MAXM17626AMB+T [MAXIM]
2.7V to 5.5V, 600mA Himalaya uSLIC Step-Down Power Modules;
| 型号： | MAXM17626AMB+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 2.7V to 5.5V, 600mA Himalaya uSLIC Step-Down Power Modules |
| 文件： | 总19页 (文件大小：2099K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Applications
General Description
•
•
•
•
•
Point-of-Load Power Supply
Standard 5V Rail Supplies
Battery Powered Applications
Distributed Power Systems
The Himalaya series of voltage regulator ICs, power
modules, and chargers enable cooler, smaller, and
simpler power supply solutions. MAXM17625 and MAX-
M17626 are high-frequency Himalaya synchronous
TM
Industrial Sensors and Process Control
step-down DC-DC uSLIC
modules with integrated
MOSFETs, compensation components, and inductors,
that operate over a wide 2.7V to 5.5V input voltage
range. MAXM17625 and MAXM17626 support up to
600mA load current and allow use of small, low-cost
input and output capacitors. The output voltage can be
adjusted from 0.8V to 3.3V. The modules significantly
reduce design complexity, manufacturing risks, and offer
a true plug-and-play power supply solution, reducing
time-to-market.
Benefits and Features
•
Easy to Use
• 2.7V to 5.5V Input
• Adjustable 0.8V to 3.3V Output
• ±1% Feedback Accuracy
• Up to 600mA Output Current
• Fixed 2MHz or 4MHz Operation
• 100% Duty-Cycle Operation
• Internally Compensated
• All Ceramic Capacitors
The MAXM17625 and MAXM17626 modules employ
peak-current-mode control architecture under steady-
state operation. To reduce input inrush current, the
devices offer a fixed 1ms soft-start time. Both modules
feature selectable PWM or PFM mode of operation at
light loads. When PWM mode is selected, MAXM17625
operates at a fixed 2MHz switching frequency and
MAXM17626 operates at a fixed 4MHz switching
frequency. MAXM17625 offers output voltages from
0.8V to 1.5V and MAXM17626 offers output voltages
from 1.5V to 3.3V.
•
•
•
High Efficiency
• Selectable PWM- or PFM- Mode of Operation
• Shutdown Current as low as 0.1μA (typ)
Flexible Design
• Internal Soft-Start and Prebias Startup
• Open-Drain Power Good Output (PGOOD Pin)
Robust Operation
• Overtemperature Protection
• -40°C to + 125°C Ambient Operating
Temperature/ -40°C to +150°C Junction
Temperature
The MAXM17625 and MAXM17626 modules are avail-
able in a low profile, compact 10-pin, 2.6mm x 2.1mm x
1.3mm, uSLIC package.
•
Rugged
• Passes Drop, Shock, and Vibration Standards:
JESD22-B103, B104, B111
Ordering Information appears at end of data sheet.
Typical Application Circuit
19-101020; Rev 0; 1/21
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Absolute Maximum Ratings
IN to PGND ............................................................-0.3V to 6V
EN, PGOOD, FB, OUTSNS to SGND.....................-0.3V to 6V
MODE to SGND ........................................-0.3V to (IN + 0.3V)
LX, OUT to PGND.....................................-0.3V to (IN + 0.3V)
PGND to SGND...................................................-0.3V to 0.3V
Output Short-Circuit Duration................................. Continuous
Junction Temperature (Note 1) .................................... +150°C
Storage Temperature Range ........................... -55°C to 125°C
Lead Temperature (Soldering, 10s) ............................. +260°C
Soldering Temperature (reflow).................................... +260°C
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
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: 10-PIN uSLIC
Package Code
M102A2+1
21-100245
90-100084
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR LAYER BOARD †
Junction-to-Ambient (θ
)
77°C/W
JA
† Package thermal resistance is measured on an evaluation board with natural convection.
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.
