ZA3020 Ver la hoja de datos (PDF) - Unspecified
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ZA3020 Datasheet PDF : 10 Pages
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ZA3020
2A Step-Down, PWM, Switch-Mode
DC-DC Regulators
General Description
The ZA3020 is a monolithic step down switch
mode converter with a built in internal Power
MOSFET. It achieves 2A continuous output
current over a wide input supply range with
excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-
cycle current limiting and thermal shutdown. In
shutdown mode the regulator draws 23µA of
supply current.
The ZA3020 requires a minimum number of
readily available standard external
components. A synchronization pin allows the
part to be driven to 600KHz.
Ordering Information
Part Number ∗ Package
Temperature
ZA3020DS
SOIC8
-40 to +125 °C
. For Tape & Reel use suffix - Z (e.g. ZA3020DS-Z)
∗
Features
2A Output Current
0.18ȍ Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
capacitors
Up to 95% Efficiency
20µA Shutdown Mode
Fixed 380kHz frequency
Thermal Shutdown
Cycle-by-cycle over current protection
Wide 4.75 to 25V operating input range
Output Adjustable from 1.22 to 21V
Programmable under voltage lockout
Frequency Synchronization Input
Available in 8 pin SO package
Evaluation Board Available
Applications
Distributed Power Systems
Battery Charger
Pre-Regulator for Linear Regulators
Figure 1: Typical Application Circuit
VIN
4.75 to 25V
IN
ENABLE
SHUTDOWN
OPEN
NOT USED
IN
BS
SW
EN ZA3020
SNYC
FB
GND
COMP
VOUT
2.5V/2A
Efficiency versus Output
Current and Voltage. VIN=10V
95
5.0V
90
3.3V
85
2.5V
80
75
70
0
0.5
1
1.5
2
Output Current (A)
ZA3020 Rev. 3.5 2003-04-22
www.vimicro.com
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