Rainbow Electronics MAX8707 - Manual (Page 8)

MAX8707
Multiphase, Fixed-Frequency Controller for
AMD Hammer CPU Core Power Supplies
8 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V
CC
= V SHDN = 5V, OSC = REF, V
VPS
= V
FBS
= V
CRSN
= V
CRSP
= V
CSP_
= 1.20V, V
SUSV
= 0.8V, OFS = SUS =
GNDS = PGND = SKIP = GND, D0–D4 set for 1.20V (D0–D4 = 01110). T
A
= -40°C to +85°C, unless otherwise specified.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
V PKLIMIT = 30mV 24 36
ILIM(PK) Peak Current-Limit
Threshold Voltage (Positive)
V PKLIMIT
CSP_ - CSN_,
R
ILIM(PK) = R TRC x
8V / V LIM(PK)
V PKLIMT = 50mV 40 60
mV
ILIM(PK) Peak Current-Limit
Threshold Voltage (Negative)
CSP_ - CSN_,
R
ILIM(PK) = R TRC x 8V / V PKLIMIT ,
V PKLIMIT = 50mV
-60 -40 mV
ILIM(PK) Idle Current-Limit
Threshold Voltage (Skip Mode)
V IDLE
C S P _ - C S N _, V S KI P
≥ 1.2V ,
R I LI M ( P K ) = R T RC x 8V / V P KL IM IT ,
V P KL IM IT = 50m V
2 8 mV
CSP_, CRSP -0.2 +0.2
Current-Sense Input Current
CSN_, CRSN -1.0 +1.0
µA
Current-Sense Common-Mode
Input Range
CRSP, CRSN, CSP_, CSN_ 0 2 V
Phase Disable Threshold CSP4 3
V CC
- 0.4
V
CRS Sense Input Disable
Threshold
CRSP 3
V CC
- 0.4
V
LOGIC AND I/O
Logic Input High Voltage V IH
SHDN, SUS 2.4 V
Logic Input Low Voltage V IL
SHDN, SUS 0.8 V
D0–D4 Logic Input High Voltage 0.8 V
D0–D4 Logic Input Low Voltage 0.4 V
High (V CC )
V CC
- 0.4
Medium (REF) 1.8 2.2
OSC 3-Level Input Logic Levels V OSC
Low (GND) 0.4
V
High 1.2
SKIP Input Logic Levels V
SKIP
Low (GND) 0.8
V
Logic Output High Voltage V OH PWM_, DRSKP; I SOURCE = 3mA
V CC
- 0.4
V
Note 2: VROK is blanked during the transitions, when the internal target is being slewed. See the Output-Voltage Transition Timing
section. VROK is reenabled in t BLANK (20µs) after the transition is completed.
Note 3: Specifications to T A = -40°C are guaranteed by design and are not production tested.