Electrical Characteristics
(V = V
= 3.6V, V
= V
= V
= V = V = 0V, LX = OUT = PGOOD = OPEN, T = T = -40°C to +125°C,
FB OUTSNS A J
IN EN
SGND
PGND
MODE
unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted.) (Note 2)
A
PARAMETER
INPUT SUPPLY (V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
)
IN
Input-Voltage Range
V
2.7
5.5
V
IN
I
V
= 0, shutdown mode
0.1
40.0
4.5
6
IN-SHDN
EN
μA
I
PFM Mode, No Load
Q-PFM
Input-Supply Current
PWM Mode, MAXM17625
PWM Mode, MAXM17626
I
mA
Q-PWM
Undervoltage Lockout
Threshold (UVLO)
V
IN Rising
2.55
2.6
2.65
V
IN_UVLO
V
IN_UVLO_HY
S
UVLO Hysteresis
200
mV
ENABLE (EN)
EN Low Threshold
EN High Threshold
EN Input Leakage
V
EN Falling
EN Rising
0.8
50
V
V
EN_LOW
V
2
EN_HIGH
I
EN = 5.5V, T = T = 25°C
10
nA
EN
A
J
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Maxim Integrated | 2
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
(V = V
IN EN
= 3.6V, V
SGND
= V
PGND
= V
MODE
= V = V = 0V, LX = OUT = PGOOD = OPEN, T = T = -40°C to +125°C,
FB OUTSNS A J
unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced to SGND, unless otherwise noted.) (Note 2)
A
PARAMETER
TIMING
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAXM17625
MAXM17626
1.92
3.84
2.00
4.00
40
2.08
4.16
Switching Frequency
f
MHz
SW
Minimum ON time
Maximum Duty Cycle
Soft-Start time
t
ns
%
ON_MIN
D
100
MAX
t
1
ms
SS
FEEDBACK (FB)
FB Regulation Voltage
FB Voltage Accuracy
FB Input Bias Current
V
0.8
V
%
FB-REG
V
PWM Mode
-1
+1
FB
FB
I
FB = 0.6V, T = T = 25°C
50
10
nA
A
J
OUTSNS Input Bias
current
I
V
= 5.5V
μA
OUTSNS-BIAS
OUTSNS
POWER GOOD (PGOOD)
PGOOD Rising
Threshold
PGOOD Falling
Threshold
V
V
FB Rising
FB Falling
91.5
88
93.5
90
95.5
%
PGOOD_RISE
92
%
mV
nA
PGOOD_FALL
PGOOD Output Low
V
I
= 5mA
200
100
OL_PGOOD
PGOOD
PGOOD Output
I
PGOOD = 5.5V, T = T = 25°C
LEAK_PGOOD
A
J
Leakage Current
PGOOD Deassertion Af-
ter Soft-Start
184
5
μs
MODE
MODE Pullup Current
THERMAL SHUTDOWN
V
= GND
μA
MODE
Thermal Shutdown Risi-
ng Threshold
Thermal Shutdown
Hysteresis
165
10
°C
°C
Electrical specifications are production tested at T = +25°C. Specifications over the entire operating temperature range
A
Note 2:
are guaranteed by design and characterization.
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Maxim Integrated | 3
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics
(V = V = 5V, V
= V = 0V, LX = Open, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN EN SGND
PGND A A
All voltages are referenced to SGND, unless otherwise noted. The circuit values for different output voltage applications are as in Table
1, unless otherwise noted.)
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Maxim Integrated | 4
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V = V = 5V, V
= V = 0V, LX = Open, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN EN SGND
PGND A A
All voltages are referenced to SGND, unless otherwise noted. The circuit values for different output voltage applications are as in Table
1, unless otherwise noted.)
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Maxim Integrated | 5
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V = V = 5V, V
= V = 0V, LX = Open, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN EN SGND
PGND A A
All voltages are referenced to SGND, unless otherwise noted. The circuit values for different output voltage applications are as in Table
1, unless otherwise noted.)
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Maxim Integrated | 6
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V = V = 5V, V
= V = 0V, LX = Open, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN EN SGND
PGND A A
All voltages are referenced to SGND, unless otherwise noted. The circuit values for different output voltage applications are as in Table
1, unless otherwise noted.)
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Maxim Integrated | 7
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V = V = 5V, V
= V = 0V, LX = Open, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN EN SGND
PGND A A
All voltages are referenced to SGND, unless otherwise noted. The circuit values for different output voltage applications are as in Table
1, unless otherwise noted.)
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Maxim Integrated | 8
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Operating Characteristics (continued)
(V = V = 5V, V
= V = 0V, LX = Open, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN EN SGND
PGND A A
All voltages are referenced to SGND, unless otherwise noted. The circuit values for different output voltage applications are as in Table
1, unless otherwise noted.)
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Maxim Integrated | 9
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Pin Configuration
TOP VIEW
LX
1
2
3
4
5
10
9
IN
PGND
SGND
EN
OUTSNS
MAXM17625/
MAXM17626
8
7
6
FB
PGOOD
MODE
OUT
INDICATES PIN 1 OF THE MODULE
Pin Descriptions
PIN
NAME
FUNCTION
Switching Node of the Inductor. No external connection.
