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MAX8576EUB+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
MAX8576–MAX8579
3V to 28V Input, Low-Cost, Hysteretic
Synchronous Step-Down Controllers
4 _______________________________________________________________________________________
Note 1: Guaranteed by design.
Note 2: This current linearly compensates for the MOSFET temperature coefficient.
Note 3: Specifications to -40
°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V (MAX8576/MAX8577 only), 4.7µF capacitor from VL (MAX8576/MAX8577 only) or V
CC
(MAX8578/MAX8579 only) to GND;
V
CC
= V
EN
= 5V (MAX8578/MAX8579 only); 0.01µF capacitor from SS to GND; V
FB
= 0.65V; V
BST
= 5V; V
LX
= V
GND
= 0V; V
OCSET
=
11.5V; DH = unconnected; DL = unconnected; T
A
= -40°C to +85°C, unless otherwise noted. Note 3)
PARAMETER CONDITIONS
MIN TYP MAX
Rising
2.75 2.90
VL or V
CC
Undervoltage Lockout
(UVLO)
Falling
2.40 2.55
V
V
IN
= 12V 2
V
IN
= V
VL
= 5V 3.5
No switching, V
FB
= 0.65V
(MAX8576/MAX8577)
V
IN
= V
VL
= 3.3V 2
V
CC
= 5V 2
Supply Current
V
EN
= 0V or V
FB
= 0.65V, no
switching (MAX8578/MAX8579)
V
CC
= 3.3V 2
mA
REGULATOR
Output Regulation Accuracy V
FB
peak
0.591 0.607
V
Overvoltage-Protection (OVP)
Threshold
0.70 0.80
V
High-Side Current-Sense Over-
Current Trip Adjustment Range
V
IN
- V
OCSET
0.05 0.40
V
DRIVER SPECIFICATIONS
Sourcing current 4
DH Driver Resistance
Sinking current 3.0
Ω
Sourcing current 4.0
DL Driver Resistance
Sinking current 2.0
Ω
DH Minimum On-Time
245
ns
DL Minimum On-Time Normal operation
220
ns
EN
Input Voltage Low V
CC
= 3V, MAX8578/MAX8579 0.7 V
Input Voltage High V
CC
= 5.5V, MAX8578/MAX8579 1.5 V
MAX8576–MAX8579
3V to 28V Input, Low-Cost, Hysteretic
Synchronous Step-Down Controllers
_______________________________________________________________________________________ 5
EFFICIENCY vs. LOAD CURRENT
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
101
10
20
30
40
50
60
70
80
90
100
0
0.1 100
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
IN
= 12V
EFFICIENCY vs. LOAD CURRENT
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
1
10
20
30
40
50
60
70
80
90
100
0
0.1 10
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
V
IN
= 12V
LOAD REGULATION
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc03
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
105
1.76
1.77
1.78
1.79
1.80
1.81
1.82
1.83
1.84
1.75
015
LINE REGULATION
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc04
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
201510
1.80
1.81
1.82
1.83
1.84
1.85
1.79
525
0A LOAD
15A LOAD
LINE REGULATION
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
201510
1.72
1.74
1.78
1.80
1.82
1.84
1.86
1.70
525
NO LOAD
5A LOAD
1.76
SWITCHING FREQUENCY vs. INPUT
VOLTAGE (CIRCUIT OF FIGURE 3)
MAX8576-79 toc06
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
201510
250
300
350
400
500
550
600
200
525
450
LOAD TRANSIENT
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc07
40μs/div
I
OUT
V
OUT
50mV/div
AC-COUPLED
6A
12A
LOAD TRANSIENT
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc08
40μs/div
I
OUT
V
OUT
50mV/div
AC-COUPLED
5A
2.5A
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX8576–MAX8579
3V to 28V Input, Low-Cost, Hysteretic
Synchronous Step-Down Controllers
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
( T
A
= +25°C, unless otherwise noted.)
POWER-DOWN
(CIRCUIT OF FIGURE 2, MAX8576)
MAX8576-79 toc13
4ms/div
V
IN
V
OUT
I
LX
5V/div
0
1V/div
0
0
10A/div
STARTUP AND SHUTDOWN
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc14
400μs/div
V
EN
V
DL
V
OUT
I
LX
2V/div
0
10V/div
1V/div
0
0
5A/div
0
POWER-DOWN V
CC
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc11
400μs/div
V
IN
V
CC
V
OUT
I
LX
10V/div
0
5V/div
1V/div
5A/div
0
POWER-UP
(CIRCUIT OF FIGURE 2)
MAX8576-79 toc12
1ms/div
V
IN
V
OUT
I
LX
10V/div
0
1V/div
0
0
10A/div
POWER-UP V
IN
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc09
400μs/div
V
IN
V
CC
V
OUT
I
LX
10V/div
0
5V/div
1V/div
5A/div
0
POWER-UP V
CC
(CIRCUIT OF FIGURE 3)
MAX8576-79 toc10
400μs/div
V
IN
V
CC
V
OUT
I
LX
10V/div
0
5V/div
1V/div
5A/div
0
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX8576EUB+

Mfr. #:
Buy MAX8576EUB+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers 3-28V Hystrtic Synch Step-Down Controller
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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