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MAX17031
User Manual
24 pgs585.12 Kb0

Rainbow Electronics MAX17031 User Manual

General Description
The MAX17031 is a dual Quick-PWM™ step-down power-supply (SMPS) controller with synchronous recti­fication, intended for main 5V/3.3V power generation in battery-powered systems. Low-side MOSFET sensing provides a simple low-cost, highly efficient current sense for valley current-limit protection. Combined with the output overvoltage and undervoltage protection fea­tures, this current limit ensures robust output supplies.
The 5V/3.3V SMPS outputs can save power by operat­ing in pulse-skipping mode or in ultrasonic mode to avoid audible noise. Ultrasonic mode forces the con­troller to maintain switching frequencies greater than 20kHz at light loads. The SKIP input also has an accu­rate logic threshold, allowing it to be used as a sec­ondary feedback input to refresh an external charge pump or secondary winding without overcharging the output voltages.
An internal 100mA linear regulator generates the 5V bias needed for power-up or other low-power “always­on” suspend supplies. An internal bypass circuitry allows automatic bypassing of the linear regulator when the 5V SMPS is active.
The device includes independent shutdown controls with well-defined logic thresholds to simplify power-up and power-down sequencing. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target over a 1ms peri­od. To prevent the output from ringing below ground in shutdown, the internal voltage target is ramped down from its previous value to zero over a 1ms period. A combined power-good (PGOOD) output simplifies the interface with external controllers. The MAX17031 is available in a 24-pin thin QFN (4mm x 4mm) package.
Applications
Notebook Computers
Ultra-Mobile PC
Main System Supply (5V and 3.3V Supplies)
2 to 4 Li+ Cells Battery-Powered Devices
Telecommunication
Features
o Dual Quick-PWM
o Preset 5V and 3.3V Outputs
o Internal 100mA, 5V Linear Regulator
o Internal OUT1 LDO5 Bypass Switch
o Secondary Feedback (SKIP Input) Maintains
Charge Pump
o 3.3V, 5mA Real-Time Clock (RTC) Power (Always
On)
o 2V ±1% 50µA Reference
o 6V to 24V Input Range
o Pulse-Skipping/Forced-PWM/Ultrasonic Mode
Control
o Independent SMPS and LDO5 Enable Controls
o Combined SMPS PGOOD Outputs
o Minimal Component Count
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration
Ordering Information
19-4305; Rev 0; 10/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX17031ETG+ -40°C to +85°C 24 TQFN-EP*
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
TOP VIEW
LX2
DH2
ON2
SKIP
OUT2
ILIM2
*EXPOSED PAD.
19
20
21
22
23
24
BST2
DL2
1718 16 14 13
MAX17031
+
12
REF
ONLDO
THIN QFN
4mm × 4mm
DD
GND
V
15
456
3
CC
V
RTC
*EP
DL1
IN
BST1
LDO5
12
LX1
DH1
11
ON1
10
9
PGOOD
ILIM1
8
OUT1
7
MAX17031
Dual Quick-PWM Step-Down Controller with Low­Power LDO and RTC Regulator for MAIN Supplies
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°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.