1
LX
Sense Pin for Module V
Kelvin connection.
. Connect to the positive terminal of the output capacitor (C
) through a
OUT
OUT
2
3
OUTSNS
FB
Output Feedback Connection. Connect FB to the center of the external resistor-divider from OUT to
SGND to set the output voltage.
Open-Drain Power Good Output. Connect the PGOOD pin to the IN pin through an external pullup
resistor to generate a “high” level if the output voltage is above 93.5% of the target regulated voltage. If
not used, leave this unconnected. The PGOOD is driven low if the output voltage is below 90% of the
target regulated voltage.
4
PGOOD
PWM or PFM Mode Selection Input. Connect the MODE pin to SGND to enable PWM-mode operation.
Leave the MODE pin unconnected to enable PFM mode operation.
5
6
7
8
MODE
OUT
Module Output Pin. Connect the output capacitor C
from OUT to PGND.
OUT
Enable Input. Logic-high voltage on the EN pin enables the device, while logic-low voltage disables the
device.
EN
SGND
Signal GND Pin
Power Ground Pin of the Converter. Connect externally to the power ground plane. Connect the SGND
9
PGND
IN
and PGND pins together at the ground return path of the V bypass capacitor. Refer to the
MAXM17625/MAXM17626 evaluation kit data sheet for a layout example.
Power-Supply Input. Decouple the IN pin to PGND with a capacitor placed close to the IN and PGND
pin.
IN
10
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Maxim Integrated | 10
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Functional Diagram
Internal Diagram
MAXM17625/
MAXM17626
IN
HIGH-SIDE
DRIVER
+
-
EN
LX
2V/0.8V
1.5µH (MAXM17625)/
1µH(MAXM17626)
OUT
OSCILLATOR
SOFT-START
CONTROLLER
SGND
LOW-SIDE
DRIVER
CONTROLLE-
MODE
OUTSNS
PGND
LOGIC
MODE-
SELECTION
LOGIC
SLOPE
COMPENSATION
MODE
FB
PGOOD
PGOOD
LOGIC
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Maxim Integrated | 11
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Detailed Description
MAXM17625/MAXM17626 are high-frequency synchronous step down DC-DC converter modules with integrated
MOSFETs, compensation components, and inductors that operate over a 2.7V to 5.5V input-voltage range. MAXM17625
and MAXM17626 support up to 600mA load current and allow use of small, low-cost input and output capacitors. The
output voltage can be adjusted from 0.8V to 3.3V.
When the EN pin is asserted, an internal power-up sequence ramps up the error-amplifier reference, resulting in output-
voltage soft-start. The FB pin monitors the output voltage through a resistor-divider. The devices select either PFM or
forced-PWM mode depending on the state of the MODE pin at power-up. By pulling the EN pin low, the devices enter
shutdown mode and consume only 0.1μA (typ) of standby current.
The modules use an internally compensated, fixed-frequency, peak-current mode control scheme. On the falling edge of
an internal clock, the high-side pMOSFET turns on, and continues to be on during normal operation until at least the rising
edge of the clock (for 40ns). An internal error amplifier compares the feedback voltage to a fixed internal reference voltage
and generates an error voltage. The error voltage is compared to a sum of the current-sense voltage and a slope-
compensation voltage by a PWM comparator to set the on-time. During the on-time of the pMOSFET, the inductor current
ramps up. For the remainder of the switching period (off-time), the pMOSFET is kept off and the low-side nMOSFET turns
on. During the off-time, the inductor releases the stored energy as the inductor current ramps down, providing current to
the output. Under overload conditions, the cycle-by-cycle current-limit feature limits the inductor peak current by turning
off the high-side pMOSFET and turning on the low-side nMOSFET.
Mode Selection (MODE)
The logic state of the MODE pin is latched after the EN pin goes above its rising threshold and all internal voltages are
ready to allow LX switching. If the MODE pin is unconnected at power-up, the part operates in PFM mode at light loads.
If the MODE pin is grounded at power-up, the part operates in constant-frequency PWM mode at all loads. State changes
on the MODE pin are ignored during normal operation.
PWM Mode
In PWM mode, the module output current is allowed to go negative. PWM operation is useful in frequency sensitive
applications and provides fixed switching frequency operation at all loads. However, PWM mode of operation gives lower
efficiency at light loads compared to PFM-mode of operation.
