Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
MAX1887/MAX1897
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= 5V, V
OUT
= V
COMP
= 1.2V, V
CM+
= V
CM-
= V
CS+
= V
CS-
= 1.2V,
SHDN
= V
CC
(MAX1897),
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
LOGIC
Logic Input High Voltage
(MAX1897)
Logic Input Low Voltage
(MAX1897)
TRIG Logic Levels
V
IH
V
IL
V
TRIG
SHDN,
POL; V
CC
= 4.5V to 5.5V
SHDN,
POL; V
CC
= 4.5V to 5.5V
350mV hysteresis
High
Low
V
CC
- 0.4
1.5
-1
-1
-2
-2
3.1
0.5
+1
+1
+1
+3
µA
V
3.0
1.2
2.4
0.8
V
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Logic high (V
CC
; 200kHz operation)
TON Logic Levels (MAX1897)
V
TON
Open (300kHz operation)
Logic low (GND; 550kHz operation)
TRIG
Logic Input Current
SHDN
(MAX1897)
POL (MAX1897)
TON = GND or V
DD
(MAX1897)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= 5V, V
OUT
= V
COMP
= 1.2V, V
CM+
= V
CM-
= V
CS+
= V
CS-
= 1.2V,
SHDN
= V
CC
(MAX1897),
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 5)
PARAMETER
PWM CONTROLLER
MAX1887 (300kHz), V+ = 12V, V
COMP
= 1.2V
On Time (Note 3)
t
ON
MAX1897,
V+ = 12V,
V
COMP
= 1.2V
TON = GND (550kHz)
TON = open (300kHz)
TON = V
CC
(200kHz)
320
171
320
464
390
209
390
566
40
800
5
800
5
40
5
40
5
5
µA
µA
µA
µA
µA
µA
µA
µA
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY CURRENTS
Quiescent Supply Current (V+)
Quiescent Supply Current (V
DD
)
(Note 3)
Quiescent Supply Current (V
CC
)
(MAX1897, Note 3)
Standby Supply Current (V+)
Standby Supply Current (V
DD
)
(Note 3)
Standby Supply Current (V
CC
)
(MAX1897, Note 3)
Shutdown Supply Current (V+)
(MAX1897)
Shutdown Supply Current (V
DD
)
(MAX1897, Note 3)
I+
I
DD
I
CC
Measured at V+; V
ILIM
> 0.35V
Measured at V
DD
;
V
ILIM
> 0.35V
MAX1887
MAX1897
Measured at V
CC
; V
ILIM
> 0.35V
Measured at V+; ILIM = GND
Measured at V
DD
;
ILIM = GND
MAX1887
MAX1897
Measured at V
CC
; ILIM = GND
Measured at V+; V
CC
= V
DD
= 0 or 5V,
SHDN
= GND
Measured at V
DD
;
SHDN
= GND
4
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