copyright  ANPEC Electronics Corp.
Rev. A.2 - May., 2013

EN, FB, LX and PG to GND Voltage

Maximum Junction Temperature
Storage Temperature
Maximum Lead Soldering Temperature (10 Seconds)

<30ns pulse width
>30ns pulse width

-0.3 ~ VIN+0.3 V

-3 ~ 8

-0.3 ~ VIN +0.3
150

-65 ~ 150
260

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V

o

C

o

C

o

C

APW8824

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.

Recommended Operating Conditions (Note 3)

Symbol Parameter Range Unit

VIN Input Bias Supply Voltage (VIN to GND) 2.7 ~ 5.5 V

V

OUT

I

OUT

L1

CIN

C

OUT

TA
TJ

Junction-to-Ambient Resistance in free air (Note 2) 220

Converter Output Voltage 0.6 ~ VIN V

Converter Output Current 0 ~ 1 A

Converter Output Inductor
Converter Input Capacitor
Converter Output Capacitor
Ambient Temperature
Junction Temperature

1.0 ~ 10
10 ~ 100
10 ~ 100

-40 ~ 85

-40 ~ 125

o

C/W

µH
µF
µF

o

o

C
C

Note 3: Refer to the application circ uit for further information

Electrical Characteristics

Unless otherwise specified, these specifications apply over VIN=3.6V and TA= -40 ~ 85 oC. Typical values are at TA=25oC.

Symbol

Parameter Test Conditions

SUPPLY VOLTAGE AND CURRENT

VIN Input Voltage Range
IDD Quiescent Current VFB = 0.66V - 25 40
ISD Shutdown Input Current EN = GND - - 0.5

POWER-ON-RESET (POR) and LOCKOUT VOLTAGE THRESHOLDS

UVLO Threshold 2.1 2.35 2.6 V
UVLO Hysteresis - 0.1 - V

REFERENCE VOLTAGE

V

Reference Voltage

REF

Output Voltage Accuracy 0A < I

IFB FB Input Current

TA = 25 oC 0.594 0.6 0.606
TA = -40~85 oC, TJ = -40~125 oC 0.591

< 1A, VIN > 3.6V, TJ =25 oC -1.5 - +1.5 %

OUT

INTERNAL POWER MOSFETS

FSW Switching Frequency VFB = 0.6V 1.2 1.5 1.8 MHz

R
R

Main Switch ON Resistance ILX=200mA - 0.28 0.35

P-FET

Synchronous Switch ON

N-FET

Resistance
N-FET Switch Leakage Current V
P-FET Switch Leakage Current V

ILX=200mA - 0.25 0.32

= GND, VLX = 5V -0.1 - 0.1

RUN

= GND, V

RUN

= 0V -0.1 - 0.1

LX

Copyright  ANPEC Electronics Corp.
Rev. A.2 - May., 2013

APW8824

Min Typ Max

2.7 - 5.5

- 0.609

-50 - 50 nA

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Unit

V

µA
µA

V
V

Ω
Ω

µA
µA

APW8824

Electrical Characteristics

Unless otherwise specified, these specifications apply over VIN=3.6V and TA= -40 ~ 85 oC. Typical values are at TA=25oC.

Symbol

Parameter Test Conditions

APW8824

Min Typ Max

INTERNAL POWER MOSFETS

Dead-time (Note 4) - 5 - ns
Duty Cycle 0 - 100 %

PROTECTION

I

I

Maximum Inductor Current Limit

LIM

N-FET Negative Current Limit - 1 - A

Over Voltage Protection

V

OVP

Threshold

, 2.7V≦VIN≦6V

P-FET

2 2.5 3 A

115 120 125 %V

OVP Debounce Time - 20 -

Under Voltage Protection

V

UVP

Threshold

57 66 75 %V

UVP Debounce Time - 15 -

PG in from Lower (PG Goes High) 87 90 93 %V

PG Threshold

PG Low Hysteresis (PG Goes Low) - 3 - %V
PG in from Higher (PG Goes High) 115 120 125 %V
PG High Hysteresis (PG Goes Low) - 3 - %V

PG High to Low debounce time

(V

under shoot)

OUT

PG High to Low debounce time

(V

over shoot)

OUT

T

Over-Temperature Protection TJ Rising - 150 - °C

OTP

- 60 -

- 80 -

START-UP AND SHUTDOWN

TSS Soft-start Duration (Note 4) - 0.7 - ms

EN Input High Threshold VIN = 2.7V~5.5V - - 1.5 V
EN Input Low Threshold VIN = 2.7V~5.5V 0.4 - - V
EN Leakage Current VEN = 5V, VIN = 5V -1 - 1

Power Good Pull Low

Resistance

Note 4: Guaranteed by design, not production tested.

- 200 -

Unit

REF

µs

REF

µs

REF

REF

REF

REF

µs

µs

µA

Ω

Copyright  ANPEC Electronics Corp.

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Rev. A.2 - May., 2013

APW8824

Typical Operating Characteristics

Output Voltage(V)

Output Voltage vs.

Temperature

1.525

Vout=1.5V

1.515

1.505

1.495

1.485

1.475

-40 -20 0 20 40 60 80 100 120 140 160

Temperature(oC)

Efficiency vs. Load Current

95

90

85

FSW=1.5MHz, V

OUT

=1.8V

VIN=3.3V
VIN=4.2V
VIN=5V

Switching Frequency vs

Temperature

1.6

1.55

1.5

1.45

1.4

Switching Frequency(MHz)

1.35

1.3

-40 -20 0 20 40 60 80 100 120 140 160

Temperature(oC)

Efficiency vs. Load Current

95

90

85

FSW=1.5MHz, V

OUT

=1.2V

VIN=3.3V
VIN=4.2V
VIN=5V

80

75

Efficiency (%)

70

65

60

0 0.2 0.4

0.6

Output Current (A)

0.8 1

80

75

Efficiency (%)

70

65

60

0 0.2 0.4 0.6 0.8 1

Output Current (A)

Copyright  ANPEC Electronics Corp.
Rev. A.2 - May., 2013

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APW8824

Operating Waveforms

Refer to the typical application circuit. The test condition is VIN=5V, TA= 25oC unless otherwis e specified.

1

2

3

I

L

4

CH1:VEN, 5V/Div
CH2:V
CH3:VPG , 5V/Div
CH3:IL, 1A/Div
TIME: 1ms/Div

OUT

, 1V/Div

Output Ripple

Enable

Shutdown

V

EN

V

EN

V

OUT

V

PG

1

V

OUT

2

3

4

I

L

V

PG

CH1: VEN, 5V/Div
CH2: V
CH3: V
CH4: IL, 1A/Div

OUT,
PG

1V/Div

5V/Div

TIME: 20µs/Div

Load Transient

V

OUT

1

V

LX

2

I

CH1: V
CH2: V

L

, 20mV/Div,AC

OUT

, 5V/Div

LX

3

CH3: IL , 1A/Div
TIME: 20µs/Div

Copyright  ANPEC Electronics Corp.
Rev. A.2 - May., 2013

1

2

3

CH1: V
CH2: VLX,5V/Div
CH3: I
TIME: 100µs/Div

, 100mV/Div,AC

OUT

,1A/Div

OUT

V

OUT

V

LX

I

OUT

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