Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -40°C to +150°C
Soldering Temperature (reflow) .......................................+260°C
Note 1:
LX has internal clamp diodes to PGND and V
IN
. Applications that forward bias these diodes should not exceed the ICs
package power dissipation limits.
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 WLP
Package Code
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
JA
)
95.15°C/W
W60H1+1
21-100206
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.
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.
Electrical Characteristics
(V
IN
= 3.8V, V
FB
= 0.6V, typicals are at T
A
= +25°C. Limits are 100% production tested at T
A
= +25°C. Limits over the operating
temperature range (T
A
= -40°C to +85°C) are guaranteed by design and characterization, unless otherwise noted.)
PARAMETER
Input Voltage Range
Input Undervoltage
Lockout
Shutdown Supply
Current
Supply Quiescent
Current
FB Voltage Accuracy
FB Input Current
SYMBOL
V
IN
V
IN_UVLO_R
V
IN_UVLO_F
I
SHDN_85C
I
SHDN_25C
I
Q_SKIP
V
FB
I
FB
V
IN
rising
V
IN
falling
EN = LOW, T
A
= -40°C to +85°C
EN = LOW, T
A
= +25°C
No switching, no load, leakage from EN
is not included
No load, PWM mode
0.588
-0.7
-1
CONDITIONS
MIN
2.5
2.605
2.25
2.65
2.3
1
+0.1
40
0.6
0.612
+0.7
+1
TYP
MAX
4.8
2.695
2.35
UNITS
V
V
µA
µA
V
μA
www.maximintegrated.com
Maxim Integrated
│
2
MAX77324
4.8V
IN
, 1.5A High-Efficiency,
Ultra-Small Buck Converter
Electrical Characteristics (continued)
(V
IN
= 3.8V, V
FB
= 0.6V, typicals are at T
A
= +25°C. Limits are 100% production tested at T
A
= +25°C. Limits over the operating
temperature range (T
A
= -40°C to +85°C) are guaranteed by design and characterization, unless otherwise noted.)
PARAMETER
Output Voltage Ripple
Line Regulation
Load Regulation
Line Transient Response
Load Transient
Response
Soft-Start Slew Rate
Peak Current Limit
Valley Current Limit
NMOS Zero-Crossing
Threshold
High-Side PMOS ON
Resistance
Low-Side NMOS ON
Resistance
Switching Frequency
Turn-On Delay Time
Minimum Effective
Output Capacitance
Output Active Discharge
Resistance
LX Leakage Current
Thermal Shutdown
EN Logic High Threshold
EN Logic Low Threshold
EN Pulldown Resistance
I
LIM_PEAK
I
LIM_VALLEY
I
ZX
R
DSON-HS
R
DSON_LS
f
SW
t
ON_DLY
C
EFF_MIN
R
DISCHG
I
LK_25C
I
LK_85C
T
SHDN
V
EN_HI
V
EN_LO
R
PD
Skip region of operation
IN to LX, I
TEST
= -150mA
LX to PGND, I
TEST
= 150mA
V
OUT
= 1V, I
OUT
= 1A
From EN asserting to LX switching (Note 2)
0mA ≤ I
OUT
≤ 1.5A (Note 2)
Resistance from LX to PGND, EN = 0V
V
LX
= 0V or 4.8V, T
A
= +25°C
V
LX
= 0V or 4.8V, T
A
= +85°C (Note 3)
Rising, 15°C hysteresis
T
A
= +25°C
T
A
= +25°C
Pulldown resistance from EN to AGND
250
500
1.2
0.4
1000
-1
8
100
0.1
1
165
+1
SYMBOL
V
OUT_PP_SKIP
CONDITIONS
C
OUT
= 8μF (derated capacitance), skip region
of operation V
OUT
= 1.2V (Note 2)
MIN
TYP
20
mV
10
0.2
0.185
30
30
2.34
2.63
3.00
1.1
30
100
50
2
220
3.37
%/V
%/A
mV
mV
mV/µs
A
A
mA
mΩ
mΩ
MHz
µs
µF
Ω
µA
°C
V
V
kΩ
MAX
UNITS
C
OUT
= 8μF (derated capacitance), PWM
V
OUT_PP_PWM
region of operation (Note 2)
V
LINE
V
LOAD
V
OS1
, V
US1
V
OS2
, V
US2
V
IN
= 2.5V to 4.8V
(Note 2)
I
OUT
= 750mA, V
IN
changes from 3.4V to 2.9V
in 25µs (20mV/µs), L = 0.47µH, C
OUT_NOM
=
22µF (Note 2)
I
OUT
changes from 0A to 750mA in 6µs,
L = 0.47µH, C
OUT_NOM
= 22µF (Note 2)
Regulated at FB pin, V
OUT
= 0.6V, see the
Soft-Start
section for more details (Note 2)
Note 2:
Guaranteed by design. Not production tested.
