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MAX8620YETD+ |MAX8620YETDMAXIMN/a134avaiµPMIC for Microprocessors or DSPs in Portable Equipment
MAX8620YETD+TMAXIM/PBFN/a1298avaiµPMIC for Microprocessors or DSPs in Portable Equipment


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MAX8620YETD+-MAX8620YETD+T
µPMIC for Microprocessors or DSPs in Portable Equipment
General Description
The MAX8620Y micro-power-management integrated
circuit (µPMIC) powers low-voltage microprocessors or
DSPs in portable devices. The µPMIC includes a high-
efficiency step-down DC-DC converter, two low-
dropout linear regulators (LDOs), a microprocessor
reset output, and power-on/off control logic. This device
maintains high efficiency at light loads with a low 115µA
supply current, and its miniature TDFN package makes
it ideal for portable devices.
The MAX8620Y’s step-down DC-DC converter utilizes a
proprietary 4MHz hysteretic-PWM control scheme that
allows for ultra-small external components. Internal syn-
chronous rectification improves efficiency and elimi-
nates the external Schottky diode that is required in
conventional step-down converters. The output voltage
is adjustable from 0.6V to 3.3V, with guaranteed output
current up to 500mA.
The MAX8620Y’s two LDOs offer low 45µVRMSoutput
noise and a low dropout of only 200mV at 200mA. Each
LDO delivers at least 300mA of continuous output cur-
rent. The output voltages are pin selectable from 1.8V
to 3.3V for flexibility.
A microprocessor reset output (RESET) monitors OUT1
and warns the system of impending power loss allow-
ing safe shutdown. RESETasserts during power-up,
power-down, shutdown, and fault conditions where
VOUT1is below its regulation voltage.
Applications

Cellular Handsets
Smart Phones/PDA Phones
PDAs
Wireless LAN
Microprocessor and DSP Solutions including
MSM™, XScale™, ARM™,and OMAP™
Features
Three Regulators and a Reset in One PackageHigh-Efficiency Step-Down Converter
Up to 4MHz Fixed Switching Frequency
500mA Guaranteed Output Current
0.6V to 3.3V Adjustable Output Voltage
±2% Initial Accuracy
Fast Voltage-Positioning Transient Response
Internal Synchronous Rectifier
Two 300mA LDO Regulators
200mV Dropout at 200mA Load
Low 45µVRMSOutput Noise
3% Accuracy over Line, Load, and Temperature
Overcurrent Protection
Nine Pin-Selectable Output-Voltage Settings
30ms (min) RESETOutput Flag2.7V to 5.5V Input115µA (typ) Supply Current at No LoadThermal-Overload ProtectionTiny 3mm x 3mm x 0.8mm TDFN Package
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
Ordering Information

MAX8620Y
OUT1
VIN
VLOGIC
100kΩ
RESET
OUT2
GND
IN2
HF_PWR
PWR_ON
SEL1
RESET
SEL2
EN2
IN1
1.80V, 2.60V, 2.80V, 2.85V,
3.00V, OR 3.30V*
300mA
1.80V, 2.50V, 2.60V,
2.85V, OR 3.00V*
300mA
OUT3
0.6V TO 3.3V
500mA
*USE SEL1 AND SEL2 TO SET VOUT1 AND VOUT2
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK

MAX8620YETD-40°C to +85°C14 TDFN-EP
(T1433-2)AAB
Typical Operating Circuit

19-3564; Rev 0; 1/05
MSM is a trademark of QUALCOMM, Inc.
XScale is a trademark of Intel Corp.
ARM is a trademark of ARMLimited.
OMAP is a trademark of Texas Instruments, Inc.
EVALUATION KIT
AVAILABLE
Pin Configuration appears at end of data sheet.
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN1= VIN2= +3.7V, CIN= 10µF, CBP= 0.01µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
(Note 1)
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.
IN1, IN2, PWR_ON, RESET, EN2, SEL1, SEL2,
HF_PWR, FB, BP to GND..................................-0.3V to +6.0V
OUT1, OUT2 to GND.................................-0.3V to (VIN1+ 0.3V)
LX Current......................................................................1.5ARMS
Continuous Power Dissipation (TA= +70°C)
14-Pin TDFN (derate 18.2mW/°C above +70°C).......1454mW
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply Voltage RangeVIN12.75.5V
Shutdown Supply CurrentISHDNVIN1 = VIN2 = 4.2V, PWR_ON = HF_PWR =
GND5.510µA
All outputs enabled, no load115140
Supply CurrentIIN1 + IIN2VOUT1 = VOUT3 = 1.8V, IOUT1 = IOUT3 =
500µA, OUT2 disabled430µA
UNDERVOLTAGE LOCKOUT

