Diodes AP3591 User Manual

AP3591

Document number: DS36906 Rev. 1 - 2

1 of 18

www.diodes.com

March 2014

AP3591

NE W P R OD U CT

A Product Line of

Diodes Incorporated

Description

The AP3591 is a synchronous adaptive on-time buck controller providing high efficiency, excellent transient response and high DC output accuracy for low voltage regulation in notebook application.

The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and features small external component count and fast transient response.

The operation mode is selectable by EN voltage. A Diode Emulation Mode (DEM) is activated for increasing efficiency at light loads, while PWM mode is activated only for low noise operation. The AP3591 also integrates internal Soft-start, UVLO, OVP, OTP, and programmable OCP to protect the circuit. A Power Good signal is employed to monitor the output voltage.

The AP3591 is available in U-QFN3535-14 package.

Features

 Fixed Frequency Constant On-time Control; Resistor

Programmable Frequency Adjustable from 100kHz to 700kHz

 Good Stability Independent of the Output Capacitor ESR  Quick Load Step Response  Input Voltage Range: 4.5V to 26V  Output Voltage Range: 0.75V to 5.5V  CCM/DEM Mode Selection  Integrated Bootstrap Diode  Resistor Programmable Current Limit by Low-side R

DS_ON

Sense

 Integrated Negative Over Current Limit  Integrated OVP/UVP and Over Thermal Shutdown Function  Power Good Indicator  Internal Soft-start  Integrate Output Discharge (Soft-stop)  Safe Start-up into Pre-biased Loads  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

U-QFN3535-14

Applications

 Notebook Computer, AIO PC  Low-voltage Distribute Power  I/O Supplies

VOUT

VDD

FB

PGOOD

GND

PGND

LGATE

EN/DEM

TON

BOOT

UGATE PHASE

CS

VDDP

Pin 1 Mark

EP

1 14

2 3 4 5 6

7 8

9

10

11

12

13

SINGLE PHASE SYNCHRONOUS BUCK CONTROLLER

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen - and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.

AP3591

Document number: DS36906 Rev. 1 - 2

2 of 18

www.diodes.com

March 2014

AP3591

NE W P R OD U CT

A Product Line of

Diodes Incorporated

VDDP

BOOT

UGATE

LGATE

PHASE

VOUT

PGOOD

EN/DEM

FB

AP3591

13

14

12

9

5

4

GND

7

L

1.0

C

4

220

mF

R1

C2

C1

10

mF

TON

Q2

Q1

C3

0.1mF

R3

PGND

VDD

VDDP

CCM/ DEM

CS

mH

1

2

3

6

8

10

11

1

mF

C

Optional

10

R2

100K

250K

R4

18K

12K

R5

R6

30K

V

OUT

=1.05V

=12V

V

IN

Symbol

Value

Description

Manufacturer

Part Number

C1

10µF/25V

ESR < 4mΩ @400kHz

Murata

GRM31CR61E106KA12

C4

220µF/6.3V

ESR < 9mΩ @300kHz

Sanyo

6SVPE220M

L

1.0µH

DCR < 4mΩ, I

MAX

= 24A

Vishay

IHLP5050CEER1R0M01

Q1

N-MOSFET

I

DMAX

= 30A, R

DS(ON)

=

Infineon

BSC119N03S

Q2

N-MOSFET

I

DMAX

= 30A, R

DS(ON)

=

Infineon

BSC119N03S

Typical Applications Circuit

BOM

AP3591

Document number: DS36906 Rev. 1 - 2

3 of 18

www.diodes.com

March 2014

AP3591

NE W P R OD U CT

A Product Line of

Diodes Incorporated

Pin Number

Pin Name

Function

1

EN/DEM

Enable/Diode Emulation Mode control input. Connect to VDD for DEM mode; connect to GND for shutdown and float the pin for CCM mode

2

TON

On time/Frequency adjustment pin. Connect to PHASE through a resistor. TON is an input for the PWM controller

3

VOUT

Output voltage pin. Connect to the output of PWM converter. VOUT is an input for the PWM controller

4

VDD

Analog supply voltage input for the internal analog integrated circuit. Bypass to GND with a 1µF ceramic capacitor

5

FB

Feedback input pin. Connect FB pin to a resistor voltage divider from VOUT to GND to adjust V

OUT

from 0.75V to 3.3V

6

PGOOD

Power good signal open-drain output for PWM converter. This pin will be pulled high when the output voltage is within the target range

7

GND

Analog Ground 8 PGND

Power Ground

9

LGATE

Low-side N-MOSFET gate driver output for the PWM converter. This pin swings between PGND and VDDP

10

VDDP

VDDP is the gate driver supply for external MOSFETs. Bypass to GND with a 1µF ceramic capacitor

11

CS

Over current trip point set input. Connect a resistor from this pin to signal ground to set threshold for both over current limit and negative over current limit

12

PHASE

The UGATE High-side gate driver return. Also serves as anode of over current comparator

13

UGATE

High-side N-MOSFET floating gate driver output for the PWM converter. This pin swings between PHASE and BOOT

14

BOOT

Bootstrap pin. A bootstrap capacitor is connected for PWM converter. Connect to an external ceramic capacitor to PHASE

