AP2952A Datasheet PDF - Chipown

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AP2952A
Chipown

Part Number AP2952A
Description 18V Synchronous Rectified Step-Down Converter
Page 9 Pages


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AP2952A
Description
The AP2952A is a monolithic synchronous buck regulator.
The device integrates 130mΩ MOSFETS that provide 2A
continuous load current over a wide operating input voltage
of 4.75V to 18V. Current mode control provides fast transient
response and cycle-by-cycle current limit.
An adjustable soft-start prevents inrush current at turn-on. In
shutdown mode, the supply current drops below 1μA.
This device, available in an 8-pin SOP package, provides a
very compact system solution with minimal reliance on
external components.
Applications
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
Chipown
2A, 18V Synchronous Rectified
Step-Down Converter
Features
2A Output Current
Wide 4.75V to 18V Operating Input Range
Integrated 130mΩ Power MOSFET Switches
Output Adjustable from 0.925V to 15V
Up to 95% Efficiency
Programmable Soft-Start
Fixed 450KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Thermally Enhanced 8-Pin SOP Package
Package
Typical Application Circuit
Figure 1. Typical Application Circuit
100
90
80
70
60
50
40
30
20
10
0
0
Vout=5V
Vin=9V
Vin=12V
Vin=18V
400 800 1200 1600 2000
Load(mA)
Figure 2. Typical Efficiency Curve
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn
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AP2952A
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Absolute Maximum Ratings(1)
Supply Voltage (VIN)..................................-0.3V to 20V
Switch Voltage (VSW)......................–1V to VIN + 0.3V
Bootstrap Voltage (VBS) ..........Vsw-0.3V to VSW + 6V
Enable/UVLO Voltage (VEN)....................–0.3V to +6V
Comp Voltage (VCOMP) ..........................–0.3V to +6V
Feedback Voltage (VFB) ...........................–0.3V to +6V
Junction Temperature .................................... +150℃
Lead Temperature (Soldering, 10s)................... +260
Storage Temperature......................... –65°C to +150
Recommended Operating Conditions(2)
Input Voltage (VIN) ........................................ 4.75V to 18V
Output Voltage (VSW) .................................... 0.925 to 15V
Operating Temperature...................................–40to +85
Thermal Resistance(3) θJA θJC
SOP8-PP ..............................50...... 10... /W
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1”square of 1 oz copper.
Electrical Characteristics
VIN = 12V, TA = +25, unless otherwise noted.
Parameter
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Overvoltage Threshold
Error Amplifier Voltage
Error Amplifier Transconductance
High-Side Switch-On Resistance
Low-Side Switch-On Resistance
High-Side Switch Leakage
Upper Switch Current Limit
Lower Switch Current Limit
COMP to Current Sense Transconductance
Oscillator Frequency
Short Circuit Frequency
Maximum Duty Cycle
Minimum On Time
EN Shutdown Threshold Voltage
EN Shutdown Threshold Voltage Hysterisis
EN Lockout Threshold Voltage
EN Lockout Hysterisis
Input UVLO Threshold Rising
Condition
VEN 0.3V
VEN =2.0V, VFB = 1.0V
4.75VVIN 18V
ΔIC = ±10μA
VEN = 0V, VSW = 0V
VFB = 0V
VFB = 1.0V
VEN Rising
VIN Rising
Min Typ Max Units
1 3 µA
1.3 1.5 mA
900 925 946 mV
1.1 V
400 V/V
800 µA/V
130 mΩ
130 mΩ
10 µA
2.4 3.4
A
1.1 A
3.5 А/V
450 KHz
150 KHz
90 %
220 nS
1.1 1.5 2.0
V
40 mV
2.2 2.5 2.7
V
210 mV
3.8 4.1 4.4 V
Input UVLO Threshold Hysteresis
Soft-start Current
Soft-start Period
Thermal Shutdown
VSS = 0V
CSS = 0.1μF
210 mV
6 µA
15 ms
160 °C
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn
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AP2952A
Ordering Information
Part number
AP2952AS8T
1Y=year
W=week
AP2952AS8R
Pin Configuration
Mark1
2952
YYWW1
2952
YYWW1
Chipown
Package
SOP8&IC tube
SOP8&Embossed tape
Temperature
–40to +85
–40to +85
8
27
36
45
Pin Description
Pin #
Name
1 BS
2 IN
3 SW
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel
MOSFET switch. Connect a 0.01μF or greater capacitor from SW to BS to power the high
side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 18V power source. Bypass IN to GND with a suitably large
capacitor to eliminate noise on the input to the IC. See Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load. Note that a capacitor is required
from SW to BS to power the high-side switch.
4 GND Ground(Connect Exposed Pad to Pin 4)..
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
5
FB
resistive voltage divider from the output voltage. The feedback threshold is 0.925V. See
Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop. Connect
6
COMP
a series RC network from COMP to GND to compensate the regulation control loop. In
some cases, an additional capacitor from COMP to GND is required. See Compensation
Components.
7
EN
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn
on the regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to
8 SS GND to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 15ms. To
disable the soft-start feature, leave SS unconnected.
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn
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AP2952A
Chipown
Functional Description
The AP2952A is a synchronous rectified, current-mode,
step-down regulator. It regulates input voltages from 4.75V to
18V down to an output voltage as low as 0.925V, and supplies
up to 2A of load current.
The AP2952A uses current-mode control to regulate the output
voltage. The output voltage is measured at FB through a
resistive voltage divider and amplified through the internal
transconductance error amplifier. The voltage at the COMP pin
is compared to the switch current measured internally to
control the output voltage.
The converter uses internal N-Channel MOSFET switches to
step-down the input voltage to the regulated output voltage.
Since the high side MOSFET requires a gate voltage greater
than the input voltage, a boost capacitor connected between
SW and BS is needed to drive the high side gate. The boost
capacitor is charged from the internal 5V rail when SW is low.
When the AP2952A FB pin exceeds 20% of the nominal
regulation voltage of 0.925V, the over voltage comparator is
tripped and the COMP pin and the SS pin are discharged to
GND, forcing the high-side switch off.
Functional Block Diagram
Figure 3 Functional Block Diagram
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New Destrict Tel: +86(510)8521-7718 http://www.chipown.com.cn
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