VIN1 = VIN2 rising2.702.853.05UVLO ThresholdVUVLOVIN1 = VIN2 falling2.35V
THERMAL PROTECTION

Thermal-Shutdown ThresholdTemperature rising+160°C
Thermal-Shutdown Hysteresis15°C
REFERENCE (BP)

Reference Bypass Output
VoltageVBP0 ≤ IBP ≤ 1µA1.2311.2501.269V
LOGIC AND CONTROL INPUTS (PWR_ON, HF_PWR, EN2)

PWR_ON, HF_PWR, EN2 Input
Low VoltageVILVIN1 = VIN2 = 2.7V to 4.2V (Note 2)0.4V
PWR_ON, HF_PWR, EN2 Input
High VoltageVIHVIN1 = VIN2 = 2.7V to 4.2V (Note 2)1.44V
Input Bias CurrentIINBVPWR_ON = VHF_PWR = VEN2 = 0V or 5.5V-1+1µA
HF_PWR TimertHFFrom the rising edge of HF_PWR until the
one-shot timer expires (Figure 4)1.051.311.46s
LINEAR REGULATORS (OUT1, OUT2)

0°C to +85°C-1.3+1.8ILOAD = 1mA, 3.7V ≤ VIN
≤ 5.5V-40°C to +85°C-1.5+1.8
1mA ≤ ILOAD ≤ 300mA-1.2
OUT1, OUT2 Output-Voltage
Accuracy
VOUT1,
VOUT2
ILOAD = 150mA0
OUT1, OUT2 Output CurrentIOUT_300mA
OUT1, OUT2 Output Current LimitILIM_VOUT_ = 0V310550940mA
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

OUT1, OUT2 Power-Supply
Rejection Ratio
f = 10Hz to 10kHz, COUT_ = 4.7µF,
ILOAD_ = 30mA60dB
f = 100Hz to 100kHz, COUT_ = 4.7µF,
ILOAD_ = 30mA45
Output Noise Voltage
f = 100Hz to 100kHz, COUT_ = 4.7µF,
ILOAD_ = 30mA, CBP open100
µVRMS
STEP-DOWN CONVERTER (OUT3)

Output Voltage RangeVOUT30.63.3V
FB Threshold VoltageVTHVFB falling0.6V
FB Threshold Line RegulationVIN1 = VIN2 = 2.7V to 5.5V (Note 2)0.08%/V
TA = +25°C-2+2FB Threshold Voltage Accuracy
(Falling) (% of VTH)IOUT3 = 0mATA = -40°C to +85°C-3+3%
FB Threshold Voltage Hysteresis
(% of VTH)VHYS2%
OUT3 disabled10FB Bias CurrentIFBVFB = 0.5V10µA
ILIM3PpFET switch6759501200Current LimitILIM3NnFET rectifier87510001200mA
RONPpFET switch, ILX = -200mA0.651.5On-ResistanceRONNnFET rectifier, ILX = +200mA0.350.8Ω
Rectifier-Off Current ThresholdILXOFF3060mA
tON107Minimum On- and Off-TimestOFF95ns
OPEN-DRAIN, ACTIVE-LOW RESET OUTPUT (RESET)

RESET Output-Voltage LowVOLISINK = 500µA0.3V
RESET Output Leakage CurrentVRESET = 5.5V100nA
RESET Threshold VoltageVTHRPercent of the OUT1 regulation voltage
(Note 4)848790%
RESET Timeout PeriodtRPFigure 43060ms
LDO OUTPUT-VOLTAGE SELECT INPUTS (SEL1, SEL2)

SEL_ Input Low Threshold1V
SEL_ Input High ThresholdVIN_ - 0.2VV
SEL_ Input Bias CurrentVIN1 = VIN2 = 4.2V, VSEL1 = 0V or VIN1,
VSEL2 = 0V or VIN1±0.1µA
ELECTRICAL CHARACTERISTICS (continued)

