ISL78227 Datasheet, PDF (11/43 Pages) Intersil Corporation – 2-Phase Boost Controller with Integrated Drivers

ISL78227
Electrical Specifications Refer to Figure 3 on page 7 and Typical Application Schematics (page 8). Operating conditions unless
otherwise noted: V_IN = 12V, V_PVCC = 5.2V and V_VCC = 5.2V, T_A = -40°C to +125°C (Note 7). Typicals are at T_A = +25°C. Boldface limits apply across
the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNIT
Input Minimum Pulse Width - Fall-to-Rise
20
ns
Delay Time from Input Pulse Rising to LG1
Rising Edge Minus Dead Time t_DT1
Input Impedance
C_LG = OPEN, RDT = 50kΩ
Input impedance before synchronization
mode
35
ns
1
kΩ
Input impedance after synchronization mode
200
MΩ
CLKOUT
CLKOUT_H
I_CLKOUT = 500µA
VCC - VCC - 0.1
V
0.5
CLKOUT_L
Output Pulse Width
I_CLKOUT = -500µA
C_CLKOUT = 100pF, t_SW is each phase’s
switching period
0.1
0.4
V
1/12 * t_SW
Phase Shift from LG1 Rising Edge to CLKOUT
Pulse Rising Edge
C_LG1 = OPEN, C_CLKOUT = OPEN,
87
°
f_SW = 300kHz, t_DT1 = 60ns (Please refer to
Figure 56 on page 28 for the timing
diagram)
SOFT-START
Soft-Start Current
I_SS
Minimum Soft-Start Prebias Voltage
4.5
5.0
5.5 µA
0
V
Maximum Soft-Start Prebias Voltage
1.6
V
Soft-Start Prebias Voltage Accuracy
V_FB = 500mV
Soft-Start Clamp Voltage
V_SSCLAMP
HICCUP RETRY DELAY (Please refer to “Selectable Hiccup or Latch-Off Fault Response” on page 33 for details)
-25
3.25
0
3.47
25 mV
3.70 V
Hiccup Retry Delay
If Hiccup fault response selected
500
ms
REFERENCE VOLTAGE FOR OUTPUT VOLTAGE REGULATION
System Reference Accuracy
Measured at the FB pin
1.576 1.600 1.620 V
FB Pin Input Bias Current
V_FB = 1.6V, TRACK = Open
ERROR AMPLIFIER FOR OUTPUT VOLTAGE REGULATION (Gm1)
-0.05
0.01
0.05 µA
Transconductance Gain
2
mA/V
Output Impedance
7.5
MΩ
Unity Gain Bandwidth
Slew Rate
Output Current Capability
C_COMP = 100pF from COMP pin to GND
C_COMP = 100pF from COMP pin to GND
3.3
±3
±300
MHz
V/µs
µA
Maximum Output Voltage
3.5
3.7
V
Minimum Output Voltage
0.1
0.3
V
PWM CORE
SLOPE Pin Voltage
480
500
520 mV
SLOPE Accuracy
Duty Cycle Matching
R_SLOPE = 20k (0.1%)
-20
0
20
%
R_SLOPE = 40.2k (0.1%)
-20
3
20
%
V_RSENx = 30mV, R_SETx = 665Ω (0.1%),
R_SLOPE = 27k, f_SW = 150kHz,
V_COMP = 2.52V, Measure
(T_{on_lg2} - T_{on_lg1})/(T_{on_lg2} + T_{on_lg1}) *2
3
%
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FN8808.2
February 24, 2016