PFM Mode
PFM mode of operation disables negative inductor current from the module and skips pulses at light loads for better
efficiency. At low load currents, if the peak value of the inductor current is less than 350mA for 64 consecutive cycles,
and the inductor current reaches zero, the part enters PFM mode. In PFM mode, when the FB pin voltage is below 0.8V,
the high-side switch is turned on until the inductor current reaches 500mA. After the high-side switch is turned off, the
low-side switch is turned on until the inductor current comes down to zero and LX enters a high-impedance state. If the
FB pin voltage is greater than 0.8V for 3 consecutive CLK falling edges after LX enters a high-impedance state, the
module continues to operate in PFM mode. In PFM mode, the part hibernates when the FB pin voltage is above 0.8V for
5 consecutive switching cycles after LX enters a high-impedance state. If the FB pin voltage drops below 0.8V within 3
consecutive CLK falling edges after LX enters a high-impedance state, the part comes out of PFM mode.
EN Input (EN), Soft-Start
When EN voltage is above 2V (min), the internal error-amplifier reference voltage starts to ramp up. The duration of the
soft-start ramp is 1ms (typ), allowing a smooth increase of the output voltage. Driving EN low disables both power
MOSFETs, as well as other internal circuitry, and reduces IN quiescent current to below 0.1μA.
Power Good (PGOOD)
The devices include an open-drain power good output that indicates the output voltage status. PGOOD goes high when
the output voltage is above 93.5% of the target value and goes low when the output voltage is below 90% of the target
value. During start-up, the PGOOD pin goes high after 184μs of soft-start completion.
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Maxim Integrated | 12
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Startup into a Prebiased Output
The devices are capable of soft-start into a prebiased output without discharging the output capacitor in both the PFM
and forced-PWM modes. Such a feature is useful in applications where digital integrated circuits with multiple rails are
powered.
Overcurrent Protection
The MAXM17625/MAXM17626 are provided with a robust overcurrent protection (OCP) scheme that protects the
modules under overload and output short-circuit conditions. When overcurrent is detected in the inductor, the switches
are controlled by a mechanism, which detects both the high-side MOSFET and low-side MOSFET currents and compares
them with the respective limits. Whenever the inductor current exceeds the internal peak current limit of 1.45A (typ), the
high-side MOSFET is turned off and the low-side MOSFET is turned ON. The low side MOSFET is kept on until the
subsequent CLK rising edge after the inductor current drops below 1.14A (typ). The high-side MOSFET is turned on after
the low-side MOSFET is turned off and the cyclic operation continues. When the overload condition is removed, the part
regulates output to the set voltage.
The MAXM17625/MAXM17626 are designed to support a maximum load current of 600mA. The inductor ripple current
is calculated as follows.
For MAXM17625:
V
− VOUT − 0.191 x IOUT
L x fSW
VOUT + 0.236 x IOUT
ꢀN
∆I = [
] x [
]
V
− 0.13 x IOUT
ꢀN
For MAXM17626:
where,
V
− VOUT − 0.157 x IOUT
L x fSW
VOUT + 0.202 x IOUT
ꢀN
∆I = [
] x [
]
V
− 0.13 x IOUT
ꢀN
V
V
= Steady-state output voltage
OUT
= Operating input voltage
IN
f
= Switching Frequency (2MHz for MAXM17625, 4MHz for MAXM17626)
SW
L = Power module output inductance (1.5μH ±20% for MAXM17625, 1μH ±20% for MAXM17626)
= Required output (load) current
I
OUT
The following condition should be satisfied at the desired load current (IOUT):
∆ꢀ
IOUT
+
< 1.15
ꢁ
Thermal Overload Protection
Thermal overload protection limits the total power dissipation in the device. When the junction temperature exceeds
+165°C, an on-chip thermal sensor shuts down the device, turns off the internal power MOSFETs, allowing the device to
cool down. The thermal sensor turns the device on after the junction temperature cools by 10°C.
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Maxim Integrated | 13
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Applications Information
Selection of Input Capacitor
The input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on
the input caused by the circuit switching.
The input capacitor RMS current requirement (I
) is defined by the following equation:
RMS
V
OUT
x (V − VOUT)
√
ꢀN
IRMS = IOUT MAX
x
(
)
V
ꢀN
where I
is the maximum load current. I
has a maximum value when the input voltage equals twice the
RMS
OUT(MAX)
output voltage (V = 2 x V
), so I
OUT
= I /2.
