Rainbow Electronics MAX15026 - Manual (Page 3)

MAX15026
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ENABLE (EN)
EN Input High V
EN_H
V
EN
rising 1.14 1.20 1.26 V
EN Input Low V EN_L V EN falling 0.997 1.05 1.103 V
EN Input Leakage Current I LEAK_EN V EN = 5.5V -1 +1 µA
OSCILLATOR
Switching Frequency f SW R RT = 27k Ω 540 600 660 kHz
1MHz Switching Frequency R RT = 15.7k Ω 0.9 1 1.1 MHz
2MHz Switching Frequency R RT = 7.2k Ω 1.8 2.0 2.4 MHz
Switching Frequency Adjustment
Range (Note 3)
200 2000 kHz
RT Voltage V RT 1.19 1.205 1.22 V
PWM Ramp Peak-to-Peak V DRV_UVLO V DRV rising 4.0 4.2 4.4 V
DRV Undervoltage Lockout
Hysteresis
400 mV
Low, sinking 100mA, V BST = 5V 1 3
DH On-Resistance
High, sourcing 100mA, V BST = 5V 1.5 4.5
Ω
Low, sinking 100mA, V DRV = 5.2V 1 3
DL On-Resistance
High, sourcing 100mA, V DRV = 5.2V 1.5 4.5
Ω
Sinking 1.8
DH Peak Current C
LOAD
= 10nF
Sourcing 2
A
Sinking 3
DL Peak Current C LOAD = 10nF
Sourcing 2.4
A
DH/DL Break-Before-Make Time
Time from high side at 1V to low side at
1V
10 ns
SOFT-START
Soft-Start Duration 2048
Switching
Cycles
Reference Voltage Steps 64 Steps
CURRENT LIMIT/HICCUP
Current-Limit Threshold
Adjustment Range
Cycle-by-cycle valley current-
limit threshold adjustment range
valley limit = V
LIM /10
30 300 mV
ELECTRICAL CHARACTERISTICS (continued)
(V IN = 12V, R RT = 27k
Ω, R
LIM = 30k
Ω, C
VCC = 4.7µF, C IN = 1µF, T A = -40°C to +85°C, unless otherwise noted. Typical values are at
T A = +25°C.) (Note 2)