MAX38801
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
General Description
The MAX38801 is a fully integrated, highly efficient
switching regulator for applications operating from 6.5V to
14V input supplies that require up to 15A maximum load.
This single-chip regulator provides compact high-efficiency
power delivery for precision outputs that demand fast
transient response.
The device has different programmability options to enable
a wide range of configurations. The programmable
features include: internal/external reference voltage,
output voltage set-point, switching frequency, overcurrent-
protection level (OCP), and soft-start timing. Discontinuous
current mode (DCM) operation can be enabled using pin-
strapping to improve light-load efficiency.
The MAX38801 includes multiple protection and
measurement features. Positive and negative cycle-by-
cycle OCP, short-circuit protection and overtemperature
protection (OTP) ensure robust design. Input undervoltage
and overvoltage lockout shut down the regulator to
prevent damages when the input voltage is out of
specification. Regulation is halted in case of an output
overvoltage (OVP) event. A status pin indicates that the
output voltage is within range and the output voltage is in
regulation. The device has an analog output that can be
configured to report output current or junction temperature
with ±5% and ±8°C accuracy, respectively.
Benefits and Features
●
High-Efficiency Solution
• Up to 96% Peak
• Up to 92% Full Load
•
Up to 94% Light-Load Efficiency at 1A with DCM
Enabled
●
Flexible Design Allows Early PCB Definition
• Footprint Compatible with MAX38800 (9A) and
MAX38802/MAX38803 (25A)
• Programmable Switching Frequency up to 900kHz
• Programmable Soft-Start and STAT Delay Timings
• Programmable Reference Voltage with External
Input Option
• Programmable Positive and Negative OCP Limit
●
Advanced Architecture, Protection and Reporting
Guarantees Reliable Designs
• Analog Current or Temperature Reporting
• Differential Remote Sense with Open-Circuit
Detection
• Fast Transient Response with Quick-PWM™
Architecture
• Percentage-Based Output Power Good and OVP
• Open-Drain Status Indicator (STAT) Pin
• Input Undervoltage and Overvoltage Lockout
• Adaptive Dead-Time Control
●
Saves Board Space
• Integrated Boost Switch
• 19-Ball WLCSP (2.2mm x 2.8mm) Footprint
• Operation Using Ceramic Input and Output
Capacitors
Applications
●
●
●
●
●
Servers/µServers
I/O and Chipset Supplies
GPU Core Supply
DDR Memory: VDDQ, VPP and VTT
Point-of-Load (PoL) Applications
CURRENT
RATING (A)
15
INPUT
VOLTAGE (V)
6.5 to 14
OUTPUT
VOLTAGE (V)
0.6 to 5.5
Basic Application Circuit
V
CC
C
VCC
V
DDH
C
IN
C
BST
L
OUT
R
R
STAT
SENSE+
SENSE-
GND
Lag Compensation
Ramp Compensation
V
CC
V
DDH
MAX38801
R
STAT
BST
VX
V
OUT
C
R1
R
FB1
C
LEAD
C
R2
Ordering Information
appears at end of data sheet.
R
OE
OE
AGND
PGM
R
LAG
R
LEAD
Lead Compensation
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
C_SEL
R_SEL
C
LAG
R
FB2
C
OUT
19-100158; Rev 0; 9/17
MAX38801
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Absolute Maximum Ratings
Input/Output Pin Voltages
(OE, PGM, SENSE+, SENSE-) ...........................-0.3V to +2V
Regulator Status Output (STAT)..............................-0.3V to +4V
Input Voltage (V
DDH
) DC ......................................-0.3V to +23V
Bias Supply Voltage (V
CC
) ......................................-0.3V to +2V
Switching Node Voltage (VX) DC ..........................-0.3V to +23V
Switching Node Voltage (VX) 25ns (Note 1) ..........-10V to +23V
V
DDH
Pin - VX Pin Differential DC ........................................23V
V
DDH
- VX Differential 25ns (Note 2) .....................-10V to +23V
BST Pin (BST) DC.................................................-0.3V to +20V
BST Pin (BST) 25ns ..............................................-7.0V to +27V
BST Pin - VX Differential .........................................................4V
Junction Temperature (T
J
)................................................. 150°C
Storage Temperature Range ............................ -65°C to +150°C
Peak Reflow Temperature Lead-Free ............................... 260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Input Voltage (V
DDH
)................................................ 6.5V to 14V
Bias Supply Voltage (V
CC
) ................................. 1.71V to 1.89V
Output Current (I
OUT
) ......................................................... 15A
Operating Ratings
Junction Temperature (T
J
) .....................................0°C to 125°C
Peak Output Current (I
PK+_MAX
) ......................................... 30A
Package Information
PACKAGE CODE
Outline Number
Land Pattern Number
THERMAL RESISTANCE, SINGLE-LAYER BOARD
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
32°C/W (typ) (Note 3)
1°C/W (max)
C192B2+1
21-0915
Refer to
Application Note 1891
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that
a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the
drawing pertains to the package regardless of RoHS status.