IN to GND ...............................................................-0.3V to +28V
V
DD
, VCCto GND .....................................................-0.3V to +6V
RTC, LDO5, ONLDO to GND ...................................-0.3V to +6V
OUT2 to GND ...........................................................-0.3V to +6V
ON1, ON2, PGOOD to GND.....................................-0.3V to +6V
OUT1 to GND..........................................-0.3V to (V
LDO5
+ 0.3V)
SKIP to GND...............................................-0.3V to (V
CC
+ 0.3V)
REF, ILIM1, ILIM2 to GND..........................-0.3V to (V
CC
+ 0.3V)
DL_ to GND ................................................-0.3V to (V
DD
+ 0.3V)
BST_ to GND ..........................................................-0.3V to +36V
BST_ to V
DD
............................................................-0.3V to +30V
DH1 to LX1 ..............................................-0.3V to (V
BST1
+ 0.3V)
BST1 to LX1..............................................................-0.3V to +6V
DH2 to LX2 ..............................................-0.3V to (V
BST2
+ 0.3V)
BST2 to LX2..............................................................-0.3V to +6V
LDO5, RTC, REF Short Circuit to GND.......................Momentary
RTC Current Continuous.....................................................+5mA
LDO5 Current (Internal Regulator) Continuous ..............+100mA
LDO5 Current (Switched Over) Continuous ...................+200mA
Continuous Power Dissipation (T
A
= +70°C) 24-Pin, 4mm x 4mm Thin QFN (T2444-3)
(derate 27.8mW/°C above +70°C).................................2.22W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note: Measurements are valid using a 20MHz bandwidth limit.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLIE S
IN Input Voltage Range LDO5 in regulation 6 24 V
V
= 6V to 24V, ON1 = ON2 = GND,
IN Standby Supply Current
IN Shutdown Supply Current
IN Supply Current I
VCC Bias Supply Current I
IN
VCC
PWM CO NTROLLERS
OUT1 Output-Voltage Accuracy V
OUT2 Output-Voltage Accuracy V
OUT1
OUT2
Load Regulation Error
Line Regulation Error Either SMPS, IN = 6V to 28V 0.005 %/V
DH1 On-Time t
DH2 On-Time t
Minimum Off-Time t
Soft-Start Slew Rate t
Ultrasonic Operating Frequenc y f
ON1
ON2
OFF(MIN)
SS
SW(USONIC) VSKIP
IN
ONLDO = RTC
V
= 4.5V to 24V,
IN
ON1 = ON2 = ONLDO = GND
ON1 = ON2 = VCC, V V
= 5.3V, V
OUT1
ON1 = ON2 = VCC, V
= 5.3V, V
V
OUT1
V
= 1.8V 4.95 5.00 5.05 V
SKIP
V
= 1.8V 3.267 3.30 3.333 V
SKIP
Either SMPS, V
Either SMPS, V
Either SMPS, V
V
= 5.0V (Note 1) 895 1052 1209 ns
OUT1
V
= 3.3V (Note 1) 833 925 1017 ns
OUT2
(Note 1) 300 400 ns
Rising/fal ling edge on ON1 or ON2 1 m s
= GND 20 34 kHz
85 175 µA
40 70 µA
= VCC;
OUT2
OUT2
SKI P
SKI P
SKI P
SKIP
= 3.5V
SKIP
= 3.5V
= 1.8V, I
= GND, I
= VCC, I
= VCC;
= 0 to 5A -0.1
LOAD
= 0 to 5A -1.7
LOAD
= 0 to 5A -1.5
LOAD
0.1 0.2 mA
0.7 1.5 mA
%
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LINEAR REGULATOR (LDO5)
LDO5 Output-Voltage Accuracy V
LDO5 Short-Circuit Current LDO5 = GND 100 260 mA
LDO5 Regulation Reduction/ Bootstrap Switchover Threshold
LDO5 Bootstrap Switch Resistance LDO5 to OUT1, V
VCC Undervoltage Lockout Threshold
Thermal-Shutdown Thresho ld T
3.3V ALWAYS-ON LINEAR REGULATOR (RTC)
RTC Output-Voltage Accuracy V
RTC Short-Circuit Current RTC = GND 5 22 mA
REFERENCE (REF)
