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MAX38640/1/2/3/A/B
EVALUATION KIT AVAILABLE
Tiny
1.8V
-
5.5V Input, 330nA
nanoPower Buck
ICQo, n7v0e0rmteAr
General Description
The MAX3864xA/B are nanoPower family of ultra-low
330nA quiescent current buck (step-down) DC-DC con-
verters operating from 1.8V to 5.5V input voltage and sup-
porting load currents of up to 175mA, 350mA, 700mA with
peak efficiencies of 96%. While in shutdown, there is only
5nA of shutdown current. The devices offer ultra-low qui-
escent current, small total solution size, and high efficien-
cy throughout the load range. The MAX3864xA/B are ide-
al for battery applications where long battery life is a must.
The MAX3864xA/B family utilizes a unique control scheme
that allows ultra-low quiescent current and high efficiency
over a wide output current range. MAX38642 excludes ac-
tive discharge resistor in shutdown which allows the out-
put to be regulated or held high by another source or by
the charged output capacitor.
The MAX3864xA/B devices are offered in a space-saving
1.42mm x 0.89mm 6-pin wafer-level package (WLP) (2
x 3 bumps, 0.4mm pitch), as well as a 2mm x 2mm,
6-pin µDFN package. All parts are specified from -40°C to
+85°C.
Benefits and Features
● Extends Battery Life
• 330nA Ultra-Low Quiescent Supply Current
• 5nA Shutdown Current
• 96% Peak Efficiency and Over 88% at 10µA
● Easy to Use – Addresses Popular Operation
• 1.8V to 5.5V Input Range
• Preprogrammed VOUT from 0.5V to 5V
• Single Resistor Adjustable VOUT from 0.7V to 3.3V
• ±1.75% Output Voltage Accuracy
• Up to 175mA/350mA/700mA Load Current
● Protects System in Multiple Use Cases
• Reverse-Current Blocking in Shutdown
• Optional Active Discharge Feature
● Reduces Size and Increases Reliability
• -40°C to +85°C Temperature Range
• 2mm x 2mm 6-pin µDFN Package
• 1.42mm x 0.89mm, 0.4mm Pitch 6-pin (2 x 3) WLP
Ordering Information appears at end of data sheet.
Applications
● Portable Space-Constrained Consumer Products
● Wearable devices, Ultra-Low-Power IoT, NB IoT, and
BLE
● Single Li-ion and Coin Cell Battery Products
● Wired, Wireless, Industrial Products
Typical Operating Circuit
INPUT 1.8V-5.5V
CIN
10µF
2.2µH
IN LX OUT
MAX38640A
RSEL
EN GND
OUTPUT 1.8V
COUT
22µ F
RSEL
768kΩ
19-100410; Rev 0; 10/18

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MAX38640/1/2/3/A/B
Tiny 1.8V - 5.n5aVnIonPpouwt,e3r3B0uncAkICQ,o7n0ve0rmteAr
Absolute Maximum Ratings
IN, EN, RSEL, NC, OUT to GND.............................. -0.3V to +6V
LX RMS Current WLP ............................. -1.6ARMS to +1.6ARMS
LX RMS Current µDFN.................................. -1ARMS to +1ARMS
Continuous Power Dissipation - WLP (TA = +70°C) (Derate
10.5mW/°C above +70°C) ................................................ 840mW
Continuous Power Dissipation – µDFN (TA = +70°C) (Derate
4.5mW/°C above +70°C) ...............................................357.8mW
Operating Temperature Range .............................-40°C to +85°C
Maximum Junction Temperature ...................................... +150°C
Storage Temperature Range ..............................-65°C to +150°C
Lead Temperature (soldering, 10 seconds) ...................... +300ºC
Soldering Temperature (reflow) ........................................ +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.
Package Information
6 µDFN
Package Code
L622+1C
Outline Number
21-0164
Land Pattern Number
90-0004
Thermal Resistance, Four Layer Board:
Junction-to-Ambient (θJA)
Junction-to-Case Thermal Resistance (θJC)
223.6°C/W
122°C/W
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.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/
thermal-tutorial.