Note 1:
The 25ns rating is the allowable voltage on the VX node in excess of the -0.3V to 16V DC ratings. The VX voltage can
exceed the DC rating in either the positive or negative direction for up to 25ns per cycle.
Note 2:
The V
DDH
input pin voltage AC should not exceed 19V (25ns). This measurement is taken at the V
DDH
pin referenced
to V
SS
pin immediately adjacent using a high frequency scope probe with I
LOAD
at I
MAX
. A high-frequency input bypass
capacitor must be located less than 60mils from the V
DDH
pin and the Maxim device per our design guidelines.
Note 3:
Data taken using Maxim’s evaluation kit with no air flow and no heatsink.
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MAX38801
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Electrical Characteristics
(V
CC
= 1.8V ±5%, unless otherwise specified.)
PARAMETER
12V Supply Voltage Range
1.8V Supply Voltage Range
V
CC
Supply Current
V
REF
Programmable Reference
Voltage
V
REF
Tolerance (V
REF_TOL
)
V
REF
Tolerance Temperature
Coefficient (V
REFT_COEFF
)
FEEDBACK LOOP
R
SENSE
GAIN
SWITCHING FREQUENCY
Relative to the nominal value
(see Figure 7).
0A < I
LOAD
< full load V
CC
,
V
DDH
±10% (Note 7)
DCM enabled
DCM enabled. The low f
SW
threshold has been crossed.
5.8
5.2
14.2
13.8
1.46
1.43
1.49
1.41
Gain
See Table 3 (Note 8)
1.05
2.1
mV/A
V
REF
See Table 3 (Note 8)
T = 35°C (Note 4)
0°C < TJ < 100°C (Note 4)
-0.5
0.6
0.95
+0.5
0.0106
V
%
%/°C
SYMBOL
V
DDH
V
CC
I
CC
Note 7
Note 7
CCM (Note 7)
DCM (Note 7)
Shutdown (Note 7)
32
CONDITIONS
MIN
6.5
1.71
1.8
TYP
MAX
14
1.89
35
25
132
UNITS
V
V
mA
µA
SUPPLY VOLTAGES, SUPPLY CURRENT, TEMPERATURE RANGE
Switching Frequency Accuracy
f
SW
-25
25
%
Low f
SW
Threshold
Forced Minimum f
SW
INPUT PROTECTION
Rising V
DDH
UVLO Threshold
Falling V
DDH
UVLO Threshold
Hysteresis
Rising V
DDH
OVLO Threshold
Falling V
DDH
OVLO Threshold
Hysteresis
Rising V
CC
UVLO Threshold
Falling V
CC
UVLO Threshold
Hysteresis
Rising UVLO Threshold
Falling UVLO Threshold
Hysteresis
30
60
kHz
kHz
V
DDH
UVLO
V
DDH
OVLO
Note 7
6.2
5.5
700
14.8
14.3
500
1.62
1.57
50
1.57
1.52
50
6.5
5.9
15.4
14.8
1.70
1.68
1.70
1.63
V
V
mV
V
V
mV
V
V
mV
V
V
mV
Note 7
V
CC
UVLO
Note 7
V
BST
UVLO
Note 7
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Maxim Integrated
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MAX38801
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Electrical Characteristics (continued)
(V
CC
= 1.8V ±5%, unless otherwise specified.)