(VIN1= VIN2= +3.7V, CIN= 10µF, CBP= 0.01µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
(Note 1)
Note 1:
Specifications are 100% production tested at TA= +25°C. Maximum and minimum limits over temperature are guaranteed
by design and characterization.
Note 2:
After startup.
Note 3:
Guaranteed by design.
Note 4:
RESETasserts low when VOUT1drops below the specified percent of the OUT1 regulation voltage.
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
Typical Operating Characteristics

(VIN1= VIN2 = 3.7V, PWR_ON = IN1, L = 2.2µH (LQH31CN2R2M53), CFF= 150pF, VOUT1= VOUT2= 2.6V, VOUT3= 1.867V (R1 =
150kΩ, R2 = 75kΩ), CIN = 10µF, CBP = 0.01µF, COUT1 = COUT2 = 4.7µF, COUT3 = 2.2µF, RESETpulled up with 100kΩto OUT1,
TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT

MAX8620Y toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
L = 4.7μH
L = 2.2μH
L = 1.0μH
INPUT QUIESCENT CURRENT
vs. INPUT VOLTAGE

MAX8620Y toc02
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
SWITCHING FREQUENCY vs. LOAD CURRENT
SWITCHING FREQUENCY (MHz)
MAX8620Y toc03
LOAD CURRENT (mA)
L = 4.7μHL = 2.2μH
L = 1.0μH
EFFICIENCY vs. OUTPUT VOLTAGE

OUTPUT VOLTAGE (V)
EFFICIENCY (%)
MAX8620Y toc04L = 4.7μH
L = 2.2μH
L = 1.0μH
LIGHT-LOAD SWITCHING WAVEFORMS

MAX8620Y toc05
200ns/div
VOUT
AC-COUPLED
2V/div
20mV/div
100mA/div
VLX
HEAVY-LOAD SWITCHING WAVEFORMS

MAX8620Y toc06
200ns/div
VOUT
AC-COUPLED
2V/div
20mV/div
200mA/div
VLX
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
Typical Operating Characteristics (continued)

(VIN1= VIN2 = 3.7V, PWR_ON = IN1, L = 2.2µH (LQH31CN2R2M53), CFF= 150pF, VOUT1= VOUT2= 2.6V, VOUT3= 1.867V (R1 =
150kΩ, R2 = 75kΩ), CIN = 10µF, CBP = 0.01µF, COUT1 = COUT2 = 4.7µF, COUT3 = 2.2µF, RESETpulled up with 100kΩto OUT1,
TA = +25°C, unless otherwise noted.)
LOAD TRANSIENT (50mA TO 300mA)

MAX8620Y toc07
2μs/div
ILOAD
VOUT3
AC-COUPLED50mV/div
200mA/div
300mA
50mA
200mA/div
POWER-UP WAVEFORMS

MAX8620Y toc08
40μs/div
VOUT3
VOUT1
VOUT2
VIN
2V/div
1V/div
1V/div
1V/div
PWR_ON STARTUP/SHUTDOWN WAVEFORMS

MAX8620Y toc09
100μs/div
VOUT3
VOUT1
VOUT2
VPWR_ON2V/div
1V/div
1V/div
1V/div
RESET WAVEFORMS

MAX8620Y toc10
10ms/div
VOUT1
VPWR_ON
2V/div
1V/div
1V/div
VRESET
OUT2 SHUTDOWN WAVEFORMS

MAX8620Y toc11
200μs/div
VOUT2
VEN21V/div
1V/div
HF_PWR STARTUP WAVEFORMS

MAX8620Y toc12
10ms/div
VOUT1
VHF_PWR
1V/div
2V/div
1V/div
VRESET
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
OUT1/OUT2 VOLTAGE vs. INPUT VOLTAGE

MAX8620Y toc13
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
ILOAD = 0mA
ILOAD = 300mA
DROPOUT VOLTAGE vs. LOAD CURRENT

LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
MAX8620Y toc14
VOUT_ = 3V
OUT1/OUT2 LOAD REGULATION vs. LOAD CURRENT

