Datasheet APW7037RC-TR, APW7037KC-TU, APW7037KC-TR, APW7037ARC-TU, APW7037ARC-TR Datasheet (ANPEC)

APW7037/A

8-PIN Synchronous Buck PWM Controller

Features

••

•

Operating with Single 5V or 12V Input

••

•

Drives N-Channel MOSFETs

••

•

Simple Single-Loop Control Design

••

− Voltage-Mode PWM Control

− Full 0% to 100% Duty Ratio

− Fast Transient Response

••

• ±2% Output Voltage Accuracy Over Temperature

••

• Under-Voltage Protection for Output

••

• 200kHz Constant Frequency Operation

••

(400kHz for APW7037A)

••

• Small size, 8-PIN Package (SOIC or TSSOP)

••

Applications

••

• Graphics Cards

••

• DDR Memory Power Supply

••

• DDR Memory Termination Voltage

••

General Description

The APW7037/A controller IC is designed to provide

a low cost synchronous Buck regulator for on-board

DC to DC converter applications. The APW7037 to-

gether with dual N-channel MOSFETs such as

APM7313, provide a low cost solution for such

applications. This device features an internal 200KHz

oscillator (400KHz for “A” version), Power-On-Reset

(POR) for both VCC and VC supplies, an external

programmable soft-start function as well as output

under-voltage detection that latches off the device

when an output short is detected.

Pin Description

1

VCC

LDRV

GND HDRV

2

3

45

8FB

SS

7

COMP

6

VC

••

• Low-Voltage Distributed Power Supplies

••

Ordering and Marking Information

APW7037/A

Handling Code

Temp. Range

Package Code

APW 7037/A K :

APW 7037/A R :

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.4 - May, 2003

APW 7037/A XXXXX

Package Code K : S O-8 R : TS SO P-8 Operating Junction Temp. Range C : 0 to 70°C Handling Code TU : Tube TR : Tape & R eel

XXXXX - Date Code

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APW7037/A

Block Diagram

SS

20uA

3.3V

Max . 64uA

Under-Voltage

V

FBUV

FB

25k

V

REF

Error Amp.

COMP

OSC

F

OSC

Absolute Maximum Ratings

4.5V Regulator

PW M

POR

Po w e r

On Reset

Gate

Control

VCC

VC

HDRV

VCC

LDRV

GND

Description Rating Unit

VCC to GND -0.2~30 V VC to GND -0.2~30 V Operating Junction Temperature 0~125 °C Storage Temperature -65~150 °C Soldering Temperature (10 Seconds) 300 °C Minimum ESD Rating ±2 kV

Thermal Characteristics

Symbol Parameter Value Unit

θ

JA

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

Thermal Resistance in Free Air 8-pin SOIC 8-pin TSSOP

160 124

°

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C/W

APW7037/A

Electrical Characteristics

Unless otherwise specified, these specifications apply over VCC=5V, VC=12V and TA=0 to 70°C. Typical values refer

A=25°C.

to T

APW7037/A Unit

Symbol Parameter Test Conditions

SUPPLY CURRENT

I

CCQ

I

VCC Dynamic Supply Current F

CC

I

VC Dynamic Supply Current F

C

VCC Static Supply Current

VC Static Supply Current SS=GND 0.2 0.4 1 mA

CQ

=200KHz, CL=1500pF 2 3 5 mA

OSC

=200KHz, CL=1500pF 2 5.5 8 mA

OSC

SS=GND

POWER-ON RESET

Rising VCC Threshold 4.0 4.2 4.4 V

VCC POR Hysteresis 0.25 V

Rising VC Threshold 3.1 3.3 3.5 V

VC POR Hysteresis 0.2 V

OSCILLATOR

F

V

∆

Free Running Frequency

OSC

Ramp Amplitude

OSC

1.10 V

APW7037

APW7037A

ERROR AMPLIFIER

I

FB Pin Input Bias Current SS=3V, VFB=1V

FB1

FB Pin Input Bias Current

FB2

SS=0V, V

FB

=1V

GM Transconductance 450 600 750

REFERENCE VOLTAGE

V

FB Pin Regulation Voltage

FB

APW7037

APW7037A

LREG VFB Line Regulation VCC = 5~12V 0.2 0.35 %

GATE DRIVERS

HDRV Rising Time CL = 1500pF 20 50 nS

HDRV Falling Time CL = 1500pF 15 50 nS

LDRV Rising Time CL = 1500pF 25 50 nS

LDRV Falling Time CL = 1500pF 25 50 nS

Dead Band Time 50 150 250

PROTECTION

V

FB Under-Voltage Threshold VFB Falling APW7037

FBUV

APW7037A

V

Shutdown Threshold Voltage Pull the voltage of SS pin 0.5 V

SD

Soft-Start Current SS=0 10 20 30

I

SS

Min. Typ. Max.

