AP3436/A
Document number: DS37212 Rev. 4 - 4
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AP3436/A
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3A, 1.25MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER
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.
Description
The AP3436/A is a step-down DC-DC converter with integrated
power stage capable of driving up to 3A continuous output current. It
integrates 2 N-channel power MOSFETs with low on-resistance.
Current mode control provides fast transient response and cycle-by-
cycle current limit.
For AP3436, the regulator adopts current-mode in forced pulse-width
modulation (PWM) mode with 1.25MHz switching frequency
internally, which allows small-sized components, such as capacitors
and inductors. This feature greatly simplifies the design of switch-
mode power supplies. Under PWM mode, the device remains at the
fixed PWM operation (typical at 1.25MHz), regardless of if the load
current is high or low.
For AP3436A, the regulator operates in either fixed PWM mode or a
pulse-skipping modulation (PSM) mode depending on the different
load conditions. The device can operate at typical 1.25MHz fixed
switching frequency under heavy load condition. At light load, the
regulator enters a PSM mode to minimize the switching loss by
reducing the switching frequency.
The AP3436/A provides EN function. Pulling this pin high statically
enables the device while pulling the pin low statically for longer than
10μs will shut it down.
Under Voltage Lockout is internally set at 2.75V for VCC detection.
The output voltage startup ramp is controlled by the soft start. An
open drain power good signal indicates the output is within 75% to
125% of its nominal voltage.
The AP3436/A is available in U-DFN3030-10 package.
Applications
Desktop & Notebook
Low Voltage, High Density Power System
Consumer Application Such as Set Top Box, LCD Display and
CPE Equipment
Pin Assignments
(Top View)
U-DFN3030-10
Features
Analog Power Input VCC Range: 3.0V to 5.5V
Power Input VIN Range: 1.3V to 5.5V
0.6V Reference Voltage with ±1.5% Precision
2 MOSFETs (Typ 50mΩ) for High Efficiency at 3A Loads
High Efficiency: Up to 95%
Output Current: 3A
Current Mode Control
Built-in Soft Start Function
UV and OV Power Good Output
Built-in UV and OV Protection Function
Built-in Over Current Protection
Built-in Thermal Shutdown Function
Thermally Enhanced 3mm×3mm DFN Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
FB
GND
VCC
VIN
GND
SW
SW
BOOT
PGOOD
EN
Pin 1 Mark
1
2
3
4
5 6
7
8
9
10
11
EP
PART OBSOLETE
CONTACT US
AP3436/A
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Typical Applications Circuit
PGOOD
EP
EN
VCC
FB GND
GND
SW
SW
BOOT
VIN
RPG
VCC
CVCC
VOUT
CBOOT L1
COUT
RFB2
RFB1
VIN
CIN
9
10
2
1
6
7
4
5
11
8
3
AP3436/A
Note 4: When using a single power supply for VCC and VIN, a 4.7Ω resistor should be placed between them for noise isolation.
