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MAX1692EUB

P1-P3P4-P6P7-P9P10-P12
1.74
1.76
1.80
1.78
1.82
1.84
0 400300200100 500 600 700 800 900
OUTPUT VOLTAGE vs.
LOAD CURRENT
MAX1692-10
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
V
IN
= 2.7V
V
OUT
= 1.8V
R1 = 138kΩ
R2 = 301kΩ
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
4 _______________________________________________________________________________________
0
200
100
400
300
500
600
0 300 450150 600 750 900
DROPOUT VOLTAGE vs.
LOAD CURRENT
MAX1692-01
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
V
OUT
= 2.5V
V
OUT
= 3.3V
95
50
1 100010010
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
65
55
85
75
100
70
60
90
80
MAX1692-02
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5.0V
V
IN
= 3.6V
LIM = IN
R1 = 505kΩ
R2 = 301kΩ
95
50
1 100010010
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 2.5V)
65
55
85
75
100
70
60
90
80
MAX1692-03
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5.0V
V
IN
= 2.7V
V
IN
= 3.6V
LIM = IN
R1 = 309kΩ
R2 = 301kΩ
0
1.5
1.0
0.5
2.5
2.0
4.5
4.0
3.5
3.0
5.0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
BATTERY INPUT CURRENT vs.
INPUT VOLTAGE
MAX1692-07
INPUT VOLTAGE (V)
BATTERY INPUT CURRENT (mA)
SYNC/PWM = IN
V
OUT
= 3.3V
V
OUT
= 1.8V
V
OUT
= 2.5V
1.2
1.21
1.205
1.225
1.22
1.215
1.245
1.24
1.235
1.23
1.25
0 300100 200 400 500 600 700 800 900 1000
FEEDBACK VOLTAGE
vs. LOAD CURRENT
MAX1692-05
LOAD CURRENT (mA)
FB VOLTAGE (V)
V
IN
= 5.0V
R1 = 309kΩ
R2 = 301kΩ
SYNC/PWM = GND
LIM = IN
LIM = GND
60
70
65
80
75
95
90
85
100
2.7 3.53.1 3.9 4.3 4.7 5.1 5.5
BATTERY INPUT CURRENT vs.
INPUT VOLTAGE
MAX1692-06
INPUT VOLTAGE (V)
BATTERY INPUT CURRENT (µA)
V
OUT
= 1.8V
SYNC/PWM = GND
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
1.0
1.5
2.0
2.5
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
BATTERY INPUT CURRENT vs. INPUT
VOLTAGE AND TEMPERATURE
MAX1692-09
INPUT VOLTAGE (V)
BATTERY INPUT CURRENT (mA)
V
OUT
= 1.8V
SYNC/PWM = IN
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
Typical Operating Characteristics
(SYNC/PWM = GND, circuit of Figure 2, L = Sumida CD43-100, T
A
= +25°C, unless otherwise noted.)
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
_______________________________________________________________________________________
5
600
650
700
750
800
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
MAX1692-11
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
I
OUT
= 200mA
2.7 3.9 4.33.1 3.5 4.7 5.1 5.5
0.5
0.8
1.1
1.4
2.7 3.9 4.33.1 3.5 4.7 5.1 5.5
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
MAX1692-12
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (A)
V
OUT
= 1.8V
LIM = IN
LIM = GND
500µs/div
LOAD-TRANSIENT RESPONSE
V
LX
5V/div
V
OUT
AC-COUPLED
100mV/div
I
OUT
2.5A/div
MAX1692-17
I
LOAD
= 30mA to 700mA
2ms/div
START-UP FROM SHUTDOWN
V
SHDN
2V/div
I
IN
0.5A/div
V
OUT
1V/div
MAX1692-14
2ms/div
HEAVY LOAD SWITCHING WAVEFORMS
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 700mA
V
LX
5V/div
I
LX
0.5A/div
V
OUT
AC-
COUPLED
100mV/div
MAX1692-15
2ms/div
LINE-TRANSIENT RESPONSE
V
IN
= 3V to 5V, I
OUT
= 300mA
V
IN
AC-
COUPLED
2V/div
V
OUT
AC-
COUPLED
50mV/div
MAX1692-18
2ms/div
RECOVERY FROM 100% DUTY CYCLE
V
IN
= 3.3V to 4.5V , V
OUT
= 3.3V, I
OUT
= 500mA
V
IN
2V/div
V
LX
5V/div
V
OUT
AC-
COUPLED
500mV/div
MAX1692-19
Typical Operating Characteristics (continued)
(SYNC/PWM = GND, T
A
= +25°C, unless otherwise noted.)
100kHz 1MHz 10MHz
SWITCHING HARMONICS AND NOISE
1mV/div
MAX1692-22
1ms/div
I
OUT
= 500mA
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
6 _______________________________________________________________________________________
NAME FUNCTION
1 IN Supply Voltage Input. Input range from +2.7V to +5.5V. Bypass with a 10µF capacitor.
2 BP
Supply Bypass Pin. Internally connected to IN. Bypass with a 0.1µF capacitor. Do not connect to an
external power source other than IN.
PIN
3 GND Ground
4 REF
1.25V, 1.2% Reference Output. Capable of delivering 50µA to external loads. Bypass with a 0.22µF capaci-
tor to GND.
8
SHDN
Active-Low, Shutdown-Control Input. Reduces quiescent current to 0.1µA. In shutdown, output becomes
high impedance.
7
SYNC/
PWM
Oscillator Sync and Low-Noise, Mode-Control Input.
SYNC/PWM = IN (Forced PWM Mode)
SYNC/PWM = GND (PWM/PFM Mode)
An external clock signal connected to this pin allows for LX switching synchronization.
6 LIM Current-Limit Select Input. Connect LIM to GND for 0.6A current limit or LIM to IN for 1.2A current limit.
5 FB Feedback Input
10 PGND Power Ground
9 LX Inductor Connection to the Drains of the Internal Power MOSFETs
Pin Description
PFM CURRENT COMPARATOR
CONTROL AND
DRIVER LOGIC
SLOPE COMPENSATION
PWM
COMPARATOR
NEGLIM
COMPARATOR
5mV IN PFM
ADJ. IN PWM
PGND
0.1X
SENSE FET
SENSE FET
1Ω
LX
IN
P
N
BP
0.1X
1Ω
10Ω
CHIP
SUPPLY
PWM
ON
REF
FB
SYNC/
PWM
PFM
COMPARATOR
OVERVOLTAGE
COMPARATOR
PWM ON
SIGNAL
40mV
FB
REF
REF
FB
12mV
120mV
RAMP
GEN
SYNC
CELL
ON
LIM COMPARATOR
REF
GND
REF
SHDN
MAX1692
Figure 1. Simplified Functional Diagram
P1-P3P4-P6P7-P9P10-P12

MAX1692EUB

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IC REG BUCK ADJ 600MA 10UMAX
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