0.5 1.5 3 mA

180

360

200

400

220

440

1nA

-64

µ

1.225

0.784

0.4

0.3

1.250

0.800

0.6

0.4

1.275

0.816

0.8

0.5

KHz

A

µ

mho

V

nS

V

A

µ

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

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APW7037/A

Functional Pin Description

FB (Pin 1)

Connect this pin to the output (VOUT) of the PWM con-

verter via an external resistor divider to provide a volt-

age feedback path for the converter. The output volt-

age set by the resistor divider is determined using the

following formula :

OUT

R

()

VOUT = VREF x

1+

GND

R

where ROUT is the resistor connected from VOUT to FB

, and RGND is the resistor connected from FB to ground.

The voltage at this pin is also monitored for Under-

Voltage protection.

VCC (Pin 2)

Connect this pin to input voltage from 5V to 20V. This

pin provides the bias for the control circuitry and the

low-side power MOSFET driver (LDRV). The voltage

at this pin is monitored for Power-On Reset (POR)

purpose.

HDRV (Pin 5)

Connect this pin to the gate of the high-side power

MOSFET. This pin provides the gate drive for the

MOSFET.

VC (Pin 6)

This pin provides bias voltage to the high-side

MOSFET driver. A bootstrap circuit may be used to

pump a boot voltage for enforcing the driving capabil-

ity of the gate driver and improving the performance of

the MOSFET.

COMP (Pin 7)

This pin is the output of the error amplifier. Add an

external resistor-capacitor network to provide a loop

compensation for the PWM converter.

SS (Pin 8)

LDRV (Pin 3)

Connect this pin to the gate of the low-side power

MOSFET. This pin provides the gate drive for the

MOSFET.

GND (Pin 4)

Signal and power ground for the IC. All voltage levels

are measured with respect to this pin.

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

Connect a capacitor from this pin to ground.This

capacitor, along with an internal 20uA current source,

sets the soft-start interval of the PWM converter and

prevents the outputs from overshoot as well as limits

the input current. Pull this pin below 0.5V can shut-

down the converter.

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APW7037/A

Typical Applications

1. Dual supply voltage(5V and 12V) application

C1

1uF

2

VCC

Q2

AP M2300A

C7

0.1uF

8

SS

APW7037

Shutdown

7

COM P

R3 24k

C8

2200pF

2. Single supply voltage(5V) application

R4

3

U1

GND

+12V

V

C3

47uF

IN

+5V

V

OUT

VC

HDRV

C2

6

1uF

5

Q1A

AP M7313

C5

1uF

100uF

L4

3.3uH

C4

L3

1uH

1.5V/5 A

LDRV

3

Q1B

APM7313

C6,C9

2 x 150uF

R1

1

FB

4

249

R2

1.24k

C1

1uF

VCC

Q2

APM2300A

8

SS

C8

Shutdown

0.1uF

7

COM P

R3 24k

C9

2200pF

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

R4

3

D3

1N4148

2

U1

APW7037

GND

D2

1N4148

C6

1uF

C5

100uF

L3

1uH

C4

47uF

IN

V +5V

VC

D1

1N4148

C2

1uF

6

C3

HDRV

0.1uF

5

Q1A

APM7312

L4

3.3uH

OUT

V

1.5V/5 A

LDRV

3

Q1B

APM7312

C7,C10

2 x150uF

R1

1

FB

4

249

R2

1.24k

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APW7037/A

Typical Applications (Cont.)

3. LCD Monitor Application Circuit

R4

3

C11 1uF

C3

0.1uF

R9 12

R10

12

C8

0.1uF

R3 24k

C9

2200pF

7

8

C1

1uF

VCC

SS

AP W 7037

COM P

D2

1N4148

D1

1N4148

C2

U1

GND

6

1uF

VC

5

HDRV

3

LDRV

1

FB

4

2

R5

18k

R6

10k

APM7313

Q1A

Q1B

Q2

2N3904

C6

1uF

R8 0

R7 1k

U2

APL431

C5

470uF

L4

50uH

Ex tra Circuit for VIN>15V Application

C12

0.1uF

V

L3

1uH

C4

47uF

C7,C10

IN

9V~ 22V

V

OUT

5V / 0.2~ 5 A

2 x470uF

R1 3k

R2 1k

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

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APW7037/A

Package Information

SOP-8 pin ( Reference JEDEC Registration MS-012)

HE

0.015X45

e1 e2

D

A1

A

1

L

0.004max.

Dim

A 1.35 1.75 0.053 0.069

A1 0.10 0.25 0.004 0.010

D 4.80 5.00 0.189 0.197

E 3.80 4.00 0.150 0.157

H 5.80 6.20 0.228 0.244

L 0.40 1.27 0.016 0.050

e1 0.33 0.51 0.013 0.020

e2 1.27BSC 0.50BSC

18

φ

Millimeters Inches

Min. Max. Min. Max.