Reference Voltage V
Reference Load Regulation Error V
REF Lockout Voltage V
OUT1 FAULT DETECTION
OUT1 Overvoltage and PGOOD Trip Threshold
OUT1 Overvoltage Fault Propagation De la y
OUT1 Undervoltage Protect ion Trip Threshold
OUT1 Output Undervoltage Fault Propagation Delay
OUT2 FAULT DETECTION
OUT2 Overvoltage and PGOOD Trip Threshold
OUT2 Overvoltage Fault Propagation De la y
OUT2 Undervoltage Protect ion Trip Threshold
OUT2 Output Undervoltage Fault Propagation De la y
LDO5
SHDN
RTC
REF
REF IREF
REF(UVLO)
t
OVP
t
UVP
t
OVP
t
UVP
VIN = 6V to 24V, ON1 = GND, 0 < I
Fal ling edge of OUT1 -11.0 -8.8 -6.0
Rising edge of OUT1 -7.0
Fal ling edge of VCC, PWM disabled below this threshold
Rising edge of V
Hysteresis = 10°C 160 °C
ON1 = ON2 = GND, VIN = 6V to 24V, 0 < I
ON1 = ON2 = ONLDO = GND, V
IN
VCC = 4.5V to 5.5V, I
Rising edge, 350mV (typ) hysteresis 1.95 V
With respect to error comparator thresho ld 10 13 16 %
OUT1 forced 50mV above trip threshold 10 µs
With respect to error comparator thresho ld 65 70 75 %
10 µs
With respect to error comparator thresho ld 10 13 16 %
OUT2 forced 50mV above trip threshold 10 µs
With respect to error comparator thresho ld 65 70 75 %
10 µs
< 100mA
LDO5
= 5V (Note 3) 1.9 4.5
OUT1
4.2
CC
< 5mA
RTC
= 6V to 24V, 0 < I
= -20µA to +50µA -10 +10 mV
< 5mA
RTC
= 0 1.980 2.00 2.020 V
REF
4.90 5.0 5.10 V
3.8 4.0 4.3
3.23 3.33 3.43
3.19 3.47
%
V
V
MAX17031
Dual Quick-PWM Step-Down Controller with Low­Power LDO and RTC Regulator for MAIN Supplies
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PO WER-GOOD
PGOOD Lower Trip Thresho ld
PGOOD Prop agation De lay t
PGOOD Output Low Voltage
PGOOD Leakage Current I
CURRENT LIMIT
ILIM_ Adjustment Range 0.2 2 V
ILIM_ Current 5 µA
Valley Current-Limit Threshold (Adjustable)
Current-Limit Threshold (Negative)
Ultrasonic Current-Limit Threshold V
Current-Limit Threshold (Zero Crossing)
GATE DRIVERS
DH_ Gate-Driver On-Resistance R
DL_ Gate-Driver On-Resistance R
DH_ Gate-Driver Source/Sink Current
DL_ Gate-Driver Source Current
DL_ Gate-Driver Sink Current I
Dead Time t
Internal BST_ Switch On-Resistance
BST_Leakage Current
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
With respect to either error comparator threshold, falling edge, hysteresis = 1%
PGOOD
PGOOD
V
LIM_ (VAL) VAGND
V
NEG
NEG(US)
V
I
DH
I
DL
(SOURCE)
DL (SINK)
DEAD
R
BST IBST
OUT1 or OUT2 forced 50mV beyond PGOOD trip threshold, falling edge
ON1 or ON2 = GND (PGOOD low impedance), I
OUT1 and OUT2 in regulation (PGOOD high impedance), PGOOD forced to 5.5V, T
= +25°C
A
- VLX_
With respect to valley current-lim it threshold, V
V
ZX
DH
DL
= 3.5V, V
OUT2
V
- VLX_,
AGND
V
= VCC or GND
SKIP
BST1 - LX1 and BST2 - LX2 forced to 5V 1.5 3.5
DL1, DL2; high state 1.4 4.5
DL1, DL2; low state 0.5 1.5
DH1, DH2 forced to 2.5V, BST1 - LX1 and BST2 - LX2 forced to 5V
DL1, DL2 forced to 2.5V 1.7 A
DL1, DL2 forced to 2.5V 3.3 A
DL1, DL2 rising (Note 4) 30
DH1, DH2 ri sing (Note 4) 35
_ = 10mA, VDD = 5V 5.5
V
_ = 26V, TA = +25°C;
BST
OUT1 and OUT2 above regulation threshold
SINK
SKIP
= 4mA
R
_ = 100k
ILIM
(V
_ = 500mV)
ILIM
R
_ = 200k
ILIM
(V
_ = 1.00V)
ILIM
R
_ = 400k
ILIM
(V
_ = 2.00V)
ILIM
= V
REF
= 5.3V 20 mV
OUT1
-16 -13 -10 %
10 µs
0.3 V
1 µA
44 50 56
90 100 110
180 200 220
-120 %
1.5 mV
2 A
0.1 5 µA
mV
ns
MAX17031
