MAX8717ETI+ Maxim Integrated Products, MAX8717ETI+ Datasheet - Page 18

• Manufacturer Part Number: MAX8717ETI+
• Description: IC CNTRLR PWR SUP 28-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8717ETI+

• Applications: Controller, Notebook Computers
• Voltage - Input: 4 ~ 26 V
• Number Of Outputs: 2
• Voltage - Output: 3.3V, 5V, 1 ~ 5.5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
Table 4. SKIP_ Configuration Table
Table 5. Operating Modes Truth Table
18
DC output accuracy specifications in the Electrical
Characteristics refer to the error comparator’s thresh-
old. When the inductor continuously conducts, the
MAX8716/MAX8717/MAX8756/MAX8757 regulate the
peak of the output ripple, so the actual DC output volt-
age is lower than the slope-compensated trip level by
50% of the output ripple voltage. For PWM operation
(continuous conduction), the output voltage is accu-
rately defined by the following equation:
SKIP_
GND
V
REF
Output Undervoltage
MAX8716/MAX8717/
CC
Output Overvoltage
Thermal Shutdown
______________________________________________________________________________________
Protection (OVP)
Protection (UVP)
MAX8756 Only
Power-Up
Shutdown
MODE
Forced-PWM
Skip mode
Run
skip mode
Low-noise
MODE
mode
Fixed-frequency operation.
Constant output ripple voltage.
Able to source and sink current.
High efficiency at light loads.
Source-only applications.
Good efficiency at light loads.
(V
ripple and (V
frequency compared with skip mode.
Source-only applications.
IDLE
Either output > 115% of nominal level
Either output < 70% of nominal level,
(1/f
/ V
UVP is enabled 6144 clock cycles
LN
ON1 and ON2 are driven low
OSC
) times smaller no-load
COMMENTS
IDLE
ON1 or ON2 enabled
) after the output is enabled
(ON_ going high)
Output Voltage
CONDITION
T
/ V
V
J
CC
LN
> +160°C
)
UVLO
2
times higher
where V
equals 1%, and V
(V
Output Capacitor Selection section).
In discontinuous conduction (I
MAX8716/MAX8717/MAX8756/MAX8757 regulate the
valley of the output ripple, so the output voltage has a DC
regulation level higher than the error-comparator thresh-
old. For PFM operation (discontinuous conduction), the
output voltage is approximately defined by the following
equation:
where V
maximum switching frequency set by the internal oscil-
lator, f
the Idle Mode inductor current when pulse skipping.
DL_ tracks V
When ON_ is low, DL_ tracks V
When ON_ is high, DL_ is forced low as V
3.95V (typ) falling UVLO threshold. DL_ is forced high when
V
Normal operation.
When the overvoltage (OV) comparator trips, the faulted side
sets the OV latch, forcing PGOOD_ low and DL_ high. The
other controller is not affected.
The OV latch is cleared by cycling V
the respective ON_ pin.
When the undervoltage (UV) comparator trips, the faulted
side sets the UV latch, forcing PGOOD_ low and initiating the
soft-shutdown sequence by pulsing only DL_. DL_ goes high
after soft-shutdown. The other controller is not affected.
The UV latch is cleared by cycling V
the respective ON_ pin.
DL_ stays high after soft-shutdown is completed.
All circuitry is shut down.
Exited by POR or cycling ON1 and ON2.
DL1 and DL2 remain high.
V
RIPPLE
CC
OUT PWM
falls below 1V (typ).
SW
V
(
OUT PFM
NOM
NOM
is the actual switching frequency, and I
= R
)
(
=
CC
is the nominal output voltage, f
V
ESR
is the nominal output voltage, A
NOM
as V
)
=
x ΔI
CC
⎛
⎜
⎝
RIPPLE
V
1
NOM
−
rises from 0V to +5V.
A
INDUCTOR
COMMENT
SLOPE IN
+
is the output ripple voltage
1
2
CC
⎛
⎜
⎝
(
ƒ
V
V
ƒ
as V
OUT
IN
OSC
SW
CC
CC
−
as described in the
CC
V
below 1V or cycling
below 1V or cycling
⎞
⎟
⎠
NOM
< I
CC
falls.
I
IDLE
LOAD(SKIP)
)
falls below the
⎞
⎟ −
⎠
R
⎛
⎜
⎝
V
ESR
OSC
RIPPLE
2
SLOPE
IDLE
is the
), the
⎞
⎟
⎠
is