MIC24046-H Datasheet, PDF (5/24 Pages) Micrel Semiconductor – Pin-Programmable, 4.5V − 19V, 5A Step-Down Converter

Micrel, Inc.
MIC24046-H
Electrical Characteristics⁽⁵⁾ (Continued)
VVIN = VVINLDO = 12V; CVDDA= 2.2µF, CVDDP = 2.2µF, TA = 25°C, unless otherwise noted. Bold values indicate −40°C ≤ TJ ≤ +125°C.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max. Units
EN/DLY Control
EN_LDO_R LDO Enable Threshold
Turns On VDDA LDO
507
580
mV
EN_LDO_F LDO Disable Threshold
Turns Off VDDA LDO
460
491
mV
EN_LDO_H LDO Threshold Hysteresis
16
mV
EN_R
EN/DLY Rising Threshold
Initiates power-stage operation
1.14
1.21
1.28
V
EN_F
EN/DLY Falling Threshold
Stops power-stage operation
1.06
V
EN_H
EN/DLY Hysteresis
150
mV
EN_I
EN/DLY Pull-Up Current
Switching Frequency
TA = TJ = 25°C
1
2
3
µA
fSZ
Programmable Frequency
(High Z)
FREQ = High Z (open)
360
400
440
kHz
fS0
Programmable Frequency 0
fS1
Programmable Frequency 1
Overcurrent Protection
FREQ = Low (GND)
FREQ = High (VDDA)
500
565
630
kHz
700
790
880
kHz
ILIM_HS0
ILIM_HS1
ILIM_HSZ
HS Current Limit 0
HS Current Limit 1
HS Current Limit High Z
ILIM = Low (GND)
ILIM = High (VDDA)
ILIM = High Z (open)
6.0
7.1
8.1
A
8.1
9.3
10.3
A
9.3
10.5
11.9
A
LEB
Top FET Current-Limit
Leading Edge-Blanking Time
108
ns
ILIM_LS0
ILIM_LS1
ILIM_LSZ
LS Current Limit 0
LS Current Limit 1
LS Current Limit Hi Z
ILIM = Low (GND)
ILIM = High (VDDA)
ILIM = High Z (Open)
3.0
4.6
6.3
A
4.0
6.2
7.9
A
5.0
6.8
8.6
A
INHICC_DE
OC Events Count for Hiccup
Number of subsequent cycles in
current limit before entering hiccup
overload protection.
15
Clock
Cycles
tHICC_WAIT
Hiccup Wait Time
Duration of the High-Z state on LX
before new soft-start.
3x
Soft-Start
Time
Power Switches
RBOTTOM
Bottom FET ON resistance
VVIN = VVINLDO = VVDDP = VVDDA = 5V,
VBST-VLX = 5V, TA = TJ = 25°C
16
21
mΩ
RTOP
Top FET ON resistance
Pulse-Width Modulation (PWM)
VVIN = VVINLDO = VVDDP = VVDDA = 5V,
VBST-VLX = 5V, TA = TJ = 25°C
38
50
mΩ
TON(MIN)
Minimum LX ON Time
TA = TJ = 25°C
26
ns
TOFF(MIN)
DMIN
Minimum LX OFF time
Minimum Duty Cycle
VVIN = VVINLDO = VVDDA = 5V, VOUTSNS =
3V, FREQ = Open (400kHz setting),
VVOSET0 = VVOSET1 = 0V (3.3V
90
setting),TA = TJ = 25°C
VOUTSNS >1.1 × VOUT(NOM)
135
190
ns
0
%
July 7, 2015
5
Revision 1.1