RMS(MAX) OUT(MAX)
IN
Choose an input capacitor that exhibits less than +10°C temperature rise at the RMS input current for optimal long-term
reliability. Use low-ESR ceramic capacitors with high-ripple-current capability at the input. X7R capacitors are
recommended in industrial applications for their temperature stability. Calculate the input capacitance using the following
equation:
(1 − 퐷)
CꢀN = IOUT MAX x D x
(
)
η x ∆V x fSW
ꢀN
where,
D = Duty ratio of the converter
f
= Switching frequency
SW
η = Efficiency
ΔVIN = Allowable input voltage ripple
Selection of Output Capacitor
Small ceramic X7R-grade capacitors are sufficient and recommended for the device. The output capacitor has two
functions. It filters the square wave generated by the device along with the internal inductor. It stores sufficient energy to
support the output voltage under load transient conditions and stabilizes the device’s internal control loop. Usually the
output capacitor is sized to support a step load of 50% of the maximum output current in the application, such that the
output-voltage deviation is less than 3%. Derating of ceramic capacitors with DC-voltage must be considered while
selecting the output capacitor. Refer to Table 1 for recommended output capacitors.
Adjusting the Output Voltage
The MAXM17625/MAXM17626 output voltage can be programmed from 0.8V to 3.3V. Set the output voltage by
connecting a resistor-divider from output to FB to SGND (see Figure 2).
Choose R2 to be less than 37.4kΩ and calculate R1 with the following equation:
VOUT
ꢂ1 = ꢂ2 x (
− 1)
0.8
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Maxim Integrated | 14
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
MAXM17625/
MAXM17626
10
9
1
2
3
4
5
IN
PGND
LX
+
C
C
IN
OUT
OUTSNS
R1
SGND
8
FB
OUT
MAXM17625/
MAXM17626
FB
7
EN
PGOOD
MODE
R2
OUT
6
R2
R1
VIA FOR ROUTING EN TO IN PLANE
Figure 1. Layout Guidelines
Figure 2. Setting the Output Voltage
Table 1. Selection of Components
VIN(MIN)
(V)
VIN(MAX)
(V)
VOUT
(V)
PART
NUMBER
R1
(kΩ)
R2
(kΩ)
CIN
COUT
1 x 2.2μF 0603 10V
GRM188R71A225KE15
1 x 2.2μF 0603 10V
1 x 22μF 0805 6.3V
GRM21BZ70J226ME44#
1 x 22μF 0805 6.3V
2.7
2.7
2.7
2.7
2.7
2.7
2.7
3.6
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
0.8
1.0
1.2
1.5
1.5
1.8
2.5
3.3
0
37.4
37.4
37.4
37.4
37.4
37.4
37.4
37.4
9.53
19.1
33.2
33.2
49.9
79.6
118
GRM188R71A225KE15
1 x 2.2μF 0603 10V
GRM21BZ70J226ME44#
1 x 22μF 0805 6.3V
MAXM17625
GRM188R71A225KE15
1 x 2.2μF 0603 10V
GRM21BZ70J226ME44#
1 x 22μF 0805 6.3V
GRM188R71A225KE15
1 x 2.2μF 0603 10V
GRM21BZ70J226ME44#
1 x 10μF 0603 10V
GRM188Z71A106KA73#
GRM188R71A225KE15
1 x 2.2μF 0603 10V
1 x 10μF 0603 10V
GRM188Z71A106KA73#
GRM188R71A225KE15
1 x 2.2μF 0603 10V
MAXM17626
1 x 10μF 0603 10V
GRM188Z71A106KA73#
GRM188R71A225KE15
1 x 2.2μF 0603 10V
1 x 10μF 0603 10V
GRM188Z71A106KA73#
GRM188R71A225KE15
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Maxim Integrated | 15
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Power Dissipation
The power dissipation inside the module leads to an increase in the junction temperature of the MAXM17625 and
MAXM17626. The power loss inside the modules at full load can be estimated as follows:
1
P
ꢃOSS
= POUT x ꢄ − 1ꢅ
η
Where η is the efficiency of the power module at the desired operating conditions. The junction temperature T of the
J
module can be estimated at any given maximum ambient temperature T from the following equation:
A
ꢆ = ꢆA + ꢄ휃퐽퐴 × PꢃOSSꢅ
J
For the MAXM17625/MAXM17626 evaluation board, the thermal resistance from junction to ambient (θ ) is 77°C/W.