MAX8620Y toc15
LOAD CURRENT (mA)
LOAD REGULATION (%)
OUT1/OUT2 POWER-SUPPLY
RIPPLE REJECTION vs. FREQUENCY
MAX8620Y toc16
FREQUENCY (kHz)
POWER-SUPPLY RIPPLE REJECTION (dB)
Typical Operating Characteristics (continued)
(VIN1= VIN2 = 3.7V, PWR_ON = IN1, L = 2.2µH (LQH31CN2R2M53), CFF= 150pF, VOUT1= VOUT2= 2.6V, VOUT3= 1.867V (R1 =
150kΩ, R2 = 75kΩ), CIN = 10µF, CBP = 0.01µF, COUT1 = COUT2 = 4.7µF, COUT3 = 2.2µF, RESETpulled up with 100kΩto OUT1,
TA = +25°C, unless otherwise noted.)
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
Pin Description
PINNAMEFUNCTION
SEL1LDO Output-Voltage Select Input 1. SEL1 and SEL2 set the OUT1 and OUT2 voltages to one of nine
combinations (Table 1).SEL2LDO Output-Voltage Select Input 2. SEL1 and SEL2 set the OUT1 and OUT2 voltages to one of nine
combinations (Table 1).EN2
OUT2 Enable Input. Drive EN2 low to enable OUT2. Drive EN2 high to disable OUT2. If the MAX8620Y
is placed into shutdown (PWR_ON = HF_PWR = low), OUT2 does not power regardless of the status
of EN2 (Table 2, Figure 4).RESET
Open-Drain, Active-Low Reset Output. RESET asserts low when VOUT1 drops below 87% (typ) of
regulation. RESET remains asserted for tRP after VOUT1 rises above 87% (typ) of regulation. RESET
also asserts when OUT1 is disabled (Figure 4). RESET deasserts if OUT1 is enabled and VOUT1 is
above 87% of regulation after tRP.
5BPReference Bypass Capacitor Node. Bypass BP with a 0.01µF capacitor to GND. BP is high
impedance when the MAX8620Y is disabled (PWR_ON = HF_PWR = low).HF_PWRHands-Free Enable Input. Drive HF_PWR high or apply a pulse to enable the MAX8620Y. Power is
enabled for 1.31s (typ) following a rising edge at HF_PWR (Table 2, Figure 4).PWR_ON
Power-Enable Input. Drive PWR_ON high to enable the MAX8620Y (Table 2, Figure 4). Drive PWR_ON
low to enter shutdown mode. In shutdown, the LX node is high impedance and both LDOs are
disabled (depending on the state of HF_PWR).
8FB
Step-Down Converter Output-Voltage Feedback Input. VFB regulates to 0.6V (typ). Connect FB to the
center of an external resistor-divider between LX and GND to set VOUT3 between 0.6V and 3.3V (see
the Setting the Step-Down Output Voltage (OUT3) section).GNDGround. Connect GND to the exposed pad.LXInductor Connection. LX is internally connected to the drain of the internal p-channel power MOSFET
and the drain of the n-channel synchronous rectifier. LX is high impedance when OUT3 is disabled.IN2Power Input 2. Connect IN2 to IN1 as close to the device as possible.IN1Power Input 1. Connect IN1 to IN2 as close to the device as possible. Bypass IN1 to GND with a 10µF
ceramic capacitor, as close to the device as possible.OUT1300mA LDO Output 1. Bypass OUT1 to GND with a 4.7µF ceramic capacitor for 300mA applications,
or a 2.2µF ceramic capacitor for 150mA applications. OUT1 is high impedance when disabled.OUT2300mA LDO Output 2. Bypass OUT2 to GND with a 4.7µF ceramic capacitor for 300mA applications,
or a 2.2µF ceramic capacitor for 150mA applications. OUT2 is high impedance when disabled.EPExposed Pad. Connect EP to GND.
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment
Detailed Description

The MAX8620Y µPMIC is designed to power low-core-
voltage microprocessors or DSPs in portable devices.
The µPMIC contains a fixed-frequency, high-efficiency
step-down converter; two low-dropout regulators
(LDOs); a 30ms (min) reset timer; and power-on/off
control logic (Figure1).
Step-Down DC-DC Control Scheme

