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MAX38889 Datasheet(PDF) 4 Page - Maxim Integrated Products

Part # MAX38889
Description  2.5V to 5.5V, 3A Reversible Buck/Boost Regulator for Backup Applications
PDF  17 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX38889 Datasheet(HTML) 4 Page - Maxim Integrated Products

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MAX38889
2.5V to 5.5V, 3A Reversible Buck/Boost
Regulator for Backup Applications
www.maximintegrated.com
Maxim Integrated | 4
(VSYS = 3.7V, VCAP = 2.8V, TJ = -40C to +125C (typical values at TJ = +25C), circuit of Figure 1, unless otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LX Peak Backup
Current Limit
ILX_BU
Circuit of Figure 1,
VCAP = 2V, VSYS =
2.5V (Note 1)
RISET = 33kΩ
2.25
3
3.75
A
ILX_BU
Circuit of Figure 1,
VCAP = 2V, VSYS =
2.5V (Note 1)
RISET = 100kΩ
1
LX Peak Charge
Current Limit (Note 1)
ILX_CHG
Circuit of Figure 1,
VSYS = 3.7V,
VCAP = 2V
RISET = 33kΩ
2.25
3
3.75
A
RISET = 100kΩ
1
Feedback Input Bias
Current
IFBS, IFBCH,
IFBCR
VFBS = 1.2V,
VFBCH = VFBCR =
0.5V
TA = +25°C
-0.1
0.01
+0.1
µA
TA = +125°C
0.01
Enable Input Leakage
Current
IENC, IENB
0V < VENC,
VENB < 5.5V
TA = +25°C
-1
0.004
1
µA
TA = +125°C
0.01
LX Low-Side FET
Resistance
RLOW
VLX switched to 0V
42
84
mΩ
LX High-Side FET
Resistance
RHIGH
VLX switched to VSYS
57
114
mΩ
LX Leakage Current
ILX_LKG
VENC = VENB =
0V, VSYS = 5.5V,
VLX = 0 to 5.5V
TA = +25°C
-1
0.01
1
µA
TA = +125°C
0.26
Maximum On-Time
tON
Typical
Application Circuit,
VSYS = 2.9V
VCAP = 2V
320
400
480
ns
VCAP = 1.2V
570
Minimum Off-Time
tOFF
Backup mode, VFBS = 1.164V
80
100
120
ns
Maximum Duty Cycle
DutyMAX
VCAP = 0.5V
90
95
%
Overtemperature
Lockout Threshold
TOTLO
TJ rising, 15°C typical hysteresis
165
°C
Logic Output Leakage
High
IBKB_H
VBKB = 5.5V,
VRDY = 5.5V
TA = +25°C
-1
0.001
+1
µA
IRDY_H
VBKB = 5.5V,
VRDY = 5.5V
TA = +125°C
0.01
Logic Output Voltage
Low
VBKB_L
VRDY_L
IBKB = 10mA, IRDY = 10mA
0.1
0.4
V
High-Side FET
Zero-Crossing
IZXP
Circuit of Figure 1, VSYS = 2.9V,
VCAP = 2V (Note 1)
60
mA
Low-Side FET
Zero-Crossing
IZXN
Circuit of Figure 1, VSYS = 3.7V,
VCAP = 2V (Note 1)
180
mA
Note 1:
DC measurement, actual inductor current accuracy in the circuit is affected by the propagation delay
time.



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