PARAMETER
Overvoltage-Protection Rising
Threshold
OVP Deglitch Filter Time
Power Good Protection Falling
Threshold
Power Good Protection Rising
Threshold
Power Good Deglitch Filter
Time
OVERCURRENT PROTECTION (OCP)
12
Positive OCP Threshold
OCP
Absolute value of inductor (Note 8)
15
18
-12
Valley current (Note 8)
Referenced to nominal value (Note 7)
Referenced to inception value (Note 7)
Note 7
-20
12
130
-25
0
T
J
Note 7
-8
15
140
-15
-18
OCP Threshold Tolerance
Hysteresis (Note 5)
OVERTEMPERATURE PROTECTION (OTP)
OTP Inception Threshold
Hysteresis
TEMPERATURE REPORTING
Temperature Reporting Range
Temperature Reporting
Tolerance
CURRENT REPORTING
Current Reporting Range
Current Reporting Tolerance
OE PIN
Input Range
Rising Threshold
Falling Threshold
Hysteresis
Deglitch Filter Time
OE Pin Input Resistance
UVLO < V
CC
< OVLO (Note 7)
V
OE(H)
V
OE(L)
(Note 7)
Full V
CC
supply range. Measured at
OE Pin (Note 7)
(Note 7)
0
0.98
0.44
0.36
230
300
430
1.09
0.66
0.44
1.89
1.3
0.80
0.61
520
480
V
V
V
V
ns
kΩ
I
LOAD
From no load to full load (Note 7)
Full load (Note 7)
0
-1.5
-5
15
+1.5
+5
A
A
%
150
+8
°C
°C
OTP
150
-10
°C
°C
+20
18
%
%
A
A
PWRGD
Relative to programmed V
OUT
(Note 7)
Note 7
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUTPUT VOLTAGE PROTECTION (OVP)
OVP
Relative to programmed V
OUT
(Note 7)
8.5
25
5
3
25
13
30
9
6
30
16
36
12
9
36
%
µs
%
%
µs
Negative OCP Threshold
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Maxim Integrated
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MAX38801
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Electrical Characteristics (continued)
(V
CC
= 1.8V ±5%, unless otherwise specified.)
PARAMETER
STARTUP TIMING
Enable Time from OE Rise to
Start of Regulation
Soft-Start Ramp Time
Dwell Time at V
OUT
(DCM Not Allowed)
Timing to Charge Boost
Capacitor
STAT PIN
Pullup Voltage
VOH
STAT
I
STAT
= 4mA (Note 7)
I
STAT
= 0.2mA,
0V < V
CC
< UVLO and
0V < V
DDH
< UVLO (Note 7)
I
STAT
= 1.3mA,
0V < V
CC
< UVLO and
0V < V
DDH
< UVLO (Note 7)
Current Sinking Capability
Status Output High Leakage
Current
Time from V
OUT
Ramp
Completion to STAT Pin
Released
Fault Clearing
PGM PIN
Reporting Voltage Range
Resistor Range
Resistor Accuracy
Capacitor Range
C_SEL Capacitor Accuracy
C_SEL
External Capacitance
Load and stray capacitance in
addition to C_SEL
V
PGM
R_SEL
System regulating
Twelve options
EIA standard resistor values only
Three options
0.5
1.78
-1
0
-20
1
162
+1
820
+20
20
V
kΩ
%
pF
%
pF
I
STAT
V
STAT
= 0.4V (Note 7)
STAT pulled to 3.3V through 20kΩ
(Note 7)
STAT output low to high.
See Table 3. (Note 8)
Bad-to-good delay
1.8
128
2000
2
2.2
3
11
7
3.6
0.4
0.67
V
0.76
mA
µA
V
t
EN
200
300
1.5
t
SS
See Table 3 (Note 8)
3
6
t
SETTLE
t
BST
14
8
35
µs
µs
ms
500
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Status Output Low
VOL
STAT
t
STAT
µs
ms
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