Innovative PowerTM - 1 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
FEATURES
• Up to 40V Input Voltage
• Up to 2A output current
• Output Voltage up to 12V
• Patent Pending Active CC Sensorless Constant
Current Control
− Integrated Current Control Improves
Efficiency, Lowers Cost, and Reduces
Component Count
• Resistor Programmable
− Current Limit from 750mA to 2A
− Patented Cable Compensation from 0 to
0.5
• ±7.5% CC Accuracy
− Compensation of Input /Output Voltage Change
− Temperature Compensation
− Independent of inductance and Inductor DCR
• 2% Feedback Voltage Accuracy
• Up to 93% Efficiency
• 210kHz Switching Frequency Eases EMI Design
• Advanced Feature Set
− Integrated Soft Start
− Thermal Shutdown
− Secondary Cycle-by-Cycle Current Limit
− Protection Against Shorted ISET Pin
• SOP-8EP Package
APPLICATIONS
• Car Charger/ Adaptor
• Rechargeable Portable Devices
• General-Purpose CC/CV Supply
GENERAL DESCRIPTION
ACT4513 is a wide input voltage, high efficiency
Active CC step-down DC/DC converter that
operates in either CV (Constant Output Voltage)
mode or CC (Constant Output Current) mode.
ACT4513 provides up to 2A output current at
210kHz switching frequency.
Active CC is a patent-pending control scheme to
achieve highest accuracy sensorless constant
current control. Active CC eliminates the expensive,
high accuracy current sense resistor, making it ideal
for battery charging applications and adaptors with
accurate current limit. The ACT4513 achieves
higher efficiency than traditional constant current
switching regulators by eliminating its associated
power loss.
Protection features include cycle-by-cycle current
limit, thermal shutdown, and frequency foldback at
short circuit. The devices are available in a SOP-
8EP package and require very few external devices
for operation.
ACT4513
Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
Rev 7, 14-Nov-12
Output Voltage (V)
Output Current (A)
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
ACT4513-001
6.0
5.0
4.0
3.0
2.0
1.0
0.0
CC/CV Curve
VIN = 24V
VIN = 12V
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 2 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ORDERING INFORMATION
PART NUMBER OPERATION TEMPERATURE RANGE PACKAGE PINS PACKING
ACT4513YH-T -40°C to 85°C SOP-8EP 8 TAPE & REEL
PIN CONFIGURATION
PIN DESCRIPTIONS
PIN NAME DESCRIPTION
1 HSB
High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.
Connect a 10nF capacitor from HSB pin to SW pin.
2 IN
Power Supply Input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as
close to the IC as possible.
3 SW Power Switching Output to External Inductor.
4 GND
Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return
FB, COMP, and ISET to this GND, and connect this GND to power GND at a single
point for best noise immunity.
5 FB
Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor
divider between output and GND to set the output voltage.
6 COMP Error Amplifier Output. This pin is used to compensate the converter.
7 EN
Enable Input. EN is pulled up to 5V with a 4A current, and contains a precise 0.8V
logic threshold. Drive this pin to a logic-high or leave unconnected to enable the IC.
Drive to a logic-low to disable the IC and enter shutdown mode.
8 ISET
Output Current Setting Pin. Connect a resistor from ISET to GND to program the
output current.
Exposed Pad Heat Dissipation Pad. Connect this exposed pad to large ground copper area with
copper and vias.
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 3 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ABSOLUTE MAXIMUM RATINGSc
PARAMETER VALUE UNIT
IN to GND -0.3 to 40 V
SW to GND -1 to VIN + 1 V
HSB to GND VSW - 0.3 to VSW + 7 V
FB, EN, ISET, COMP to GND -0.3 to + 6 V
Junction to Ambient Thermal Resistance 50 °C/W
Operating Junction Temperature -40 to 135 °C
Storage Junction Temperature -55 to 150 °C
Lead Temperature (Soldering 10 sec.) 300 °C
c: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may
affect device reliability.
