CM2593/P
2A Step Down VOLTAGE REGULATOR
GENERAL DESCRIPTION
The CM2593/P is a monolithic integrated circuit that
provide all the active functions for a step-down
switching regulator, capable of driving a 2A load
without additional transistor component. Requiring a
minimum number of external component, the board
space can be saved easily. The external shutdown
function can be controlled by TTL logic level and
then
come
into
standby
mode. The
internal
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FEATURES
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3.3V, 5V and adjustable output versions
Adjustable version output voltage range, 1.23V to 37V +4%
max over line and load condition
SOP-8L packages
Voltage mode non-synchronous PWM control
Thermal-shutdown and current-limit protection
ON/OFF shutdown control input
Input voltage range up to 40V
Output load current: 2A
150 kHz fixed frequency internal oscillator
Low power standby mode
Built-in switching transistor on chip
compensation makes feedback control have good
line and load regulation without external design.
Regarding protected function, thermal shutdown is
to prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. The CM2593/P operates at a
switching frequency of 150Khz thus allowing smaller
sized filter components than what would be needed
with lower frequency switching regulators. Other
features include a guaranteed +4% tolerance on
output voltage under specified input voltage and
output load conditions, and +15% on the oscillator
frequency. The output version included fixed 3.3V,
5V, and an adjustable type. The packages are
available in a standard 8-lead SOP8.
APPLICATIONS
Simple High-efficiency step-down(buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Battery / Car Charger
Positive to negative converter
Digital Still and Video Cameras
TYPICAL APPLICATIONS
Figure 1. Basic Application Circuit with CM2593/P fixed version
2007/01/25
Rev. 1.4
Champion Microelectronic Corporation
Page 1
CM2593/P
2A Step Down VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS(All
Output Voltage Versions)
Unless otherwise specified, V
IN
=12V for 3.3V, 5V, adjustable version and V
IN
=24V for the 12V version. I
LOAD
= 0.2A
Symbol
I
B
B
Parameter
Feedback bias current
Conditions
V
FB
=1.3V
(Adjustable version only)
T
J
=25℃
-40℃<=T
J
<=125℃
Min.
Typ.
-10
Max.
-50
-100
173
Unit
nA
127
110
150
150
30
F
OSC
oscillator frequency
Khz
173
60
1.4
1.15
1.5
V
Khz
Fscp
Oscillator frequency of short When current limit occurred
circuit protect
and V
FB
<0.55V
I
OUT
=1.5A
V
SAT
saturation voltage
no outside circuit
V
FB
=0V force driver on
DC
Max. Duty Cycle(ON)
Min. Duty cycle(OFF)
V
FB
=0V force driver on
V
FB
=12V force driver off
peak current
100
0
3.3
2.4
2.8
3.6
%
I
CL
current limit
no outside circuit
V
FB
=0 force driver on
A
I
L
Output = 0
Output = 1
no outside circuit
Output leakage
V
FB
=12 force driver off
current
V
IN
=24V
V
FB
=12 force driver off
ON/OFF pin=5V
V
IN
=24V
Low (regulator ON)
-
2.0
1.3
-200
-5
5
70
10
150
200
0.6
-
uA
mA
mA
uA
I
Q
I
STBY
V
IL
V
IH
Quiescent Current
Standby Quiescent
Current
ON/OFF pin logic input
threshold voltage
ON/OFF pin logic
input current
ON/OFF pin input current
Over temperature shutdown
threshold
High (regulator OFF)
V
I
H
I
L
Ts
V
LOGIC
=2.5V (OFF)
V
LOGIC
=0.5V (ON)
Tj increasing
Tj decreasing
-0.1
175
150
-0.01
-1
uA
o
C
2007/01/25
Rev. 1.4
Champion Microelectronic Corporation
Page 4
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