MAX1887 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1887 Datasheet PDF : 33 Pages
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Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = 5V, VOUT = VCOMP = 1.2V, VCM+ = VCM- = VCS+ = VCS- = 1.2V, SHDN = VCC
(MAX1897), TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
LOGIC
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Logic Input High Voltage
(MAX1897)
VIH
SHDN, POL; VCC = 4.5V to 5.5V
2.4
V
Logic Input Low Voltage
(MAX1897)
TRIG Logic Levels
TON Logic Levels (MAX1897)
Logic Input Current
VIL
VTRIG
VTON
SHDN, POL; VCC = 4.5V to 5.5V
350mV hysteresis
High
Low
Logic high (VCC; 200kHz operation)
Open (300kHz operation)
Logic low (GND; 550kHz operation)
TRIG
SHDN (MAX1897)
POL (MAX1897)
TON = GND or VDD (MAX1897)
3.0
VCC - 0.4
1.5
-1
-1
-2
-2
0.8
V
V
1.2
3.1
V
0.5
+1
+1
µA
+1
+3
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, VCC = VDD = 5V, VOUT = VCOMP = 1.2V, VCM+ = VCM- = VCS+ = VCS- = 1.2V, SHDN = VCC
(MAX1897), TA = -40°C to +85°C, unless otherwise noted.) (Note 5)
PARAMETER
SYMBOL
CONDITIONS
MIN
PWM CONTROLLER
On Time (Note 3)
SUPPLY CURRENTS
MAX1887 (300kHz), V+ = 12V, VCOMP = 1.2V
320
tON
MAX1897,
V+ = 12V,
TON = GND (550kHz) 171
TON = open (300kHz) 320
VCOMP = 1.2V
TON = VCC (200kHz)
464
Quiescent Supply Current (V+)
I+
Measured at V+; VILIM > 0.35V
Quiescent Supply Current (VDD)
(Note 3)
IDD
Measured at VDD;
VILIM > 0.35V
MAX1887
MAX1897
TYP MAX UNITS
390
209
ns
390
566
40
µA
800
µA
5
Quiescent Supply Current (VCC)
(MAX1897, Note 3)
ICC
Measured at VCC; VILIM > 0.35V
800
µA
Standby Supply Current (V+)
Standby Supply Current (VDD)
(Note 3)
Measured at V+; ILIM = GND
Measured at VDD;
ILIM = GND
MAX1887
MAX1897
5
µA
40
µA
5
Standby Supply Current (VCC)
(MAX1897, Note 3)
Measured at VCC; ILIM = GND
40
µA
Shutdown Supply Current (V+)
(MAX1897)
Measured at V+; VCC = VDD = 0 or 5V,
SHDN = GND
5
µA
Shutdown Supply Current (VDD)
(MAX1897, Note 3)
Measured at VDD; SHDN = GND
5
µA
4 _______________________________________________________________________________________
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