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 4 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Input Voltage 10 40 V
VIN UVLO Turn-On Voltage Input Voltage Rising 9.05 9.35 9.65 V
VIN UVLO Hysteresis Input Voltage Falling 1.1 V
VEN = 3V, VFB = 1V 1.0 mA
VEN = 3V, VOUT = 5V, No load 2.5 mA
Shutdown Supply Current VEN = 0V 75 100 µA
Feedback Voltage 792 808 824 mV
Internal Soft-Start Time 400 µs
Error Amplifier Transconductance VFB = VCOMP = 0.8V, ICOMP = ± 10µA 650 µA/V
Error Amplifier DC Gain 4000 V/V
Switching Frequency VFB = 0.808V 190 210 240 kHz
Foldback Switching Frequency VFB = 0V 30 kHz
Maximum Duty Cycle 88 %
Minimum On-Time 200 ns
COMP to Current Limit Transconductance VCOMP = 1.2V 3.4 A/V
Secondary Cycle-by-Cycle Current Limit Duty = 50% 3.2 A
Slope Compensation Duty = DMAX 0.75 A
ISET Voltage 1 V
ISET to IOUT DC Room Temp Current
Gain IOUT / ISET 25000 A/A
CC Controller DC Accuracy RISET = 19.6k, VIN = 10V - 30V 1274 1300 1326 mA
EN Threshold Voltage EN Pin Rising 0.75 0.8 0.85 V
EN Hysteresis EN Pin Falling 80 mV
EN Internal Pull-up Current 4 µA
High-Side Switch ON-Resistance 0.22
SW Off Leakage Current VEN = VSW = 0V 1 10 µA
Thermal Shutdown Temperature Temperature Rising 155 °C
Standby Supply Current
ELECTRICAL CHARACTERISTICS
(VIN = 14V, TA = 25°C, unless otherwise specified.)
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 5 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
FUNCTIONAL BLOCK DIAGRAM
FUNCTIONAL DESCRIPTION
CV/CC Loop Regulation
As seen in Functional Block Diagram, the ACT4513
is a peak current mode pulse width modulation
(PWM) converter with CC and CV control. The
converter operates as follows:
A switching cycle starts when the rising edge of the
Oscillator clock output causes the High-Side Power
Switch to turn on and the Low-Side Power Switch to
turn off. With the SW side of the inductor now
connected to IN, the inductor current ramps up to
store energy in the magnetic field. The inductor
current level is measured by the Current Sense
Amplifier and added to the Oscillator ramp signal. If
the resulting summation is higher than the COMP
voltage, the output of the PWM Comparator goes
high. When this happens or when Oscillator clock
output goes low, the High-Side Power Switch turns
off.
At this point, the SW side of the inductor swings to
a diode voltage below ground, causing the inductor
current to decrease and magnetic energy to be
transferred to output. This state continues until the
cycle starts again. The High-Side Power Switch is
driven by logic using HSB as the positive rail. This
pin is charged to VSW + 5V when the Low-Side
Power Switch turns on. The COMP voltage is the
integration of the error between FB input and the
internal 0.808V reference. If FB is lower than the
reference voltage, COMP tends to go higher to
increase current to the output. Output current will
increase until it reaches the CC limit set by the ISET
resistor. At this point, the device will transition from
regulating output voltage to regulating output
current, and the output voltage will drop with
increasing load.
The Oscillator normally switches at 210kHz.
However, if FB voltage is less than 0.6V, then the
switching frequency decreases until it reaches a
typical value of 30kHz at VFB = 0.15V.
Enable Pin
The ACT4513 has an enable input EN for turning
the IC on or off. The EN pin contains a precision
0.8V comparator with 75mV hysteresis and a 4µA
pull-up current source. The comparator can be used
with a resistor divider from VIN to program a startup
voltage higher than the normal UVLO value. It can
be used with a resistor divider from VOUT to disable
charging of a deeply discharged battery, or it can be
used with a resistor divider containing a thermistor
to provide a temperature-dependent shutoff
protection for over temperature battery. The
thermistor should be thermally coupled to the
battery pack for this usage.
