ISL78205 Datasheet, PDF (7/16 Pages) Intersil Corporation – 2.5A Buck Controller with Integrated High-Side MOSFET

ISL78205
Electrical Specifications Refer to “Block Diagram” on page 4 and Typical Application Schematics on page 5. Operating
Conditions Unless Otherwise Noted: V_IN = 12V, or V_CC = 4.5V, T_A = -40°C to +105°C. Typicals are at T_A = +25°C. Boldface limits apply over the
operating temperature range, -40°C to +105°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 7) TYP (Note 7) UNITS
OSCILLATOR
PWM Frequency
f_OSC
R_T = 665kΩ
160 200 240 kHz
R_T = 51.1kΩ
1950 2200 2450 kHz
FS Pin connected to VCC or Floating or GND 450 500 550 kHz
MIN ON Time
MIN OFF Time
REFERENCE VOLTAGE
t_{MIN_ON}
t_{MIN_OFF}
130 225 ns
210 325 ns
Reference Voltage
System Accuracy
V_REF
0.8
V
-1.0
1.0 %
FB Pin Source Current
5
nA
SOFT-START
Soft-Start Current
I_SS
ERROR AMPLIFIER
3
5
7
µA
Unity Gain-Bandwidth
DC Gain
Maximum Output Voltage
C_LOAD = 50pF
C_LOAD = 50pF
10
MHz
88
dB
3.6
V
Minimum Output Voltage
0.5
V
Slew Rate
INTERNAL HIGH-SIDE MOSFET
SR
C_LOAD = 50pF
5
V/µs
Upper MOSFET r_DS(ON)
LOW-SIDE MOSFET GATE DRIVER
r_{DS(ON)_UP} Note 6
90 150 mΩ
LGate Source Resistance
100mA Source Current
3.5
Ω
LGATE Sink Resistance
100mA Sink Current
3.3
Ω
POWER GOOD MONITOR
Overvoltage Rising Trip Point
Overvoltage Rising Hysteresis
Undervoltage Falling Trip Point
Undervoltage Falling Hysteresis
PGOOD Rising Delay
PGOOD Leakage Current
PGOOD Low Voltage
OVERCURRENT PROTECTION
V_FB/V_REF Percentage of Reference Point
V_FB/V_OVTRIP Percentage Below OV Trip Point
V_FB/V_REF Percentage of Reference Point
V_FB/V_UVTRIP Percentage Above UV Trip Point
t_{PGOOD_DELAY} f_OSC = 500kHz
PGOOD HIGH, V_PGOOD = 4.5V
V_PGOOD
PGOOD LOW, I_PGOOD = 0.2mA
104 110 116 %
3
%
84 90 96
%
3
%
2
ms
10
nA
0.10
V
Default Cycle by Cycle Current Limit Threshold
Hiccup Current Limit Threshold
OVERVOLTAGE PROTECTION
I_{OC_1}
I_{OC_2}
ILIMIT = GND or VCC or Floating
Hiccup, I_{OC_2}/I_{OC_1}
3
3.6 4.2
A
115
%
OV Latching-off Trip Point
Percentage of Reference Point
LG = UG = LATCH LOW
120
%
7
FN7926.0
September 22, 2011