°

8

°

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

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APW7037/A

φ

Package Information

TSSOP-8

e

8

7

2 x E / 2

(2)

S

(L1)

GAUGE

PLANE

L

1

Dim

12

b

E1 E

e/2

D

A2

A

A1

0.25

(3)

Millimeters Inches

Min. Max. Min. Max.

A 1.2 0.047 A1 0.00 0.15 0.000 0.006 A2 0.80 1.05 0.031 0.041

b 0.19 0.30 0.007 0.012

D 2.9 3.1 0.114 0.122

e 0.65 BSC 0.026 BSC

E 6.40 BSC 0.252 BSC E1 4.30 4.50 0.169 0.177

L 0.45 0.75 0.018 0.030

L1 1.0 REF 0.039REF

R 0.09 0.004 R1 0.09 0.004

S 0.2 0.008

10 212 312

°

REF 12° REF

°

REF 12° REF

°

8

°

0

°

8

°

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

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APW7037/A

Physical Specifications

Terminal Material Solder-Plated Copper (Solder Material : 90/10 or 63/37 SnPb)

Lead Solderability Meets EIA Specification RSI86-91, ANSI/J-STD-002 Category 3.

Reflow Condition (IR/Convection or VPR Reflow)

Peak temperature

temperature

Pre-heat temperature

°

183 C

Time

Classification Reflow Profiles

Convection or IR/

Convection

Average ramp-up rate(183°C to Peak) 3°C/second max. 10 °C /second max. Preheat temperature 125 ± 25°C) Temperature maintained above 183°C Time within 5°C of actual peak temperature Peak temperature range Ramp-down rate Time 25°C to peak temperature

120 seconds max 60 – 150 seconds 10 –20 seconds 60 seconds 220 +5/-0°C or 235 +5/-0°C 215-219°C or 235 +5/-0°C 6 °C /second max. 10 °C /second max. 6 minutes max.

VPR

Package Reflow Conditions

pkg. thickness ≥≥≥≥ 2.5mm and all bgas

Convection 220 +5/-0 °C Convection 235 +5/-0 °C VPR 215-219 °C VPR 235 +5/-0 °C IR/Convection 220 +5/-0 °C IR/Convection 235 +5/-0 °C

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

pkg. thickness < 2.5mm and pkg. volume ≥≥≥≥ 350 mm³

pkg. thickness < 2.5mm and pkg. volume < 350mm³

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APW7037/A

Reliability test program

Test item Method Description

SOLDERABILITY MIL-STD-883D-2003 HOLT MIL-STD-883D-1005.7 PCT JESD-22-B, A102 TST MIL-STD-883D-1011.9 ESD MIL-STD-883D-3015.7 VHBM > 2KV, VMM > 200V Latch-Up JESD 78 10ms , Itr > 100mA

Carrier Tape & Reel Dimensions

245°C , 5 SEC 1000 Hrs Bias @ 125 °C 168 Hrs, 100 % RH , 121°C

-65°C ~ 150°C, 200 Cycles

t

Application

SOP-8

E

F

W

Po

A

P

P1

Ao

J

D

Bo

D1

T2

C

B

T1

Ko

A B C J T1 T2 W P E

330±1 62 ± 1.5

12.75 +0.15

2 + 0.5 12.4 +0.2

2± 0.2

12 + 0.3

- 0.1

8± 0.1 1.75± 0.1

F D D1 Po P1 Ao Bo Ko t

5.5 ± 0.1 1.55 ±+0.1

1.55+0.25

4.0 ± 0.1 2.0 ± 0.1 6.4 ± 0.1 5.2± 0.1 2.1± 0.1 0.3±0.013

Application A B C J T1 T2 W P E

330 ± 1 62 +1.5

12.75+

0.15

2 + 0.5 12.4 ± 0.2 2 ± 0.2 12± 0. 3 8± 0.1 1.75±0.1

F D D1 Po P1 Ao Bo Ko tTSSOP-8

5.5 ± 0. 1 1.5 + 0.1 1.5 + 0.1 4.0 ± 0.1 2.0 ± 0.1 7.0 ± 0.1 3.6 ± 0.3 1.6 ± 0.1 0.3±0.013

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

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(mm)

APW7037/A

Cover Tape Dimensions

Application Carrier Width Cover Tape Width Devices Per Reel

SOP- 8

TSSOP- 8

Customer Service

Anpec Electronics Corp.

Head Office :

5F, No. 2 Li-Hsin Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050

Taipei Branch :

7F, No. 137, Lane 235, Pac Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, R. O. C. Tel : 886-2-89191368 Fax : 886-2-89191369

12 9.3 2500 12 9.3 2500

Copyright  ANPEC Electronics Corp. Rev. A.4 - May, 2003

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