If left floating, the EN pin will be pulled up to roughly
5V by the internal 4µA current source. It can be
driven from standard logic signals greater than
0.8V, or driven with open-drain logic to provide
digital on/off control.
Thermal Shutdown
The ACT4513 disables switching when its junction
temperature exceeds 155°C and resumes when the
temperature has dropped by 20°C.
EN
FB
BANDGAP,
REGULATOR,
&
SHUTDOWN
CONTROL
+
-
OSCILLATOR
VREF = 0.808V
EMI
CONTROL
PWM
CONTROLLER
CC
CONTROL
SW
HSB
IN
AVIN PVIN
COMP ISET
VREF = 0.808V
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 6 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
(1)
APPLICATIONS INFORMATION
Output Voltage Setting
Figure 1:
Output Voltage Setting
Figure 1 shows the connections for setting the
output voltage. Select the proper ratio of the two
feedback resistors RFB1 and RFB2 based on the
output voltage. Typically, use RFB2 10k and
determine RFB1 from the following equation:
CC Current Setting
ACT4513 constant current value is set by a resistor
connected between the ISET pin and GND. The CC
output current is linearly proportional to the current
flowing out of the ISET pin. The voltage at ISET is
roughly 1V and the current gain from ISET to output
is roughly 25000 (25mA/1µA). To determine the
proper resistor for a desired current, please refer to
Figure 2 below.
Figure 2:
Curve for Programming Output CC Current
CC Current Line Compensation
When operating at constant current mode, the
current limit increase slightly with input voltage. For
wide input voltage applications, a resistor RC is
added to compensate line change and keep output
high CC accuracy, as shown in Figure 3.
Figure 3:
Iutput Line Compensation
Inductor Selection
The inductor maintains a continuous current to the
output load. This inductor current has a ripple that is
dependent on the inductance value:
Higher inductance reduces the peak-to-peak ripple
current. The trade off for high inductance value is
the increase in inductor core size and series
resistance, and the reduction in current handling
capability. In general, select an inductance value L
based on ripple current requirement:
where VIN is the input voltage, VOUT is the output
voltage, fSW is the switching frequency, ILOADMAX is
the maximum load current, and KRIPPLE is the ripple
factor. Typically, choose KRIPPLE = 30% to
correspond to the peak-to-peak ripple current being
30% of the maximum load current.
With a selected inductor value the peak-to-peak
inductor current is estimated as:
The peak inductor current is estimated as:
Output Current vs. RISET
ACT4513-002
Output Current (mA)
RISET (k)
0 10 20 30 40 50 60 70 90 80
2400
2000
1600
1200
800
400
0
⎟
⎠
⎞
⎜
⎝
⎛−= 1
V808.0
V
RR OUT
2FB1FB
(2)
(
)
RIPPLELOADMAXSWIN
OUTINOUT
KIfV
VVV
L
_
×
=
(3)
(
)
SWIN
OUTINOUT
PKLPK fVL
VVV
I××
×
=
_
_
PKLPK
LOADMAXLPK _
I
2
1
II += (4)
Rc
RISET
IN
VIN
ISET
ACT4513
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 7 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
(6)
ESRRIPPLEOUTMAXRIPPLE RKIV =
OUT
2
SW
IN
LCf28
V
×
+
APPLICATIONS INFORMATION CONT’D
The selected inductor should not saturate at ILPK.
The maximum output current is calculated as:
LLIM is the internal current limit, which is typically
3.2A, as shown in Electrical Characteristics Table.
External High Voltage Bias Diode
It is recommended that an external High Voltage
Bias diode be added when the system has a 5V
fixed input or the power supply generates a 5V
output. This helps improve the efficiency of the
regulator. The High Voltage Bias diode can be a
low cost one such as IN4148 or BAT54.
