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MAX1715EEI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
300
200
250
150
100
50
0
-40
0
-20
40
20
60
80
MAX1715-12
TEMPERATURE (
°
C)
FREQUENCY (kHz)
FREQUENCY vs. TEMPERATURE
(2.5V, 4A COMPONENTS, SKIP = HIGH)
C
A
B
MAX1715-16
A = V
OUT
, 2V/div
B = INDUCTOR CURRENT, 2A/div
C = DL, 10V/div
START-UP WAVEFORM
(2.5V, 4A COMPONENTS, ACTIVE LOAD)
700
500
600
400
300
100
200
0
0
10
5
20
15
25
30
MAX1715-13
INPUT VOLTAGE (V)
SUPPLY CURRENT (μA)
NO-LOAD SUPPLY CURRENT vs. INPUT VOLTAGE
(OUT1 = 1.8V, 4A COMPONENTS;
OUT2 = 2.5V, 4A COMPONENTS; SKIP = GND)
I
DD
I
CC
I
BATT
12
8
10
6
4
2
0
0
10
5
20
15
25
30
MAX1715-14
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
NO-LOAD SUPPLY CURRENT vs. INPUT VOLTAGE
(OUT1 = 1.8V, 4A COMPONENTS;
OUT2 = 2.5V, 4A COMPONENTS; SKIP = V
CC
)
I
DD
I
CC
I
IN
C
A
B
MAX1715-17
A = V
OUT
, AC-COUPLED, 100mV/div
B = INDUCTOR CURRENT, 5A/div
C = DL, 10V/div
LOAD-TRANSIENT RESPONSE
(1.3V, 8A COMPONENTS, SKIP = GND)
MAX1715
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
_______________________________________________________________________________________ 7
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, components from Table 1, V
IN
= +15V, SKIP = AGND, TON = unconnected, T
A
= +25°C, unless otherwise noted.)
C
A
B
MAX1715-19
A = V
OUT
, 2V/div
B = INDUCTOR CURRENT, 5A/div
C = DL, 10V/div
SHUTDOWN WAVEFORM
(2.5V, 4A COMPONENTS, SKIP = GND)
C
A
B
MAX1715-18
A = V
OUT
, 2V/div
B = INDUCTOR CURRENT, 5A/div
C = DL, 10V/div
OUTPUT OVERLOAD WAVEFORM
(2.5V, 4A COMPONENTS, SKIP = GND)
C
A
B
MAX1715-15
A = V
OUT
, AC-COUPLED, 100mV/div
B = INDUCTOR CURRENT, 2A/div
C = DL, 10V/div
LOAD-TRANSIENT RESPONSE
(2.5V, 4A COMPONENTS, SKIP = GND)
170
MAX1715
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
8 _______________________________________________________________________________________
Pin Description
OUT1 ON/OFF Control Input. Drive to AGND to turn OUT1 off. Drive to V
CC
to turn OUT1 on.
ON110
Feedback Input for OUT1. Connect to AGND for 1.8V fixed output or to V
CC
for 3.3V fixed output, or connect
to a resistor-divider from OUT1 for an adjustable output.
FB12
+2.0V Reference Voltage Connection. Bypass to AGND with 0.22µF (min) capacitor. Can supply 50µA for
external loads.
REF9
Output Voltage Connection for the OUT1 PWM. Connect directly to the junction of the external inductor and
output filter capacitors. OUT1 senses the output voltage to determine the on-time and also serves as the
feedback input in fixed-output modes.
OUT11
Pulse-Skipping Control Input. Connect to V
CC
for low-noise forced-PWM mode. Connect to AGND to enable
pulse-skipping operation.
SKIP
6
Power-Good Open-Drain Output. PGOOD is low when either FB_ input is more than 5.5% below the normal
regulation point (typ).