Table 1. Component Guide
Component
Value
Unit
Component
Value
Unit
CVCC
1
µF
CIN
44
µF
RPG
10
kΩ
CBOOT
0.1
µF
RFB2
TBD
kΩ
L1
1.5
µH
RFB1
TBD
kΩ
COUT
88
µF
AP3436/A
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Pin Descriptions
Functional Block Diagram
75%
Logic
125%
EA
Voltage
Reference
Soft Start
EN Shutdown
Logic
Thermal
Shutdown UVLO
Boot
Charge
Boot
UVLO
Logic and
PWM Latch
PWM
Slope
Compensation
Oscillator
Current Limit and
Short Protection
Current
Sense
FB 1
2
VCC
910
PGOOD EN
GND
GND
SW
BOOT
3
VIN
8
6,7
4,5
4,5
+
Pin Number
Pin Name
Function
1
FB
Voltage Feedback Input. Connect to VOUT through a voltage divider to set
the output voltage
2
VCC
Analog Power Input
3
VIN
Power Input
4, 5
GND
Ground. Must be Connected to GND on PCB
6, 7
SW
Power Switch Output
8
BOOT
High Side Switch Driver Supply
9
PGOOD
Open Drain Power Good Output
10
EN
Enable
11
Exposed Pad
Thermal Connection to the PCB. Must be connected to GND on PCB
AP3436/A
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Absolute Maximum Ratings (Note 5)
Note 5: 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
Symbol
Parameter
Rating
Unit
VCC, VIN
VCC, VIN Pin Voltage
-0.3 to 6
V
VEN
EN Pin Voltage
-0.3 to 6
V
VSW
SW Pin Voltage
-0.3 to VIN+0.3
V
VSW_TRANSIENT
SW Pin Transient Voltage (<50ns)
-5 to VIN+5
V
VFB
FB Pin Voltage
-0.3 to 6
V
VPGD
PGOOD Pin Voltage
-0.3 to 6
V
VBOOT_SW
BOOT to SW Voltage
0 to 6
V
θJA
Thermal Resistance (Junction to Ambient, Simulation)
33
°C /W
θJC
Thermal Resistance (Junction to Case)
3
°C /W
TJ
Operating Junction Temperature
-40 to +150
°C
TSTG
Storage Temperature
-65 to +150
°C
TLEAD
Lead Temperature (Soldering, 10sec)
+260
°C
VHBM
ESD (Human Body Model)
2000
V
VMM
ESD (Machine Model)
200
V
Symbol
Parameter
Min
Max
Unit
VCC
Analog Input Voltage
3.0
5.5
V
VIN
Power Input Voltage
1.3
5.5
V
IOUT(MAX)
Maximum Output Current
3
–
A
VOUT
Output Voltage
0.8
VIN
V
TA
Operating Ambient Temperature
-40
+85
°C
AP3436/A
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Electrical Characteristics (VCC = 5V, VIN = 5V, TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
SUPPLY VOLTAGE (VCC, VIN PIN)
VCC
Analog Power Input Voltage
–
3.0
–
5.5
V
VIN
Power Input Voltage
–
1.3
–
5.5
V
IQ
Quiescent Current
VFB = 1.5V, VCC = 5V,
VIN = 5V
–
400
–
µA
ISHDN
Shutdown Supply Current
VEN = 0V,
3.0V ≤ VCC ≤ 5.5V,
1.3V ≤ VIN ≤ 5.5V
–
–
1
µA
POWER ON RESET
VUVLO
Internal Under Voltage Lockout
Threshold for VCC
–
–
2.75
2.85
V
VHYS_VCC
Internal Under Voltage Hysteresis
for VCC
–
–
150
–
mV
VOLTAGE REFERENCE (FB PIN)
VFB
Voltage Reference
3.0V ≤ VCC ≤ 5.5V
0.591
0.600
0.609
V
INTERNAL PWM FREQUENCY
f
PWM Frequency
3.0V ≤ VCC ≤ 5.5V
1.0
1.25
1.5
MHz
MOSFET SPEC
RON_H
High Side Switch On-resistance
VBOOT_SW = 5.0V
–
50
100
mΩ
VBOOT_SW = 3.0V
–
70
140
mΩ
RON_L