Figure 4:
External High Voltage Bias Diode
This diode is also recommended for high duty cycle
operation and high output voltage applications.
Input Capacitor
The input capacitor needs to be carefully selected
to maintain sufficiently low ripple at the supply input
of the converter. A low ESR capacitor is highly
recommended. Since large current flows in and out
of this capacitor during switching, its ESR also
affects efficiency.
The input capacitance needs to be higher than
10µF. The best choice is the ceramic type,
however, low ESR tantalum or electrolytic types
may also be used provided that the RMS ripple
current rating is higher than 50% of the output
current. The input capacitor should be placed close
to the IN and GND pins of the IC, with the shortest
traces possible. In the case of tantalum or
electrolytic types, they can be further away if a
small parallel 0.1µF ceramic capacitor is placed
right next to the IC.
Output Capacitor
The output capacitor also needs to have low ESR to
keep low output voltage ripple. The output ripple
voltage is:
Where IOUTMAX is the maximum output current,
KRIPPLE is the ripple factor, RESR is the ESR of the
output capacitor, fSW is the switching frequency, L is
the inductor value, and COUT is the output
capacitance. In the case of ceramic output
capacitors, RESR is very small and does not
contribute to the ripple. Therefore, a lower
capacitance value can be used for ceramic type. In
the case of tantalum or electrolytic capacitors, the
ripple is dominated by RESR multiplied by the ripple
current. In that case, the output capacitor is chosen
to have sufficiently low ESR.
For ceramic output capacitor, typically choose a
capacitance of about 22µF. For tantalum or
electrolytic capacitors, choose a capacitor with less
than 50m ESR.
Rectifier Diode
Use a Schottky diode as the rectifier to conduct
current when the High-Side Power Switch is off.
The Schottky diode must have current rating higher
than the maximum output current and a reverse
voltage rating higher than the maximum input
voltage.
(5)
PKLPK
LIMOUTMAX I
2
1
II _
_
=
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 8 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
VOUT C
OUT R
COMP C
COMP C
COMP2c
2.5V 47F Ceramic CAP 5.6k 3.3nF None
3.3V 47F Ceramic CAP 6.2k 3.3nF None
5V 47F Ceramic CAP 8.2k 3.3nF None
2.5V 470F/6.3V/30m 39k 22nF 47pF
3.3V 470F/6.3V/30m 45k 22nF 47pF
5V 470F/6.3V/30m 51k 22nF 47pF
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛×
×
≥
−
OUT
OUT
6
ESRCOUT V012.0,
C
101.1
MinR (15)
(Ω)
(16)
COMP
ESRCOUTOUT
2COMP R
RC
C=
OUTOUT
5
COMP CV102.1C −
×= (F) (14)
(13)
(F)
COMP
5
COMP R
108.1
C
−
×
=
(12)
(Ω)
OUTOUT
8CV1075.2 ×=
V808.0GG10
fCV2
R
COMPEA
SWOUTOUT
COMP ×
=
π
(11)
COMP2COMP
3P CRπ2
1
f=
(10)
(9)
OUTOUT
OUT
2P CVπ2
I
f=
(8)
(7)
COMPVEA
OUT
VDC GA
I
V808.0
A=
STABILITY COMPENSATION
Figure 5:
Stability Compensation
c: CCOMP2 is needed only for high ESR output capacitor
The feedback loop of the IC is stabilized by the
components at the COMP pin, as shown in Figure
3. The DC loop gain of the system is determined by
the following equation:
The dominant pole P1 is due to CCOMP:
The second pole P2 is the output pole:
The first zero Z1 is due to RCOMP and CCOMP:
And finally, the third pole is due to RCOMP and
CCOMP2 (if CCOMP2 is used):
The following steps should be used to compensate
the IC:
STEP 1. Set the cross over frequency at 1/10 of the
switching frequency via RCOMP:
STEP 2. Set the zero fZ1 at 1/4 of the cross over
frequency. If RCOMP is less than 15k, the equation
for CCOMP is:
If RCOMP is limited to 15k, then the actual cross
over frequency is 3.4 / (VOUTCOUT). Therefore:
STEP 3. If the output capacitor’s ESR is high
enough to cause a zero at lower than 4 times the
cross over frequency, an additional compensation
capacitor CCOMP2 is required. The condition for using
CCOMP2 is:
And the proper value for CCOMP2 is:
Though CCOMP2 is unnecessary when the output
capacitor has sufficiently low ESR, a small value
CCOMP2 such as 100pF may improve stability against
PCB layout parasitic effects.
