Rainbow Electronics MAX1636 - Manual (Page 3)

MAX1636
Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
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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.)
%
FB to DL delay, 22mV overdrive, C GATE = 2000pF
SHDN = GND, OVP = V
CC
FB, with respect to regulation point
V
CC
= 5V, I(VL) = 0, V+ = 4.5V
(includes PNP base current)
V CC = 5V, I(VL) = 0
Guaranteed by design
SYNC = V
CC
SYNC = GND
SYNC = V CC
I(VL) = 0 to 25mA, 5V < V+ < 30V
I(VL) = 0 to 25mA, 6V < V+ < 30V
Rising edge, hysteresis = 25mV
SYNC = GND
REF load = 0 to 50µA
SYNC = GND
°C 150
µs 1.25
% 4 7 10
kHz 240 340 SYNC Input Frequency Range
ns 200 SYNC Input Rise/Fall Time
ns 200 SYNC Input Pulse Width Low
200
Maximum Duty Factor, Dropout Mode 98 99
93 96
µA 60 Standby Supply Current (V+)
µA
500
Regulator Supply Current (V+)
60
91 94
170 200 230
270 300 330
kHz
V
4.5 5.0 5.3
4.7 5.0 5.3
VL Output Voltage
V 3.15 VL/ V CC Switchover Threshold
mV 10 REF Load Regulation
Hysteresis = 10°C
Rising edge, hysteresis = 25mV V 3.45 3.60 3.75 VL Undervoltage Lockout Threshold
No REF load V 1.090 1.100 1.110 REF Output Voltage
V CC = 3.3V to 5.5V mV 3 REF Line Regulation
Oscillator Frequency
%
ns SYNC Input Pulse Width High
Maximum Duty Factor
Overvoltage Trip Threshold
Thermal Shutdown Threshold
Overvoltage Fault Propagation Delay
%
Pin at GND or V CC ; SKIP, OVP, SYNC
SHDN, SKIP, OVP, SYNC
SHDN, SKIP, OVP, SYNC
Falling edge (hysteresis = 1%)
From shutdown or power-on-reset state
% of nominal output
V 0.4 RESET Output Voltage Low
µA -1 1
V 0.8
V 2.4 Logic Input Voltage High
clks
Catastrophic Output Undervoltage
Lockout Delay
Logic Input Voltage Low
Logic Input Bias Current
clks 32768 RESET Delay Time
% -6 -3 RESET Trip Threshold
6144
Catastrophic Output Undervoltage
Lockout Threshold
60 70 80
I SINK = 4mA
+5.5V stress voltage applied µA 1 RESET Output Leakage Current
CONDITIONS UNITS MIN TYP MAX PARAMETER
SHDN = GND or V+ µA -3 3 SHDN Input Bias Current
INTERNAL VL REGULATOR AND REFERENCE
OSCILLATOR
OVERVOLTAGE PROTECTION
INPUTS AND OUTPUTS