Operating Temperature Range (Note 1)........... -40°C to +125°C
Junction Temperature ....................................... -40°C to +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
IN to GND ..............................................................-0.3V to +70V
LX, EN/UVLO to GND .................................... -0.3V to IN + 0.3V
RT, OUTL, MODE/SYNC,
RESET
to GND .............-0.3V to +6V
INL to GND .......................-5.5V to lower of (V
IN
+ 0.6V) or +6V
FBBUCK to GND (MAX17670, MAX17671)............-5.5V to +6V
FBBUCK to GND (MAX17672) ...............................-0.3V to +6V
INL to FBBUCK ..........................................................-5V to +6V
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.
Note 1:
Junction temperature greater than +125°C degrades operating lifetimes.
Package Information
PACKAGE TYPE: 10-PIN TDFN
Package Code
Outline Number
Land Pattern Number
Junction to Ambient (θ
JA
)
Junction to Case (θ
JC
)
T1033+1C
21-0137
90-0003
41°C/W
9°C/W
THERMAL RESISTANCE, FOUR-LAYER BOARD:
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
Maxim Integrated
│
2
MAX17670, MAX17671,
MAX17672
Electrical Characteristics
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
(V
IN
= V
EN/UVLO
= 24V, V
INL
= 5V, V
FBBUCK
= 1.05 x V
FBBUCK-REG
, C
OUTL
= 2.2μF to GND, V
GND
= 0V, RT = LX = MODE/SYNC =
RESET
= unconnected, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are referenced
to GND, unless otherwise noted.) (Note 2)
PARAMETER
INPUT SUPPLY (IN)
Input-Voltage Range
Input-Shutdown Current
V
IN
I
IN-SH
I
Q-PFM
Input-Quiescent Current
V
FBBUCK
= 0.95 x V
FBBUCK-REG
, Normal
switching mode, V
INL
= 0V
V
FBBUCK
= 0.95 x V
FBBUCK-REG
, Normal
switching mode, V
INL
= 5V
V
EN/UVLO
rising
V
EN/UVLO
falling
V
EN/UVLO
= 1.3V, T
A
= 25°C
INL rising
1.19
1.068
-100
2.725
3.21
3
0.17
5.5
V
EN/UVLO
= 0V, T
A
= +25°C
4
2.5
70
1336
1000
μA
60
4.5
V
μA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
Q-PWM
ENABLE/UVLO (EN/UVLO)
EN/UVLO Threshold
EN/UVLO Input-Leakage Current
EXTERNAL BIAS (INL)
INL Switch Over Voltage
INL Switch Over Hysteresis
INL Operating Voltage Range
HIGH-SIDE MOSFET AND LOW-SIDE MOSFET DRIVER
High-Side pMOS
On-Resistance
Low-Side nMOS
On-Resistance
LX-Leakage Current
SOFT-START
Soft-Start Time
t
SS1
MODE/SYNC = GND, MAX17670
MODE/SYNC = unconnected, MAX17670
FBBUCK Regulation Voltage
V
FBBUCK-
REG
V
ENR
V
ENF
I
ENLKG
V
INL_TH
V
INL_HYS
1.215
1.09
1.24
1.112
100
3.21
V
nA
V
V
V
R
DS-ONH
R
DS-ONL
I
LX_LKG
I
LX
= 0.1A (Sourcing)
I
LX
= 0.1A (Sinking)
V
EN
= 0V, V
LX
= (V
GND
+1V) to (V
IN
- 1V),
T
A
= 25°C
-1
2.7
1.33
5.1
2.7
+1
Ω
Ω
μA
4.4
3.216
3.216
4.887
4.887
0.782
0.782
-100
5.1
3.3
3.35
5
5.075
0.8
0.812
10
5.8
3.365
3.425
5.087
5.188
0.814
0.830
ms
STEP-DOWN
CONVERTER FEEDBACK (FBBUCK)
MODE/SYNC = GND, MAX17671
MODE/SYNC = unconnected, MAX17671
MODE/SYNC = GND, MAX17672
MODE/SYNC = unconnected, MAX17672
MAX17670, MAX17671
MAX17672
V
FBBUCK Input-Bias Current
I
FBBUCK
μA
100
nA
www.maximintegrated.com
Maxim Integrated
│
3
MAX17670, MAX17671,
MAX17672
Electrical Characteristics (continued)
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
(V
IN
= V
EN/UVLO
= 24V, V
INL
= 5V, V
FBBUCK
= 1.05 x V
FBBUCK-REG
, C
OUTL
= 2.2μF to GND, V
GND
= 0V, RT = LX = MODE/SYNC =
RESET
= unconnected, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are referenced