Table 2 shows some calculated results based on
the compensation method above.
Table 1:
Typical Compensation for Different O u tput
Voltages and Output Capacitor s
c: CCOMP2 is needed for high ESR output capacitor.
CCOMP2 47pF is recommended.
CC Loop Stability
The constant-current control loop is internally
compensated over the 750mA-2500mA output
range. No additional external compensation is
required to stabilize the CC current.
Output Cable Resistance Compensation
To compensate for resistive voltage drop across the
charger's output cable, the ACT4513 integrates a
simple, user-programmable cable voltage drop
compensation using the impedance at the FB pin.
Use the curve in Figure 4 to choose the proper
feedback resistance values for cable compensation.
COMPVEA
EA
1P CAπ2
G
f=
COMPCOMP
1Z CRπ2
1
f=
ACT4513
Rev 7, 14-Nov-12
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Copyright © 2012 Active-Semi, Inc.
STABILITY COMPENSATION CONT’D
RFB1 is the high side resistor of voltage divider.
In the case of high RFB1 used, the frequency
compensation needs to be adjusted
correspondingly. As show in Figure 7, adding a
capacitor in paralled with RFB1 or increasing the
compensation capacitance at COMP pin helps the
system stability.
Figure 6:
Cable Compensation at Various Resistor Divider
Values
Figure 7:
Frequency Compensatio n for High RFB1
PC Board Layout Guidance
When laying out the printed circuit board, the
following checklist should be used to ensure proper
operation of the IC.
1) Arrange the power components to reduce the
AC loop size consisting of CIN, IN pin, SW pin
and the schottky diode.
2) Place input decoupling ceramic capacitor CIN as
close to IN pin as possible. CIN is connected
power GND with vias or short and wide path.
3) Return FB, COMP and ISET to signal GND pin,
and connect the signal GND to power GND at a
single point for best noise immunity.
4) Use copper plane for power GND for best heat
dissipation and noise immunity.
5) Place feedback resistor close to FB pin.
6) Use short trace connecting HSB-CHSB-SW loop
Figure 8 shows an example of PCB layout.
Figure 9 and Figure 10 give two typical car charger
application schematics and associated BOM list.