Note 3:
Guaranteed by ATE characterization. Not directly tested in production.
www.maximintegrated.com
Maxim Integrated
│
3
MAX77324
4.8V
IN
, 1.5A High-Efficiency,
Ultra-Small Buck Converter
Typical Operating Characteristics
(V
IN
= +3.8V, T
A
= +25°C, unless otherwise noted. Inductor part number: GLULKR4701A.
80
70
SUPPLY CURRENT (µA)
QUIESCENT CURRENT
EN = V
IN
FOR I
Q
toc 01
3.0
2.5
SUPPLY CURRENT (µA)
2.0
1.5
1.0
0.5
0.0
-0.5
SHUTDOWN CURRENT
toc 02
95
90
EFFICIENCY vs. LOAD
0.6V OUTPUT
toc 03
60
50
40
30
20
10
0
2
3
4
SUPPLY VOLTAGE (V)
5
6
V
OUT
= 1.8V
V
OUT
= 1.2V
V
OUT
= 1.0V
V
OUT
= 0.6V
EFFICIENCY (%)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
85
80
75
70
65
0.001
V
IN
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
-1.0
L = 0.47µH
R
BOT
= OPEN
R
TOP
= 0Ω
C
TOP
= OPEN
0.1
1
2
3
4
SUPPLY VOLTAGE (V)
5
6
0.01
I
OUT
(A)
95
90
85
80
75
70
65
0.001
EFFICIENCY vs. LOAD
1.0V OUTPUT
toc 04
95
90
85
80
75
70
65
0.001
EFFICIENCY vs. LOAD
1.2V OUTPUT
toc 05
95
90
85
80
75
70
65
0.001
EFFICIENCY vs. LOAD
1.8V OUTPUT
toc 06
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
V
IN
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
L = 0.47µH
R
BOT
= 30.1kΩ
R
TOP
= 20kΩ
C
TOP
= 220pF
0.01
0.1
I
OUT
(A)
1
V
IN
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
L = 0.47µH
R
BOT
= 30.1kΩ
R
TOP
= 30.1kΩ
C
TOP
= 220pF
0.01
0.1
I
OUT
(A)
1
V
IN
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
L = 0.47µH
R
BOT
= 30.1kΩ
R
TOP
= 60.4kΩ
C
TOP
= 220pF
0.01
0.1
I
OUT
(A)
1
0.64
0.63
0.62
0.61
V
OUT
(V)
LOAD REGULATION
0.6V OUTPUT
toc 07
L = 0.47µH
R
BOT
= OPEN
R
TOP
= 0Ω
C
TOP
= OPEN
1.04
1.03
1.02
1.01
V
OUT
(V)
1.00
0.99
0.98
0.97
LOAD REGULATION
1.0V OUTPUT
toc 08
L = 0.47µH
R
BOT
= 30.1kΩ
R
TOP
= 20kΩ
C
TOP
= 220pF
V
OUT
(V)
1.24
1.23
1.22
1.21
1.20
1.19
1.18
1.17
LOAD REGULATION
1.2V OUTPUT
toc 09
L = 0.47µH
R
BOT
= 30.1kΩ
R
TOP
= 30.1kΩ
C
TOP
= 220pF
0.60
0.59
0.58
0.57
0.56
0.0
0.5
I
OUT
(A)
V
IN
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
V
IN
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
0.0
0.5
I
OUT
(A)
1.0
1.5
V
IN
= 3.0V
V
IN
= 3.8V
V
IN
= 4.5V
0.0
0.5
I
OUT
(A)
1.0
1.5
1.0
1.5
0.96
1.16
www.maximintegrated.com
Maxim Integrated
│
4
MAX77324
4.8V
IN
, 1.5A High-Efficiency,
Ultra-Small Buck Converter
Typical Operating Characteristics (continued)
(V
IN
= +3.8V, T
A
= +25°C, unless otherwise noted. Inductor part number: GLULKR4701A.
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