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PDF AP3591 Data sheet ( Hoja de datos )
| Número de pieza | AP3591 | |
| Descripción | SINGLE PHASE SYNCHRONOUS BUCK CONTROLLER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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Description
A Product Line of
Diodes Incorporated
AP3591
SINGLE PHASE SYNCHRONOUS BUCK CONTROLLER
Pin Assignments
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.
(Top View)
Pin 1 Mark
TON 2
VOUT 3
VDD 4
FB 5
PGOOD 6
1 14
13 UGATE
12 PHASE
EP 11 CS
10 VDDP
9 LGATE
78
U-QFN3535-14
Features
Applications
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 RDS_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)
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.
AP3591
Document number: DS36906 Rev. 1 - 2
1 of 18
www.diodes.com
March 2014
© Diodes Incorporated
1 page  
Absolute Maximum Ratings (Note 4)
A Product Line of
Diodes Incorporated
AP3591
Symbol
VDD, VDDP
VBS
VUGATE
VLGATE
VPHASE
VPGND
–
JA
TJ
TSTG
TLEAD
VHBM
VMM
Parameter
Supply Voltage
BOOT Pin Voltage
Voltage from UGATE to PHASE
Voltage from LGATE to GND
Voltage from PHASE to GND
Voltage from PGND to GND
Voltage from Other Pins to GND
Thermal Resistance (Junction to Ambient)
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10Secs)
ESD (Human Body Model)
ESD (Machine Model)
Rating
-0.3 to 6
-0.3 to VPHASE+6
-0.3 to 6
-0.3 to 6
-0.3 to 36
-0.3 to 0.3
-0.3 to 6
60
+150
-65 to +150
+260
2000
200
Unit
V
V
V
V
V
V
V
C/W
C
C
C
V
V
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
Symbol
VDD, VDDP
VIN
VOUT(MAX)
TA
Parameter
Supply Voltage
Input Voltage
Maximum Output Voltage
Operating Ambient Temperature
Min Max Unit
4.5 5.5 V
4.5 26 V
– 5.5 V
-40 +85 ºC
AP3591
Document number: DS36906 Rev. 1 - 2
5 of 18
www.diodes.com
March 2014
© Diodes Incorporated
5 Page 
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 0.75V, the error comparator will trigger the control logic and generate an ON-time
period, in which high side MOSFET is turned on and low side MOSFET is turned off. The ON-time period length is calculated using the following
equation:
t ON
VOUT
VIN f
VOUT is the output voltage, VIN is the input voltage, and f is the switching frequency.
The on-time is the time required for the voltage on this capacitor charging from zero volts to VOUT, thereby the ON-time of the high side switch is
directly proportional to the output voltage and inversely proportional to the input voltage. The implementation results in a nearly constant switching
frequency without the need of a clock generator.
tON = 14.5p×RTON×(VOUT+0.1)/VIN+50ns
After an ON-time period, the AP3591 goes into the OFF-time period. The OFF-time period length depends on VFB in most case. It will end when
VFB decreases below 0.75V and then the ON-time period is triggered again. If the OFF-time period is less than the minimum OFF time, the
minimum OFF time will be applied, which is about 400ns typical.
2. Mode Selection Operation
AP3591 has two operation modes: Continuous Conduction Mode (CCM) and Diode Emulation Mode (DEM). When the EN/DEM pin voltage is
higher than 2.9V, AP3591 will operate in DEM mode for high efficiency; when the EN/DEM pin is floating, AP3591 will operate in forced CCM
mode to a certain frequency during a light load condition.
2.1 Diode Emulation Mode
If the DEM mode is selected, the AP3591 automatically reduces the switching frequency under a light load condition to get high efficiency. When
the output current decreases and heavy load condition is formed, the inductor current decreases as well, and eventually comes close to zero
current, which is the boundary between CCM and DEM. The low side MOSFET will turn off whenever the inductor current reaches zero level. The
load is provided only by the output capacitor. When FB voltage is lower than 0.75V, the next ON cycle is beginning. The ON-time is kept the same
as that in the heavy load condition. The switching frequency increases to keep VOUT voltage when the output current increases from light to heavy
load. The transition load point is calculated using the following equation:
ILOAD
VIN VOUT
2L
tON
tON is the on-time.
2.2 Continuous Conduction Mode
When AP3591 operates in CCM mode, the duty cycle VOUT/VIN is not changed at light load condition. The low side MOSFET keeps on even when
inductor current decreases to reverse. The benefit of CCM is to keep the switching frequency fairly constant to avoid a certain frequency during a
light load condition.
3. Power On Reset and Soft-start
Power on reset occurs when VDD rises above approximately 3.9V: the IC will reset the fault latch and prepare the PWM for operation. When VDD is
below 3.6V, the VDD under voltage lockout (UVLO) circuitry inhibits switching by keeping UGATE and LGATE low. A built-in soft-start is used to
prevent surge current from power supply input VIN during turn on (referring to 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 95% of 0.75V in 1.2ms for AP3591 after the soft-start cycle is initiated.
Figure 1 shows a typical start-up interval for AP3591 when the EN/DEM pin has been released from a grounded (system shutdown) state.
AP3591
Document number: DS36906 Rev. 1 - 2
11 of 18
www.diodes.com
March 2014
© Diodes Incorporated
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AP3591.PDF ] | |
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