Delta Output Voltage vs. Output Current
ACT4513-003
300
250
200
150
100
50
0
350
400
450
Delta Output Voltage (mV)
Output Current (A)
0 0.4 0.8 1.2 1.6 2
R
FB1
= 300k
R
FB1
= 240k
RFB1 = 150k
R
FB1
= 200k
R
FB1
= 100k
R
FB1
= 360k
R
FB1
= 51k
R
FB1
= 430k
Figure 8: PCB Layout
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 10 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
Figure 10:
Typical Application Circuit for 5V/1.5A Car Charger
Table 3:
BOM List for 5V/1.5A Car Charger
ITEM REFERENCE DESCRIPTION MANUFACTURER QTY
1 U1 IC, ACT4513YH, SOP-8EP Active-Semi 1
2 C1 Capacitor, Electrolytic, 47µF/50V, 6.37mm Murata, TDK 1
3 C2 Capacitor, Ceramic, 10µF/50V, 1210, SMD Murata, TDK 1
4 C3 Capacitor, Ceramic, 2.2nF/6.3V, 0603, SMD Murata, TDK 1
5 C4 Capacitor, Ceramic, 10nF/50V, 0603, SMD Murata, TDK 1
8 L1 Inductor,47µH, 2.1A, 20% Sumida 1
9 D1 Diode, Schottky, 40V/2A, SB240 Diodes 1
10 D2 Diode, 75V/150mA, LL4148 Good-ARK 1
11 R1 Chip Resistor, 16.2k, 0603, 1% Murata, TDK 1
12 R2 Chip Resistor, 52k, 0603, 1% Murata, TDK 1
13 R3 Chip Resistor, 8.2k, 0603, 5% Murata, TDK 1
14 R4 Chip Resistor, 10k, 0603, 1% Murata, TDK 1
6 C5 Capacitor, Electrolytic, 100µF/10V, 6.37mm Murata, TDK 1
7 C6 Capacitor, Ceramic, 1µF/10V, 0603, SMD Murata, TDK 1
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 11 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS
(L = 33µH, CIN = 10µF, COUT = 47µF, Ta = 25°C, RCOMP = 8.2k, CCOMP1 = 2.2nF, CCOMP2 = NC)
ACT4513-004
Efficiency (%)
Load Current (mA)
200 600 1000 1400 1800 2200
100
85
80
75
70
65
60
95
90
Efficiency vs. Load current
ACT4513-007
2200
2000
1900
1800
1700
1600
1500
2100
CC Current (mA)
Temperature (°C)
0 20 40 60 80 100 120
CC Current vs. Temperature
ACT4513-008
CC Current vs. Input Voltage
CC Current (mA)
1900
1800
1700
1600
1500
1400
Input Voltage (V)
10 14 18 22 26 34 30
ACT4513-009
Maximum Peak Current vs. Duty Cycle
Maximum CC Current (mA)
3.8
3.4
3.3
3.2
3.1
3
3.7
3.6
3.5
Duty Cycle
20 30 40 50 60
70
VIN = 12V
VIN = 24V
Input Voltage (V)
10 15 20 25 30 35
ACT4513-005
Switching Frequency vs. Input Voltage
Switching Frequency (kHz)
250
230
210
190
170
150
130
110
ACT4513-006
Switching Frequency vs. Feedback Voltage
Switching Frequency (kHz)
260
210
160
110
60
10
Feedback Voltage (mV)
0 100 200 300 400 500 600 700 800 900
VIN = 12V
VIN = 24V
VOUT = 5V
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 12 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
Start up into CC mode SW vs. Output Voltage Ripples
Start up into CC mode
ACT4513-013
ACT4513-014
ACT4513-015
VOUT = 5V
RLORD = 1.5
IISET = 2A
VIN = 12V
CH1: VOUT, 2V/div
CH2: IOUT, 1A/div
TIME: 200µs/div
CH1: VOUT, 2V/div
CH2: IOUT, 1A/div
TIME: 200µs/div
VIN = 12V
VOUT = 5V
IOUT = 2A
CH1
CH2
CH1: VOUT Ripple, 20mV/div
CH2: SW, 5V/div
TIME: 2µs/div
VOUT = 5V
RLORD = 1.5
IISET = 2A
VIN = 24V
CH1
CH2
CH1
CH2
(L = 33µH, CIN = 10µF, COUT = 47µF, Ta = 25℃, RCOMP = 8.2k, CCOMP1 = 2.2nF, CCOMP2 = NC)
Shutdown Current vs. Input Voltage
