MAX1637 Datasheet, PDF (4/20 Pages) Maxim Integrated Products – Miniature, Low-Voltage, Precision Step-Down Controller

Miniature, Low-Voltage,
Precision Step-Down Controller
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V_CC = V_GG = 5V, SYNC = V_CC, I_REF = 0mA, T_A = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
OVERVOLTAGE PROTECTION
Overvoltage Trip Threshold
FB, with respect to regulation point
Output Undervoltage Lockout Threshold % of nominal output
INPUTS AND OUTPUTS
Logic Input Voltage High
SHDN, SKIP, SYNC
Logic Input Voltage Low
SHDN, SKIP, SYNC
MIN TYP MAX
4.0
10
60
80
2.4
0.8
Note 1: Guaranteed by design, not production tested.
Note 2: Specifications from -40°C to 0°C are guaranteed by design and not production tested.
UNITS
%
%
V
V
__________________________________________Typical Operating Characteristics
(V_OUT = 3.3V, T_A = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(1.7V/7A CIRCUIT)
100
SKIP = LOW
90
V_BATT = 7V
80
V_BATT = 15V
V_BATT = 22V
70
60
50
0.01
0.1
1
10
LOAD CURRENT (A)
EFFICIENCY vs. LOAD CURRENT
(2.5V/3A CIRCUIT)
100
SKIP = LOW
V_BATT = 22V
90
80
V_BATT = 15V
70
V_BATT = 7V
60
50
40
30
20
10
0
0.001 0.01
0.1
1
10
LOAD CURRENT (A)
EFFICIENCY vs. LOAD CURRENT
(2.5V/2A CIRCUIT)
100
SKIP = LOW
90
V_BATT = 7V
80
70
V_BATT = 15V
V_BATT = 22V
60
50
0.01
0.1
1
10
LOAD CURRENT (A)
EFFICIENCY vs. LOAD CURRENT
(3.3V/3A CIRCUIT)
100
SKIP = LOW
90
80
V_BATT = 15V V_BATT = 5V
70
V_BATT = 30V
60
50
0.01
0.1
1
10
LOAD CURRENT (A)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
20
I_LOAD = 1A
V_OUT = 3.3V
15
10
SKIP = HIGH
5
SKIP = LOW
SUPPLY CURRENT
vs. LOAD CURRENT
20
SKIP = LOW
15
SYNC = HIGH
10
SYNC = LOW
5
0
3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
0
01234 56 78 9
LOAD CURRENT (A)
4 _______________________________________________________________________________________