19-3564; Rev 0; 1/05
KIT
ATION
EVALU
BLE
AVAILA
µPMIC for Microprocessors or DSPs
in Portable Equipment
General Description
Features
♦
Three Regulators and a Reset in One Package
♦
High-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 45µV
RMS
Output Noise
3% Accuracy over Line, Load, and Temperature
Overcurrent Protection
Nine Pin-Selectable Output-Voltage Settings
♦
30ms (min)
RESET
Output Flag
♦
2.7V to 5.5V Input
♦
115µA (typ) Supply Current at No Load
♦
Thermal-Overload Protection
♦
Tiny 3mm x 3mm x 0.8mm TDFN Package
MAX8620Y
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 45µV
RMS
output
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.
RESET
asserts during power-up,
power-down, shutdown, and fault conditions where
V
OUT1
is below its regulation voltage.
Ordering Information
PART
MAX8620YETD
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
14 TDFN-EP
(T1433-2)
TOP
MARK
AAB
Applications
Cellular Handsets
Smart Phones/PDA Phones
PDAs
Wireless LAN
Microprocessor and DSP Solutions including
MSM™, XScale™, ARM™, and OMAP™
V
IN
Typical Operating Circuit
IN2
IN1
OUT2
OUT1
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
V
LOGIC
100kΩ
EN2
HF_PWR
PWR_ON
RESET
LX
RESET
OUT3
0.6V TO 3.3V
500mA
MAX8620Y
BP
Pin Configuration appears at end of data sheet.
MSM is a trademark of QUALCOMM, Inc.
XScale is a trademark of Intel Corp.
ARM is a trademark of ARM Limited.
OMAP is a trademark of Texas Instruments, Inc.
SEL1
SEL2
GND
FB
*USE SEL1 AND SEL2 TO SET V
OUT1
AND V
OUT2
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
µPMIC for Microprocessors or DSPs
in Portable Equipment
MAX8620Y
ABSOLUTE MAXIMUM RATINGS
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 (V
IN1
+ 0.3V)
LX Current ......................................................................1.5A
RMS
Continuous Power Dissipation (T
A
= +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
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.
ELECTRICAL CHARACTERISTICS
(V
IN1
= V
IN2
= +3.7V, C
IN
= 10µF, C
BP
= 0.01µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
Supply Voltage Range
Shutdown Supply Current
SYMBOL
V
IN1
I
SHDN
V
IN1
= V
IN2
= 4.2V, PWR_ON = HF_PWR =
GND
All outputs enabled, no load
Supply Current
UNDERVOLTAGE LOCKOUT
UVLO Threshold
THERMAL PROTECTION
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
REFERENCE (BP)
Reference Bypass Output
Voltage
PWR_ON, HF_PWR,
EN2
Input
Low Voltage
PWR_ON, HF_PWR,
EN2
Input
High Voltage
Input Bias Current
HF_PWR Timer
LINEAR REGULATORS (OUT1, OUT2)
OUT1, OUT2 Output-Voltage
Accuracy
OUT1, OUT2 Output Current
OUT1, OUT2 Output Current Limit
OUT1, OUT2 Dropout Voltage
V
OUT1
,
V
OUT2
I
OUT_
I
LIM_
V
DO
V
OUT_
= 0V
I
LOAD
= 200mA, T
A
= +85°C (Note 3)
