MAX1557ETB-T Maxim Integrated Products, MAX1557ETB-T Datasheet - Page 7

• Manufacturer Part Number: MAX1557ETB-T
• Description: DC/DC Switching Converters 16uA IQ 1.2A PWM Step-Down
• Manufacturer: Maxim Integrated Products

Figure 1. Functional Diagram
Figure 2. MAX1556 Typical Application Circuit
0.47µF
INPUT
2.6V TO 5.5V
100Ω
C4
R1
VOLTAGE
OFF
SELECT
10µF
C1
ON
_______________________________________________________________________________________
INP
IN
D1
D2
SHDN
MAX1556A
MAX1556
SHDN
GND
IN
PGND
OUT
LX
SS
CURRENT
SENSE
SLOPE
COMP
BIAS
REFERENCE
3.3µH
1.25V
L1
22µF
C2
V
CS
0.75V TO V
C3
1000pF
OUTPUT
0.675V
AMPLIFIER
1.2A
ERROR
IN
16µA I
CURRENT-LIMIT
COMPARATOR
COMPARATOR
CLOCK
1MHz
PWM
SS
Figure 3. MAX1557 Typical Application Circuit
Step-Down Converters
ENTER SKIP/
AUTO SKIP
SKIP-OVER
CONTROL
INPUT
2.6V TO 5.5V
SR OFF
PWM
VOLTAGE
SELECT
Q
MAX1556A
MAX1556
MAX1557
SELECTOR
OFF
VOLTAGE
OUTPUT
10µF
, 1.2A PWM DC-DC
C4
ON
SHORT-CIRCUIT
PROTECTION
ZERO-CROSS
DETECT
INP
IN
D1
D2
SHDN
MAX1557
GND
INP
LX
PGND
OUT
GND
D1
D2
PGND
OUT
LX
SS
4.7µH
L2
22µF
C5
0.75V TO V
C6
1000pF
OUTPUT
600mA
IN
7