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MAX1686 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM
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Step-Up DC-DC Converters with
Precise, Adaptive Current Limit for GSM
ELECTRICAL CHARACTERISTICS
(VIN = VON = +3V, VLIM = 1V (MAX1687), VCHG = 1V (MAX1688), VFB = 1.5V, VOUT = 6V, TA = -40°C to +85°C, unless otherwise noted.)
(Note 1)
PARAMETER
Input Voltage Range
Input Undervoltage Lockout
Output Voltage Range
Input Supply Current
Shutdown Delay
Reference Voltage
FB Set Voltage
FB Transconductance
Peak Current
Ripple Current
Sense Resistor
ON Input Low Voltage
ON Input High Voltage
N-Channel On-Resistance
P-Channel On-Resistance
Precharge On-Resistance
SYMBOL
CONDITIONS
IN rising, 1% hysteresis
IIN
ISHDN
TDELAY
VREF
gmFB
IPEAK
IRIPPLE
RSENSE
VIL
VIH
VFB = 1.5V
Shutdown VIN = 4.2V, LX2 connected to LX1,
VOUT = 0, ON = GND
IREF = 0 to 10µA
FB rising, 2% hysteresis
VFB = 1.125V, VOUT = 3V (MAX1688)
VLIM = VCHG = 1V
VLIM = VCHG = 0.65V
VLIM = VCHG = 1V
VIN = 2.7V
VIN = 6V
VIN = 4.2V
VIN = 2.7V
VIN = 2.7V
VIN = 4V, VFB = 0, VOUT = 0
MIN
2.7
2.35
VREF
0.6
1.212
1.20
0.16
0.73
0.44
145
1.8
1.5
TYP
MAX
6
2.65
6
5
UNITS
V
V
V
mA
10
µA
2
1.288
1.30
0.24
0.90
0.57
240
0.18
0.6
ms
V
V
mmho
A
mA
Ω
V
V
0.8
Ω
0.7
Ω
70
Ω
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(VIN = +3.3V, VOUT = 5V, VLIM = 1V, Figures 6b and 7, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. DC LOAD CURRENT
(VOUT = 5.5V)
95
90
VIN = 5V
85
80
VIN = 3.3V
75
VIN = 2.7V
70
65
VIN = 6V
60
0
50 100 150 200 250 300 350
LOAD CURRENT (mA)
EFFICIENCY vs. GSM BURST LOAD
(VOUT = 5.5V)
95
90
VIN = 5V
85
80
VIN = 3.3V
75
VIN = 2.7V
70
65
VIN = 6V
60
0
500 1000 1500 2000 2500 3000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(VIN = 2.7V, VOUT = 3.3V)
100
95
90
85
80
75
70
65
60
0
50 100 150 200 250 300 350
LOAD CURRENT (mA)
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