Electrical characteristics – Rainbow Electronics MAX8707 User Manual
Page 6
MAX8707
Multiphase, Fixed-Frequency Controller for
AMD Hammer CPU Core Power Supplies
6
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(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
PWM CONTROLLER
Input Voltage Range
V
CC
4.5
5.5
V
DAC codes from
1.10V to 1.55V
-1.0
+1.0
DAC codes from
0.80V to 1.075V
-3.0
+3.0
%
DC Output Voltage Accuracy
V
OUT
Includes load-
regulation error
(VPS = FBS)
SUS = V
CC
-25
+25
mV
SUSV Input Range
V
SUSV
0.4
2.0
V
Negative offsets
0
0.8
OFS Input Range
V
OFS
Positive offsets
1.2
2.0
V
∆V
OUT
/
∆V
OFS
;
∆V
OFS
= V
OFS,
V
OFS
= 0 to 0.8V
-0.131
-0.118
OFS GAIN
A
OFS
∆V
OUT
/
∆V
OFS
;
∆V
OFS
= V
OFS
- V
REF,
V
OFS
= 1.2V to 2V
-0.131
-0.118
V/V
GNDS Input Range
V
GNDS
-200
+200
mV
GNDS Gain
A
GNDS
∆V
OUT
/
∆V
GNDS
,
-200mV
≤ V
GNDS
≤ +200mV
0.95
1.05
V/V
OSC = GND
180
220
OSC = REF
270
330
Switching Frequency Accuracy
(Per Phase)
f
SW
OSC = V
CC
540
660
kHz
R
TIME
= 143k
Ω (6.25mV/µs)
-10
+10
R
TIME
= 47k
Ω (19mV/µs) to 392kΩ
(2.28mV/µs)
-15
+15
TIME Slew-Rate Accuracy
Startup and shutdown, R
TIME
= 47k
Ω
(4.75mV/µs) to 392k
Ω (0.57mV/µs)
-20
+20
%
BIAS AND REFERENCE
Quiescent Supply Current (V
CC
)
I
CC
Measured at V
CC
, VPS and FBS forced
above the regulation points
12
mA
Shutdown Supply Current (V
CC
)
I
CC(SHDN)
Measured at V
CC
, SHDN = GND
10
µA
Reference Voltage
V
REF
V
CC
= 4.5V to 5.5V, I
REF
= 0
1.98
2.02
V
I
REF
= 0 to 500µA
-2
mV
Reference Load Regulation
∆V
REF
I
REF
= -100µA to 0
6.2
mV
FAULT PROTECTION
PWM (SKIP = GND)
or SKIP mode when
V
OUT
≤ V
TRIP
150
250
mV
Output Overvoltage-Protection
Threshold
V
OVP
Measured at VPS
with respect to
unloaded output
voltage, rising edge,
8mV hysteresis
SKIP = V
CC
and
V
OUT
> V
TRIP
1.70
1.80
V