Low Side Switch On-resistance
VCC = 5.0V
–
50
100
mΩ
VCC = 3.0V
–
70
140
mΩ
CURRENT LIMIT
ILIMIT
Current Limit Threshold
–
4.8
7.6
–
A
THERMAL SHUTDOWN
TTSD
Thermal Shutdown
–
–
+160
–
°C
–
Hysteresis
–
–
+20
–
°C
BOOT SPEC (BOOT PIN)
RBOOT
BOOT Charge Resistor
VCC = 5.0V
–
16
–
Ω
–
BOOT to SW UVLO
VCC = 3.0V
–
2.2
–
V
SOFT START
tSS
Soft Start Time
–
0.8
–
2
ms
AP3436/A
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Electrical Characteristics (Cont. VCC = 5V, VIN = 5V, TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
ENABLE (EN PIN)
VEN_L
EN Pin Threshold
–
–
–
0.8
V
VEN_H
–
1.6
–
–
V
POWER GOOD (PGOOD PIN)
VFBTH
Feedback Threshold
VFB falling (Fault)
70
75
–
%VREF
VFB rising (Good)
77
82
–
VFB rising (Fault)
–
125
130
VFB falling (Good)
–
118
123
tPG_DLY
Delay Time for PGOOD from High
to Low
–
–
30
–
µs
RPG
Internal Power Good Pull Low
Resistance
–
–
–
150
Ω
RPG_UP
External Pull-up Resistance Range
–
3000
–
–
Ω
SYSTEM PERFORMANCE
VUVP
Output Under Voltage Protection
Threshold
VIN = 1.3 to 5.5V
–
–
0.5×
VOUT
V
tUVP
Delay Time for UVP Triggered
VIN = 1.5 to 5V
–
65
–
µs
VOVP
Output Over Voltage Protection
Threshold
VIN = 1.3 to 5.5V
1.5×
VOUT
–
–
V
tOVP
Delay Time for OVP Triggered
VIN = 1.5 to 5V
–
65
–
µs
IOUT
Output Current
VIN = 1.5 to 5V,
VOUT = 1.0V
3
–
–
A
–
Output Voltage Line Regulation
VIN = 1.5 to 5V,
IOUT = 100mA
–
0.4
–
%×
VOUT/V
–
Output Voltage Load Regulation
IOUT = 0A to 3A
–
0.3
–
%×
VOUT/A
VTRAN
Output Voltage Load Transient
VIN = 5V, VOUT = 1.0V,
dI/dt = 400mA/µs
–
±2.5
–
%×
VOUT/A
η
Efficiency
VCC = 5V, VIN=5V,
IOUT = 3A, VOUT = 1.2V
–
80
–
%
AP3436/A
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Performance Characteristics
Efficiency vs. Output Current Reference Voltage vs. Input Voltage
Reference Voltage vs. Temperature PWM Frequency vs. Input Voltage
PWM Frequency vs. Temperature Current Limit vs. Input Voltage
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00
0
10
20
30
40
50
60
70
80
90
100
Output Current (A)
Efficiency (%)
VIN=VCC=5.0V
VOUT=1.0V
AP3436
3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50
0.590
0.592
0.594
0.596
0.598
0.600
0.602
0.604
0.606
0.608
0.610
Input Voltage(V)
Reference Voltage(V)
VIN=VCC=VEN
-40 -20 0 20 40 60 80 100 120 140
0.56
0.57
0.58
0.59
0.60
0.61
0.62
0.63
0.64
Reference Voltage(V)
Temperature (oC)
VIN=VCC=5.0V
3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
PWM Frequency (MHz)
Input Voltage (V)
VCC=VIN=VEN
-40 -20 0 20 40 60 80 100 120 140
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
PWM Frequency (MHz)
Temperature (oC)
VIN=VCC=5.0V
3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
Current Limit (A)
Input Voltage (V)
VIN=VCC=VEN
AP3436/A
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Performance Characteristics (Cont.)
