ISL85402 Datasheet, PDF (7/18 Pages) Intersil Corporation – 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter

ISL85402
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 ±10%, T_A = -40°C to +85°C. Typical are at T_A = +25°C. Boldface limits apply over
the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNITS
POWER-ON RESET
Rising V_CC POR Threshold
Falling V_CC POR Threshold
V_CC POR Hysteresis
ENABLE
V_{PORH_RISE}
V_{PORL_FALL}
V_{PORL_HYS}
2.82 2.9 3.05 V
2.6 2.8
V
0.3
V
Required Enable On Voltage
Required Enable Off voltage
OSCILLATOR
V_ENH
V_ENL
2
V
0.8
V
PWM Frequency
F_OSC
R_FS = 665kΩ
R_FS = 51.1kΩ
FS Pin Connected to VCC or Floating or GND
160 200 240 kHz
1950 2200 2450 kHz
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
PFM MODE CONTROL
SR
C_LOAD = 50pF
5
V/µs
Default PFM Current Threshold
MODE = VCC or Floating
700
mA
INTERNAL HIGH-SIDE MOSFET
Upper MOSFET r_DS(ON)
LOW-SIDE MOSFET GATE DRIVER
r_{DS(ON)_UP}
125 180 mΩ
LGate Source Resistance
100mA Source Current
3.5
Ω
LGATE Sink Resistance
100mA Sink Current
3.3
Ω
BOOST CONVERTER CONTROL
EXT_BOOST Boost_Off Threshold Voltage
0.74 0.8 0.86 V
EXT_BOOST Hysteresis Sink Current
AUXVCC Boost Turn-Off Threshold Voltage
I_{EXT_BOOST_HYS}
2.4 3.2 3.8 µA
0.74 0.8 0.86 V
AUXVCC Hysteresis Sink Current
I_{AUXVCC_HYS}
2.4 3.2 3.8 µA
7
FN7640.0
September 29, 2011