ISL78227 Datasheet, PDF (10/43 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
POWER-ON RESET (For both PVCC and VCC)
Rising V_VCC POR Threshold
Falling V_VCC POR Threshold
V_VCC POR Hysteresis
Rising V_PVCC POR Threshold
Falling V_PVCC POR Threshold
V_PVCC POR Hysteresis
Soft-Start Delay
EN
V_{PORH_VCC}
V_{PORL_VCC}
V_{PORHYS_VCC}
V_{PORH_PVCC}
V_{PORL_PVCC}
V_{PORHYS_PVCC}
t_{SS_DLY}
From POR rising to initiation of soft-start.
R_FSYNC = 61.9k, f_SW = 200kHz, PLLCOMP
pin network of R_PLL = 3.24k, C_PLL1 = 6.8nF
and C_PLL2 = 1nF
4.35
4.05
4.35
3.0
4.50
4.15
0.4
4.50
3.2
1.3
0.85
4.75 V
4.25 V
V
4.75 V
3.4
V
V
ms
Enable Threshold
Input Impedance
V_ENH
V_ENL
V_{EN_HYS}
EN Rising
EN Falling
Hysteresis
EN = 4V
1.13
0.85
2
1.21
0.95
250
6
1.33 V
1.10 V
mV
MΩ
PWM SWITCHING FREQUENCY
PWM Switching Frequency (per phase)
Minimum Adjustable Switching Frequency
F_OSC
R_FSYNC = 249kΩ (0.1%)
R_FSYNC = 82.5kΩ (0.1%)
R_FSYNC = 40.2kΩ (0.1%)
R_FSYNC = 10kΩ (0.1%)
46.0
142
290
990
50.2
150
300
1100
50
54.5 kHz
156 kHz
310 kHz
1170 kHz
kHz
Maximum Adjustable Switching Frequency
1100
kHz
FSYNC Pin Voltage
0.5
V
Minimum ON-Time (Blanking Time) on LGx
Maximum Duty Cycle
SYNCHRONIZATION (FSYNC PIN)
t_{MINON_1}
t_{MINON_2}
t_{MINON_3}
t_{MINON_4}
D_MAX
Minimum duty cycle, C_UG = C_LG = OPEN
R_BLANK = 80kΩ (0.1%)
Minimum duty cycle, C_UG = C_LG = OPEN
R_BLANK = 50kΩ (0.1%)
Minimum duty cycle, C_UG = C_LG = OPEN
R_BLANK = 25kΩ (0.1%)
Minimum duty cycle, C_UG = C_LG = OPEN
R_BLANK = 10k
D_MAX = T_LG_ ON/t_SW, V_COMP = 3.5V,
f_SW = 300kHz, RDT = 18.2kΩ, C_UG = OPEN,
C_LG = OPEN
315
175
100
75
88.5
410
260
140
90
89.0
525 ns
325 ns
180 ns
105 ns
90.5 %
Minimum Synchronization Frequency at FSYNC
Input
50
kHz
Maximum Synchronization Frequency at
FSYNC Input
1100
kHz
Input High Threshold
VIH
3.5
V
Input Low Threshold
VIL
1.5
V
Input Minimum Pulse Width - Rise-to-Fall
20
ns
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FN8808.2
February 24, 2016