Anpec APW7138N, APW7138QA, APW7138QB Schematics

APW7138

High-Performance Notebook PWM Controller

Features

• Adjustable Output Voltage from +0.6V to +3.3V

- 0.6V Reference Voltage

- ±1% Accuracy Over Temperature

• Operates from an Input Battery Voltage Range of

+3V to +25V

• Wide Output Load Range from 0A to 25A

• Power-On-Reset Monitoring on VCC Pin

• Excellent Line and Load Transient Response

• PFM Mode for Increased Light Load Efficiency

• Programmable PWM Frequency from 200kHz to

600kHz

• Integrated MOSFET Drivers and Bootstrap Diode

• Internal Integrated Soft-Start and Soft-Stop

• Selectable Forced PWM or Automatic PFM/PWM

Mode (only for QFN4x4-16A and TQFN3x3-16 Packages)

• Power Good Monitoring

• Fault Identification by PGOOD Pull-Down

Resistance

• 70% Under-Voltage Protection (UVP)

• 124% Over-Voltage Protection (OVP)

• Adjustable Over-Current Protection (OCP)

- Sensing Low-Side MOSFET’s Current

• Over-Temperature Protection (OTP)

• SSOP-16, Compact 4mmx4mm QFN-16 (QFN4x4-

16A), and TQFN3x3-16 Packages

• Lead Free and Green Devices Available

(RoHS Compliant)

General Description

The APW7138 is a single-phase, constant-on-time, and synchronous PWM controller which drives N-channel MOSFETs. The APW7138 steps down high voltage of a battery to generate low-voltage chipset or RAM supplies in notebook computers. The APW7138 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Modulation (PFM) Mode, the APW7138 provides very high efficiency over light load with loadingmodulated switching frequencies. When the inductor current is continuous, the operation automatically enters PWM mode with relatively constant switching frequency. For QFN4x4-16A and TQFN3x3-16 packages, the ForcedPWM Mode works nearly at constant frequency for lownoise requirements. The APW7138 is equipped with accurate over-current, output under-voltage, and over-voltage protections perfect for NB application. A Power-On-Reset function monitors the voltage on VCC pin to prevent errorneous operation during power-on. The APW7138 has a digital softstart and soft-stop. The internal integrated soft-start ramps up the output voltage with controlled slew rate to reduce the start-up current. The digital soft-stop function actively discharges the output capacitors with controlled reverse inductor current. The APW7138 is available in SSOP-16, QFN4x4-16A, and TQFN3x3-16 packages.

Applications

• PCI Express Graphical Processing Unit

• Notebook Adapter

• Auxiliary Power Rail

• VRM

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.5 - Jul., 2010

Simpilfied Application Circuit

V

+3V~25V

L

IN

V

OUT

FCCM

(Only QFN)

R

FSET

VCC=5V

APW7138

EN

Q1

Q2

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APW7138

Ordering and Marking Information

APW7138

Assembly Material Handling Code Temperature Range Package Code

APW7138 N :

APW7138 QA :

APW7138 QB :

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).

APW7138 XXXX

APW 7138 XXXX

Package Code N : SSOP-16 QA: QFN4x4-16A QB: TQFN3x3-16 Operating Ambient Temperature Range I : -40 to 85 oC Handling Code TR : Tape & Reel Assembly Material G : Halogen and Lead Free Device

XXXXX - Date Code

Pin Configuration

VIN

VCC

EN

NC

FB

GND

1 2 3 4 5 6 7 8

SSOP-16

(TOP VIEW)

16

UG BOOT

15

PVCC

14 13

LG

12

PGND ISEN

11

VO

10

9

FSET

= Thermal Pad (connected to GND plane for better heat dissipation)

PHASE

PGOOD

Copyright  ANPEC Electronics Corp. Rev. A.5 - Jul., 2010

VIN

VCC

FCCM

EN

1 2 3 4

PHASE

PGOOD

NC

UG

1516 14 13

Metal

GND Pad

(Bottem)

65 7 8

FB

FSET

QFN4x4-16A

(TOP VIEW)

BOOT

12

PVCC

11

LG

10

PGND ISEN

9

VO

VIN

VCC

FCCM

EN

1 2 3 4

PHASE

UG

PGOOD

1516 14 13

Metal

GND Pad

(Bottem)

65 7 8

FB

NC

FSET

TQFN3x3-16

(TOP VIEW)

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BOOT

12

PVCC

11

LG PGND

10

ISEN

9

VO

APW7138

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

VIN Input Power Voltage (VIN to GND) -0.3 ~28 V

V

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

BOOT

V

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.