Current Limit vs. Temperature Line Regulation vs. Input Voltage
Load Regulation vs. Output Current Power on Waveform
(VIN=VCC=5V, VOUT=1V, IOUT=3A)
Power off Waveform Enable Waveform
(VIN=VCC=5V, VOUT=1V, IOUT=3A) (VIN=VCC=5V, VOUT=1V, IOUT=3A)
-40 -20 0 20 40 60 80 100 120 140
6.00
6.25
6.50
6.75
7.00
7.25
7.50
7.75
8.00
8.25
8.50
8.75
9.00
Current Limit (A)
Temperature (oC)
VIN=VCC=5.0V
3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
Line Regulation (%)
Input Voltage (V)
VOUT = 1.0V
VIN= VCC= VEN
VIN
2V/div
VOUT
500mV/div
IL
1A/div
Time 400µs/div
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
Load Regulation (%)
Output Current (A)
VIN=VCC=VEN=5.0V
VOUT=1.0V
Time 1ms/div
IL
1A/div
VOUT
500mV/div
VCC/IN
2V/div
VEN
1V/div
VIN
2V/div
IL
2A/div
VOUT
1V/div
AP3436/A
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Performance Characteristics (Cont.)
Disable Waveform Load Transient Response
(VIN=VCC=5V, VOUT=1V, IOUT=3A) (VIN=VCC=5V, VOUT=1V, IOUT=0 to 3A)
Load Transient Response
(VIN=VCC=3.3V, VOUT=1V, IOUT=0 to 3A)
Time 200µs/div
VCC/IN
2V/div
VEN
1V/div
VOUT
500mV/div
IL
1A/div
VOUT_AC
20mV/div
IOUT
1A/div
Time 200µs/div
Time 200µs/div
VOUT_AC
20mV/div
IOUT
1A/div
AP3436/A
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Application Information
1. Overview
The AP3436/A is a 3A synchronous buck (step-down) converter with two integrated N-channel MOSFETs. For AP3436, the regulator operates in
PWM mode with 1.25MHz switching frequency internally, regardless of if the load current is high or low. For AP3436A, when the load is very light,
the regulator automatically operates in the PSM mode to minimize the switching loss, thus achieving high efficiency at light load. When the load
increases, the regulator automatically switches over to a current-mode PWM operating at nominal 1.25MHz switching frequency.
2. Power On Reset
A Power On Reset (POR) circuitry continuously monitors the supply voltage at VCC pin. Once the rising POR threshold is exceeded, the
AP3436/A sets itself to active state and is ready to accept chip enable command. The rising POR threshold is typically 2.75V.
3. Soft Start
A built-in soft-start is used to prevent surge current from power supply input VIN during turn on (Referring to the Functional Block Diagram). The
error amplifier is a three-input device. Reference voltage VREF or the internal soft-start voltage VSS whichever is smaller dominates the behavior of
the non-inverting inputs of the error amplifier. VSS internally ramps up to 0.6V after the soft-start cycle is initiated. The ramp is created digitally, so
the output voltage will follow the VSS signal and ramps up smoothly to its target level.
4. EN Function
The AP3436/A provides Enable Function. Pulling this pin higher than 1.6V statically enables the AP3436/A while pulling the pin lower than 0.8V
statically for longer than 10µs will shutdown the IC.
5. Adjusting Output Voltage
The output voltage is set with a resistor divider from the FB pin. It is recommended to use divider resistors with 1% tolerance or better. Start with a
100kΩ for the resistor R1 and use the following equation to calculate R2. Consider using larger value resistors to improve efficiency at very light
loads. If the values are too high, the regulator is more susceptible to noise and the voltage errors caused by FB input current are noticeable.
Figure 1. Voltage Divider Circuit
6. Short Circuit Protection (SCP)
The AP3436/A has Over Current Protection (OCP) and Under Voltage Protection (UVP) functions.
6.1 OCP Function
The high side switch current is detected during each cycle. During SCP conditions, the output voltage is pulled down and the switch current is
increased. Once the increased high side switching current is detected to trigger the current limit of high side switch, the high side switch will be
immediately turned off and will not be turned on again until the next switching cycle. When over current condition is removed, the AP3436/A will
recover back to normal operation again.
6.2 UVP Function
The FB voltage is also monitored for Under Voltage Protection. The UV threshold is set at 0.2V. The under voltage protection has 65µs triggered
delay. When UVP is triggered, both high side and low side are shutdown immediately. The UVP is a latched function, reset power supply or EN pin
to restart AP3436/A again.
