ZA3020
| Model | ZA3020 |
| Description | 2A STEP DOWN PWM SWITCH MODE DC DC REGULATORS |
| PDF file | Total 10 pages (File size: 134K) |
| Chip Manufacturer | ETC |
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.
Features
2A Output Current
0.18 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
Ordering Information
Part Number
∗
Package
ZA3020DS
∗
SOIC8
Temperature
-40 to +125
°C
. For Tape & Reel use suffix - Z (e.g. ZA3020DS-Z)
Figure 1: Typical Application Circuit
Efficiency versus Output
Current and Voltage. V
IN
=10V
V
IN
4.75 to 25V
IN
95
IN
BS
90
5.0V
SW
Efficiency (%)
ENABLE
SHUTDOWN
OPEN
NOT USED
EN
SNYC
ZA3020
GND
V
OUT
2.5V/2A
3.3V
85
FB
COMP
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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