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AP3591

Document number: DS36906 Rev. 1 - 2

1 of 18

www.diodes.com

March 2014

AP3591

NEW PROD UCT

A Product Line of

Diodes Incorporated

SINGLE PHASE SYNCHRONOUS BUCK CONTROLLER

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

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.

VOUT

VDD

PGOOD

GND

PGND

LGATE

EN/DEM

TON

BOOT

UGATE

PHASE

VDDP

Pin 1 Mark

1 14

7 8

Summary of content (18 pages)

PAGE 1
A Product Line of Diodes Incorporated AP3591 SINGLE PHASE SYNCHRONOUS BUCK CONTROLLER Description Pin Assignments (Top View) TON 1 14 2 13 UGATE VOUT 3 4 FB 5 PGOOD EP 12 PHASE 11 CS 10 VDDP 6 9 LGATE 7 8 PGND 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.
PAGE 2
A Product Line of Diodes Incorporated AP3591 Typical Applications Circuit R3 14 2 10 UGATE R1 10 4 VDD C2 1 mF 6 CCM/ DEM 1 5 PGOOD AP3591 NEW PRODUCT VDDP R2 100K C1 10 mF BOOT TON VDDP V IN =12V 250K EN/DEM PHASE 13 C3 0.1mF L 12 LGATE VOUT =1.05V 1.
PAGE 3
A Product Line of Diodes Incorporated AP3591 Pin Descriptions 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.
PAGE 4
A Product Line of Diodes Incorporated AP3591 Functional Block Diagram TRIG NEW PRODUCT VOUT TON On-time Compute 1-SHOT 3 2 SS (internal) 14 GM S VREF Q DRV OV 70% VREF UV 5 Q 10 DRV Q 9 8 6 Diode Emulation 90% VREF VDD 4 SS Timer GM 7 1 AP3591 Document number: DS36906 Rev. 1 - 2 4 of 18 www.diodes.com VDDP LGATE PGND PGOOD 10mA 11 Thermal Shutdown EN/DEM PHASE TRIG Latch S1 UGATE 1-SHOT Latch S1 125% VREF 13 12 Min.
PAGE 5
A Product Line of Diodes Incorporated AP3591 Absolute Maximum Ratings (Note 4) Symbol Parameter VDD, VDDP NEW PRODUCT Unit -0.3 to 6 V -0.3 to VPHASE+6 V Supply Voltage VBS BOOT Pin Voltage VUGATE Voltage from UGATE to PHASE -0.3 to 6 V VLGATE Voltage from LGATE to GND -0.3 to 6 V VPHASE Voltage from PHASE to GND -0.3 to 36 V VPGND Voltage from PGND to GND -0.3 to 0.3 V -0.
PAGE 6
A Product Line of Diodes Incorporated AP3591 Electrical Characteristics (VIN = 12V, VDD = VDDP = 5V, VOUT = 1.05V, TA = +25oC, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit 4.5 – 26 V – 500 800 µA VDD+VDDP current, DEM, VEN = 5V, VFB = 0.8V – 500 800 µA VDD+VDDP current, DEM, VEN = 0V – 1 10 µA VPHASE = 12V, VOUT = 2.5V, RON = 200kΩ 510 630 750 VPHASE = 12V, VOUT = 1.
PAGE 7
A Product Line of Diodes Incorporated AP3591 Electrical Characteristics (Cont. VIN = 12V, VDD = VDDP = 5V, VOUT = 1.05V, TA = +25oC, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Unit 0.75 – 5.5 V – 20 – Ω 0.742 0.75 0.758 V VOUT AND REFERENCE VOLTAGE Output Voltage – Output Discharge Resistance VEN = 0V VFB Feedback Voltage VDD = 4.5V to 5.5V IFB Feedback Bias Current VFB = 0.
PAGE 8
A Product Line of Diodes Incorporated AP3591 Performance Characteristics 100 80 80 60 60 40 Efficiency (%) Efficiency (%) Efficiency vs. Load Current @VOUT = 2.5V 100 VIN = 8V VIN = 12V VIN = 20V 20 VIN = 8V VIN = 12V VIN = 20V 40 20 0 0 0 2000 4000 6000 8000 10000 0 12000 2000 4000 6000 8000 10000 12000 Load Current (mA) Load Current (mA) Efficiency vs. Load Current (CCM vs. DEM) Frequency vs.
PAGE 9
A Product Line of Diodes Incorporated AP3591 Performance Characteristics (Cont.) Shutdown Current vs. VIN ICS vs. Temperature (C) 15 2.0 14 12 ICS (mA) Shutdown Current (mA) NEW PRODUCT 13 1.5 1.0 0.5 11 10 9 8 0.0 6 8 10 12 14 16 18 20 22 24 7 -40 26 0 20 40 60 80 100 120 140 160 Temperature ( C) Power ON from EN @CCM VOUT 2V/div -20 o VIN (V) Power ON from EN @DEM VOUT 2V/div VPHASE 10V/div VPHASE 10V/div VEN 1V/div VEN 2V/div IL 5A/div IL 2.