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

BOOT-GND

UG Voltage (UG to PHASE)

UG-PHASE

<400ns pulse width >400ns pulse width

LG Voltage (LG to PGND)

LG-PGND

<400ns pulse width >400ns pulse width

PHASE Voltage (PHASE to GND)

V

PHASE

<400ns pulse width >400ns pulse width

V

PGND to GND Voltage -0.3 ~ 0.3 V

PGND

V

ISEN Supply Voltage (ISEN to GND) -0.3 ~ 28 V

ISEN

V

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

PGOOD

V

All Other Pins (VO, FB, EN, FCCM and FSET to GND) -0.3 ~ VCC+0.3 V

I/O

-5 ~ V

-0.3 ~ V

BOOT

+0.3

-5 ~ VCC+0.3

-0.3 ~ VCC+0.3

-5 ~ 35

-2 ~ 28

TJ Maximum Junction Temperature 150

T

Storage Temperature Range -65 ~ 150

STG

T

Maximum Lead Soldering Temperature, 10 Seconds 260

SDR

V

°C °C °C

Thermal Characteristics (Note 2)

Symbol

Thermal Resistance -Junction to Ambient

θJA

Note 2: θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. The exposed pad of package is soldered directly on the PCB.

Parameter Typical Value Unit

SSOP-16

QFN4x4-16A

TQFN3x3-16

105

40 55

°C/W

Recommended Operating Conditions

Symbol Parameter Range Unit

VCC,V

Copyright  ANPEC Electronics Corp. Rev. A.5 - Jul., 2010

V

VIN

I

OUT

TA

TJ

VCC, PVCC Supply Voltage 4.5 ~ 5.5 V

PVCC

Converter Output Voltage 0.6 ~ 3.3 V Converter Input Voltage 3 ~ 25 V Converter Output Current 0 ~ 25 A Ambient Temperature -40 ~ 85 Junction Temperature -40 ~ 125

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o

C

o

C

APW7138

Electrical Characteristics

Refer to the typical application circuits. These specifications apply over VCC=5V, VIN=7~25V and TA= -40 ~ 85 °C, unless otherwise specified. Typical values are at TA=25°C.

Symbol

Parameter Test Conditions

SUPPLY CURRENT

I

VCC Input Bias Current VEN=5V, VFB=0.65V, VIN=7V to 25V - 1.7 2.5 mA

VCC

VCC Shutdown Current VEN=GND, VCC=5V - 0.1 1.0 PVCC Shutdown Current VEN=GND, V

I

VIN Input Bias Current

VIN

VEN=5V, VIN=7V - 6.5 10 VEN=5V, VIN=25V - 25 35

=5V - 0.1 1.0

PVCC

VIN Shutdown Current VEN=GND, VIN=25V - 0.1 1.0

POWER-ON-RESET (POR)

V

VCC_THR

Rising VCC POR Threshold Voltage 4.1 4.2 4.3 V

VCC POR Hysteresis - 0.2 - V

VOLTAGE REGULATION

V

Reference Voltage - 0.6 - V

REF

Regulation Accuracy Over Temperature -1 - +1 %

SWITCHING FREQUENCY

FSW Frequency Range DC Output Current 200 - 600 kHz

Frequency-Set-Accuracy

R

FSET

=44.5kΩ

PWM CONVERTERS

UG Minimum-Off Time Over temperature and VCC - 550 - ns VO Pin Input Impedance V

= 3.3V - 134 -

OUT

IFB FB Input Bias Current VFB=0.6V -0.5 - +0.5

TSS Soft-Start Time VEN High to V

Regulation

OUT

(Note3)

