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MAX38800
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
General Description
The MAX38800 is a fully integrated, highly efficient
switching regulator for applications operating from 6.5V to
14V input supplies that require up to 9A 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 MAX38800 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.
The device is available in a 19-bump (2.2mm x 2.8mm)
WLCSP package that provides low thermal resistance
and minimizes the printed circuit board area.
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)
9
INPUT
VOLTAGE (V)
6.5 to 14
OUTPUT
VOLTAGE (V)
0.6 to 5.5
Ordering Information appears at end of data sheet.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Benefits and Features
● High-Efficiency Solution
• Up to 96% Peak
• Up to 95.5% Full Load
Up to 94% Light-Load Efficiency at 1A with DCM
Enabled
● Flexible Design Allows Early PCB Definition
• Footprint Compatible with MAX38801 (15A) and
MAX38802/MAX38803 (25A)
• Programmable Switching Frequency up to 1MHz
• Programmable Soft-Start and STAT Delay Timings
• Programmable Reference Voltage with External
Input Option
• Programmable Positive and Negative OCP Limit
• Supports Current Sourcing and Sinking
● 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-Bump WLCSP (2.2mm x 2.8mm) Footprint
• Operation Using Ceramic Input and Output
Capacitors
Basic Application Circuit
VCC
CVCC
RSTAT
VCC VDDH
MAX38800
BST
VDDH
CIN
CBST
VX
STAT
ROE
OE
SENSE+
SENSE-
AGND
PGM
GND
RLAG
C_SEL
R_SEL
CLAG
LOUT
RR Ramp Compensation
CR1 CR2
RFB1
VOUT
CLEAD
RLEAD
Lead Compensation
RFB2
COUT
19-100047; Rev 0; 9/17

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MAX38800
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Absolute Maximum Ratings
VDDH to GND (Note 1)...........................................-0.3V to +23V
VX to GND (DC).....................................................-0.3V to +23V
VX to GND (AC) (Notes 1, 2)..................................-10V to +23V
VDDH to VX (DC)....................................................-0.3V to +23V
VDDH to VX (AC) (Notes 1, 2).................................-10V to +23V
BST to GND (DC)................................................-0.3V to +25.5V
BST to GND (AC) (Notes 1, 2)...............................-7V to +25.5V
BST to VX Differential...........................................-0.3V to +2.5V
VCC to AGND........................................................-0.3V to +2.5V
OE, PGM, SENSE+, SENSE- to GND..................-0.3V to +2.5V
STAT to AGND.........................................................-0.3V to +4V
Junction Temperature (TJ)................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Peak Reflow Temperature Lead-Free.............................. +260°C
Operating Ratings
Input Voltage (VDDH)................................................. 6.5V to 14V
Bias Supply Voltage (VCC)................................... 1.71V to 1.89V
Output Current (IOUT) .............................................................9A
Junction Temperature (TJ) ...................................0°C to +125°C
Peak Output Current (IPK_MAX).............................................30A
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.
Package Information
PACKAGE TYPE: 19 WLCSP
PACKAGE CODE
C192B2+1
Outline Number
21-0915
Land Pattern Number
90-0544
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
Junction to Case (θJC)
32°C/W (typ) (Note 3)
1°C/W (max)
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: Input HF capacitors placed not more than 60 mils away from the VDDH pin are required to keep inductive voltage spikes
within Absolute Maximum Ratings limits.
Note 2: AC is limited to 25ns.
Note 3: Data taken using Maxim’s evaluation kit with no air flow and no heatsink.
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Maxim Integrated 2

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MAX38800
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Electrical Characteristics
(VCC = 1.8V ±5%, VDDH = 12V unless otherwise specified. Limits are 100% tested at TA = +25°C and TA = +85°C. Limits over the
operating temperature range and relevant supply voltage range are guaranteed by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
SUPPLY VOLTAGES, SUPPLY CURRENT, TEMPERATURE RANGE
12V Supply Voltage Range
1.8V Supply Voltage Range
VDDH
VCC
Note 8
Note 8
CCM (Note 8)
VCC Supply Current
ICC DCM (Note 8)
Shutdown (Note 8)
VREF
Programmable Reference
Voltage
See Table 3 (Note 9)
VREF Tolerance (VREF_TOL)
VREF Tolerance Temperature
Coefficient (VREFT_COEFF)
External Reference Voltage
(SENSE-)
VREF
T = 35°C (Note 4)
0°C < TJ < 100°C (Note 4)
FEEDBACK LOOP
RSENSE GAIN
SWITCHING FREQUENCY
Low fSW Threshold
Forced Minimum fSW
INPUT PROTECTION
Rising VDDH UVLO Threshold
Falling VDDH UVLO Threshold
Hysteresis
Rising VDDH OVLO Threshold
Falling VDDH OVLO Threshold
Hysteresis
Rising VCC UVLO Threshold
Falling VCC UVLO Threshold
Hysteresis
Rising VBST UVLO Threshold
Falling VBST UVLO Threshold
Hysteresis
Gain
See Table 3 (Note 9)
DCM enabled
fSW DCM enabled. The low fSW
threshold has been crossed.
VDDH
UVLO
(Note 8)
VDDH
OVLO
(Note 8)
(Note 8)
VCC UVLO
(Note 8)
VBST UVLO
MIN
TYP
MAX UNITS
6.5 14
1.71 1.8 1.89
35
25
32 196
V
V
mA
µA
0.6
0.95
-0.5 +0.5
V
%
0.0106 %/°C
0.5 1.1 V
1.05
2.1
30
60
mV/A
kHz
kHz
5.8
5.2
14.2
13.8
1.46
1.43
1.49
1.41
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
mV
V
V
mV
V
V
mV
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Maxim Integrated 3