6.0
6.01
2
OUT
VR
R
FB
VOUT
R1
R2
AP3436/A
-
+
+
0.6V
VSS
AP3436/A
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Application Information (Cont.)
7. Over Voltage Protection (OVP)
The output voltage is continuously monitored for Over Voltage Protection by FB pin. When it is larger than 1.67 times as setting, the OVP function
is triggered. The Over Voltage Protection has 65µs triggered delay.
When OVP is triggered, both high side and low side are shutdown immediately and the output voltage is discharged by an internal 1kΩ resistor.
8. Power Good
The PGOOD pin output connects an open drain MOSFET. The output is pulled low when the FB voltage enters the fault condition by falling below
75% or rising above 125% of the nominal internal reference voltage. There is a 7% hysteresis on the threshold voltage, so when the FB voltage
rises to the good condition above 82% or falls below 118% of the internal voltage reference the PGOOD output MOSFET is turned off. It is
recommended to use a pull-up resistor between the values of 3kΩ and 100kΩ to a voltage source that is 5V or less.
9. Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds +160°C. Switching is stopped when the
junction temperature exceeds the thermal trip threshold. Once the die temperature decreases below +140°C, the device reinitiates the soft start
operation. The thermal shutdown hysteresis is +20°C.
AP3436/A
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Ordering Information
AP3436X XX XX – XX
Packing
Package
TR : Tape & Reel
A : AP3436A
Blank : AP3436
Product Name Product Version
DN : U-DFN3030-10 G1 : Green
RoHS/Green
Marking Information
AP3436 (Top View)
AP3436A (Top View)
Package
Temperature
Range
Function
Part Number
Marking ID
Packing
U-DFN3030-10
-40 to +85°C
PWM
AP3436DNTR-G1
BDB
5000/Tape & Reel
PWM/PSM
AP3436ADNTR-G1
BDF
5000/Tape & Reel
First Line: Logo and Marking ID
Second and Third Lines: Date Code
Y: Year
WW: Work Week of Molding
M: Assembly House Code
XX: 7th and 8th Digits of Batch No.
First Line: Logo and Marking ID
Second and Third Lines: Date Code
Y: Year
WW: Work Week of Molding
M: Assembly House Code
XX: 7th and 8th Digits of Batch No.
AP3436/A
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Package Outline Dimensions (All dimensions in mm(inch).)
(1) Package Type: U-DFN3030-10
2.900(0.114)
3.100(0.122)
2.900(0.114)
3.100(0.122)
1.500(0.059)
1.800(0.071)
0.200(0.008)
0.300(0.012)
0.500(0.020)
TYP
0.250(0.010)
0.550(0.022)
0.000(0.000)
0.050(0.002)
2.300(0.090)
2.500(0.098)
N1
N5
N6 N10
Pin 1 Mark
PIN #1 IDENTIFICATION
See DETAIL A
12
DETAIL A
12 12
Pin 1 options
Symbol A
min(mm) max(mm) min(inch) max(inch)
Option1
Option2
0.700
0.570
0.800
0.630
0.028
0.022
0.031
0.025
A3
min(mm) max(mm) min(inch) max(inch)
0.153
0.150 (Typ)
0.253 0.006
0.006 (Typ)
0.010
AA3
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Suggested Pad Layout
(1) Package Type: U-DFN3030-10
X1
Y1
X2
Y2 Y
E
Dimensions
Y
(mm)/(inch)
X1
(mm)/(inch)
Y1
(mm)/(inch)
X2
(mm)/(inch)
Y2
(mm)/(inch)
E
(mm)/(inch)
Value
3.300/0.130
0.300/0.012
0.600/0.024
2.600/0.102
1.800/0.071
0.500/0.020
AP3436/A
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OBSOL ETE – PA RT DI S CONT INU E D
IMPORTANT NOTICE
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).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
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