JA
Operating the module at junction temperatures greater than +125°C degrades operating lifetimes. An EE-Sim model is
available for the MAXM17625/MAXM17626 to simulate efficiency and power loss for the desired operating conditions.
PCB Layout Guidelines
Careful PCB layout is critical to achieving low switching losses and clean, stable operation.
Use the following guidelines for good PCB layout:
•
•
•
•
•
•
Keep the input capacitors as close as possible to the IN and PGND pins.
Keep the output capacitors as close as possible to the OUT and PGND pins.
Keep the resistive feedback divider as close as possible to the FB pin.
Connect all of the PGND connections to a copper plane area as large as possible on the top and bottom layers.
Use multiple vias to connect internal PGND planes to the top layer PGND plane.
Keep the power traces and load connections short. This practice is essential for high efficiency. Using thick copper
PCBs (2oz vs. 1oz) can enhance full-load efficiency. Correctly routing PCB traces is a difficult task that must be
approached in terms of fractions of centimeters, where a single mΩ of excess trace resistance causes a measura-
ble efficiency penalty.
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Maxim Integrated | 16
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Application Circuits
Typical Application Circuit (0.8V, 600mA)
MAXM17625
2.7V TO 5.5V
V
IN
IN
OUTSNS
C
2.2µF
IN
0.8V, 600mA
EN
OUT
V
OUT
C
OUT
22µF
PGND
FB
PGOOD
MODE
SGND
R1
0Ω
R2
37.4kΩ
LX
MODE:
C
C
: 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
IN
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
: 22µF/X7R/6.3V/0805 (GRM21BZ70J226ME44)
OUT
f
: 2MHz
SW
Typical Application Circuit (1.5V, 600mA)
MAXM17625
2.7V TO 5.5V
V
IN
IN
OUTSNS
C
2.2µF
IN
1.5V, 600mA
EN
OUT
V
OUT
C
22µF
OUT
R1
33.2kΩ
PGND
FB
PGOOD
MODE
SGND
R2
37.4kΩ
LX
C
C
: 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
: 22µF/X7R/6.3V/0805 (GRM21BZ70J226ME44)
IN
MODE:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
OUT
f
: 2MHz
SW
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Maxim Integrated | 17
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Typical Application Circuit (1.5V, 600mA)
MAXM17626
2.7V TO 5.5V
V
IN
IN
OUTSNS
C
2.2µF
IN
1.5V, 600mA
EN
OUT
V
OUT
C
OUT
10µF
PGND
FB
PGOOD
MODE
SGND
R1
33.2kΩ
R2
37.4kΩ
LX
C
C
: 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
IN
MODE:
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
: 10µF/X7R/10V/0603 (GRM188Z71A106KA73)
OUT
f
: 4MHz
SW
Typical Application Circuit (3.3V, 600mA)
MAXM17626
3.6V TO 5.5V
V
IN
IN
OUTSNS
C
2.2µF
IN
3.3V, 600mA
EN
OUT
V
OUT
C
OUT
10µF
PGND
FB
PGOOD
MODE
SGND
R1
118kΩ
R2
37.4kΩ
LX
MODE:
C
C
: 2.2µF/X7R/10V/0603 (GRM188R71A225KE15)
IN
CONNECT TO GND FOR PWM MODE
UNCONNECTED FOR PFM MODE
: 10µF/X7R/10V/0603 (GRM188Z71A106KA73)
OUT
f
: 4MHz
SW
Ordering Information
PART NUMBER
TEMP RANGE
PIN-PACKAGE
V
(V)
OUT
MAXM17625AMB+
MAXM17625AMB+T
MAXM17626AMB+
MAXM17626AMB+T
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
-40ºC to +125ºC
10-pin 2.6mm x 2.1mm x 1.35mm uSLIC
10-pin 2.6mm x 2.1mm x 1.35mm uSLIC
10-pin 2.6mm x 2.1mm x 1.35mm uSLIC
10-pin 2.6mm x 2.1mm x 1.35mm uSLIC
0.8 to 1.5
0.8 to 1.5
1.5 to 3.3
1.5 to 3.3
+ Denotes lead(Pb)-free/RoHS compliance.
T = Tape and reel.
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Maxim Integrated | 18
MAXM17625/MAXM17626
2.7V to 5.5V, 600mA Himalaya uSLIC
Step-Down Power Modules
Revision History
REVISION
NUMBER
0
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
1/21
Initial release
—
uSLIC is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2021 Maxim Integrated Products, Inc.
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