- 1.5 - ms

Zero-Crossing Voltage Threshold -5 0 +5 mV On-Time Ratio of PFM to PWM - 1.5 - -

POWER GOOD

R

I

PG_SS

R

I

PG_UV

R

PG_OV

R

PG_OC

I

PGOOD

PGOOD Pull-Down Impedance

I

PGOOD Leakage Current V

=5mA Sink (Soft-Start) 75 95 125

PGOOD

=5mA Sink (Under-Voltage) 75 95 125

PGOOD

=5mA Sink (Over-Voltage) 50 63 85

PGOOD

I

=5mA Sink (Over-Current) 25 32 45

PGOOD

=5V - 0.1 1.0

PGOOD

PGOOD Maximum Sink Current - 5.0 - mA PGOOD Soft-Start Delay VEN High to V

High 2.20 2.75 3.30 ms

PGOOD

MOSFET GATE DRIVERS

UG Pull-Up Resistance V UG Source Current V UG Sink Resistance V UG Sink Current V

=5V, IUG=0.1A - 1 2

BOOT

=5V, VUG-V

BOOT

=5V, IUG=0.1A - 1 2

BOOT

=5V, VUG-V

BOOT

=2.5V - 2 - A

PHASE

=2.5V - 2 - A

PHASE

APW7138

Min. Typ. Max.

Unit

µA µA µA µA µA

270 300 330 kHz

kΩ

µA

Ω Ω Ω Ω

µA

Ω

Copyright  ANPEC Electronics Corp.

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Rev. A.5 - Jul., 2010

APW7138

Electrical Characteristics (Cont.)

Refer to the typical application circuits. These specifications apply over VCC=5V, VIN=7~25V and TA= -40 ~ 85 °C, unless otherwise specified. Typical values are at TA=25°C.

Symbol

Parameter Test Conditions

APW7138

Min. Typ. Max.

MOSFET GATE DRIVERS (CONT.)

LG Pull-Up Resistance V LG Source Current V LG Sink Resistance V LG Sink Current V

=5V, ILG=0.1A - 1 2

PVCC

=5V, VLG-V

PVCC

=5V, ILG=0.1A - 0.6 1.2

PVCC

=5V, VLG-V

PVCC

=2.5V - 2 - A

PGND

=2.5V - 3 - A

PGND

TD Dead Time - 20 - ns

BOOTSTRAP DIODE

VF Forward Voltage V

PVCC-VBOOT-GND

=5V, IF=2mA - 0.8 - V

IR Reverse Leakage VR=25V - 0.2 -

CONTROL INPUTS

V

FCCMTHR

V

FCCMTHF

V

FCCM High Threshold 2.0 - - V FCCM Low Threshold

EN High Threshold 2.0 - - V

ENR

EN Low Threshold - - 0.8 V

ENF

Only for QFN4x4-16A and TQFN3x3-16 packages

- - 0.8 V

EN Leakage VEN=5V - 0.1 1.0

PROTECTION

IOC ISEN OCP Threshold I

ISC ISEN Short-Circuit Threshold I

Sourcing 20 26 30

SEN

Sourcing - 50 -

SEN

VUV UVP Threshold 65 70 75 %

UVP Debounce Interval - 2 -

V

OVP Rising Threshold 119 124 129 %

OVR

V

OVP Falling Threshold 99 104 109 %

OVF

OVP Debounce Interval - 2 -

T

OTP Rising Threshold

OTR

OTP Hysteresis

Note 3: Guaranteed by design.

(Note 3)

- 150 -

(Note 3)

- 25 -

Unit

Ω

µA

µA µA

µs

o

C

o

C

Copyright  ANPEC Electronics Corp.

www.anpec.com.tw5

Rev. A.5 - Jul., 2010

APW7138

Typical Operating Characteristics

Output Voltage vs. Output Current

1.215 V

=1.2V

1.21

(V)

1.205

OUT

1.2

1.195

Output Voltage, V

1.190

1.185

OUT

V

=19V

IN1

V

=15V

IN1

V

=10V

IN1

0 1 2 3 4 5 6 7 8 9 10

Output Current, I

OUT

Reference Voltage Accuracy Over

Temperature

0.604

0.602

(V)

REF

0.6

0.598

(A)

Switching Frequency (300kHz)

345 335 325

(kHz)

SW

315 305 295 285 275 265

Switching Frequency, F

255

-40

Over Temperature

In PWM Mode DC Output Current

-20 0 20 40

Junction Temperature, TJ (oC)

Switching Frequency vs. V

330

In PWM Mode

(kHz)

SW

320

310

300

290

DC Output Current

60 80 100 120 140

IN

0.596

Reference Voltage, V

0.594

-40 -20 0

20 40 60 80

Junction Temperature, TJ (oC)

Switching Frequency vs.

