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PDF AP3436 Data sheet ( Hoja de datos )
| Número de pieza | AP3436 | |
| Descripción | 1.25MHz High Performance Synchronous Buck Converter | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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Description
A Product Line of
Diodes Incorporated
AP3436/A
3A, 1.25MHz High Performance Synchronous Buck Converter
Pin Assignments
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
(Top View)
Pin 1 Mark
FB 1
10 EN
VCC 2
11
9 PGOOD
VIN 3 EP 8 BOOT
GND 4
7 SW
GND 5
6 SW
Features
U-DFN3030-10
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)
Desktop & Notebook
Low Voltage, High Density Power System
Consumer Application Such as Set Top Box, LCD Display and
CPE Equipment
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.
AP3436/A
Document number: DS37212 Rev. 2 - 2
1 of 15
www.diodes.com
April 2014
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
AP3436/A
Electrical Characteristics (VCC = 5V, VIN = 5V, TA = +25°C, unless otherwise specified.)
Symbol
Parameter
SUPPLY VOLTAGE (VCC, VIN PIN)
VCC Analog Power Input Voltage
VIN Power Input Voltage
IQ Quiescent Current
ISHDN
Shutdown Supply Current
POWER ON RESET
VUVLO
VHYS_VCC
Internal Under Voltage Lockout
Threshold for VCC
Internal Under Voltage Hysteresis
for VCC
VOLTAGE REFERENCE (FB PIN)
VFB Voltage Reference
INTERNAL PWM FREQUENCY
f PWM Frequency
MOSFET SPEC
RON_H
High Side Switch On-resistance
RON_L
Low Side Switch On-resistance
CURRENT LIMIT
ILIMIT
Current Limit Threshold
THERMAL SHUTDOWN
TTSD
–
Thermal Shutdown
Hysteresis
BOOT SPEC (BOOT PIN)
RBOOT
–
BOOT Charge Resistor
BOOT to SW UVLO
SOFT START
tSS Soft Start Time
Conditions
–
–
VFB = 1.5V, VCC = 5V,
VIN = 5V
VEN = 0V,
3.0V ≤ VCC ≤ 5.5V,
1.3V ≤ VIN ≤ 5.5V
–
–
3.0V ≤ VCC ≤ 5.5V
3.0V ≤ VCC ≤ 5.5V
VBOOT_SW = 5.0V
VBOOT_SW = 3.0V
VCC = 5.0V
VCC = 3.0V
–
–
–
VCC = 5.0V
VCC = 3.0V
–
Min Typ Max Unit
3.0 – 5.5
1.3 – 5.5
– 400 –
––1
V
V
µA
µA
– 2.75 2.85 V
– 150 – mV
0.591
0.600
0.609
V
1.0 1.25 1.5 MHz
– 50 100 mΩ
– 70 140 mΩ
– 50 100 mΩ
– 70 140 mΩ
4.8 7.6
– +160
– +20
–
–
–
A
°C
°C
– 16 –
– 2.2 –
Ω
V
0.8 –
2 ms
AP3436/A
Document number: DS37212 Rev. 2 - 2
5 of 15
www.diodes.com
April 2014
© Diodes Incorporated
5 Page 
A Product Line of
Diodes Incorporated
AP3436/A
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
Document number: DS37212 Rev. 2 - 2
11 of 15
www.diodes.com
April 2014
© Diodes Incorporated
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AP3436.PDF ] | |
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