User Manual

MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= V
SHDN
= V
TON
= V
SKIP
= V
S0
= V
S1
= V
CODE
= 5V, V
FB
= V
CMP
= V
CMN
= V
CSP
= V
CSN
= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; T
A
= -40°C to +100°C, unless otherwise specified.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
BIAS AND REFERENCE
Quiescent Supply Current (V
CC
)I
CC
Measured at V
CC
, FB forced above the
regulation point, OAIN- = FB,
V
OAIN+
= 1.3V
3.2 mA
Quiescent Supply Current (V
DD
)I
DD
Measured at V
DD
, FB forced above the
regulation point
20 µA
Quiescent Battery Supply Current
(V+)
I
V+
Measured at V+ 50 µA
Shutdown Supply Current (V
CC
) Measured at V
CC
, SHDN = GND 20 µA
Shutdown Supply Current (V
DD
) Measured at V
DD
, SHDN = GND 20 µA
Shutdown Battery Supply Current
(V+)
Measured at V+, SHDN = GND,
V
CC
= V
DD
= 0 or 5V
20 µA
Reference Voltage V
REF
V
CC
= 4.5V to 5.5V, I
REF
= 0 1.985 2.015 V
FAULT PROTECTION
Output Overvoltage Protection
Threshold (MAX1545 Only)
V
OVP
SKIP = V
CC
, measured at FB with respect
to unloaded output voltage
13 19 %
Output Undervoltage Protection
Threshold
V
UVP
Measured at FB with respect to unloaded
output voltage
67 73 %
Lower threshold
(undervoltage)
-13 -7
VROK Threshold
Measured at FB
with respect to
unloaded output
voltage
Upper threshold
(overvoltage)
SKIP = V
CC
+7 +13
%
VROK Startup Delay
Measured from the time when FB first
reaches the voltage set by the DAC code
after startup
3ms
V
CC
Undervoltage Lockout
Threshold
V
UVLO
(
VCC
)
Rising edge, hysteresis = 90mV, PWM
disabled below this level
3.90 4.45 V
CURRENT LIMIT AND BALANCE
Current-Limit Threshold Voltage
(Positive, Default)
V
LIMIT
CMP - CMN, CSP - CSN; ILIM = V
CC
27 33 mV
V
ILIM
= 0.2V 7 13
Current-Limit Threshold Voltage
(Positive, Adjustable)
V
LIMIT
CMP - CMN,
CSP - CSN
V
ILIM
= 1.5V 72 78
mV
Current-Limit Threshold Voltage
(Negative)
V
LIMIT
(
NEG
)
CMP - CMN, CSP - CSN; ILIM = V
CC
,
SKIP = V
CC
-30 -42 mV
Current-Balance Offset V
OS
(
IBAL
)
(V
CMP
- V
CMN
) - (V
CSP
- V
CSN
); I
CCI
= 0,
-20mV < (V
CMP
- V
CMN
) < 20mV,
1.0V < V
CCI
< 2.0V
-3 +3 mV