Ouput Current

350

300

(kHz)

250

SW

200

150

100

Switching Frequency, F

Copyright  ANPEC Electronics Corp. Rev. A.5 - Jul., 2010

V

=1.2V, I

OUT

50

0

0 1 2 3 4 5 6 7 8 9 10

Output Current, I

OUT

rising

OUT

(A)

100

120 140

280

Switching Frequency, F

270

5 7 9 11 13 15 17 19 21 23 25

Input Voltage, VIN (V)

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APW7138

Operating Waveforms

Enable at Zero Initial Voltage of V

I

=5A

OUT

1

2 3

4

CH1: VEN (5V/div) CH2: V CH3: V CH4: V Time: 2ms/div

OUT PGOOD PHASE

(1V/div)

(5V/div) (10V/div)

Shutdown at I

OUT

=5A

OUT

Enable Before End of Soft-Stop

No Load

1

2 3

4

CH1: VEN (5V/div) CH2: V CH3: V CH4: V Time: 2ms/div

OUT PGOOD PHASE

(1V/div)

(5V/div)

(10V/div)

Shutdown with Soft-Stop at No Load

1

2

3

4

CH1: VEN (5V/div) CH2: V CH3: V CH4: V Time: 5ms/div

OUT PGOOD PHASE

(1V/div)

(5V/div)

(10V/div)

Copyright  ANPEC Electronics Corp. Rev. A.5 - Jul., 2010

1

2

3

4

CH1: VEN (5V/div) CH2: V CH3: V CH4: V Time: 5ms/div

OUT PGOOD PHASE

(1V/div)

(5V/div) (10V/div)

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APW7138

Operating Waveforms (Cont.)

Under-Voltage Protection

Short Circuit Test

1

2

3

4

CH1: IL (5A/div) CH2: V CH3: VLG (5V/div) CH4: V Time: 10µs/div

(20V/div)

UG

(1V/div)

OUT

Mode Transient From PWM to PFM

Mode Transient From PFM to PWM

I

=0.1A to 5A

OUT

1 2

3

4

CH1: V CH2: V CH3: V CH4: IL (5A/div)

(5V/div)

PGOOD

(10V/div)

PHASE

(AC, 100mV/div)

OUT

Time: 10µs/div

Load Transient

0A->5A->0A

I

=5A to 0.1A

OUT

1 2

3

4

CH1: V CH2: V CH3: V CH4: IL (5A/div)

(5V/div)

PGOOD

(10V/div)

PHASE

(AC, 100mV/div)

OUT

Time: 10µs/div

Copyright  ANPEC Electronics Corp. Rev. A.5 - Jul., 2010

I

OUT1

1 2

3

4

CH1: V CH2: V CH3: V CH4: IL (5A/div) Time: 50µs/div

rise/fall time=1us

(5V/div)

PGOOD

(10V/div)

PHASE

(AC, 100mV/div)

OUT

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APW7138

Operating Waveforms (Cont.)

Over-Current Protection

1

2

3

4

CH1: IL (5A/div) CH2: VUG (20V/div) CH3: VLG (5V/div) CH4: V Time: 50µs/div

OUT

(1V/div)

Operating at Light Load of 100mA

I

rises slowly

OUT

1

2

3

4

CH1: V CH2: V CH3: V CH4: IL (5A/div) Time: 20µs/div

Short Circuit Test

In PFM Mode

(5V/div)

PGOOD

(1V/div)

OUT

(10V/div)

PHASE

Operating at Heavy Load of 5A

In PFM Mode

1 2

3

4

CH1: V CH2: V CH3: V CH4: IL (2A/div)

(5V/div)

PGOOD

(AC, 100mV/div)

OUT1

(10V/div)

PHASE

Time: 20us/div

Copyright  ANPEC Electronics Corp. Rev. A.5 - Jul., 2010

1 2

3

4

CH1: V CH2: V CH3: V CH4: IL (5A/div) Time: 2µs/div

(5V/div)

PGOOD

(AC, 100mV/div)

OUT1

(10V/div)

PHASE

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