MAX1587AETL-T Maxim Integrated Products, MAX1587AETL-T Datasheet - Page 19

• Manufacturer Part Number: MAX1587AETL-T
• Description: Other Power Management PMICs w/Dynamic Core for PDAs
• Manufacturer: Maxim Integrated Products

V3 is a 1MHz current-mode step-down converter. The
MAX1586A, MAX1586B, and MAX1587A supply loads
up to 500mA from V3 while the MAX1586C and
MAX1587C supply loads up to 1A.
The V3 output is set by the I
between 0.7V and 1.475V in 25mV increments. The
default output voltage on power-up and after a reset is
1.3V. See the Serial Interface section for programming
details. See the Applications Information for instructions
on how to increase the V3 output voltage.
Under moderate to heavy loading, the V3 always operates
in a low-noise PWM mode with constant frequency and
modulated pulse width. Switching harmonics generated by
fixed-frequency operation are consistent and easily filtered.
With light loads (< 30mA) and PWM3 low, V3 operates
in an enhanced-efficiency Idle Mode during which the
converter switches only as needed to service the load.
With PWM3 high, V3 operates in low-noise forced-PWM
mode under all load conditions.
V4 is a linear regulator that provides a fixed 1.3V output
and supplies loads up to 35mA. The power input for the
V4 and V5 linear regulators is IN45, which is typically
connected to V2. To enable V4 on the MAX1586, drive
ON4 high, or drive ON4 low for shutdown. On the
MAX1587, the enable pins for V4 and V5 are combined.
Drive ON45 high to enable V4 and V5, or drive ON45 low
for shutdown. V4 is intended to connect to VCC_PLL.
V5 is a linear regulator that provides a fixed 1.1V output
and supplies loads up to 35mA. The power input for the
Table 1. Quiescent Operating Current in Various States
POWER MODE
OPERATING
DEEP SLEEP
STANDBY
SENSE
SLEEP
RUN
IDLE
Linear Regulators (V4, V5, and V6)
Dynamic Core for PDAs and Smart Phones
All supplies on and running
All supplies on and running, peripherals on
All supplies on, minimal loading, peripherals monitored
All supplies on, minimal loading, peripherals not monitored
P W R_E N contr ol l ed vol tag es ( V 3, V 4, V 5) ar e off. V 1 and V 2 on.
All supplies off except V7. V7 biased from backup battery.
______________________________________________________________________________________
V3 (VCC_CORE) Step-Down
High-Efficiency, Low-I
Forced PWM on REG3
2
C serial interface to
DC-DC Converter
V5 (VCC_SRAM)
DESCRIPTION
V4 (VCC_PLL)
V4 and V5 linear regulators is IN45, which is typically
connected to V2. To enable V5 on the MAX1586, drive
ON5 high, or drive ON5 low for shutdown. On the
MAX1587, the enable pins for V4 and V5 are combined.
Drive ON45 high to enable V4 and V5, or drive ON45 low
for shutdown. V5 is intended to connect to VCC_SRAM.
V6 is a linear regulator on the MAX1586 that supplies
loads up to 35mA. The V6 output voltage is pro-
grammed with the I
or 3.0V. The power-up default for V6 is 0V. See the
Serial Interface section for details on changing the volt-
age. The power input for the V6 linear regulator is IN6,
which is typically connected to V1. To enable V6, drive
ON6 high, or drive ON6 low for shutdown. V6 is intend-
ed to connect to VCC_USIM.
The V7 output is always active if V1 is enabled and in
regulation or if backup power is present. When ON1 is
high and V1 is in regulation, V7 is sourced from V1 by
an internal MOSFET switch. When ON1 is low or V1 is
out of regulation, V7 is sourced from BKBT by a second
on-chip MOSFET. V7 can supply loads up to 30mA. V7
is intended to connect to VCC_BATT on Intel CPUs.
Due to variations in system implementation, BKBT and
V7 can be utilized in different ways. See the Backup-
Battery and V7 Configurations section for information on
how to use BKBT and V7.
The MAX1586/MAX1587 are designed for optimum effi-
ciency and minimum operating current for all typical
operating modes, including sleep and deep sleep.
These states are outlined in Table 1.
V7 Always-On Output (VCC_BATT)
200µA MAX1587,
225µA MAX1586
60µA if V1 and V2 SLEEP LDOs on;
130µA if V1, V2 step-down DC-DCs enabled
5µA MAX1587 if V
32µA MAX1586 if V
4µA if V
Quiescent Operating Current
NO-LOAD OPERATING CURRENT
2
IN
C serial interface to 0V, 1.8V, 2.5V,
TYPICAL MAX1586/MAX1587
V6 (VCC_USIM—MAX1586 Only)
< DBI threshold
Q
PMICs with
IN
IN
> DBI threshold;
> DBI threshold;
in Various States
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