_______________________________________________________________________________________ 5
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
INPUTS AND OUTPUTS
SKIP Input Thresholds
SKIP Leakage Current V
ON_ Input-Logic Le ve l s ONLDO, ON1, ON2
ON_ Leakage Current
OUT_ Leakage Current V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Upper SKIP/PWM threshold falling edge, 33mV hysteresis
Lower PWM/ultrasonic threshold 0.4 1.6
= 0 or 5V, TA = +25°C -1 +1 µA
SKIP
High (SMPS on) 2.4
Low (SMPS off) 0.8
V
= V
ON1
T
= +25°C
A
= V
ON1
ON2
ON2
= V
= V
ONLDO
CC
= 0 or 5V,
V
= 5.3V 15 65
OUT1
= 3.5V 5 30
V
OUT2
1.94 2.0 2.06
-2 +2 µA
V
V
µA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLIE S
IN Input Voltage Range LDO5 in regulation 6 24 V
V
= 6V to 24V, ON1 = ON2 = GND,
IN Standby Supply Current
IN Shutdown Supply Current
IN Supply Current I
VCC Bias Supply Current I
PWM CO NTROLLERS
OUT1 Output-Voltage Accuracy V
OUT2 Output-Voltage Accuracy V
DH1 On-Time t
DH2 On-Time t
Minimum Off-Time t
Ultrasonic Operating Frequenc y f
OFF(MIN)
SW(USONIC) VSKIP
IN
VCC
OUT1
OUT2
ON1
ON2
IN
ONLDO = RTC
V
= 4.5V to 24V,
IN
ON1 = ON2 = ONLDO = GND
ON1 = ON2 = VCC, V V
= 5.3V, V
OUT1
ON1 = ON2 = VCC, V V
= 5.3V, V
OUT1
V
= 1.8V 4.90 5.10 V
SKIP
V
= 1.8V 3.234 3.366 V
SKIP
V
= 5.0V (Note 1) 895 1209 ns
OUT1
V
= 3.3V (Note 1) 833 1017 ns
OUT2
(Note 1) 400 ns
= GND 18 kH z
OUT2
OUT2
= VCC,
SKIP
= 3.5V
= VCC,
SKIP
= 3.5V
200 µA
70 µA
0.2 mA
1.5 mA
MAX17031
Dual Quick-PWM Step-Down Controller with Low­Power LDO and RTC Regulator for MAIN Supplies
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LINEAR REGULATOR (LDO5)
LDO5 Output-Voltage Accuracy V
LDO5 Short-Circuit Current LDO5 = GND 260 mA
LDO5 Regulation Reduction/ Bootstrap Switchover Threshold
LDO5 Bootstrap Switch Resistance
VCC Undervoltage Lockout Threshold
3.3V ALWAYS-ON LINEAR REGULATOR (RTC)
RTC Output-Voltage Accuracy V
RTC Short-Circuit Current RTC = GND 5 22 mA
REFERENCE (REF)
Reference Voltage V
Reference Load Regulation Error V
OUT1 FAULT DETECTION
OUT1 Overvoltage and PGOOD Trip Threshold
OUT1 Undervoltage Protection Trip Threshold
OUT2 FAULT DETECTION
OUT2 Overvoltage and PGOOD Trip Threshold
OUT2 Undervoltage Protection Trip Threshold
PO WER-GOOD
PGOOD Lower Trip Thresho ld
PGOOD Output Low Voltage
LDO5
RTC
REF
REF IREF
VIN = 6V to 24V, ON1 = GND; 0mA < I
Fal ling edge of OUT1 -12.0 -5.0 %
LDO5 to OUT1, V
Fal ling edge of VCC, PWM disabled below this threshold
ON1 = ON2 = GND, VIN = 6V to 24V, 0 < I
RTC
ON1 = ON2 = ONLDO = GND, VIN = 6V to 24V, 0 < I
VCC = 4.5V to 5.5V, I
= -20µA to +50µA -10 +10 mV
With respect to error comparator threshold 10 16 %
With respect to error comparator thresho ld 63 77 %
With respect to error comparator threshold 10 16 %
With respect to error comparator threshold 63 77 %
With respect to either error comparator threshold, falling edge, hysteresis = 1%
ON1 or ON2 = GND (PGOOD low impedance), I
< 100mA
LDO5
< 5mA
< 5mA
RTC
SINK
= 5V (Note 3) 4.5
OUT1
= 0 1.975 2.025 V
REF
= 4mA
4.85 5.15 V
3.8 4.3 V
3.18 3.45
3.16 3.50
-16 -10 %
0.3 V
V
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= V
SKIP
= 5V, ONLDO = RTC, ON1 = ON2
= V
CC
, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Note 1: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, V
BST
= 5V, and a 500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times might be different due to MOSFET switching speeds.