to GND, unless otherwise noted.) (Note 2)
PARAMETER
CURRENT LIMIT
Peak Current-Limit Threshold
Sink Current-Limit Threshold
PFM Current-Limit Threshold
OSCILLATOR (RT)
Switching Frequency Accuracy
Switching Frequency
Switching Frequency
Adjustable Range
TIMING
Minimum On-Time
Minimum Off-Time
Minimum Off-Time during SYNC
Mode of Operation
HICCUP Timeout
MODE/SYNC
MODE/SYNC Internal
Pullup Resistor
SYNC Input Frequency
Minimum SYNC Pulse Width
SYNC Threshold
RESET
RESET
Output-Level Low
RESET
Output-Leakage Current
FBBUCK Threshold for
RESET
Rising
FBBUCK Threshold for
RESET
Falling
OUTL Threshold for
RESET
Rising
OUTL Threshold for
RESET
Falling
V
FBBUCKR
V
FBBUCKF
V
OUTLR
V
OUTLF
V
IH
V
IL
I
RESET
= 10mA
T
A
= +25°C, V
RESET
= 5.5V
FBBUCK rising (Note 3)
FBBUCK falling (Note 3)
OUTL rising (Note 3)
OUTL falling (Note 3)
-100
92
89
91.5
88
95
92
94.5
91
R
MODE
Mode = PFM
Mode = PWM
1.1 x
f
SW
100
2.1
0.8
400
100
98
95
%
97.5
94
32
1100
1.4 x
f
SW
ns
V
kΩ
t
ON_MIN
t
OFF_MIN
t
OFF_
MIN(SYNC)
SYMBOL
I
PEAK-LIMIT
I
SINK-LIMIT
I
PFM
CONDITIONS
MIN
245
TYP
295
105
1
92
MAX
345
145
120
+11
UNITS
mA
mA
mA
%
kHz
MODE/SYNC = GND
65
55
f
SW
= 200kHz to 2.2MHz
f
SW
See the
Switching Frequency (RT)
section for details
-11
536
200
610
680
2200
75
40
48
55
75
51
128
75
100
ns
ns
ns
ms
mV
nA
www.maximintegrated.com
Maxim Integrated
│
4
MAX17670, MAX17671,
MAX17672
Electrical Characteristics (continued)
Integrated 4V-60V, 150mA, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 50mA Linear Regulator
(V
IN
= V
EN/UVLO
= 24V, V
INL
= 5V, V
FBBUCK
= 1.05 x V
FBBUCK-REG
, C
OUTL
= 2.2μF to GND, V
GND
= 0V, RT = LX = MODE/SYNC =
RESET
= unconnected, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are referenced
to GND, unless otherwise noted.) (Note 2)
PARAMETER
RESET
Delay after FBBUCK
and V
OUTL
Reach 95%
Regulation
Linear Regulator Input-Voltage
Range
Linear Regulator Input-Quiescent
Current
Linear Regulator UVLO
Linear Regulator UVLO
Hysteresis
SYMBOL
t
D
CONDITIONS
See
Reset Output (RESET)
section
for details
MIN
TYP
2.1
MAX
UNITS
ms
LINEAR REGULATOR INPUT SUPPLY (INL)
V
INL
I
OUTL
= 0A, V
INL
= 5, V
FFBUCK
= 0.95 ×
V
FFBUCK-REG
, Normal Switching mode.
I
OUTL
= 0A, V
INL
= 2.5
2.11
2.35
710
μA
35
2.18
50
2.25
V
mV
5.5
V
I
INL
V
INL_UVLO
V
INL_
UVLO(HYS)
LINEAR REGULATOR OUTPUT VOLTAGE (OUTL)
V
INL
= 2.8V, I
OUTL
= 10mA,
V
OUTL
= 1.2V, 1.5V, 1.8V
V
INL
= V
OUTL
+ 0.8V, I
OUTL
= 10mA,
V
OUTL
= 2.5V, 3.0V, 3.3V
0.1mA < I
OUTL
< 50mA. V
INL
= 2.8V for
V
OUTL
= 1.2V, 1.5V, 1.8V; V
INL
= V
OUTL
+0.8V for V
OUTL
= 2.5V, 3.0V, 3.3V
V
DO
I
LDO_LIM
t
SS2
Temperature rising
V
INL
= V
OUTL
, I
OUTL
= 50mA (Note 4)
V
OUTL
= 70% of nominal value,
V
INL
= V
OUTL
+ 2V
55
-1.5
-1.33
0.5
200
84
1.1
160
20
+1.5
%
+1.33
0.9
400
%
mV
mA
ms
°C
°C
OUTL Accuracy
Load Regulation
Dropout Voltage
Linear Regulator Current Limit
Soft-Start Time
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Note 2:
All the Electrical Specifications are 100% production tested at T
A
= +25°C. Specifications over the operating temperature
range are guaranteed by design and characterization.
Note 3:
Specifications are in respect to regulation voltage.
Note 4:
Applicable for linear regulators with nominal output voltages of 2.5V, 3.0V, and 3.3V.
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