19-0587; Rev 3; 6/10
KIT
ATION
EVALU
BLE
AVAILA
High-Efficiency, Low-I
Q
, PMICs with Dynamic
Voltage Management for Mobile Applications
General Description
The MAX8660/MAX8661 power management ICs
(PMICs) power applications processors (APs) in smart
cellular phones, PDAs, Internet appliances, and other
portable devices.
Four step-down DC-DC outputs, three linear regulators,
and an 8th always-on LDO are integrated with power-
management functions. Two dynamically controlled DC-
DC outputs power the processor core and internal mem-
ory. Two other DC-DC converters power I/O, memory,
and other peripherals. Additional functions include on/off
control for outputs, low-battery detection, reset output,
and a 2-wire I
2
C serial interface. The MAX8661 functions
the same as the MAX8660, except it lacks the REG1
step-down regulator and the REG7 linear regulator.
All step-down DC-to-DC outputs use fast 2MHz PWM
switching and tiny external components. They automati-
cally switch from PWM to high-efficiency, light-load
operation to reduce operating current and extend bat-
tery life. In addition, a forced-PWM option allows low-
noise operation at all loads. Overvoltage lockout pro-
tects the device against inputs up to 7.5V.
Features
o
Optimized for Marvell’s PXA300 and Armada 100
Family of Processors
o
Protected to 7.5V—Shutdown Above 6.3V
o
Four Synchronous Step-Down Converters
REG1, REG2, REG3, REG4
o
Four LDO Regulators
REG5, REG6, REG7, REG8
o
2MHz Switching Allows Small Components
o
Low, 20µA Deep-Sleep Current
o
Low-Battery Monitor and Reset Output
MAX8660/MAX8660A/MAX8660B/MAX8661
Ordering Information
PART
PIN-PACKAGE
OPTIONS
V1: 3.3V, 3.0V, 2.85V
V2: 3.3V, 2.5V, 1.8V
V3: 1.4V (default)
V4: 1.4V (default)
V1: 3.3V, 3.0V, 2.85V
V2: 3.3V, 2.5V, 1.8V
V3: 1.4V (default)
V4: 1.4V (default)
MAX8660ETL+
40 Thin QFN
Applications
PDAs, Palmtops, and Wireless Handhelds
Smart Cell Phones
Personal Media Players
Portable GPS Navigation
Digital Cameras
MAX8660ETL/V+
40 Thin QFN
Note:
All devices are specified over the -40°C to 85°C operating
temperature range.
+Denotes
lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Ordering Information continued at end of data sheet.
Pin Configuration
RAMP
RSO
PG3
LBR
PV3
EN5
30 29 28 27 26 25 24 23 22 21
EN34 31
EN2 32
SRAD 33
PG1 (GND) 34
LX1 (N.C.) 35
PV1 (PV) 36
EN1 (GND) 37
V1 (GND) 38
SET1 (GND) 39
V4 40
1
IN5
2
V5
3
PV4
4
LX4
5
PG4
6
SET2
7
V6
8
IN67 (IN6)
9
V7 (N.C.)
10
V2
EXPOSED PAD (EP)
20 V8
19 AGND
18 IN
17 IN8
MR
V3
Simplified Functional Diagram
MAIN BATTERY
TOP VIEW
LX3
LBF
IN
MAX8660
LBR
LBF
V1
VCC_IO: (PIN PROG)
3.3V/3.0V/2.85V AT 1.2A
VCC_MEM: (PIN PROG)
1.8V/2.5V/3.3V AT 0.9A
VCC_APPS: (I
2
C PROG)
0.725V TO 1.8V, DVM AT 1.6A
VCC_SRAM: (I
2
C PROG)
0.725V TO 1.8V, DVM AT 0.4A
VCC_MVT: (I
2
C PROG)
1.7V TO 2.0V AT 200mA
VCC_CARD1: (I
2
C PROG)
1.8V TO 3.3V AT 500mA
VCC_CARD2: (I
2
C PROG)
1.8V TO 3.3V AT 500mA
VCC_BBATT:
3.3V ALWAYS ON AT 30mA
V2
V3
V4
MAX8660ETL+
MAX8660AETL+
MAX8660BETL+
MAX8661ETL+
16 PG2
15 LX2
14 PV2
13 LBO
12 SDA
11 SCL
nBATT_FAULT
nRESET
LBO
RSO
MR
V5
V6
V7
V8
I
2
C
INTERFACE
SYS_EN
PWR_EN
SCL
SDA
EN1,2,5
EN34
THIN QFN
5mm x 5mm x 0.8mm
( ) ARE FOR THE MAX8661
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
High-Efficiency, Low-I
Q
, PMICs with Dynamic
Voltage Management for Mobile Applications
MAX8660/MAX8660A/MAX8660B/MAX8661
Table of Contents
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Simplified Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Maxim vs. Marvell PXA3xx Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Step-Down DC-DC Converters (REG1–REG4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
REG1 (VCC_IO) Step-Down DC-DC Converter (MAX8660 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
REG2 (VCC_IO, VCC_MEM) Step-Down DC-DC Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
REG3 (VCC_APPS) Step-Down DC-DC Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
REG4 (VCC_SRAM) Step-Down DC-DC Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
REG1–REG4 Step-Down DC-DC Converter Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
REG1–REG4 Synchronous Rectification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
REG1/REG2 100% Duty-Cycle Operation (Dropout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Linear Regulators (REG5–REG8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
REG5 (VCC_MVT, VCC_BG, VCC_OSC13M, VCC_PLL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
REG6/REG7 (VCC_CARD1, VCC_CARD2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
REG8 (VCC_BBATT) Always-On Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ramp-Rate Control (RAMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Power Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Enable Signals (EN_, PWR_EN, SYS_EN, I
2
C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
REG3/REG4 Enable (EN34, EN3, EN4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Power-Up and Power-Down Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Marvell PXA3xx Power Configuration Register (PCFR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Voltage Monitors, Reset, and Undervoltage-Lockout Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Undervoltage and Overvoltage Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Reset Output (RSO) and
MR
Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Low-Battery Detector (LBO, LBF, LBR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Internal Off-Discharge Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Thermal-Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
I
2
C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Data Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
START and STOP Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Acknowledge Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Slave Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
I
2
C Write Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2
High-Efficiency, Low-I
Q
, PMICs with Dynamic
Voltage Management for Mobile Applications
MAX8660/MAX8660A/MAX8660B/MAX8661
Table of Contents (continued)
Design Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Setting the Output Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Inductor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Input Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Output Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Step-Down Converter Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
PCB Layout and Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Package Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Chip Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Tables
Table 1. Maxim and Marvell PXA3xx Power Domain Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 2. Maxim and Marvell PXA3xx Digital Signal Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 3. SET1 Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 4. SET2 Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 5. Enable Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 6. Truth Table for V3/V4 Enable Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 7. Power Modes and Corresponding Quiescent Operating Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 8. Internal Off-Discharge Resistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 9. I
2
C Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 10. DVM Voltage Change Register (VCC1, 0x20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Table 11. Serial Codes for V3 (VCC_APPS) and V4 (VCC_SRAM) Output Voltages. . . . . . . . . . . . . . . . . . . . . . 37
Table 12. Serial Codes for V5 Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 13. Serial Codes for V6 and V7 Output Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figures
Figure 1. Example MAX8660 Connection to Marvell PXA3xx Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 2. Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 3. Typical Applications Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 4. Soft-Start and Voltage-Change Ramp Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 5. V3/V4 Enable Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 6. Power-Up Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 7. Low-Battery Detector Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 8. START and STOP Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 9. Acknowledge Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 10. Slave Address Byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Figure 11. Writing to the MAX8660/MAX8661 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Figure 12. Step-Down Converter Maximum Output Current Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
3
High-Efficiency, Low-I
Q
, PMICs with Dynamic
Voltage Management for Mobile Applications
MAX8660/MAX8660A/MAX8660B/MAX8661
ABSOLUTE MAXIMUM RATINGS
IN, IN5, IN6, IN67, EN2, EN34, EN5,
LBO, RSO, MR,
SET1,
SET2, V1, V2, V3, V4, SCL, SDA,
SRAD to AGND..................................................-0.3V to +7.5V
LBF, LBR, EN1, RAMP to AGND .................-0.3V to (V
IN
+ 0.3V)
V8 to AGND................................................-0.3V to (V
IN8
+ 0.3V)
V5 to AGND................................................-0.3V to (V
IN5
+ 0.3V)
V6, V7 to AGND........................................-0.3V to (V
IN67
+ 0.3V)
PV1 to PG1 ............................................................-0.3V to +7.5V
PV2 to PG2 ............................................................-0.3V to +7.5V
PV3 to PG3 ............................................................-0.3V to +7.5V
PV4 to PG4 ............................................................-0.3V to +7.5V
PV, PV1, PV2, PV3, PV4, IN8 to IN ........................-0.3V to +0.3V
LX1 Continuous RMS Current (Note 1) .................................2.3A
LX2 Continuous RMS Current (Note 1) .................................2.0A
LX3 Continuous RMS Current (Note 1) .................................2.6A
LX4 Continuous RMS Current (Note 1) .................................1.0A
PG1, PG2, PG3, PG4, EP to AGND.......................-0.6V to +0.6V
GND to AGND ......................................................-0.3V to +0.3V
All REGx Output Short-Circuit Duration......................Continuous
Continuous Power Dissipation (T
A
= +70°C)
40-Pin Thin QFN (derate 35.7mW/°C above +70°C).....2857mW
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
Soldering Temperature (reflow) .......................................+260°C
Note 1:
LX_ has internal clamp diodes to PG_ and PV_. Applications that forward bias these diodes must take care not to exceed
the IC’s package power-dissipation limits.
