Datasheet

(V
IN
= +12V, V
ON/OFF
= +12V, V
SYNC
= 0V, I
OUT
= 0, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C. See the Typical Operating Circuit.) (Note 1)
Note 1: All limits at -40°C are guaranteed by design, not production tested.
Note 2: For total current consumption during switching (at no load), also see the Typical Operating Characteristics.
Note 3: Switch current at which the current-limit circuit is activated.
Note 4: Limits are guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INTERNAL SWITCH/CURRENT LIMIT
Peak Switch Current Limit I
LIM
(Note 3) 2.4 3.3 5.0 A
Switch Leakage Current I
OL
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V -10 +10 µA
Switch On-Resistance R
DS(ON)
I
SWITCH
= 1A 0.26 0.4 Ω
PFM Threshold I
PFM
Minimum switch current in any cycle 1 60 300 mA
PFM Threshold I
PFM
Minimum switch current in any cycle at
T
J
≤ +25°C (Note 4)
14 300 mA
FB Input Bias Current I
B
MAX5090C, V
FB
= 1.2V -150 +0.1 +150 nA
ON/OFF CONTROL INPUT
ON/OFF Input-Voltage
Threshold
V
ON/OFF
Rising trip point 1.180 1.38 1.546 V
ON/OFF Input-Voltage
Hysteresis
V
HYST
100 mV
ON/OFF Input Current I
ON/OFF
V
ON/OFF
= 0V to V
IN
10 100 nA
OSCILLATOR/SYNCHRONIZATION
Oscillator Frequency f
0SC
106 127 150 kHz
Synchronization f
SYNC
119 200 kHz
Maximum Duty Cycle D
MAX
V
IN
= 6.5V to 76V, V
OUT
≤ 11V 80 95 %
SYNC High-Level Voltage 2.0 V
SYNC Low-Level Voltage 0.8 V
SYNC Minimum Pulse Width 350 ns
SYNC Input Leakage -1 +1 µA
INTERNAL VOLTAGE REGULATOR
Regulator Output Voltage V
D
V
IN
= 9V to 76V, I
OUT
= 0 7.0 7.8 8.4 V
Dropout Voltage 6.5V ≤ V
IN
≤ 8.5V, I
OUT
= 15mA 0.5 V
Load Regulation ∆VD/∆I
VD
0 to 15mA 10 Ω
PACKAGE THERMAL CHARACTERISTICS
Thermal Resistance
(Junction to Ambient)
θ
JA
TQFN package (JEDEC 51) 30 °C/W
THERMAL SHUTDOWN
Thermal-Shutdown Junction
Temperature
T
SH
Temperature rising +175 °C
Thermal-Shutdown
Hysteresis
T
HYST
20 °C
MAX5090A/B/C 2A, 76V, High-Efciency MAXPower
Step-Down DC-DC Converters
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics (continued)