MAX727CCK Maxim Integrated Products, MAX727CCK Datasheet - Page 4

• Manufacturer Part Number: MAX727CCK
• Description: IC DC/DC REG STEP-DN PWM TO220-5
• Manufacturer: Maxim Integrated Products
• Type: Step-Down (Buck)r

Specifications of MAX727CCK

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 2A
• Frequency - Switching: 100kHz
• Voltage - Input: 8 ~ 40 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: TO-220-5 (Straight Leads)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

ELECTRICAL CHARACTERISTICS (continued)
(V
Note 1: Do not exceed switch-to-input voltage limitation.
Note 2: For switch currents between 1A and 2A, maximum switch-on voltage can be calculated via linear interpolation.
Note 3: By setting the SENSE pin to 5.5V, the V
Note 4: For proper regulation, total voltage from V
Note 5: To avoid extremely short switch-on times, the switch frequency is internally scaled down when V
Note 6: Guaranteed, not production tested.
SENSE Voltage
SENSE Pin Divider Resistance
______________________________________________________________Pin Description
Output Voltage Tolerance
Output Voltage Line Regulation
V
V
Thermal Resistance Junction to Case
(Note 6)
IN
C
C
Voltage
Voltage Temperature Coefficient
= 25V, T
PIN
1
2
3
4
5
approximating the zero load condition.
(MAX727), 2.0V (MAX728), or 1.8V (MAX729). Switch current limit is tested with V
switch-on time.
PARAMETER
j
= T
MIN
SENSE
NAME
to T
_______________________________________________________________________________________
GND
V
V
V
SW
IN
C
MAX
, unless otherwise noted.)
SENSE Input is the internal error amplifier's input, and should be directly connected to V
SENSE also aids current limiting by reducing oscillator frequency when V
Error-Amplifier Output. A series RC network connected to this pin compensates the
MAX727/MAX728/MAX729. Output swing is limited to about 5.8V in the positive direction and
-0.7V in the negative direction. V
external TTL clock in the 115kHz to 170kHz range. See MAX724/MAX726 data sheet.
Ground requires a short, low-noise connection to ensure good load regulation. The internal refer-
ence is referred to GND, so errors at this pin are multiplied by the error amplifier.
Internal Power Switch Output. The
V
switch. V
IN
supplies power to the internal circuitry and also connects to the collector of the internal power
V
T
V
3.3V (MAX728), or 3V (MAX729);
all conditions of input voltage,
output voltage, and load
current
8V ≤ V
0% duty cycle
0% duty cycle
j
C
OUT
= +25°C
= 2V
IN
5V/3.3V/3V 2A Step-Down, PWM,
(nominal) = 5V (MAX727),
must be bypassed with a low-ESR capacitor, typically 200µF or 220µF.
Switch-Mode DC-DC Regulators
IN
C
≤ 40V
pin is forced to its low clamp level and the switch duty cycle is forced to zero,
IN
to GND must be ≥ 8V after start-up.
CONDITIONS
C
can also synchronize the MAX727/MAX728/MAX729 to an
S
witch output can swing 35V below ground and is rated for 2A.
T
T
T
T
T
MAX727
MAX728
MAX729
MAX727
MAX728
MAX729
j
MAX
j
j
j
= T
= T
= +25°C
= +25°C
MIN
MIN
FUNCTION
to T
to
MAX
SENSE
4.85
3.20
2.90
MIN
3.0
2.5
2.2
adjusted to give a 1µs minimum
0.005
TYP
5.00
3.30
3.00
±0.5
±1.0
5.0
4.2
3.8
1.5
SENSE
-4
OUT
is less than 2.6V
is low.
0.020
MAX
5.15
3.40
3.10
±2.0
±3.0
8.0
7.0
6.5
4.0
OUT
UNITS
mV/°C
°C/W
.
%/V
kΩ
%
V
V
3