The MAX8620Y step-down converter is optimized for
high-efficiency voltage conversion over a wide load
range while maintaining excellent transient response,
minimizing external component size, and minimizing
output voltage ripple. The DC-DC converter (OUT3)
also features an optimized on-resistance internal
MOSFET switch and synchronous rectifier to maximize
efficiency. The MAX8620Y utilizes a proprietary hys-
teretic-PWM control scheme that switches with nearly
fixed frequency up to 4MHz, allowing for ultra-small
external components. The step-down converter output
current is guaranteed up to 500mA.
When the step-down converter output voltage falls
below the regulation threshold, the error comparator
begins a switching cycle by turning the high-side pFET
switch on. This switch remains on until the minimum on-
time (tON) expires and the output voltage is in regula-
tion or the current-limit threshold (ILIM3P) is exceeded.
Once off, the high-side switch remains off until the mini-
mum off-time (tOFF) expires and the output voltage
again falls below the regulation threshold. During this
off period, the low-side synchronous rectifier turns on
and remains on until either the high-side switch turns
on or the inductor current reduces to the rectifier-off
current threshold (ILXOFF= 30mA (typ)). The internal
synchronous rectifier eliminates the need for an exter-
nal Schottky diode.
0.6V
STEP-DOWN
CONVERTER
CONTROL
pFET
nFET
LDO1
CONTROL
LDO2
CONTROL
OUT1
OUT2
REFERENCE
IN1
GND
OUTPUT-
VOLTAGE
SELECT
UVLO
CONTROL
LOGIC
ONE-
SHOT
TIMER
PWR_ON
HF_PWR
SEL1
SEL2
RESET
EN2BP
RESET
ENABLE
VIN
CIN
COUT3
COUT1
RPU
CBP
COUT2
CFF
OUT3
GND
OUT1
OUT2
EN2
RESET
IN2IN1
MAX8620Y
Voltage-Positioning Load Regulation
As seen in Figure2, the MAX8620Y uses a unique step-
down converter feedback network. By taking feedback
from the LX node through R1, the usual phase lag due
to the output capacitor is removed, making the loop
exceedingly stable and allowing the use of a very small
ceramic output capacitor. This configuration causes the
output voltage to shift by the inductor series resistance
multiplied by the load current. This output-voltage shift
is known as voltage-positioning load regulation.
Voltage-positioning load regulation greatly reduces
overshoot during load transients, which effectively
halves the peak-to-peak output-voltage excursions
compared to traditional step-down converters. See the
Load-Transient Response graph in the Typical
Operating Characteristicssection.
Two low-dropout, low-quiescent-current, high-accuracy
linear regulators supply loads up to 300mA each. The
LDO output voltages are set using SEL1 and SEL2 (see
Table1). As shown in Figure3, the LDOs include an
internal reference, error amplifiers, p-channel pass tran-
sistors, internal-programmable voltage-dividers, and an
OUT1 power-good comparator. Each error amplifier
compares the reference voltage to a feedback voltage
and amplifies the difference. If the feedback voltage is
lower than the reference voltage, the pass-transistor
gate is pulled lower, allowing more current to pass to
the outputs and increasing the output voltage. If the
feedback voltage is too high, the pass-transistor gate is
pulled up, allowing less current to pass to the output.
MAX8620Y
µPMIC for Microprocessors or DSPs
in Portable Equipment

OUT1
OUT2
GND
IN1
HF_PWR
2.6V
300mA
100kΩ
PWR_ON
SEL1
RESET
SEL2
EN2
RESET IN
OUT3,
500mA
COUT2
4.7μF
COUT1
4.7μF
COUT3
2.2μF
CIN
10μF
CBP
0.01μF
CFF
150pF
DSPμP
I/O
ANALOG
ON/OFF
CORE
150kΩ
2.2μH
Li+
CELL
2.6V
300mA
75kΩ
POWER-ON
KEY
VBATT
1MΩ
IN2
MAX8620Y
SEL1SEL2OUT1OUT2

IN1IN13.00V2.50V
IN1OPEN2.85V2.85V
IN1GND3.00V3.00V
OPENIN13.30V2.50V
OPENOPEN2.80V2.60V
OPENGND3.30V1.80V
GNDIN12.85V2.60V
GNDOPEN2.60V2.60V
GNDGND1.80V2.60V
Figure2. Typical MAX8620Y DSP or µP Application
Table1. MAX8620Y Output-Voltage
Selection
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