Lo w -Vo lt a g e , P re c is io n S t e p -Do w n
Co n t ro lle r fo r P o rt a b le CP U P o w e r
MAX136
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, SYNC = VL = V , I = 0mA, I
= 0mA, T = 0°C to +85°C, unless otherwise noted. Typical values
CC VL
REF
A
are at T = +25°C.)
A
PARAMETER
INTERNAL VL REGULATOR AND REFERENCE
= 5V, I(VL) = 0
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
60
Regulator Supply Current (V+)
µA
V
= 5V, I(VL) = 0, V+ = 4.5V
CC
500
(includes PNP base current)
Standby Supply Current (V+)
VL Output Voltage
60
µA
V
SHDN = GND, OVP = V
CC
I(VL) = 0 to 25mA, 5V < V+ < 30V
I(VL) = 0 to 25mA, 6V < V+ < 30V
Rising edge, hysteresis = 25mV
Rising edge, hysteresis = 25mV
No REF load
4.5
4.7
5.0
5.0
5.3
5.3
VL Undervoltage Lockout Threshold
3.45
3.60
3.15
1.100
3.75
V
V
VL/ V Switchover Threshold
CC
REF Output Voltage
REF Load Regulation
REF Line Regulation
OSCILLATOR
1.090
1.110
10
V
REF load = 0 to 50µA
mV
mV
V
CC
= 3.3V to 5.5V
3
SYNC = V
270
170
91
300
200
94
330
230
CC
Oscillator Frequency
Maximum Duty Factor
kHz
%
SYNC = GND
SYNC = V
CC
SYNC = GND
93
96
Maximum Duty Factor, Dropout Mode SYNC = GND
SYNC Input Pulse Width High
98
99
%
ns
200
200
SYNC Input Pulse Width Low
ns
SYNC Input Rise/Fall Time
Guaranteed by design
200
340
ns
SYNC Input Frequency Range
OVERVOLTAGE PROTECTION
Overvoltage Trip Threshold
240
4
kHz
FB, with respect to regulation point
7
10
80
-3
%
µs
°C
Overvoltage Fault Propagation Delay
Thermal Shutdown Threshold
FB to DL delay, 22mV overdrive, C
Hysteresis = 10°C
= 2000pF
1.25
150
GATE
Catastrophic Output Undervoltage
Lockout Threshold
% of nominal output
60
70
%
Catastrophic Output Undervoltage
Lockout Delay
From shutdown or power-on-reset state
Falling edge (hysteresis = 1%)
6144
clks
-6
%
RESET Trip Threshold
32768
clks
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
2.4
V
V
SHDN, SKIP, OVP, SYNC
SHDN, SKIP, OVP, SYNC
0.8
1
-1
-3
µA
µA
V
Pin at GND or V ; SKIP, OVP, SYNC
CC
3
SHDN = GND or V+
I
= 4mA
0.4
1
SINK
+5.5V stress voltage applied
µA
_______________________________________________________________________________________
3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
