MAX1636 Datasheet, PDF (3/24 Pages) Maxim Integrated Products – Low-Voltage, Precision Step-Down Controller for Portable CPU Power

Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, SYNC = VL = V_CC, I_VL = 0mA, I_REF = 0mA, T_A = 0°C to +85°C, unless otherwise noted. Typical values
are at T_A = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
INTERNAL VL REGULATOR AND REFERENCE
Regulator Supply Current (V+)
V_CC = 5V, I(VL) = 0
V_CC = 5V, I(VL) = 0, V+ = 4.5V
(includes PNP base current)
60
µA
500
Standby Supply Current (V+)
VL Output Voltage
SHDN = GND, OVP = V_CC
I(VL) = 0 to 25mA, 5V < V+ < 30V
I(VL) = 0 to 25mA, 6V < V+ < 30V
60
µA
4.5
5.0
5.3
V
4.7
5.0
5.3
VL Undervoltage Lockout Threshold Rising edge, hysteresis = 25mV
3.45 3.60 3.75
V
VL/ V_CC Switchover Threshold
REF Output Voltage
Rising edge, hysteresis = 25mV
No REF load
3.15
V
1.090 1.100 1.110
V
REF Load Regulation
REF load = 0 to 50µA
10
mV
REF Line Regulation
V_CC = 3.3V to 5.5V
3
mV
OSCILLATOR
Oscillator Frequency
SYNC = V_CC
SYNC = GND
270
300
330
kHz
170
200
230
Maximum Duty Factor
SYNC = V_CC
SYNC = GND
91
94
%
93
96
Maximum Duty Factor, Dropout Mode SYNC = GND
98
99
%
SYNC Input Pulse Width High
200
ns
SYNC Input Pulse Width Low
200
ns
SYNC Input Rise/Fall Time
Guaranteed by design
200
ns
SYNC Input Frequency Range
240
340
kHz
OVERVOLTAGE PROTECTION
Overvoltage Trip Threshold
FB, with respect to regulation point
4
7
10
%
Overvoltage Fault Propagation Delay FB to DL delay, 22mV overdrive, C_GATE = 2000pF
1.25
µs
Thermal Shutdown Threshold
Hysteresis = 10°C
150
°C
Catastrophic Output Undervoltage
Lockout Threshold
% of nominal output
60
70
80
%
Catastrophic Output Undervoltage
Lockout Delay
RESET Trip Threshold
RESET Delay Time
INPUTS AND OUTPUTS
Logic Input Voltage High
Logic Input Voltage Low
Logic Input Bias Current
SHDN Input Bias Current
RESET Output Voltage Low
RESET Output Leakage Current
From shutdown or power-on-reset state
Falling edge (hysteresis = 1%)
SHDN, SKIP, OVP, SYNC
SHDN, SKIP, OVP, SYNC
Pin at GND or V_CC; SKIP, OVP, SYNC
SHDN = GND or V+
I_SINK = 4mA
+5.5V stress voltage applied
6144
clks
-6
-3
%
32768
clks
2.4
V
0.8
V
-1
1
µA
-3
3
µA
0.4
V
1
µA
_______________________________________________________________________________________ 3