MAX1544 Datasheet, PDF (3/42 Pages) Maxim Integrated Products – Dual-Phase, Quick-PWM Controller for AMD Hammer CPU Core Power Supplies

Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V_CC = V_DD = V_SHDN = V_TON = V_SKIP = V_S0 = V_S1 = V_OVP = 5V, V_FB = V_CMP = V_CMN = V_CSP = V_CSN =
1.3V, OFS = SUS = GNDS = D0–D4 = GND; T_A = 0°C to +85°C, unless otherwise specified. Typical values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
TON = GND
(550kHz)
155
180
205
On-Time (Note 3)
t_ON
V+ = 12V,
V_FB = V_CCI = 1.2V
TON = REF
(300kHz)
TON = open
(200kHz)
320
355
390
ns
475
525
575
TON = V_CC
(100kHz)
920 1000 1140
Minimum Off-Time (Note 3)
BIAS AND REFERENCE
TON = GND
t_OFF(MIN)
TON = V_CC, open, or REF
300 375
ns
400 480
Quiescent Supply Current (V_CC)
Quiescent Supply Current (V_DD)
I_CC
Measured at V_CC, FB forced above the
regulation point, OAIN- = FB, V_OAIN+ = 1.3V
I_DD
Measured at V_DD, FB forced above the
regulation point
1.70 3.20
mA
<1
5
µA
Quiescent Battery Supply Current
(V+)
I_V+
Measured at V+
25
40
µA
Shutdown Supply Current (V_CC)
Shutdown Supply Current (V_DD)
Measured at V_CC, SHDN = GND
Measured at V_DD, SHDN = GND
4
10
µA
<1
5
µA
Shutdown Battery Supply Current
(V+)
Measured at V+, SHDN = GND,
V_CC = V_DD = 0 or 5V
<1
5
µA
Reference Voltage
V_REF
V_CC = 4.5V to 5.5V, I_REF = 0
1.990 2.000 2.010
V
Reference Load Regulation
FAULT PROTECTION
∆V_REF I_REF = -10µA to 100µA
-10
+10
mV
Output Overvoltage Protection
Threshold
SKIP = V_CC, measured at FB with respect
13
16
19
%
V_OVP to unloaded output voltage
SKIP = REF or GND
2.00
V
Output Overvoltage Propagation
Delay
t_OVP
FB forced 2% above trip threshold
10
µs
Output Undervoltage Protection
Threshold
V_UVP
Measured at FB with respect to unloaded
output voltage
67
70
73
%
Output Undervoltage Propagation
Delay
t_UVP
FB forced 2% below trip threshold
10
µs
VROK Threshold
Measured at FB
with respect to
unloaded output
voltage
Lower threshold
(undervoltage)
Upper threshold
(overvoltage)
SKIP = V_CC
-12
-10
-8
%
+8
+10 +12
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