I
LOAD
= 1mA, 3.7V
≤
V
IN
≤
5.5V
1mA
≤
I
LOAD
≤
300mA
I
LOAD
= 150mA
300
310
550
200
940
380
0°C to +85°C
-40°C to +85°C
-1.3
-1.5
-1.2
0
mA
mA
mV
+1.8
+1.8
%
V
BP
0
≤
I
BP
≤
1µA
1.231
1.250
1.269
V
Temperature rising
+160
15
°C
°C
V
UVLO
V
IN1
= V
IN2
rising
V
IN1
= V
IN2
falling
2.70
2.85
2.35
3.05
V
I
IN1
+ I
IN2
V
OUT1
= V
OUT3
= 1.8V, I
OUT1
= I
OUT3
=
500µA, OUT2 disabled
CONDITIONS
MIN
2.7
5.5
115
430
TYP
MAX
5.5
10
140
µA
UNITS
V
µA
LOGIC AND CONTROL INPUTS (PWR_ON, HF_PWR,
EN2)
V
IL
V
IH
I
INB
t
HF
V
IN1
= V
IN2
= 2.7V to 4.2V (Note 2)
V
IN1
= V
IN2
= 2.7V to 4.2V (Note 2)
V
PWR_ON
= V
HF_PWR
= V
EN2
= 0V or 5.5V
From the rising edge of HF_PWR until the
one-shot timer expires (Figure 4)
1.44
-1
1.05
1.31
+1
1.46
0.4
V
V
µA
s
2
_______________________________________________________________________________________
µPMIC for Microprocessors or DSPs
in Portable Equipment
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
= V
IN2
= +3.7V, C
IN
= 10µF, C
BP
= 0.01µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
OUT1, OUT2 Power-Supply
Rejection Ratio
SYMBOL
CONDITIONS
f = 10Hz to 10kHz, C
OUT_
= 4.7µF,
I
LOAD_
= 30mA
f = 100Hz to 100kHz, C
OUT_
= 4.7µF,
I
LOAD_
= 30mA
f = 100Hz to 100kHz, C
OUT_
= 4.7µF,
I
LOAD_
= 30mA, C
BP
open
STEP-DOWN CONVERTER (OUT3)
Output Voltage Range
FB Threshold Voltage
FB Threshold Line Regulation
FB Threshold Voltage Accuracy
(Falling) (% of V
TH
)
FB Threshold Voltage Hysteresis
(% of V
TH
)
FB Bias Current
Current Limit
On-Resistance
Rectifier-Off Current Threshold
Minimum On- and Off-Times
V
HYS
I
FB
I
LIM3P
I
LIM3N
R
ONP
R
ONN
I
LXOFF
t
ON
t
OFF
V
OL
I
SINK
= 500µA
V
RESET
= 5.5V
V
THR
t
RP
Percent of the OUT1 regulation voltage
(Note 4)
Figure 4
84
30
87
60
1
V
IN_
- 0.2V
V
IN1
= V
IN2
= 4.2V, V
SEL1
= 0V or V
IN1
,
V
SEL2
= 0V or V
IN1
±0.1
OUT3 disabled
V
FB
= 0.5V
pFET switch
nFET rectifier
pFET switch, I
LX
= -200mA
nFET rectifier, I
LX
= +200mA
675
875
V
OUT3
V
TH
V
FB
falling
V
IN1
= V
IN2
= 2.7V to 5.5V (Note 2)
I
OUT3
= 0mA
T
A
= +25°C
T
A
= -40°C to +85°C
-2
-3
2
10
10
950
1000
0.65
0.35
30
107
95
0.3
100
90
1200
1200
1.5
0.8
60
0.6
0.6
0.08
+2
+3
3.3
V
V
%/V
%
%
µA
mA
Ω
mA
ns
MIN
TYP
60
45
µV
RMS
100
MAX
UNITS
dB
MAX8620Y
Output Noise Voltage
OPEN-DRAIN, ACTIVE-LOW RESET OUTPUT (RESET)
RESET
Output-Voltage Low
RESET
Output Leakage Current
RESET
Threshold Voltage
RESET
Timeout Period
SEL_ Input Low Threshold
SEL_ Input High Threshold
SEL_ Input Bias Current
V
nA
%
ms
V
V
µA
LDO OUTPUT-VOLTAGE SELECT INPUTS (SEL1, SEL2)
Note 1:
Specifications are 100% production tested at T
A
= +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:
RESET
asserts low when V
OUT1
drops below the specified percent of the OUT1 regulation voltage.