6 WLP
Package Code
Outline Number
N60E1+2
21-100128
Land Pattern Number
Refer to Application Note 1891
Thermal Resistance, Four Layer Board:
Junction-to-Ambient (θJA)
95.15°C/W
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.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/
thermal-tutorial.
www.maximintegrated.com
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MAX38640/1/2/3/A/B
Tiny 1.8V - 5.n5aVnIonPpouwt,e3r3B0uncAkICQ,o7n0ve0rmteAr
Electrical Characteristics
(VIN = 3.3V, VOUT = 1.8V, TA = -40°C to +85°C, CIN = 4.7µF, COUT = 10µF, unless otherwise specified. (Note 1))
PARAMETER
Shutdown Current
Input Voltage Range
Input Undervoltage
Lockout
Output Voltage Range
Output Accuracy
DC Line Regulation
Quiescent Supply
Current Into IN
Quiescent Supply
Current Into OUT
Soft-Start Slew Rate
LX Leakage Current
Inductor Peak Current
Limit
High-Side RDSON
Low-Side RDSON
Zero-Crossing
Threshold
Enable Input Leakage
Enable Voltage
Threshold
Active Discharge
Resistance ( MAX3860/
MAX3861/MAX3863
Only)
SYMBOL
IIN_SD
VIN_RANGE
VUVLO
VUVLO
VOUT_RANGE
VOUT_ACC
VLREG
IQ_IN
IQ_OUT
dVOUT/dt
ILEAK_LX
IPEAK_LX
RDS_H
RDS_L
CONDITIONS
VEN = 0V, TA = 25°C
Guaranteed by Output Accuracy
RSEL > 50kΩ
(MAX3864xA),
MAX3864xB
VIN rising
Hysteresis
RSEL < 50kΩ
(MAX3864xA)
VIN rising
Hysteresis
Guaranteed by Output Accuracy
OUT falling, when LX begins switching
above 1MHz, VOUT = 0.7V to 3.3V, VIN =
5.5V (Note 2)
VOUT = 1.8V, VIN = 2.0V to 5.5V, IOUT =
10mA to 160mA
VEN = VIN, not switching VOUT = 106% of
target voltage, VOUT TARGET = 2.5V, TA
= 25°C
VEN = VIN, not switching VOUT = 106% of
target voltage, VOUT TARGET = 2.5V,
TA = 25°C
VOUT = 1.8V, no load
VLX = VIN = 5.5V, TA = 25°C
MAX38643
MAX38641/MAX38642
MAX38640
MAX38643
VIN = 3.3V
MAX38641/
MAX38642
MAX38640
MAX38643
VIN = 3.3V
MAX38641/
MAX38642
MAX38640
IZX_LX
ILEAK_EN
VEN_R
VEN_F
VOUT = 1.2V, percent of IPEAK_LX
VEN = 5.5V, TA = +25°C
VEN rising
VEN falling
ROUT_DIS VEN = 0V,
MIN
1.8
0.5
-1.75
800
400
225
0.4
50
TYP
0.005
1.75
50
2.6
125
±1.5
330
10
6.5
2
1000
500
250
95
170
320
50
80
150
5
0.1
0.8
0.7
85
MAX
0.1
5.5
1.8
2.7
5
+1.75
660
100
1200
600
300
150
320
600
90
160
290
100
1.2
200
UNITS
µA
V
V
mV
V
mV
V
%
%
nA
nA
mV/µs
nA
mA
%
nA
V
Ω
www.maximintegrated.com
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MAX38640/1/2/3/A/B
Tiny 1.8V - 5.n5aVnIonPpouwt,e3r3B0uncAkICQ,o7n0ve0rmteAr
Electrical Characteristics (continued)
(VIN = 3.3V, VOUT = 1.8V, TA = -40°C to +85°C, CIN = 4.7µF, COUT = 10µF, unless otherwise specified. (Note 1))
PARAMETER
Required Select
Resistor Accuracy
(MAX3864xA only)
Select Resistor
Detection Time
(MAX3864xA Only)
Thermal Shutdown
Thermal Shutdown
Threshold
SYMBOL
RSEL
CONDITIONS
Use the nearest ±1% resistor from RSEL
Selection Table
tRSEL
TSHUT
TSHUT
CSEL < 2pF
TJ rising when output turns off
TJ falling when output turns on
MIN
-1
240
TYP
600
165
150
MAX
+1
UNITS
%
1320
µs
°C
ºC
Note 1: Limits over the specified operating temperature and supply voltage range are guaranteed by design and characterization, and
production tested at room temperature only.
Note 2: Output Accuracy in Low Power Mode (LPM) and does not include load, line or ripple.
www.maximintegrated.com
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MAX38640/1/2/3/A/B
Tiny 1.8V - 5.n5aVnIonPpouwt,e3r3B0uncAkICQ,o7n0ve0rmteAr
Typical Operating Characteristics
(MAX38640AENT+, VIN = 3.6V, VOUT = 1.8V, L = 2.2μH, CIN = 10μF, COUT = 22μF, TA = 25°C, unless otherwise noted.)
www.maximintegrated.com
Maxim Integrated | 5