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ACT4060B Schematic ( PDF Datasheet ) - Active-Semi

Teilenummer ACT4060B
Beschreibung 18V/2A Step-Down DC/DC Converter
Hersteller Active-Semi
Logo Active-Semi Logo 




Gesamt 16 Seiten
ACT4060B Datasheet, Funktion
® ACT4060B
Rev 1, 23-May-12
18V/2A Step-Down DC/DC Converter
FEATURES
2A Output Current
Wide 4.5V to 18V Operating Input Range
Synchronous Buck Topology
Integrated 130mPower MOSFET Switches
Output Adjustable from 0.923V to 12V
Up to 96% Efficiency
Stable with Low ESR Ceramic Output
Capacitors
Internal Soft Start
1.5mA Low Standby Input Current
High Light Load Efficiency
Cycle-by-Cycle Over Current Limit
Input Under Voltage Lockout
Hiccup Protection at Short Circuit and Over
Current
Low Power Loss at Output Short
Frequency Fold Back Protection
Low Power Dissipation at Over Current and
Short Circuit
APPLICATIONS
LCD-TV
Set-top Box
Distributed Power Systems
Networking Systems
GENERAL DESCRIPTION
ACT4060B is a monolithic synchronous buck
regulator. The device integrates two 130m
MOSFETs, and provides 2A of continuous load
current over a wide input voltage of 4.5V to 18V.
Current mode control provides fast transient
response and cycle-by-cycle current limit. Hiccup at
short circuit reduces IC temperatures.
An internal soft-start prevents inrush current at turn-
on, and in shutdown mode the supply current drops
to 10μA. Pulse-skipping mode at light load reduces
standby power down to 1.5mA.
This device, available in an 8-pin SOP package,
provides a very compact solution with minimal
external components.
Innovative PowerTM
Efficiency vs. Load Current
100
95 VIN = 7V
90
85 VIN = 18V
80
75 VIN = 12V
70
65
60
55
10
VOUT = 5V
100
1000
10000
Load Current (mA)
- 1 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.






ACT4060B Datasheet, Funktion
®
Secondary Over Current Protection
(SOCP)
In normal operation, ACT4060B high-side FET
current is protected by cycle-by-cycle current limit.
In some fault conditions, the input current may run
away. SOCP current limit is set 30% higher than
cycle-by-cycle current limit, and once SOCP is
triggered, ACT4060B goes into hiccup mode and
reduce the power dissipation significantly.
Enable Pin
The ACT4060B has an enable input EN for turning
the IC on or off. The EN pin contains a precision
2.5V comparator with 75mV hysteresis and a 1.3μA
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. If left
floating, the EN pin will be pulled up to roughly 5V
by the internal 1.3μA current source. It can be
driven from standard logic signals greater than
2.5V, or driven with open-drain logic to provide
digital on/off control.
Thermal Shutdown
The ACT4060B disables switching when its junction
temperature exceeds 160°C and resumes when the
temperature has dropped by 30°C.
ACT4060B
Rev 1, 23-May-12
Innovative PowerTM
- 6 - www.active-semi.com
Copyright © 2012 Active-Semi, Inc.

6 Page









ACT4060B pdf, datenblatt
®
TYPICAL PERFORMANCE CHARACTERISTICS
(L = 22µH, CIN = 100µF, COUT = 330µF, Ta = 25°C, RCOMP = 15k, CCOMP1 = 2.2nF, CCOMP2 = N/C)
ACT4060B
Rev 1, 23-May-12
Efficiency vs. Load Current
100
95 VIN = 7V
90
85 VIN = 18V
80
75 VIN = 12V
70
65
60
55
10
VOUT = 5V
100
1000
10000
Load Current (mA)
400
350
300
250
200
150
100
50
0
0
Frequency vs. FB Voltage
200 400 600 800 1000
FB Voltage (V)
0.932
FB Voltage vs. IC Temperature
0.929
0.926
0.923
0.92
0.917
0.914
0.911
20 40 60 80 100 120 140 160
Temperature (°C)
Frequency vs. VIN
420
400
380
360
340
320
300
280
5 7 9 11 13 15 17 19 21
VIN Voltage (V)
FB Voltage vs. Load Current
0.95
0.94
0.93
0.92
0.91
0.9
0
400
800
1200
1600
Load Current (mA)
2000
Shutdown Current vs. VIN
24
21
18
15
12
9
6
3
0
2 4 6 8 10 12 14 16 18 20 22
VIN Voltage (V)
Innovative PowerTM
- 12 -
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.

12 Page





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