ISL78225 Datasheet, PDF (8/21 Pages) Intersil Corporation – 4-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement

ISL78225
Electrical Specifications Operating Conditions: V_IN = 12V, T_A = -40°C to +125°C, unless otherwise specified. Typical specifications are
at T_A = +25°C. Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNITS
V_REF2 External Reference Voltage Range
0.7
V_REF2 External Reference Voltage Accuracy -40°C to +125°C, measure at FB pin, V_REF2 = 1.8V
-1
-40°C to +125°C, measure at FB pin, V_REF2 = 0.7V
-1.5
ERROR AMPLIFIER
1.8
V
1
%
1.5
Transconductance Gain
2
mS
Output Impedance
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
11
2.5
±300
MHz
V/µs
µA
Maximum Output Voltage
3.5
V
Minimum Output Voltage
0.5
V
PWM CORE
Duty Cycle Matching
Zero Crossing Detection (ZCD) Threshold for
PWM1/PWM2
I_ISENxP = 60µA, R_SLOPE = 30.1k, f_S = 250kHz,
V_COMP = 2V, 4-phase, T_A = +25°C
R_{SEN1, 2} = 750Ω
-6
6
%
3
mV
Leading Edge Blanking (Audio Mode)
V_MODE = VCC, V_{PWM_TRI} = VCC, V_COMP = 0.5V
Ts/12
ns
(Note 8)
Leading Edge Blanking (Other Mode)
SLOPE pin Voltage
V_MODE <4V or V_{PWM_TRI} = GND, V_COMP = 0.5V
130
ns
385
515
650
mV
ISENxN Bias Current
ISENxN, ISENxP Common Mode Voltage
Range
V_ISENxN = V_ISENxP, from V_IN - 1V to V_IN
V_IN > 12V
0.3
µA
V_IN-5
V_IN
V
PWMx OUTPUT
PWMx Output Voltage LOW
PWMx Output Voltage HIGH
PWMx Tri-State Output Voltage
PWMx Pull-Down Current
PWM3, PWM4 Disable Threshold
PHASE ADDING/DROPPING
I_PWMx = -500µA
0.5
V
I_PWMx = +500µA
4.5
V
I_PWMx = ±100µA
2.3
2.5
2.7
V
During Phase Detection Time (t₃ on Figure 14), V_PWM = 1V
50
µA
During Phase Detection Time (t₃ on Figure 14)
3.5
V
MODE Pull-up Current
V_IOUT Threshold, 4-phase, Drop Phase 4
V_IOUT Threshold, 4-phase, Drop Phase 3
V_IOUT Threshold, 3-phase, Drop Phase 3
V_IOUT Threshold Hysteresis
Phase Drop Disable Threshold at MODE pin
V_MODE = 2.4V
V_MODE = 1.6V
V_MODE = 1.6V
V_MODE = 1.8V
4.2
5.1
5.6
µA
1.175 1.2 1.225
V
0.775 0.8 0.825
V
1.175 1.2 1.225
V
40
mV
3.5
4
V
CURRENT SENSE AND OVERCURRENT PROTECTION
Peak Current Limit for Individual Channel
160
µA
IOUT Current Tolerance
Maximum Voltage Limit at IOUT Pin
I_ISENxP = 60µA, 4-phase
173
187 200
µA
2.0
V
DMAX PIN
DMAX Threshold, High
3
V
DMAX Threshold, Low
2
V
DMAX Floating Voltage
During Phase Detection Time (t₃ on Figure 14)
2.5
V
8
FN7909.0
December 15, 2011