PAGE 10
A Product Line of Diodes Incorporated AP3591 Performance Characteristics (Cont.
PAGE 11
A Product Line of Diodes Incorporated AP3591 Application Information 1. Functional Description The AP3591 is a synchronous step-down controller. Adaptive constant on time (COT) control is employed to provide fast transition response and easy loop stabilization. AP3591 does not have a dedicated in board oscillator. It runs with a pseudo-constant frequency which is set by RON. The output voltage variation is sensed by FB Pin. If VFB is below 0.
PAGE 12
A Product Line of Diodes Incorporated AP3591 Application Information (Cont.) Power On from EN (DEM Mode) NEW PRODUCT VOUT 1V/div VUGATE 20V/div VEN 2V/div VPGOOD 5V/div Time 400µs/div Figure 1. Start-up Behavior of AP3591 4. Power Good Output The AP3591 features power good output to monitor the output voltage. It is an open-drain output and should be connected to a 5V power supply node through a resistor. The power good function is active after the soft start is finished.
PAGE 13
A Product Line of Diodes Incorporated AP3591 Application Information (Cont.) 7. Over Current Protection (OCP) NEW PRODUCT Figure 3 shows the over current protection (OCP) scheme of AP3591. In each switching cycle, the inductor current is sensed by monitoring the low-side MOSFET in the OFF period. When the voltage between PGND pin and PHASE pin is larger than the over current trip level, the OCP is triggered and the controller keeps the OFF state.
PAGE 14
A Product Line of Diodes Incorporated AP3591 Application Information (Cont.) The AP3591 provides full-time over voltage protection whenever soft-start completes or not. The typical OVP threshold is 125% of the internal reference voltage VREF. The AP3591 provides latched OVP and can only be released by VDD or EN/DEM power-on reset. There is 33µs delay NEW PRODUCT built into the over voltage protection circuit to prevent false transitions.
PAGE 15
A Product Line of Diodes Incorporated AP3591 Ordering Information AP3591 XX XX – XX Package Packing RoHS/Green FN : U-QFN3535-14 TR : Tape & Reel G1 : Green NEW PRODUCT Product Name Diodes IC’s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green.
PAGE 16
A Product Line of Diodes Incorporated AP3591 Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: U-QFN3535-14 NEW PRODUCT Pin 1 Mark 1.900(0.075) 2.100(0.083) 0.200(0.008) 0.300(0.012) N14 N1 PIN #1 IDENTIFICATION See DETAIL A N13 N2 3.400(0.134) 3.600(0.142) 0.500(0.020) BSC 1.900(0.075) 2.100(0.083) N6 N8 3.400(0.134) 3.600(0.142) 0.350(0.014) 0.450(0.018) 1.500(0.059) BSC A1 DETAIL A 1 1 1 2 2 2 3 3 3 4 4 4 0.000(0.000) 0.050(0.002) Pin 1 options 0.
PAGE 17
A Product Line of Diodes Incorporated AP3591 Suggested Pad Layout (1) Package Type: U-QFN3535-14 E2 NEW PRODUCT Y2 X1 E1 Y1 Y Y3 X2 X3 X Dimensions X=Y (mm)/(inch) X1=Y1 (mm)/(inch) X2=Y2 (mm)/(inch) X3=Y3 (mm)/(inch) E1 (mm)/(inch) E2 (mm)/(inch) Value 3.800/0.150 2.100/0.083 0.650/0.026 0.300/0.012 0.500/0.020 1.500/0.059 AP3591 Document number: DS36906 Rev. 1 - 2 17 of 18 www.diodes.
PAGE 18
A Product Line of Diodes Incorporated AP3591 IMPORTANT NOTICE NEW PRODUCT DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).