_______________________________________________________________________________________
3
µPMIC for Microprocessors or DSPs
in Portable Equipment
MAX8620Y
Typical Operating Characteristics
(V
IN1
= V
IN2
= 3.7V, PWR_ON = IN1, L = 2.2µH (LQH31CN2R2M53), C
FF
= 150pF, V
OUT1
= V
OUT2
= 2.6V, V
OUT3
= 1.867V (R1 =
150kΩ, R2 = 75kΩ), C
IN
= 10µF, C
BP
= 0.01µF, C
OUT1
= C
OUT2
= 4.7µF, C
OUT3
= 2.2µF,
RESET
pulled up with 100kΩ to OUT1,
T
A
= +25°C, unless otherwise noted.)
INPUT QUIESCENT CURRENT
EFFICIENCY vs. LOAD CURRENT
vs. INPUT VOLTAGE
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
L = 2.2µH
L = 1.0µH
L = 4.7µH
MAX8620Y toc01
160
QUIESCENT CURRENT (µA)
140
120
100
80
60
40
20
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
SWITCHING FREQUENCY vs. LOAD CURRENT
MAX8620Y toc03
EFFICIENCY vs. OUTPUT VOLTAGE
95
90
EFFICIENCY (%)
85
80
75
70
65
L = 2.2µH
L = 1.0µH
MAX8620Y toc04
MAX8620Y toc06
10
L = 1.0µH
SWITCHING FREQUENCY (MHz)
100
L = 4.7µH
1
L = 4.7µH
L = 2.2µH
0.1
0
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
60
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
OUTPUT VOLTAGE (V)
LIGHT-LOAD SWITCHING WAVEFORMS
MAX8620Y toc05
HEAVY-LOAD SWITCHING WAVEFORMS
V
LX
2V/div
V
LX
2V/div
V
OUT
AC-COUPLED
20mV/div
V
OUT
AC-COUPLED
I
L
MAX8620Y toc02
100
180
20mV/div
200mA/div
I
L
100mA/div
200ns/div
200ns/div
4
_______________________________________________________________________________________
µPMIC for Microprocessors or DSPs
in Portable Equipment
Typical Operating Characteristics (continued)
(V
IN1
= V
IN2
= 3.7V, PWR_ON = IN1, L = 2.2µH (LQH31CN2R2M53), C
FF
= 150pF, V
OUT1
= V
OUT2
= 2.6V, V
OUT3
= 1.867V (R1 =
150kΩ, R2 = 75kΩ), C
IN
= 10µF, C
BP
= 0.01µF, C
OUT1
= C
OUT2
= 4.7µF, C
OUT3
= 2.2µF,
RESET
pulled up with 100kΩ to OUT1,
T
A
= +25°C, unless otherwise noted.)
LOAD TRANSIENT (50mA TO 300mA)
MAX8620Y toc07
MAX8620Y
POWER-UP WAVEFORMS
MAX8620Y toc08
V
OUT3
AC-COUPLED
2V/div
50mV/div
V
IN
200mA/div
V
OUT3
1V/div
1V/div
I
L
300mA
200mA/div
50mA
V
OUT1
1V/div
I
LOAD
V
OUT2
2µs/div
40µs/div
PWR_ON STARTUP/SHUTDOWN WAVEFORMS
MAX8620Y toc09
RESET WAVEFORMS
MAX8620Y toc10
V
PWR_ON
2V/div
2V/div
V
PWR_ON
V
OUT3
1V/div
V
RESET
V
OUT1
1V/div
V
OUT1
V
OUT2
100µs/div
1V/div
10ms/div
1V/div
1V/div
OUT2 SHUTDOWN WAVEFORMS
MAX8620Y toc11
HF_PWR STARTUP WAVEFORMS
MAX8620Y toc12
2V/div
V
HF_PWR
V
EN2
1V/div
1V/div
V
OUT1
1V/div
1V/div
V
OUT2
V
RESET
200µs/div
10ms/div
_______________________________________________________________________________________
5
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