MAX1586A Datasheet, PDF (19/32 Pages) Maxim Integrated Products – High-Efficiency, Low-IQ PMICs with Dynamic Core for PDAs and Smart Phones

High-Efficiency, Low-I_Q PMICs with
Dynamic Core for PDAs and Smart Phones
enable the sleep LDOs, drive SLP low. When SLP is high,
the switching step-down converters are active. The output
voltage of the sleep LDOs is set to be the same as the
switching step-down converters as described in the
Setting the Output Voltages section. SLPIN is the input to
the V1 and V2 sleep LDOs and must connect to IN.
V3 (VCC_CORE) Step-Down
DC-DC Converter
V3 is a 1MHz current-mode step-down converter that
supplies loads up to 500mA. The V3 output voltage is set
by the I²C serial interface to between 0.7V and 1.475V in
25mV increments. The default voltage on power-up is
1.3V. See the Serial Interface section for details.
Forced PWM on REG3
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.
Linear Regulators (V4, V5, and V6)
V4 (VCC_PLL)
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 MAX1587, drive
ON4 high, or drive ON4 low for shutdown. On the
MAX1586, 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 (VCC_SRAM)
V5 is a linear regulator that provides a fixed 1.1V 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 V5 on the MAX1587, drive
ON5 high, or drive ON5 low for shutdown. On the
MAX1586, 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 (VCC_USIM—MAX1586 Only)
V6 is a linear regulator on the MAX1586 that supplies
loads up to 35mA. The V6 output voltage is pro-
grammed with the I²C serial interface to 0V, 1.8V, 2.5V,
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.
V7 Always-On Output (VCC_BATT)
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
Table 1. Quiescent Operating Current in Various States
OPERATING
POWER MODE
RUN
IDLE
SENSE
STANDBY
DESCRIPTION
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
SLEEP
PWR_EN controlled voltages (V3, V4, V5) are off. V1 and V2 on.
DEEP SLEEP All supplies off except V7. V7 biased from backup battery.
TYPICAL MAX1586/MAX1587
NO-LOAD OPERATING CURRENT
200µA MAX1587,
225µA MAX1586
60µA if V1 and V2 SLEEP LDOs on;
130µA if V1, V2 step-down DC-DCs enabled
5µA MAX1587 if IN > DBI threshold;
32µA MAX1586 if IN > DBI threshold;
4µA if IN < DBI threshold
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