–

Exposed Pad

The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation

Pin Descriptions

AP3591

Document number: DS36906 Rev. 1 - 2

4 of 18

www.diodes.com

March 2014

AP3591

NE W P R OD U CT

A Product Line of

Diodes Incorporated

Min. t

OFF

1-SHOT

Q

S1

Latch

On-time

Compute

1-SHOT

TRIG

GM

V

REF

SS

(internal)

125% V

REF

70% V

REF

Q

S1

Latch

OV

UV

TRIG

Q

90% V

REF

SS Timer

Thermal

Shutdown

Diode

Emulation

Q

R

S

DRV

GM

5

2

3

4

1

7

6

8

9

10

12

13

14

11

10mA

VOUT

TON

FB

EN/DEM

GND

CS

PGOOD

PGND

LGATE

VDDP

PHASE

UGATE

BOOT

VDD

Functional Block Diagram

AP3591

Document number: DS36906 Rev. 1 - 2

5 of 18

www.diodes.com

March 2014

AP3591

NE W P R OD U CT

A Product Line of

Diodes Incorporated

Symbol

Parameter

Rating

Unit

VDD, V

DDP

Supply Voltage

-0.3 to 6

V

VBS

BOOT Pin Voltage

-0.3 to V

PHASE

+6

V

UGATE

Voltage from UGATE to PHASE

-0.3 to 6

V

LGATE

Voltage from LGATE to GND

-0.3 to 6

V

PHASE

Voltage from PHASE to GND

-0.3 to 36

V

PGND

Voltage from PGND to GND

-0.3 to 0.3

V

–

Voltage from Other Pins to GND

-0.3 to 6

V



JA

Thermal Resistance (Junction to Ambient)

60

C/W

TJ

Operating Junction Temperature

+150

C

T

STG

Storage Temperature

-65 to +150

C

T

LEAD

Lead Temperature (Soldering, 10Secs)

+260

C

V

HBM

ESD (Human Body Model)

2000

V

VMM

ESD (Machine Model)

200

V

Symbol

Parameter

Min

Max

Unit

VDD, V

DDP

Supply Voltage

4.5

5.5

V

VIN

Input Voltage

4.5

26

V

OUT(MAX)

Maximum Output Voltage

–

5.5

V

TA

Operating Ambient Temperature

-40

+85

ºC

Absolute Maximum Ratings (Note 4)

Note 4: Stresses greater than 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 Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

AP3591

Document number: DS36906 Rev. 1 - 2

6 of 18

www.diodes.com

March 2014

AP3591

NE W P R OD U CT

A Product Line of

Diodes Incorporated

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

SUPPLY INPUT

VIN

Input Voltage

–

4.5 – 26

V

I

Q-CCM

Quiescent Current

VDD+VDDP current, CCM, EN floating, V

FB

=

0.8V

–

500

800

µA

I

Q-DEM

VDD+V

DDP

current, DEM,

V

EN

= 5V, V

FB

= 0.8V

–

500

800

µA

I

SHDN

Shutdown Current

VDD+V

DDP

current, DEM,

V

EN

= 0V

– 1 10

µA

ON-TIME TIMER, OSCILLATOR FREQUENCY AND SOFT START

tON

On Time V

PHASE

= 12V, V

OUT

=

2.5V, R

ON

= 200kΩ

510

630

750

ns

V

PHASE

= 12V, V

OUT

=

1.05V, R

ON

= 200kΩ

190

260

330

t

OFF-MIN

Min Off Time

–

250

400

580

ns

t

SS

Internal Soft Start Time

–

0.82

1.2

1.5

ms

PWM CONTROLLER GATE DRIVERS

R

U_PH

Upper Gate Pull-up Resistance

V

BOOT-VPHASE

= 5V,

50mA source current

–

3.3 7 Ω

R

U_GATE

Upper Gate Sink Resistance

V

BOOT-VPHASE

= 5V,

50mA sink current

– 1 3

Ω

R

L_PH

Lower Gate Pull-up Resistance

– – 1.8 4 Ω

R

L_GATE

Lower Gate Sink Resistance

V

BOOT-VPHASE

= 5V,

50mA source current

–

0.5 2 Ω

–

PHASE Falling to LGATE Rising Delay

V

PHASE

< 1.2V to

V

LGATE

> 1.2V

–

30 – ns

–

LGATE Falling to UGATE Rising Delay

V

LGATE

< 1.2V to

(V

UGATE-VPHASE

) > 1.2V

–

30 – ns

V

BOOT

Boot Diode Forward Voltage

V

DDP-VBOOT

, I

BOOT

=

10mA

0.5

0.83 1 V

I

BSLK

VBS Leakage Current

V

BOOT

= 34V, V

PHASE

=

28V

–

0.1 1 µA

POWER GOOD

–

PGOOD Threshold

PGOOD from low to high

92.5

95

97.5

%

–

PGOOD from high to low

102

105

107

%

–

PGOOD Lower Threshold Hysteresis

– – ±5 – %

V

PG_L

PGOOD Low Voltage

– – –

0.4

V

I

PG_LEAK

PGOOD Output Leakage Current

V

PGOOD

= 5V

– – 1

µA

t

DELAY

PGOOD Delay Time

Delay for PGOOD pin

16

22

36

µs

Electrical Characteristics (V

= 12V, V

IN

DD

= V

DDP

= 5V, V

= 1.05V, TA = +25oC, unless otherwise specified.)

OUT