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MAX38800
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Electrical Characteristics (continued)
(VCC = 1.8V ±5%, VDDH = 12V unless otherwise specified. Limits are 100% tested at TA = +25°C and TA = +85°C. Limits over the
operating temperature range and relevant supply voltage range are guaranteed by design and characterization.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
OUTPUT VOLTAGE PROTECTION (OVP)
Overvoltage-Protection Rising
Threshold
OVP Deglitch Filter Time
OVP
(Note 5)
8.5 13 16
25 30 36
%
µs
Power Good Protection Falling
Power Good Protection Rising
Power Good Deglitch Filter
PWRGD
(Note 5)
(Note 5)
5
9 12.5
%
3 6 9.5 %
25 30 36
µs
OVERCURRENT PROTECTION (OCP)
6.6
Positive OCP Threshold
(POCP)
Negative OCP Threshold
(NOCP)
Valley current (Note 9)
OCP
8.5 A
10
-6.9
-8.5 A
-10
POCP Threshold Tolerance
Referenced to nominal value
(Note 5) (Note 8)
-20
+20 %
NOCP Threshold Tolerance
Referenced to nominal value
(Note 5) (Note 8)
-26
+26 %
Hysteresis (Note 6)
Referenced to inception value (Note 8)
15
%
OVERTEMPERATURE PROTECTION (OTP)
OTP Inception Threshold
Hysteresis
OTP
Note 8
130 140 150
-25 -10
°C
°C
TEMPERATURE REPORTING
Temperature Reporting Range
Temperature Reporting
Tolerance
TJ Note 8
0 125 °C
-8 +8 °C
CURRENT REPORTING
Current Reporting Range
0 9A
Current Reporting Tolerance
ILOAD
From no load to full load (Note 8)
Full load (Note 8)
-1.5
-5
+1.5
+5
A
%
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Maxim Integrated 4

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MAX38800
Integrated, Step-Down Switching Regulator With
Selectable Applications Configurations
Electrical Characteristics (continued)
(VCC = 1.8V ±5%, VDDH = 12V unless otherwise specified. Limits are 100% tested at TA = +25°C and TA = +85°C. Limits over the
operating temperature range and relevant supply voltage range are guaranteed by design and characterization.)
PARAMETER
OE PIN
Input Range
Rising Threshold
Falling Threshold
Hysteresis
Deglitch Filter Time
OE Pin Input Resistance
STARTUP TIMING
Enable Time from OE Rise to
Start of Regulation
Soft-Start Ramp Time
Dwell Time at VOUT
(DCM Not Allowed)
Timing to Charge Boost
Capacitor
STAT PIN
Pullup Voltage
Status Output Low
Current Sinking Capability
Status Output High Leakage
Current
Time from VOUT Ramp
Completion to STAT Pin
Released
Fault Clearing
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
VOE(H)
VOE(L)
(Note 8)
Full VCC supply range. Measured at
OE Pin (Note 8)
(Note 5) (Note 8)
0
0.98
0.44
0.35
UVLO < VCC < OVLO (Note 8)
300
1.09
0.66
0.44
375
430
1.89
1.3
0.80
0.61
480
V
V
V
V
ns
kΩ
tEN
tSS See Table 3 (Note 9)
tSETTLE
tBST
185 300 500
1.5
3
6
14 35
8
µs
ms
µs
µs
VOHSTAT
VOLSTAT
ISTAT
ISTAT = 4mA (Note 8)
ISTAT = 0.2mA,
0V < VCC < UVLO and
0V <VDDH < UVLO (Note 8)
ISTAT = 1.3mA,
0V < VCC < UVLO and
0V < VDDH < UVLO (Note 8)
VSTAT = 0.4V (Note 8)
STAT pulled to 3.3V through 20kΩ
(Note 8)
tSTAT
STAT output low-to-high.
See Table 3. (Note 9)
Bad to good delay
3.6 V
0.4
0.67
V
0.76
3 11
7
128
2000
2
mA
µA
µs
ms
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Maxim Integrated 5