PGOOD7
Analog GroundAGND8
Current-Limit Threshold Adjustment for OUT1. The LX1-PGND current-limit threshold defaults to +100mV if
ILIM1 is connected to V
CC
. Or, connect an external resistor to AGND to adjust the limit. A precision 5µA pull-up
current through R
EXT
sets the threshold from 50mV to 200mV. The voltage on the pin is 10 times the current-
limit voltage. Choose R
EXT
equal to 2kΩ per mV of current-limit threshold (100kΩ to 400kΩ).
ILIM13
Battery Voltage Sense Connection. Connect to the input power source. V+ is used only to set the PWM one-
shot timing.
V+4
PIN
On-Time Selection Control Input. This is a four-level input used to determine DH_ on-time. The TON table
below is for V
IN
= 24V, V
OUT1
= 1.8V, V
OUT2
= 2.5V condition.
TON5
FUNCTIONNAME
OUT2 ON/OFF Control Input. Drive to AGND to turn OUT2 off. Drive to V
CC
to turn OUT2 on.
ON211
Current-Limit Threshold Adjustment for OUT2. The LX2-PGND current-limit threshold defaults to +100mV if
ILIM2 is connected to V
CC
. Or, connect an external resistor to AGND to adjust the limit. A precision 5µA pull-up
current through R
EXT
sets the threshold from 50mV to 200mV. The voltage on the pin is 10 times the current-
limit voltage. Choose R
EXT
equal to 2kΩ per mV of current-limit threshold (100kΩ to 400kΩ).
ILIM212
Feedback Input for OUT2. Connect to AGND for 2.5V fixed output, or connect to a resistor-divider from
OUT2 for an adjustable output.
FB213
Output Voltage Connection for the OUT2 PWM. Connect directly to the junction of the external inductor and
output filter capacitors. OUT2 senses the output voltage to determine the on-time and also serves as the
feedback input in fixed-output mode.
OUT214
No Connection. These pins are not connected to any internal circuitry. Connect the N.C. pins to the ground
plane to enhance thermal conductivity.
N.C.
15, 23,
28
AGND
TON
Open
V
CC
REF
235
345
485
620
Frequency (OUT1) (kHz) Frequency (OUT2) (kHz)
460
355
255
170
MAX1715
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
_______________________________________________________________________________________ 9
Pin Description (continued)
High-Side Gate Driver Output for OUT1. Swings from LX1 to BST1.DH126
High-Side Gate Driver Output for OUT2. Swings from LX2 to BST2.DH217
Boost Flying Capacitor Connection for OUT1. Connect to an external capacitor and diode according to the
Standard Application Circuit (Figure 1). See MOSFET Gate Drivers (DH_, DL_) section.
BST125
External Inductor Connection for OUT2. Connect to the switched side of the inductor. LX2 serves as the
lower supply voltage rail for the DH2 high-side gate driver and is the positive input to the OUT2 current-limit
comparator.
LX216
Analog-Supply Input. Connect to the system supply voltage, +4.5V to +5.5V, with a 20Ω series resistor.
Bypass to AGND with a 1µF ceramic capacitor.
V
CC
21
Power Ground. Connect directly to the low-side MOSFETs’ sources. Serves as the negative input of the cur-
rent-sense amplifiers.
PGND22
Low-Side Gate Driver Output for OUT1. DL1 swings PGND to V
DD
.DL124
Boost Flying Capacitor Connection for OUT2. Connect to an external capacitor and diode according to the
Standard Application Circuit (Figure 1). See MOSFET Gate Drivers (DH_, DL_) section.
BST218
Low-Side Gate-Driver Output for OUT2. DL2 swings from PGND to V
DD
.DL219
PIN
Supply Input for the DL Gate Drivers. Connect to the system supply voltage, +4.5V to +5.5V. Bypass to
PGND with a minimum 4.7µF ceramic capacitor.
V
DD
20
FUNCTIONNAME
External Inductor Connection for OUT1. Connect to the switched side of the inductor. LX1 serves as the
lower supply voltage rail for the DH1 high-side gate driver.
LX127
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

MAX1715EEI+

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Buy MAX1715EEI+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Dual Step-Down Controller
Lifecycle:
New from this manufacturer.
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