Rainbow Electronics MAX8760 - Manual (Page 5)

MAX8760
Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
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ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V CC = V DD = V SHDN = V SKIP = V S0 = V S1 = 5V, V FB = V CMP = V CMN = V CSP = V CSN = 1.3V, OFS =
SUS = GNDS = D0–D5 = 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
Current-Balance
Transconductance
G m(IBAL) 400 µS
GATE DRIVERS
DH_ Gate-Driver On-Resistance R ON(DH) BST_ - LX_ forced to 5V 1.0 4.5 Ω
High state (pullup) 1.0 4.5
DL_ Gate-Driver On-Resistance R ON(DL)
Low start (pulldown) 0.4 2
Ω
DH_ Gate-Driver Source/Sink
Current
I DH
DH_ forced to 2.5V,
BST_ - LX_ forced to 5V
1.6 A
DL_ Gate-Driver Sink Current I DL(SINK) DL_ forced to 5V 4 A
DL_ Gate-Driver Source Current I DL(SOURCE) DL_ forced to 2.5V 1.6 A
DL_ rising 35
Dead Time t DEAD
DH_ rising 26
ns
VOLTAGE-POSITIONING AMPLIFIER
Input Offset Voltage V OS -1 +1 mV
Input Bias Current I BIAS OAIN+, OAIN- 0.1 200 nA
Op Amp Disable Threshold V OAIN- 3 V CC - 1
V CC -
0.4
V
Common-Mode Input Voltage
Range
V CM Guaranteed by CMRR test 0 2.5 V
Common-Mode Rejection Ratio CMRR V OAIN+ = V OAIN- = 0 to 2.5V 70 115 dB
Power-Supply Rejection Ratio PSRR V CC = 4.5V to 5.5V 75 100 dB
Large-Signal Voltage Gain A OA R L = 1k Ω to V
CC /2 80 112 dB
V CC - V FBH 77 300
Output Voltage Swing
|V OAIN+ - V OAIN- | ≥ 10mV,
R L = 1k Ω to V
CC /2 V FBL 47 200
mV
Input Capacitance 11 pF
Gain-Bandwidth Product 3 MHz
Slew Rate 0.3 V/µs
Capacitive-Load Stability No sustained oscillations 400 pF
LOGIC AND I/O
SHDN Input High Voltage V IH 0.8 V
SHDN Input Low Voltage V IL 0.4 V
SHDN No-Fault Threshold V SHDN To enable no-fault mode 12 15 V
High 2.7
REF 1.2 2.3 Three-Level Input Logic Levels SUS, SKIP
Low 0.8
V
Logic Input Current SHDN, SKIP, SUS -1 +1 µA
D0–D5 Logic Input High Voltage 1.6 V