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
IN
= V
IN5
= V
IN67
= V
IN8
= 3.6V, Figure 3, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
PV1, PV2, PV3, PV4, IN, IN8
Supply Voltage Range
IN Undervoltage-Lockout
Threshold
IN Overvoltage-Lockout
Threshold
SYMBOL
V
IN
V
UVLO
V
OVLO
CONDITIONS
PV1, PV2, PV3, PV4, IN, and IN8 must be
connected together externally
V
IN
rising
V
IN
falling
V
IN
rising
V
IN
falling
Only V8 on (deep-sleep
power mode)
V1, V2, and V8 on;
V1 and V2 in normal (skip)
operating mode
V1, V2, V5, and V8 on
(sleep power mode);
V1 and V2 in normal (skip)
operating mode
V1, V2, V3, V4, V5, and V8 on
(run power mode);
V1, V2, V3, and V4 in normal
(skip) operating mode
V1, V2, V3, V4, V5, V6, V7,
and V8 (all on);
V1, V2, V3, and V4 in normal
(skip) operating mode
Undervoltage lockout, V
IN
= 2.2V
Overvoltage lockout, V
IN
= 6.5V
MIN
2.6
2.250
2.200
6.20
6.00
2.400
2.350
6.35
6.15
20
TYP
MAX
6.0
2.550
2.525
6.50
6.30
UNITS
V
V
V
50
90
Input Current
I
IN
+ I
PV1
+
I
PV2
+ I
PV3
+
I
PV4
+ I
IN5
+
I
IN67
+ I
IN8
No load;
SDA = SCL = V8
µA
140
250
1.5
25
4
High-Efficiency, Low-I
Q
, PMICs with Dynamic
Voltage Management for Mobile Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
IN5
= V
IN67
= V
IN8
= 3.6V, Figure 3, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
PWM Switching Frequency
SYMBOL
f
SW
SET1 = IN, V
PV1
= 4.2V, load = 600mA
V1 Voltage
Accuracy (MAX8860/MAX8860B)
V1
SET1 not connected, V
PV1
= 3.6V,
load = 600mA
SET1 = AGND, V
PV1
= 3.6V, load = 600mA
SET1 = IN, V
PV1
= 4.2V, load = 600mA
V1 Voltage Accuracy (MAX8660A)
V1
SET1 not connected, V
PV1
= 3.6V,
load = 600mA
SET1 = AGND, V
PV1
= 3.6V, load = 600mA
V1 Load Regulation
V1 Line Regulation
SET1 Input Leakage Current
V1 Dropout Voltage
p-Channel On-Resistance
n-Channel On-Resistance
p-Channel Current-Limit
Threshold
n-Channel Zero-Crossing
Threshold
n-Channel Negative Current Limit
REG1 Maximum Output Current
V1 Bias Current
LX1 Leakage Current
Soft-Start Ramp Rate
(MAX8660/MAX8860B)
Soft-Start Ramp Rate
(MAX8660A)
V5 to V1 Enable Time
Internal Off-Discharge Resistance
Minimum Duty Cycle
Maximum Duty Cycle
Forced-PWM mode only, min duty cycle in
skip mode is 0%
t
VMHVSH1
V
PV1
= 6V, LX1 =
PG1 or PV1,
V
EN1
= 0V
T
A
= +25°C
T
A
= +85°C
5
3
-2
I
OUT1
Forced-PWM mode only
2.6V
≤
V
PV1
≤
6V (Note 5)
1.2
5
±0.03
±0.2
7
5
350
650
16.7
100
9
7
+2
µA
R
P1
R
N1
I
LIM1
1.5
Load = 800mA (Notes 3, 4)
Load = 1200mA (Notes 3, 4)
Load = 0 to 1200mA
CONDITIONS
MIN
1.9
3.250
2.955
2.807
2.463
1.970
1.773
TYP
2.0
3.300
3.000
2.850
2.500
2.000
1.800
-1.5
0.15
0.01
150
200
0.12
0.15
1.8
25
-975
2.2
MAX
2.1
3.350
3.045
2.893
2.538
2.030
1.827
%/A
%/V
µA
mV
Ω
Ω
A
mA
mA
A
µA
V
V
UNITS
MHz
MAX8660/MAX8660A/MAX8660B/MAX8661
REG1—SYNCHRONOUS STEP-DOWN DC-DC CONVERTER (MAX8660, MAX8660A, MAX8660B only)
To V1 = 3.3V (total ramp time is 450µs for
all V1 output voltages)
To V1 = 2.5V (total ramp time is 450µs for
all V1 output voltages)
Figure 6
mV/µs
mV/µs
µs
Ω
%
%
5
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