ACT4513-010
130
120
110
100
90
80
70
Shutdown Current (µA)
Input Voltage (V)
10 15 20 25 30 35 40
ACT4513-011
Standby Current vs. Input Volta ge
Standby Supply Current (mA)
3.6
3.2
2.8
2.4
2
1.6
1.2
0.8
0.4
0
Input Voltage (V)
0 4 8 12 16 20 24 28 32 36 40
ACT4513-012
Reverse Leakage Current (VIN Floating)
Reverse Leakage Current (µA)
160
120
80
40
0
VOUT (V)
0 1 2 3 4 5
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 13 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
SW vs. Output Voltage Ripple
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
(L = 33µH, CIN = 10µF, COUT = 47µF, Ta = 25℃, RCOMP = 8.2k, CCOMP1 = 2.2nF, CCOMP2 = NC)
ACT4513-016
ACT4513-017
Start up with EN
ACT4513-018
Load Step Waveforms
ACT4513-019
Short Circuit
ACT4513-020
ACT4513-021
VIN = 24V
V0UT = 5V
I0UT = 2A
CH1
CH2
CH1: VRIPPLE, 20mV/div
CH2: SW, 10V/div
TIME: 2µs/div
VIN = 12V
V0UT = 5V
I0UT = 2A
CH1
CH2
CH1: EN, 2V/div
CH2: VOUT, 2V/div
TIME: 400µs//div
Start up with EN
CH1
CH2
CH1: EN, 2V/div
CH2: VOUT, 2V/div
TIME: 400µs//div
VIN = 12V
V0UT = 5V
IISET = 2A
CH1
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 200µs/div
Load Step Waveforms
CH1
CH2
CH1: VOUT, 200mV/div
CH2: IOUT, 1A/div
TIME: 200µs/div
VIN = 12V
V0UT = 5V
IISET = 2A
CH1
CH2
CH1: VOUT, 2V/div
CH2: IOUT, 1A/div
TIME: 100µs/div
VIN = 24V
V0UT = 5V
IISET = 2A
VIN = 24V
V0UT = 5V
IISET = 2A
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 14 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
TYPICAL PERFORMANCE CHARACTERISTICS CONT’D
ACT4513-022
Short Circuit
VIN = 24V
V0UT = 5V
IISET = 2A
CH1
CH2
CH1: VOUT, 2V/div
CH2: IOUT, 1A/div
TIME: 100µs/div
ACT4513-023
Short Circuit Recovery
VIN = 12V
V0UT = 5V
IISET = 2A
CH1
CH2
CH1: VOUT, 2V/div
CH2: IOUT, 2A/div
TIME: 1ms/div
ACT4513-024
Short Circuit Recovery
VIN = 24V
V0UT = 5V
IISET = 2A
CH1
CH2
CH1: VOUT, 2V/div
CH2: IOUT, 2A/div
TIME: 1ms/div
(L = 33µH, CIN = 10µF, COUT = 47µF, Ta = 25℃, RCOMP = 8.2k, CCOMP1 = 2.2nF, CCOMP2 = NC)
ACT4513
Rev 7, 14-Nov-12
Innovative PowerTM - 15 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
PACKAGE OUTLINE
SOP-8EP PACKAGE OUTLINE AND DIMENSIONS
SYMBOL DIMENSION IN
MILLIMETERS DIMENSION IN
INCHES
MIN MAX MIN MAX
A 1.350 1.700 0.053 0.067
A1 0.000 0.100 0.000 0.004
A2 1.350 1.550 0.053 0.061
b 0.330 0.510 0.013 0.020
c 0.170 0.250 0.007 0.010
D 4.700 5.100 0.185 0.200
D1 3.202 3.402 0.126 0.134
E 3.800 4.000 0.150 0.157
E1 5.800 6.200 0.228 0.244
E2 2.313 2.513 0.091 0.099
e 1.270 TYP 0.050 TYP
L 0.400 1.270 0.016 0.050
0° 8° 0° 8°
Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each
product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use
as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of
the use of any product or circuit described in this datasheet, nor does it convey any patent license.
Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact
sales@active-semi.com or visit http://www.active-semi.com.
is a registered trademark of Active-Semi.