Note 2: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
Note 3: Specification increased by 1Ω to account for test measurement error. Note 4: Production tested for functionality only.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CURRENT LIMIT
ILIM_ Adjustment Range 0.2 2 V
R
_ = 100k
ILIM
_ = 500mV)
(V
ILIM
Valley Current-Limit Threshold (Adjustable)
GATE DRIVERS
DH_ Gate-Driver On-Resistance R
DL_ Gate-Driver On-Resistance R
INPUTS AND OUTPUTS
SKIP Input Thresholds
ON_ Input-Logic Le ve l s ONLDO, ON1, ON2
V
LIM_ (VAL) VAGND
DH
DL
- VLX_
BST1 - LX1 and BST2 - LX2 forced to 5V 3.5
DL1, DL2; high state 4.5
DL1, DL2; low state 1.5
Upper SKIP/PWM threshold falling edge, 33mV hysteresis
Lower PWM/ultrasonic threshold 0.4 1.6
R
_ = 200k
ILIM
_ = 1.00V)
(V
ILIM
_ = 400k
R
ILIM
_ = 2.00V)
(V
ILIM
High (SMPS on) 2.4
Low (SMPS off) 0.8
40 60
85 115
164 236
1.94 2.06
mV
V
V
MAX17031
Dual Quick-PWM Step-Down Controller with Low­Power LDO and RTC Regulator for MAIN Supplies
8 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, TA= +25°C, unless otherwise noted.)
5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
100
95
90
85
80
75
7V
70
EFFICIENCY (%)
65
60
55
50
0.01 10 LOAD CURRENT (A)
3.3V OUTPUT EFFICIENCY vs. LOAD CURRENT
100
SKIP MODE
95
90
85
80
75
70
EFFICIENCY (%)
65
60
55
50
0.01 10
ULTRASONIC MODE
LOAD CURRENT (A)
12V
20V
10.1
PWM MODE
10.1
SKIP MODE
PWM MODE
12V INPUT
100
SKIP MODE
95
MAX17031 toc01
90
85
80
75
70
EFFICIENCY (%)
65
60
55
50
0.01 10
SMPS OUTPUT-VOLTAGE DEVIATION
3
MAX17031 toc04
2
ULTRASONIC MODE
1
0
-1
PWM MODE
OUTPUT-VOLTAGE DEVIATION (%)
-2
-3
0.01 10
5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
PWM MODE
ULTRASONIC MODE
10.1
LOAD CURRENT (A)
vs. LOAD CURRENT
LOW-NOISE
SKIP MODE
10.1
LOAD CURRENT (A)
12V INPUT
12V INPUT
100
95
MAX17031 toc02
90
85
80
75
70
EFFICIENCY (%)
65
60
55
50
0.01 10
1000
MAX17031 toc05
100
10
SWITCHING FREQUENCY (kHz)
1
0.01 10
3.3V OUTPUT EFFICIENCY vs. LOAD CURRENT
7V
LOAD CURRENT (A)
SWITCHING FREQUENCY
vs. LOAD CURRENT
PWM MODE
ULTRASONIC MODE
SKIP MODE
LOAD CURRENT (A)
MAX17031 toc03
12V
20V
SKIP MODE
PWM MODE
10.1
MAX17031 toc06
LOW-NOISE
12V INPUT
10.1
5V LDO OUTPUT VOLTAGE
3.3V RTC OUTPUT VOLTAGE
vs. LOAD CURRENT
5.2
5.1
5.0
4.9
OUTPUT VOLTAGE (V)
4.8
4.7 0160
LOAD CURRENT (mA)
100 120 14020 40 60 80
MAX17031 toc07
OUTPUT VOLTAGE (V)
3.5
3.4
3.3
3.2
3.1
3.0 012
vs. LOAD CURRENT
MAX17031 toc08
810246
LOAD CURRENT (mA)
NO-LOAD INPUT SUPPLY CURRENT
vs. INPUT VOLTAGE
100
ICC + I
DD
10
1
SUPPLY CURRENT (mA)
0.1
SKIP MODE
0.01 025
INPUT VOLTAGE (V)
PWM MODE
LOW-NOISE
ULTRASONIC MODE
MAX17031 toc09
2051015
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